University of Twente Student Theses


Modelling, design and fabrication of a 3D force sensitive stylus

Sikkens, Boudewijn N.A (2017) Modelling, design and fabrication of a 3D force sensitive stylus.

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Abstract:This work documents the design and analysis of a stylus based sensor capable of measuring three forces and two torques. The design of the new sensor as well as the theoretical framework used to analyse it are based on a concept using a differential capacitive readout. This model was deemed accurate enough to be used. The new sensor has a suspension consisting of a mass suspended in a frame by four beams, suspended in a larger frame by another 4 beams. The mass has a large round hole as a place to attach a stylus to the sensor. Two sensors with different beam lengths were tested with different parameters. Two sets of measurements were done with different types of loads applied for each set. The first set consists of testing the measurement modes under normal force loads ranging from 0 to 0.5N for the first sensor and up to 0.2N. The second set consists of applying a shear force on the stylus, which generates the additional torques. Both sensors together show that the sensor is capable of measuring all three forces and torques. Most of the measurement results show linear responses to the applied forces and torques.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:52 mechanical engineering, 53 electrotechnology
Programme:Electrical Engineering MSc (60353)
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