CN106323574A - Method for assessing influence of vibration of active device on vehicle body structure - Google Patents

Method for assessing influence of vibration of active device on vehicle body structure Download PDF

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Publication number
CN106323574A
CN106323574A CN201610666710.7A CN201610666710A CN106323574A CN 106323574 A CN106323574 A CN 106323574A CN 201610666710 A CN201610666710 A CN 201610666710A CN 106323574 A CN106323574 A CN 106323574A
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vibration
active equipment
vehicle body
signal
appraisal procedure
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CN106323574B (en
Inventor
王永胜
臧晓斌
丁杰
葛会军
李碧钰
饶沛南
赵清良
刘海涛
李华
程超龙
孙立辉
刘清
刘长清
王明
解培金
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Zhuzhou CRRC Times Electric Co Ltd
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Zhuzhou CRRC Times Electric Co Ltd
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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
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/08—Railway vehicles

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The invention discloses a method for assessing the influence of vibration of an active device on a vehicle body structure. The method comprises the following steps: S01) obtaining a transfer function G'(s)n of each channel vibration signal from a test bench installation interface to a vehicle body installation interface, and obtaining a transfer function G3(s)n of each channel vibration signal from the vehicle body installation interface to a vehicle body internal structure; S02) obtaining each channel vibration signal Y1(t)n through test bench vibration test and obtaining an input signal Y1(s)n, and obtaining each channel vibration output signal Y3(s)n of the vehicle body internal structure; S03) obtaining a corresponding time-domain signal Y3(t)n through conversion of the vibration output signal Y3(s)n of the vehicle body internal structure, and carrying out calculation to obtain a vibration evaluation value samples Y3n; and S04) carrying out averaging on the vibration evaluation value samples Y3n to obtain a vibration evaluation pre-estimated value Y3 to judge whether the vibration of the active device reaches the standard. The method for assessing the influence of vibration of the active device on the vehicle body structure has the advantages of convenient test and being accurate and high in efficiency and the like.

