An Experimental Method of Operational Modal Analysis Based on Pulse Excitation

A technology of pulse excitation and modal analysis, which is applied in the testing, measuring devices, instruments, etc. of machine/structural components, which can solve the problems of many average times, long data samples, and high frequency resolution.
CN104132791BActive Publication Date: 2016-09-14ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Publication Date
2016-09-14

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Abstract

An experimental method for operating modal analysis based on pulse excitation, including the following steps: 1) Select the end point of the beam as the excitation point, and use a steel hammer to implement pulse excitation on the beam; 2) Collect the reference points and response points generated after the pulse excitation Response signal; 3) Perform band-pass filtering on the collected signal; 4) Find the cross-correlation function between the reference point and the response point, and construct a matrix equation group composed of data at different sampling times of the cross-correlation function; 5) Use the matrix equation group Solve the coefficient matrix; 6) identify the poles of the system, establish the least squares error steady-state diagram, and solve the mode shape; 7) if the modal confidence criterion value is not good, select different sampling time values, and return to step 4), Until the modal confidence criterion value is within the preset reasonable interval, the modal parameters of the beam are obtained. And a pulse excitation-based operating mode analysis experimental device is provided. The invention can reduce the test intensity and time, and improve the learning effect of students.
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Description

technical field

[0001] The invention relates to the technical field of operation mode analysis, in particular to an operation mode analysis experiment method and device. Background technique

[0002] In the teaching process of engineering testing technology, mechanical vibration and other courses, adding some modal analysis experiments can stimulate students' interest in learning, mobilize students' learning enthusiasm and initiative, cultivate students' innovative ability, and greatly improve the teaching effect. Through experiments, students can gain rich perceptual knowledge, deepen students' understanding of obscure physical concepts, theorems and laws, and reduce the difficulty of students encountering problems in the process of self-study; with the help of experiments, they can explain problems vividly, concretely and intuitively, and be able to Make abstract knowledge come alive quickly.

[0003] The existing experimental modal analysis system generally consists of t...

Claims

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