Mode-matching without root-finding: Application to a dissipative silencer

Mode-matching without root-finding: application to a dissipative silencer.

This article presents an analytic mode-matching approach suitable for modelling the propagation of sound in a two-dimensional, three-part, ducting system. The approach avoids the need to find roots of the characteristic equation for the middle section of the duct (the component) and is readily applicable to a broad class of problems. It is demonstrated that the system of equations, derived via ...

A Dissipative Integral Sliding Mode Control Redesign Method

This paper develops a new method of integral sliding mode control redesign for a class of perturbed nonlinear dissipative switched systems by modifying the dissipativity-based control law that was designed for the unperturbed systems. The nominal model is considered affine with matched and unmatched perturbations. The redesigned control law includes an integral sliding-based control signal such...

A mode matching method for modeling dissipative silencers lined with poroelastic materials and containing mean flow.

A mode matching method for predicting the transmission loss of a cylindrical shaped dissipative silencer partially filled with a poroelastic foam is developed. The model takes into account the solid phase elasticity of the sound-absorbing material, the mounting conditions of the foam, and the presence of a uniform mean flow in the central airway. The novelty of the proposed approach lies in the...

Finding Flexible Patterns in a Text - an Application to 3d Molecular Matching

Finding certain regularities in a text is an important problem in many areas, for instance in the analysis of biological molecules such as nucleic acids or proteins. In the latter case, the text may be sequences of amino acids or a linear coding of 3D structures, and the regularities then correspond to lexical or structural motifs common to two, or more, proteins. We first recall an earlier alg...

Simplified techniques for predicting the transmission loss of a circular dissipative silencer