... Saitama, Saitama, Sakura-ku, Shimo-Ohkubo, 255, Japan Department of Computer Controlled Mechanical systems, Graduate School of Engineering, Osaka University Osaka, Suita, Yamadaoka, 2-1 , Japan ... INVESTIGATION OF ITS RESONANT FREQUENCY D Yoshikawa1, S Aoyagi1 and Y C Tai2 'Systems Mangement Engineering, Kansai University 3-3 -3 5, Yamate-cho, Suita, Osaka 56 4-8 68 0, Japan California Institute ... 30 5-0 047, JAPAN Robomachine Laboratory, FANLJC Ltd., Oshino, Yamanashi 40 1-0 597, JAPAN Materials Fabrication Laboratory, The Institute of Physical and Chemical Research (RTKEN), 2-1 Hirosawa, Wako,...