Patents by Inventor Naoaki Shibashita

Naoaki Shibashita 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).

  • Steam turbine test facility, low-load test method, and load dump test method
    Patent number: 8132448
    Abstract: A steam turbine test facility 1 includes a test steam turbine 2 which simulates the behavior of a real steam turbines 11 included in the steam turbine plant 10, and a motor-generator 4 connected to the test steam turbine 2. A control unit 5 included in the motor-generator 4 controls the motor-generator 4 to change the rotational speed of the test steam turbine 2 based on an arbitrarily set speed change pattern. The speed change pattern is set such that the test steam turbine 2 in the load disconnection state simulates a time-profile of the rotational speed of the steam turbines 11 with the load disconnected.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: March 13, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Tateki Nakamura, Takeshi Kudo, Naoaki Shibashita
  • STEAM TURBINE TEST FACILITY, LOW-LOAD TEST METHOD, AND LOAD DUMP TEST METHOD
    Publication number: 20100162802
    Abstract: It is an object of the present invention to provide a steam turbine test facility including a test steam turbine, in which the behavior of an actual steam turbine can be precisely simulated and the efficiency of performance test can be improved. A steam turbine test facility 1 includes a test steam turbine 2 which simulates the behavior of a real steam turbines 11 included in the steam turbine plant 10, and a motor-generator 4 connected to the test steam turbine 2. A control unit 5 included in the motor-generator 4 controls the motor-generator 4 to change the rotational speed of the test steam turbine 2 based on an arbitrarily set speed change pattern. The speed change pattern is set such that the test steam turbine 2 in the load disconnection state simulates a time-profile of the rotational speed of the steam turbines 11 with the load disconnected.
    Type: Application
    Filed: December 22, 2009
    Publication date: July 1, 2010
    Applicant: HITACHI, LTD.
    Inventors: Tateki NAKAMURA, Takeshi KUDO, Naoaki SHIBASHITA
  • Method of and system for assessing the safety of shrinkage fitted type rotor
    Patent number: 4770046
    Abstract: A method system for assessing the safety of a rotor of a shrinkage fitted type wherein an opening displacement of a crack is determined an elastic-plastic fracture method and a reduction in shrinkage fitting force is calculated based on the crack opening displacement. The safety of the rotor is assessed based on the reduction in shrinkage fitting force caused to occur by the opening of the crack.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: September 13, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Kanno, Shinji Sakata, Tasuku Shimizu, Ryoichi Kaneko, Kiyoshi Shimomura, Naoaki Shibashita
  • Method and an apparatus for starting a turbine having a shrinkage-fitted rotor
    Patent number: 4688385
    Abstract: A method of starting a turbine having a shrinkage-fitted rotor provided by shrinkage-fitting discs onto a shaft comprises the steps of raising the temperature of the rotor above a predetermined temperature determined from a physical value of the material constituting the rotor and, thereafter, raising the rotational speed of the turbine from the turning speed to the rated speed, whereby the centrifugal stress on raising the speed acts on the discs in a state wherein the value of fracture toughness of the discs fitted on to the shaft has increased.
    Type: Grant
    Filed: January 23, 1985
    Date of Patent: August 25, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Naoaki Shibashita, Hajime Toriya, Kiyoshi Shimomura, Haruo Urushidani, Ryoichi Kaneko