The most popular strategy to reduce the complexity of flexible multibody systems modeled using the Floating Frame of Reference Formulation (FFRF) is based on reduced-order models (ROM) derived through component modes. In this paper, we propose the use of global modes to build a feasible modal basis of reduction. The global modes are derived from the assembled system and satisfy the reference conditions necessary to prevent rigid-body motions inside the floating frames of the flexible components. Furthermore, the global modes are consistent with the constraints provided by the mechanical joints. As for the classic Component Mode Synthesis (CMS) methods, the proposed reduction pertains only to the elastic coordinates while the gross motion coordinates are kept in the final ROM. This approach allows for describing the deformation field of the whole mechanisms using linear combinations of global shapes. As a consequence, a reduced number of global modal intensities is required and the computational burden is significantly decreased compared to the unreduced model.

减少使用参考配方浮动框架（FFRF）建模的柔性多体系统的复杂性的最流行策略是基于通过组件模式导出的降阶模型（ROM）。在本文中，我们建议使用全局模式来构建可行的减少模式基础。全局模式是从组装后的系统派生的，并且满足防止柔性组件的浮动框架内的刚体运动所需的参考条件。此外，整体模式与机械接头所提供的约束是一致的。至于经典的分量模式合成（CMS）方法，建议的缩减仅适用于弹性坐标，而总运动坐标则保留在最终ROM中。这种方法允许使用整体形状的线性组合来描述整个机构的变形场。结果，与未简化的模型相比，需要减少的全局模态强度数量，并且显着降低了计算负担。