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This experimental rotor dynamics platform was designed and fabricated for Texas A&M University to conduct research in fault detection techniques for motors driving different types of loads including a centrifugal pump, parallel shaft gearbox, MFS rotor deck, and a turbine/blade assembly.
The machine consists of an inverter driven induction motor, torque sensor/encoder, adjustable rotor deck, parallel shaft gearbox (GDS) fitted with rolling element bearings, and a single stage centrifugal pump with associated head tank, isolation valves, modulating valve, flow meter, pressure gauges, and piping. The pump can either be mounted at the output end of the shaft at the rotor deck or to the output of the gearbox. The gearbox would have to be removed to make space to couple the pump directly to the rotor deck output.
1. The following faults can be introduced within the drive motor:
Rotor misalignment end-to-end at each end bell.
Rotor bow.
Rotor unbalance.
Faulted bearings.
Electrical faults can be introduced by modifying the windings at the discretion of the user.
2. The commercial torque-sensing unit includes an integral speed sensor.
3. The rotor deck is a modified MFS module with features described under the Machinery Fault Simulator.
4. The gearbox is a standard GDS with features described under the Gearbox Dynamics Simulator.
5. The single stage bronze centrifugal pump is intended to pump relatively clean, non-hazardous fluids. The liquid is supplied from a large plastic head tank mounted slightly above the level of the pump. The suction side of the pump is fitted with an isolation valve and pressure gauge. The discharge side of the pump is fitted with a modulating valve, pressure gauge, and flow meter. The modulating valve is operated by air (3 to 15 psig.) and controlled by a 4 to 20 ma signal provided by the user. Typical experiments include the following:
Alter the head by changing the elevation of the head tank.
Restrict flow to the pump suction with the manual valve beneath the head tank.
Restrict the discharge from the pump by adjusting the modulating valve.
Vary the speed of the pump.
Alter the impeller clearance.
Install a worn and/or damaged impeller.
Develop pump performance curves.
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