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dc.contributor.authorFeng, Ming-Faen_US
dc.date.accessioned2014-03-14T21:20:54Z
dc.date.available2014-03-14T21:20:54Z
dc.date.issued1992-03-05en_US
dc.identifier.otheretd-10122005-134445en_US
dc.identifier.urihttp://hdl.handle.net/10919/39786
dc.description.abstract

This research introduces a new method of diagnosing the internal condition of a reciprocating air compressor. Using only measured load torques and shaft dynamics, pressures, temperatures, flow rates, leakages, and heat transfer conditions are quantified to within 5%.

The load torque acting on the rotor of the machine is shown to be a function of the dynamics (instantaneous position, velocity, and acceleration) of the driving shaft, the kinematic construction, and the internal condition of the machine. If the load torque, the kinematic construction of the machine, and the dynamics of the rotor are known, then the condition of the machine can be assessed.

A theoretical model is developed to describe the physical behavior of the slider-crank mechanism and the shaft system. Solution techniques, which are based on the machine construction, crankshaft dynamics, and load torque measurements, are presented to determine the machine parameters. A personal computer based system used to measure the quantities necessary to solve for the machine parameters and the quantities used to compare with calculations is also documented.

The solution algorithm for multi-stage compressors is verified by decoupling the load torque contributed by each cylinder. Pressure data for a four-stage two-cylinder high pressure air compressor (HPAC) is used. Also, the mathematical model is proven feasible by using measured angular velocity of the crankshaft and direct measurements of the load torque of a single stage, single cylinder air compressor to solve for the machine parameters.

With this unintrusive and nondestructive method of quantifying the operating parameters, the cylinder pressures, operating temperatures, heat transfer conditions, leakage, and power consumption of a reciprocating air compressor can be evaluated.

en_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V856_1992.F463.pdfen_US
dc.subjectMachine parts Failures Mathematical models.en_US
dc.subjectAir-compressors Mathematical models.en_US
dc.subject.lccLD5655.V856 1992.F463en_US
dc.titleFault diagnosis and prediction in reciprocating air compressors by quantifying operating parametersen_US
dc.typeDissertationen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairMitchiner, Reginald G.en_US
dc.contributor.committeememberKnight, Charles Eugeneen_US
dc.contributor.committeememberLeonard, Robert G.en_US
dc.contributor.committeememberSingh, Mahendra P.en_US
dc.contributor.committeememberWicks, Alfred L.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10122005-134445/en_US
dc.date.sdate2005-10-12en_US
dc.date.rdate2005-10-12
dc.date.adate2005-10-12en_US


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