CN103049670A - Pipe excitation source identification and prediction method of vibration response to pipe excitation source - Google Patents
Pipe excitation source identification and prediction method of vibration response to pipe excitation source Download PDFInfo
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- CN103049670A CN103049670A CN2013100127864A CN201310012786A CN103049670A CN 103049670 A CN103049670 A CN 103049670A CN 2013100127864 A CN2013100127864 A CN 2013100127864A CN 201310012786 A CN201310012786 A CN 201310012786A CN 103049670 A CN103049670 A CN 103049670A
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Abstract
The invention aims at providing pipe excitation source identification and a prediction method of vibration response to a pipe excitation source. The steps are collecting a pipe wall acceleration signal and transforming the collected time domain signal into a frequency domain signal through Fourier transform, performing excitation source identification and equivalence and using a linear system superposition method to determine the size of the pipe system equivalent excitation source through comparing the experimental data with the pipe system dynamics calculation result, and using a transfer matrix method for predicting the dynamic response to the vibration of any optional position of the pipe according to the equivalent excitation. According to the pipe excitation source identification and the prediction method of vibration response to a pipe excitation source, an appropriate measuring point easy to measure is chosen according to the specific arrangement of the pipe for the excitation source size identification and the pipe vibration prediction, so that problem of the pipe system excitation source characteristics and the difficult vibration measurement of some portions of the pipe and others can be solved, the experimental measurement points arrangement can be reduced and the flexibility of the pipe vibration measurement can be increased.
Description
Technical field
What the present invention relates to is the Forecasting Methodology in a kind of vibration and noise reducing field.
Background technology
Piping system extensively is present in the industries such as petrochemical complex, operation of ship, vibration in the fluid conveying pipe course of work and noise tend to the normal operation of working environment and pipeline exact instrument annex is produced harmful effect, therefore pipeline driving source characteristic and vibration survey thereof and prediction are become the vital part in pipe vibration noise control aspect.
The driving source of pipe conveying fluid road system had both comprised the service parts such as valve, pump, also comprised the Fluctuating Pressure Field that acts on the tube wall, and was therefore very complicated and comparatively difficult to the accurate identification of pipeline driving source.Mainly contain at present the size that dual mode can obtain the pipeline driving source, a kind of is that the driving source size is directly measured in vibration or pressure fluctuation installation of sensors near driving source; Another kind is by the vibration at other positions of measuring channel or fluid pulsation, by the size of the transport function relation recognition driving source between driving source and measuring point.
The direct measuring method of driving source is comparatively simple, and Peter O.Paulson (US6082193PIPELINE MONITORING ARRAY, 2000.) realizes the noise monitoring of pipeline by arrange nautical receiving set at pipeline.Philippe Bousquet (US5925821DEVICE FOR MEASURING NOISE IN A PIPE TRAVERSED BY A FLUID, 1999.) then invents a kind of size that is used for measuring valve, elbow equal excitation source with the pipeline driving source measurement mechanism of cavity.The major advantage of this device is that tube fluid both can be that gas also can be liquid to the fluid media (medium) no requirement (NR) in managing.
Because pipeline is installed and the restriction of actual working environment, is not that all pipeline driving sources can utilize sensor directly to measure, so people have also just carried out more research to the identification of driving source.
Bartlett and Flannelly(Modal Verification of Force Determination for Measuring Vibration Loads.Journal of the American Helicopter Society, 1979:10～18) just once identified the dynamic load of helicopter main shaft with acceleration responsive and transfer matrix as far back as 1979.After this, S.H.Yap and B.M.Gibbs(Indirect measurement of vibrational energy flow by reciprocal methods, Proc.of Inter-noise, 1996,3:1273-1276) proposed to measure frequency response function matrix with reciprocity method in 1996, record the exciting force of centrifugal blower work to the floor, and calculated power stream.Weng Xuetao (utilizes frequency response function to ask external drive, noise and vibration control, 1999,1:46-48) 1999 by the relation between analyzing excitation and responding, propose a kind of measurement structure of passing through to the response of known excitation, obtained the deterministic dependence between response and the excitation, i.e. frequency response function, and then record structure to the response of the unknown excitation, thereby try to achieve unknown inspiring methods.Millet et.al. (WO2004031719 (A1) METHOD FOR DETECTING AND LOCATING AT LEST ONE NOISE IN A PIPE TRANSPORTING A FLUID AND INSTALLATION THEREFOR, 2004.) measure by the vibration noise of multiple spot, sound source is positioned, and definite sound source size.Frederick Wayne Catron(US7814936B2, Sound pressure level feedback control, Oct.19,2010) based on computing formula and transmission loss formula between tube noise and the pipe external radiation noise, utilize tube wall vibration prediction valve noise, and invented a valve noise feedback control system.
