Tuned self-damping convoluted conduit.

摘要

The individual convolutions of the conduit have variations of physical characteristics such that the physical characteristics which react to vibration of each convolution is different from the physical characteristics of at least some of its neighbouring convolutions. The conduit thus does not have a uniform resonant frequency throughout its length. The variations in the convolutions are large enough to have resonance at different frequencies to assure self-damping between adjacent convolutions and small enough to maintain a max. uniformity of flexing. The variations are variations in at least one of height, thickness, form, and pitch of successive convolutions.