Assessment of operating loads is often approached as an inverse process using vibration response data and some form of system model to reconstruct external forces. Any mismatch in dynamic behavior between the model and the real system may distort the estimated loads. However, if the changes in system behavior are of interest, then those changes may be characterized through force reconstruction as equivalent loads acting in conjunction with the original external inputs. While these system changes may be linear in nature, the concept may be extended to nonlinear behavior, including intermittent contact between components. A modal based methodology for localization and reconstruction of inputs at potentially unmeasured locations is applied to the characterization of local system changes through their equivalent loading. An analytical study of a simple M-C-K system subject to contact nonlinearity is presented for validation. An experimental study is then presented using a multi-plate structure subject to impact loading and an unmodeled contact condition.

中文翻译：

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使用 SVD 模态滤波方法重建超出有限测量位置的非线性接触力

操作载荷的评估通常被视为使用振动响应数据和某种形式的系统模型来重建外力的逆过程。模型和真实系统之间动态行为的任何不匹配都可能使估计的载荷失真。然而，如果系统行为的变化是有意义的，那么这些变化可以通过力重建表征为与原始外部输入一起作用的等效载荷。虽然这些系统变化本质上可能是线性的，但这个概念可以扩展到非线性行为，包括组件之间的间歇性接触。一种基于模态的方法，用于在潜在的未测量位置定位和重建输入，用于通过等效载荷表征局部系统变化。对受接触非线性影响的简单 MCK 系统进行了分析研究以进行验证。然后使用受冲击载荷和未建模接触条件的多板结构进行实验研究。