论文部分内容阅读
在某新型卫星结构研制的初样阶段,建立了卫星初始设计的有限元模型.以主承力桁架结构中各梁的截面尺寸为设计变量,考虑整星模态频率和强度约束,建立了以结构重量最轻为目标的优化模型.应用二级多点逼近优化算法进行了结构优化计算,在每一个计算周期中,原结构优化问题先转化为具有较高精度的第1级多点近似问题,该问题则通过可由对偶法快速求解的第2级近似问题逼近.经过初步试算、设计改进和再优化3个阶段,设置并进行了一系列的优化计算,逐步明确了设计的方向和各结构参数的取值范围,得到了合理的可行方案,为该卫星平台结构初样的详细设计提供了参考,同时表明所采用的优化方法适用于工程结构优化问题.
In the initial phase of the development of a new type of satellite structure, a finite element model of the initial design of the satellite was established. Taking the cross-sectional dimension of each beam in the main load-bearing truss structure as the design variable and taking the modal frequency and the strength constraint of the entire star into account, And the structure weight is the lightest as the optimization model of the target.Using the second-order multi-point approximation optimization algorithm to optimize the structure, in each calculation cycle, the original structure optimization problem is transformed into the first-order multi-point approximation problem with higher accuracy , Which is approximated by a second-order approximation problem that can be quickly solved by the dual method.After a preliminary trial, design improvement and re-optimization three stages, set up and conducted a series of optimization calculations, and gradually clear the design direction and each The range of structural parameters is reasonable and the feasible scheme is obtained. It provides a reference for the detailed design of the prototype of the satellite platform structure. At the same time, it shows that the optimization method applied to the structural optimization of the project.