National Institute of Maritime, Port and Aviation Technology

Agc Inc.

Shunji Inoue

Kazutaka Ono

Jun Akiyama

Yasumasa Kato

Hirofumi Tokunaga

Tetsushi Takiguchi

Taketoshi Taniguchi

The present invention provides a floating offshore wind turbine capable of suppressing yawing of a nacelle caused by a gyro effect which is a cause of adverse influence of power generating efficiency of a wind turbine and endurance of devices thereof. The floating offshore wind turbineincludes a rotorwhich is rotated by wind, a nacellein which a rotation shaftof the rotoris accommodated, and a towerincluding a turning seated bearingwhich supports the nacellesuch that the nacellecan turn with respect to a sea surface P to exert a weathercock effect. The tower is provided with yawing suppressing meanswhich suppresses yawing T of the nacelle. According to this, it is possible to suppress the yawing T of the nacellegenerated by a gyro effect caused by yawing &#x3a9; generated in the floating bodyby waves of the sea surface P.

Floating offshore wind turbine

The present invention relates to an alkali-free glass substrate, in which when two arbitrary sites in one main surface thereof are selected, an absolute value of a difference between a thermal shrinkage ratio in an arbitrary direction at one site and a thermal shrinkage ratio in a direction orthogonal to the arbitrary direction at another site is 2 ppm or less, provided that the thermal shrinkage ratio is calculated by measuring a deformation amount in a measuring direction of the glass substrate between before and after a heat treatment of raising a temperature from normal temperature to 600&#xb0; C. at 100&#xb0; C./hour, holding the glass substrate at 600&#xb0; C. for 80 minutes, and lowering the temperature from 600&#xb0; C. to normal temperature at 100&#xb0; C./hour.

Alkali-free glass substrate and method for manufacturing alkali-free glass substrate

The present invention provides a floating offshore wind turbine capable of suppressing yawing of a nacelle caused by a gyro effect which is a cause of adverse influence of power generating efficiency of a wind turbine and endurance of devices thereof. The floating offshore wind turbine includes a rotor which is rotated by wind, a nacelle in which a rotation shaft of the rotor is accommodated, and a tower including a turning seated bearing which supports the nacelle such that the nacelle can turn with respect to a sea surface to exert a weathercock effect. The tower is provided with yawing suppressing means which suppresses yawing of the nacelle. According to this, it is possible to suppress the yawing of the nacelle generated by a gyro effect caused by yawing generated in the floating body by waves of the sea surface.

Growing community of inventors

Tokyo, Japan

Shunji Inoue