摘要
以CORTEX-M3作为主控芯片,设计了一种全数字式机械传动效率实验台。针对NJ型转速转矩传感器输出的同频正弦信号,设计了射极跟随器、二阶巴特沃斯低通滤波器、放大偏置模块等外围电路,使其满足A/D转换器输入电压要求。采用离散傅里叶变换(DFT)算法,确定同频信号频率以及相位差,并对影响频率、相位差测量精度的因素进行了分析,为提高系统精度提供理论依据。上位机采用VB编程,串口通信获取实时数据。实验结果验证了设计的可行性及鲁棒性。
An experimental bed with full digital mechanical drive efficiency is presented,using the CORTEX-M3 single chip as the main control chip.The emitter follower,second-order Butterworth low-pass filter and the amplification bias circuit are designed for the sine signal generated by NJ speed-torque sensor with the same frequency to satisfy the voltage requirement.The discrete Fourier transform (DFT)algorithm is adopted to determine the frequency and phase difference of sine signal and the factors affecting measurement accuracy are analyzed to provide a theoretical basis for improving the accuracy of mechanical efficiency.This system takes the advantage of the VB language programming to realize the real time display of mechanical efficiency by serial communication.Experimental results demonstrate the feasibility and robustness of this design.
出处
《实验技术与管理》
CAS
北大核心
2016年第2期81-86,共6页
Experimental Technology and Management
基金
国家自然科学基金项目(51405239)
江苏省科技支撑计划项目(BE2014134)
南京农业大学青年科技创新基金项目(KJ2013042)
南京农业大学人才启动基金项目(Rcqd13-08)资助
南京农业大学工学院实验教改项目(2GG-051010)
关键词
实验设备
机械传动
相位差
DFT
测量精度
experimental equipment
mechanical drive
phase difference
DFT(discrete fourier transform)
measurement accuracy
