CN112113481B - A device and method for measuring the geometric shape of dam breach in water tank test - Google Patents
A device and method for measuring the geometric shape of dam breach in water tank test Download PDFInfo
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- CN112113481B CN112113481B CN202011092475.XA CN202011092475A CN112113481B CN 112113481 B CN112113481 B CN 112113481B CN 202011092475 A CN202011092475 A CN 202011092475A CN 112113481 B CN112113481 B CN 112113481B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/004—Measuring arrangements characterised by the use of mechanical techniques for measuring coordinates of points
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
本发明公开了一种水槽试验中用于测量坝体溃口几何形状的装置及方法，包括固定在水槽顶端的滚轮直线导轨，滚轮直线导轨具有两个，分别平行设置在水槽的两侧，且两个滚轮直线导轨的开口相对设置，两个滚轮直线导轨之间设置有圆柱导轨，圆柱导轨上滑动连接有滑块，且滑块能绕圆柱导轨转动，滑块上连接有垂直测杆，垂直测杆的下端伸入水槽中，且伸入长度能够调节，垂直测杆的下端连接有测锤。本发明通过在水槽顶部安装测量工具，仅需在顶部进行操作，便可测量其溃口的几何参数，十分便利；本发明不易受波动水面、浑浊的水体影响；直线导轨属于精密零件，滑动、滚动摩擦系数小，灵敏度高，测量精度得到了很大的提升。
The present invention discloses a device and method for measuring the geometric shape of a dam breach in a water tank test, comprising a roller linear guide fixed on the top of the water tank, two roller linear guides, respectively arranged in parallel on both sides of the water tank, and the openings of the two roller linear guides are arranged oppositely, a cylindrical guide is arranged between the two roller linear guides, a slider is slidably connected to the cylindrical guide, and the slider can rotate around the cylindrical guide, a vertical measuring rod is connected to the slider, the lower end of the vertical measuring rod extends into the water tank, and the extension length can be adjusted, and a measuring hammer is connected to the lower end of the vertical measuring rod. The present invention installs a measuring tool on the top of the water tank, and only needs to operate on the top to measure the geometric parameters of the breach, which is very convenient; the present invention is not easily affected by fluctuating water surfaces and turbid water bodies; the linear guide is a precision part, with small sliding and rolling friction coefficients, high sensitivity, and greatly improved measurement accuracy.
Description
Technical Field
The invention relates to the technical field of dam break hydraulic model tests, in particular to a device and a method for measuring the geometric shape of a dam break opening in a water tank test.
Background
In the design and management of hydraulic engineering, it is important to effectively forecast the disaster water flow phenomenon of dam body break in time. At present, a physical model test is an important method for researching the actual problems of the engineering in the water conservancy industry, and can solve the complex actual problems by a similar principle. And a dam break hydraulic model test is carried out in the water tank, so that the dam break process in reality can be simulated and observed. The development of the breach determines the discharge flow rate of the flood discharged from the bottom and the dam body breaking process, which is an important content of the dam breaking research, so that the measurement mode of the geometric dimension of the breach becomes an important problem of the test.
The existing geometric dimension measuring devices mainly fall into two categories: contact measurement and non-contact measurement. The contact type measuring device is provided with ruler type measuring tools, such as a ruler, a vernier caliper, a screw micrometer and the like, has the characteristics of simplicity in operation and higher precision, is easily limited by the size of a measured component and a measuring space, cannot meet corresponding requirements, and has interaction with water flow to generate certain influence on the original flow state and measuring precision of the water flow; the non-contact measuring device is mainly realized by optics, optical sensors and the like, such as theodolites, total stations, AR measuring devices and the like, has the characteristics of high speed, accuracy and small influence by the limitation of measuring space, is easily influenced by measuring ambient temperature, illumination conditions and the like, and can not be measured even.
In the dam-break hydraulic model test process, because the test process is faster and is limited by the measurement space, a tester is difficult to enter the test water tank, and the geometric dimension of a break opening is quickly and effectively measured directly by using a measuring tool; and the measuring object is in turbid water, the optical path passes through solid-liquid-gas three-phase body and is easily influenced by the fluctuating water surface, and the corresponding size is difficult to measure by optical measuring equipment.
