Patents by Inventor Mitsuyoshi Okazaki
Mitsuyoshi Okazaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7283929Abstract: An operation-supporting apparatus includes: an operation request input unit that inputs information relating to operation request items of plant equipment; an operating conditions setting unit that converts operation request input information to operating parameters; an operation history creation unit that creates an operation history by chronologically processing the operating parameters; a breakdown statistics database that stores an event tree of the plant equipment; an event simulator that calculates the degree of unreliability corresponding to the operating parameters, the operation request information, and the operation history information, and in compliance with the event tree; a risk-cost calculation unit that calculates risk-cost by determining the aggregate product of the degrees of unreliability and restoration costs; an operating method determination unit that determines whether operating conditions are suitable by comparing the risk-cost with profit gained by continuing operation; and an operatinType: GrantFiled: September 26, 2005Date of Patent: October 16, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Kazunari Fujiyama, Toshihiro Fujiwara, Kazuhiro Saito, Taiji Hirasawa, Satoshi Nagai, Hitoshi Kichise, Mitsuyoshi Okazaki, Hirotsugu Kodama, Masanori Minowa, Takayuki Iwahashi, Yasunari Akikuni, Masao Arimura, Kentaro Takagi, Seiichi Asatsu, Shigeru Harada
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Patent number: 7212952Abstract: Cause of abnormalities of an abnormal state of a control system of a plant of a turbine are estimated and diagnosed from characteristics of abnormal phenomena. By using a control system abnormality cause-and-effect matrix in which characteristics of a plurality of abnormal phenomena constructed on a knowledge base are correlated with a plurality of causes by correlating (weighting) scores, plant devices causing abnormality are inferred and diagnosed.Type: GrantFiled: March 25, 2005Date of Patent: May 1, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Shunzo Watanabe, Hideo Hosaka, Mitsuyoshi Okazaki, Seiichi Asatsu, Tatsuo Yamashita
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Publication number: 20060100915Abstract: It is an object of this invention to provide an apparatus that selects and specifies an optimal operating method for plant equipment while estimating risk-cost that relates to damage, performance deterioration, and functional stoppage, of the plant equipment, and comparing the risk-cost with profit gained from operation.Type: ApplicationFiled: August 29, 2003Publication date: May 11, 2006Inventors: Kazunari Fujiyama, Toshihiro Fujiwara, Kazuhiro Saito, Taiji Hirasawa, Satoshi Nagai, Hitoshi Kichise, Mitsuyoshi Okazaki, Hirotsugu Kodama, Masanori Minowa, Takayuki Iwahashi, Yasunari Akikuni, Masao Arimura, Kentaro Takagi, Seiichi Asatsu, Shigeru Harada
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Publication number: 20060095231Abstract: A plant diagnosis support system includes at least one of facilities provided on a plant company side, at least one of operation data collecting devices collecting, processing, and storing operation data of the plant facility, and a plant supervision server configured to receive the operation data stored in the operation data collecting device through a locally closed communication network and to transmit/receive data to/from a diagnosis support service computer to remotely support diagnosis of the plant facility, connected through an external communication line, wherein the plant supervision server has a graph display function of performing display in the same display format as in the operation data collecting device.Type: ApplicationFiled: October 24, 2005Publication date: May 4, 2006Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Mitsuyoshi Okazaki, Kazumichi Suzuki, Mitsuru Kubota, Shunzo Watanabe
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Patent number: 6965834Abstract: The present invention provides a method of inspecting a target component part (e.g., valve casing) of an apparatus (e.g., steam control valve) included in a steam turbine system. When a time period in a range of 24 to 100 hours passes from the shutting-down of the turbine system, or before a temperature of an atmosphere surrounding the component part is lowered to 100° C., the width of the opening of the crack formed in the component part or a clearance relating to the component part is measured without disassembling the target component part and an enclosing member (e.g., valve casing) from the apparatus. As the measurement is performed when a thermal stress is induced in the component parts or when the temperature distribution is wide, the risk level of the crack or the clearance is determined accurately.Type: GrantFiled: October 9, 2003Date of Patent: November 15, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Kazuhiro Saito, Kazunari Fujiyama, Taiji Hirasawa, Satoshi Nagai, Toshihiro Fujiwara, Hitoshi Kichise, Hirotsugu Kodama, Mitsuyoshi Okazaki
