Features
Demonstration of fundamental aspects of mechanical vibration
Damping and resonance with forced vibrations
Two different principles of exciting vibration
Versatile bench-top experiment system on torsional stiffness and torsional vibration
Behavior of two and three masses torsional vibrators
Data Acquisition software for data acquisition

Tesca Torsional Vibration Apparatus is experimental unit used to explain torsion and torsional vibration in exeriments. Demonstrations and student experiments are both foreseen in equal measures. The core of the experiment is a metal torsion bar. With the aid of chucks, mass discs of varying inertia can be attached to the bar. It this way it is possible to assemble torsional vibrator systems with up to three masses. Vibrations can be induced on the system using an electrical exciter supplied from the control unit. An adjustable damper can be used to influence the vibrations. Shaft encoders on the chucks provide the amplitude of vibration as an  electrical  signal. The control unit conditions these signals and makes them available, e.g., for display on the software for data acquisition or on an oscilloscope (which must be provided).

Specifications
Experimental unit for investigating torsional vibration and torsional stiffness in demonstrations and student experiments
Frame made of aluminum with rubber feet
Steel torsion bar, corrosion-resistant 
3 mass discs
4 ball bearing mounted bearing units with chucks and 3 hole flange, the bearing units can be positioned as required
Sealed oil damper
Exciter with drive crank, excitation amplitudes 1.4°, 1.8°, 2.4°
4 angle of rotation sensors, 0.03V/°
Electrical exciter control unit with digital frequency display, 10-turn potentiometer and supply for the shaft encoders
Software for data acquisition via USB under Windows Vista or Windows 7

Technical Specifications
Torsion test bar
-  1300mm
D=6mm
Corrosion-resistant steel
Stiffness: approx. 1,0Nm/rad/m
Weights
D=150mm, approx. 2,7kg
D=228mm, approx. 4,8kg
Exciter frequency: 1...20Hz
Damping coefficient: 0,25...3,5 Nm/rad/s

Experiment Possibilities
Determination of the torsional stiffness of a torsion bar
Determination of the mass moment of inertia
Decay behavior of torsional vibration
Determination of the damping of torsional vibration
Forced torsional vibration, resonance
Torsional vibration systems with several weights, two mass torsional vibrator, three mass torsional vibrator

Scope of Delivery
1 frame
4 bearing units
1 torsion bar Ÿ 3 mass discs Ÿ 1 exciter
1 rotary damper
1 control unit
1 set of cables
1 hexagon screw driver, AF 4
1 Software CD + USB cable
1 manual