CN109580144A - It is a kind of that the method for inspection is omitted based on the path OTPA for improving heavy phase dry analysis - Google Patents
It is a kind of that the method for inspection is omitted based on the path OTPA for improving heavy phase dry analysis Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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Abstract
The method of inspection is omitted based on the path OTPA for improving heavy phase dry analysis the invention discloses a kind of, step 1, crosstalk reduction processing is carried out to reference point, target point response signal under operating condition of test, obtains incoherent test signal two-by-two；Step 2, auto-power spectrum analysis, each input signal and output signal are carried out to each input signal, output signal respectively and carries out crosspower spectrum analysis；Step 3, according to result is differentiated to OTPA transmission path model progress Integrity Assessment, completion heavy phase dry analysis transmission path, which is omitted, to be examined.This method avoids driving source each in practical engineering application, there are traditional coherent theory in the case of coherence can not whether there is or not important paths to omit the technological deficiency tested to OTPA model, possess the ability that crosstalk couplings are interfered between resisting reference point signal well, can to transmission path under normal circumstances omit examine play the role of it is good, accurately differentiate effect, to OTPA model foundation and amendment have scientific guidance.
Description
Technical field
It is the invention belongs to mechanical oscillation signal processing and vibration and noise reducing field, in particular to a kind of based on dry point of improvement heavy phase
Omit the method for inspection in the path OTPA of analysis.
Background technique
The Sound stealth performance Sound stealth performance of underwater ordnance is to measure the important indicator of its safety and fight capability, because
This, effective monitoring that shell structure equips vibration noise has important engineering significance for improving equipment performance with control.Vibration
Or the identification of noise transmission path is the key that problem, is transmitted at present frequently with Transfer path analysis (TPA) or operating condition
The method of path analysis (OTPA) identifies vibration or noise transmission path, and traditional Transfer Path Analysis Method of Automobile is multiple due to it
Miscellaneous frequency response function test and load identification process cause to be difficult to quickly and effectively identify transmission path in practice in engineering, transport
Row operating condition Transfer Path Analysis Method of Automobile is a kind of transmission path rapid analysis method occurred in recent years, and this method utilizes test work
Condition data identification transmitting interest rate Jacobian matrix, and is used for actual condition data, thus obtain transmission path contribution amount as a result,
This method is simple and fast, is widely used in engineering in practice.
Existing OTPA method is likely to occur transmission path omission or misjudgment phenomenon during model foundation, seriously affects mould
Type reliability and noise source contribution amount Evaluation accuracy.Therefore, it is necessary to carry out transmission path Completeness to OTPA model, it is ensured that
Model is accurate and reliable.
Summary of the invention
The method of inspection is omitted based on the path OTPA for improving heavy phase dry analysis the purpose of the present invention is to provide a kind of, with solution
The certainly above problem.
To achieve the above object, the invention adopts the following technical scheme:
It is a kind of that the method for inspection is omitted based on the path OTPA for improving heavy phase dry analysis, include the following steps,
Step 1, it chooses and analyzes mechanical system reference point response signal X1,X2,...,XkCrosstalk reduction is carried out to handle to obtain
Incoherent purified signal X two-by-two11,X22,...,Xkk；
Step 2, each reference point response signal X after cutting down crosstalk11,X22,...,XkkAnd target point response signal Y
Its auto-power spectrum is asked to obtain respectively
Step 3, each reference point response signal X after crosstalk being cut down11,X22,...,XkkRespectively with target point response signal
Y is obtained as crosspower spectrum
Step 4, the normal coherent function value between each input signal of computing system and output signal, the cumulative system heavy phase that obtains are done
Functional value, i.e.,
Step 5, differentiated according to heavy phase dry analysis test criterion, if meeting criterion, can determine that system model
There is no the omissions of main transmission path, and model is accurately reliable；If being unsatisfactory for criterion, it is main to can determine that system model exists
Transmission path is omitted, and needs to improve model or rebuild.
Further, step 1, vibration acceleration sensor witness mark, target point response letter are all made of in step 2
Number.
Further, in step 1 using traditional crosstalk cutting method based on priori transport function to observation signal into
Row crosstalk reduction handles to obtain incoherent purified signal X two-by-two11,X22,...,Xkk, k is reference point response signal quantity.
Further, in step 2 using based on AR modelling respectively to crosstalk cut down after each reference point response signal and
Target point response signal carries out auto-power spectrum estimation, and wherein model parameter is solved using Burg algorithm.
Further, in step 3 using Welch method crosstalk is cut down after each reference point response signal respectively with target point
Response signal carries out cross-power spectrum estimation, wherein carrying out Welch method cross-power spectrum estimation by 2:1 Overlapping Fragment.
