JP7274732B2 - Model ship test method, test program and test system - Google Patents

Description

The present invention relates to a model ship test method, test program, and test system.

In the water tank test, a resistance test is performed to determine the wave-making resistance coefficient (Cw), and then a self-propulsion test is performed. At that time, the self-propulsion test will be conducted multiple times with the thrust reduction coefficient (1-t) as the main judgment criterion, and the test point will be more than the planned test point. Where and how much to retry was an experience judgment of the experienced aquaria tester.

Here, in Patent Document 1, the hull shape is indicated by a function, the change amount function indicating the amount of change between the desired hull shape and the reference hull shape is expanded into a polynomial, and each parameter of the polynomial is appropriately set within the design conditions. Set and calculate the value of the change amount function, add the value of the function that indicates the reference hull shape to the calculated value of the change amount function, calculate the desired hull shape, and the thrust of the ship in the calculated hull shape There is disclosed a hull shape determination method for estimating the reduction rate and determining the hull shape corresponding to the minimum thrust reduction rate when each parameter of the polynomial is sequentially changed as the optimum hull shape.
Further, in Patent Document 2, in the self-propulsion test for obtaining the self-propulsion element of the water jet propulsion ship, the self-propulsion test is performed using two or more nozzles with different ejection areas of the water jet propulsion device, From the measured values at the same ship speed and the same pump inlet flow rate ratio obtained from the self-propulsion test, construct two or more equations with the thrust reduction rate and the wake rate as unknowns, and combine the two or more equations. A self-propulsion test method for a waterjet propulsion vessel is disclosed in which the thrust reduction rate and the wake rate are obtained by solving.

Japanese Patent Application Laid-Open No. 2003-104280 JP 2005-224519 A

Patent Documents 1 and 2 do not attempt to efficiently and accurately conduct retests or test densities in water tank tests using model ships.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a model ship test method, a test program, and a test system that contribute to improving the accuracy and efficiency of water tank tests using model ships.

In the model ship test method corresponding to claim 1, the model ship test is conducted rationally, and the variation in the test results of a plurality of specific parameters obtained in the model ship test has a large effect. A common first related parameter is extracted, a relationship between the first related parameter and a second related parameter that causes variations in the test results of the specific parameter is measured in advance, and based on the previously measured measurement result, the Determining a test range for a second related parameter with a large range of variation in one related parameter, and performing or repeating the test to obtain multiple specific parameters in the test range with additional test points and a higher test density It is characterized by performing
According to the first aspect of the present invention, a test can be performed based on a test plan that estimates a range in which the test results of a specific parameter are likely to vary, thereby improving the accuracy and efficiency of the test. In addition, based on the first related parameter, which is the common main cause of variation in the test results of a plurality of specific parameters, the range of the second related parameter that is highly likely to cause variation in the test results of the specific parameter is grasped in advance. , necessary points and required scores can be planned based on the relationship between the specific parameter and the second related parameter, and the test can be performed, thereby further improving the accuracy and efficiency of the test. In addition, since the range in which the test results of the specific parameter are expected to vary can be focused on, the accuracy and efficiency of the test are further improved.

The present invention according to claim 2 is characterized in that the pre-measurement takes into account the rate of change of the second related parameter with respect to the first related parameter or the deviation from the curve approximation value.
According to the second aspect of the present invention, the range in which the test results of the specific parameter are expected to vary can be accurately calculated.

In the present invention according to claim 3 , the specific parameters are the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t), the first related parameter is the resistance value (R _T ), and the second related parameter is The parameter is ship speed (Vs).
According to the present invention according to claim 3 , based on the relationship of variation with respect to the resistance value (R _T ) of the first related parameter of the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t),
The range of ship speed (Vs) that is likely to cause variations in the test results of specific parameters can be grasped in advance, and the test can be conducted after planning the necessary points and required points. Efficiency is further improved.

In the model ship test method corresponding to claim 4 , the model ship test is performed rationally, and the specific parameter obtained in the model ship test is a related parameter that greatly affects the variation in the test results. and determine the range with a large rate of change of the specific parameter with respect to the relevant parameter as the test range of the relevant parameter based on the variation of the specific parameter estimated by computer simulation or model ship hull form, and in the test range, the specific parameter When the rate of change or the deviation from the curve approximation value is large , test points are added to increase the test density and the test is performed or the test is performed repeatedly.
According to the present invention of claim 4 , the range of related parameters in which the test results of the specific parameters are likely to vary is grasped in advance, and the test is performed based on the test plan that plans the necessary points and the necessary points. can be performed, the accuracy and efficiency of the test are further improved. In addition, the range in which the test results of the specific parameters are expected to vary can be calculated with high accuracy and the test can be conducted intensively, thereby further improving the accuracy and efficiency of the test.

