Buller förorsakat av maskiner och utrustning

Kommittébeteckning: SIS/TK 110 (Akustik och buller)
Källa: CEN
Svarsdatum: den 27 nov 2018
Se merSe mindre
 

This document specifies methods of predicting sound exposure levels of shooting sound for a single shot at a given reception point. Guidelines are given to calculate other acoustic indices from the sound exposure level. The prediction is based on the angular source energy distribution of the muzzle blast as defined in ISO 17201-1 or calculated using values from ISO 17201-2.

This document applies to weapons with calibres of less than 20 mm or explosive charges of less than 50 g TNT equivalent, at distances where peak pressures, including the contribution from projectile sound, are less than 1 kPa (154 dB).

NOTE National or other regulations, which could be more stringent, can apply.

Kommittébeteckning: SIS/TK 110 (Akustik och buller)
Källa: ISO
Svarsdatum: den 18 jan 2019
Se merSe mindre
 

The proposed standard deals with cases where a vibrating component (a source of structure-borne sound

or vibration) is attached to a passive structure (or receiver) and is the cause of vibration in, or structureborne

sound radiation from, the assembly. Examples are pumps installed in ships, servo motors in

vehicles or machines and plant in buildings. Almost any vibrating component can be considered as a

source in this context.

It is necessary to measure vibration at all contact degrees of freedom (connections between the source

and receiver). Therefore, the standard can only be applied to assemblies for which such measurement is

possible.

The standard is restricted to assemblies whose frequency response functions (FRFs) are linear and time

invariant.

The source may be installed into a real assembly or attached to a specially designed test stand (as

described in 4.2).

The standard method has been validated for stationary signals such that the results can be presented in

the frequency domain. However, the method is not restricted to stationary signals and with appropriate

data processing it is also applicable to time-varying signals such as transients and shocks (provided

linearity and time invariance of the FRFs is preserved).