Patents by Inventor Fumiaki Uehan

Fumiaki Uehan 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).

  • Method and apparatus for determining seismic vulnerability of a structure
    Patent number: 5663501
    Abstract: In order to determine the seismic vulnerability of a structure, a vibration sensor is placed on each of the top surface of a layer of the structure and the ground surface near the structure so as to record vibrations. A seismic vulnerability data processor assumes a transfer function of vibration of the top surface of the layer of the structure based on a spectral ratio between the vibration recorded on the top surface of the layer of the structure and the vibration recorded on the ground surface, thereby obtaining a predominant frequency and amplification factor of vibration of the top surface of the layer of the structure. A seismic vulnerability index of the layer of the structure resulting from a deformation of the layer is obtained based on the obtained predominant frequency and amplification factor of vibration of the top surface of the layer of the structure and on the height of the layer of the structure.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: September 2, 1997
    Assignees: Railway Technical Research Institute and Co., Ltd., System and Data Research
    Inventors: Yutaka Nakamura, Fumiaki Uehan, Masayuki Nishinaga