航天器推进系统模块化建模方法

为了研究由复杂增压气路和推进剂供应管路组成的航天器推进系统的动力学问题,基于AMESim软件平台,构建了模块化、可扩展的航天器推进系统仿真模型UPSSim.模型中,增压气路采用分段集中参数模型,推进剂供应管路采用分布参数模型,并考虑了系统各组件与环境的换热.对某型轨控发动机的变轨过程进行了仿真,UPSSim能准确模拟该发动机变轨过程中系统参数的变化,计算结果与设计性能参数、飞行遥测数据吻合较好.仿真结果表明,本文所采用的模块化建模与仿真方法适用于复杂管网的建模,在航天器推进系统仿真建模与仿真领域具有较好的应用前景.

Modular modeling of spacecraft propulsion system

In order to investigate the system dynamics of spacecraft propulsion system with complex pressurization pipelines and propellant feed pipelines,the Unified Propulsion System simulator(UPSSim) was developed,which consists of a modular and extensible framework based on AMESim software.The pressurant pipelines were separated into several nodes,with each node using lumped parameter model;while the propellant feed pipelines used distributed parameter model.Heat transfer between components and environment was also taken into account.Simulation of a certain UPS during GEO insertion shows that the UPSSim can obtain the parameter variations accurately,and the results are in good agreement with design parameters and measurements.Simulation result indicates that the method proposed is sufficient for the modeling of complex pipelines and has good application prospect for spacecraft propulsion system dynamic simulation.