Lecture 14 - Vibration 10-29

Lecture 14 - Vibration 10-29 - Human vibration:...

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Human vibration: Understanding the effects and Using appropriate methods to prevent disorders
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Examples of vibration exposure
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An Overview of Human Vibration Introduction • A bit of History What is a Vibration? • Definition • Physical characteristics • Analysis • Measurement • Evaluation Effects of vibration on humans • Effects on health - Whole-body vibration - Hand-arm vibration • Effects on performance Applications • Seats • Hand tools Summary Techniques for vibration Factors in human vibration measurements
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Vibration : Introduction A bit of History Before being considered as a nuisance vibration was known to alleviate pain, and its therapeutic effects were used by the Chinese, the Greeks and the Roman. These beneficial effects are still used for pain relief and functional rehabilitation. Vibration was first applied manually. Then, mechanical devices were designed to stimulate the whole body. During the XIXth century a large diversity of vibrating machines were invented and their utilization was almost exclusively reserved for medical application. Progressively, localized vibration was replacing vibration of whole body and high frequency stimuli were replacing "trepidations" similar to those generated by a "stage- coach". However, In the early XVIIIth century, Ramazzini, the first occupational physician, pointed out that vibration exposure had noxious effects. These armful effects have actually emerged with industrialization. A complex Problem Sound: air transmission - stimulation of cochlea solid contact transmission: - Motion of body parts - Stimulation of many mechanoreceptors
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Definition(s) of a Vibration Vibration is a motion: deterministic or random My daughter’s definition: Vibration is a form of specalolycle. It depends on the kind of vibration,
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Lecture 14 - Vibration 10-29 - Human vibration:...

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