Phase calibration and correction method for mechanical impedance measurement

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.

Description

technical field [0001] The invention relates to the field of mechanical impedance testing of elastic elements, in particular to a phase calibration and correction method for mechanical impedance measurement. Background technique [0002] Mechanical impedance refers to the frequency domain dynamic characteristic parameter of the linear steady system in the vibration theory. Since the mechanical impedance is the complex ratio between the force and the acceleration, in the mechanical impedance measurement, the transmission relationship between the force and the acceleration measurement channel is Phase consistency is critical. 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 under test, which will affect the ...

AI 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 under test, which will affect the calculation of the loss factor. , which restricts the role of mechanical impedance parameters in the quantitative acoustic design of ship mechanical systems, and also restricts the application of elastic elements in other engineering fields and the improvement of elastic element design technology

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