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Harmonic identification method of sinusoidal vibration test of electrohydraulic servo vibration table

A sinusoidal vibration, electro-hydraulic servo technology, applied in the field of harmonic identification, can solve problems such as the inability to directly obtain harmonic waveforms

Inactive Publication Date: 2013-07-31
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

"Self-Tuning of Kalman Filters for Harmonic Computation" (José A. Rosendo Macías, Senior Member, IEEE, and Antonio Gómez Expósito, Fellow, IEEE. Self-Tuning of Kalman Filters for Harmonic Computation. IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 21, NO.1, JANUARY2006.501-503.) The identification obtained is the amplitude and phase value of each harmonic, and the waveform of each harmonic cannot be obtained directly, which is quite different from this patent

Method used

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  • Harmonic identification method of sinusoidal vibration test of electrohydraulic servo vibration table
  • Harmonic identification method of sinusoidal vibration test of electrohydraulic servo vibration table
  • Harmonic identification method of sinusoidal vibration test of electrohydraulic servo vibration table

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Embodiment 1

[0081] When the sinusoidal input signal of the vibration table is 4sin(2π×5t)m / s 2 , the acceleration response signal has a very serious distortion phenomenon, the acceleration response signal is identified, and the following can be obtained figure 2 The identification results of each harmonic amplitude shown in image 3 The phase identification results of each harmonic are shown.

[0082] The amplitude identification result is basically stable within 0.8 seconds after the identification starts, and the fluctuation range after stabilization is very small. The identification result after stabilization shows that the amplitude of the fundamental frequency component is about 4m / s 2 , while other harmonic amplitudes are relatively small. The stabilization speed of the phase identification result is faster, and it stabilizes after 0.5 seconds after the identification starts.

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Abstract

The invention relates to a harmonic identification method, in particular to a harmonic identification method of a sinusoidal vibration test of an electrohydraulic servo vibration table. The method comprises the steps that (1), a state space model of a response signal is established; (2), a state vector estimated value at k time is subjected to recursive calculation; and (3), the state vector estimated value is decomposed, and a harmonic value at the k time is extracted. The harmonic identification method of the sinusoidal vibration test of the electrohydraulic servo vibration table can obtain more accurate information of a harmonic component of the response signal more quickly in real time, so that a data basis is provided for harmonic cancellation directly.

Description

technical field [0001] The invention relates to a harmonic identification method, in particular to a harmonic identification method for a sinusoidal vibration test of an electro-hydraulic servo vibration table. Background technique [0002] Sinusoidal vibration test is an experimental method often used in mechanical environment experiments. Sinusoidal vibration generally exists in the vibration generated by pulse and oscillation, and is the most basic form of vibration. Use sinusoidal signals as excitation to generate corresponding sinusoidal vibrations to simulate the vibration environment, which can be used to verify the structural design of the product, test the fatigue strength of the specimen, inspect the quality of processing and manufacturing, analyze the resonance frequency and resonance stagnation point, and study the frequency response characteristics of the structure . Moreover, the sinusoidal vibration test is simple, easy, economical and reliable, and is used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 姚建均狄多涛姜贵林高爽严寒肖蕊
Owner HARBIN ENG UNIV
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