Description

A kind of active equipment vibration appraisal procedure on body construction impact
Technical field
The invention mainly relates to technical field of rail traffic, refer in particular to a kind of active equipment vibration commenting body construction impact Estimate method.
Background technology
Modern motor-car, subway major part are to use power decentralized type car group, wherein for car properly functioning offer power, electricity The capital equipment of the function such as power and ventilation is typically all suspended on vehicle bottom (being also partially disposed on roof), these equipment In there is obvious vibration source (such as transformator, blower fan etc.) such as tractive transformer, air interchanger and part current transformer etc. due to inside It is also called active equipment.These active equipments are suspended on vehicle bottom (or being placed on roof), and its vibration produced can pass through car Body is delivered to inside and causes the structural vibrations such as floor, will have a strong impact on ride comfort when vibrating excessive.
Currently, either main engine plants or equipment supplier vibrate to motor-car, Subway Body internally for active equipment The assessment of the structure influences such as plate is mainly verified by entrucking.Although this method is intuitively effective, but have the disadvantage in that 1, nothing Method assesses the active equipment vibration impact on car body in advance, and once the vibration of entrucking aftercarriage is excessive, then improve difficulty and required one-tenth This is relatively big, and batch vibration problem easily occurs；2, assessment cannot be completed in manufacturer workshop or laboratory to active equipment Type selecting in terms of vibration performance compares blindly, passively.
Summary of the invention
The technical problem to be solved in the present invention is that the technical problem existed for prior art, and the present invention provides one Plant convenient test and the appraisal procedure on body construction impact of the active equipment vibration accurately.
For solving above-mentioned technical problem, the technical scheme that the present invention proposes is:
A kind of active equipment vibration appraisal procedure on body construction impact, comprises the following steps:
S01, obtain each passage vibration signal transmission function G' from testboard bay mounting interface to car body mounting interface (s)n, and each passage vibration signal is from the transmission function G of car body mounting interface to vehicle body structure3(s)n；
S02, obtain each passage vibration signal Y by testboard bay vibration-testing1(t)n, to obtain input signal Y1(s)n, And utilize formula (1) to obtain each passage vibration output signal Y of vehicle body structure3(s)n,
Y3(s)n=Y1(s)n×G'(s)n×G3(s)n (1)；
S03, vibration output signal Y by vehicle body structure3(s)nConversion obtains the time-domain signal Y of correspondence3(t)n, meter Calculation obtains evaluation of vibration value sample
S04, to evaluation of vibration value sampleAverage, obtain evaluation of vibration discreet value Y3, to judge that active equipment shakes Dynamic the most up to standard.
Preferably, in step S01, obtain G'(s by sample test)nAnd G3(s)n。
Preferably, in step S04, spatial pattern and process is used to reject evaluation of vibration value sampleIn exceptional value, then take Meansigma methods.
Preferably, in step S02, Y1(t)nInput signal Y is obtained by Laplace transformation1(s)n。
Preferably, in step S03, Y3(s)nY is obtained by Laplace Transform3(t)n, and be calculated by virtual value Evaluation of vibration value sample
Preferably, in step S01, vehicle body structure includes that car body floor, assessment content include the one of car body floor Vibration under individual or two characteristic frequencyes.
Preferably, active equipment includes tractive transformer, AuCT and air interchanger.
Preferably, described characteristic frequency is 100Hz.
Compared with prior art, it is an advantage of the current invention that:
The active equipment vibration of the present invention appraisal procedure on body construction impact, by by active equipment workshop or experiment Vibration engine bench test in room regards approximately continuous virtual system as with actual entrucking two discontinuous systems of room and time of test, The multichannel utilizing actual measurement or emulation to obtain transfers function to assess active equipment and vibrates motor-car, the shadow of subway internal structure Ring；The assessment to active equipment vibration can be completed, to instruct the vibrating mass such as transformator, blower fan to select in workshop or laboratory Type and avoid high-volume entrucking vibration fault appearance, there is higher using value and there is higher accuracy.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the present invention.
Fig. 2 is the structure chart of the testboard bay vibration test system in the present invention.
Fig. 3 is the structure chart of the entrucking vibration test system in the present invention.
Fig. 4 is the transfer principle figure of testboard bay vibration test system in the present invention.
Fig. 5 is the transfer principle figure of entrucking vibration test system in the present invention.
Fig. 6 is the vibration transfer principle figure in the present invention between multiple systems.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Figures 1 to 6, the active equipment of the present embodiment vibration appraisal procedure on body construction impact, including with Lower step:
S01, obtain each passage vibration signal transmission function G' from testboard bay mounting interface to car body mounting interface (s)n, and each passage vibration signal is from the transmission function G of car body mounting interface to vehicle body structure3(s)n；
S02, obtain each passage vibration signal Y by testboard bay vibration-testing1(t)n, to obtain input signal Y1(s)n, And utilize formula (1) to obtain each passage vibration output signal Y of vehicle body structure3(s)n,
Y3(s)n=Y1(s)n×G'(s)n×G3(s)n (1)；
S03, vibration output signal Y by vehicle body structure3(s)nConversion obtains the time-domain signal Y of correspondence3(t)n, meter Calculation obtains evaluation of vibration value sample
S04, to evaluation of vibration value sampleAverage, obtain evaluation of vibration discreet value Y3, to judge that active equipment shakes Dynamic the most up to standard.
The active equipment vibration of the present invention appraisal procedure on body construction impact, by by active equipment workshop or experiment Vibration engine bench test in room regards approximately continuous virtual system as with actual entrucking two discontinuous systems of room and time of test, The multichannel utilizing actual measurement or emulation to obtain transfers function to assess active equipment and vibrates motor-car, the shadow of subway internal structure Ring；The assessment to active equipment vibration can be completed, to instruct the vibrating mass such as transformator, blower fan to select in workshop or laboratory Type and avoid high-volume entrucking vibration fault appearance, there is higher using value and there is higher accuracy.
Concrete, the appraisal procedure of the present invention can the isostructural vibration of active equipment and floor mainly for motor-car, subway Feature proposes, and relates to two main test systems, i.e. active equipment at workshop or laboratory bench vibration test system and dress Car vibration test system, the most as shown in Figures 2 and 3.Wherein Fig. 2 be active equipment (as tractive transformer, AuCT, Air interchanger etc.) at the stand vibration test system of workshop or test chamber, X in this system1T () is that vibration source is (such as transformator, wind Mechanical, electrical machine etc.) vibration signal that exports, Y1(t)nIt is that vibrating sensor is in active equipment and testboard bay mounting interface position The vibration signal recorded, wherein n for test signalling channel number (n=1,2 ..., m；M is total number of channels), this system is entered Row vibration-testing has a following requirement:
