板状结构可变边界热振耦合试验系统研制

Development of Coupled Thermo-Vibration Test System for Plate Structure with Variable Boundary

摘要:

针对板状结构存在不同边界约束以及恶劣高温环境,研制了变边界高温试验模态系统,为板状结构在高温振动耦合环境下的测量提供一套低成本、可变边界试验系统。该试验系统采用虚拟仪器LabVIEW对石英灯阵进行温度控制,自行研制耐高温陶瓷导杆引伸装置将板状结构上的振动信号传递至非高温区域,使用激振器对板状结构进行激励,通过常温加速度传感器测量其响应信号,使用时-频联合技术对测量的模态数据进行参数识别获得板状结构的模态参数。以45号钢板为测试样件,得到其在室温下不同边界的模态参数；并在单边约束下对45号钢板进行500℃高温振动耦合实验,得出其模态参数。该试验系统可为板状结构在变边界高温振动耦合环境下的安全设计提供可靠依据。

Abstract:

Aiming at the different boundary constraints and harsh high temperature environment of plate structure, a variable boundary high temperature test modal system is developed, which provides a low cost and variable boundary test system for the measurement of plate structure under high temperature vibration coupling environment. The test system uses virtual instrument LabVIEW to control the temperature of quartz lamp array. A high temperature resistant ceramic guide rod extension device is developed to transmit the vibration signal from the plate structure to the non-high temperature area. The plate structure is stimulated by a vibrator. The response signal is measured by an acceleration sensor at room temperature. The system uses frequency-frequency combination. The technique identifies the measured modal data and obtains the modal parameters of the plate structure. Taking No. 45 steel plate as test sample, the modal parameters of different boundaries at room temperature were obtained, and the modal parameters of No. 45 steel plate were obtained by high temperature vibration coupling experiment under unilateral constraints. The test system can provide a reliable basis for the safety design of plate structures under the coupled environment of variable boundary and high temperature vibration.