Further, i-th of reference point response signal and the normal phase between target point response signal after crosstalk is cut down in step 4
Dry functional value is
Further, when each input signal of system is irrelevant two-by-two in step 4, heavy phase dry analysis, heavy phase are made to system
Dry functional value be the normal coherent function value of each input signal of system and output signal and, i.e.,Wherein k is reference point response signal quantity.
Further, heavy phase dry analysis test criterion in step 5 are as follows: if the dry functional value of heavy phase is basic in basic frequency and nearby
MeetIt can determine that and meet test criterion, be otherwise judged to being unsatisfactory for test criterion.
Compared with prior art, the present invention has following technical effect:
The present invention acquires reference point under operating condition of test and responds according to analyzing mechanical system structure design operating condition of test
Signal and target point response signal, are omitted or misjudgment phenomenon for the transmission path being likely to occur during OTPA model foundation,
Model is cut down using crosstalk and handles to obtain purified signal mutually incoherent two-by-two to observation signal progress crosstalk reduction, by each
Input signal and output signal carry out weight Coherence Function Analysis, differentiate whether its coherence meets test criterion, examine if meeting
Criterion, shows that model is accurate and reliable, needs to improve model or rebuild if being unsatisfactory for.By being transmitted to shell structure two-stage
Path system carries out path and omits inspection, carries out the dry analysis of complete trails heavy phase to the first order, second level transmission path system respectively,
It carries out discriminating whether to meet condition using test criterion, verifies the reliability of the adjustment model；Respectively to the first order, second level transmission path system
System carry out omit respective paths heavy phase dry analysis, using test criterion carry out differentiate and with complete trails heavy phase dry analysis result into
Row comparison, verifies the validity of the method for the present invention.
Detailed description of the invention
Fig. 1 is shell structure testing stand two-stage transmission path system model described in preferred embodiment of the present invention；
Fig. 2 is first order complete trails described in preferred embodiment of the present invention and target point heavy phase dry analysis result；
Fig. 3 is first order path 1 described in preferred embodiment of the present invention and target point heavy phase dry analysis result；
Fig. 4 is first order path 2 described in preferred embodiment of the present invention and target point heavy phase dry analysis result；
Fig. 5 is second level complete trails described in preferred embodiment of the present invention and target point heavy phase dry analysis result；
Fig. 6 a, 6b, 6c and 6d are each path in the second level and target point heavy phase dry analysis described in preferred embodiment of the present invention
As a result；
Fig. 7 a, 7b, 7c and 7d be the second level described in preferred embodiment of the present invention omit in the case of each paths respectively and
Target point heavy phase dry analysis result；
Specific embodiment
Below in conjunction with attached drawing, the present invention is further described:
The method of inspection is omitted in a kind of path OTPA based on improvement heavy phase dry analysis of the invention, is included the following steps,
Step 1, it chooses and analyzes mechanical system reference point response signal X1,X2,...,XkCrosstalk reduction is carried out to handle to obtain
Incoherent purified signal X two-by-two11,X22,...,Xkk；
Step 2, each reference point response signal X after cutting down crosstalk11,X22,...,XkkAnd target point response signal Y
Its auto-power spectrum is asked to obtain respectively
Step 3, each reference point response signal X after crosstalk being cut down11,X22,...,XkkRespectively with target point response signal
Y is obtained as crosspower spectrum
Step 4, the normal coherent function value between each input signal of computing system and output signal, the cumulative system heavy phase that obtains are done
Functional value, i.e.,
Step 5, differentiated according to heavy phase dry analysis test criterion, if meeting criterion, can determine that system model
There is no the omissions of main transmission path, and model is accurately reliable；If being unsatisfactory for criterion, it is main to can determine that system model exists
Transmission path is omitted, and needs to improve model or rebuild.
Vibration acceleration sensor witness mark, target point response signal are all made of in step 1, step 2.
Crosstalk reduction is carried out to observation signal using traditional crosstalk cutting method based on priori transport function in step 1
Processing obtains incoherent purified signal X two-by-two11,X22,...,Xkk, k is reference point response signal quantity.
It is used in step 2 after being cut down respectively crosstalk based on AR modelling (a kind of autoregression model based on linear prediction)
Each reference point response signal and target point response signal carry out auto-power spectrum estimation, wherein model parameter use Burg algorithm
It is (a kind of to be solved by making forward and backward predict that the sum of error and mean square error are minimum with the AR model parameter for estimating reflection coefficient
Method) it solves.
Using Welch method, (adding window overlaps figure average period method, is a kind of improvement based on period map method theory in step 3
The Power Spectrum Estimation Method) crosstalk is cut down after each reference point response signal respectively with target point response signal carry out crosspower spectrum
Estimation, wherein carrying out Welch method cross-power spectrum estimation by 2:1 Overlapping Fragment.
