Japan Hamworthy & Co., Ltd.

Hitachi Shipbuilding and Engineering Co., Ltd.

Hirotaka Yamamoto

Yukio Tomita

Takayuki Wakabayashi

Noriyuki Oda

Kenjiro Nabeshima

Kazushi Tomita

In collision-avoidance maneuvering in congested waters, an own ship is decelerated by astern power. The own ship is continuously navigated on a current target course with a propulsion propeller always rotated forward at the stern of the own ship. The astern power is generated as the propulsion of a propeller slipstream with rudder angles formed at a pair of right and left high-lift rudders disposed behind the propulsion propeller. In the decelerating maneuvering, the rudder angles formed at the high-lift rudders are controlled within a range from a rudder angle for applying a maximum propeller slipstream as the astern power to a rudder angle for eliminating the ahead power of the propeller slipstream, and the deceleration of the own ship is controlled by changing the astern power according to the rudder angles.

Collision-avoidance maneuvering method in congested water and collision-avoidance maneuvering system for single-propeller twin-rudder ship

The inner cylindrical body is mounted on the top surface of the rudder-stock; the outer cylindrical body is put on the inner cylindrical body exteriorly; the gudgeon pin provided on the top reverse surface of the outer cylindrical body is inserted into the gudgeon provided on the top surface of the inner cylindrical body; the pin protruded on the top surface of the outer cylindrical body is inserted into the chest fixated to the supports; the rotational movement checking device, that obstructs the pin to rotate, and at the same time, permits it to be displaced in the radial direction, is provided inside the chest; the scale is provided on the outer circumferential surface of the inner cylindrical body; and, the rudder angle detecting optical sensors facing the scale are mounted on the inner circumferential surface of the outer cylindrical body.

Rudder angle detecting device of steering gear

A system for recovering as power the pressure and sensible heat of the gas discharged from the top of a blast furnace by guiding the gas to a dry-type dust collector for the removal of dust while maintaining the gas at the furnace top pressure and introducing the gas into a turbine for expansion. To protect the dry-type dust collector when the gas is run off from the furnace at an abnormally high temperature, a gas channel extending from the furnace to the dust collector is provided with at least one injector, which injects a cooling fluid into the gas in response to a signal from a temperature detecting sensor disposed close to the gas outlet of the dust collector. The sensor which is positioned near the dust collector outlet detects the temperature without the time delay attributable to the deposition of dust. With use of the dry-type dust collector, the gas can be fed to the turbine almost without cooling for the recovery of an increased amount of power.

Growing community of inventors

Osaka, Japan

Hirotaka Yamamoto