The present invention according to claim 5 is characterized in that a test point in the related parameter test is set in a range in which the rate of change of the specific parameter is zero.
According to the fifth aspect of the present invention, it is possible to efficiently and accurately calculate the range in which the test results of the specific parameter are expected to vary.

The present invention according to claim 6 is characterized in that the specific parameter is the wave-making resistance coefficient (Cw) and the related parameter is the boat speed (Vs).
According to the sixth aspect of the present invention, there is a possibility that the test results of the wave-making resistance coefficient (Cw) will vary based on the relationship between the ship speed (Vs) and the variation of the wave-making resistance coefficient (Cw). Since the high range can be grasped in advance and the test can be conducted after planning the necessary points and the necessary points, the accuracy and efficiency of the test are further improved.

In a model ship test program corresponding to claim 7 , a specific parameter obtaining step of obtaining a specific parameter to be obtained in a model ship test input to the computer, and A related parameter extracting step of extracting related parameters, and a test range for determining the range in which the variation of the specific parameter grasped in advance is determined as the test range of the related parameters, and the test to obtain the specific parameters in the test range are performed by adding test points and increasing the test density. It is characterized by executing a test-related parameter setting step of setting a related parameter to be performed at a higher level or to be repeatedly performed as a test-related parameter, and an output step of outputting the set test-related parameter.
According to the seventh aspect of the present invention, the test can be performed based on the test-related parameters set by estimating the range in which the test results of the specific parameters are highly likely to vary.

The present invention according to claim 8 is characterized by further comprising an automatic operation step of automatically operating a test system for testing the model ship according to the test-related parameters set in the test-related parameter setting step.
According to the present invention as set forth in claim 8 , by automating the test system that is set in consideration of the range in which the test-related parameters cause variations in the specific parameters, the efficiency of the water tank test can be improved. burden can be reduced.

According to the ninth aspect of the present invention, in the related parameter extraction step , input related parameters are accepted.
According to the invention as defined in claim 9 , tests can be performed with any relevant parameter.
Note that the external input may be a manual input of a predetermined related parameter.

A model ship testing system corresponding to claim 10 is characterized by comprising a model ship, a test water tank, and testing means, and performing a model ship testing method.
According to the tenth aspect of the present invention, since the test can be performed based on the test plan in which the range in which the test results of the specific parameters are likely to vary is highly likely, the accuracy and efficiency of the test are improved.

A model ship test system corresponding to claim 11 comprises a model ship, a test water tank, and test means, and is characterized by being automatically operated by a model ship test program.
According to the present invention according to claim 11 , the efficiency can be improved and the accuracy can be improved by automatically performing the test based on the test plan that estimates the range where the test results of the specific parameter are likely to vary. A high degree of automatic testing can be realized.

According to the model ship testing method of the present invention, the test can be performed based on a test plan in which the range in which the test results of the specific parameters are highly likely to vary is estimated, so the accuracy and efficiency of the test are improved. In addition, based on the first related parameter, which is the common main cause of variation in the test results of a plurality of specific parameters, the range of the second related parameter that is highly likely to cause variation in the test results of the specific parameter is grasped in advance. , necessary points and required scores can be planned based on the relationship between the specific parameter and the second related parameter, and the test can be performed, thereby further improving the accuracy and efficiency of the test. In addition, since the range in which the test results of the specific parameter are expected to vary can be focused on, the accuracy and efficiency of the test are further improved.

Also , when measuring in advance, it is expected that the test results of the specific parameter will vary when measuring in consideration of the deviation from the change rate of the second related parameter with respect to the first related parameter or the curve approximation value. It is possible to accurately calculate the range to be covered accurately.

