The prediction of the sound radiated by vibrating structures and the layout of measures to reduce it, is a key issue for maintaining appropriate comfort in residential buildings, for guaranteeing the operability of sensitive machinery in production and testing and for the provision of appropriate conditions at working places. For the prediction the excitation, the transmission and the radiation...

A novel resonant metamaterial solution is designed and applied to a vehicle in order reduce the structure-borne noise interior compartment due first acoustic tyre resonances around 230 Hz. This control consists of metal 3D printed elements rear wheel arches as potential alternative commonly used dynamic damper solutions, which are typically installed on suspension or body case severe issue. The...

Abstract The trap of multi-ion frequency standard is an ideal candidate for a new generation ground and space-borne timekeeping systems, which has high signal-to-noise ratio, low drift rate excellent long-term stability. non-ideal characteristic radio-frequency potential one the dominant factors that restrict performance ion standard. In this study, finite element numerical analysis method used...

The quanti cation and utilization of coupling e ects in a prototypical structural acoustic system are examined in this paper. In typical systems, the coupling mechanisms are manifested in two ways. The rst leads to the transfer of energy from an ambient eld to an adjacent structure and is often responsible for exogenous structural excitation. The second involves the transfer of energy from the ...

we propose a method for medical image denoising using calculus of variations and local variance estimation by shaped windows. this method reduces any additive noise and preserves small patterns and edges of images. a pyramid structure-texture decomposition of images is used to separate noise and texture components based on local variance measures. the experimental results show that the proposed...