This paper studies the optimum design of piezo-driven compliant motion stage. The flexure hinge for designing motion amplification structures has been widely used on conventional piezo stages. The novel 'cross hinge' is more flexible than the flexure hinge, allowing for large motion amplification and less resistance to motion which is ideal for a compliant motion stage. As simulation results, the newly designed stage has superior performance over traditionally designed stages in terms of motion amplification, allowing for larger motion ranges.

This paper presents the design and simulation results of a piezo-driven motion stage that employs a novel cross hinge structure that is more efficient and flexible than previous designs. The newly designed motion stage enables close to nanometer-precision motion control with ranges up to 1.6mm. Simulation results show the effectiveness of the novel hinge structures and the performance of the proposed design.

Mathematical model of maneuvering motion for a single-screw single-rudder ship is established and several applications to the special situations of maneuvering are attempted. While, the mathematical model for twin-screw twin-rudder ship is not presented so much, because that type of ship is not popular. Lee et al. have examined the characteristics of such ship by captive model tests in 1988, in Japan. This paper proposes new mathematical models for propeller effective wake (1 -Ωp) and effective neutral rudder angle deltaR in the case of twin-screw twin-rudder ship. And some maneuvering motionse are calculated with proposed models and compared with exact simulations.