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On the completeness of interface descriptions and the consistency of blocked forces obtained in situ

机译：关于接口描述的完整性和原位获得的阻塞力的一致性

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摘要

Blocked forces can be used to describe, independently, the operational characteristics of a vibratory source. Their use within a computational model avoids the need to represent explicitly the complex mechanisms that lead to vibratory excitation. To obtain and apply an experimental blocked force with confidence it is important that likely sources of error are known, and measures of their severity are available. In this paper we introduce the notions of completeness and consistency, and detail their role in the introduction of systematic errors in a blocked force characterisation. Their mathematical origins are described and criteria to quantify their severity are proposed; the Interface Completeness Criterion (ICC), and the Measurement Consistency Criterion (MCC). These are illustrated through numerical and experimental examples. Completeness is related to the interface description adopted in a source characterisation (i.e. the number of degrees of freedom used). The ICC represents the quality of an interface description and can be quantified from in situ measurements, i.e without having to remove the source from its assembly. Consistency is related to the underlying dynamics shared by active and passive quantities (whether measured or modelled). The issue of consistency is more general, completeness being a special case, and so a single criterion is hard to formulate. When an inconsistency arises between the blocked force of a vibration source and its corresponding free interface frequency response function matrix, the MCC provides a quantitative indication of its severity. Importantly, many of the concepts discussed apply equally in the context of experimental dynamic sub-structuring.
机译：阻塞力可用于独立地描述振动源的操作特性。它们在计算模型中的使用避免了需要明确表示导致振动激励的复杂机制。为了获得并施加实验阻挡力，令人信心是可能的错误来源是重要的，并且可以获得其严重程度的测量。在本文中，我们介绍了完整性和一致性的概念，并详细介绍了在阻止力表征中引入系统误差的作用。他们描述了他们的数学起源，并提出了量化严重程度的标准;接口完整性标准（ICC）和测量一致性标准（MCC）。这些通过数值和实验例示出。完整性与源表征中采用的接口描述有关（即使用的自由度的数量）。 ICC表示接口描述的质量，并且可以从原位测量中量化，即，不必从其组件中移除源。一致性与由主动和被动量共享的底层动态（无论是测量还是建模）有关。一致性的问题更为一般，完整性是一个特殊情况，因此单一标准很难制定。当振动源的阻塞力和其相应的自由界面频率响应函数矩阵之间产生不一致时，MCC提供了其严重性的定量指示。重要的是，讨论的许多概念在实验动态子结构的上下文中同样适用。

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