Structure-borne sound transmission from machines in buildings, part 1: Indirect measurement of force at the machine-receiver interface of a single and multi-point connected system by a reciprocal method

The analysis of structure-borne sound transmission is obscured by the compl icated nature of the dynamic interaction between source and:receiver at eac h contact point. There is little measured data because of the practical dif ficulties in directly measuring forces and moments at the contacts. This is particularly so in the case of moments, since there is not yet available a n accepted method of registration. Even in the case of forces, where commer cially transducers are available, it is seldom practical to insert transduc ers between the source and receiver without altering the installed conditio n. A :method is described whereby the force and moment induced powers from an installed machine are measured indirectly by a reciprocal method. In the companion paper, the validated method is used to measure the moment induce d power produced by a base sub-assembly. Hence, the relative importance of force and moment with respect to variation in machine excitation position o n a receiving structure is examined. (C) 1999 Academic Press.