Metrology Laboratory

The MTL consists of practical tutorials that take place on mondays from 01:15 - 03:30 pm and tuesdays from 10:15 am - 12:30 pm (IGMR specific). The exact dates of the exercises can be found under Dates/ Times and the exercises of the Department of Mechanism Theory and Dynamics of Machines (IGMR) here.

Every student needs 10 attestations of the laboratory exercises.

Approximately 6 weeks before the start of the semester the registration portal will be activated. Here the student is assigned to a group with 11 possible exercises. The exercises take place twice per week at most. Any change in the exercise order is generally not possible.


The student will be able to print the personal attestation form after the registration. The attestation form must be brought to all labs!

Please take a look at the group dates before registering!

Test 7.1 Vibration Test

Subject of the experiment

One-mass-oscillator of a flexible mounted machine. Determination of characteristic quantities and properties of free and forced damped vibration.

Theoretical Background

Laws of free and forced vibrations of damped oscillators with one degree of freedom. Equation of motion: linear ordinary differential equations of second order with constant coefficients. Representation of your solution and the relation to the characteristic quantities.

The aim of the experiment

Numerical and graphical evaluation of test results to determine characteristic quantities of the vibration. Demonstration of the oscillator behavior as a function of these quantities.

Part tests

Free damped vibration

Measuring and recording the vibration displacement of a free damped one-mass-oscillator as a function of time(decay curve). Determining the eigenfrequency and the descriptive quantities of the damping.

Forced damped vibrations

Measurements of displacement and excitation speed of a damped one-mass-oscillator with centrifugal force excitation. Recording the displacement amplitude and the phase angle as a function of its excitation frequency (amplitude and phase frequency response).

Test 7.2 Balancing

Subject of the experiment

Balancing of an unbalanced rotor. Comparison of static shut-down motion and dynamic balancing with a distance measuring balancing machine.

Theoretical background

Effects of uneven mass distribution of high-speed rotors. Behaviour at under- and supercritical speed: force-/distance measuring balancing machines. Vibration measurements using electro-dynamic velocity sensors.

The aim of the experiment

Balancing of a unbalanced rotor with the help of a distance measuring balancing machine.

Part tests

Static oscillation of unbalanced rotors, dynamic balancing with distance measuring balancing machines: making adjustments to the machine(calibration run), complete balancing by adding additional weight.


Institute of Mechanism Theory, Machine Dynamics and Robotics

RWTH Aachen University

Eilfschornsteinstraße 18

52062 Aachen



Phone: +49 241 80 95546

Fax:      +49 241 80 92263


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