中文摘要：

新型变频振动精密下料方法利用变频振动实现低应力下料,关键是建立有效的振动测控系统。在分析了下料系统原理的基础上,构建了振动测控系统的硬件结构。采用压电加速度传感器配合电荷放大器,通过数据采集卡对精密下料系统的振动进行采样,基于虚拟仪器的振动测控系统实现对下料机的各种测控,界面友好,实用性强。通过对精密下料机振动的成功测控,实现了对硬铝棒料的精密下料。实验结果表明：应用振动测控系统时的下料效果非常理想,可以投入使用。

英文摘要：

A new type of cropping machine utilizes the variable-frequency to shear bar with low stress, an effective measure and control system is necessary. Based on the analysis of the principle of the cropping machine, the hardware of the measure and control system was built up. A piezoelectric sensor and charge amplifier were employed to collect the vibration characteristic of the precision cropping machine through a PCL 818L data card. The software of measure and control for vibration was programmed based on the LabVIEW, the main panel is friendly and practical. According to the results of the bar cropping experiments, the measurement and control of the cropping machine are successful.