Journal Bearing Demonstration Apparatus Model MT 132

Journal Bearing Demonstration Apparatus Model MT 132

Sci-tech Journal Bearing Demonstration Apparatus Model MT 132 allows students to study the performance of a journal bearing during different test conditions. It is a plain steel shaft encased in a clear acrylic shell and directly driven by an electric motor. The bearing is freely supported on the motor shaft and sealed with a rubber diaphragm. The clearance is especially large to clearly show the oil in the bearing. Supplied with the equipment is a container of suitable oil.

A control unit adjusts the motor speed, which can run in both directions. A display shows the motor speed.

An adjustable reservoir supplies oil to a low pressure region at both ends of the bearing.

The bearing contains 12 equi-spaced pressure tappings around its circumference and four additional ones along its topside and on a vertical radial plane. All are connected by light and flexible plastic tubes to the rear manometer panel, to clearly show the pressure head of oil at all 16 points at all times.

Students load the bearing by attaching weights (included) to arms connected to the bearing.

A strong steel frame with a worktop holds the bearing, the motor, the manometer panel and the control unit.

Size: 120cm x 85cm x 180cm (LxWxH)
Weight: 85 kg

Item Description

Features

• Acrylic bearing allows clear observation of the oil film at all times.

• Pressure profiles, along and around the bearing, continuously monitored on large manometer panel

• Theoretical pressure profiles (Sommerfeld analysis) may be tested and compared with practical results

• Exaggerated clearance makes oil wedge clearly visible

• Shaft/bearing eccentricity easily visible and can be determined by experiment

• Provides striking demonstration of self-excited vibrations (half-speed whirl)

• Fully adjustable speed, direction and loads

Sci-tech Journal Bearing Demonstration Apparatus Model MT 132 allows students to study the performance of a journal bearing during different test conditions. It is a plain steel shaft encased in a clear acrylic shell and directly driven by an electric motor. The bearing is freely supported on the motor shaft and sealed with a rubber diaphragm. The clearance is especially large to clearly show the oil in the bearing. Supplied with the equipment is a container of suitable oil.

A control unit adjusts the motor speed, which can run in both directions. A display shows the motor speed.

An adjustable reservoir supplies oil to a low pressure region at both ends of the bearing.

The bearing contains 12 equi-spaced pressure tappings around its circumference and four additional ones along its topside and on a vertical radial plane. All are connected by light and flexible plastic tubes to the rear manometer panel, to clearly show the pressure head of oil at all 16 points at all times.

Students load the bearing by attaching weights (included) to arms connected to the bearing.

A strong steel frame with a worktop holds the bearing, the motor, the manometer panel and the control unit.

Sci-tech can supply the optional ‘Sci-Cal’ software & hardware interface which gives accurate real-time data capture, monitoring and display, calculation and charting of all important readings on a computer.

Technical Specifications

Specifications

  1. The Unit Consists of A Plain Steel Shaft Encased In Bearing & Directly Driven By A Small Electric Motor.
  2. The Bearing Is freely supported on the Shaft & Sealed at The Motor End.
  3. The Motor Speed Is precisely controlled and adjusted by specially designed control unit and can be run in both the direction.
  4. The Bearing Contains Twelve equi-spaced pressure tappings around its circumference and four additional once along its top side and on a vertical radial plane.
  5. All are connected by light and flexible plastic tubes to the rare manometer panel, so that pressure head of oil at all sixteen points can be clearly observed at all times.
  6. Oil is supplied to a low pressure region at both ends of the bearing by an adjustable reservoir fitted at the side of the rare panel.
  7. The bearing can be loaded by attaching various weights to the arms supported beneath it.
  8. Journal Diameter 50 mm Dia.
  9. Bearing Diameter 55 mm Dia.
  10. Weights: 4 Adjustable Weights.
  11. Recommended Oil- SAE 10 or equivalent
  12. Motor-D.C. Shunt Wound, Speed Range 500-3000 Rev./min.
  13. Manometer Panel-16 Tubes mounted on acrylic backboard.

 

 Experiment possibilities

  1. Measuring pressure profiles for chosen conditions and plotting the cartesian and polar pressure curves
  2. Measuring pressure profiles for chosen conditions and plotting the theoretical Sommerfeld curve
  3. Measurement of shaft speed and journal speed at the critical whirl
  4. All tests may be conducted for either direction of rotation of the shaft.

   

Demonstrations

  1. Observation of oil wedge (film thickness) and hence eccentricity variations for different speeds and loads
  2. Observation of the pressure profiles at these conditions
  3. Observation of the critical bearing whir

Model Number

MT 132

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