University of Twente Student Theses


Influence and implementation of static balance on a parallel leaf spring mechanism

Kleverwal, Koen (2023) Influence and implementation of static balance on a parallel leaf spring mechanism.

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Abstract:Flexure-based mechanisms have advantages over traditional mechanisms, as they do not suffer from backlash and friction, and have high precision and reliability. However, these mechanisms do have some drawbacks. The largest drawback is the strain energy storage in the flexible elements, which affects the input-output relationship, as a part of the inputted energy is used for the deformation of the elastic elements. To negate this effect, a system can be statically balanced. To do this, a compensating form of energy is introduced. This is often done by adding a pre-load in the mechanism. When in movement, energy can flow from the pre-load area to the deforming flexures. A system where the strain energy is compensated, in such a way that the potential energy is constant, is said to be statically balanced. The addition of pre-load, leads to static balance, but also has effect on other system properties. The pre-load could affect the support stiffness of the mechanisms. Hysteresis could be added or increased, by the addition of pre-load. In this research, the side effects of pre-load are examined, with a focus on support stiffness, hysteresis and stress. Simulations and measurements were done, to examine the effects of the pre-load. Both modal measurements and hysteresis tests were done. The measurements were done with both mass and springs. The springs were both clamped and hanging. This was done so that the difference between attachment methods could be examined.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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