Development of Data Acquisition System for Micro-accelerometers’ Dynamic Centrifuge Test

摘要

In order to achieve the dynamic flight environment simulation assessment for the micro-accelerometer used in the inertial navigation or guidance systems,it is necessary to reform the precision static centrifuge’s mechanical and electronic architecture,accompanied with the development of the novel data acquisition system.System design,hardware and software implementation of the DAQ system for the micro-accelerometer’s dynamic centrifuge test is reported,which is a subsystem of the dynamic precision centrifuge,Involving its system architecture,hardware and software implementation.The DAQ system is developed based on the virtual instrument architecture,which has the ability to handle 4 analog or digital output micro-accelerometers simultaneously.Error analysis shows that when the micro-accelerometer’s output voltage signal range is +2.5 V ～-2.5V,the comprehensive measurement accuracy is less than 2.5mV; when the output voltage signal range is +12.5 V ～-12.5V,the comprehensive measurement accuracy is less than 12.5mV.When the sampling time interval is 20ms,synchronization error between each sampling point and the centrifuge controller is less than 0.1ms.