Numerical and Analytical Investigation in Radiated Noise by a Shock-Absorber

Numerical and analytical modelling of entropy noise in a supersonic nozzle with a shock

Analytical and numerical assessments of the indirect noise generated through a nozzle are presented. The configuration corresponds to an experiment achieved at DLR by Bake et al. [F. Bake, C. Richter, B. Mühlbauer, N. Kings, I. Röhle, F. Thiele, B. Noll, The Entropy Wave Generator (EWG): A reference case on entropy noise, Journal of Sound and Vibration 326 (2009) 574-598] where an entropy wave ...

Numerical and analytical investigation of the indirect combustion noise in a nozzle

Numerical Optimization of Radiated Engine Noise with Uncertain Wavenumbers

The purpose of this paper is to study the optimal design of the acoustic liner to minimize fan noise radiation from commercial aircraft engine nacelles. There have been numerous studies of this problem from an engineering perspective (e.g., [12, 26, 27] and references therein). In [8, 11], the search for the liner material minimizing engine noise radiation was treated as an optimal control prob...

Analytical and numerical investigation of escape rate for a noise driven bath.

We consider a system-reservoir model where the reservoir is modulated by an external noise. Both the internal noise of the reservoir and the external noise are stationary, Gaussian, and are characterized by arbitrary decaying correlation functions. Based on a relation between the dissipation of the system and the response function of the reservoir driven by external noise, we numerically examin...

A numerical model for ground-borne vibrations and re- radiated noise in buildings from underground railways

An efficient and modular numerical prediction model is presented to predict vibrations and re-radiated noise in buildings due to metro trains. The approach comprises of three weakly coupled problems: the dynamic vehicle-track-tunnel-soil interaction problem, the dynamic soil-structure interaction problem and the calculation of the acoustic response inside the rooms. The three-dimensional dynami...

Analytical and Numerical Investigation of FGM Pressure Vessel Reinforced by Laminated Composite Materials

In this research, the analytical and numerical investigation of a cylindrical shell made of functionally graded materials (FGMs) reinforced by laminated composite subjected to internal pressure is presented. Using the infinitesimal theory of elasticity, the analytical solution of stress and strain in vessels made of FGMs is studied first. It is assumed that the elasticity modulus follows a powe...