Further, the specific parameters are the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t), the first related parameter is the resistance value (R _T ), and the second related parameter is the ship speed (Vs). , the variation in the test results of the specific parameter based on the relationship between the resistance value (R _T ) of the first related parameter of the wave resistance coefficient (Cw) and the thrust reduction coefficient (1-t) It is possible to grasp the range of ship speed (Vs) where there is a high possibility of occurrence of failure in advance and plan the necessary points and necessary points before conducting the test, further improving the accuracy and efficiency of the test.

In addition, according to the model ship testing method of the present invention, the model ship test is performed rationally, and the related parameters that have a large influence on the variation of the test results of the specific parameter obtained in the model ship test are determined. Then, the range with a large rate of change of the specific parameter with respect to the relevant parameter is determined as the test range of the relevant parameter based on the variation of the specific parameter estimated by computer simulation or the hull form of the model ship, and the change of the specific parameter in the test range If the deviation from the rate or curve approximation is large, it is likely that test results for a particular parameter will vary due to additional test points and higher test densities or repeated tests. The range of relevant parameters can be grasped in advance, and the test can be conducted based on the test plan that plans the necessary points and the necessary points, so that the accuracy and efficiency of the test are further improved. In addition, the range in which the test results of the specific parameters are expected to vary can be calculated with high accuracy and the test can be conducted intensively, thereby further improving the accuracy and efficiency of the test.

In addition , when setting the test points in the related parameter test in the range where the rate of change of the specific parameter is zero, the range in which the test results of the specific parameter are expected to vary is calculated efficiently and accurately. be able to.

Further, when the specific parameter is the wave-making resistance coefficient (Cw) and the related parameter is the ship speed (Vs), based on the relationship between the ship speed (Vs) and the variation of the wave-making resistance coefficient (Cw), It is possible to grasp in advance the range where there is a high possibility of variation in the test results of the wave resistance coefficient (Cw) and plan the necessary points and the necessary points before conducting the test, so the accuracy and efficiency of the test is further improved.

Further, according to the model ship test program of the present invention, the test can be conducted based on the test-related parameters set by estimating the range in which the test results of the specific parameters are highly likely to vary.

In addition, if the test-related parameter set in the test-related parameter setting step is further provided with an automatic operation step for automatically operating the test system for testing the model ship, the range in which the test-related parameter causes the variation of the specific parameter By automating the test system that has been set up in consideration of the above, the efficiency of tank tests can be improved and the burden on tank testers can be reduced.

Further, in the related parameter extraction step, when externally input related parameters are accepted, the test can be performed using any related parameters.

In addition, according to the model ship testing system of the present invention, the test can be performed based on the test plan that estimates the range where the test results of the specific parameters are likely to vary, so the accuracy and efficiency of the test are improved. do.

In addition, according to the model ship testing system of the present invention, efficiency can be improved by automatically conducting a test based on a test plan that estimates the range in which the test results of specific parameters are highly likely to vary. , high-precision automatic testing can be realized.

Correlation diagram of wave-making resistance coefficient and thrust reduction coefficient in an example of the embodiment of the present invention Diagram showing an example of tank test results for ship speed and wave-making drag coefficient Figure showing the same wave resistance curve Schematic diagram of integrated bow shape

A model ship test method, test program, and test system according to embodiments of the present invention will be described below.
The following includes not only tests in calm water but also tests in waves.

FIG. 1 is a correlation diagram of a wave-making resistance coefficient (Cw) and a thrust reduction coefficient (1-t) in one example. In the upper diagram of FIG. 1, the vertical axis represents the wave-making resistance coefficient (Cw), and the horizontal axis represents the ship speed (Froude number (Fr)). In the lower diagram of FIG. 1, the vertical axis is the thrust reduction coefficient (1-t), and the horizontal axis is the ship speed (Froude number (Fr)).
The relationship between Froude number (Fr) and ship speed (Vs) is Fr=Vs/√Lg (L: captain, g: gravitational acceleration). (Vs) is in a proportional relationship.
As shown in FIG. 1, the thrust reduction coefficient (1-t) is stable with respect to the ship speed (Froude number (Fr)) (usually, variation with first-order approximation is small). However, in the case of a test that requires retry, the thrust reduction coefficient (1-t) also varies in the speed range where the wave resistance coefficient (Cw) obtained in the resistance test varies. That is, the data of the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t) have the same range of variation.
Therefore, in the present embodiment, as described below, a test (self-propulsion test) plan is created by focusing on the speed range in which the wave-making drag coefficient (Cw) varies. Or, within that range, conduct a re-test in addition to the initial plan.
As a result, a tank test with a required number of points can be performed at a required location, so that a highly accurate tank test can be realized and the tank test can be automated.
Conversely, as a water tank test analysis method, it is also possible to create an interpolation curve for the wave resistance coefficient (Cw) so that the thrust reduction coefficient (1-t) is stabilized.

