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PT 500.11: Crack Detection in Rotating Shaft Kit

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Crack Detection in Rotating Shaft Kit

Crack Detection in Rotating Shaft Kit Crack Detection in Rotating Shaft Kit Crack Detection in Rotating Shaft Kit

Product Details

Technical Description 
Cracks due to material fatigue are very dangerous for rotating machines. Early detection of any crack is therefore essential before permanent rupture and often fatal consequences can occur. The crack influences the vibration behaviour of the shaft by changing its rigidity. Using suitable analysis software, this change can be registered and inspection of the machine organised in good time.
In the experiment, the crack is simulated by an asymmetric flange joint. Variable tightening of the flange bolts produces a temporary gaping of the butt joint, which closely approximates to the behaviour of a crack. The accessory set-up includes two shafts of different lengths: one short and one long. The short shaft simulates a protruding shaft end, and is loaded with the PT 500.14 belt drive. The long shaft is used in conjunction with a retainer bearing from PT 500.10 and an inertia disk from the base unit to investigate the effects of a crack in a shaft on the elastic rotor.
The accessory set-up is mounted on the base plate of  the machinery diagnostic base system PT 500.
To measure and evaluate the experiment, the computerised vibration analyser PT 500.04 is required. It includes all the necessary sensors, a measurement amplifier and analysis software to record the vibration phenomena.  
Learning Objectives / Experiments

- Change in characteristic vibration behaviour (natural
  frequency, resonance speed, amplitude and phase
  of vibrations) due to a crack
- Crack identification from the change in vibration
- Detection of cracks in rotating shafts at the
  protruding shaft end
- Understanding and interpreting frequency spectra
- Use of a computerised vibration analyzer
In conjunction with a retainer bearing (e.g. from PT 500.10 - elastic shaft accessory set-up):
- Detection of cracks in rotating shafts (the elastic
* Vibration behaviour of shaft with radial crack1
* Identification of damage


[1] Investigation of the vibration behaviour of a cracked shaft
[2] Crack adapter in flange form
[3] Simulation of the crack by opening bolt joints
[4] 4 different sized cracks can be simulated
[5] Short shaft to simulate a protruding shaft end
[6] Long shaft to simulate an elastic rotor
[7] PT 500.14 (belt drive) generates required bending torque
[8] Accessory set-up for PT 500 machinery diagnostic training system
[9] Stackable box for all components

Technical Data
Flange diameter: D=90mm
6 hexagon flange bolts M8x20
- diameter: D=20mm
- short shaft: L=85mm
- long shaft: L=200mm
- max. permissible bending torques
  short shaft for belt pulley: 15.9Nm
  long shaft for mass disk: 3.9Nm

Dimensions and Weight
l x w x h : 600 x 400 x 120 mm (box)
Weight : approx. 6 kg

Scope of Delivery
1 pick-up disk
1 long shaft
1 short shaft
1 centering arbor for alignment of shafts in
   experimental set-up
6 bolts
1 clamp set
1 storage box with foam inlay
1 instruction manual
Order Details
052.50011  PT 500.11  Crack Detection
                      in Rotating Shaft Kit

Available accessories
PT 500 -- Machinery Diagnostic System, Base Unit
PT 500.02 -- Instrumentation Kit
PT 500.04 -- Computerised Vibration Analyser
PT 500.10 -- Elastic Shaft Kit
PT 500.14 -- Belt Drive Kit

SELKA GmbH, Hamburg
Grindelallee 188, 20144 Hamburg / Germany
Tel.: + 49 (0) 40 343453 |  Fax: +49 (0) 40 63657075
E-Mail:   |  Internet:

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