基于Modelica的载人航天器多学科集成建模仿真

Multi-disciplinary Integrated Modeling and Simulation of Manned Spacecraft Based on Modelica

针对目前载人航天器系统仿真验证多局限于单一专业层面而系统性不强的问题,基于统一建模语言Modelica,首先建立了各专业设备模型,然后将设备模型进行组装,构建了多学科集成的系统模型。利用该系统模型对航天器系统方案的仿真结果表明:模型有效;统一采用Modelica语言建模,所有模型基于同一套方程系统求解,可避免异构模型参数传递带来的精度损失;以设备为最小粒度构建系统模型,可保证系统模型架构与航天器真实物理架构的一致性。

At present, there are many tools and methods for single-specialty modeling and simulation in space domain. However, for complex multi-systems such as spacecraft, single-specialty simulation is not enough to verify the system accurately and comprehensively. For multi-disciplinary coupling verification, the method of co-simulation is usually adopted. But the method of co-simulation is suitable for the subsystem-level coupling, not for the device-level multi-specialty coupling. In addition, the model of co-simulation is dispersed in various professional tool software, thus the model is not easy to manage and reuse. Even worse, co-simulation results in unnecessary loss of accuracy. Targeting the above-mentioned problems, a multi-specialty coupling model based on unified language was proposed in this paper, and a multi-specialty coupling system model at the device level was built to make a more accurate and comprehensive simulation analysis of the spacecraft system. In this way, the coupling effect between the specialties could be fully considered with the minimum granularity of the device. Unified model expression was adopted to manage the model uniformly. Based on the same set of equations, the accuracy loss of the co-simulation could be avoided.