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<p>The model construction of a large and complex system consisting of substructures has been an important issue in many engineering fields. Component Mode Synthesis (CMS) is the one of dynamic substructuring methods defining interconnecting relations between substructures and reduces the order of a model. In a launch vehicle (LV) and payload assembled system, coupled load analysis (CLA) is performed with an LV-payload CMS model to estimate dynamic loads or verify the structural reliability under the launch loads. Forces at the interface of CLA results with a primal assembly CMS such as the widely used Craig–Bampton method (CB) become&#xa0;zero, because the force equilibrium is naturally satisfied in the primal assembly. In this study, flexibility-based CMS method (F-CMS), which can obtain interconnecting forces explicitly, is applied to model the LV-payload model. To verify the F-CMS model of the LV-payload, each finite-element (FE) model is updated with modal test data, and the modal and dynamic response analyses are performed. The dynamic properties and responses of the LV-payload system are well predicted by the F-CMS model. Unlike primal CMS methods, the F-CMS model gives interconnecting forces explicitly without additional computation procedure, while the model is the reduced CMS model.</p>

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Dual Assembly Coupled Load Analysis Using Flexibility-Based Component Mode Synthesis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月21日

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  • Seung-Chan Lee,
  • Yoon Seok Kim,
  • Byung Duk Kang,
  • Sung Hwan Park,
  • Jae-Hung Han

摘要

The model construction of a large and complex system consisting of substructures has been an important issue in many engineering fields. Component Mode Synthesis (CMS) is the one of dynamic substructuring methods defining interconnecting relations between substructures and reduces the order of a model. In a launch vehicle (LV) and payload assembled system, coupled load analysis (CLA) is performed with an LV-payload CMS model to estimate dynamic loads or verify the structural reliability under the launch loads. Forces at the interface of CLA results with a primal assembly CMS such as the widely used Craig–Bampton method (CB) become zero, because the force equilibrium is naturally satisfied in the primal assembly. In this study, flexibility-based CMS method (F-CMS), which can obtain interconnecting forces explicitly, is applied to model the LV-payload model. To verify the F-CMS model of the LV-payload, each finite-element (FE) model is updated with modal test data, and the modal and dynamic response analyses are performed. The dynamic properties and responses of the LV-payload system are well predicted by the F-CMS model. Unlike primal CMS methods, the F-CMS model gives interconnecting forces explicitly without additional computation procedure, while the model is the reduced CMS model.