Above-mentioned achievement in research all is to carry out driving source identification based on experiment fully, and recognizer is complicated.
Summary of the invention
The object of the present invention is to provide the indirect measurement that realizes the pipe vibration response, thus the identification of the pipeline driving source of the measuring point quantity when reducing the pipe vibration response measurement and vibratory response Forecasting Methodology thereof.
The object of the present invention is achieved like this:
Pipeline driving source identification of the present invention and vibratory response Forecasting Methodology thereof is characterized in that:
(1) determines pipeline equivalence driving source position, and set up the frequency domain transfer matrix TMM model D of pipe system
Tot:
According to the deployment scenarios in valve, take-off pipe and bend pipe equal excitation source in the pipe system, determine position and the number n of driving source identification, and suppose that the size of i driving source equals x
i(i=1,2 ... n), set up the TMM model of pipe system, the pipe system equation all can be written as following form arbitrarily:
D
totΦ
tot=F
tot，
D wherein
TotExpression is by pipeline boundary condition D
b, pipe system point transfer matrix D
pWith field transfer matrix D
cThe whole transfer coefficient matrix that forms, Φ
TotRepresent the overall status vector that each checkpoint state parameter forms, the vector that is namely formed by hydrodynamic pressure, vibration acceleration and the moment of each reference point of pipeline, F
TotExpression is by driving source vector F
fWith pipe system point transfer matrix D
pWith field transfer matrix D
cActing in conjunction and the excitation vector that forms;
(2) the tube wall vibration acceleration signal gathers and pre-service:
Choose the vibration reference point of identifying for driving source in the pipeline optional position, gather the tube wall vibration acceleration signal at vibration reference point place, and by Fourier transform FFT the time domain vibration acceleration signal that gathers is converted to the frequency domain vibration acceleration signal;
(3) driving source identification and equivalence:
In the excitation of the driving source equivalent position unit of applying, utilize the TMM model of setting up, calculate respectively the vibration acceleration of vibration reference point; Utilize the superposition principle of linear system, will vibrate the reference point vibration acceleration and multiply by x
i(i=1,2 ... n) also stack, the reference point vibration acceleration after the stack equate with the value of the vibration reference point frequency domain vibration acceleration signal that step (2) obtains, and draw driving source vector F
f
(4) prediction of other position vibration accelerations of pipeline
With equivalent driving source vector F
fBring formula TMM model into, can obtain the vibration acceleration Φ of reference point
Tot, other some vibration booster response of recycling pipe system Φ
xWith reference point acceleration Φ
TotBetween transitive relation Φ
x=D
pD
cΦ
Tot, further dope the vibration acceleration Φ of other optional positions of pipeline
x
The present invention can also comprise:
1, described TMM model can replace with finite element model and characteristic curve model.
2, described vibration reference point for driving source identification is arranged between the pipeline section and driving source of vibration acceleration to be predicted.
When 3, being i=1 for single driving source system, the ratio between the frequency domain response of the vibration acceleration of the vibration reference point that records and the vibration acceleration response of this reference point that TMM finds the solution is the excitation size of identification.
Advantage of the present invention is: the present invention can be according to the concrete arrangement form of pipeline, the suitable measuring point that selection is convenient to measure, identification driving source size and prediction pipe vibration, solve pipe system driving source characteristic and part pipeline section and vibrate the problems such as difficult measurement, and can reduce the experiment measuring point and arrange, increase the dirigibility that pipe vibration is measured.Compare with traditional identification measuring method, it is fast that the present invention has the driving source recognition speed, and it is simple that predictor is measured in vibratory response, and experimental cost is low, the characteristics that applicability is strong, precision of prediction is high.
Description of drawings
Fig. 1 is driving source recognition technology of the present invention and vibratory response prediction FB(flow block);
Fig. 2 is the implementation process flow diagram of driving source recognition technology and vibratory response forecasting techniques;
Fig. 3 is that checking experimental system is arranged schematic diagram;
Fig. 4 is the spectrum curve figure of the vibration reference point B of experiment measuring;
Fig. 5 is the spectral characteristic of the equivalent driving source A of identification;
Fig. 6 is the prediction and experiment spectrum curve comparison diagram of pipeline C point vibration;
Fig. 7 is the prediction and experiment third-octave comparison diagram of pipeline C point vibration.
Embodiment
For example the present invention is described in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1～3, driving source identification of the present invention and vibration prediction method contain following steps:
(1) determines pipeline equivalence driving source position, and set up frequency domain transfer matrix (TMM) model (D of pipe system
Tot).
At first according to valve in the pipe system, the deployment scenarios in take-off pipe and bend pipe equal excitation source is determined position and the number n of driving source identification, and is supposed that the size of i driving source equals x
i(i=1,2 ... n).Then according to the equation of motion of pipe system, set up the TMM model of pipe system.
