Architecture - Acoustic Notes - School Of Architecture And

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Floors, ceilings and windows also have their own natural frequencies. Typical values for floors are in the range 10-30 Hz depending on size and type of construction. People in buildings are more aware of vibrations transmitted via the floor than from any other part of the structure. It is important therefore that the natural frequency of the floor does not coincide with the range of maximum sensitivity (4-8 Hz) for vertical vibrations of the human body at which whole-body resonance occurs. The maximum amplitude usually occurs in the centre of the floor.

There is concern about the safety and efficiency of the driver or operator subjected to vibration; secondly, there is the effect of vibration levels on the comfort of passengers; and thirdly, there is often great concern amongst members of the public about vibration produced in buildings. including domestic dwellings adjacent to roads or railway lines or near to air routes. A great variety of industrial machinery produces vibration which is experienced by people at work. Particular sources which can cause vibration to be experienced by the occupants of nearby buildings and thus often give rise to concern amongst members of the public include heavy-duty air compressors, forge hammers, pile driving and quarry blasting operations.

Separate scales are used for vibrations in the vertical and horizontal directions. 5 mm/s. 1 Hz) and higher amplitudes than Reiher and Meister. 1 to 100, which are related to the intensity. The effect of a vibration can be assessed from its K-value: K K K K = 0 1 - lower limit of perception = 1 -allowable in industry for any period of time = 10 - allowable only for a short time =100 - upper limit of strain allowable for the average man The K-values may be read off charts of frequency against amplitude, similar to the Reiher-Meister scales, or they may be calculated in terms of displacement amplitude A and frequency f.

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