高温真空阻尼测试系统的设计与性能测试

为研究高温真空下材料阻尼的变化规律,根据共振驻留法进行阻尼识别的方法,研制了一套高温真空环境下的阻尼测试系统,解决了高温真空环境下施加激励和测量试件振动信号的难题.高温真空阻尼测试系统主要包括电炉加热控制子系统、真空控制子系统、温度监视子系统、水冷子系统和阻尼测试子系统.性能测试实验表明,该系统的温度可自动控制,可控范围为室温～1100℃,最高真空度可以达到0.1Pa.具有温度和真空度稳定,操作灵活简便,读数直观清晰等特点.

Design,Construction and Operation of Material Damping Measuring System for Use in High-Temperature and Vacuum Environment

Aim.To our knowledge,there is no paper in the open literature dealing with the topic of the above title.In Ref.3,we discussed the methods of measuring material damping.Starting from Ref.3,we now design,build and operate a material damping measuring system for use in high-temperature and vacuum environment.Section 1 of the full paper deals with designing and building a setup for implementing high-temperature and vacuum environment; Fig.2 gives the schematic of the setup' s construction.Section 2 deals with designing the material damping measuring system for use in high-temperature and vacuum environment.The measuring system consists of five subsystems: hearing oven and heating control,vacuum control,temperature monitoring,water cooling,and damping measuring.Section 3 presents the operation results in Figs.6 through 8; their analysis shows preliminarily that:( 1 ) the temperature of the measuring system can be automatically controlled in the range of room temperature to 1 100℃ ; (2) the pressure of rarefied air can be reduced to as low as 0.1 Pa; (3) its temperature and vacuum can be kept stable.Its operation is easy and simple.