As shown in Figure 2, except the TMM model that can set up pipe system, also can set up finite element (FEM) model and characteristic curve (MOC) model, but the FEM computation period is long, modeling is complicated; MOC is not suitable for the pipe system of finding the solution complexity; So recommend adoption TMM model of the present invention.
Theoretical according to TMM, the pipe system equation all can be written as following form arbitrarily:
D
totΦ
tot=F
tot，
In equation (1), D
TotExpression is by pipeline boundary condition (D
b), pipe system point transfer matrix (D
p) and a transfer matrix (D
c) the whole transfer coefficient matrix that forms; Φ
TotRepresent the overall status vector that each checkpoint state parameter forms, that is, by the hydrodynamic pressure of each reference point of pipeline, the vector that vibration acceleration and moment form; F
TotExpression is by driving source vector (F
f) and pipe system point transfer matrix (D
p) and a transfer matrix (D
c) acting in conjunction and the excitation vector that forms.
(2) the tube wall vibration acceleration signal gathers and pre-service
At first choose the vibration reference point for driving source identification, theoretically, the vibration reference point can be arranged in the pipeline optional position, but in order to improve accuracy of identification, and suggestion will be vibrated between the pipeline section and driving source that reference point is arranged in vibration acceleration to be predicted.Then gather the tube wall vibration acceleration signal at vibration reference point place, and by Fourier transform (FFT) the time domain vibration acceleration signal that gathers is converted to the frequency domain vibration acceleration signal.
For example, in the pilot system shown in the accompanying drawing 3, the A point is the driving source position, selects B point as the vibration reference point, record the vibration acceleration time-domain signal that B orders after, pass through after the Fourier transform B point frequency domain vibration acceleration signal as shown in Figure 4.
(3) driving source identification and equivalence
This link is implemented by following two parts:
1) in the excitation of the driving source equivalent position unit of applying, solves the vibratory response at vibration reference point place.
In each the driving source position unit of applying excitation, utilize the TMM model of (1) step foundation, calculate respectively the vibration acceleration of vibration reference point.
2) utilize the superposition principle of linear system, previous step is found the solution respectively vibrated the reference point vibration acceleration and multiply by x
i(i=1,2 ... n) also stack, the reference point vibration acceleration after the order stack equates that with the value of the vibration reference point frequency domain acceleration signal that (2) step obtained solving equations can draw driving source vector (F
f).Especially, for single driving source system (i=1), the ratio between the frequency domain response of the vibration acceleration of the vibration reference point that experiment records and the vibration acceleration response of this reference point that TMM finds the solution is the excitation size of identification.
For example, in the system shown in the accompanying drawing 3, vibrate with reference to the accompanying drawings the frequency domain vibration acceleration signal of reference point B shown in 4, the size of the driving source A that identifies as shown in Figure 5.
(3) prediction of other position vibration accelerations of pipeline
By equation (1) as can be known, at D
TotAnd F
TotUnder the known condition, according to
Can obtain at an easy rate Φ
Tot
The equivalent driving source vector (F that previous step is identified
f) bring formula (1) into, can obtain the vibration acceleration Φ of reference point
Tot, other some vibration booster response of recycling pipe system Φ
xWith reference point acceleration Φ
TotBetween transitive relation (Φ
x=D
pD
cΦ
Tot), namely can further dope the vibration acceleration Φ of other optional positions of pipeline
x
According to ISO 1683(ISO 1683 Acoustics-Preferred reference values for acoustical and vibratory levels) vibration acceleration is converted into the form of vibration acceleration level, and utilize energy stacking method, the third-octave distribution form of the pipe vibration AL Acceleration Level that can calculate.
For example choose C point among Fig. 3 as the vibration acceleration predicted position, predict the outcome with the frequency domain line spectrum figure that tests more as shown in Figure 6, the comparative result of the C point AL Acceleration Level of the C of prediction point vibration acceleration level and experiment measuring is as shown in Figure 7.
Can be found out by accompanying drawing 7, adopt the driving source of the present invention's identification can be used for the prediction of pipe vibration, thereby realize the indirect measurement of pipeline arbitrfary point, and have higher precision.As in this example, the error between C point global vibration AL Acceleration Level predicted value and the experiment measured value only is 0.2dB.Simultaneously, the present invention also can be applicable to the vibration state monitoring of pipe system engineering design and the former meaning of pipeline work position.
Can be according to the concrete arrangement form of pipeline by the present invention, the suitable measuring point that selection is convenient to measure, identification driving source size and prediction pipe vibration, solve pipe system driving source characteristic and part pipeline section and vibrate the problems such as difficult measurement, and can reduce the experiment measuring point and arrange, increase the dirigibility that pipe vibration is measured.Compare with traditional identification measuring method, it is fast that the present invention has the driving source recognition speed, and it is simple that predictor is measured in vibratory response, and experimental cost is low, the characteristics that applicability is strong.The comparing result of accompanying drawing 6 and accompanying drawing 7 shows, precision of prediction of the present invention is higher, can be used for the indirect measurement of pipeline arbitrfary point vibratory response.
