Stochastic Scenario Exploration with Constrained Parameters for Aircraft System Virtual Testing

Dennis Hillig, F. Thielecke
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Abstract

Future aircraft concepts are characterized by new technologies and highly automated, complex systems. Additionally, the time-to-market should improve to satisfy the demands. This emphasizes the role of new verification & validation methods (V&V) for future systems. There is a particular need to test for unexpected failures, but this typically includes the most effortful tasks also. Classical testing is a major method in that context and immense test spaces amplify the work- and time-intensive nature. Testing is conducted at late stages of the development process, such that found failures have a big impact. Therefore, novel test approaches are needed.This paper focuses on virtual testing and new test methods to explore the system behaviour and find unexpected failure scenarios early. A scenario-based approach should reduce the testing complexity by focusing on specific operational procedures. Although engineers can define complex scenarios, it is not trivial to construct consistent variations if parameters are interdependent. Therefore, the challenge to produce valid scenario variations to create explorative test trajectories is addressed. The presented concept defines symbolic parameters and constraints as part of the scenario modeling, such that computer-aided procedures can generate valid parameter sets. Moreover, an automation procedure is described to select valid stochastic values for exploration. The application of the method is outlined with an aircraft system use case. The concept is intuitive, produces valid results and is a good starting point for the exploration during virtual testing.
基于约束参数的飞机系统虚拟测试随机场景探索
未来的飞机概念以新技术和高度自动化、复杂的系统为特征。此外,上市时间应该改进以满足需求。这强调了未来系统中新的验证和确认方法(V&V)的作用。我们特别需要测试意外的故障,但这通常也包括最费力的任务。经典测试是这种情况下的主要方法,而巨大的测试空间放大了工作和时间密集的性质。测试是在开发过程的后期进行的,因此发现的失败会产生很大的影响。因此,需要新的测试方法。本文重点研究了虚拟测试和新的测试方法,以探索系统的行为和早期发现意外故障场景。基于场景的方法应该通过关注特定的操作过程来降低测试的复杂性。尽管工程师可以定义复杂的场景,但如果参数是相互依赖的,那么构建一致的变化并不是微不足道的。因此,解决了产生有效的场景变化以创建探索性测试轨迹的挑战。所提出的概念定义了符号参数和约束作为场景建模的一部分,以便计算机辅助程序可以生成有效的参数集。此外,还描述了一个自动选择有效的随机值进行勘探的过程。通过一个飞机系统用例概述了该方法的应用。该概念直观,结果有效,是虚拟测试过程中探索的良好起点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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