Measuring Multi-Directional Structure-Borne Sound Transfer Through a Fluid Filled and Pressurized Bellows or Flexible Hose

摘要

A test facility for characterizing multidirectional sound transfer properties is described. A flexible bellows is clamped between two blocks which vibrate as rigid bodies in the frequency range studied. The upper block is on the machine side of the mounting and serves as an excitation block. The lower block determines the force which would be exerted by the bellows on a high impedance pipe system, i.e., the blocked force. An annular block between two bellows the lower of which is connected to a heavy foundation, eliminates fluid borne sound transfer during tests. Transfer functions can be measured for separate excitation by each of six orthogonal translations and rotations.