CN105510043B - A kind of marine diesel job stability analysis method and device - Google Patents
A kind of marine diesel job stability analysis method and device Download PDFInfo
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- CN105510043B CN105510043B CN201510844178.9A CN201510844178A CN105510043B CN 105510043 B CN105510043 B CN 105510043B CN 201510844178 A CN201510844178 A CN 201510844178A CN 105510043 B CN105510043 B CN 105510043B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/046—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring revolutions
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Abstract
The present invention relates to a kind of marine diesel job stability analysis method and device, wherein method includes：Diesel engine flash speed signal is obtained by marine diesel transient speed acquisition system, and spectrum analysis is carried out to transient speed signals complete cycle, is obtained 0.5 humorous time, 1 frequency multiplication, 1.5 frequencys multiplication, 2 frequencys multiplication, 2.5 frequencys multiplication, magnitude peak in 3 frequencys multiplication and its adjoint frequency domain.The present invention asks for the unstable ratio under each operating mode of marine diesel according to more order frequency domain amplitude peak values of multigroup transient speed, judges marine diesel job insecurity degree and time of occurrence using unstable ratio.
Description
Technical field
The present invention relates to Diesel Engine Technique Field, more particularly to a kind of marine diesel job stability analysis method and dress
Put.
Background technology
Rotating speed is an important parameter of marine diesel, and marine diesel rotating speed can be subject to diesel engine gas torque, be used to
Property torque and loading moment etc. collective effect, be one of marine diesel operation conditions and comprehensive embody.Transient speed at present
Research with engine transient performance evaluation and not the research of contact measurement technology greatly developed.In multi-cylinder engine
The course of work in, each cylinder does work successively according to firing order, and transient speed is there are regular fluctuation in circulation, wherein accumulateing
The abundant information of reflection internal combustion engines working status is contained.The Instantaneous Speed Fluctuations signal of bent axle can reflect each cylinder of diesel engine
Working status, its operating status and the information of dependent failure can be obtained by analyzing the fluctuation of transient speed.Under normal circumstances, diesel oil
The power performance of each cylinder of machine is basically identical, though each cylinder Instantaneous Speed Fluctuations are variant, always in a little scope, and is in
Certain existing regularity；When diesel engine cylinder causes in-cylinder pressure to reduce because of failure, its power uniformity is destroyed, instantaneous to turn
Fast fluctuation signal will be deformed, and may determine that the quality of diesel engine in-cylinder process accordingly.
At present, judge that diesel engine working status is broadly divided into three classes using transient speed：Waveform Analysis Method, torque estimation method
And combination features method, these three methods all there are it is certain the problem of.Waveform Analysis Method needs to carry out transient speed waveform
Analysis, since transient speed is subject to factor more complicated, Waveform Analysis Method accuracy in practical engineering application is poor, application range
It is limited；Torque estimation method is related to structure parameters in diesel engine, it is necessary to a set of complex kinetic model, and calculation amount is larger,
Therefore it is unfavorable for on-line monitoring and real-time diagnosis；Though combination features method with calculation amount it is small, be not required shafting structure parameter it is excellent
Point, but it will be applied to the problem of how actual presence of engineering establishes reliable fault master pattern.Various master patterns obtain
Experience or many experiments must be relied on, workload is very big, and the species and degree of failure are difficult to simulate.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of marine diesel job stability analysis method, to solve
It is certainly existing to judge that three kinds of method accuracys of diesel engine working status are poor using transient speed, be of limited application, calculation amount compared with
The problem of greatly, it is necessary to by experience or many experiments.
The purpose of the present invention is mainly achieved through the following technical solutions：
The present invention provides a kind of marine diesel job stability analysis method, including：
Transient speed is intercepted according to different operating modes, obtains multigroup transient speed waveform signal under different operating modes；
Spectrum analysis is carried out to the transient speed waveform signal of interception using Fourier transform and obtains transient speed waveform letter
Number frequency domain amplitude spectrum；
Frequency search is carried out respectively to multigroup transient speed waveform signal frequency domain amplitude spectrum of acquisition, is determined in preset range
Frequency domain amplitude peak value；
According to the frequency domain amplitude peak value in preset range, calculate marine diesel job insecurity and compare USR.
Further, further include：
Marine diesel job insecurity is monitored than USR, when more than predetermined threshold, is determined at marine diesel
In job insecurity, record USR is more than the initial time of the predetermined threshold.
Wherein, the predetermined threshold is 12.
