Measuring misalignment of valve seats using eddy current inspection method
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 inse...
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| Format: | Thesis |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7715/ http://eprints.uthm.edu.my/7715/1/FIRDAUS_BIN_ALI.pdf |
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| Summary: | 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. |
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