Model of a double oscillator

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  • Model of a double oscillator
Project at the HS in Konstanz
Model of a double oscillator
Oscillatory phenomena are seen in both the natural world as well as in technical applications. Oscillations are usually understood as temporal fluctuations of state variables. In technology, this can be both positive and negative. For example, oscillations are used on a vibratory bowl feeder to transport material. Technical problems can mostly be reduced and evaluated on a double oscillator. For example, the so called “quarter car model” is used to assess the vertical dynamics of a vehicle. However, abstractness and a lack of visualisation of such systems cause difficulties in understanding the behaviour of such models.
In order to tackle this problem, a real model of a double oscillator with sinusoidal base excitation was produced as part of a project in the Mechatronics Master's program at the Konstanz University of Applied Sciences. In addition, the model was described and analysed using traditional mathematical methods. Furthermore, the system was evaluated with simulations. The aim was to achieve the same results with all three methods and to therefore align the theory with practice. The model will now support lectures by adding an additional visual element and will therefore contribute to a better understanding.

Function:

A speed-regulated direct current motor drives the system using an eccentric drive. Its speed can be set with a potentiometer. As a result, the two oscillating units, which are mounted on the guide shaft, start to move. Differing oscillation states, such as resonance frequencies and damping, arise depending on the speed, mass of the oscillating units and spring constant.

Technical data

• Excitation frequency: 0...5 Hz

• Excitation amplitude: 15…25 mm

• Moving masses: 2x 200g to 800g in 150g steps

• Springs: interchangeable with various stiffnesses

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