高温环境下结构模态试验技术

由于高超声速飞行器长时间在大气层内工作会面临恶劣的气动热环境,飞行器结构地面模态试验必须考虑高温影响,但高温环境下结构模态试验远比常规试验复杂,目前仍存在很多技术难点亟待解决.本文首先对高温环境下的结构模态试验技术国内外发展现状进行了综述,详细分析了现有的高温环境下结构模态试验中的激励力与振动响应测量技术的特点及适用性,最后展望了高温环境下结构热模态试验技术的发展方向和研究重点.

ADVANCE OF EXPERIMENTAL TECHNOLOGIES FOR STRUCTURAL MODAL TEST IN HIGH TEMPERATURE ENVIRONMENTS

Since the hypersonic vehicle is acted by a serious aerodynamic thermal load caused by the flight through the atmosphere, it is necessary to consider the effect of the high temperature in the ground test of the vehicle structures. But the structural modal experiment in a high temperature environment is far more complex than the normal modal experiment with many technical difficulties to be solved. In this paper, the advance of the thermal modal test technology is reviewed. The characteristics and the applicability of the excitation and measurement techniques to be used in the high temperature environment are discussed in detail. The development direction and the research focus of the structural modal test technology in the high temperature environment are suggested.