Patents by Inventor Fumiharu Ishii
Fumiharu Ishii 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: 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: 6801871Abstract: For each component which is used at a high in-service temperature for a long period, its creep damage degree is approximated by a relational expression containing the Larson-Miller parameter. The creep damage degree is estimated by an approximation expression obtained by determining constants for each component. The creep damage degree is subjected to Weibull statistical analysis to estimate the creep damage degree probabilistically. Also, the thermal fatigue and damage degree obtained by an approximation expression is likewise subjected to Weibull statistical analysis to estimate the thermal fatigue and damage degree probabilistically. Therefore, the probabilistically estimated creep damage degree and the probabilistically estimated thermal fatigue and damage degree allows the life of each component subjected to a high in-service temperature to be assessed precisely and quickly.Type: GrantFiled: October 7, 2003Date of Patent: October 5, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Fumiharu Ishii, Nagatoshi Okabe
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Publication number: 20040107067Abstract: For each component which is used at a high in-service temperature for a long period, its creep damage degree is approximated by a relational expression containing the Larson-Miller parameter. The creep damage degree is estimated by an approximation expression obtained by determining constants for each component. The creep damage degree is subjected to Weibull statistical analysis to estimate the creep damage degree probabilistically. Also, the thermal fatigue and damage degree obtained by an approximation expression is likewise subjected to Weibull statistical analysis to estimate the thermal fatigue and damage degree probabilistically. Therefore, the probabilistically estimated creep damage degree and the probabilistically estimated thermal fatigue and damage degree allows the life of each component subjected to a high in-service temperature to be assessed precisely and quickly.Type: ApplicationFiled: October 7, 2003Publication date: June 3, 2004Inventors: Fumiharu Ishii, Nagatoshi Okabe
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Patent number: 6671647Abstract: For each component which is used at a high in-service temperature for a long period, its creep damage degree is approximated by a relational expression containing the Larson-Miller parameter. The creep damage degree is estimated by an approximation expression obtained by determining constants for each component. The creep damage degree is subjected to Weibull statistical analysis to estimate the creep damage degree probabilistically. Also, the thermal fatigue and damage degree obtained by an approximation expression is likewise subjected to Weibull statistical analysis to estimate the thermal fatigue and damage degree probabilistically. Therefore, the probabilistically estimated creep damage degree and the probabilistically estimated thermal fatigue and damage degree allows the life of each component subjected to a high in-service temperature to be assessed precisely and quickly.Type: GrantFiled: April 13, 2001Date of Patent: December 30, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Fumiharu Ishii, Nagatoshi Okabe
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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: 20020013643Abstract: For each component which is used at a high in-service temperature for a long period, its creep damage degree is approximated by a relational expression containing the Larson-Miller parameter. The creep damage degree is estimated by an approximation expression obtained by determining constants for each component. The creep damage degree is subjected to Weibull statistical analysis to estimate the creep damage degree probabilistically. Also, the thermal fatigue and damage degree obtained by an approximation expression is likewise subjected to Weibull statistical analysis to estimate the thermal fatigue and damage degree probabilistically. Therefore, the probabilistically estimated creep damage degree and the probabilistically estimated thermal fatigue and damage degree allows the life of each component subjected to a high in-service temperature to be assessed precisely and quickly.Type: ApplicationFiled: April 13, 2001Publication date: January 31, 2002Inventors: Fumiharu Ishii, Nagatoshi Okabe