Automotive wheel center actual driving displacement measuring and extracting method

A technology of displacement measurement and extraction method, applied in wheel testing, measuring devices, instruments, etc., can solve the problems of installation difficulty, error, low frequency response of pull-wire displacement sensors, etc., and achieves improved accuracy, wide sampling frequency range, and sensitivity. high effect

Active Publication Date: 2017-03-22
重庆理工大科技发展有限责任公司 +1
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  • Application Information

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Problems solved by technology

The frequency response of the pull wire displacement sensor is too low, and there are more errors at high frequencies; the potentiometer sensor has high precision, but it is difficult to install; the laser sensor needs a reflective surface, and is easily affected by environmental factors such as dust and light brightness

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  • Automotive wheel center actual driving displacement measuring and extracting method
  • Automotive wheel center actual driving displacement measuring and extracting method
  • Automotive wheel center actual driving displacement measuring and extracting method

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the drawings.

[0034] A method for measuring and extracting actual driving displacement of an automobile wheel center, which is characterized in that it comprises the following steps:

[0035] a. Install the acceleration sensor on the wheel center position of the automobile wheel to be measured, and sample the acceleration data of the wheel center;

[0036] b. Smoothing the sampled acceleration data is specifically based on the principle of least squares using the following formula:

[0037]

[0038] Carry out the linear moving average of discrete data on the acceleration data of the wheel center;

[0039] In the formula, y is the result of smoothing the wheel center acceleration data; x is the wheel center acceleration sampling data; m is the number of data points; 2N+1 is the average number of points.

[0040] The Welch method (average periodogram method) is used to solve the self-power spectral...

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Abstract

The invention discloses an automotive wheel center actual driving displacement measuring and extracting method which comprises the following steps of a, mounting an acceleration sensor on a wheel center position of a to-be-tested automotive wheel and sampling acceleration data of the wheel center; b, performing smoothing processing on sampled acceleration data, and eliminating high-frequency noise; c, performing Fourier transform on a time domain signal of the acceleration data after smoothing processing in the step b for obtaining a frequency domain signal; d, performing two times of integration on the frequency domain signal for obtaining a wheel center displacement component; and e, performing inverse Fourier transform on the wheel center displacement component for obtaining a wheel center actual driving displacement signal. The automotive wheel center actual driving displacement measuring and extracting method has advantages of high convenience in mounting the sensor, relatively high detection sensitivity, relatively wide sampling frequency range and relatively low influence by environment factors. Furthermore, a Welch method is utilized for accurately determining a passband frequency range in integral transformation, eliminating high-frequency noise, improving integral transformation accuracy and improving measurement accuracy.

Description

Technical field [0001] The invention relates to the field of automobile detection, in particular to a method for measuring and extracting the actual driving displacement of the wheel center of an automobile. Background technique [0002] In the work of dynamic stress calculation, fatigue simulation analysis and vibration analysis of the body and frame, it is necessary to provide vibration displacement data. In actual vehicle testing, due to the limitations of equipment and environment, it is more difficult to measure the vibration displacement response curve of the test vehicle measuring point, and sometimes it is even impossible to directly measure it. [0003] At present, in the road test of the whole vehicle, the measurement of the wheel center displacement is mainly carried out by pulling wire, potentiometer or laser displacement sensors, but these three kinds of displacement sensors have limitations in the road test. The frequency response of the pull-wire displacement sensor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/02G01M17/013
CPCG01B21/02G01M17/013
Inventor 邹喜红王耀伟彭吉刚袁冬梅程凯华王瑞东田横
Owner 重庆理工大科技发展有限责任公司
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