Abstract
In order to meet the needs for aircraft vibration transducer and measurement equipment to be calibrated at the job site, it is necessary to design a compact, dynamic and functional vibration standard device. This paper introduces a vibration standard device based on random comparison method. The structure and working principle of software and hardware are described in detail. Unlike the calibration requirements under laboratory conditions, on-site calibration requires that the calibration process be more consistent with the actual operating conditions. A random vibration comparison calibration method using random signals as excitation sources is designed. The vibration standard device can be maneuvered from the laboratory environment to the aircraft maintenance site. It has been proved measurement uncertainty of the system is 1.0 % (k= 2) by the method of control accuracy.
Highlights
In recent years, the research on vibration calibration in various countries mainly focuses on how to realize ISO16063-11 “one-time calibration of laser interference method” and ISO16063-13 “one-shot calibration of laser interference method”.The lower limit of the frequency of the low frequency acceleration standard of Physikalisch-Technische Bundesanstalt (PTB) is 0.1 Hz, the maximum acceleration is 2 m/s2, and the maximum amplitude is 1 m [1].The high-frequency vibration standard established by the National Institute of Standards and Technology (NIST) in 1969 has reached an accuracy of 1 % in the frequency range of (10-500) Hz [2].The accelerometer calibration system frequency of the National Metrology Institute of Japan (NMIJ) was extended to 0.1 Hz [3]
This standard equipment is based on absolute methods and can only be used in the laboratory
Some vibration equipment in engineering, especially in the aerospace sector, needs to be calibrated in the field, in which case standard equipment based on absolute methods cannot be used
Summary
The research on vibration calibration in various countries mainly focuses on how to realize ISO16063-11 “one-time calibration of laser interference method” and ISO16063-13 “one-shot calibration of laser interference method”. The lower limit of the frequency of the low frequency acceleration standard of Physikalisch-Technische Bundesanstalt (PTB) is 0.1 Hz (shake table 0.01 Hz), the maximum acceleration is 2 m/s2, and the maximum amplitude is 1 m [1].The high-frequency vibration standard established by the National Institute of Standards and Technology (NIST) in 1969 has reached an accuracy of 1 % in the frequency range of (10-500) Hz [2].The accelerometer calibration system frequency of the National Metrology Institute of Japan (NMIJ) was extended to 0.1 Hz [3] This standard equipment is based on absolute methods and can only be used in the laboratory. In order to meet the needs of on-site calibration of vibration transducer and measuring equipment, the DH11 vibration standard device was designed and developed based on random comparison method
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