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针对推进器支架安装在艇体两侧式布局的软式飞艇,研究飞艇艇体与推进支架结构的动力学特性。通过建立飞艇艇体与推进器支架结构的有限元模型,分析不同艇体内压下,艇体与推进支架结构系统的模态特性,以及结构系统在推进螺旋桨不同转速下的动力响应,最终得到艇体与推进支架结构的固有频率、振型及响应函数随艇体内压的变化关系。仿真结果表明飞艇艇体的存在使得整个结构系统的固有频率降低,产生耦合振动。最后结合分析结果对艇体与推进支架结构设计提出了建议。
Aiming at the airship with propeller bracket mounted on both sides of the hull, the dynamic characteristics of the airship hull and propulsion structure are studied. Through the establishment of the finite element model of the airship hull and the propeller support structure, the modal characteristics of the hull and the propulsion structure under different hull pressures, the dynamic responses of the structural system at different speeds of the propeller are analyzed, and finally the hull The relationship between natural frequency, mode shape and response function of body and propulsion structure with pressure inside hull. Simulation results show that the existence of the airship hull makes the natural frequency of the entire structural system decreases, resulting in coupling vibration. In the end, the design of hull and propulsion frame is put forward based on the analysis results.