Disclosure of Invention
The invention aims to provide a device for measuring the geometric shape of a dam breach in a water tank test, which can measure the geometric size of the breach in a dam-break hydraulic model water tank test, breaks through the limitation of space environment to a certain extent and has the advantages of simple structure, convenient implementation, accurate result and no limitation of space environment.
In order to achieve the above object, the present invention provides the following technical solutions:
The utility model provides a device for measuring dam body breach geometry in basin is experimental, including fixing the gyro wheel linear guide on basin top, gyro wheel linear guide has two, parallel arrangement is in the both sides of basin respectively, and the opening of two gyro wheel linear guide sets up relatively, be provided with cylindrical rail between two gyro wheel linear guide, sliding connection has the slider on the cylindrical rail, and the slider can rotate around cylindrical rail, be connected with perpendicular measuring staff on the slider, the lower extreme of perpendicular measuring staff stretches into in the basin, and stretches into length can be adjusted, the lower extreme of perpendicular measuring staff is connected with the measuring staff.
Specifically, the slide block is of a plate-shaped structure, lantern rings are fixedly arranged on two sides of the slide block, the lantern rings are of a cuboid structure, threaded through holes are formed in the lantern rings, the lantern rings are fixedly arranged on one side of the slide block, the threaded through holes are vertically arranged, and the vertical measuring rod is in threaded connection with the threaded through holes of the lantern rings; the other side of the sliding block is fixedly provided with two lantern rings, the threaded through holes of the two lantern rings are horizontally arranged, the center lines of the threaded through holes of the two lantern rings are coincident, and the cylindrical guide rail is in threaded connection with the threaded through holes of the two lantern rings. The sliding block can rotate and slide on the cylindrical guide rail, and the length of the vertical measuring rod extending into the water tank can be adjusted. The vertical measuring rod can rotate 360 degrees around the cylindrical linear guide rail through the sliding block, axially slide along the cylindrical linear guide rail and axially slide along the lantern ring (vertical measuring rod), and the screw thread wall at the position can be contracted by tightening the positioning nut, so that any angle and any position can be locked, and the flexibility and the practicability of the whole tool are improved.
Further, two lantern rings on the other side of the sliding block are respectively connected with a positioning ring through threads, and the two positioning rings are respectively positioned at one ends of the two lantern rings which are far away from each other; the positioning ring comprises a positioning hollow screw rod and a positioning nut, wherein the positioning hollow screw rod is internally provided with a hollow through hole with the same diameter, the positioning hollow screw rod is provided with two connecting parts, the two connecting parts are of an integrated structure, external threads are formed on the outer surfaces of the two connecting parts, the outer diameter of the first connecting part is smaller than that of the second connecting part, the outer diameter of the first connecting part is equal to the inner diameter of the through hole of the inner thread of the lantern ring, the outer diameters of the two ends of the second connecting part are unequal, one end, close to the first connecting part, is a large end, one end far away from the first connecting part is a small end, the second connecting part is provided with a notch along the length direction, the opening size of the notch is sequentially reduced from the small end to the large end, the cylindrical guide rail stretches into and penetrates out of the positioning hollow screw rod, and the positioning nut is screwed on the second connecting part along the small end.
Further, the cylindrical linear guide rail comprises a cylindrical short guide rail and a cylindrical long guide rail, one end of the cylindrical long guide rail is connected with the roller through the positioning ring, the other end of the cylindrical long guide rail is a threaded end for connecting the cylindrical short guide rail, and the threaded end is connected with the cylindrical short guide rail through the positioning ring; the inside of the short cylinder guide rail is hollow, one end of the short cylinder guide rail is connected with the threaded end of the long cylinder guide rail through a positioning ring, the other end is connected with the roller wheel through the locating ring.
The whole length of the cylindrical linear guide rail can be adjusted by controlling the length of the threaded end of the cylindrical long guide rail on the positioning hollow screw rod, the positioning nut can be screwed down, and the threaded wall at the position is contracted, so that the rigid connection of the positioning ring and the cylindrical long guide rail is realized, and the whole length of the cylindrical linear guide rail can be fixed to adapt to the distance between two roller linear guide rails.
