Vibration transmissibility characteristics of reinforced viscoelastic pipes employing complex moduli master curves

Fibre and wire reinforced flexible viscoelastic pipes are used in situations where their static and dynamic characteristics provide much better performance than metallic pipes. Because of their vibration and shock attenuation characteristics, these viscoelastic pipes are used as flexible conduits in applications where it is desirable to minimize the transmission of vibration and structure-borne sound to the surroundings. In analyzing the vibration and structure-borne sound transmission and the vibrational power flow through systems that incorporate such pipes, knowledge of the mathematical models that satisfactorily predict the vibration transmissibility characteristics of the viscoelastic pipes is advantageous. It is shown that the use of the frequency and temperature dependent complex moduli of these pipes with the elementary and the more exact theories of the propagation of axial and flexural vibration through viscoelastic rods and beams provides satisfactory prediction of the vibration transmissibility characteristics of the reinforced viscoelastic pipes.