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Ex-Putin aide Mikhail Lesin died of 'blunt force trauma'

With the rapid development of modern industrial engineering, the various manufacturing machine, transportation machine are all developing to high speed, high efficiency, high precision, and automation. However, with the increase of equipment's power and speed, the intensity of the vibration source in engineering practice is increasing constantly, the harm is also obvious because of vibration and noise. Vibration does the great harm to operators, precision instruments, machinery equipment and architectural structure, at the same time, vibration and the noise is also bad for people's living condition and physical and mental health. Therefore, harm from vibration and noise is drawing more and more attention from researchers from various countries. Vibration and noise are harmful in most cases, vibration hazards are regarded as one of the seven environmental hazards. The hazards of vibration and noise can be divided into the following aspects: 1. Harm to human bodies When vibration is over certain strength, it will do harm to human bodies. People will have insomnia, lumbago, backache, fatigue, impotence, headache, dizzy, drowsy, gastro-intestinal, low appetite and weak attention id they are under the environment of large vibration and noise for a long time, it is also easy to make mistakes and technical error, what's worse, it will make people's senses blunt and cause physical illness.

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