investigation of torsional stiffness and torsional vibrations

Description:

• Torsional vibrations are often observed in belt-driven systems.
• With appropriate excitation of resonances, large vibration amplitudes can occur, which can lead to strong loads on shafts and gears, potentially resulting in damage.
• The TM 140unit can be used to produce free and forced torsional vibrations and to study the effects of torsional stiffness, mass and damping on frequency and amplitude.
• The core of the experimental unit is a metal torsion bar.
• Mass disks with different rotational inertias can be attached to the bar using clamping chucks.
• This allows a torsional vibration system to be created with up to three masses.
• The torsional stiffness can be adjusted by varying the effective bar length.
• An exciter unit driven by an electric motor is used to represent forced vibrations.
• The frequency can be adjusted and read on the control unit.
• A damper makes it possible to set different degrees of damping.
• The torsional vibrations are picked up via rotary encoders on the bearings of the torsion bar and are available on the control unit as an electrical signal.
• All signals are also available via a USBport and can be transferred to a PC.
• The GUNTsoftware allows the signals to be recorded and analysed, for example recording a resonance curve or displaying the natural mode.

Technical Details:

Specification:

• experimental unit for investigating torsional vibrations and torsional stiffness
• 3 mass disks
• 4 freely position able ball-bearing-mounted bearing units with clamping chucks
• sealed oil damper
• exciter unit with drive crank; exciter amplitudes 1,4°, 1,8°, 2,4°
• 4 rotary angle sensors, 0,03V/°
• electrical exciter control unit for setting and displaying the exciter frequency and for powering the rotary encoder
• GUNT software for data acquisition via USB under Windows 8.1, 10

Technical Data:

• Torsion bar:
  • 1300mm
  • Ø 6mm
  • stainless steel
• Rigidity: approx. 1,0Nm/rad/m
• Mass disks
  • Ø 150mm, approx. 2,7kg
  • Ø 228mm, approx. 4,8kg
• Exciter frequency: 1…20Hz
• Damper coefficient: 0,25…3,5Nm/rad/s
• 230V, 50Hz, 1 phase
• 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
• UL/CSA optional

Dimensions & Weight:

• L x W x H: 1400x410x400mm
• Weight: approx. 50kg

Required for Operation:

• PC with Windows recommended.

Learning Objections/Experiments:

• determine the torsional stiffness of a torsion bar
• determine the mass moments of inertia
• decay behaviour of torsional vibrations
• determine the damping in torsional vibrations
• forced torsional vibrations, resonance
• torsional vibration systems with multiple masses:
• two-mass torsional oscillator
• three-mass torsional oscillator

Scope of Delivery:

• 1 frame
• 4 bearing units
• 1 torsion bar
• 3 mass disks
• 1 exciter
• 1 rotational damper
• 1 display and control unit
• 1 set of cables
• 1 hexagon screwdriver size 4
• 1 GUNTsoftware + USB cable
• 1 set of instructional material

Features:

• behaviour of two-mass and three-mass torsional oscillators

Accessories:

• 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.