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You are here: Home / Mechanical Engineering / Mechanics and Technology / Kinematics and Dynamics / DYNAMICS OF A ROTATING SYSTEM EX170 – EX180 – EX185


This range of equipment allows study of the balance of a system rotating around an axle.

EX170 180 185

Vibration and out-of-balance forces can be visualised and measured by computer-assisted data acquisition. Static and dynamic balancing is possible for complex rotating shapes. Specially written simulation software is used to compare the theoretical and the actual performance.


Teaching objectives

The EX170, EX180 and EX185 range of equipment allows :
- Visualisation of vibration and out-of-balance forces
- Static and dynamic balancing of the assembly without added mass or loaded with one or several masses
- Dynamic balancing of the assembly loaded with one or several masses and rebalanced using one or more masses, either with or without data acquisition
- Quantitative study of the various modes of vibration and out-of-balance behaviours
- Measurement of the forces and displacements on the rotor supports
- Static and dynamic balance of the rotor unbalanced with complex rotating shapes
The simulation software, VIBROTOR EX176, is supplied as standard to illustrate the performance of the rotating system and to select the necessary balance masses.


Technical specifications

The EX170 basic unit consists of a shaft rotating through two bearing blocks and equipped with four discs symmetrically on both sides of the supporting blocks. The system is connected elastically to the base plate via two pairs of flat spring steel beams. Small masses of various values can be attached to each disc to balance or unbalance the rotating system. Rotational movement is given to the system manually.
The test bench EX180 is identical to the EX170, but two of the flexible steel beams supporting the rotating assembly, are fitted with strain gauges. A magnetic proximity detector fitted adjacent to the rotating shaft permits measurement of instantaneous angular position and speed of rotation. These sensors allow computer-based data acquisition.
The EX185 apparatus permits all the experimentation of the EX180 and EX170, but additionally allows the study of the balance of any rotating shape. The two discs closest to the support beams are equipped with rims, allowing the attachment of self-adhesive masses. Furthermore, one of the outer discs can be replaced by a spindle onto which any disc or shape may be attached.
Whichever system is used, it is essential that they are fixed securely to a robust support to maximise the accuracy of the test results.

We offer three versions according to your teaching needs :
EX170 - Basic equipment for the study of rotational systems:
- test bench without instrumentation
- set of masses and pull-chord
- simulation software EX176
- technical manual and teaching notes

EX180 - Includes the complete EX170 set, but additionally with :
- set of instrumentation (rotational sensor and strain gauges)
- data acquisition software, interface card, connecting box and cables
- technical manual and teaching notes

EX185 - Includes the complete EX180 set, but additionally with :
- two rims and spindle with standard disc
- three complex shapes (disc with missing segment, disc with axial holes, disc of tapered section)
- technical manual and teaching notes


Dimensions and weight

- EX185 : 60 x 26 x 45 cm - 14 kg


Essential requirements

- Strain bridge Ref EI616 for use with EX180 and EX185 only
- Electrical supply : 220 V – 50 Hz (for the strain bridge)
- PC
- Solid support for the test bench