Further, interception process specifically includes：
45 groups of transient speed signals are at least intercepted in the range of [600,1000] according to engineering experience rotating speed, [1000,
1500] 60 groups of transient speed signals are at least intercepted in the range of, minimum 80 groups of transient speeds letters of interception in the range of [1500-2500]
Number, 85 groups of transient speed signals when more than 2500.
Further, [0.5f-5%f, 0.5f+5%f] is determined after frequency search, [f-5%f, f+5%f], [1.5f-
5%f, 1.5f-5%f], [2f-5%f, 2f+5%f], [2.5f-5%f, 2.5f+5%f], [3f-5%f, 3f+5%f] scope
Interior frequency domain amplitude, asks for the frequency domain amplitude peak value in given range.
Further, the marine diesel job insecurity ratio is calculated according to equation below：
Wherein,
S1~S6 is respectively the frequency domain amplitude peak value in the range of different frequency,Surveyed when being in normal condition for marine diesel
Multigroup transient speed data are taken to ask for the peak-to-average calculated in the range of different frequency after frequency domain amplitude peak value.
Present invention also offers a kind of marine diesel job stability analytical equipment, including：
Acquisition module, for being intercepted according to different operating modes to transient speed, obtains under different operating modes multigroup instantaneous turn
Fast waveform signal；
Computation analysis module, obtains for carrying out spectrum analysis to the transient speed waveform signal of interception using Fourier transform
Composed to transient speed waveform signal frequency domain amplitude；Multigroup transient speed waveform signal frequency domain amplitude of acquisition is composed respectively into line frequency
Rate is searched for, and determines the frequency domain amplitude peak value in preset range；According to the frequency domain amplitude peak value in preset range, marine diesel oil is calculated
Machine job insecurity compares USR.
Further, further include：
Monitoring modular, for being monitored to marine diesel job insecurity than USR, when more than predetermined threshold, really
Determine marine diesel and be in job insecurity, record USR is more than the initial time of the predetermined threshold.
Further, the acquisition module at least intercepts 45 groups of winks according to engineering experience rotating speed in the range of [600,1000]
When tach signal, in the range of [1000,1500] at least interception 60 groups of transient speed signals, at least cut in the range of [1500-2500]
Take 80 groups of transient speed signals, 85 groups of transient speed signals when more than 2500.
Further, the computation analysis module is specifically used for, the transient speed waveform using Fourier transform to interception
Signal carries out spectrum analysis and obtains transient speed waveform signal frequency domain amplitude spectrum；To multigroup transient speed waveform signal frequency of acquisition
Domain amplitude spectrum carries out frequency search respectively, determines [0.5f-5%f, 0.5f+5%f], [f-5%f, f+5%f], [1.5f-5%
F, 1.5f-5%f], [2f-5%f, 2f+5%f], [2.5f-5%f, 2.5f+5%f], in the range of [3f-5%f, 3f+5%f]
Frequency domain amplitude, ask for the frequency domain amplitude peak value in given range；Then the marine diesel work is calculated according to equation below
Make unstable ratio：
Wherein,
S1~S6 is respectively the frequency domain amplitude peak value in the range of different frequency,Surveyed when being in normal condition for marine diesel
Multigroup transient speed data are taken to ask for the peak-to-average calculated in the range of different frequency after frequency domain amplitude peak value.
The present invention has the beneficial effect that：
The present invention is proposed to can be applied to the detection instable performance characteristic of marine diesel, realized to marine diesel work
Make unstability and carry out qualitative assessment, method proposed by the present invention has calculating simple accurate, and result of calculation, which has, to point clearly to
Property, suitable for all types of marine diesels (arranging machine and V-type machine), independent of experience or many experiments.
Other features and advantages of the present invention will illustrate in the following description, also, partial become from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and obtained in book, claims and attached drawing.
Brief description of the drawings
Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole attached drawing
In, identical reference symbol represents identical component.
Fig. 1 is the flow diagram of the method for the embodiment of the present invention；
Fig. 2 is the basic composition for the marine diesel transient speed acquisition system that the method for the embodiment of the present invention uses
Schematic diagram；
Fig. 3 is the process that the embodiment of the present invention carries out transient speed spectrum analysis；
Fig. 4 is the process that the embodiment of the present invention asks for marine diesel unstable ratio；
Fig. 5 is the structure diagram of described device of the embodiment of the present invention.
Embodiment
The preferred embodiment of the present invention is specifically described below in conjunction with the accompanying drawings, wherein, attached drawing forms the application part, and
It is used to explain the principle of the present invention together with embodiments of the present invention.
The method of the embodiment of the present invention is described in detail with reference to attached drawing first.
