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Measuring misalignment of valve seats using eddy current inspection method

Ali, Firdaus (2015) Measuring misalignment of valve seats using eddy current inspection method. Masters thesis, Universiti Tun Hussein Onn Malaysia.


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Valve seat inserts are one of the vital part of the valve train in internal combustion engines, as they are the interface between the valve and the cylinder head. Valve and valve seat embeds together serve to seal off the combustion chamber regulating the inlet and exhaust gases. The valve seat insert avoids immediate contact of the valve with the cylinder head and absorbs part of the combustion heat which is transfered to the valve by passing it on to the cylinder head. Therefore, misalignment of the valve seat during manufacturing could result in engine failure. This project proposes a valve seat insert misalignment measurement using the concept of eddy current inspection method. Eddy current inspection method permit flaw detection in a large variety of conductive materials, either ferromagnetic or non-ferromagnetic. Simulation to study the change in induced current density and magnetic density around the valve seat and cylinder head due to the magnetic field generated by an exciting coil was conduct using COMSOL Multiphysics 4.4. Based on the simulation result, it is observed that the change in gap width between valve seat and cylinder head will interfere the eddy current path which caused in the change of induced current density and magnetic flux density.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ255-265 Heat engines
Depositing User: Normajihan Abd. Rahman
Date Deposited: 13 Mar 2016 08:27
Last Modified: 13 Mar 2016 08:27
URI: http://eprints.uthm.edu.my/id/eprint/7715
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