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TM 155

Free and Forced Vibration Apparatus

Technical Description

This experiment on vibration is of a table-top design. All experimental set-ups are rapidly and securely assembled on a double profile frame made of aluminium using slot nuts and clamping levers. The vibrator consists of a beam mounted in ball bearings at one end; a helical spring is hung on the other end of the beam. The attachment of springs, the exciter and a damper to a perforated panel permits a wide range of different set-ups to be reproduced. Either an unbalance exciter or a displacement exciter generate vibrations; the frequency of the vibrations can be adjusted using the electronic control unit. The displacement exciter can be fitted directly to the base of the spring. The vibrations can be damped using the adjustable viscosity damper. To record vibration processes over time, a mechanical drum plotter is included. The experiment also includes an amplitude contact with a TTL output, e.g. for triggering stroboscopes. The external computer-aided PC data acquisition (TM 150.20) and a practice set for torsional vibrations (TM 150.02) are available as accessories.

Learning Objectives / Experiments

- Natural vibration
- Damped vibration
- Inertia force and displacement excitation
- Forced vibration
- Resonance
- Amplitude and phase response

Features

* Demonstration of fundamental aspects of mechanical vibration₁
* Damping and resonance with forced vibrations₁
* Two different principles of exciting vibration

Available accessories

TM 150.01 -- Vibration Sensor with Clamping Set
TM 150.02 -- Free and Damped Torsional Vibrations
TM 150.20 -- PC-aided Data Recording System for TM 150 and TM 155
TM 151 -- Sensor Supply Module

Alternative products

TM 150 -- Universal Vibration System
TM 160 -- Vibration Apparatus

Specification

[1] Basics of mechanical vibration, natural damped and forced vibrations
[2] Bar-type oscillator
[3] Three helical springs
[4] Unbalance exciter with DC motor, 0.77kg
[5] Displacement exciter with DC motor, stroke 20mm
[6] Electronic control unit with digital display and 10 turn potentiometer, exciter frequency adjustable
[7] Oil-filled damper
[8] Electrically driven drum recorder
[9] Amplitude meter with electric contact for triggering equipment, measuring range 20mm
[10] Anti-slip, strong double frame made of aluminium profile, opening w x h 870x680mm
[11] 230V, 50Hz, 1 phase

Technical Data

Bar-type oscillator: l x w x h 700x25x12mm, 1.6kg
Helical springs:

- 0.75N/mm

- 1.5N/mm

- 3.0N/mm
Exciter frequency: 0...50Hz, electronically controlled
Unbalance of the unbalance exciter: 0...1000mmg
Stroke of the displacement exciter: 20mm
Damper constant: 5...15Ns/m, oil-filled
Mechanical chart recorder:

- feed: 20mm/s
- paper width: 100mm

Dimensions and Weight

l x w x h : 1000 x 400 x 900 mm
Frame opening w x h: 870 x 680 mm
Weight : approx. 65 kg

Connections

230V , 50Hz, 1 phase (exciter control unit)

Scope of Delivery

1 experiment frame

1 bar-type oscillator

3 helical springs

1 unbalance exciter

1 displacement exciter

1 exciter control unit

1 damper

1 amplitude meter

1 drum recorder

1 instruction manual

Order Details

040.15500 TM 155 Free and Forced Vibration
Apparatus