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Structural parameter identification method for dynamic model of accelerometer based on refined spectrum analysis

An accelerometer and structural parameter technology, applied in the testing/calibration of velocity/acceleration/shock measurement equipment, velocity/acceleration/shock measurement, acceleration measurement using inertial force, etc. Frequency resolution reduces resonant frequency and resonant amplitude error and other issues

Active Publication Date: 2016-09-07
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0004] The accelerometer frequency response non-parametric model obtained by using the input and output signals of the accelerometer and the discrete Fourier transform (DFT) method has a certain accuracy, but the resonant frequency and the corresponding resonant amplitude are limited by the frequency resolution, and the error is large
When the sampling frequency and sampling data length are fixed, the above method cannot reduce the error of resonance frequency and resonance amplitude by improving the frequency resolution

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  • Structural parameter identification method for dynamic model of accelerometer based on refined spectrum analysis
  • Structural parameter identification method for dynamic model of accelerometer based on refined spectrum analysis
  • Structural parameter identification method for dynamic model of accelerometer based on refined spectrum analysis

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specific Embodiment approach

[0045] Specific implementation method: using the shock excitation device established according to the ISO 16063-13 absolute method shock calibration standard, the typical input acceleration signal waveform of the device is as follows figure 2 shown. In this embodiment, the shock excitation acceleration signal and the accelerometer response signal are collected synchronously at a sampling frequency of 10MHz, and a total of 1.2×10 data samples are collected for each channel. 5 indivual. The peak acceleration of impact excitation is about 3.83×10 2 g, where g=9.81m / s 2 . In order to improve the signal-to-noise ratio, the part before the excitation and the part after the end of the response in the data were removed, and the data with the effective effect of the shock excitation totaled 51,000 points.

[0046] Perform fast Fourier transform of 51,000 points on the shock excitation acceleration time series and the accelerometer response time series according to the formula (1-1...

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Abstract

The invention discloses a structural parameter identification method for a dynamic model of an accelerometer based on refined spectrum analysis, and belongs to the fields of information technology processing, measurement and control. Input and output data of the accelerometer is obtained and captured via an impact calibration experiment in an accelerometer absolute method; discrete Fourier transform is carried out on the obtained input and output data to determine estimation of frequency response of the accelerometer; the estimation of frequency response is analyzed to obtain a primary estimated value of the resonant frequency; a spectrum refining method is used to refine zones near the resonant frequency and the zero frequency, and the resonant frequency of the resonant amplitude and a secondary estimated value of the zero-frequency amplitude are obtained; and the relation between the model parameter and a secondary estimated value of the coordinate of a feature point is utilized to determine estimation of the structural parameter of the dynamic model of the accelerometer, and the structural parameter of the dynamic model of the accelerometer is identified based on refined spectrum analysis. According to the method, the process of parameter identification of the two-order dynamic order of the accelerometer is simplified, and the modeling and identification precision and calculation efficiency of the accelerometer in the frequency domain are improved.

Description

technical field [0001] The invention relates to a sensor dynamic model parameter identification method, which belongs to the field of information technology signal processing and measurement and control, and in particular to a method for identification of accelerometer dynamic model structural parameters based on refined spectrum analysis. Background technique [0002] The accelerometer is a sensor widely used to measure the impact or vibration of the carrier (such as mechanical equipment or building structure, etc.), and it is a data source for vibration analysis and fault detection. [0003] In the linear dynamic range, the accelerometer is usually equivalent to a single-degree-of-freedom mass-spring-damper system, and the mass block is built into the accelerometer housing and supported by the spring and the damper. The mass acts on the piezoelectric element of the accelerometer, and the piezoelectric element produces a charge output proportional to the displacement of the...

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Application Information

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IPC IPC(8): G01P21/00G01P15/09
CPCG01P15/09G01P21/00
Inventor 王建林魏青轩赵利强于涛王颖
Owner BEIJING UNIV OF CHEM TECH
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