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Products | Theory of Machines and Properties of Materials | Dynamics | TM 180

TM 180

Balance of Reciprocating Masses

Technical Description

Using the table model, mass forces can be investigated on a reciprocating piston machine. The model has four pistons with plastic sleeves that do not require lubrication. The quadruple cranked crankshaft is driven by an electronically commutated DC motor via a toothed belt. The rotational speed is regulated and displayed digitally. Forces and moments are measured using strain gauges on the elastic boom of the model mounting bracket. All electrical functions are integrated into the control unit that also provides an analogue output for an oscilloscope. The crank offset for each cylinder can be continuously adjusted, as an aid marks are provided at 90°, 180° and 270°. The natural frequencies are defined such that resonant oscillations are easy to detect even without instrumentation.

Learning Objectives / Experiments

· Run up curve
- Effect of mass forces
· Comparison of different crank arrangements
- Four cylinder, symmetrical, 180° crank offset
- Four cylinder, unsymmetrical, 90° crank offset
- Two cylinder, 180° crank offset
- Single cylinder

Features

Investigation of oscillating and rotating mass forces on a reciprocating piston machine
Continuous adjustment of the crank offset is possible
Simulation of 4, 2 and 1 cylinder machines can be performed

Alternative products

PT 500.16 -- Crank Mechanism Kit
TM 170 -- Static and Dynamic Balancing Apparatus

Specification

[1] Table model for investigating oscillating and rotating mass forces and moments on a reciprocating piston machine with four cylinders
[2] Simulation of 4, 2 and 1 cylinder machines
[3] Speed range : 100...3000rpm
[4] Electronically commutated and speed regulated DC motor with digital display and 10-turn potentiometer
[5] Crank radius : 15mm, connect. rod length: 70mm
[6] Continuous adjustment of the crank offset
[7] Force and moment measurement using strain gauges, measuring amplifier with digital displays
[8] Vibration decoupling from the laboratory environment using rubber components and matching
[9] lxwxh 420 x 370 x 320mm

Technical Data

Speed range : 100 ... 3000rpm
Number of cylinders : 4
Piston mass : 36g
Additional mass : 41g
Cylinder centreline spacing : 35mm
Crank radius : 15mm
Connecting rod length : 70mm
Resonant speeds (±50rpm)
for 1st order forces : 1820rpm
for 2nd order forces : 900rpm
for 1st order moments : 2550rpm
for 2nd order moments : 1280rpm

Dimensions and Weight

Model: l x w x h 420 x 370 x 320 mm, 40kg
Control unit : l x w x h 370 x 320 x 160mm, 5kg

Connections

230V , ~50Hz

Scope of Delivery

1 4-cylinder model,
1 control unit,
1 instruction manual

Order Details

040.18000 TM 180 Balance of Reciprocating Masses