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Publication number: 20050203696Abstract: Causes of abnormalities of an abnormal state of a control system of a plant of a turbine or the like are estimated and diagnosed from characteristics of abnormal phenomena. By using a control system abnormality cause-and-effect matrix in which characteristics of a plurality of abnormal phenomena constructed on a knowledge base are correlated with a plurality of causes by correlating (weighting) scores, plant devices causing abnormality are inferred and diagnosed.Type: ApplicationFiled: March 25, 2005Publication date: September 15, 2005Inventors: Shunzo Watanabe, Hideo Hosaka, Mitsuyoshi Okazaki, Seiichi Asatsu, Tatsuo Yamashita
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Patent number: 6928391Abstract: Data on inspection, diagnosis, repair and operation histories are entered in a plant-maintenance apparatus for equipment that constitute a plant to be maintained. Failure-event tree breakdown is performed on failures to be expected for the equipment. Unreliability is predicted of at least one starting item in the failure-event tree breakdown. Unreliability of each item in the failure-event tree is calculated based on a failure unreliability function. Unreliability and a cost of recovery from each failure event in the failure-event tree are multiplied and results of the multiplication are accumulated in accordance with the tree breakdown to obtain a recovery cost. Preventive maintenance expenses are calculated for preventing failure events. Maintenance timing and technique are decided through comparison between the recovery cost and the preventive maintenance expenses.Type: GrantFiled: April 9, 2003Date of Patent: August 9, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Kazunari Fujiyama, Toshihiro Fujiwara, Kazuhiro Saito, Taiji Hirawawa, Satoshi Nagai, Hitoshi Kichise, Mitsuyoshi Okazaki, Hirotsugu Kodama, Seiichi Asatsu, Masanori Minowa, Takayuki Iwahashi, Shigeru Harada, Mamoru Sudo, Fumiharu Ishii
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Patent number: 6925418Abstract: An apparatus for maintaining plant equipment incorporates an input unit to receive information on targets and ranges of plant equipment to be maintained and a failure-event tree breakdown unit to perform tree-breakdown on failures to be expected from events to be inspected. A failure-unreliability function calculation unit calculates unreliability of each item in failure-event tree breakdown and a failure-derived monetary loss calculation unit multiplies each unreliability and a cost of recovery from each event in accordance with the failure-event tree breakdown. A preventive maintenance expense calculation unit calculates preventive maintenance expenses for preventing failure events and a maintenance decision-making unit decides maintenance timing and technique through comparison between the recovery cost and the preventive maintenance expense.Type: GrantFiled: April 9, 2003Date of Patent: August 2, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Kazunari Fujiyama, Toshihiro Fujiwara, Kazuhiro Saito, Taiji Hirawawa, Satoshi Nagai, Hitoshi Kichise, Mitsuyoshi Okazaki, Hirotsugu Kodama, Seiichi Asatsu, Masanori Minowa, Takayuki Iwahashi, Shigeru Harada, Mamoru Sudo, Fumiharu Ishii
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Patent number: 6922657Abstract: A vibration diagnosis is performed by using a vibration mode interactive query section grasping vibration event of a machinery such as turbine rotor and characteristic feature thereof from detected data information, a vibration factor diagnosis section estimating a vibration factor based on the information from the vibration mode interactive query section, and a diagnosis result display section indicating the estimated vibration factor and a guidance for countermeasure to be taken against the vibration factor.Type: GrantFiled: April 24, 2003Date of Patent: July 26, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Seiichi Asatsu, Masanori Murakami, Mitsuyoshi Okazaki
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Patent number: 6909990Abstract: A plant diagnosis system friendly to a user (a plant-operating organization) for identifying an abnormality of an objective plant or machinery thereof, is provided. The plant diagnosis system includes a diagnoser's sub-system including a diagnosis computer and a terminal for a diagnosis expert and is connected via a network to a user's sub-system including a terminal for communicating with the diagnoser's sub-system. The plant diagnosis system provides a simple but repetitively available primary diagnosis and a detailed secondary diagnosis including the expert's judgement, which are selectively available on the user's initiative. The diagnosis computer receives a diagnosis request and plant state variables of the plant or machinery and executes the primary diagnosis and a part of the secondary diagnosis based on the plant state valuables.Type: GrantFiled: February 12, 2003Date of Patent: June 21, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Mitsuyoshi Okazaki, Seiichi Asatsu, Shunzo Watanabe