A model ship test system according to an embodiment of the present invention includes a model ship, a test water tank in which the model ship is run or towed, and test means such as towing means and measuring equipment used in conducting the water tank test. Illustrations of these model ships, test tanks, and test means are omitted.
The test system shall apply a test method that rationally tests model ships. First, a common first related parameter having a large influence on variations constituting a plurality of specific parameters is extracted. The plurality of specific parameters include a wave-making drag coefficient (Cw) and a thrust reduction coefficient (1-t). A first related parameter is a resistance value ( _RT ) [N] measured in a resistance test in a water tank test using a model ship.
After extracting the resistance value (R _T ), which is the first relevant parameter, the relationship between the first relevant parameter and the second relevant parameter is pre-measured. A second relevant parameter is the model ship's speed (Vs).
Then, based on the measurement results obtained in advance, a test (self-propulsion test) is planned and performed for the relationship between the specific parameter and the second related parameter.
In this way, by extracting the related parameters that have a large effect on the variation in the test results of the specific parameters obtained in the model ship test, and considering the related parameters within the range that causes the variation, the tank test is planned and carried out. Tank tests can be conducted based on a test plan that estimates the range of likely variations in test results for parameters. Also, based on the first related parameter that is the common main cause of the variation in the test results of the plurality of specific parameters, grasping in advance the second related parameter range where there is a high possibility that the test results of the specific parameter will vary, The accuracy and efficiency of the test are further improved by conducting the test after planning the required locations and required scores based on the relationship between the specific parameter and the second related parameter.

At this time, based on the measurement results measured in advance, determine the test range of the second related parameter (vessel speed (Vs)) in the range where the first related parameter (resistance value (R _T )) varies greatly, It is preferable to conduct tests closely or repeatedly to obtain a plurality of specific parameters (wave resistance coefficient (Cw), thrust reduction coefficient (1-t)) within the test range. As a result, the range in which the test results of the specific parameters are expected to vary can be tested with emphasis, thereby further improving the accuracy and efficiency of the test.
Also, in measuring the relationship between the first related parameter and the second related parameter in advance, the change in the second related parameter (vessel speed (Vs)) with respect to the first related parameter (resistance value ( _RT )) It is preferable to take into account deviations from rate or curve approximation. As a result, the range in which the test results of the specific parameter are expected to vary can be accurately calculated.
Further, the specific parameters are the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t), the first related parameter is the resistance value (R _T ), and the second related parameter is the ship speed (Vs). By doing so, based on the relationship between the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t) and the ship speed (Vs), the range where there is a high possibility that the test results of specific parameters will vary is determined in advance. Since the test can be conducted after grasping and planning the necessary points and necessary points, the accuracy and efficiency of the test are further improved.

Here, as shown in Fig. 1, the reason why the fluctuation range of the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t) match (similar) with respect to the ship speed (Vs) will be explained in detail. do.
Regarding the relationship between wave resistance coefficient (Cw), thrust reduction coefficient (1-t) and ship speed (Vs), from the definitions of wave resistance coefficient (Cw) and thrust reduction coefficient (1-t), these two coefficients and ship speed (Vs).
It should be noted that the purpose here is to explain the variability of tank test results with ship speed (Vs). Therefore, we will not discuss two values defined by a constant value that does not vary and a smooth function.

ここで、「Ｒ_Ｔ」は抵抗試験で計測される抵抗値［Ｎ］であり、図１のように水槽試験では船速（Ｖｓ）に対してばらつく値である。また、「ρ」は水又は海水の密度、「Ｓ」は船体の浸水表面積、「１＋ｋ」は形状影響係数、「Ｃ_ＦＭ」は模型船レイノルズ数の相当矩形平板の摩擦抵抗係数であり、いずれもばらつかない値である。 FIG. 2 is a diagram showing an example of tank test results of ship speed (Vs) and wave-making resistance coefficient (Cw), where the horizontal axis is ship speed (here, Froude number (Fr)) and the vertical axis is wave-making resistance. coefficient (Cw).
A wave-making resistance coefficient (Cw) is defined like the following formula (1).

