Hitachi-ge Nuclear Energy, Ltd.

Hitachi, Ltd.

Yosuke Takatori

Satoshi Okada

Ryosuke Kobayashi

Masahiro Tooma

Hiroshi Yamamoto

Naoyuki Kono

Akira Nishimizu

Yoshio Nonaka

Katsuhiko Hirano

Mitsuru Odakura

Hayato Mori

Kojirou Kodaira

Hirofumi Ouchi

Yutaka Kometani

Akihiro Taki

Makoto Senoo

A system for attitude control of an underwater vehicleof the present invention includes an underwater vehiclewith a thruster, an assist devicethat is coupled to the underwater vehiclewith a cableand has cable handling equipmentand a thruster, a cable attachment-to-attachment distance detection unitthat detects distance between a cable attachment of the underwater vehicleand a cable dispenser of the assist device, and a control unitthat previously stores the relationship between the attachment-to-attachment distance and cable length including a predetermined amount of slack and determines the amount of cable to be wound up or let out based on the cable length associated with the detected attachment-to-attachment distance.

System for attitude control of underwater vehicle and method for attitude control of underwater vehicle

The position detection system includes a pressure sensor that detects the vertical position of an underwater vehicle, a range sensor unit that detects the relative distances of the underwater vehicle from its surrounding structures; a measurement image acquisition unit that acquires a measurement image of the horizontal plane, an image storage unit that stores images, an image selector that selects one of the stored images that corresponds to the horizontal plane in which the relative distances have been detected, a corresponding-area identification unit that identifies the area in the selected image that corresponds to the measurement image by performing map matching, and a horizontal position calculator that identifies, the pixel that corresponds to the position at which the relative distances have been detected and calculates the horizontal position of the underwater vehicle.

System and method for detecting position of underwater vehicle

A position detection system for an underwater inspection unit or vehicle improves the detection accuracy of the unit's position. The unit includes a pressure sensor for detecting its vertical position, and an inertial sensor for detecting its attitude angle. The unit also includes a range sensor unit for detecting relative distances relative to a neighboring structure A in several directions on substantially the same plane. A control unit computes a position of a detection direction plane of the range sensor unit based on the unit's detected vertical position and attitude angle, and a cross-sectional shape and position of the structure at the computed position of the detection direction plane. Additionally, the control unit computes the unit's relative position with respect to the structure's cross-sectional shape based on detection results by the range sensor unit, and computes the unit's horizontal position based on position information of the structure's cross-sectional shape.

System for detecting position of underwater vehicle

Disclosed is an eddy current flaw detection probe that is capable of pressing itself against an inspection target whose curvature varies. A flaw sensor is configured by fastening a plurality of coils to a flexible substrate that faces the surface of the inspection target. A first elastic body is positioned opposite the inspection target for the flaw sensor, is obtained by stacking two or more elastic plates, and has an elastic coefficient that varies in a longitudinal direction. A second elastic body is a porous body positioned between the flexible substrate and the first elastic body. A pressure section is employed to press the first elastic body toward the inspection target.

Eddy current flaw detection probe

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Hitachi, Japan

Yosuke Takatori