Laser Doppler vibration measurement method impact acceleration measurement device and method

A Doppler vibration measurement method and acceleration measurement technology, which is applied in the direction of acceleration measurement using inertial force, and achieves the effect of simple method.

Active Publication Date: 2017-02-22
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing impact velocity waveform filtering and differentiation method, and propose a method of using the impact velocity waveform step rise time as a reference scale, filtering the average value in the local window and then differentially realizing the filter differentiation method Laser Doppler Vibrometer Shock Acceleration Measuring Device and Method for Obtaining Shock Acceleration Waveform

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  • Laser Doppler vibration measurement method impact acceleration measurement device and method
  • Laser Doppler vibration measurement method impact acceleration measurement device and method
  • Laser Doppler vibration measurement method impact acceleration measurement device and method

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0060] Such as figure 1 As shown, a laser Doppler vibrometer shock acceleration measurement device includes HOPKINSON impact machine, projectile body, cushion, HOPKINSON rod, anvil body, calibrated shock acceleration sensor, computer, digital oscilloscope, differential laser interferometer , signal conditioner and grating.

[0061] Its working process is: use the HOPKINSON impact machine to launch the projectile, hit the cushion and the HOPKINSON rod, make the HOPKINSON rod move, and then hit the anvil, so that the grating and the acceleration sensor to be calibrated will generate impact motion; the impact motion is passed through the grating. The differential laser interferometer converts it into an electrical signal, which is then collected and recorded by a digital oscilloscope to form waveform data; the shock acceleration waveform sequence is outpu...

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Abstract

The invention relates to a laser Doppler vibration measurement method impact acceleration measurement method, and belongs to the technical field of impact measurement test. The laser Doppler vibration measurement method impact acceleration measurement device comprises a HOPKINSON impact machine, an elastic body, a cushion layer, a HOPKINSON bar, an anvil body, a corrected impact acceleration sensor, a computer, a digital oscilloscope, a differential laser interferometer and a signal tuner. Impact acceleration waveforms are acquired by the mode of realizing filtering differential through average filtering in a local window and then differential so that the problem of wrong direction of an ISO standard recommendation method can be avoided. Besides, the average value of the absolute values of the deviation of a local end base straight line and each measurement value point to act as an error scale identification function of average filtering in the range of the average filtering window, and the relation curve of the identification function value and rising time and the local average window width ratio acts as the criterion of searching the optimal average window so as to solve the problem of optimal filtering.

Description

technical field [0001] The invention relates to a shock acceleration measurement device and method based on optimal filtering and differential laser Doppler vibrometer method, in particular to a precise shock acceleration measurement method of homodyne and heterodyne laser interference, and belongs to the technical field of shock measurement and testing. Background technique [0002] Since it belongs to the non-contact measurement method, there is no mechanical contact and external influence on the moving measured object. The laser interferometry using the laser Doppler effect is by far the best way to measure high-level shock and vibration. It can obtain far Measurement accuracy and resolution that exceed other methods. Therefore, the highest measurement standard devices in the world use this method. [0003] Since the basic principle of the laser Doppler effect is that the Doppler frequency shift generated by relative motion is linearly related to the relative motion spee...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/03
Inventor 梁志国朱振宇
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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