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Apparent mass matrix of standing subjects exposed to multi-axial whole-body vibration

机译：暴露于多轴全身振动的站立受试者的表观质量矩阵

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This paper describes the experimental characterisation of the apparent mass matrix of eight male subjects in standing position and the identification of nonlinearities under both mono-axial and dual-axis whole-body vibration. The nonlinear behaviour of the response was studied using the conditioned response techniques considering models of increasing complexity. Results showed that the cross-axis terms are comparable to the diagonal terms. The contribution of the nonlinear effects are minor and can be endorsed to the change of modal parameters during the tests. The nonlinearity generated by the vibration magnitude is more evident in the subject response, since magnitude-dependent effects in the population are overlaid by the scatter in the subjects' biometric data. The biodynamic response is influenced by the addition of a secondary vibration axis and, in case of dual-axis vibrations, the overall magnitude has a marginal contribution.Practitioner Summary: We have measured both the diagonal and cross-axis elements of the apparent mass matrix. The effect of nonlinearities and the simultaneous presence of vibration along two axes are smaller than the inter-subject variability.
机译：本文描述了八名男性站立姿势的表观质量矩阵的实验表征，以及在单轴和双轴全身振动下的非线性识别。考虑条件复杂度增加的模型，使用条件响应技术研究了响应的非线性行为。结果表明，横轴项与对角项可比。非线性效应的影响很小，可以在测试过程中认可模态参数的变化。振动幅度产生的非线性在对象响应中更加明显，因为总体中幅度依赖的影响被对象生物特征数据中的散布所覆盖。生物动力学响应受辅助振动轴的影响，并且在双轴振动的情况下，总体幅度具有边际贡献。从业者摘要：我们已经测量了视在质量矩阵的对角轴元素和交叉轴元素。非线性的影响以及沿两个轴同时振动的影响小于对象间的可变性。

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