CN104236829A - Method for detecting very-fragile part uncoupling interface frequency response function - Google Patents
Method for detecting very-fragile part uncoupling interface frequency response function Download PDFInfo
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- CN104236829A CN104236829A CN201410460690.9A CN201410460690A CN104236829A CN 104236829 A CN104236829 A CN 104236829A CN 201410460690 A CN201410460690 A CN 201410460690A CN 104236829 A CN104236829 A CN 104236829A
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- frequency response
- response function
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Abstract
The invention discloses an obtaining method of a very-fragile part uncoupling interface frequency response function and belongs to the field of mechanical vibration. The method is mainly characterized in that according to a measured additional part frequency response function HBcc and assembled system frequency response functions HABcc, HABic and HABcii, the method comprises the following steps that (1) an acceleration sensor is arranged for an additional part, and the frequency response function HBcc of the acceleration sensor is measured; (2) a very-fragile part and the additional part are in rigid connection, a sensor is arranged for an assembled system, and the assembled system frequency response functions HABcc, HABic and HABcii are measured; and (3) according to the measured frequency response function of the additional part and the frequency response functions of the assembled system, the very-fragile part uncoupling interface frequency response function is directly computed. The very-fragile part uncoupling interface frequency response function is predicted based on the measured frequency response functions completely through the method, direct shock excitation or pick-up vibration on the very-fragile part is of no need, and the advantages such as construction application easiness and high accuracy are achieved.
Description
Technical field
The present invention relates to the technical field of mechanical vibration, especially relate to the acquisition methods of a kind of extremely crisp parts non-coupled interface frequency response function.
Background technology
Frequency response function is an important indicator of the dynamic mass assessment of engineering goods.In addition, when carrying out dynamic mass analysis to the assembly system of complexity, the general frequency response function being obtained all parts by method that is theoretical or experiment test, then carries out the dynamic perfromance of Substructure Synthesis acquisition total system.But the parts extremely fragile to some, its frequency response function is difficult to directly test by experiment, and the precision of theoretical modeling method is limited by the accuracy of model parameter and boundary condition.Acquisition for the extremely frequency response function of vulnerable component becomes the new hot fields of of modern mechanical vibration field.
Summary of the invention
The object of the present invention is to provide that a kind of engineer applied is convenient, measuring accuracy is high, without the need to direct method of testing that carry out exciting or pick-up to extremely crisp parts, that indirectly obtain extremely crisp parts non-coupled interface frequency response function.
The invention provides the method for testing for extremely crisp parts non-coupled interface frequency response function, it is characterized in that: first by the additional parts easily measured, make use of the frequency response function of assembly system and the frequency response function of optional feature that can be easy to measure, predict the frequency response function of extremely crisp parts, avoid and direct excited vibration and pick-up are carried out to extremely crisp parts, comprise the steps:
(1) acceleration transducer is arranged to optional feature B, measure its frequency response function H
bcc;
(2) extremely crisp parts and optional feature are rigidly connected, to the system assembled, placement sensor, measures the frequency response function H of assembly system
aBcc, H
aBic, H
aBii;
(3) according to the frequency response function of optional feature recorded and the frequency response function of assembly system, the frequency response function of extremely crisp parts is calculated.Computing formula is as follows:
H
Acc＝H
ABcc(I
cc-(H
Bcc)
-1H
ABcc)
-1
(4) frequency response function from interface degree of freedom to internal degree of freedom of extremely crisp parts is calculated.Computing formula is as follows:
H
Aic＝H
ABic{I
cc-(H
Acc+H
Bcc)
-1H
Acc}
-1
(5) the initial point admittance of the internal degree of freedom of extremely crisp parts is calculated.Computing formula is as follows:
H
Aii＝H
ABii+H
Aic(H
Acc+H
Bcc)
-1H
Aic
The present invention compared with prior art, has remarkable advantage:
(1) do not need extremely crisp parts exciting or pick-up.
(2) frequency response function of the assembly system required for formula of non-coupled interface frequency response function and the frequency response function of optional feature that calculate extremely crisp parts are obtained by experiment test completely, avoid FEM (finite element) calculation or theoretical modeling to the dependence of model accuracy.
Accompanying drawing explanation
The extremely crisp parts check point schematic diagram that Fig. 1 is to be predicted.
Fig. 2 optional feature check point schematic diagram.
