Research On Micro-nano Satellite Layout Optimization Design Method

With the rapid development of space technology and the increasing demand for engineering applications,higher requirements for shorter research period and higher design quality have been exposed to the overall design of satellites.Satellite layout design,as an important part of satellite overall design,directly concerns the overall performance,development cost and system design quality.In this paper,the satellite layout optimization design(SLOD)methodology and its application in micro-nano satellites are systematically stuided.Based on the reasearch on the fundamental issues,including problem formulation,geometric modeling and optimization methods,a complete set of multi-objective SLOD methodology is estabilished and applied in the multi-objective layout optimization design of ‘TianTuo-1’(TT-1)nano-satellite.Firstly,the SLOD problem formulation is studied.Considering the design requirements of satellite overall mass distribution characteristic,a basic SLOD model is established.For the micro-nano satellite,the thermal effecitve area method is introduced to formulate the design indicator of the heat flux uniformity of thermal field.By taking the thermal performance into account,a multi-objective SLOD model is proposed based on the basic model,which provides a propoer mathematical formulation for the following reaserch on the layout optimization algorithms.Secondly,the geometric modeling methods for satellite layout components are studied.The applications in SLOD of three geometric representation methods,including finite-circle method(FCM),level-set function(LSF)and Phi function method,are mainly discussed.The existing layout interference algorithm requires that rectangular components must be placed orthogonally.To release this limitation,the corresponding layout interference algorithms are developed based on the above three geometric representation methods.Theorectically,they can deal with the overlap calculation problems where the components of arbitrary shapes are placed under arbitrary angles.Besides,CMA(Compatibility,Maintainability and Accessibility)constraint is firstly proposed to control the minimum distance between any two components in SLOD problems,and three minimum distance control approaches are proposed and developed based on the above three layout inteference algorithms,respectively.The effectiveness of the proposed inteference algorithms are validated by two layout cases.Furthermore,the performance of all these inteference algorithms are compared,and their advantages and disadvantages are analyzed in detail.Thirdly,the layout optimization algorithms for solving SLOD problems are studied.Based on particle swarm optimization(PSO),two types of hybrid layout optimization algorithms are proposed by combining gradient-based sequential quadratic programming(SQP),where accelerated PSO(APSO)algorithm is our focus.By combining smart normal constraint(SNC)method with PSO,a smart multi-objective layout optimization algorithm SNC-APSO is proposed to directly generate the Pareto front of SLOD problems.The effectiveness and robustness of the proposed layout optimization algorithms are verified by several layout tests.Finally,the application of SLOD methodology in the layout design of TT-1 nano-satellite is studied.According to the system design requirements and the special rules for special functional components,a multi-objective multi-constraint SLOD model is established by comprehensively considering satellite system mass characteristics and thermal performance.FCM and Phi function are used to represent satellite layout components and handle geometric constraints(CMA constraint and non-overlap constraint),repsectively.Then SNC-APSO algorithm is adopted to solve the multi-objective layout optimization problem.The Pareto optimal layout solutions of TT-1 with all constraints being satisfied are obtained,which confirm the feasibility and validity of the proposed SLOD methodology.To sum up,two key issues in SLOD technology are systematically studied in this paper,which constitute a complete set of multi-objective SLOD methodology with SLOD problem formulation together,and applied in the layout design problems of TT-1 satellite.The research work in this paper can provide a reference and guiding significance when implementing the layout design of newly developed micro-nano satellites.