航天返回与遥感
航天返迴與遙感
항천반회여요감
SPACECRAFT RECOVERY & REMOTE SENSING
2014年
4期
36-43
,共8页
孙德伟%杨佳文%赵野%李博
孫德偉%楊佳文%趙野%李博
손덕위%양가문%조야%리박
隔振系统%复刚度%多目标优化%最优解集%空间相机
隔振繫統%複剛度%多目標優化%最優解集%空間相機
격진계통%복강도%다목표우화%최우해집%공간상궤
isolation system%complex stiffness%multi-object optimization%pareto optimal set%space camera
为了减小卫星发射和在轨阶段的振动对空间相机成像品质的影响,文章对空间相机隔振系统的建模和优化方法进行了研究。使用复刚度模型表示隔振器,用拉格朗日方法建立系统动力学方程。选用了系统质心位置的加速度和转角的均方根值作为目标函数,采用多目标优化算法NSGA-Ⅱ在随机振动条件下对隔振系统的进行优化。优化结果给出了隔振系统的刚度系数和耗散系数的最优解集。根据某空间遥感器的实例计算出一组最优隔振器参数,验证了这种优化方法的可行性。这个最优解的集合可以作为隔振系统结构选型和初始设计的输入条件,提高隔振器前期优化设计的效率和计算的准确性。
為瞭減小衛星髮射和在軌階段的振動對空間相機成像品質的影響,文章對空間相機隔振繫統的建模和優化方法進行瞭研究。使用複剛度模型錶示隔振器,用拉格朗日方法建立繫統動力學方程。選用瞭繫統質心位置的加速度和轉角的均方根值作為目標函數,採用多目標優化算法NSGA-Ⅱ在隨機振動條件下對隔振繫統的進行優化。優化結果給齣瞭隔振繫統的剛度繫數和耗散繫數的最優解集。根據某空間遙感器的實例計算齣一組最優隔振器參數,驗證瞭這種優化方法的可行性。這箇最優解的集閤可以作為隔振繫統結構選型和初始設計的輸入條件,提高隔振器前期優化設計的效率和計算的準確性。
위료감소위성발사화재궤계단적진동대공간상궤성상품질적영향,문장대공간상궤격진계통적건모화우화방법진행료연구。사용복강도모형표시격진기,용랍격랑일방법건립계통동역학방정。선용료계통질심위치적가속도화전각적균방근치작위목표함수,채용다목표우화산법NSGA-Ⅱ재수궤진동조건하대격진계통적진행우화。우화결과급출료격진계통적강도계수화모산계수적최우해집。근거모공간요감기적실례계산출일조최우격진기삼수,험증료저충우화방법적가행성。저개최우해적집합가이작위격진계통결구선형화초시설계적수입조건,제고격진기전기우화설계적효솔화계산적준학성。
In order to reduce the vibration impact on the image quality of space camera during the satellite launching and on-orbit, an optimization method of the isolation system is studied in this paper. Firstly, the complex stiffness model is applied to describe the isolator and the system dynamic equation is established by using Lagrange method. Then, the square root values of acceleration and angle in the center of mass selected as object function, a multi-object optimal algorithm-NSGA-Ⅱis employed to optimize the isolation system un-der random vibration environment. At last, the pareto optimal set of stiffness and dissipation coefficients of isolation system is exhibited in the optimization result. A set of optimal parameters of vibration isolator is cal-culated through an example of a space camera and the feasibility of this optimization method is verified. This pareto optimal set can be used as a basic criterion of structure selection and initial design of flexible supporters to improve the accuracy of calculation and the efficiency of optimization design of the isolator.