Topic
Ship motion test
About: Ship motion test is a research topic. Over the lifetime, 3 publications have been published within this topic receiving 15 citations.
Papers
TL;DR: In this paper, the experimental data have been analyzed at encounter frequency base using both Fast Fourier Transformation (FFT) and Maximum Entropy Method (MEM) to obtain the power spectrum of motions and the results are presented along with the theoretical estimates.
Abstract: As a continuation to our previuos report on tank testing results of ship motions in directional spectrum waves this paper presents further test results under 'following sea' condition. Uniform irregular waves with arbitrary directional spectrum have been generated in the whole area of towing tank of Yokohama National University by the newly installed snake type wave maker and running tests have been carried out at Froude numbers 0.2 and 0.275. The experimental data have been analyzed at encounter frequency base using both Fast Fourier Transformation (FFT) and Maximum Entropy Method (MEM) to obtain the power spectrum of motions and the results are presented along with the theoretical estimates. Directional transfer functions of motions have been calculated using well known New Strip Method (NSM) and analyzed directional wave spectra obtained from experimental data by Maximum Likelihood Method (MLM) have been used to estimate theorectical motion spectra. The compared results show fairly good agreement.This paper also presents short term prediction of motions calculated for both 'head sea' and 'following sea' conditions over venous range of wave periods.
12 citations
1 Dec 1989
2 citations
TL;DR: In this article, a detailed explanation about experimental techniques, apparatus and a method of numerical analysis for the practical uses of testing ship models in transient water waves is given, and the measured results in transient waves and in Fegular waves coincide, also the calculated values by the strip method are roughly coincided with the both measured results.
Abstract: The previous papers by the same or another authors have certified that the testing ship models in transient water waves is one of the useful method for the investigation of ship frequency transfer functions in waves.Then, the present paper gives a detailed explanation about experimental techniques, apparatus and a method of numerical analysis for the practical uses of testing ship models in transient water waves.Moreover quoting a testing example, it is shown that the measured results in transient waves and in Fegular waves coincide, also the calculated values by the strip method are roughly coincided with the both measured results.It is desirable that the model experiments in transient water waves take place of the experiments in regular waves for the investigation of linear ship transfer functions in waves, because the occupancy of model basins for ship motion test is remarkably decreased and the execution of the present method is easy.
1 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 1989 | 2 |
| 1970 | 1 |