Abstract Experimentally validated models of a heavyweight reception plate using finite element methods (FEM) have been used to assess reception plate measurements of structure-borne sound power injected by single- and multiple-contact, broadband sources. Measurements and FEM indicated high velocity levels near corners and edges of the plate; hence the reception plate power was underestimated by up to ≈9 dB below 100 Hz when using velocity measurements in the central zone of the plate. To avoid this problem, a sampling strategy was developed using an area-weighting approach for the velocity measurements. Measurement of the reception plate power using the area-weighted velocity level gave errors that were less than 2 dB between 20 Hz and 2 kHz for both single- and multiple-contact sources. FEM simulations also identified an additional measurement constraint for a multiple-contact source representing white goods with either zero-phase or random-phase relationships between the four contact points. As the actual phase relationship is rarely known, potential bias can be avoided by excluding positions in the area between the contacts (typically the area underneath a machine) along with those within the estimated reverberation distance from each contact point.

中文翻译：

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用于量化机械结构声功率的接收板上的采样程序

摘要 使用有限元方法 (FEM) 的重型接收板的实验验证模型已被用于评估由单接触和多接触宽带源注入的结构传播声功率的接收板测量值。测量和 FEM 表明板角和边缘附近的高速水平；因此，在接收板的中心区域使用速度测量时，接收板功率在 100 Hz 以下被低估了高达 ≈9 dB。为了避免这个问题，开发了一种使用面积加权方法进行速度测量的采样策略。对于单接触源和多接触源，使用面积加权速度水平测量接收板功率的误差在 20 Hz 和 2 kHz 之间均小于 2 dB。FEM 模拟还为代表白色家电的多接触源确定了一个额外的测量约束，在四个接触点之间具有零相位或随机相位关系。由于很少知道实际的相位关系，因此可以通过排除触点之间区域（通常是机器下方的区域）中的位置以及距每个触点的估计混响距离内的位置来避免潜在偏差。