Mitsubishi Heavy Industries Limited

Fudo Giken Industry Co., Ltd.

Masami Matsuura

Takahiro Hirai

Makoto Nishigaki

Youichi Yamaguchi

Makoto Ohta

Shuji Mizokami

Shinkichi Tanigaki

Hirofumi Nakamura

Iwao Honda

An abnormality determination method for a wind power generation device includes: a measurement step (step S) of measuring sound emitted by the wind power generation device and recording acoustic data; an analysis step (step S) of performing a spectrogram analysis on the acoustic data recorded in the measurement step, on a frequency axis and in a temporal axis space as a temporal change in a frequency characteristic by using the short-time Fourier transform or the wavelet transform; a detection step (step S) of detecting, from the analysis result in the analysis step, a signal component emitted from an abnormal portion of the wind power generation device in a time corresponding to rotation of the wind power generation device; and a determination step (step S) of determining that the wind power generation device is abnormal when the signal component detected in the detection step is greater than or equal to a certain threshold value.

Abnormality determination method for wind power generation device, abnormality determination system for wind power generation device, and abnormality determination program for wind power generation device

A motion reduction apparatus has an orthorhombic shaped floating main body (), a plumb plate supported vertically on one side section of the floating main body by stay members (), and flow sections () for flooding with incoming water are provided between the floating main body and the plumb plate in such a way that an upper end section of the plumb plate is at about the same height as the bottom surface of the floating main body.

Motion reduction apparatus and floating body therewith

A motion reduced floating structure includes a main hull structure and a wave damping structure connected with the main hull structure. The wave damping structure may include a back board, a lower horizontal board and vertical members. The back board is connected with the main hull structure, and the lower horizontal board is connected with a lower portion of the back board to extend in a horizontal direction and is under a seawater surface in case of mooring. The vertical members are connected with the lower horizontal board and the back board. A vertical direction hole is provided for the lower horizontal board.

Motion reduced floating structure

The motion reducing apparatus has an orthorhombic shaped floating main body, a horizontal plumb plate supported horizontally on one side section of the floating main body by stay members, and flow sections for flooding with incoming water are provided between the floating main body and the horizontal plate in such a way that the horizontal plate is at about the same height as the bottom surface of the floating main body.

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Nagasaki, Japan

Masami Matsuura