Method for noncontact measurement of boundary vibration and application of method

Abstract

The invention discloses a method for noncontact measurement of boundary vibration and an application of the method. The method comprises the following steps: firstly, a rectangular coordinates system is established in a three-dimensional space, and 2N sound pressure sensors are arranged around a measured object, and the geometric coordinate vectors of the 2N sound pressure sensors are determined; data acquisition cards are used for synchronously sampling signals of the 2N sound pressure sensors, time domain sound pressures are measured through the sound pressure sensors, and frequency domain complex sound pressures are obtained through conducting Fourier transform on the time domain sound pressure; vibration complex speeds and vibration complex sound pressures of the surfaces of discrete units can be obtained on the basis of routing calculation of frequency-domain complex sound pressures of the sound pressure sensors, and the numerical integration of structure units obtained by computer virtual discrete as well as numerical integration of acoustic boundary elements; and the sound intensity values of the structure surfaces are obtained through the vibration complex speeds and the vibration complex sound pressures of the structure surfaces to recognize the position and the strength of a sound source.

Description

technical field [0001] The invention relates to a vibration testing method, in particular to a non-contact method for measuring the boundary vibration velocity and sound pressure of a measured object, and the method can be applied to the identification of vibration and sound sources. Background technique [0002] Boundary vibrations exist in a variety of applications. At present, the measurement method of boundary vibration mainly adopts the acceleration sensor installed on the boundary surface for measurement. This measurement method belongs to contact measurement. On the one hand, because the sensor is in contact with the vibration surface and moves together, it will inevitably bring measurement errors; The sensor can only measure the local local vibration velocity, and the measurement efficiency is low. The use of eddy current or optical sensor is a non-contact measurement method, which can dynamically measure the displacement, velocity and other parameters of the surfac...

AI Technical Summary

Problems solved by technology

The use of eddy current or optical sensor is a non-contact measurement method, which can dynamically measure the displacement, velocity and other parameters of the surface of the vibrating object, with high accuracy, but it also cannot measure the vibration displacement and velocity of each part of the entire solid boundary at one time. Measurement efficiency is not high

There is no method in the prior art that can simultaneously measure the vibration velocity of each local surface of the entire solid boundary in a non-contact manner

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