As shown in Figure 1, Fig. 1 is the flow diagram of the method for the embodiment of the present invention, mainly include：According to different operating modes
Transient speed is intercepted, obtains multigroup transient speed waveform signal under different operating modes；Using Fourier transform to interception
Transient speed waveform signal carries out spectrum analysis and obtains transient speed waveform signal frequency domain amplitude spectrum；To multigroup instantaneous turn of acquisition
Fast waveform signal frequency domain amplitude spectrum carries out frequency search respectively, determines the frequency domain amplitude peak value in preset range；According to predetermined model
Interior frequency domain amplitude peak value is enclosed, marine diesel job insecurity is calculated and compares USR.
The method of the embodiment of the present invention obtains diesel engine flash speed by marine diesel transient speed acquisition system
Signal, and spectrum analysis is carried out to transient speed signals complete cycle, obtain 0.5 humorous time, 1 frequency multiplication, 1.5 frequencys multiplication, 2 frequencys multiplication, 2.5 times
Frequently, 3 frequencys multiplication and its with magnitude peak in frequency domain.Bavin peculiar to vessel is asked for according to more order frequency domain amplitude peak values of multigroup transient speed
It is unstable than USR (Unstable Rate) under each operating mode of oil machine, judge marine diesel job insecurity using unstable ratio
Degree and time of occurrence.
Fig. 2 shows the basic of marine diesel transient speed acquisition system used in the method for the embodiment of the present invention
Composition schematic diagram, the acquisition system are made of TDCS TDC Sensor, transient speed sensor, transient speed harvester, finally
Transient speed signals can be exported, TDCS TDC Sensor signal plays the work for ensureing whole work period sampling transient speed signals
With.
Fig. 3 shows that the present invention to being intercepted according to different operating modes to transient speed, obtains multigroup wink under different operating modes
When speed waveform signal, signal intercept process using rotating speed as foundation, according to engineering experience rotating speed in the range of [600,1000] most
45 groups of transient speed signals are intercepted less, and 60 groups of transient speed signals, [1500-2500] are at least intercepted in the range of [1000,1500]
In the range of minimum 80 groups of transient speed signals of interception, 85 groups of transient speed signals when more than 2500.Using Fourier transform (FFT)
Transient speed waveform signal progress spectrum analysis to interception obtains transient speed waveform signal frequency domain amplitude spectrum.
Fig. 4 shows that the present invention asks for marine diesel the process of unstable ratio, to multigroup transient speed ripple of acquisition
Shape signal frequency domain amplitude spectrum carries out frequency search respectively, determines [0.5f-5%f, 0.5f+5%f], [f-5%f, f+5%f],
[1.5f-5%f, 1.5f-5%f], [2f-5%f, 2f+5%f], [2.5f-5%f, 2.5f+5%f], [3f-5%f, 3f+5%
F] in the range of frequency domain amplitude, the frequency domain amplitude peak value asked in given range (asks for frequency domain width according to general known FFT methods
Magnitude peak in value spectrum and frequency band), marine diesel job insecurity is than USR calculation formula：
Wherein, S1 is frequency domain amplitude peak value in the range of [0.5f-5%f, 0.5f+5%f],It is in for marine diesel
Measured during normal condition multigroup (data group number corresponds to marine diesel operating mode) transient speed data ask for [0.5f-5%f,
0.5f+5%f] in the range of the peak-to-average that calculates after frequency domain amplitude peak value；S2 is frequency domain width in the range of [f-5%f, f+5%f]
It is worth peak value,Measured when being in normal condition for marine diesel and multigroup (number is measured when marine diesel is in normal condition
Corresponding to marine diesel operating mode according to group number) transient speed data ask for frequency domain amplitude peak value in the range of [f-5%f, f+5%f]
The peak-to-average calculated afterwards；S3 is frequency domain amplitude peak value in the range of [1.5f-5%f, 1.5f-5%f],For marine diesel
Multigroup (data group number corresponds to marine diesel operating mode) transient speed data are measured during in normal condition and ask for [1.5f-5%
F, 1.5f-5%f] in the range of the peak-to-average that calculates after frequency domain amplitude peak value；S4 is frequency in the range of [2f-5%f, 2f+5%f]
Domain magnitude peak,Measure that multigroup (data group number corresponds to marine diesel work when being in normal condition for marine diesel
Condition) transient speed data ask for the peak-to-average that is calculated in the range of [2f-5%f, 2f+5%f] after frequency domain amplitude peak value；S5 is
Frequency domain amplitude peak value in the range of [2.5f-5%f, 2.5f+5%f],Measured when being in normal condition for marine diesel more
Group (data group number corresponds to marine diesel operating mode) transient speed data ask for frequency in the range of [2.5f-5%f, 2.5f+5%f]
The peak-to-average calculated after the magnitude peak of domain；S6 is frequency domain amplitude peak value in the range of [3f-5%f, 3f+5%f],To be peculiar to vessel
Diesel engine measures multigroup (data group number corresponds to marine diesel operating mode) transient speed data and asks for when being in normal condition
The peak-to-average calculated in the range of [3f-5%f, 3f+5%f] after frequency domain amplitude peak value.
