System and method for measuring time-sharing quick steady-state sine sweep excitation frequency response function

Abstract

The invention relates to a system and a method for measuring time-sharing quick steady-state sine sweep excitation frequency response function, which belong to the technical field of vibration tests. An excitation system adopts a vibration exciter and a power amplifier. A force sensor and a vibration sensor are adopted to measure an exciting force signal and a vibratory response signal of the system at the same time. A charge amplifier is adopted to condition and filter the signals. A data acquisition system connects a data acquisition card with a connecting terminal through a high-performance shielded cable and is connected with a general computer to acquire and send data. The generation of a sweep signal and the data processing, analysis, storage and display of an exciter response signal are achieved by adopting software based on the general computer. The system and the method achieve quick steady-state sine sweep excitation, the complete cycle sampling of the exciter response signal, and precise and reliable frequency response function curve. The test system is guided by computer programs and is finished automatically, the test method is precise and reliable, and the system and the method have important meaning on testing the dynamic properties of structural elements.

Description

technical field [0001] The invention relates to a time-sharing fast steady-state sine frequency sweep excitation frequency response function measurement system and method, belonging to the technical field of vibration testing. Background technique [0002] The dynamic characteristics of a vibration system can be described by the frequency response function. Suppose the excitation signal acting on the vibration system is the input function x(t), and the output function y(t) is the response signal of the vibration system to the excitation, then the frequency response function is: [0003] H ( f ) = Y ( f ) X ( f ) - - - ( 1 ) ...

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Problems solved by technology

[0023] The purpose of the present invention is to overcome the shortcomings of the existing vibration test system that the accuracy, efficiency and equipment cannot be combined, and propose a new vibration test method-time-sharing rapid steady-state sine sweep frequency excitation frequency response function measurement technology , and developed a time-sharing fast steady-state sine sweep excitation frequency response function measurement test system

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