Multibody Models Generated from Natural Language

IF 2.6 2区 工程技术 Q2 MECHANICS
Johannes Gerstmayr, Peter Manzl, Michael Pieber
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Abstract

Computational models are conventionally created with input data, script files, programming interfaces, or graphical user interfaces. This paper explores the potential of expanding model generation, with a focus on multibody system dynamics. In particular, we investigate the ability of Large Language Model (LLM), to generate models from natural language. Our experimental findings indicate that LLM, some of them having been trained on our multibody code Exudyn, surpass the mere replication of existing code examples. The results demonstrate that LLM have a basic understanding of kinematics and dynamics, and that they can transfer this knowledge into a programming interface. Although our tests reveal that complex cases regularly result in programming or modeling errors, we found that LLM can successfully generate correct multibody simulation models from natural-language descriptions for simpler cases, often on the first attempt (zero-shot).

After a basic introduction into the functionality of LLM, our Python code, and the test setups, we provide a summarized evaluation for a series of examples with increasing complexity. We start with a single mass oscillator, both in SciPy as well as in Exudyn, and include varied inputs and statistical analysis to highlight the robustness of our approach. Thereafter, systems with mass points, constraints, and rigid bodies are evaluated. In particular, we show that in-context learning can levitate basic knowledge of a multibody code into a zero-shot correct output.

Abstract Image

从自然语言生成多体模型
计算模型通常通过输入数据、脚本文件、编程界面或图形用户界面创建。本文以多体系统动力学为重点,探讨了扩展模型生成的潜力。我们特别研究了大型语言模型(LLM)从自然语言生成模型的能力。我们的实验结果表明,LLM(其中一些已在我们的多体代码 Exudyn 上进行过训练)超越了单纯复制现有代码示例的能力。实验结果表明,LLM 对运动学和动力学有基本的了解,并能将这些知识转化为编程界面。虽然我们的测试表明,复杂的案例经常会导致编程或建模错误,但我们发现 LLM 可以成功地根据自然语言描述生成正确的多体仿真模型,而且通常是在第一次尝试(零次)时就能生成。在对 LLM 的功能、Python 代码和测试设置进行基本介绍后,我们对一系列复杂度不断增加的示例进行了总结评估。我们从 SciPy 和 Exudyn 中的单质量振荡器开始,包括各种输入和统计分析,以突出我们方法的鲁棒性。之后,我们对带有质点、约束和刚体的系统进行了评估。我们特别展示了上下文学习可以将多体代码的基本知识转化为零次正确输出。
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来源期刊
CiteScore
6.00
自引率
17.60%
发文量
46
审稿时长
12 months
期刊介绍: The journal Multibody System Dynamics treats theoretical and computational methods in rigid and flexible multibody systems, their application, and the experimental procedures used to validate the theoretical foundations. The research reported addresses computational and experimental aspects and their application to classical and emerging fields in science and technology. Both development and application aspects of multibody dynamics are relevant, in particular in the fields of control, optimization, real-time simulation, parallel computation, workspace and path planning, reliability, and durability. The journal also publishes articles covering application fields such as vehicle dynamics, aerospace technology, robotics and mechatronics, machine dynamics, crashworthiness, biomechanics, artificial intelligence, and system identification if they involve or contribute to the field of Multibody System Dynamics.
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