Sound radiation from structural discontinuities

Sound Radiation Characteristics for Structural Damage Identification

This paper investigates the sound power radiated from a cracked plate. The sound power is obtained by using a lumped parameters model-based acoustics theory and vibration responses obtained by using the finite element method. It is shown that the vibration mode shapes and crack angle are closely related to the sound radiation characteristics, which can be applied to detect damages such as the c...

Robust feedback control of flow-induced structural radiation of sound

Heatwole, Craig M. PhD., Purdue University, May 1997. Robust Feedback Control of Flow Induced Structural Radiation of Sound. Major Professors: Dr. Robert J.Bernhard and Dr. Matthew A. Franchek, School of Mechanical Engineering. A significant component of the interior noise of aircraft and automobiles is a result of turbulent boundary layer excitation of the vehicular structure. In this work, ac...

Experimental Relationship Between Tire's Structural Wave Propagation and Sound Radiation

Sound radiation from nested cylindrical shells

ABSTRACT Fluid-loaded nested cylindrical shells are modelled using a doubled-walled cylindrical shell structure closed at each end by circular end plates and excited by a transverse force at one end. The effects of various influencing factors on the radiated sound power are examined corresponding to non-concentricity of the cylindrical shells, entrained fluid and rib connections in the annular ...

Shape from Depth Discontinuities

We propose a new primal-dual framework for representation, capture, processing, and display of piecewise smooth surfaces, where the dual space is the space of oriented 3D lines, or rays, as opposed to the traditional dual space of planes. An image capture process detects points on a depth discontinuity sweep from a camera moving with respect to an object, or from a static camera and a moving ob...