이신우 교수

A conducting polymer was used to replace the metal electrode of ionic-polymer metal composite (IPMC)to remedy the problems of the metal electrode, which were high cost, long fabrication time, and failure during the long-term actuation. Polyaniline (PANi) of high conductivity was attached on a bare or plasma-etched Nafion membrane to comprise all-organic polymer actuators. The actuation displacement of as high as 2.3 mm was measured under 3.0 V. As the displacement appeared rather low compared to

To remove the metal electrode and comprise all-organic ionic polymer actuators, tri-layer actuators with anion exchange membranes and conducting polymer electrode were purposely fabricated by the simple attaching method with or without an adhesive layer. Three grades of Neosepta were used as the anion exchange membrane,and polyaniline (PANi) as the electrode. Despite the oxidation/reduction occurring, PANi functioned as the electrode for the actuators. The bending displacement of 7 mm was measur

In the dynamics of rotors, the Campbell diagram is a very powerful tool for presenting the natural frequencies and finding critical speeds of rotating machinery. However, a conventional Campbell diagram can not explain exactly why there is no backward critical speed in isotropic systems but there is in anisotropic systems. This paper reviews the existing methodologies used to solve the eigenvalue problem and discusses the advantages and limitations that they have in describing the rotordynamics

A series of high-speed generators (HSGs) for a hybrid electric vehicle is being researched at Imperial College. One of the key features of these products is their compactness (about 10 per cent of the weight of a comparable diesel generator set), making them highly portable. A brief description of an HSG is given here. In order to operate these generators safely, it is very important to be able to predict and analyse their dynamic behaviour. For this purpose, a systematic procedure is proposed t