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Engineering nonlinear vibration detecting method

A technology of nonlinear vibration and detection method, which is applied in vibration measurement in solids, measurement of vibration, acceleration measurement using inertial force, etc. It can solve the problems that the embedded dimension and delay time cannot be verified, and the reliability of the phase space is not high. , to achieve the effect of being easy to promote and use, and strong operability

Active Publication Date: 2008-07-16
TAIYUAN UNIV OF TECH
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Problems solved by technology

One of the acceleration, velocity and displacement signals can be used for phase space analysis through phase space reconstruction, but the embedding dimension and delay time of the reconstructed phase space cannot be verified after calculation, so the reliability of the reconstructed phase space degree is not high

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Embodiment Construction

[0019] The engineering non-linear vibration detection method of the present invention, according to the technical scheme implemented by it, further describe its method steps in detail below through the embodiment:

[0020] (1) The three-axis low-impedance piezoelectric accelerometer is attracted to the measured structure with a magnetic base, the accelerometer is connected to the signal processor through the coupler or connected to the A / D conversion board through the coupler, and then the signal is sent to the computer . Three-way (X, Y, Z) acceleration signals are collected (X, Y, and Z three-way signals are x(n), y(n), z(n) respectively).

[0021] (2) Use wavelet nonlinear threshold filtering to filter out the broadband background noise of the acceleration signal collected (x(n), y(n), z(n) after filtering are respectively The following takes the signal in the X direction as an example to illustrate the processing process:

[0022] (a) Select the appropriate wavelet ...

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Abstract

The invention provides an engineering nonlinear vibration inspection method. The method adopts a wavelet nonlinear threshold value filtering wave to filter wide-frequency background noise of a three-direction acceleration signal and to remove DC bias so as to get the treated acceleration signals after frequency domain filtering and removal of trend term. Then speed signals and displacement signals are obtained after the acceleration signals is subject to a first time and second time integrals and removal of trend term. The characteristics and types of the nonlinear vibration are determined through a three-dimensional phase space diagram and other calculations of a reconstructed phase space tested by the three-dimensional phase space diagram. The invention adopts three-direction low resistance piezoelectricity acceleration meter to measure the vibration accelerations of three orthogonal directions. The invention has convenient installation, easy usage and reliable analysis, overcomes the problems of drifting, delay and aberration of the actual acceleration signals after passing through analog integration or digital integration. The invention plays an important role in the engineering nonlinear vibration inspection for mechanical mechanisms, bridges, dams and buildings, etc.

Description

technical field [0001] The invention belongs to the field of engineering vibration detection, and specifically relates to an integration method of engineering measured vibration acceleration signals and an engineering nonlinear vibration detection method based on the method. technical background [0002] Three-way low-impedance piezoelectric accelerometer can measure vibration acceleration in three orthogonal directions (X, Y, Z) at the same time. It is easy to install and use. It is used in the vibration acceleration measurement of mechanical structures, bridges, dams and buildings, etc. play a large role in. In many cases, the vibration velocity and displacement are also two important physical quantities, but the measurement of these two physical quantities is not very convenient, especially for large structures. Theoretically, the velocity and displacement signals can be obtained after the acceleration signal is integrated once and twice, but in practice, the acceleratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H1/00G01P7/00G01P15/09
Inventor 熊晓燕熊小晋武兵张宏李东文
Owner TAIYUAN UNIV OF TECH
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