Vibration Analysis of Diesel Engine Muffler by using FEA software

Vibretion

Automotive exhaust system primarily consists of exhaust system as its main component. Mufflers are used to reduce noise and pass exhaust generated in engine. Mufflers are cantilever structures which forms part of exhaust system. They are subjected to various structural, thermal and vibration loads. Various failures are seen in mufflers due to vibration from engine and road excitations. This vibration failure occurs due to resonant frequencies occurring in defined frequency range. Vertical accelerations are dominant in Mufflers due to road excitations. Design/ CAD modeling of existing muffler will be done using CATIA V5 software by reverse engineering. Meshing (Discretization) of model will be done using Ansys Package. Modal Analysis will be done to find out Natural Frequencies and Modes shapes of Muffler. Impact hammer test will be done to find out mode shapes and Natural frequencies using accelerometer and FFT setup. Existing design will be modified to reduce vertical vibrations by use of stiffener ribs.FEA and Experimental methods will be repeated as above. Comparative analysis will be done with FEA and Experimental results for validation purpose. Conclusion and Future scope will be suggested.

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