Here, “R _T ” is the resistance value [N] measured in the resistance test, and as shown in FIG. In addition, "ρ" is the density of water or seawater, "S" is the submerged surface area of the hull, "1+k" is the shape influence coefficient, and " _CFM " is the coefficient of frictional resistance of a rectangular flat plate equivalent to the Reynolds number of the model ship. It is a value that does not fluctuate.

ここで、ＳＦＣ＝(１＋ｋ)(Ｃ_ＦＳ－Ｃ_ＦＭ)＋ΔＣ_Ｆであり、ばらつかない値である。また、「Ｒ_Ｔ」は先ほどの抵抗試験で計測される抵抗値［Ｎ］を船速（Ｖｓ）で補間した値を用いる。また、「Ｔ」は自航試験で計測されるプロペラのスラスト［Ｎ］で、船速（Ｖｓ）とプロペラ回転数（ｎ[rpm]）により変化する値である。また、「Ｃ_ＦＳ」は実船レイノルズ数の相当矩形平板の摩擦抵抗係数、「ΔＣ_Ｆ」は実船と模型船との粗度修正係数であり、どちらもばらつかない値である。
水槽試験で計測されるプロペラのスラスト（Ｔ）は、抵抗値（Ｒ_Ｔ）に対して計測値のばらつきが比較的小さく安定的である。そのため、自航試験による推力減少係数（１－ｔ）の計測結果のばらつきの主因は、抵抗試験で計測される抵抗値（Ｒ_Ｔ）であることが多い。
このことから、自航試験の前に行われる抵抗試験において、抵抗値（Ｒ_Ｔ）（すなわち造波抵抗係数（Ｃｗ））の船速（Ｖｓ）に対するばらつきを事前に調べ、造波抵抗係数（Ｃｗ）がバラつく船速（速度）範囲について、自動的に密度の高い試験計画を作成し自動計測を実行することができる。または、この範囲で当初の計画に加えて再試を行うことで、より精度の高い水槽試験が実現できる。 Next, the thrust reduction coefficient (1-t) is defined by the following equation (2).

Here, SFC=(1+k)(C _FS −C _FM )+ΔC _F , which is a constant value. Also, " _RT " uses a value obtained by interpolating the resistance value [N] measured in the previous resistance test with the ship speed (Vs). Further, "T" is the propeller thrust [N] measured in the self-propulsion test, and is a value that varies depending on the ship speed (Vs) and the propeller rotation speed (n [rpm]). Also, "C _FS " is the coefficient of frictional resistance of a rectangular flat plate equivalent to the Reynolds number of the actual ship, and "ΔC _F" is the roughness correction coefficient between the actual ship and the model ship, both of which are values that do not vary.
The thrust (T) of the propeller measured in the water tank test is stable with relatively small variation in the measured value with respect to the resistance value (R _T ). Therefore, the main cause of variations in the measurement results of the thrust reduction coefficient (1-t) in the self-propulsion test is often the resistance value (R _T ) measured in the resistance test.
For this reason, in the resistance test performed before the self-propulsion test, the variation of the resistance value (R _T ) (that is, the wave-making resistance coefficient (Cw)) with respect to the ship speed (Vs) was investigated in advance, and the wave-making resistance coefficient ( In the range of ship speed (velocity) where Cw) varies, a dense test plan can be automatically created and automatic measurement can be executed. Alternatively, by conducting retests in addition to the initial plan within this range, more accurate water tank tests can be achieved.

