目的 针对我国超高声速飞行器的研究需求,开展在高温热流、强噪声的环境下加筋板的振动及疲劳特性研究。方法 基于耦合的有限元/边界元法计算加筋板在不同载荷作用下的动力学响应,重点研究加筋板的热模态频率随温度的变化规律,并结合功率谱密度分析结构应力随声压级和流速的变化规律。采用雨流计数法和Morrow平均应力模型,结合Miner线性累积损伤理论对结构进行疲劳寿命预估,并采用雨流循环矩阵（MRFM）与雨流损伤矩阵（MRFD）讨论应力循环块的分布与结构的损伤程度,分析热载荷、气动力载荷以及声载荷对结构疲劳寿命的影响规律。开展加筋壁板常温模态及声激振响应试验验证仿真计算的可靠性。结果 热载荷和声载荷对结构总应力的影响较大,气动力载荷对其影响较小。结构疲劳寿命随着温度的增高呈现先下降、后抑制回升的非单调演化,随声压级的增高而降低。结论 试验结果与仿真计算高度吻合,验证了多物理场耦合数值预估方法的可靠性。
Abstract
The work aims to investigate the vibration and fatigue characteristics of stiffened panels under high-temperature heat flux and strong noise environments to meet the research needs for hypersonic flight vehicles in China. Based on a coupled finite element/boundary element method, the dynamic response of stiffened panels under various loads was calculated, with particular focus on the variation of thermal modal frequencies with temperature. Power spectral density analysis was employed to examine how structural stress changed with sound pressure level and flow velocity. Fatigue life prediction was conducted using the rainflow counting method and Morrow's mean stress model combined with Miner's linear cumulative damage theory. The stress cycle distribution and structural damage level were analyzed through the Rainflow Cycle Matrix (MRFM) and Rainflow Damage Matrix (MRFD), respectively, to investigate the effects of thermal, aerodynamic, and acoustic loads on structural fatigue life. Modal tests at room temperature and acoustic excitation experiments were carried out to validate the reliability of simulation results. Thermal and acoustic loads significantly affected the total structural stress, while aerodynamic load had a relatively minor influence. The structural fatigue life exhibited a non-monotonic evolution of initially decreasing and then stabilizing with increasing temperature, and decreased as the sound pressure level increased. Experimental results show excellent agreement with simulations, confirming the reliability of the multi-physics coupled numerical prediction approach.
关键词
加筋壁板结构 /
热流载荷 /
声载荷 /
振动特性 /
疲劳寿命
Key words
stiffened panel structure /
heat flux load /
acoustic load /
vibration characteristics /
fatigue life
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