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Marine_Structural_Design Episode 2

Tham khảo tài liệu 'marine_structural_design episode 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part I Structural Design Principles Chapter 2 Wave Loads for Ship Design and Classification 2.1 Introduction One of the major aspects of ship design is the calculation of wave-induced loads on the ship structure. The difficulty in calculating this load arises from the fact that the sea is highly irregular. Hence a number of techniques have been developed to tackle this problem. These techniques enable the sea waves be defined in a mathematical form and this may then be used to calculate the wave loads on the ship and ultimately the response of the ship to these loads. When designing a ship formulae provided by classification societies are used in order to calculate the wave loads and ship response. However a ship designer ought to have some knowledge of the theory and techniques utilized for the statistical determination of wave loads. Novel ship designs also exist which require an extensive statistical estimation of the wave loads to be undertaken in addition to using rule-based formulae alone. As a basis for marine structural design the objectives of this Chapter are threefold Present various ocean wave spectra and wave statistics Discuss the wave-induced loads slamming and green-water loads and hence the response of the ship Outline the design load calculations per ship classification rules. For more information on wave loads acting on ship structures reference is made to Bhattacharyya 1978 Hughes 1988 and Jensen 2001 . 2.2 Ocean Waves and Wave Statistics 2.2.1 Basic Elements of Probability and Random Process Obtaining ocean wave data requires the use of different elements of statistics and probability. Therefore an introductory reference to statistics and probability is given prior to dealing with wave loads. In statistics a random variable X is an event or an outcome among all possible outcomes. If all possible outcomes form a continuous space -00 X 00 and all events possible are a part of this space then the probability density function of an event occurring