Preferably, the idler wheel comprises a wheel, an axle and a wheel cover, one end of the axle is rigidly connected with the wheel, the other end of the axle is in threaded connection with the wheel cover, the axle is positioned in the positioning hollow screw rod and can rotate freely, the threaded wall at the joint is contracted by screwing the positioning nut, the idler wheel is limited to roll, and the diameter of the wheel cover is larger than the inner diameter of the positioning hollow screw rod and smaller than the outer diameter of the first connecting part of the positioning hollow screw rod. The diameter of the wheel cover is larger than the inner diameter of the positioning hollow screw rod and smaller than the outer diameter of the annular end of the positioning hollow screw rod (the inner diameter of the cylindrical linear guide rail), so that the axial displacement of the roller along the cylindrical linear guide rail can be limited.
Preferably, the lower end of the vertical measuring staff is detachably connected with the measuring hammer. The measuring hammer can be replaced by measuring hammers of other different shapes or other parameter measuring instruments can be installed, so that measurement of specific requirements, such as a flow rate measuring instrument and the like, is facilitated. The diameter design of the vertical measuring rod can be smaller and is less influenced by water flow impact. The weight is of sufficient weight not to be propelled by the water flow.
Preferably, the roller linear guide, the cylindrical linear guide and the vertical measuring rod are all made of stainless steel or aluminum alloy, and all are carved with scale marks.
A method for measuring the geometry of a dam breach comprises the following steps:
1) Firstly, installing roller linear guide rails on two sides of the top of a water tank in parallel, assembling a positioning ring, rollers, a cylindrical short guide rail and a cylindrical long guide rail, adjusting the length of the cylindrical linear guide rail, and arranging the cylindrical linear guide rail between the roller linear guide rails;
2) Moving the sliding block along the Y direction to an XOZ plane where the target point is located, enabling the vertical measuring rod to be in a vertical state through gravity self-locking, screwing positioning rings on the left side and the right side of the sliding block, and fixing the position of the vertical measuring rod on the Y axis and the angle between the cylindrical linear guide rail and the vertical measuring rod;
3) Moving a cylindrical linear guide rail along an X axis, moving a vertical measuring rod up and down along a Z axis, moving a measuring hammer to the position of a measured target point A, recording scale line data of the roller linear guide rail, the cylindrical linear guide rail and the vertical measuring rod, namely, the coordinate of a point A is (X 1,y1,z1), moving the measured target point A to the position A ' after a certain process, and recording data again, namely, the coordinate of A ' is (X 1′,y1′,z1 ');
4) And repeating the operation to obtain the coordinate change of each characteristic point, and calculating the change process of the geometric dimension of the crumple.
And a plurality of cylindrical linear guide rails are arranged between the two roller linear guide rails, and a plurality of sections are synchronously measured.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the measuring tool is arranged at the top of the water tank, so that the geometric parameters of the crumple can be measured only by operating at the top, and the measuring tool is very convenient;
the invention can be suitable for the test environment of the hydraulic model test to a large extent, and is not easily influenced by the water body with fluctuation water surface and turbidity; the linear guide rail belongs to a precise part, has small sliding and rolling friction coefficients, high sensitivity and greatly improves measurement accuracy, and simultaneously enables the measuring hammer to spatially move in X, Y, Z directions, so that the whole device has great flexibility; the measuring hammer and the vertical measuring rod are connected through threads, can be assembled and disassembled, can be replaced by measuring hammers of different shapes or be provided with other parameter measuring instruments for measuring in order to adapt to the variability of the structure in the box and meet the measurement of various parameters, and expands the measurable range and the application range.
Drawings
FIG. 1 is a tool space layout of the present invention;
FIG. 2 is a schematic view of the tool structure of the present invention;
FIG. 3 is a schematic view of the detail structure of the cylindrical linear guide rail in FIG. 2;
FIG. 4 is a schematic diagram of the slider of FIG. 2, wherein 4a is a front view, 4b is a rear view, 4c is a top view, and 4d is a side view;
FIG. 5 is a schematic view of a detail structure of the slider and the positioning ring in FIG. 2;
FIG. 6 is a water tank test layout of a dam-break hydraulic model;
fig. 7 is a diagram of the evolution of the geometry of the crumple opening.
In the figure: the device comprises a roller linear guide rail 1, a cylindrical linear guide rail 2, a cylindrical short guide rail 3, a cylindrical long guide rail 4, a roller 5, a wheel 6, a wheel 7, a wheel shaft 8, a wheel cover 9, a sliding block 10, a lantern ring 11, a vertical measuring rod 12, a measuring hammer 13, a positioning ring 14, a positioning hollow screw rod and a positioning nut 15.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
As shown in fig. 1-4, a device for measuring the geometry of a dam breach in a water tank test is used in a dam-break hydraulic model water tank test and comprises a roller linear guide rail 1, a cylindrical linear guide rail 2, a cylindrical short guide rail 3, a cylindrical long guide rail 4, a roller 5, wheels 6, a wheel shaft 7, a wheel cover 8, a sliding block 9, a lantern ring 10, a vertical measuring rod 11, a measuring hammer 12, a positioning ring 13, a positioning hollow screw 14 and a positioning nut 15.
In this embodiment, the two roller linear guide rails 1 are disposed at two ends of the top of the water tank, and are connected to the cylindrical linear guide rail 2 through the rollers 5, and the two roller linear guide rails are located on the same plane, so that the cylindrical linear guide rail 2 can translate on the plane.
In this embodiment, the cylindrical linear guide rail 2 mainly comprises a cylindrical short guide rail 3, a cylindrical long guide rail 4 and a positioning ring 13.
The inside of the cylindrical short guide rail 3 is hollow, the inner diameter D 2 of the cylindrical short guide rail is equal to the outer diameter D 14' of the annular end of the positioning hollow screw 14, namely, the positioning hollow screw 14 is screwed down to realize the rigid connection between the positioning ring 13 and the cylindrical short guide rail 3;
The diameter D 4 of the threaded end of the long cylindrical guide rail 4 is equal to the inner diameter D 14 of the positioning hollow screw 14, the whole length of the linear cylindrical guide rail 2 can be adjusted by controlling the length of the threaded end of the long cylindrical guide rail 4 on the positioning hollow screw 14, the positioning nut 15 can be screwed, the threaded wall at the position is contracted, and therefore the rigid connection of the positioning ring 13 and the long cylindrical guide rail 4 is realized, the whole length of the linear cylindrical guide rail 2 can be fixed, and the distance between the two roller linear guide rails 1 can be adapted.
In this embodiment, the rollers 5 are disposed in the roller linear guide rails 1 on both sides, and are composed of three parts, namely, a wheel 6, a wheel axle 7 and a wheel cover 8.
The wheels 6 are rigidly connected to the axle 7. The wheel axle 7 is in threaded connection with the wheel cover 8 and can be detached.
The diameter D 7 of the wheel axle 7 is slightly smaller than the inner diameter D 14 of the positioning hollow screw 14, namely, the wheel axle 7 can freely rotate in the positioning hollow screw 14, and the thread wall at the position is contracted by screwing the positioning nut 15, so that the rolling of the roller 5 is limited, and the position of the cylindrical linear guide rail 2 in the roller linear guide rail 1 (X axis) is controlled.
The diameter D 8 of the wheel cover 8 is larger than the inner diameter D 14 of the positioning hollow screw 14 and smaller than the outer diameter D 14 ″ of the first connecting part of the positioning hollow screw 14 (the inner diameter D 2 of the cylindrical linear guide rail 2), so that the axial displacement of the roller 5 along the cylindrical linear guide rail 2 can be limited. The roller 5 is connected with the cylindrical linear guide rail 2 through a positioning ring 13.
In this embodiment, the front and back sides of the slider 9 are collar 10, and the collar 10 is connected with the cylindrical linear guide rail 2 and the vertical measuring rod 11, so that the positioning ring 13 and the collar 10 can be rigidly connected by tightening the positioning hollow screw 14.
The vertical measuring rod 11 can rotate 360 degrees around the cylindrical linear guide rail 2 through the sliding block 9, axially slide along the cylindrical linear guide rail 2 and axially slide along the lantern ring 10 (vertical measuring rod 11), and the screw thread wall at the position can be contracted by tightening the positioning nut 15, so that any angle and any position can be locked, and the flexibility and the practicability of the whole tool are improved.
In this embodiment, the measuring hammer 12 is connected with the vertical measuring rod 11 through threads, and can be detached, and the measuring hammer 12 can be replaced by other measuring hammers 12 with different shapes or other parameter measuring instruments can be installed, so that measurement of specific requirements, such as a flow rate measuring instrument, is facilitated. The vertical measuring rod 11 is designed to be smaller in diameter and less affected by water impact. The weight 12 is of sufficient weight not to be propelled by the water flow.
