Simulation of a Micro Electro-Thermal Actuation System Using ADAMS
A micro electro-thermal actuation system called BETV (Bidirectional Electro-Thermal Vibrator) utilizes alternating electric input applied on the terminals as energy source to generate the oscillation of the impact head due to repetitive contraction and expansion of different cross-sectional areas of the electric path under Ohmic heating (see Fig. 1 below). The impact head then collides with the slider and the slider moves accordingly. The output displacement of the slider of the BETV is commonly used to control the inductive property of a micro magnetic circuit (see Fig. 2 below) or as a switch to turn on/off of an optical signal.
Fig. 1 Configuration of BETV Fig. 2 Use BETV to change inductive property
Read more...Dynamic Behavior of an Arch Structure Under Moving Point Loads
An arch structure under single moving point load had been previously studied (see Fig. 1). This project was intended to understand the dynamic response, especially the snap-through behavior over time, of such structure under two moving point loads toward each other (see dashed line in Fig. 1). Using Mathematica software package, it is possible to study the characteristics and determine the dangerous zone where snap-through would occur under certain combination of different load magnitudes and load speeds.
Fig. 1 Problem description of an arch under moving point load(s)
(courtesy of Solid Mechanics Laboratory, NTU)
YAMAHA YZF-R1 3D Modeling Using CATIA
Complex mechanical system design like motorcycles, automobiles and airplanes require collaboration of multiple engineers. CATIA provides an interface for concurrent design, and its flexibility of geometry construction is intuitive and easy to get starting with. Fig. 1~3 below are from a computer aided design course project accomplished by Lee, Y.H., Wang, W.R. and Chang, T.W. in 2007.
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Fig. 1 Computer graphic rendering of YAMAHA YZF-R1 with natural scene background