Data processing method implementation procedure provided by the invention is easy, is easy to programming and calculates.The present invention both can be used as standalone module and had been used for the experimental data aftertreatment, also can be embedded in the data acquisition equipment, realized the Real-Time Monitoring of pipe system key position vibratory response.
Claims (5)
1. the pipeline driving source is identified and the vibratory response Forecasting Methodology, it is characterized in that:
(1) determines pipeline equivalence driving source position, and set up the frequency domain transfer matrix TMM model D of pipe system
Tot:
According to the deployment scenarios in valve, take-off pipe and bend pipe equal excitation source in the pipe system, determine position and the number n of driving source identification, and suppose that the size of i driving source equals x
i(i=1,2 ... n), set up the TMM model of pipe system, the pipe system equation all can be written as following form arbitrarily:
D
totΦ
tot=F
tot，
D wherein
TotExpression is by pipeline boundary condition D
b, pipe system point transfer matrix D
pWith field transfer matrix D
cThe whole transfer coefficient matrix that forms, Φ
TotRepresent the overall status vector that each checkpoint state parameter forms, the vector that is namely formed by hydrodynamic pressure, vibration acceleration and the moment of each reference point of pipeline, F
TotExpression is by driving source vector F
fWith pipe system point transfer matrix D
pWith field transfer matrix D
cActing in conjunction and the excitation vector that forms;
(2) the tube wall vibration acceleration signal gathers and pre-service:
Choose the vibration reference point of identifying for driving source in the pipeline optional position, gather the tube wall vibration acceleration signal at vibration reference point place, and by Fourier transform FFT the time domain vibration acceleration signal that gathers is converted to the frequency domain vibration acceleration signal;
(3) driving source identification and equivalence:
In the excitation of the driving source equivalent position unit of applying, utilize the TMM model of setting up, calculate respectively the vibration acceleration of vibration reference point; Utilize the superposition principle of linear system, will vibrate the reference point vibration acceleration and multiply by x
i(i=1,2 ... n) also stack, the reference point vibration acceleration after the stack equate with the value of the vibration reference point frequency domain vibration acceleration signal that step (2) obtains, and draw driving source vector F
f
(4) prediction of other position vibration accelerations of pipeline:
With equivalent driving source vector F
fBring formula TMM model into, can obtain the vibration acceleration Φ of reference point
Tot, other some vibration booster response of recycling pipe system Φ
xWith reference point acceleration Φ
TotBetween transitive relation Φ
x=D
pD
cΦ
Tot, further dope the vibration acceleration Φ of other optional positions of pipeline
x
2. pipeline driving source according to claim 1 is identified and the vibratory response Forecasting Methodology, it is characterized in that: described TMM model can replace with finite element model and characteristic curve model.
3. pipeline driving source according to claim 1 and 2 is identified and the vibratory response Forecasting Methodology, it is characterized in that: described vibration reference point for driving source identification is arranged between the pipeline section and driving source of vibration acceleration to be predicted.
4. pipeline driving source according to claim 1 and 2 is identified and the vibratory response Forecasting Methodology, it is characterized in that: when being i=1 for single driving source system, the ratio between the frequency domain response of the vibration acceleration of the vibration reference point that records and the vibration acceleration response of this reference point that TMM finds the solution is the excitation size of identification.
5. pipeline driving source according to claim 3 is identified and the vibratory response Forecasting Methodology, it is characterized in that: when being i=1 for single driving source system, the ratio between the frequency domain response of the vibration acceleration of the vibration reference point that records and the vibration acceleration response of this reference point that TMM finds the solution is the excitation size of identification.
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| CN105260806A (en) * | 2015-11-25 | 2016-01-20 | 中国船舶重工集团公司第七一九研究所 | Fluid solid coupling dynamic characteristic prediction method for pipeline system |
| CN105675111A (en) * | 2014-11-19 | 2016-06-15 | 索尼公司 | Noise detection method, noise detection device and electronic equipment |
| WO2016095236A1 (en) * | 2014-12-17 | 2016-06-23 | 苏州宝润电子科技有限公司 | Pipeline structure stress and fatigue monitoring method |
| CN106250653A (en) * | 2016-08-16 | 2016-12-21 | 北京交通大学 | A kind of full information high accuracy transmission function prediction method |
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| CN107590321A (en) * | 2017-08-25 | 2018-01-16 | 中国船舶重工集团公司第七〇九研究所 | A kind of overall measuring method of pipe vibration response |
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