Sound and vibration are two of the physical agents that have been much in the news, mainly in relation to health and safety at work. As a physical agent, affecting humans, any vibration can be characterised in two main groups. As an intermittent or impact (shock) or a continuous vibration (vibration) which may be variable. People recognise and respond in different ways. Mechanical vibration and shock does not necessarily refer to machinery though most vibrations in the world are man-made. However, earthquakes and wind-induced vibration are environmental sources of mechanical vibration as opposed to acoustic vibrations.
展开▼
