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Strain type torquer bandwidth expansion method based on least square complex exponential method

A technology of least squares and bandwidth expansion, which is applied in the direction of force/torque/power measuring instrument calibration/testing, instruments, and measuring devices, and can solve problems such as small cut-off frequency, reduced torque meter measurement performance, and reduced bandwidth

Active Publication Date: 2020-08-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cut-off frequency selected by this empirical estimation method is small, although the oscillation signal is filtered out to make the passband flat, but it also greatly reduces the bandwidth and reduces the measurement performance of the torque meter

Method used

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  • Strain type torquer bandwidth expansion method based on least square complex exponential method
  • Strain type torquer bandwidth expansion method based on least square complex exponential method
  • Strain type torquer bandwidth expansion method based on least square complex exponential method

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Embodiment Construction

[0083] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0084] The strain gauge torque meter bandwidth expansion method based on the least squares complex exponential method provided by the present invention is composed of the following parts:

[0085] In the first part, the modal parameter identification is carried out using the least squares complex exponential method;

[0086] Step 101: Load the measurement system, use an impact hammer to apply impact torque to the torque meter before the system performs measurement, and collect the torque signal output by the torque meter;

[0087] Step 102: Select the data segment h representing the free response of the torque meter in the collected signal n (n=0,1,2...);

[0088] Step 103: Put h ...

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Abstract

The invention discloses a strain type torquer bandwidth expansion method based on a least square complex exponential method. The method comprises the following steps of 1, carrying out modal parameteridentification by using the least square complex exponential method, and 2, designing a digital correction unit including a comb filter and a low-pass filter according to the identified modal parameters, and correcting the torquer according to the digital correction unit. According to the method, modal parameter identification can be carried out on the torquer according to a least square complexexponential method, then the digital correction unit is designed according to modal parameters such as damping inherent frequency and damping ratio, frequency bands near inherent frequency points areaccurately corrected, amplitude-frequency response in a passband is ensured to tend to be constant, and therefore the frequency bands are expanded.

Description

technical field [0001] The invention belongs to the technical field of instruments and meters, in particular to a method for expanding the bandwidth of a strain gauge torque meter based on the least squares complex exponential method. Background technique [0002] The measuring principle of the strain gauge torque meter is the strain effect. When the torque is applied, the strain gauge is torsionally deformed along with the measuring shaft, and its resistance value changes accordingly; the torsion angle of the measuring shaft can be obtained by measuring the resistance value of the strain gauge; according to the torsion angle and the torsional elastic modulus of the measuring shaft, it can be Calculate the measured torque. When the measuring shaft and strain gauge with small torsional elastic modulus are selected, the torque meter has high sensitivity and can be used for small moment measurement. [0003] An important part of motor performance testing is to measure the mag...

Claims

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Application Information

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IPC IPC(8): G01L25/00
CPCG01L25/003
Inventor 段发阶刘昌文傅骁谢琛
Owner TIANJIN UNIV