横断波形解析法による非定常波動場の解析

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タイトル別名
  • Analysis of Undsteady Wave Field by Transverse Cut Method
  • オウダン ハケイ カイセキホウ ニ ヨル ヒテイジョウ ハドウバ ノ カイセキ

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抄録

It is important to know the characteristics of unsteady wave field for the study on seakeeping of ships. There are much information in unsteady waves generated by ships running with a constant forward velocity in waves. Unsteady wave pattern analysis was proposed as a method for extracting the information. The contents are to measure and analysis diffraction and radiation waves around ships and to derive added resistance and wave damping force due to waves directly from the mesured wave pattern. There are two methods in unsteady wave pattern analysis. The one is longitudinal cut method proposed by Ohkusu, that the analytical line is parallel to ship running direction. The other is the transverse cut method proposed by us that it is transverse to the ship moving direction. In the former method, the wave probes can be set up at the fixed point in space and the truncated correction is necessary, because of a restricted water tank correction. This facility is a small-scale. In the later method, as the wave probes must be set up at the moving coordinate with ships, and the method does not need the correction, because the wave elevation gets almost to zero very rapidly near the edge of unsteady wave field. This equipment is a large-scale. As both of two methods have a merit and a demerit respectively, we had better sellect a method to serve our purpose. We carried out the experiments of wave pattern analysis by the transverse cut method with new equipment which is on the moving coordinate with ships and has a small carriage with five wave probes moving perpendicular to ship's course. Finally, we got the wave amplitude function, namely Kochin function. In order to confirm validity of this analysis, we compared with the wave amplitude functions derived from the measured wave patterns and calculated ones. As the mutual relation between unstady wave field and added resistance, wave damping force exists, we also compared with the wave damping force coefficient derived from the measured Kochin function and the radiation tests. And also compared with the added resistance derived from the wave pattern analysis and the calculated one. Good agreement is obtained. We found that validity of the analysis is complete and the new equipment is useful.

収録刊行物

  • 関西造船協会誌

    関西造船協会誌 218 (0), 209-214, 1992

    公益社団法人 日本船舶海洋工学会

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