Patents by Inventor Naotaka Mikami

Naotaka Mikami 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).

  • Patent number: 10648888
    Abstract: Provided is a plant state monitoring method which monitors an operation state of a plant by using the Mahalanobis distance based on the plant state amount. The method creates a first unit space as a set of data used to be a reference when judging whether the plant operation state during a start operation period is normal according to the state amount in the plant start operation period. The method also creates a second unit space as a set of data used to be a reference when judging whether the plant operation state during a load operation period is normal according to the state amount in the plant load operation period.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: May 12, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Masayuki Takahama, Naotaka Mikami, Masashi Inoue, Yoshiyuki Hamaji
  • Publication number: 20150293531
    Abstract: A plant monitoring device for monitoring the operation state of a plant, the plant monitoring device including: state quantity acquisition means for acquiring a bundle of state quantities; state quantity storage means in which the state quantity acquisition means stores the bundle of state quantities; unit space storage means for storing a unit space constituted by a collection of a plurality of bundles of state quantities; state quantity extraction means for extracting a bundle of state quantities; Mahalanobis distance calculation means for calculating, at every evaluation cycle, the Mahalanobis distance of the bundle of state quantities; determination means for determining whether or not the operation state of the plant is normal; and unit space update means for adding the bundle of state quantities to the unit space while deleting the oldest bundle of state quantities from the unit space at every predefined update cycle longer than the evaluation cycle.
    Type: Application
    Filed: October 25, 2012
    Publication date: October 15, 2015
    Applicant: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventor: Naotaka Mikami
  • Publication number: 20140278237
    Abstract: Provided is a plant state monitoring method which monitors an operation state of a plant by using the Mahalanobis distance based on the plant state amount. The method creates a first unit space as a set of data used to be a reference when judging whether the plant operation state during a start operation period is normal according to the state amount in the plant start operation period. The method also creates a second unit space as a set of data used to be a reference when judging whether the plant operation state during a load operation period is normal according to the state amount in the plant load operation period.
    Type: Application
    Filed: May 30, 2014
    Publication date: September 18, 2014
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Masayuki TAKAHAMA, Naotaka MIKAMI, Masashi INOUE, Yoshiyuki HAMAJI
  • Publication number: 20100198555
    Abstract: Provided is a plant state monitoring method which monitors an operation state of a plant by using the Mahalanobis distance based on the plant state amount. The method creates a first unit space as a set of data used to be a reference when judging whether the plant operation state during a start operation period is normal according to the state amount in the plant start operation period. The method also creates a second unit space as a set of data used to be a reference when judging whether the plant operation state during a load operation period is normal according to the state amount in the plant load operation period.
    Type: Application
    Filed: February 27, 2009
    Publication date: August 5, 2010
    Applicant: Mitsubishi Heavy Industries, Ltd.
    Inventors: Masayuki Takahama, Naotaka Mikami, Masashi Inoue, Yoshiyuki Hamaji