某型号仪器舱组合体联合动强度试验方法

针对某型号导弹仪器舱组合体结构和设备的联合动强度考核需求，开展组合体的动强度试验方法研究:设计专门的气瓶过载弹性加载装置，实现了气瓶过载力的等效模拟；通过整舱振动试验边界模拟和传递特性分析，验证了噪声激励振动传递与机械振动传递的差异性，提出采用大刚度模拟边界代替级间段真实边界与仪器舱组合进行联合动强度试验的方法；针对3个重点结构部段提出各自的试验条件，并通过预试验和归一化输入响应的比较分析确定了舱段不同部位结构和设备的联合考核方法。该试验方法可以有效模拟由发动机脉动和气动噪声引起的声振环境，避免产品过试验，达到对舱段结构及设备的动强度考核和设备支架动特性及放大倍数评估的目的。

Method for combined dynamic strength test of an integral instrument cabin assembly

In view of the demands of the combined dynamic strength assessment of a missile instrument cabin assembly’s structures and equipment, an integral cabin assembly’s dynamic strength test method was studied. A special elastic loading device for overload of the gas cylinder was designed and the equivalent simulation of cylinder overload was realized. Through the whole cabin vibration test boundary simulation and transfer characteristics analysis, the difference between noise excitation vibration transfer and mechanical vibration transfer was verified. Large stiffness simulation boundary, instead of the real boundary of inter-stage, was used to combine with the instrument cabin for combined dynamic strength test. The test conditions of the three key structural parts were proposed, and the combined assessment methods of the structure and equipment in different parts of the cabin were determined by comparing the preliminary test and the normalized input response. This test method could effectively simulate the acoustic vibration environment caused by engine pulsation and aerodynamic noise to avoid product overtest. The purposes of evaluating the dynamic strength of the cabin structure and equipment and the dynamic characteristics and magnification of the equipment support were achieved.