新型落锤冲击试验系统研制

针对现有落锤冲击试验系统无法低成本、高精度地获取冲击全过程中试样的力、位移等参数的技术难题，提出一种新型落锤冲击试验系统。该试验系统采用磁栅尺和动态力传感器直接精确测量被测试件的力与位移数据，通过电磁铁与电动绞盘实现锤头的提升与释放，并利用虚拟仪器LabVIEW实现对冲击试验系统的数字化控制和数据采集分析功能。以304不锈钢圆管为测试样件，通过冲击试验与ABAQUS有限元冲击仿真试验进行对比，结果表明，冲击实测数据与仿真数据吻合较好，证实所设计冲击试验台具有较高的可靠性。

Development of a New Drop Hammer Test System

To obtain the force and displacement parameters of the specimen in the whole process of impact with low cost and high precision, a new drop hammer test system was developed. A magnetic sensor is used to measure the displacement of the hammer. A piezoelectric dynamic force sensor is used to measure the impact force. The hammer is lifted and released by an electromagnet and an electric winch. T he control, data acquisition and analysis of the impact test system are realized by NI LabVIEW. To validate the correctness of the new drop hammer test system, a comparison between drop test and simulation for a 304 stainless steel pipe was carried out. The comparison results show that the force-displacement curve drawn in accordance with the measured data matched well with that by simulation, indicating that the accuracy of the drop hammer test system was high.