Extreme Wave Heights and Ship Responses in a Seaway.
Abstract
Long, statistical experiments on the distribution of the maxima of linear ship responses and wave heights were performed on two models of a Destroyer Escort. Mean square values, mean square values of the maxima and the average of the l/n highest values of the maxima of the processes were measured. The results were compared with theoretical relations. In the case of prediction of the mean square of the maxima and the average l/n highest values of the maxima, the proposed theoretical relations agree with the experimental results much better than presently used relations. The proposed relations take into account the mean square of the processes and the broadness factor of their spectral density functions. Their application leads to smaller extreme values and in particular to a 7% decrease for the design bending moment. It is also expected that application of the new relations will result in better prediction of seakeeping events such as slamming, wetness, etc. A computer program for statistical analysis of a digital seakeeping record is also presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1970
- Accession Number
- AD0877126
Entities
People
- Theodore A. Loukakis
Organizations
- Massachusetts Institute of Technology