Ship Diesel Engine-Generators Voltage Spectral Power Structure as a Parameter
Abstract
A method of technical diagnostics of ship diesel engine - generator installations is proposed. Spectral-power diagnostic parameters of the synchronous generator voltage and currents are used. The electric machine in this case is the multipurpose sensor of diagnostic parameters. A judgment on the quality of the operational processes in diesel engine cylinders and its technical condition is possible on the basis of these parameters. This method is applicable to piston compressor installations with the electric drive. On the basis of such parameters like rotating torque, angular speed and angular acceleration it is possible to estimate the quality of the operating process in cylinders of a diesel engine, a condition of its cylinder-piston group and crank gear mechanism. The investigation was realized on the basis of diesel-generator with a linear load. The generator operation was considered for the case of constant RL load. Together with the above mentioned a condition of bearings of synchronous machines, uniformity of its air gap, windings of the electric machine were estimated during the experiments as well.The frequency spectrum of the stator current of the generatorwas researched and analysed. In this case the synchronous machine is becoming a rather exact multipurpose diagnostic sensor. The signal of the non-uniformity in the operation process of the diesel engine cylinders and its technical condition is the increasing of the amplitudes of typical frequencies.
Keywords: |
Diesel engines; Generators; Torque measurement; Vibration measurement
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Developed by Institute of Industrial Electronics and Electrical Engineering of RIGA TECHNICAL UNIVERSITY