Experimental device and method for multi-point vibration response frequency domain prediction based on transfer function

A technology of transfer function and vibration response, applied to vibration measurement, measuring device, measuring vibration and other directions in solids, can solve the problems of difficult to obtain transfer function of system modeling, difficult and impossible to measure load size, etc.

Active Publication Date: 2020-12-01
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has two major shortcomings: firstly, for complex engineering structures, it is not easy to model the system and obtain the transfer function; secondly, it is very difficult to measure the load magnitude under uncorrelated multi-source load cases, even is impossible

Method used

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  • Experimental device and method for multi-point vibration response frequency domain prediction based on transfer function
  • Experimental device and method for multi-point vibration response frequency domain prediction based on transfer function
  • Experimental device and method for multi-point vibration response frequency domain prediction based on transfer function

Examples

Experimental program
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Effect test

Embodiment 1

[0118] Example 1: Experimental device for frequency domain prediction of multi-point vibration response under unknown load conditions

[0119] Experimental device for frequency-domain prediction of multi-point vibration response under joint excitation of shaking table and hammer under the condition of unknown load, see attached figure 2. The vibration structure used in the experimental device is a beam with one end simply supported and one end fixed. The damping ratio of this structure is small, and it can be regarded as a linear system. Two irrelevant excitation sources are used, one is the vibration table excitation, and the vibration excitation input by the vibration table is recorded by the vibration sensor; the other is the PCB hammer hammer excitation, and the force excitation is recorded by the force sensor built in the hammer head . That is, the irrelevant excitation sources m=2, and the unknowns and directions of the excitation points of the vibration table and the...

Embodiment 2

[0120] Example 2: Acquisition of transfer function based on unary linear regression model under independent load excitation historical experimental data

[0121] Using multiple excitation sources to jointly generate multiple groups of uncorrelated stationary random excitations, and the magnitude gradually increases, thus realizing an uncorrelated multi-source load joint application experiment environment to obtain the transfer function of the system, the fitting diagram is shown in the attached Figure 8 shown. Such as Figure 3 to Figure 7 As shown, since the corresponding input m=2 of the system, the corresponding output n=18, and the number of sampling frequency points is 1601, the scale of the transfer function of the system is 1601×18×2. In the experiment, the excitation source includes two One, the independent spherical noise excitation source excitation, there are three kinds of magnitude excitation, and the magnitude gradually increases, namely b 1 = 3; the vibration...

Embodiment 3

[0122] Example 3: Acquisition of transfer function based on multivariate linear regression model and least square method under uncorrelated multi-source load joint excitation historical data

[0123] Using multiple excitation sources to jointly generate multiple groups of uncorrelated stationary random excitations, and the magnitude gradually increases, thus realizing an uncorrelated multi-source load joint application experiment environment to obtain the transfer function of the system, because the corresponding input m of the system =2, the corresponding output n=18, the sampling frequency point is 1601, so the scale of the transfer function of the system is 1601×18×2, in the experiment, the excitation source contains two, the independent spherical noise excitation Source excitation, there are 3 kinds of magnitude excitation, and the magnitude gradually increases, that is, b 1 = 3; the vibration excitation of the independent suspension vibration table vibrator has 5 kinds of...

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Abstract

The invention relates to an experiment device for multi-point vibration response frequency domain prediction under a condition of an unknown load, two transfer function acquisition methods and a method for predicting the frequency domain vibration response of an unknown measurement point according to the frequency domain vibration response of a known measurement point under an environment of irrelevant multisource unknown load combined excitation working condition. The method for predicting the vibration response on the basis of the transfer function and load identification comprises the following steps that: firstly, utilizing a historical load and the vibration response of the measurement point to solve transfer functions of all load points to the known measurement point and the unknown measurement point; utilizing the vibration response of the known measurement point under the environment of the working condition and the transfer function from all load points to the known measurement point, identifying an irrelevant multisource frequency domain load under the environment of the working condition; and finally, utilizing the identified irrelevant multisource frequency domain load under the environment of the working condition and the transfer function from the load to the unknown measurement point to predict the frequency domain vibration response of the unknown measurement point under the environment of the working condition. The method can be used for utilizing the frequency domain vibration response of the known measurement point to predict the frequency domain vibration response of the unknown measurement point under the situation that the irrelevant multisource unknown load is unknown.

Description

technical field [0001] The invention relates to an experimental device for frequency-domain prediction of multi-point vibration response under the condition of unknown load, two methods for obtaining transfer functions, and using the experimental device in the environment of uncorrelated multi-source unknown load joint excitation environment according to the system known measurement method. A method for predicting the frequency-domain vibration response of an unknown measuring point based on the frequency-domain vibration response of a point. Background technique [0002] With the development and progress of industry and control technology, the development of engineering structures in the fields of aerospace, ships, large machinery, bridges, etc. is becoming more and more complex, large-scale, and intelligent. Vibration is a design factor that has to be considered in mechanical design and navigation and aerospace engineering, especially in design and use, mechanical damage c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/18G06F17/11G01H1/00
CPCG01H1/00G06F17/11G06F17/18
Inventor 王成詹威张忆文赖雄鸣何霆陈叶旺洪欣
Owner HUAQIAO UNIVERSITY
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