PERFORMANCE EVALUATION OF MUFFLER BY USING FEM AND FFT ANALYZER

Abstract

Various types of failures and cracks are seen in mufflers due to vibration from engine and road excitations. These vibrations cause localized stresses in muffler. The natural frequency and stresses are analyzed by finite element method. Hence in order to increase the natural frequency and reduce the induced stresses, the structural modification in muffler is proposed and subsequent analysis is carried out. The obtained stresses are below the yield stress limit in X as well as Y direction. Modal analysis is performed to evaluate natural frequency of the muffler. The baffles, perforated pipes, body are the mounting parts tend to vibrate as the excitation frequency of the source (engine).This vibration failure occurs due to resonant frequencies occurring in defined frequency range. The ‘frequency match’ could lead to a response detrimental to the life of the structure. FEA techniques are used in this work to avoid resonance. Physical experimentation is performed on using FFT analyzer. The aim of this project is to study the existing industrial Muffler. Modeling of existing muffler was created by using CREO Parametric 2.0 software.FEM is carried out for both existing and modified muffler by using ANSYS. Then frequencies, mode shapes and stresses are found. The results obtained from simulation are compared with experiment result by using FFT analyzer and the results are compared with each other.