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设计了一种基于现场可编程门阵列(FPGA)脉冲计数原理的瞬时角加速度测量系统。该系统可以跟踪测量转轴的瞬时角加速度,且能够补偿因编码器原理、工艺和安装偏差产生的周期性非线性系统误差,从而显著提高测量精度。该系统利用FPGA高速并行的特点,采用乒乓流水线采集机制,对磁旋转编码器的输出脉冲进行精确实时测量,在校正过程中通过计算测量波形相对于理论波形的偏差特征值来拟合出补偿系数,实现在测量过程中对瞬时角加速度测量误差的补偿。实验表明:该系统具有高精度和高分辨率,可以有效补偿由旋转编码器波形偏差而导致的瞬时测量误差,提高测试精度。
An instantaneous angular acceleration measurement system based on the pulse counting principle of field programmable gate array (FPGA) is designed. The system tracks the instantaneous angular acceleration of the shaft and compensates for periodic non-linear system errors due to encoder principle, process, and installation deviations to significantly improve measurement accuracy. The system uses the characteristics of high-speed FPGA parallel, using ping-pong pipeline acquisition mechanism, the magnetic rotary encoder output pulse accurate real-time measurement during calibration by calculating the measured waveform relative to the theoretical waveform deviation characteristic value to fit the compensation coefficient , To achieve the measurement of instantaneous angular acceleration measurement error compensation. Experiments show that the system has high precision and high resolution, which can effectively compensate for the instantaneous measurement error caused by the deviation of the rotary encoder waveform and improve the test accuracy.