The use of NVH analysis provides essential benefits towards designing vehicles for ride comfort and quietness, an increasingly competitive advantage in today's global automotive market. Requirements for NVH analysis at increasingly higher excitation frequencies is driving NVH modeling promoters beyond practical limits for conventional NVH methods. This paper examines details behind conventional...

Europa’s interior structure may be determined by relatively simple and robust seismo-acoustic echo sounding techniques. The strategy is to use ice cracking events or impacts that are hypothesized to occur regularly on Europa’s surface as sources of opportunity. A single passive geophone on Europa’s surface may then be used to estimate the thickness of its ice shell and the depth of its ocean by...

Noise, Vibration and Harshness (NVH) analysis has presented a formidable computational challenge in the last several years. Accurate prediction of automobile frequency response at higher frequencies requires FE models which have millions of DOF. For obtaining frequency response over a broad frequency range, only the modal frequency response approach has been practical, and only vector supercomp...

A multi-scale paradigm is proposed that utilizes periodic, small-scale, integral compliant mechanisms within larger-scale structures for the attenuation of vibro-acoustic response. Amplification principles serve as the basis for the design of these mechanisms in achieving reduced energy transmission. The spectral finite element method is exploited for a force–velocity and energy flow analysis o...

Cardboard liners are often installed within automotive drive shafts to reduce radiated noise over a certain frequency range. However, the precise mechanisms that yield noise attenuation are not well understood. To overcome this void, a thin shell (under free boundaries) with different cardboard liner thicknesses is examined using analytical, computational and experimental methods. First, an exp...