High supersonic vehicles are exposed to high temperature generated by aerodynamic heating. Thermal protection system structures are used on the skin of the fuselage and wings to prevent the transfer of high temperatures into the interior of the vehicle. Thin skin panels can be exposed to acoustic loads by high power engine noise and jet flow noise, which can cause sonic fatigue damage. Therefore, it is necessary to examine the behavior of supersonic/hypersonic vehicle skin structures under thermal-acoustic loads and to predict fatigue life. In this paper, thermal-acoustic testing of titanium specimens under thermal-acoustic load was performed. The response stress history of the specimen was obtained, and the fatigue life was predicted using the time and frequency domain fatigue life prediction method. The effect of the mean stress on the predicted results of the time and frequency domian fatigue life was analyzed. Stress history was generated using a sine series of random phases from stress PSD without phase information. The fatigue life in the generated stress history was predicted using the time and frequency domain fatigue life prediction methods. As the temperature increased, the mean stress of the response stress and the error in the frequency domain fatigue life prediction results increased. The error in the frequency domain fatigue life prediction results with the mean stress effect were greatly reduced by considering the completely reversed stress.

高超音速车辆暴露于由空气动力加热产生的高温。热保护系统结构用于机身和机翼的皮肤上，以防止高温传递到车辆内部。薄的皮肤面板可能会受到大功率发动机噪声和喷射流噪声的声学负载，这可能会导致声音疲劳损坏。因此，有必要检查超音速/超人车辆的皮肤结构在热声载荷下的行为并预测疲劳寿命。在本文中，进行了钛在热声载荷下的热声测试。获得了试样的响应应力历史，并使用时域和频域疲劳寿命预测方法预测了疲劳寿命。分析了平均应力对时间和频率domian疲劳寿命预测结果的影响。使用正弦随机序列从应力PSD生成应力历史，而没有相位信息。使用时域和频域疲劳寿命预测方法预测了生成的应力历史中的疲劳寿命。随着温度的升高，响应应力的平均应力和频域疲劳寿命预测结果的误差会增加。通过考虑完全逆向应力，可以大大降低频域疲劳寿命预测结果中具有平均应力效应的误差。使用时域和频域疲劳寿命预测方法预测了生成的应力历史中的疲劳寿命。随着温度的升高，响应应力的平均应力和频域疲劳寿命预测结果的误差会增加。通过考虑完全逆向应力，可以大大降低频域疲劳寿命预测结果中具有平均应力效应的误差。使用时域和频域疲劳寿命预测方法预测了生成的应力历史中的疲劳寿命。随着温度的升高，响应应力的平均应力和频域疲劳寿命预测结果的误差会增加。通过考虑完全逆向应力，可以大大降低频域疲劳寿命预测结果中具有平均应力效应的误差。