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Structural damping ratio identification method based on free vibration

A technology for structural damping and identification methods, which is applied in complex mathematical operations, measuring devices, instruments, etc., and can solve the problems of free vibration easily affected by noise and difficulty in displacement measurement.

Active Publication Date: 2021-09-10
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Botelho E C, Campos A N, Barros D E. Damping behavior of continuous fiber / metal composite materials by the free vibration method. Composites Part B: Engineering, 2005, 37(2-3): 255-263. Disclosed based on displacement of free vibration pairs The physical meaning of the digital attenuation method is clear, but free vibration is easily affected by noise, and the measurement results need to be baseline corrected
Simultaneous experiment, displacement measurement is more difficult

Method used

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  • Structural damping ratio identification method based on free vibration
  • Structural damping ratio identification method based on free vibration
  • Structural damping ratio identification method based on free vibration

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Embodiment Construction

[0024] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0025] The invention provides a structural damping ratio identification method based on free vibration.

[0026] like figure 1 As shown, the method includes the following steps:

[0027] S1: Install a speed sensor 2 on the structural top plate 5 of the frame structure 1, the speed sensor 2 is installed in the middle of the structural top plate 5 of the frame structure 1, and the speed sensor 2 is connected to the computer 4 through the digital signal acquisition instrument 3;

[0028] S2: Apply the initial displacement on the roof of the structure, and measure the velocity time history curve of the free vibration of the roof of the structure;

[0029] S3: Perform Fourier transform on the speed time history curve to obtain the speed response spectrum cu...

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Abstract

The invention provides a structural damping ratio identification method based on free vibration, and belongs to the technical field of vibration signal processing. The method comprises the following steps: applying initial displacement to a structure to enable the structure to freely vibrate, measuring the speed response of the structure top plate through a speed sensor mounted on the structure top plate to obtain a speed time-history curve, performing Fourier transform on the speed time-history curve, and identifying the structure damping ratio according to a frequency spectrum curve of the speed response. Under the condition of free vibration, baseline processing does not need to be carried out on the speed time history, calculation is simple and convenient, and the method has the advantages of being simple in experimental installation, easy to operate and the like.

Description

technical field [0001] The invention relates to the technical field of vibration signal processing, in particular to a structural damping ratio identification method based on free vibration. Background technique [0002] Damping is a parameter that characterizes vibration attenuation and energy dissipation in a vibration system, and is an objective existence of a vibration system. The magnitude of damping and the vibration intensity of the system are interrelated, making damping an important application in vibration reduction and noise reduction. Proposing an efficient and convenient damping identification method is self-evident. [0003] At present, the identification methods of damping mainly include the logarithmic decay rate method of free vibration, the half power bandwidth method of forced vibration of simple harmonic load, and the experimental modal analysis method under pulse load or ground pulsation. Morse, Ingert. Theoretical Acoustics. Beijing: Science Press, 19...

Claims

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Application Information

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IPC IPC(8): G01H17/00G06F17/14
CPCG01H17/00G06F17/14
Inventor 潘旦光刘钰程业付相球
Owner UNIV OF SCI & TECH BEIJING
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