(1) test system simulation active equipment actual entrucking state, such as lifting, A seating installation etc.；
(2) hanger Interface status is installed and keeps consistent, as bolt fixed end taken about the point of fixation to keep unified, and with entrucking state one Cause；
(3) testboard bay structure is unified, fixing, and testboard bay vertical stiffness is tried one's best close with car body vertical stiffness；
(4) active equipment keeps consistent in testboard bay installation site.
Fig. 3 is active equipment (such as tractive transformer, AuCT, air interchanger etc.) entrucking vibration test system, with X in sample system1T () is the vibration signal that vibration source (such as transformator, blower fan, motor etc.) exports；Y2(t)nIt is that vibrating sensor is having The vibration signal that source device records with car body mounting interface position, wherein n for test signalling channel number (n=1,2 ..., m； M is total number of channels)；Y3T () is floor in a vehicle isostructural evaluation of vibration point (typically selecting the position that body-sensing vibration is the strongest).Right Carry out vibration-testing in this system and have a following requirement:
(1) hanger Interface status is installed and keeps consistent, as bolt fixed end taken about the point of fixation to keep unified；
(2) vibration point position and order and stand vibrate point position and sequence consensus.
In addition to requirements above, the operating condition of two system active equipment also to keep consistent.
Two systems in Fig. 2 and Fig. 3 are the most all discontinuous, it is assumed that two systems are to vibration transmission For be linear, then two system vibration transmittance process can be indicated with Fig. 4 and Fig. 5 respectively:
X in Fig. 4, Fig. 51(s)、Y1(s)n、Y2(s)n、Y3(s)nIt is signal X respectively1(t)、Y1(t)n、Y2(t)n、Y3(t)nWarp Obtain after Laplace transformation, G1(s)n、G2(s)n、G3S () n is input signal X respectively1S () arrives output signal Y1(s)n, input signal X1S () arrives output signal Y2(s)n, input signal Y2(s)nTo output signal Y3(s)nVibration transfer function.Correlation formula is done Hereinafter derive:
G 1 ( s ) n = Y 1 ( s ) n X 1 ( s ) , G 2 ( s ) n = Y 2 ( s ) n X 1 ( s )
Can obtain according to formula above:Order:I.e. it is believed that G'(s)nFor each logical Road signal is from the transmission function of testboard bay mounting interface to car body mounting interface.Due to two systems the most not Continuously, a virtual system can be introduced by two system approximation serializations, G'(s)nTransmission letter for this virtual system Number.So test entrucking test from active equipment workshop or laboratory bench and just constitute a set of continuous print system (such as Fig. 6 institute Show).This system transter is obtained, it is possible to utilize workshop or test chamber test data to complete active by test or emulation The vibration equipment approximate evaluation to structure influences such as motor-car, Subway Body interior floor.
In the present embodiment, in step S01, transmit function G'(s)nAnd G3S the acquisition of () n mainly has a three approach: 1, sample Product test obtains；2, obtained by the test data of similar installation approach with body construction；3, simulation calculation obtains.
In the present embodiment, in step S04, spatial pattern and process is used to reject evaluation of vibration value sampleIn exceptional value, Average again.In step S02, Y1(t)nInput signal Y is obtained by Laplace transformation1(s)n.In step S03, Y3(s)n Y is obtained by Laplace Transform3(t)n, and it is calculated evaluation of vibration value sample by virtual value
In the present embodiment, it is special that the vibrometer that on motor-car, subway, major part active equipment produces reveals more stable frequency domain Levy, be usually the multiple of supply frequency (such as 50Hz, 100Hz, 200Hz such as transformator due to its frequency of vibration of magnetostrictive effect Deng), the frequency of vibration that causes of blower fan and motor is general and rotating speed strong correlation.And the structure such as motor-car, Subway Body interior floor is subject to Active equipment excites the vibration of generation mainly to show several feature: (1) frequency is more stable, is the feature frequency of active equipment Rate；(2) vibration is concentrated mainly on low frequency (within 400Hz), and human body is also low frequency to vibration sensing frequency.Therefore, to active The assessment of vibration equipment impact is primarily directed to some or two characteristic frequencyes of its low frequency region, such as the 100Hz of transformator, Blower fan, the 1st rank of motor turn frequency or blade passing frequency etc..
When assessing the vibration values that content is primarily upon under one or two frequency of the structures such as car body floor (such as 100Hz), Transmission function in appraisal procedure flow process can only calculate the value under this frequency, dependent evaluation flow process and computational methods can be carried out accordingly Simplify.Illustrate with a specific embodiment below:
On-the-spot experimental test shows, the vibration of certain active equipment is mainly manifested in 100Hz to subway floor impact, therefore, for Simplify and calculate, can only assess the magnitude of vibrations of 100Hz.
The first step: obtain ssystem transfer function.
Virtual system (testboard bay is installed to car body and installs) transmission function G'(s is obtained) by actual measurementnWidth at 100Hz Value is such as following table, altogether 12 signalling channels:
Port number 1 2 3 4 5 6 7 8 9 10 11 12
Amplitude 0.715 0.122 3.426 0.664 0.07 1.153 1.132 0.08 0.853 0.903 0.106 0.48
The transmission function G of system (car body mounting interface is to structures such as floor in a vehicle) is obtained by actual measurement3S () n is at 100Hz Amplitude such as following table, 12 passages altogether:
Port number 1 2 3 4 5 6 7 8 9 10 11 12
Amplitude 13.14 33.68 2.8 12 34.2 3.26 14.8 22.9 2.83 8.79 16.4 3.152
Second step: obtain workshop or the vibration signal Y of laboratory bench 12 passages of each interface by test1(t)n。
3rd step: obtain the input signal Y needed for calculation of transfer function by Mathematical treatment (such as Laplace transformation)1(s)n, as Following table.
Port number 1 2 3 4 5 6 7 8 9 10 11 12
Amplitude 0.025 0.04 0.027 0.026 0.027 0.007 0.035 0.03 0.008 0.029 0.018 0.071
4th step: utilize vibration transmission computing formula (1), is calculated the vibration output letter of each transmission channels of floor in a vehicle Number Y3(s)n, 100Hz amplitude such as following table:
Port number 1 2 3 4 5 6 7 8 9 10 11 12
Amplitude 0.239 0.165 0.258 0.203 0.065 0.026 0.588 0.057 0.022 0.236 0.032 0.107
4th step: by each multi-channel output signal Y3(s)nCarry out Laplace Transform and obtain floor time-domain signal Y3(t)n, And calculate the virtual value at 100Hz:
Port number 1 2 3 4 5 6 7 8 9 10 11 12
Virtual value 0.169 0.118 0.182 0.145 0.047 0.019 0.416 0.04 0.015 0.167 0.023 0.076
5th step: each passage virtual value sample is carried out statistical disposition, removes some due to test, assembling equal error generation Unreasonable data after average, obtain evaluation of vibration discreet value Y3For 0.12m/s2.Therefore, the vibration of this active equipment is up to standard (concrete appraisal procedure can refer to GB/T 13441 and test experience is carried out, it is proposed that Y3(0-200Hz) less than 0.3m/s2It is vibration Up to standard.).Measured result and this error calculated are about 7%, and its assessment result is more accurate.
Below being only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for the art For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, should be regarded as the protection of the present invention Scope.

