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首页> 外文期刊>Journal of Biomechanics >Effect of vibration magnitude, vibration spectrum and muscle tension on apparent mass and cross axis transfer functions during whole-body vibration exposure.
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Effect of vibration magnitude, vibration spectrum and muscle tension on apparent mass and cross axis transfer functions during whole-body vibration exposure.

机译：全身振动暴露期间，振动强度，振动谱和肌肉张力对表观质量和横轴传递函数的影响。

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Twelve seated male subjects were exposed to 15 vibration conditions to investigate the nature and mechanisms of the non-linearity in biomechanical response. Subjects were exposed to three groups of stimuli: Group A comprised three repeats of random vertical vibration at 0.5, 1.0 and 1.5 ms(-2) r.m.s. with subjects sitting in a relaxed upright posture. Group B used the same vibration stimuli as Group A, but with subjects sitting in a 'tense' posture. Group C used vibration where the vibration spectrum was dominated by either low-frequency motion (2-7 Hz), high-frequency motion (7-20 Hz) or a 1.0 ms(-2) r.m.s. sinusoid at the frequency of the second peak in apparent mass (about 10-14 Hz) added to 0.5 ms(-2) r.m.s. random vibration. In the relaxed posture, frequencies of the primary peak in apparent mass decreased with increased vibration magnitude. In the tense posture, the extent of the non-linearity was reduced. For the low-frequency dominated stimulus, the primary peak frequency was lower than that for the high-frequency dominated stimulus indicating that the frequency of the primary peak in the apparent mass is dominated by the magnitude of the vibration encompassing the peak. Cross-axis transfer functions showed peaks of about 15-20% and 5% of the magnitudes of the peaks in the apparent mass for x- and y-direction transfer functions, respectively, in the relaxed posture. In the tense posture, cross-axis transfer functions reduced in magnitude with increased vibration, likely indicating a reduced fore-aft pitching of the body with increased tension, supporting the hypothesis that pitching contributes to the non-linearity in apparent mass.
机译：12位坐着的男性受试者被暴露于15种振动条件下，以研究生物力学响应非线性的性质和机制。受试者受到三组刺激：A组包括三个重复的随机垂直振动，分别在0.5、1.0和1.5 ms（-2）r.m.s。受试者以放松的直立姿势坐下。 B组使用与A组相同的振动刺激，但受试者处于“紧张”姿势。 C组使用的振动频谱由低频运动（2-7 Hz），高频运动（7-20 Hz）或1.0 ms（-2）r.m.s决定。正弦波在表观质量的第二个峰值的频率（约10-14 Hz）上加到0.5 ms（-2）r.m.s.随机振动。在放松姿势下，表观质量的主峰频率随振动幅度的增加而降低。在紧张的姿势中，非线性程度减小了。对于低频控制的刺激，其主峰频率低于高频控制的刺激，这表明视在质量中主峰的频率主要由包围该峰的振动大小决定。横轴传递函数在松弛状态下分别显示了x和y方向传递函数的视在质量中的峰值的大约15-20％和5％。在紧张的姿势下，横轴传递函数随着振动的增加而减小，这可能表示随着张力的增加，人体的前后俯仰减小，从而支持了俯仰有助于表观质量非线性的假设。

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