Normal coherent function value after crosstalk is cut down in step 4 between i-th of reference point response signal and target point response signal
For
When each input signal of system is irrelevant two-by-two in step 4, heavy phase dry analysis is made to system, the dry functional value of heavy phase is
The normal coherent function value of each input signal of system and output signal and, i.e.,Wherein k is reference point response signal quantity.
Heavy phase dry analysis test criterion in step 5 are as follows: if the dry functional value of heavy phase is substantially met in basic frequency and nearbyIt can determine that and meet test criterion, be otherwise judged to being unsatisfactory for test criterion.
The present invention acquires reference point under operating condition of test and responds according to analyzing mechanical system structure design operating condition of test
Signal and target point response signal, are omitted or misjudgment phenomenon for the transmission path being likely to occur during OTPA model foundation,
Model is cut down using crosstalk and handles to obtain purified signal mutually incoherent two-by-two to observation signal progress crosstalk reduction, by each
Input signal and output signal carry out weight Coherence Function Analysis, differentiate whether its coherence meets test criterion, examine if meeting
Criterion, shows that model is accurate and reliable, needs to improve model or rebuild if being unsatisfactory for.The present invention is in design shell structure examination
It tests during operating condition, transport mechanism is vibrated according to shell structure mechanical system, shell structure testing stand is divided into two-stage transmitting
Path system.Choosing analyzed mechanical system, to close on path structure connecting component position as a reference point, outside selection shell structure
As target point, reference point number is identical as number of paths at surface any point, and operating condition of test quantity is more than or equal to reference
Twice of point quantity.Two motors are opened simultaneously operates and acquire vibration response signal under different rotating speeds with different rotating speeds respectively,
Crosstalk reduction is carried out to reference point response signal and handles to obtain purified signal mutually incoherent two-by-two, respectively to the first order, second
Grade transmission path system carries out the dry analysis of complete trails heavy phase, carries out discriminating whether to meet condition using test criterion, verifies model
Reliability；Omit to the first order, the second level transmission path system heavy phase dry analysis of respective paths respectively, it is quasi- using examining
It then carries out differentiating and comparing with complete trails heavy phase dry analysis result, verifies the validity and advantage of the method for the present invention.
Preferred embodiment, to illustrate to omit the validity of the method for inspection, design based on the path OTPA for improving heavy phase dry analysis
Shell structure testing stand two-stage transmission path system.Two-stage transmission path system is carried out to shell structure mechanical system to be analyzed to build
Mould, model three-dimensional figure is shown in Figure 1, and design experiment investigation and comparison omits the heavy phase dry analysis inspection knot in the case of respective paths
Fruit.
Shell structure testing stand is mainly by plate shell combined structure, eccentric block vibrating motor, motor support vibration-proof structure, bracket
Four parts composition.Two machine governors control two eccentric block vibrating motors as two mutually independent driving sources respectively.
Test signal is acquired by COCO80 data collecting instrument, and sample frequency is set as 1600Hz, and test sampling duration is set as every time
10s。
Two motors are opened simultaneously to operate respectively with different rotating speeds, and each reference point response signal collected is gone here and there
It disturbs reduction and obtains purified signal mutually incoherent two-by-two, complete trails weight is carried out to the first order, second level transmission path system respectively
Coherence analysis is carried out discriminating whether to meet condition using test criterion, verifies the reliability of the adjustment model；Respectively to the first order, the second level
Transmission path system omit the heavy phase dry analysis of respective paths, differentiate using test criterion and do with complete trails heavy phase
Analysis result compares.
Fig. 2 show first order transmission path system complete trails reference point signal to dry point of the heavy phase of target point response signal
Analysis is as a result, red dotted line indicates to examine discrimination standard.Heavy phase dry analysis functional value is being sentenced in basic frequency and its neighbouring substantially meet
On other benchmark, that is, substantially meetIt is accurate to show first order transmission path system modelling.
Fig. 3 show 1 reference point signal of first order transmission path system path to dry point of the heavy phase of target point response signal
Analysis is unsatisfactory for as a result, heavy phase dry analysis functional value is unsatisfactory on discrimination standard in basic frequency and its nearbyShow the validity that this method is examined when model omits path 2.
Fig. 4 show 2 reference point signal of first order transmission path system path to dry point of the heavy phase of target point response signal
Analysis is unsatisfactory for as a result, heavy phase dry analysis functional value is unsatisfactory on discrimination standard in basic frequency and its nearbyShow the validity that this method is examined when model omits path 1.
Fig. 5 show second level transmission path system complete trails reference point signal to dry point of the heavy phase of target point response signal
Analysis is as a result, red dotted line indicates to examine discrimination standard.Heavy phase dry analysis functional value is being sentenced in basic frequency and its neighbouring substantially meet
On other benchmark, that is, substantially meetIt is accurate to show second level transmission path system modelling.
