investigation of bending vibrations in rotors

Description:

• Critical speed and resonance are phenomena that play essential roles in many machines and systems.
• In particular, resonance states with impermissibly high vibration amplitudes can occur in rotating shafts and rotors at certain speeds, which in some cases can even lead to destruction of the machine.
• To prevent this, the system is operated well above or below the critical speed and driven quickly through the critical speed range.
• Therefore, knowledge of critical speeds and vibration modes is important in the design and operation of machines with bending elasticity in their rotors.
• The TM 620experimental unit can be used to clearly demonstrate phenomena such as resonance, self-centring and vibration modes.
• The model-like structure of the experimental rotor as a thin, elastic shaft with rigid mass disks allows simple theoretical comprehension of the vibration phenomena that occur.
• The influence of different parameters can be studied thanks to the free choice of bearing and disk arrangement. The limitation of the amplitudes at a rapid resonant cycle can also be demonstrated.
• A three-phase motor drives a rotor shaft, onto which one or two masses may be fixed at various distances.
• The rotor shaft is mounted in two self-aligning ball bearings and connected to the motor via a flexible coupling.
• The electronically controlled speed can be selected via two potentiometers and is continuously variable. It is displayed on a digital display.
• The positions of and distances to elements fixed onto the rotor shaft can be read on a scale mounted in parallel with the rotor.
• A transparent protective cover and safety bearings immediately next to the masses ensure safe operation.
• The measured values can be displayed and analysed on a PC using the optional TM 620.20unit for data acquisition.

Technical Details:

Specification:

• investigation of bending vibrations and resonance in rotors
• 2 self-aligning ball bearings to support the rotor shaft, positionable at any point
• 2 masses to be secured at any point
• safety bearing and transparent protective cover for safe operation
• three-phase motor: 2 pre-selectable speed ranges; speed electronically controlled and continuously adjustable
• digital speed display
• system for data acquisition (TM 620.20) available as an option

Technical Data:

• Three-phase motor
  • power: 0,25kW
  • speed: 3000min^-1
• Rotor shaft
  • L=500mm
  • Ø 6mm
  • high tensile steel
• Mass 2x, disk-shaped
  • m=965g
  • Ø 80mm
  • hardened steel
• Rotor bearing
  • 2x self-aligning ball bearings
  • 2x safety bearings
  • safety bearing play: ±3mm
  • adjustable bearing clearance: 300…470mm
• Measuring ranges
• speed: 300…3000min^-1
• scale for measuring distance: 0…500mm
• 230V, 50Hz, 1 phase
• 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
• UL/CSA optional

Dimensions & Weight:

• L x W x H: 1150x390x375mm
• Weight: approx. 49kg

Learning Objections/Experiments:

• investigate bending vibrations and resonance of a rotating shaft
• determine critical speeds with different arrangements of the bearing and masses on the rotor shaft and compare with theory
• investigation of the rotor’s self-centering effect

Scope of Delivery:

• 1 experimental unit
• 1 set of instructional material

Features:

• investigation of bending vibrations in rotors
• determine critical speeds
• positions of rotor bearing and rotating mass can be adjusted

Accessories:

• Optional:
• –      TM 620.20 System for data acquisition
• –      WP 300.09 Laboratory trolley

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.