Design and Research of a Miniature Pneumatic Vibrator
Most conventional high-frequency vibrators used in ultrasonic applications like machining or welding processes generate the working power based on principles of piezoelectric or magneto-strictive effects (see Fig. 1 & Fig. 2). After entering the transducer, the time-varying electric input energy will then be transformed into solid-body vibration; however, the heat dissipated during energy transduction and the high-frequency electric input source has made them more complex of such transducers. Hence, in this work the use of pneumatic excitation was proposed as an alternative, which aimed to utilize the self-cooling property of gas and the availability of such phenomenon under constant air pressure.
Fig. 1 Common Langevin type piezoelectric transducers (courtesy of Tamura Corp.)
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The idea of this work was intended to build a whiskey ice feeding machine which stores and feeds ice balls (see Fig. 1). The marketing research of such machines was done and shown with great potential by the marketing management students of National Chung Cheng University. Collaborating with mechanical engineering students of National Taiwan University, the prototype was built and proved applicable. With the compelling demonstration and thorough marketing analysis, the group won the 1st prize of TiC100 Campus Entrepreneurship Competition in the final.
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Design and Realization of a Whiskey Ice Feeding Machine
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| Fig. 1 Whiskey ice ball |
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Design and Realization of a Long-Stroke Displacement Sensor Using Hall Elements
Design and Realization of a Long-Stroke Displacement Sensor Using Hall Elements
In this work magnetically sensitive electronic components called Hall elements were used to realize a long-stroke displacement sensor (see Fig. 1). Output voltage of Hall elements are induced by magnetic fields, and hence are sensitive to the proximity of ferromagnetic objects like magnets. By creating flux change in the magnetic circuit (see Fig. 2), induced voltage can be read out and used to calculate the actuated displacement.
Fig. 1 Illustration of a displacement sensor Fig. 2 Possible magnetic flux change design
Read more...Parametric Study of a Typical Rocker Switch
Rocker switches are common electro-mechanical components used to close or open electrical connections. Solteam Electronics Corporatoin, a famous electronics manufacturer in Taiwan, sought cooperation with mechanical engineering students at National Taiwan University in order to get more insights of the design parameters of a typical rocker switch MR22 (see Fig. 1). This project mainly focused on two subjects, the first was the effects of geometric parameters on mechanical performance indices like maximum force required and stroke length, the second one was the validation of a simplified mathematical model predicting electrical contact resistance and the equilibrium temperature.
Fig. 1 Partially sectioned model of rocker switch MR22
