Kiyotoshi Hiratsuka

Dynamic Response of Base Isolated Rotational Shell with Edge Beam and Fuzzy Vibration Control of the Shell

Seismic isolation and fuzzy vibration control systems, which consist of a shell with an edge beam which has springs and variable dampers between the edge beam and the ground, are suggested by one of the authors. In this paper, natural vibration modes and natural frequencies of base isolated rotational shells with edge beams are shown. When the shell shakes due to vertical seismic forces, the seismic isolated system is implemented. As a result, stresses in the shell are significantly reduced. Furthermore, vibration control of the shell is carried out. Then the damping ratios are adjusted by the fuzzy theory, and stresses in the shell are further reduced.

Analysis of Components of Waterfront Parks by Using Conjoint Analysis Including an Incomplete Answer

The present invention relates to a control device for a hoist mechanism of a crane, preferably for a crane with a jib which can be varied in length and be luffed, with a hydraulic motor driving the hoist mechanism drum which motor forms a closed hydraulic circuit together with a hydraulic pump driven by a motor, preferably by a diesel engine, and with a locking brake for the hoist mechanism drum. In accordance with the invention in the high-pressure line of the hydraulic circuit a pressure gauge is positioned the signals of which are fed to a comparator unit, a unit for determining the moment of the hoist mechanism drum is provided the signals of which are fed to the comparator unit and the comparator unit together with a processing unit of the control unit adapts the pressure in the high-pressure line to the moment which must be applied by the hydraulic motor and which corresponds to the moment of the hoist mechanism drum by means of a corresponding increase or decrease of the pumping capacity in such a manner that a smooth holding, lifting or lowering of the load is possible when the locking brake is released.