Accession Number : ADA013415


Title :   Generation of Wave Amplitude and Orbital Particle Velocity Field of a Random Sea


Descriptive Note : Research memo.


Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE NY RESEARCH DEPT


Personal Author(s) : Rossi, Michael


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a013415.pdf


Report Date : Aug 1975


Pagination or Media Count : 16


Abstract : In designing vehicles capable of weathering rough seas produced by intense, persevering storms, some method of generating a representation of the important effects of a random sea must be employed. The proposed technique models the wave amplitude as a function of horizontal location and time and evaluates the accompanying horizontal and vertical components of orbital particle velocity as a function of horizontal and vertical location and time. The underlying definition of a random sea is in terms of a Gaussian, stationary random process with a Pierson-Moskowitz spectral density function for the wave amplitude at some reference point. The method is suitable for computing probability distributions for the vehicle state variables whether or not the vehicle dynamics are governed by a linear differential equation. If the dynamics are linear, the actual Gaussian stationary probability distribution can be computed through solution of an algebraic system. For the nonlinear case, random number generation and numerical integration produce time averages to approximate ensemble averages in estimating any number of statistical moments. (Author)


Descriptors :   *SEA STATES , *OCEAN WAVES , *RANDOM VARIABLES , PROBABILITY DISTRIBUTION FUNCTIONS , STATISTICS , LINEAR DIFFERENTIAL EQUATIONS , ERRORS , STORMS , AMPLITUDE , ROUGHNESS , BUOYS , HYDROFOILS , DYNAMICS , OCEAN SURFACE , VELOCITY , PARTICLES


Subject Categories : Physical and Dynamic Oceanography
      Statistics and Probability
      Marine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE