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Impact Noise on a Wall

So far in this book impacts have been considered as occurring on a floor. What about their occurring on a wall? This is not such a far-fetched problem, as one may face a ball being playfully bounced against a wall by a child, but also a noisy switch being fixed to a wall. More to the point, the acoustician usually looks at the impact sound performance of the floor prior to deciding on the noise reduction measures to be applied to the piece of equipment to be implemented on it, so a similar acoustic assessment of a wall on which a piece of equipment (e.g., a switch or a tap) will be installed is of interest. This is of particular importance when dealing with the noise generated by the operation of such a piece of equipment.

A small impact machine (known as pendulous hammer) has been developed for that matter and tested on various types of structures, including wooden structures [58].

Standards and Regulations

There are quite a number of standards and regulations pertaining to impact noise transmission (e.g., [21, 25-29]). A few of them are given in the various chapters of this book regarding the main types of construction. Typically, there often are maximum impact sound level values required for specific types of construction (e.g., dwellings, schools, etc.).

In addition, some sustainable development standards (e.g., HQE in France) require the floor covering to have been subjected to an impact sound measurement inside the test room.

The Swiss Engineers and Architects standard SIA 181 has taken provisions regarding the matter of noise induced by the manipulation of service equipment. A small impact machine (known as a pendulous hammer) has been standardized to assess the impact noise performance of the walls on which such equipment is mounted [59].

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