Attenuation is frequency- dependent and is strongly affected by ________

It is when a time-varying disturbance is applied to a mechanical system. The disturbance can be a periodic and steady-state input, a transit input or a random input.

Tools and measures make it possible to noticeably reduce vibration levels of ship board structures, attenuate vibration activity of propulsion plant machinery and thus diminish vibratory energy transmitted to ship hull, which is a major source of excessive under water radiated noise levels.

It is when energy of a vibrating system is gradually dissipated by friction and other resistances. The vibrations gradually reduces or change in frequency or intensity or cease and the system rest in its original

An oscillation of the parts of fluid or an elastic solid whose equilibrium has been distributed.

An intrinsic property of rocks causing dissipation of energy as seismic waves propagate through the subsurface

A measure of the effects of air pressure variations on the experiment.

Occurs when a mechanical system is set in motion with an initial input and allowed to vibrate freely. The mechanical system vibrates at one or more of its natural frequencies and damps down to motionlessness.

As the sound moves away from the source, the area that the sound energy covers becomes larger and thus sound intensity decreases. This is independent of frequency and plays a major role in sound propagation situations.