Determine that marine diesel is in job insecurity when USR is more than 12, record USR is more than 12 initial time, USR
Numerical value is bigger, and marine diesel work is more unstable.
Next described device of the embodiment of the present invention is described in detail.
As shown in figure 5, Fig. 5 is the structure diagram of described device of the embodiment of the present invention, can specifically include：
Acquisition module, for being intercepted according to different operating modes to transient speed, obtains under different operating modes multigroup instantaneous turn
Fast waveform signal；
Computation analysis module, obtains for carrying out spectrum analysis to the transient speed waveform signal of interception using Fourier transform
Composed to transient speed waveform signal frequency domain amplitude；Multigroup transient speed waveform signal frequency domain amplitude of acquisition is composed respectively into line frequency
Rate is searched for, and determines the frequency domain amplitude peak value in preset range；According to the frequency domain amplitude peak value in preset range, marine diesel oil is calculated
Machine job insecurity compares USR.
Monitoring modular, for being monitored to marine diesel job insecurity than USR, when more than predetermined threshold, really
Determine marine diesel and be in job insecurity, record USR is more than the initial time of the predetermined threshold.
Wherein, acquisition module according to engineering experience rotating speed, believe by minimum 45 groups of transient speeds of interception in the range of [600,1000]
Number, 60 groups of transient speed signals are at least intercepted in the range of [1000,1500], 80 groups of winks are at least intercepted in the range of [1500-2500]
When tach signal, 85 groups of transient speed signals when more than 2500.
Computation analysis module carries out spectrum analysis to the transient speed waveform signal of interception using Fourier transform and obtains wink
When speed waveform signal frequency domain amplitude spectrum；Multigroup transient speed waveform signal frequency domain amplitude spectrum of acquisition is searched into line frequency respectively
Rope, determines [0.5f-5%f, 0.5f+5%f], [f-5%f, f+5%f], [1.5f-5%f, 1.5f-5%f], [2f-5%f,
2f+5%f], [2.5f-5%f, 2.5f+5%f], the frequency domain amplitude in the range of [3f-5%f, 3f+5%f], asks for given range
Interior frequency domain amplitude peak value；Then the marine diesel job insecurity ratio is calculated according to equation below：
Wherein,
S1~S6 is respectively the frequency domain amplitude peak value in the range of different frequency,Surveyed when being in normal condition for marine diesel
Multigroup transient speed data are taken to ask for the peak-to-average calculated in the range of different frequency after frequency domain amplitude peak value.
Specific implementation process for described device of the embodiment of the present invention, due to being described in detail in the above method, therefore
Details are not described herein again.
In conclusion an embodiment of the present invention provides a kind of marine diesel job stability analysis method and device, lead to
Cross and calculate the unstable accurate evaluation than realizing to marine diesel job stability, have and calculate simple accurate, result of calculation
With pointing clearly to property, suitable for all types of marine diesels (arranging machine and V-type machine), independent of experience or a large amount of real
The advantages of testing.
It will be understood by those skilled in the art that realizing all or part of flow of above-described embodiment method, meter can be passed through
Calculation machine program instructs relevant hardware to complete, and the program can be stored in computer-readable recording medium.Wherein, institute
Computer-readable recording medium is stated as disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should be covered by the protection scope of the present invention.
Claims (5)
- A kind of 1. marine diesel job stability analysis method, it is characterised in that including：Transient speed is intercepted according to different operating modes, obtains multigroup transient speed waveform signal under different operating modes；Spectrum analysis is carried out to the transient speed waveform signal of interception using Fourier transform and obtains transient speed waveform signal frequency Domain amplitude spectrum；Frequency search is carried out respectively to multigroup transient speed waveform signal frequency domain amplitude spectrum of acquisition, determine [0.5f-5%f, 0.5f+5%f], [f-5%f, f+5%f], [1.5f-5%f, 1.5f-5%f], [2f-5%f, 2f+5%f], [2.5f-5% F, 2.5f+5%f], the frequency domain amplitude in the range of [3f-5%f, 3f+5%f], asks for the frequency domain amplitude peak value in given range； According to the frequency domain amplitude peak value in preset range, calculate marine diesel job insecurity and compare USR；The marine diesel job insecurity ratio is calculated according to equation below：Wherein, S1~ S6 is respectively the frequency domain amplitude peak value in the range of different frequency,Measured when being in normal condition for marine diesel more Group transient speed data ask for the peak-to-average calculated in the range of different frequency after frequency domain amplitude peak value；Marine diesel job insecurity is monitored than USR, when more than predetermined threshold, determines that marine diesel is in work Make unstable, initial times of the record USR more than the predetermined threshold.
