lab@motestainstruments.com | Civil and Mechanical Engineering Lab Equipments India China
lab@motestainstruments.com | Civil and Mechanical Engineering Lab Equipments India China
Code: MOT-MTE-0018
Balance of Reciprocating Masses.
Using the 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/Outputs: 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)
Technical Data:
Cylinder machine (number of cylinders: 4; piston mass: 36g; additional mass:
41g); Crank mechanism (crank radius: 15mm; piston stroke: 30mm; connecting rod length:
70mm; cylinder centre distance: 35mm); DC motor (speed range: 100...3000minâ€1, nominal
power output: 36W); Resonant speeds (±50minâ€1) Or Equivalent
