THE BEHAVIOUR OF SHIPS IN CONFUSED SEA; POWER SPECTRAL DENSITY FUNCTION AND LINEAR SUPERPOSITION APPLIED TO THE BEHAVIOUR OF SHIPS IN CONFUSED SEA

IL COMPORTAMENTO DELLE IN MARE TEMPESTOSO; L'APPLICAZIONE DELLA FUNZIONE DENSITA SPETTRALE DI POTENZA E DEL PRINCIPIO DI SOVRAPPOSIZIONE AL COMPORTAMENTO DELLE NAVI IN MARE TEMPESTOSO

In bulletin number 4, the first on the behaviour of ships in confused seas, fundamentals of this theory are shown from the naval architectural view point. The purpose of this paper is to show how to utilize this theory in the study of ships in a confused sea. Some parts which are not important in understanding the main idea of the paper, are printed in different types so that they may be ignored during the first reading. Moreover, sometimes a rigorously theoretical development was neglected to aid an immediate understanding of the subject. In the first part of the paper, an effective mathematical model of a confused sea is built up, stating hypotheses fully in accordance with the facts; a random factor is introduced so as to give rise to a random function to be studied by means of its power spectral density function. In the second part, criteria generally adopted to determine spectral density functions are shown, either with a theoretical or experimental procedure, by means of the harmonic analysis of results, as a function of space and time of a survey on the fetch of the sea. Finally, in the third part, the influence of waves on ship motion is examined, assuming the ship as a constant parameter linear system. In Italian

• Corporate Authors:

  Registro Italiano Navale

  20 Via Vente Settembre
  Genoa,   Italy 
• Authors:
  • Merega, F
• Publication Date: 1966-6

Media Info

• Features: Figures; References; Tables;
• Pagination: 49 p.
• Serial:
  • Issue Number: 7

Subject/Index Terms

• TRT Terms: Electromagnetic spectrum; Power spectra; Ship motion; Waves
• Old TRIS Terms: Irregular waves
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00019316
• Record Type: Publication
• Source Agency: Registro Italiano Navale
• Report/Paper Numbers: Tech Rpt
• Files: TRIS
• Created Date: Nov 8 1971 12:00AM