- 2. according to the method described in claim 1, it is characterized in that, the predetermined threshold is 12.
- 3. according to the method described in claim 1, it is characterized in that, specifically include：45 groups of transient speed signals, [1000,1500] model are at least intercepted in the range of [600,1000] according to engineering experience rotating speed Enclose it is interior at least interception 60 groups of transient speed signals, in the range of [1500-2500] at least interception 80 groups of transient speed signals, 2500 with 85 groups of transient speed signals when upper.
- A kind of 4. marine diesel job stability analytical equipment, it is characterised in that including：Acquisition module, for being intercepted according to different operating modes to transient speed, obtains multigroup transient speed ripple under different operating modes Shape signal；Computation analysis module, wink is obtained for carrying out spectrum analysis to the transient speed waveform signal of interception using Fourier transform When speed waveform signal frequency domain amplitude spectrum；Multigroup transient speed waveform signal frequency domain amplitude spectrum of acquisition is searched into line frequency respectively Rope, determines the frequency domain amplitude peak value in preset range；According to the frequency domain amplitude peak value in preset range, marine diesel work is calculated Make unstable to compare USR.Monitoring modular, for being monitored to marine diesel job insecurity than USR, when more than predetermined threshold, determines ship Job insecurity is in diesel engine, record USR is more than the initial time of the predetermined threshold.The computation analysis module is specifically used for, and frequency spectrum point is carried out to the transient speed waveform signal of interception using Fourier transform Analysis obtains transient speed waveform signal frequency domain amplitude spectrum；To multigroup transient speed waveform signal frequency domain amplitude of acquisition spectrum respectively into Line frequency is searched for, and is determined [0.5f-5%f, 0.5f+5%f], [f-5%f, f+5%f], [1.5f-5%f, 1.5f-5%f], [2f-5%f, 2f+5%f], [2.5f-5%f, 2.5f+5%f], the frequency domain amplitude in the range of [3f-5%f, 3f+5%f], is asked Draw the frequency domain amplitude peak value determined in scope；Then the marine diesel job insecurity ratio is calculated according to equation below：Wherein, S1~ S6 is respectively the frequency domain amplitude peak value in the range of different frequency,Measured when being in normal condition for marine diesel more Group transient speed data ask for the peak-to-average calculated in the range of different frequency after frequency domain amplitude peak value.
- 5. device according to claim 4, it is characterised in that the acquisition module according to engineering experience rotating speed [600, 1000] 45 groups of transient speed signals are at least intercepted in the range of, minimum 60 groups of transient speeds letters of interception in the range of [1000,1500] Number, minimum 80 groups of transient speed signals of interception in the range of [1500-2500], 85 groups of transient speed signals when more than 2500.
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| CN114878173B (en) * | 2022-05-20 | 2023-08-18 | 北京理工大学 | A Judgment Method of Combustion Uniformity of Each Cylinder Based on Speed Peak Analysis |
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| EP0762101A1 (en) * | 1995-08-28 | 1997-03-12 | Jenbacher Energiesysteme Ag | Identification of irregular working conditions of a combustion engine by revolution dependent torsional vibrations of the crankshaft |
| US6993439B2 (en) * | 2002-09-13 | 2006-01-31 | Innovative Scientific Solutions, Inc. | Motor based condition monitoring |
| CN101266197A (en) * | 2007-03-12 | 2008-09-17 | 斯奈克玛 | Method of detecting damage to an antifriction bearing of a motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0762101A1 (en) * | 1995-08-28 | 1997-03-12 | Jenbacher Energiesysteme Ag | Identification of irregular working conditions of a combustion engine by revolution dependent torsional vibrations of the crankshaft |
| US6993439B2 (en) * | 2002-09-13 | 2006-01-31 | Innovative Scientific Solutions, Inc. | Motor based condition monitoring |
| CN101266197A (en) * | 2007-03-12 | 2008-09-17 | 斯奈克玛 | Method of detecting damage to an antifriction bearing of a motor |
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