It is respectively second level transmission path system path 3, path 4, path 5, path shown in Fig. 6 a, Fig. 6 b, Fig. 6 c, Fig. 6 d
The heavy phase dry analysis of 6 pairs of target point response signals is as a result, heavy phase dry analysis functional value is unsatisfactory for sentencing in basic frequency and its nearby
On other benchmark, that is, it is unsatisfactory forIt shows this method and omits remaining in second level transmission path system model
The validity examined in the case of corresponding 3 transmission paths.
In the case of the shown respectively second level transmission path system omission path 3 Fig. 7 a, Fig. 7 b, Fig. 7 c, Fig. 7 d, omit road
In the case of diameter 4, in the case of omitting path 5, omit in the case of path 6 to the heavy phase dry analysis of target point response signal as a result, weight
Coherence analysis functional value is unsatisfactory on discrimination standard in basic frequency and its nearby, that is, is unsatisfactory forShow
The validity that this method is examined when second level transmission path system model omits any one transmission path.
Claims (8)
1. a kind of omit the method for inspection based on the path OTPA for improving heavy phase dry analysis, which is characterized in that include the following steps,
Step 1, it chooses and analyzes mechanical system reference point response signal X1,X2,...,XkCrosstalk reduction is carried out to handle to obtain two-by-two
Incoherent purified signal X11,X22,...,Xkk；
Step 2, each reference point response signal X after cutting down crosstalk11,X22,...,XkkAnd target point response signal Y difference
Its auto-power spectrum is asked to obtain
Step 3, each reference point response signal X after crosstalk being cut down11,X22,...,XkkMake respectively with target point response signal Y
Crosspower spectrum obtains Sx11y(f),Sx22y(f),...,Sxkky(f)；
Step 4, the normal coherent function value between each input signal of computing system and output signal, it is cumulative to obtain system weight coherent function
Value, i.e.,
Step 5, differentiated according to heavy phase dry analysis test criterion, if meeting criterion, can determine that system model is not deposited
It is omitted in main transmission path, model is accurately reliable；If being unsatisfactory for criterion, it can determine that system model has main transmitting
Path is omitted, and needs to improve model or rebuild.
2. according to claim 1 a kind of based on the path the OTPA omission method of inspection for improving heavy phase dry analysis, feature
It is, vibration acceleration sensor witness mark, target point response signal is all made of in step 1, step 2.
3. according to claim 1 a kind of based on the path the OTPA omission method of inspection for improving heavy phase dry analysis, feature
It is, observation signal is carried out at crosstalk reduction using traditional crosstalk cutting method based on priori transport function in step 1
Reason obtains incoherent purified signal X two-by-two11,X22,...,Xkk, k is reference point response signal quantity.
4. according to claim 1 a kind of based on the path the OTPA omission method of inspection for improving heavy phase dry analysis, feature
It is, using each reference point response signal and target point response signal after being cut down respectively crosstalk based on AR model in step 2
Auto-power spectrum estimation is carried out, AR model is the autoregression model based on linear prediction；Wherein model parameter is asked using Burg algorithm
Solution, Burg algorithm are by making forward and backward predict the minimum AR model to estimate reflection coefficient of the sum of error and mean square error
Parametric solution method.
5. according to claim 1 a kind of based on the path the OTPA omission method of inspection for improving heavy phase dry analysis, feature
It is, each reference point response signal after being cut down crosstalk using Welch method in step 3 is carried out with target point response signal respectively
Cross-power spectrum estimation, wherein carrying out Welch method cross-power spectrum estimation by 2:1 Overlapping Fragment；Welch method is adding window overlapping average week
Phase figure method.
6. according to claim 1 a kind of based on the path the OTPA omission method of inspection for improving heavy phase dry analysis, feature
It is, the normal coherent function value after crosstalk is cut down in step 4 between i-th of reference point response signal and target point response signal is
7. according to claim 6 a kind of based on the path the OTPA omission method of inspection for improving heavy phase dry analysis, feature
It is, when each input signal of system is irrelevant two-by-two in step 4, heavy phase dry analysis is made to system, the dry functional value of heavy phase is to be
The normal coherent function value of each input signal of uniting and output signal and, i.e.,
Wherein k is reference point response signal quantity.
8. according to claim 1 a kind of based on the path the OTPA omission method of inspection for improving heavy phase dry analysis, feature
It is, heavy phase dry analysis test criterion in step 5 are as follows: if the dry functional value of heavy phase is substantially met in basic frequency and nearbyIt can determine that and meet test criterion, be otherwise judged to being unsatisfactory for test criterion.
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| CN112033684A (en) * | 2020-09-15 | 2020-12-04 | 中国航发沈阳发动机研究所 | Method for identifying vibration contribution degree of excitation point to response point |
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| CN112651354B (en) * | 2020-12-29 | 2023-09-19 | 潍柴动力股份有限公司 | Method and device for determining noise source |
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