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Large waves in the navigation system of


rC proposed visual characteristic period is approximately equal to the average cycle; H price is the average significant wave height. 2.1.3 Calculation of ship subsystems swaying motions of a ship sailing in the great storms of factors affect the navigation performance of not just roll, pitch, yaw, heave, surge and sway, and bow acceleration , deck flooded wetlands, Speed, stall, slamming the bottom or side of the deck, the vertical wave bending moment, loss of stability, control performance degradation. Thus in the design of navigation systems to be calculated before the big storm the ship sailing under the conditions of performance factors in all sports gesture. As the ship at sea wave disturbance generated by the movement of the ship can be seen as a stationary random process on the dynamic response can be obtained from the spectral analysis theory: S (60): 【Y (60)】 * S (60) where S, () for random wave spectral density function; 【Y. (60)】 for the ship motion response amplitude operator; S (60) for the ship motion spectral density function; 60 hit for the ship motion frequency, 60 = 60 ~ (60 / g) Vcosla, g is acceleration due to gravity, for the wave to angle (angle of 180 degrees), V the speed of the ship. Ship motion in the received spectral density function, by the smooth conversion of linear relationship between the spectrum of the system: one and then the ship can be calculated using statistical knowledge of the movements (roll, pitch, yaw, heave, surge and cross swing, etc.) features a variety of sports. (1) vertical movement of the calculation of relative and absolute. When a ship in waves produced pitching and heaving motion, the board will produce a vertical position of absolute motion and relative motion and vertical acceleration. Vertical absolute displacement, velocity, acceleration is calculated as: H = H a z * H6, + YHIlHv = 60 * HH = a 6060 * H where z,[link widoczny dla zalogowanych], Y coordinates of any point on board; heave, pitch, rol1 were down swing, pitch, roll; the circular frequency, frequency encountered at sea applications; Hheave = port * COS (60 * t ten e: A c) =* \to heave the ship and the waves relative phase difference, the definition of other similar H and heave. vertical relative motion is calculated as: H = H a z * H6l + YHmf-H one of the waves as the ship rose to a point; the waves to the corner, when the top of the waves when it was 180 degrees; to volatility; k is wave number; 60 for the encounter frequency; H =* COS 【k (z * COSp-Ysin / a) + t *)】. and then follow the smooth linear transformation between the spectrum can be obtained relative somewhere on board,[link widoczny dla zalogowanych], the variance of absolute displacement and velocity and acceleration of the variance. (2) flooded wet deck and the propeller water calculations. Since the movement of waves and the ship is a normal random process, and relatively movement is due to waves,[link widoczny dla zalogowanych], the ship pitching and heaving and rolling motion of linear combinations, so the relative motion can be considered as normal random process. by the relative motion displacement amplitude frequency response that can be obtained Changfeng ships in irregular waves navigation relative motion r (t) the spectral density: Jt.J2s, = ffsrI mouth I can get the relative motion resulting variance: 2rSrrI contention ∞ '0 '0 IdI where S (60) for the spectral density. for the volatility. and Because the relative motion at the bow is normal narrow band process, so its amplitude obey the Rayleigh distribution: Factory. = exp (-r]): r ~ = exp (a) so that the bow and the bow freeboard h the variance of the Ministry of relative motion at / Tt. that can get wet deck of the probability of flooding. Considering the voyage stationary waves caused the water rose, f, h is less need to fix the plant. take = e0.35 (~-i) coS [Yun Pu (, 0.0025Fr ten 0.005) LcosI) where = 0.75 = L is the length of the inlet, B the half-width, F is Fourier number, L the length between two columns, z is the consider the distance of a pitch boat. (3) probability of slamming. When a ship sailing in the great storms occur when intense pitching and heaving motion,[link widoczny dla zalogowanych], when the ship somewhere and causing relative motion wave surface exposed hull bottom wave surface, and its relative velocity reaches a critical value,[link widoczny dla zalogowanych], the ship re-enters the water, slamming occurs. hull slamming is also a Poisson process, from a statistical point of view the wet and flooded the deck, they flooded the deck difference is only relative humidity movement function, slamming is the relative motion and relative velocity of the function. in accordance with the Ochi and Kazuo way, slamming the probability of the expression is: ~ xp [a (x)] where d is z at the draft, for Pro relative velocity, m is the variance of the relative motion at z, m: is the variance of X at the relative velocity. 2.2 Measurement Module main advantage of this system on board existing instruments to measure waves and sailing ship in rough seas in the System - - Xiongwen Hai Mao Jiang Xiao Fei Liyu
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