【作者】 赵锐； 于开平； 崔乃刚； 白云鹤； 周昊天； 李向阳；

【Author】 Rui Zhao;Kaiping Yu;Naigang Cui;Yunhe Bai;Haotian Zhou;Xiangyang Li;Department of Astronautic Science and Mechanics,Harbin Institute of Technology;Department of Astronautic Engineering,Harbin Institute of Technology;

【机构】 哈尔滨工业大学航天科学与力学系； 哈尔滨工业大学航天工程系；

【摘要】 复合材料结构已经在航空航天工程领域得到了广泛应用。当飞行器在大气中高速飞行时,气动热载荷会改变复合材料结构的动力学特性和动力学响应。目前,学者对恒定热环境下复合材料结构动力学响应的数值仿真进行了较多研究,而对于时变温度环境下的数值仿真还尚未开展研究。本文提出了一种用于时变温度环境下复合材料夹层板结构动力学响应的数值仿真分析方法。首先,利用基于分段剪切变形理论的板单元建立了考虑热环境影响的复合材料夹层板结构有限元模型。然后,利用时变结构时间有限元方法计算了时变温度环境下复合材料夹层板结构的动力学响应。最后,对动态响应进行了时频分析,并与由理论模态分析方法计算出的固有频率参考值进行对比,验证了本文提出的方法的有效性与精确性。本文提出的数值仿真分析方法可以有效地预示时变温度环境下复合材料夹层板结构的热振响应,为热环境下复合材料结构设计提供了理论基础。更多还原

【Abstract】 The composite structure has been widely used in the aerospace engineering. When the aircraft is flying at high speed in the atmosphere, the aerodynamic heat load will change the dynamic characteristic and dynamic response of the composite structure. At present, the numerical simulation of the dynamic response of composite structures in constant temperature environment has been studied by scholars, while the numerical simulation in the time-varying temperature environment has not been studied yet. In this paper, a numerical simulation analysis method for the dynamic response analysis of composite sandwich plates in time-varying temperature environments is proposed. Firstly, the finite element model of composite sandwich plates is established utilizing the plate element based on the piecewise shear deformation theory. And then the dynamic response of composite sandwich plates under the time-varying temperature environment is calculated by using the time finite element method for time-varying structures. Finally, the time-frequency analysis of the dynamic response is performed and the results are compared with the reference natural frequencies obtained using the theoretical modal analysis, by which the validity and accuracy of the proposed method are verified. The numerical simulation analysis method proposed in this paper can effectively predict the thermal vibration response of composite sandwich plates in time-varying temperature environments, and provides a theoretical basis for the design of composite structures in thermal environment.更多还原