14.2.1. Squeeze-Film Damping
In a squeeze-film damper, a body is moving (vibrating) perpendicularly to a surface with a thin gas film between the body and the surface. The moving surface squeezes the gas film and causes the fluid to flow towards its borders; that is, the flow is pressure-driven. Since the gas film is thin, the fluid velocity is much larger in the x- and y-directions compared to the z-direction motion of the surface. Also, the pressure profile across the gap can be considered constant. The velocity profile across the air gap plays an important role in characterizing the damping. In idealistic conditions, this velocity profile is parabolic; see Figure. 14.2a. The velocity v is zero at the surfaces. This type of flow is called ...
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