CAJ | 학술논문

针对高超声速飞行器热力环境引起的壁板振动疲劳问题，旨在研究温度变化对壁板结构振动特性及疲劳寿命的影响。首先分析壁板三维瞬态耦合传热和热应力，获得壁板的温度场和应力场；然后依次探讨温度场、应力场及其耦合效应对壁板振动模态与疲劳寿命的影响。分析过程中，考虑温度变化造成弹性模量减小对壁板刚度的影响，引入由热环境引致的附加热应力刚度矩阵以及附加热变形刚度矩阵。结果显示：温度变化引起的材料力学性能退化使壁板结构各阶次模态频率随之下降，温度梯度对振动模态的影响明显，热力耦合效应使壁板的振动疲劳寿命缩短。
침대고초성속비행기열력배경인기적벽판진동피로문제，지재연구온도변화대벽판결구진동특성급피로수명적영향。수선분석벽판삼유순태우합전열화열응력，획득벽판적온도장화응력장；연후의차탐토온도장、응력장급기우합효응대벽판진동모태여피로수명적영향。분석과정중，고필온도변화조성탄성모량감소대벽판강도적영향，인입유열배경인치적부가열응력강도구진이급부가열변형강도구진。결과현시：온도변화인기적재료역학성능퇴화사벽판결구각계차모태빈솔수지하강，온도제도대진동모태적영향명현，열력우합효응사벽판적진동피로수명축단。
According to the vibration fatigue problem of hypersonic aircraft under the thermal-mechanical environment, impacts of the temperature change on vibration properties and fatigue life of aircraft panel are studied. Firstly, the temperature field and stress field are obtained by analyzing three dimension transient coupling thermal conduct and thermal stress. Then, impacts of the temperature and stress and theirs coupling on panel’ s vibration mode and fatigue life are discussed. During the analysis, the stiffness of panel material influenced by the temperature is considered. Initial stress additional stiffness matrix caused by thermal stress and initial displacement stiffness matrix caused by thermal strain are introduced. Results indicate that different modes the panel are going to be decreased because the performance is worsen by the action of temperature. Impacts of temperature grade on vibration mode are obvious. The vibration fatigue life is shortened because of the coupling effect.