Claims (8)

1. the appraisal procedure that body construction is affected by an active equipment vibration, it is characterised in that comprise the following steps:
S01, obtain each passage vibration signal transmission function G'(s from testboard bay mounting interface to car body mounting interface)n, with And each passage vibration signal is from the transmission function G of car body mounting interface to vehicle body structure3(s)n；
S02, obtain each passage vibration signal Y by testboard bay vibration-testing1(t)n, to obtain input signal Y1(s)n, and profit Each passage vibration output signal Y of vehicle body structure is obtained with formula (1)3(s)n,
Y3(s)n=Y1(s)n×G'(s)n×G3(s)n (1)；
S03, vibration output signal Y by vehicle body structure3(s)nConversion obtains the time-domain signal Y of correspondence3(t)n, it is calculated Evaluation of vibration value sample
S04, to evaluation of vibration value sample Y3nAverage, obtain evaluation of vibration discreet value Y3, to judge that active equipment vibration is No up to standard.
The active equipment the most according to claim 1 vibration appraisal procedure on body construction impact, it is characterised in that in step In rapid S01, obtain G'(s by sample test)nAnd G3(s)n。
The active equipment the most according to claim 1 and 2 vibration appraisal procedure on body construction impact, it is characterised in that In step S04, spatial pattern and process is used to reject evaluation of vibration value sample Y3nIn exceptional value, then average.
The active equipment the most according to claim 1 and 2 vibration appraisal procedure on body construction impact, it is characterised in that In step S02, Y1(t)nInput signal Y is obtained by Laplace transformation1(s)n。
The active equipment the most according to claim 1 and 2 vibration appraisal procedure on body construction impact, it is characterised in that In step S03, Y3(s)nY is obtained by Laplace Transform3(t)n, and it is calculated evaluation of vibration value sample by virtual value Y3n。
The active equipment the most according to claim 1 and 2 vibration appraisal procedure on body construction impact, it is characterised in that In step S01, vehicle body structure includes that car body floor, assessment content include one or two characteristic frequency of car body floor Under vibration.
The active equipment the most according to claim 6 vibration appraisal procedure on body construction impact, it is characterised in that active Equipment includes tractive transformer, AuCT and air interchanger.
The active equipment the most according to claim 6 vibration appraisal procedure on body construction impact, it is characterised in that described Characteristic frequency is 100Hz.
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