噪声与振动控制2017，Vol.37Issue(5)：160-165,6.DOI:10.3969/j.issn.1006-1355.2017.05.033
行波管中高温平板结构动力学响应预报
Thermal-acoustic Response Prediction of High-temperature Flat Plates in Traveling-wave Tubes
摘要
Abstract
Research on the dynamic and acoustic responses of flat plates in thermal environments is significant to the optimal design of hypersonic aircrafts. For laboratory tests, the high-temperature traveling-wave tube is usually employed to simulate the thermal and acoustic environment to investigate the thermal-acoustic responses of high-temperature structures. In this paper, the thermal-acoustic responses of high-temperature plates in traveling-wave tubes are studied. Based on thin-plate theory and finite element method, the influences of high temperature on the inherent characteristics of flat plates are investigated. The dynamic responses of a simply supported heated C/SiC plates under random acoustic excitation are calculated and analyzed. First of all, the influence of thermal effect on the intrinsic modal characteristics of the flat plate is analyzed. Then, the acoustic load of a one-dimensional traveling wave is added on the surface of the plate. Finally, the analytical method is used to solve dynamic response of the plate under the thermal-acoustic combined loading. The results show that in the heating process, the intrinsic frequency of the plate decreases initially to a minimum value and then increases gradually. In the stage of intrinsic frequency decreasing, the softening effect due to elastic modulus reduction and thermal stresses is stronger than the hardening effect due to the thermal deformation. While in the stage of the intrinsic frequency re-increasing, the hardening effect due to the thermal deformation is dominant. In the range of linear response, the acceleration response of the plate to the thermal-acoustic combined loading depends on its thermal modes.关键词
振动与波/行波管/热模态/热屈曲/热噪声复合载荷Key words
vibration and wave/traveling-wave tube/thermal mode/thermal buckling/a combination of thermal and acoustic environments分类
航空航天引用本文复制引用
田艳妮,王建民,秦朝红,程昊,华宏星..行波管中高温平板结构动力学响应预报[J].噪声与振动控制,2017,37(5):160-165,6.基金项目
973资助项目(111402028) （111402028）