Next, a model ship testing method according to another embodiment applied to the above-described testing system will be described.
The model ship test method according to the present embodiment identifies a range in which the rate of change of a specific parameter (wave-making resistance coefficient (Cw)) with respect to a related parameter (ship speed (Vs)) is large, and compares the rate of change or the curve approximation value Plan the test to allow for a large range of deviations. As a result, it is possible to grasp in advance the range of related parameters that are likely to cause variations in the test results of specific parameters, and to conduct tests based on a test plan that plans the necessary points and the necessary points. A high water tank test can be realized.
In addition, based on the variation of the specific parameter (wave-making resistance coefficient (Cw)) estimated by computer simulation or the hull form of the model ship, the test range of the related parameter (ship speed (Vs)) is determined, and the specific parameter It is preferable to conduct tests to obtain (thrust reduction coefficient (1-t)) closely or repeatedly. As a result, the range in which the test results of the specific parameter are expected to vary can be calculated with high accuracy, and the test can be conducted intensively, thereby further improving the accuracy and efficiency of the test.
Moreover, it is preferable to set a test point in the test of the related parameter (vessel speed (Vs)) in a range where the rate of change of the specific parameter (wave-making resistance coefficient (Cw)) is zero. This makes it possible to efficiently and accurately calculate the range in which the test results of the specific parameter are expected to vary.
Further, the specific parameters are the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t), the first related parameter is the resistance value (R _T ), and the second related parameter is the ship speed (Vs). By doing so, based on the relationship of the variation of the wave-making drag coefficient to the ship speed (Vs), the range where the test results of the wave-making drag coefficient (Cw) are likely to vary is grasped in advance, and the necessary points and Since the test can be conducted after planning the required score, the accuracy and efficiency of the test are further improved.

Here, a high-precision measurement method for the wave-making resistance coefficient (Cw) will be described.
FIG. 3 is a diagram showing an example of a wave resistance curve.
First, as the zero stage, a wave-making resistance curve is estimated by computer simulation, and is shown as in FIG. The positions of humps (mountains) and hollows (valleys) are specified from FIG. It should be noted that this zero stage can be omitted.
Then, as a first step, roughly test points are taken (see FIG. 1).
Next, as the second step, the wave-making drag coefficients (Cw1, Cw2) are measured at two points (Fr±Δ) before and after the ship speed (Froude number (Fr)) of the test point.
Next, as the third step, calculate the rate of change of the wave-making resistance coefficient (Cw) or the deviation from the curve approximation value, and if this is large, further change the ship speed (Froude number (Fr)) measure. If the rate of change or the deviation from the curve approximation does not converge, add more measurement points. The point here is that the wave resistance coefficient (Cw) is bumpy at the hump and hollow, so the rate of change quickly subsides (turns from positive to negative).
Next, as the fourth step, the horizontal axis is the deviation from the curve approximation value, and the vertical axis is the wave-making resistance coefficient (Cw). Used for self-propulsion analysis.
Next, as the fifth step, the obtained thrust reduction coefficient (1-t) is evaluated for validity. The point here is to change the boat speed (Froude number (Fr)), because the same measurement (retry) will give the same result in unmanned operation. It should be noted that this fifth stage can be omitted.
In this way, it is possible to automatically calculate the measurement points according to the above-described procedure, and realize high-precision measurement that suppresses variations in wave-making resistance (Cw) with respect to ship speed (Froude number (Fr)).

Next, a high-precision measurement method for the wave-making resistance coefficient (Cw) will be described.
Fig. 4 is a schematic diagram of the bow shape of the hull, Fig. 4(a) showing a gooseneck hull form and Fig. 4(b) showing a standard valve hull form.
This method estimates the wave-making resistance curve by computer simulation and shows it as shown in Fig. 3, identifies the positions of the hump and hollow from Fig. 3, and calculates the range in which the wave-making resistance coefficient (Cw) varies. be.
The range of Froude numbers (Fr) for estimating hump-hollow is preferably 0.14<Fr<0.24, more preferably 0.14<Fr<0.20. Note that Fr<0.1 is not necessary.
In addition, as shown in FIG. 4( a ), the gooseneck hull type in which the upper surface of the valve once rises from the top of the tip toward the rear, rises above the water surface, and then descends below the water surface and rises again. Regarding, the variation in the wave resistance coefficient (Cw) is particularly large in the range of 50% to 120% (more preferably 50% to 80%) of the design ship speed, so focusing on these ranges, the wave resistance It is preferable to estimate the variation range of the coefficient (Cw).