Fig. 3 assembly system check point schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
The method that the present invention measures extremely crisp parts non-coupled interface frequency response function comprises the following steps:
(1) according to boundary geometrical condition and the physical condition of extremely crisp components A (Fig. 1) to be measured, suitable optional feature B is selected;
(2) optional feature B arranges acceleration transducer, measures its frequency response function H
bcc(Fig. 2);
(3) extremely crisp parts and optional feature are rigidly connected, to the system assembled, placement sensor, measures the frequency response function H of assembly system
aBcc, H
aBic, H
aBii(Fig. 3);
(4) according to the frequency response function of optional feature recorded and the frequency response function of assembly system, the frequency response function of extremely crisp parts is directly calculated.Computing formula is as follows:
H
Acc＝H
ABcc(I
cc-(H
Bcc)
-1H
ABcc)
-1。
(5) frequency response function from interface degree of freedom to internal degree of freedom of extremely crisp parts is calculated.Computing formula is as follows:
H
Aic＝H
ABic{I
cc-(H
Acc+H
Bcc)
-1H
Acc}
-1
(6) the initial point admittance of the internal degree of freedom of extremely crisp parts is calculated.Computing formula is as follows:
H
Aii＝H
ABii+H
Aic(H
Acc+H
Ｂcc)
-1H
Aic
Subscript "-1 " representing matrix inversion operation in formula, I representation unit matrix.
Above-mentioned (2), (3) measurement of step medium frequency response function can be obtained by simple ripe " exciting test ", complete by " power hammer-accelerometer-multi-channel signal acquiring analytic system " hardware testing system, this system is public physical construction kinetic test analytic system, mainly comprise the power hammer of exciting, one group of sensor-accelerometer of vibratory response test, and multi-channel signal acquiring analytic system, as domestic DASP intelligent signal energy acquisition processing system, 16 or 32 passages, external as LMS, the systems such as BK, multi-channel signal acquiring analyser is primarily of advance signal regulator, (time-frequency Dynamic Signal reads for analog to digital converter and software kit, analyze, display, export, the functions etc. such as printing).
Above-described embodiment is the embodiment that the present invention recommends; but embodiments of the present invention are not restricted to the described embodiments; the amendment made under other any does not deviate from core essence of the present invention and principle, substitute, combination, simplify the substitute mode that all should be equivalence, be included within protection scope of the present invention.
Claims (4)
1. measure a method for extremely crisp parts non-coupled interface frequency response function, it is characterized in that, comprise the steps:
(1) acceleration transducer is arranged to optional feature, measure its frequency response function H
bcc;
(2) extremely crisp parts and optional feature are rigidly connected, to the system assembled, placement sensor, measures the frequency response function H of assembly system
aBcc, H
aBic, H
aBii;
(3) according to the frequency response function of optional feature recorded and the frequency response function of assembly system, the frequency response function of extremely crisp parts is calculated.Computing formula is as follows:
H
Acc＝H
ABcc(I
cc-(H
Bcc)
-1H
ABcc)
-1
(4) frequency response function from interface degree of freedom to internal degree of freedom of extremely crisp parts is calculated.Computing formula is as follows:
H
Aic＝H
ABic{I
cc-(H
Acc+H
Bcc)
-1H
Acc}
-1
(5) the initial point admittance of the internal degree of freedom of extremely crisp parts is calculated.Computing formula is as follows:
H
Aii＝H
ABii+H
Aix(H
Acc+H
Bcc)
-1H
Aic。
2. the method for according to claim 1-kind of mensuration extremely crisp parts non-coupled interface frequency response function, it is characterized in that, the frequency response function of described measurement comprises: the frequency response function H of optional feature
bccwith the frequency response function H of assembly system
aBcc, H
aBic, H
aBii.
3. the method for a kind of mensuration according to claim 2 extremely crisp parts non-coupled interface frequency response function, is characterized in that, do not need to carry out exciting or pick-up to extremely crisp parts.
4. the method for a kind of mensuration according to claim 2 extremely crisp parts non-coupled interface frequency response function, it is characterized in that, the computing formula of extremely crisp components interior degree of freedom initial point admittance is
H
Aii＝H
ABii+H
Aic(H
Acc+H
Bcc)
-1H
Aic。
Priority Applications (1)
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410460690.9A CN104236829A (en) | 2014-09-11 | 2014-09-11 | Method for detecting very-fragile part uncoupling interface frequency response function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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Family
ID=52225348
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|---|---|---|---|
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| JP2011027669A (en) * | 2009-07-29 | 2011-02-10 | Hitachi Plant Technologies Ltd | Device and method for testing vibration |
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Application publication date: 20141224 |
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