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Publication number: 20040128109Abstract: The present invention provides a method of inspecting a target component part (e.g., valve casing) of an apparatus (e.g., steam control valve) included in a steam turbine system. When a time period in a range of 24 to 100 hours passes from the shutting-down of the turbine system, or before a temperature of an atmosphere surrounding the component part is lowered to 100° C., the width of the opening of the crack formed in the component part or a clearance relating to the component part is measured without disassembling the target component part and an enclosing member (e.g., valve casing) from the apparatus. As the measurement is performed when a thermal stress is induced in the component parts or when the temperature distribution is wide, the risk level of the crack or the clearance is determined accurately.Type: ApplicationFiled: October 9, 2003Publication date: July 1, 2004Inventors: Kazuhiro Saito, Kazunari Fujiyama, Taiji Hirasawa, Satoshi Nagai, Toshihiro Fujiwara, Hitoshi Kichise, Hirotsugu Kodama, Mitsuyoshi Okazaki
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Publication number: 20030204333Abstract: A vibration diagnosis is performed by using a vibration mode interactive query section grasping vibration event of a machinery such as turbine rotor and characteristic feature thereof from detected data information, a vibration factor diagnosis section estimating a vibration factor based on the information from the vibration mode interactive query section, and a diagnosis result display section indicating the estimated vibration factor and a guidance for countermeasure to be taken against the vibration factor.Type: ApplicationFiled: April 24, 2003Publication date: October 30, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Seiichi Asatsu, Masanori Murakami, Mitsuyoshi Okazaki
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Publication number: 20030191605Abstract: An apparatus for maintaining plant equipment incorporates: an input unit to receive information on targets and ranges of plant equipment to be maintained, that constitute a plant, inspection information and operation-history information; a failure-event tree breakdown unit to perform tree-breakdown on failures to be expected from events to be inspected; a failure-unreliability function calculation unit to calculate unreliability of each item in the failure-event tree breakdown; a failure-derived monetary loss calculation unit to multiply each unreliability and a cost of recovery from each event to be inspected and accumulate results of multiplication in accordance with the failure-event tree breakdown, thus obtaining a recovery cost; a preventive maintenance expense calculation unit to calculate preventive maintenance expenses for preventing failure events; and a maintenance decision-making unit to decide maintenance timing and technique through comparison between the recovery cost and the preventive maintenaType: ApplicationFiled: April 9, 2003Publication date: October 9, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kazunari Fujiyama, Toshihiro Fujiwara, Kazuhiro Saito, Taiji Hirawawa, Satoshi Nagai, Hitoshi Kichise, Mitsuyoshi Okazaki, Hirotsugu Kodama, Seiichi Asatsu, Masanori Minowa, Takayuki Iwahashi, Shigeru Harada, Mamoru Sudo, Fumiharu Ishii
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Publication number: 20030191606Abstract: Entered in a plant-maintenance apparatus are data on inspection, diagnosis, repair and operation histories for equipment that constitute a plant to be maintained. Failure-event tree breakdown is performed on failures to be expected for the equipment. Predicted is unreliability of at least one starting item in the failure-event tree breakdown. Unreliability of each item in the failure-event tree is calculated based on failure unreliability function. Unreliability and a cost of recovery from each failure event in the failure-event tree are multiplied and results of the multiplication are accumulated in accordance with the tree breakdown, thus obtaining a recovery cost. Preventive maintenance expenses are calculated for preventing failure events. Maintenance timing and technique are decided through comparison between the recovery cost and the preventive maintenance expenses.Type: ApplicationFiled: April 9, 2003Publication date: October 9, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kazunari Fujiyama, Toshihiro Fujiwara, Kazuhiro Saito, Taiji Hirasawa, Satoshi Nagai, Hitoshi Kichise, Mitsuyoshi Okazaki, Hirotsugu Kodama, Seiichi Asatsu, Masanori Minowa, Takayuki Iwahashi, Shigeru Harada, Mamoru Sudo, Fumiharu Ishii
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Publication number: 20030154051Abstract: A plant diagnosis system friendly to a user (a plant-operating organization) for identifying an abnormality of an objective plant or machinery thereof, is provided. The plant diagnosis system includes a diagnoser's sub-system including a diagnosis computer and a terminal for a diagnosis expert and is connected via a network to a user's sub-system including a terminal for communicating with the diagnoser's sub-system. The plant diagnosis system provides a simple but repetitively available primary diagnosis and a detailed secondary diagnosis including the expert's judgement, which are selectively available on the user's initiative. The diagnosis computer receives a diagnosis request and plant state variables of the plant or machinery and executes the primary diagnosis and a part of the secondary diagnosis based on the plant state valuables.Type: ApplicationFiled: February 12, 2003Publication date: August 14, 2003Applicant: Kabushiki Kaisha ToshibaInventors: Mitsuyoshi Okazaki, Seiichi Asatsu, Shunzo Watanabe