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An approach to mixed-fidelity system simulation of extravehicular activities

机译：覆盖物活动混合保真系统仿真方法

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The National Aeronautics and Space Administration (NASA) is currently developing the next generation of spacesuits for use in future exploration missions. This effort, referred to as the Exploration Extravehicular Mobility Unit (xEMU), has been underway since 2015 with the goal of demonstrating the new technologies during a mission to the International Space Station (ISS).Due to the complexity of the xEMU system, and particularly its portable life support system (PLSS), computer simulations are heavily relied on in the development process, from dynamic loads analysis to software verification. The models of the physical systems that are currently being used for system-level simulations are mostly empirical, where the underlying formulas are mathematical fits to test or simulation data. An advantage of this approach is the fact that these models are very performant and can be used in real-time applications such as user interface testing and operator training.The research presented in this paper describes a different approach to modeling and simulation. A simulation tool focused on life support systems for human spaceflight in general and PLSSs in particular has been under development at the Technical University of Munich (TUM) since 2006. The spacesuit specific variant of this tool is called The Virtual Spacesuit (V-SUIT) and is now being utilized in the current spacesuit development process at the NASA Johnson Space Center (JSC). In contrast to the previously mentioned empirical models, V-SUIT uses a first-principles-based, bottom up modeling approach, where basic physical, chemical or biological effects are modeled at the lowest level and the component and system models are created using these fundamental building blocks. This enables the simulation to account for effects, and especially off-nominal situations, that may not be within the range of validity of the empirical models.This paper presents the structure of and the rationale behind V-SUIT itself as well as a status report on the ongoing effort to integrate it with the existing simulation systems in use at JSC, which is based on Trick/GUNNS. As a proof of concept, a single component model from V-SUIT, that of the spacesuit water membrane evaporator (SWME), has been integrated with NASA's simulation tool.Results include comparisons of the performance of the two simulation systems and a description of challenges that were encountered during implementation. The paper closes with an outlook towards the future developments that are planned for V-SUIT within the xEMU development program.
机译：美国国家航空航天局（NASA）目前正在开发下一代斯普斯特，以便在未来的勘探任务中使用。这项努力被称为勘探广泛的流动性单位（XEMU），自2015年以来一直在进行目的，目的是在对国际空间站（ISS）的使命期间展示新技术.due到XEMU系统的复杂性，以及特别是其便携式寿命支持系统（PLS），计算机模拟在开发过程中严重依赖于动态负载分析到软件验证。目前用于系统级模拟的物理系统的模型主要是经验性的，其中底层公式是测试或模拟数据的数学符合。这种方法的一个优点是这些模型非常表现，并且可以用于诸如用户界面测试和操作员培训的实时应用中。本文提出的研究介绍了建模和仿真的不同方法。一般来说，一个仿真工具，专注于人类航天的寿险支持系统，特别是慕尼黑技术大学（Tum）自2006年以来一直在开发。该工具的Spacesue特定变体称为虚拟Spaceup（V-Suit）现在正在美国国家航空航天局约翰逊航天中心（JSC）目前的Spaceuit开发过程中。与先前提到的经验模型相比，V合品使用基于第一原理的自下而上的建模方法，其中基本的物理，化学或生物学效果在最低级别和组件和系统模型采用这些基础建模建筑模块。这使得模拟能够考虑效果，尤其是非名义情况，这可能不在经验模型的有效范围内。本文介绍了V-Suit本身的结构和理由以及状态报告。在持续努力与JSC中使用的现有仿真系统集成，基于技巧/枪支。作为概念证明，V-SIT的单个组件模型，SPACESUIT水膜蒸发器（SWME）已与NASA的仿真工具集成。结果包括两个模拟系统的性能的比较和挑战的描述。在实施期间遇到过。本文结束了展望XEMU开发计划中的V服的未来发展。

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