In this embodiment, the positioning ring 13 mainly comprises a positioning hollow screw 14 and a positioning nut 15, the overall length of the cylindrical linear guide rail 2 can be adjusted by controlling the length of the threaded end of the cylindrical long guide rail 4 on the positioning hollow screw 14, and the positioning ring 13 can be used for fixing the length so as to adapt to the distance between the two roller linear guide rails 1.
The inner diameter D 14 of the positioning hollow screw 14 is equal in length, the inner diameter D 14 of the hollow through hole in the positioning hollow screw is equal to the diameter D 4 of the threaded end of the cylindrical long guide rail 4, slightly larger than the diameter D 7 of the wheel axle 7 and smaller than the diameter D 8 of the wheel cover 8. The connecting part of the positioning hollow screw 14 has an outer diameter D 14' which is equal to the inner diameter D 2 of the cylindrical short guide rail 3, is equal to the inner diameter D 10 of the lantern ring 10, and is larger than the diameter D 8 of the wheel cover 8.
The outer diameter D 15 of the positioning nut 15 and the outer diameter D 14' of the two large ends of the connecting part of the positioning hollow screw 14 are equal to the outer diameter D 2 of the cylindrical short guide rail 3. The inner diameter D 15 of the positioning nut 15 is equal to the outer diameter D 14 of the two small ends of the connecting part of the positioning hollow screw 14, and the positioning nut 15 is screwed down, so that the threaded wall at the position can be contracted, and the displacement and rotation of objects in the wall can be limited.
In this embodiment, the roller linear guide 1, the cylindrical linear guide 2 and the vertical measuring rod 11 are all made of stainless steel or aluminum alloy, and are marked with scales, and all directions have high rigidity, high measurement accuracy, corrosion resistance and difficult damage.
The method for measuring the geometry of the dam breach based on the measurement comprises the following steps:
1) Firstly, the roller linear guide rails 1 are arranged on two sides of the top of the water tank in parallel, after other components are assembled, the length of the cylindrical linear guide rail 2 is adjusted, and the cylindrical linear guide rail is arranged in the roller linear guide rails 1.
2) The sliding block 9 is moved to an XOZ plane where the target point is located along the Y direction, the vertical measuring rod 11 is in a vertical state through gravity self-locking, positioning rings 13 on the left side and the right side of the sliding block are screwed, and the position of the vertical measuring rod 11 (comprising a measuring hammer 12) on the Y axis and the angle between the cylindrical linear guide rail 2 and the vertical measuring rod 11 are fixed.
3) The cylindrical linear guide rail 2 is moved along the X axis, the vertical measuring rod 11 (comprising the measuring hammer 12) is moved up and down along the Z axis, the measuring hammer 12 is moved to the position of the measured target point A, the data of the point A coordinate (X 1,y1,z1) which is positioned on the roller linear guide rail 1, the cylindrical linear guide rail 2 and the vertical measuring rod 11 is recorded, after a certain process, the measured target point A is moved to the position A ', and the data of the point A ' coordinate (X 1′,y1′,z1 ') is recorded again.
4) And repeating the operation to obtain the coordinate change of each characteristic point, and calculating the change process of the geometric dimension of the crumple.
Examples: in a dam break hydraulic model test of an earth-rock dam, the height H=80 cm of the dam body model, the length B=100 cm along the axis of the dam, the width L 0 of the dam crest=50 cm, and the upstream-downstream slope ratio i=1:1.5. And a trapezoid drainage groove is formed in the middle of the dam crest, the width b 0 =5 cm of the bottom of the drainage groove and the depth h 0 =12 cm of the drainage groove, and the slope is i 0 =1:1 in consideration of the slope self-stabilization requirement. Before the test starts, the measuring device is installed according to the operation, and the position of the target point A to be measured is shown as the figure.
