Kabushiki Kaisha Toshiba

Fumio Ootomo

Hisashi Matsuda

Asako Inomata

Hiroyuki Kawagishi

Yoshiki Niizeki

Hiroshi Kawakami

Yoshitaka Fukuyama

Naoki Shibukawa

Tsutomu Ooishi

This invention provides an optimum value search apparatus, method, recording medium, and computer program product used in designing, analyzing, or testing a device having a plurality of factors that have effects on a characteristic. In this method, an orthogonal array is generated by setting level values obtained from the initial values of the factors to the coordinates of a two-dimensional table including a matrix of the characteristics and the factors. From the characteristics on the orthogonal array, characteristic values obtained on the basis of combinations of the level values of the factors of a single characteristic are grasped. A combination having a most excellent characteristic value is selected. The level values of the factors in the characteristic corresponding to the selected combination are reset in the orthogonal array. After resetting, processes are repeatedly executed to search for an optimum value as a most excellent one of the characteristic values.

Optimum value search apparatus and method, recording medium, and computer program product

A row of moving blades for a steam turbine has moving blades elongated radially which are arranged peripherally around and secured to a turbine rotor. The row also has an intermediate support structure for holding the blades to each other at a radially intermediate position. The support structure has a shape of a streamline cross section. The support structure may include a tie wire secured to the blades, or lugs protruding from the blades and combined to each other. The support structure may include lugs protruding from the blades to each other, and a sleeve combining the lugs. The shape of a streamline cross section may have an obtuse-angle or acute-angle upstream part.

Steam turbine, and intermediate support structure for holding row of long moving blades therein

A steam valve in accordance with the present invention is the steam valve that houses a first valve devicecomposed of a valve seat, a valve body, a valve rod, and a driving device, and a second valve devicecomposed of the valve seat, the valve body, the valve rod, and the driving device, combined with each other in the valve casing, and a closing portionto block a part of a main steam flow flowing from outside to inside of a strainer is formed in the strainerthat is housed in the valve casingand that surrounds the valve bodyof the first valve device. According to the above described configuration, the steam valve that is aimed to further decrease a pressure loss can be provided by effectively controlling the steam flow in the strainer housed in the valve casing.

Steam valve

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Zama, Japan

Fumio Ootomo