A phase calibration and correction method for mechanical impedance measurement
A technology of mechanical impedance and phase calibration, applied in measuring devices, measuring mechanical impedance, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of mechanical impedance characteristic deviation, affecting loss factor, and restricting the improvement of elastic element design technology for elastic elements. , to achieve the effect of reducing error and phase deviation
Inactive Publication Date: 2015-09-30
中国船舶重工集团公司第七〇二研究所
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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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[0039] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.
[0040] The inventive method comprises the following steps:
[0041] The first step: use the mass loading method to obtain the force and acceleration signals measured when the force and acceleration measurement system is calibrated, such as figure 1 As shown, the scope of the mass loading method is applicable when the calibration frequency is lower than one-fifth of the system resonance frequency, and the specific steps of the mass loading method are as follows:
[0042] At first force sensor 3 is installed on the top of calibration vibration table 4, mass block 2 of known mass is installed in force sensor 3, acceleration sensor 1 is installed on mass block 2 simultaneously, force sensor 3 and acceleration sensor 1 are connected with external instrument, Start the calibration vibration table 4, use broadband random signals to input to the ...
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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 ...
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IPC IPC(8): G01H15/00
Inventor 周庆云王锁泉邱立凡蓝恭华
Owner 中国船舶重工集团公司第七〇二研究所