Firstly, moving a sliding block 9 along the Y direction, enabling a vertical measuring rod 11 to be positioned on an XOZ plane where a target point A is positioned, enabling the vertical measuring rod 11 to be positioned in the vertical direction through gravity self-locking, screwing positioning rings 13 on the left side and the right side of the sliding block 9, and fixing the position of the vertical measuring rod 11 (comprising a measuring hammer 12) on the Y axis and the angle between the vertical measuring rod 11 and a cylindrical linear guide rail 2;
Then, the cylindrical linear guide rail 2 is moved along the X axis, so that the vertical measuring rod 11 is positioned on the YOZ plane where the target point A is positioned, the positioning ring 13 on the inner side of the roller 5 is screwed, and the vertical measuring rod 11 (comprising the measuring hammer 12) is fixed at the position of the X axis, so that the vertical measuring rod 11 (comprising the measuring hammer 12) can only move up and down along the Z axis;
Finally, the vertical measuring bar 11 (including the measuring hammer 12) is moved up and down along the Z axis, so that the measuring hammer 12 contacts the target point a, and the data a (x 1,y1,z1) respectively located on the roller linear guide 1, the cylindrical linear guide 2, and the vertical measuring bar 11 are read.
The measured coordinates of the point A of the target point are 234.50,35.50,68.00.
After the test starts and the dam body starts to burst, a period of time is passed, the burst opening gradually develops and expands, the point A evolves to the position A ', and the operation is repeated, so that the coordinate of the target point A' is (257.30,28.90,43.10).
Finally, a series of coordinate change processes of the target point can be obtained, namely, the change of the geometric shape of the crumple can be reflected, as shown in fig. 7.
Further, a plurality of devices of the invention are arranged on the same roller linear guide rail 1, so that synchronous measurement can be carried out on a plurality of sections, as shown in fig. 4. For example, to record the change of the top width of the downstream crumple surface in a certain period of time, the cylindrical linear guide rail 2 can be moved to the position of the YOZ section 2 along the X axis and fixed by screwing the positioning ring 13; the vertical measuring rod 11 is in a vertical state through gravity self-locking, the vertical measuring rod 11 is moved along the Z-axis direction, the measuring hammer 12 is just positioned at the top end of the crumple face, and the positioning ring 13 is screwed to lock the height of the measuring hammer 12; moving the sliding block 9 along the Y axis to enable the measuring hammer 12 to touch the left end and the right end of the crumple successively, and rapidly reading and recording the readings carved on the cylindrical linear guide rail 2, wherein the difference between the left end and the right end is the instantaneous top width of the downstream crumple surface; repeating the above operation at the same time intervals, and obtaining a series of data, namely the variation condition of the top width of the downstream crumple surface in the time period.
Further, in order to record the depth change condition of the downstream breach surface within a certain period of time, similar to the operation described above, only the positioning ring 7 is screwed to fix the cylindrical linear guide rail 2 and the sliding block 9, the vertical measuring rod 11 is moved along the Z-axis direction, and the reading is read, so that the depth change condition of the downstream breach surface within the certain period of time can be known.
Further, in order to measure the flow rate change condition of a certain space point, as shown in the YOZ section 1, the flow rate measuring instrument is disassembled from the measuring hammer 12, and the positioning ring 7 is screwed to fix the cylindrical linear guide rail 2, the vertical measuring rod 11 and the sliding block 9, so that the flow rate measuring instrument is positioned at the point, and the flow rate change condition of the space point can be measured.
According to the invention, the measuring tool is arranged at the top of the water tank and the measuring operation is carried out, the water tank does not need to be accessed, the limitation of the space environment is broken through to a certain extent, the operation is simple and convenient, the geometric measuring precision is high, the fixed-point multifunctional measurement can be carried out, and the multi-aspect requirement of the test is met.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications can be made in the location of the facilities without departing from the principles of the present invention, and such modifications should also be considered as being within the scope of the present invention.
The non-illustrated portions referred to in the present invention are the same as or implemented using the prior art.
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| US4495703A (en) * | 1981-11-25 | 1985-01-29 | Mitutoyo Mfg. Co., Ltd. | Coordinate measuring instrument |
| JP3341154B2 (en) * | 1998-10-23 | 2002-11-05 | ダイトーエムイー株式会社 | 3D coordinate measuring machine |
| CN203586993U (en) * | 2013-12-03 | 2014-05-07 | 南车株洲电机有限公司 | spatial positioning device |
| CN203642922U (en) * | 2013-12-05 | 2014-06-11 | 长江水利委员会长江科学院 | Water boundary identification measurement system during river model test |
| CN104482882A (en) * | 2014-12-22 | 2015-04-01 | 河海大学 | Break opening measuring instrument used in overtopping dam break tests and measuring method |
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