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A sub-band hybrid control method for random vibration test

A technology of random vibration test and hybrid control, applied in vibration test, machine/structural component test, measurement device, etc., can solve the problem of lack of hybrid control, and achieve the effect of avoiding damage

Active Publication Date: 2022-07-12
GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

In actual engineering applications, or because of the difference in the response of each part of the test piece, it is expected that the test piece will have different test effects in each frequency band during the test, especially for some important components, it is necessary to use limit control to avoid excessive mechanical stress on the product. damage, but the prior art does not have a method for mixing control

Method used

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  • A sub-band hybrid control method for random vibration test
  • A sub-band hybrid control method for random vibration test
  • A sub-band hybrid control method for random vibration test

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] like figure 1 As shown, a random vibration test sub-band mixed control method includes the following steps:

[0031] S1. According to the random vibration test conditions, use the reference spectrum G r (f) The generation time history is x 0 (t) A random vibration self-check test is carried out with the low-level driving signal of t to excite the tested product;

[0032] S2. Measured response signal y of each control point R (t), taking n control points and m limit control points as an example, the responses of the n control points are y respectively R-C1 (t), y R-C2 (t), …, y R-Cn (t), the responses of m limit control points are respectively y R-L1 (t), y R-L2 (t), …, y R-Lm (t);

[0033] S3.

[0034] a. According to the experimental control strategy, construct sub-band control segments, each segment is defined by two points of high and low frequenci...

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Abstract

The patent of the present invention discloses a random vibration test sub-band mixed control method, especially a sub-band mixed control method with limit control, which can select different control methods in different frequency bands to realize the mixed control, and comprehensively consider the limit control The drive signal is balanced and corrected by point response; the method is suitable for random vibration environment test; the present invention first obtains the control response spectrum under the mixed control according to the sub-band control segment, and obtains the transfer function of the test system under this magnitude according to the existing technology; Comparing the response of the limit control point with the limit target parameters, the adjustment value of the drive signal is obtained; finally, the drive spectrum is corrected according to the adjustment value of the drive signal, and the equalization correction is performed until the test condition level is reached.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and in particular relates to a sub-band mixed control method for random vibration test. Background technique [0002] As an effective means to simulate the working vibration environment of the tested product, random vibration test is an important stage in the development of vibration test. In the development of test technology, different control methods have been formed, such as single-point control, multi-point control, etc., and different control methods can produce different test effects on the test piece. In practical engineering applications, or because of the difference in the response of each part of the test piece, it is expected that the test piece will have different test effects in each frequency band during the test, especially for some important parts, it is necessary to use limit control to avoid the product being subjected to excessive mechanical stress. However,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02
CPCG01M7/022
Inventor 代明香刘青林王东升田光明吴文杰彭磊李晓琳邓婷农绍宁胡勇赵怀耘杨翀朱学旺王宇飞周桐
Owner GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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