The model ship test system described above can also be operated by a test program installed in a computer.
This test program consists of a specific parameter acquisition step for acquiring specific parameters (wave-making resistance coefficient (Cw), thrust reduction coefficient (1-t)) obtained in the input model ship test, and a test result acquisition step for the specific parameters. A related parameter extraction step of extracting related parameters (resistance value ( _RT ), ship speed (Vs)) that have a large influence on variation, and a related parameter to be tested considering the range of variation of the related parameter is a test related parameter ( The computer is caused to execute a test-related parameter setting step for setting the resistance value ( _RT ) and the ship speed (Vs), and an output step for outputting the set test-related parameters. This provides test-related parameters to tank testers and the like.
Further, the test system can be automatically operated by further including an automatic operation step for automatically operating the test system for testing the model ship using the test-related parameters set in the test-related parameter setting step. By automating a test system that is set in consideration of the range in which test-related parameters cause variations in specific parameters, the efficiency of tank tests can be improved and the burden on tank testers can be reduced.
Incidentally, in the related parameter extraction step, related parameters externally input by a tank tester or the like may be received. In this case, testing can be done with any relevant parameter. Alternatively, the external input may be a manual input of predetermined related parameters.
In addition, in the mode for carrying out the invention, an example of a model ship test mainly related to the self-propulsion element of the ship was shown, but other test items related to the test of the model ship, meteorological and sea conditions other than calm water Even with the wind and wave related test parameters considered, it is possible to plan the test considering related parameters that also have a large impact on the variability of the test results for the particular parameter.

The present invention, for example, pays attention to the similarity of the range of variation between the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t) with respect to the ship speed (Vs), and determines whether to retry or measures it. It is applied to the planning and addition method, and can contribute to the improvement of accuracy and efficiency of tank tests using model ships. In addition, in automating tank tests, it can be applied to an automatic retest determination method or an automatic measurement point planning/addition method (which test density is to be tested at a high level).

Cw Wave resistance coefficient 1-t Thrust reduction coefficient Vs (Fr) Vessel speed (Froude number)

Claims (11)

A test method for rationally testing a model ship, comprising: extracting a common first related parameter having a large influence on variations in test results of a plurality of specific parameters obtained in the test of the model ship; Pre-measure the relationship between one related parameter and a second related parameter that causes variation in test results of the specific parameter, and based on the pre-measured measurement result, a large range of change in the first related parameter Determining a test range of the second related parameter of, and performing the test to obtain a plurality of the specific parameters in the test range by adding test points to increase the test density or repeating Test method for model ships. 2. The test of the model ship according to claim 1 , wherein the pre-measurement is performed in consideration of a rate of change of the second related parameter with respect to the first related parameter or a deviation from a curve approximation value. Method. The specific parameters are the wave-making resistance coefficient (Cw) and the thrust reduction coefficient (1-t), the first related parameter is the resistance value (R _T ), and the second related parameter is the ship speed (Vs ), the method for testing a model ship according to claim 1 or 2 . A test method for rationally testing a model ship, wherein a related parameter having a large influence on variations in test results of a specific parameter obtained in the test of the model ship is extracted, and a change in the specific parameter with respect to the related parameter. A range with a large rate is determined as a test range of the relevant parameter based on the variation of the specific parameter estimated by computer simulation or the hull form of the model ship, and in the test range, the change rate or curve of the specific parameter A method of testing a model ship, characterized in that, when the deviation from the approximate value is large, the test is performed by adding test points to increase the test density, or the test is repeated . 5. The method of testing a model ship according to claim 4 , wherein said test point in said test of said related parameter is set to a range in which said rate of change of said specific parameter is zero. 6. A model ship testing method according to claim 4 , wherein said specific parameter is a wave-making resistance coefficient (Cw) and said related parameter is a ship speed (Vs). to the computer,
a specific parameter obtaining step of obtaining a specific parameter to be obtained in the input model ship test;
a related parameter extracting step of extracting a related parameter having a large influence on variation in test results for the specific parameter;
A range that causes the variation of the specific parameter that is grasped in advance is determined as the test range of the related parameter, and the test that obtains the specific parameter in the test range is performed by adding test points and increasing the test density, or a test-related parameter setting step of setting the relevant parameter for repeated execution as a test-related parameter;
and an output step of outputting the set test-related parameters. 8. The model ship according to claim 7 , further comprising an automatic operation step of automatically operating a test system for performing the test of the model ship according to the test-related parameters set in the test-related parameter setting step. exam program. 9. A test program for a model ship according to claim 7 , wherein said related parameter input step receives said related parameter input. A model ship testing system comprising : a model ship; a test water tank; and a test means; A model ship test comprising a model ship, a test water tank, and a test means, and automatically operated by the model ship test program according to claim 8 or claim 9 citing claim 8 . system.

Images