08 Sep 2010
FYDP project "Torsional Wave Demonstrator" at the Joint School Science Exhibition (JSSE), 27 - 31 August 2010
A Final Year Design Project named "Torsional Wave Demonstrator" was successfully showcased at the Joint School Science Exhibition (JSSE) on 27-31 August 2010.
The “Torsional Wave Demonstrator” was designed and developed by Kong Wing Yin, Tang Ki Kong, Tso Chi Yan and Yip Man Tung (2010 ME graduates) as their final year design project under the supervision of Prof QP Sun. The showcase has drawn enormous attention of visitors at JSSE, including secondary school teachers and students, staff from the Hong Kong Science Museum, as well as VIPs such as Ms Fanny Law.
To demonstrate the wave propagation phenomena, the torsional wave machine (a structure called "Torsional wave demonstrator”) is developed in order to make the propagation of torsional vibration visible. Thus the wave phenomena on the propagation of torsional vibration in the machine can be seen by naked eyes. The wave speed is decreased by increasing the moment of inertia of the inertial bars rather than by changing the shear modulus or the density of the material of the centre cylinder. In addition, this torsional wave machine can demonstrate a variety of wave forms, for instance reflection waves, standing waves, superposition and energy absorption (damping) phenomena, etc.