Phase calibration and correction method for mechanical impedance measurement

A mechanical impedance and phase calibration technology, which is applied in the direction of measuring device, measuring mechanical impedance, measuring ultrasonic/sonic wave/infrasonic wave, etc., can solve the problems of mechanical impedance characteristic deviation, affecting loss factor, restricting the improvement of elastic element design technology, etc. , to achieve the effect of reducing the phase deviation and reducing the error

Inactive Publication Date: 2013-10-09
中国船舶重工集团公司第七〇二研究所
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AI-Extracted Technical Summary

Problems solved by technology

Due to the different measurement systems of the existing measurement methods, and only the amplitude is considered in the measurement process, and the phase is not studied in depth, the phase deviation of the test results will easily lead to the deviation of the mechanical impedance characteristics of the elastic element unde...
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Abstract

The invention relates to a phase calibration and correction method for mechanical impedance measurement. Signals of measured force and accelerated speed during calibration of a force and accelerated speed measurement system are obtained by means of the quality loading method, an amplitude and a phase between a force measuring channel and an accelerated speed measuring channel are corrected, deviations of the amplitude and the phase between the force channel measuring channel and the accelerated speed channel are obtained, and a correction factor is combined to correct mechanical impedance. According to the method, under the condition that only calibration of the amplitude of a sensor is considered, and the phase is not deeply researched in the past, calibration is conducted on frequency response of the amplitude and the phase of the whole measurement system, calibration results are used for mechanical impedance measurement and data processing, the deviations of the phase of the mechanical impedance are greatly reduced, and errors, caused by the measurement system, of measurement of the mechanical impedance can be effectively reduced.

Application Domain

Impedence

Technology Topic

PhysicsCalibration result +5

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  • Phase calibration and correction method for mechanical impedance measurement
  • Phase calibration and correction method for mechanical impedance measurement
  • Phase calibration and correction method for mechanical impedance measurement

Examples

  • Experimental program(1)

Example Embodiment

[0066] The specific embodiment of the method of the present invention is as follows:
[0067] Take the mechanical impedance test of the BM300 vibration isolator as an example, and use two sets of measurement systems for measurement. Such as image 3 As shown, the first mechanical impedance measurement system uses a 9341B force sensor, a 5015A charge amplifier, a 352C68 acceleration sensor, and a 2694 signal conditioning instrument and data acquisition instrument for measurement, such as Figure 4 As shown, the second mechanical impedance measurement system uses ICP type 288D01 impedance head and 2694 signal conditioning instrument, and 2694 type signal conditioning instrument and data acquisition instrument for measurement.
[0068] Such as Figure 5 to Figure 8 As shown, the test results of the axial input mechanical impedance of the vibration isolator under no-load measured by two different measurement systems, where Figure 8 There is a significant difference in the phase characteristics of the mechanical impedance of Figure 5 and Image 6 In, there are also differences in the real and imaginary parts reflecting the phase, such as Picture 9 As shown, the figure shows the amplitude-phase calibration result of the first mechanical impedance measurement system, Picture 9 9-1 represents the frequency-varying transfer function amplitude between the force sensor 3 and the acceleration sensor 1 test channel when the first mechanical impedance measurement system is used for calibration, and 9-2 represents the force vs. The amplitude deviation between accelerations, 9-3 represents the phase deviation between force and acceleration when the first mechanical impedance measurement system is used for calibration. Such as Picture 10 As shown, the figure shows the amplitude-phase calibration result of the second mechanical impedance measurement system, where Picture 10 10-1 represents the frequency-dependent transfer function amplitude between the force sensor 3 and the acceleration sensor 1 when calibrated by the second mechanical impedance measurement system, and 10-2 represents the force and The amplitude deviation between accelerations, 10-3 represents the phase deviation between force and acceleration when the second mechanical impedance measurement system is used for calibration. Combine the above Figure 5 to Figure 8 ,as well as Picture 9 , Picture 10 , It can be judged that there is an error between the mechanical impedance measured by the two measurement systems. The error is caused by the amplitude and phase deviation between the measurement channels, and the amplitude and phase need to be corrected.
[0069] use Picture 9 and Picture 10 Amplitude and phase calibration results, the mechanical impedance test results of the BM300 vibration isolator are corrected, using the method of the present invention, the corrected mechanical impedance characteristic results obtained by the first mechanical impedance measurement system and the second mechanical impedance measurement system are shown in Figure 11 to Figure 14 Through comparison, it can be seen that after the mechanical impedance tested by the method of the present invention is corrected, the mechanical impedance obtained by the first mechanical impedance measurement system and the second mechanical impedance measurement system are relatively close, and the amplitude, phase, real and imaginary impedance The parts tend to be consistent, and the impedance phase deviation is greatly reduced.

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