DANSK DSF/ISO/FDIS 20270 PDF

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).