基于实测数据的卫星公路运输动力学特性仿真分析方法

为解决卫星运输跑车试验耗时耗力的问题，采用仿真方法研究了卫星在公路运输过程中的动力学特性。先基于大量实测数据，建立仿真分析输入谱；再通过Patran/Nastran有限元软件建立包装箱–卫星的联合仿真模型，对经过组合体模态试验修正后的模型进行了模态分析和随机振动响应分析，得到了模型的前6阶模态振型以及关键部位的加速度和应力响应RMS值。结果表明:联合仿真模型各部位的应力RMS值远低于材料屈服极限，卫星结构具有足够的安全裕度。该仿真分析方法可以准确有效地分析卫星在运输过程中经受的力学环境，为卫星结构及包装箱设计提供依据。

Method for simulating dynamic characteristics of satellite by road transportation based on measured data

In order to solve the problem of intensive power and time consumption during running test before satellites were transported to the launch site, dynamic characteristics of satellites in the process of road transportation was studied in this paper. The simulation analysis input spectrum was established by processing a large number of measured data. The Patran/Nastran finite element software was used to establish the co-simulation model of the packing box and satellite. Modal analysis and random vibration response analysis were carried out by the modal test of the assembly. The first six modal shapes, as well as the acceleration and stress response RMS values of the key parts of the model were obtained. The results indicate that the stress RMS value of each part of the co-simulation model is much lower than the material yield limit, and the satellite structure has enough safety margin. This method may accurately and effectively analyze the mechanical environment encountered by satellites in the process of road transportation, and provide a basis for the design of satellite structure and packing box.