A concept of apparent energy distribution of sea waves is suggested and named "the outer frequency spectrum" to distinguish it from the frequency spectrum in common sense In line with the concept, a kind of ...A concept of apparent energy distribution of sea waves is suggested and named "the outer frequency spectrum" to distinguish it from the frequency spectrum in common sense In line with the concept, a kind of outer spectrum with three parameters in Cauchy’ s form is derived theoretically from the joint distribution of wave periods and heights reached previously by the present authors and the Bretschneider spectrum is rededuced simply in a distinct manner. The foundation of mechanics of the similarity between the frequency spectrum in common sense and the outer one is briefly discussed. In view of the fact that Bretschneider spectrum has a wide application in engineering, the advantages and probability of using the outer spectrum as a common one are also considered.展开更多
This paper presents a general theory for the apparent energy distribution of sea waves. Using the joint distribution of wave periods and heights proposed earlier by the second author, the authors define the generalize...This paper presents a general theory for the apparent energy distribution of sea waves. Using the joint distribution of wave periods and heights proposed earlier by the second author, the authors define the generalized apparnt energy distribution and derive the analytical form of the so called generalized outer frequency spectrum or nth-order frequency spectrum. Some possible relationships between it and the Fourier frequency spectrum are discussed. It is shown that the widely used Bretschneider spectrum can be easily obtained from the above definition and that generalized outer frequency spectrum has equilibrium range with exponent -(n+3) whose upper limit is -3.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘A concept of apparent energy distribution of sea waves is suggested and named "the outer frequency spectrum" to distinguish it from the frequency spectrum in common sense In line with the concept, a kind of outer spectrum with three parameters in Cauchy’ s form is derived theoretically from the joint distribution of wave periods and heights reached previously by the present authors and the Bretschneider spectrum is rededuced simply in a distinct manner. The foundation of mechanics of the similarity between the frequency spectrum in common sense and the outer one is briefly discussed. In view of the fact that Bretschneider spectrum has a wide application in engineering, the advantages and probability of using the outer spectrum as a common one are also considered.
文摘This paper presents a general theory for the apparent energy distribution of sea waves. Using the joint distribution of wave periods and heights proposed earlier by the second author, the authors define the generalized apparnt energy distribution and derive the analytical form of the so called generalized outer frequency spectrum or nth-order frequency spectrum. Some possible relationships between it and the Fourier frequency spectrum are discussed. It is shown that the widely used Bretschneider spectrum can be easily obtained from the above definition and that generalized outer frequency spectrum has equilibrium range with exponent -(n+3) whose upper limit is -3.
