超低频振动校准自动控制系统的研究

摘要

针对超低频振动校准过程中测试时间长且效率较低的问题,设计了一种基于个人计算机及虚拟仪器技术开发的超低频振动校准自动控制系统.该系统由超低频标准振动台、功率放大器、激光测振仪、位移传感器、信号发生器、频比计数器、数据采集卡、计算机与测控软件等组成.通过线性逼近与逐步移频相结合的算法,精确控制振动台在超低频时迅速到达设定振级.试验结果证明该系统满足超低频振动校准要求,提高了超低频振动传感器的测试精度和自动化程度.%Aiming at the demerits of time-consuming and low efficiency during the process of ultralow frequency vibration calibration, an automatic ultralow frequency vibration calibration system based on personal computer and virtual instrument was presented.The system was consisted of ultralow frequency standard vibrator, power amplifier, laser vibrometer, displacement transducer, signal generator, universal counter, data acquisition card, computer, control software, etc..The strategy which via combining the method of linear approximation and stepby-step frequency shift could make the vibrator reach the pre-set vibration level quickly and precisely.The experiment results show that the system is suitable for the calibrating ultralow frequency vibration transducers very well and improves the automation of ultralow frequency calibrating vibration.