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This paper applies the constant vibration stress accelerated degradation tests to study the effects of random vibration on the parameters stability of quartz flexible accelerometer. Two stress levels of the accelerated degradation test (ADT) are conducted where random vibration spectrum is experienced by accelerometers in the transportation. Then two-step analysis method based on the pseudo life is...
The degradation mechanisms and causes of performance parameters of quartz flexible accelerometer were analyzed in this paper, and the table of accelerometers' parametric degradation mechanisms and reason analysis (PDMRA) was made. On the basis of PDMRA, the weak links of accelerometers were analyzed, and the influence of varying external environment stress with time on accelerometers was studied,...
Accelerometer is a sensor which converts acceleration that acts on the transport input shaft to an electrical signal by a variety of means of measurements. Acceleration will change into velocity by integration, while acquire the position information by the second integration. Through measuring linear acceleration of vehicle along the certain direction by accelerometer, inertial navigation system can...
The manufactured quartz flexible accelerometer has the serious problem of bad parametric repeatability. To solve this issue, this paper does systematic research about the accelerated stability test method to improve the long-term repeatability of the accelerometer from the product hierarchy. Proceeding from the analysis of the accelerometer's internal stress mechanism, it makes a positioning analysis...
This paper presents a optimal design approach of step stress accelerated degradation test (SSADT) for quartz flexible accelerometers under the assumption that the degradation of each accelerometer follows a Wiener process and the degradation rate at different stress levels satisfies an Arrhenius function. The asymptotic variance of the pth percentile of lifetime is adopted as optimization objective...
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