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 Wysłany: Sob 4:42, 11 Gru 2010 Temat postu: ugg boots billig Towing strength check of stochast |
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Towing strength check of stochastic simulation methods
Is not satisfied with the security requirements. The following discussion to meet the towing streamer under the conditions of strength problems. Towing dynamic tension set of random variables is a function of random variable D. According to the probability density function D, (T),[link widoczny dla zalogowanych], a computer generated random numbers normally distributed random values, we calculated a random number. r A To. At this time. r (a 1,2, ..., 7z), and wave period of the surge and pull the sample size and small variance changes, thereby changing the wave of the impact of environmental factors can be drawn the case when small changes occur. It should be noted that, due to the different environment and different towing objects, caused by the waves pull the total time-varying volatility in a range]. Tow rope tow in the whole process are subject to the role of the dynamic tension to simulate the dynamic tension of the towing system may consider the impact of:: Plastic Castle Church of Mexico Vol 18 time intervals, the random dynamic towline tension. Beyond the allowable values for the statistical case that i> JET] XU, through dynamic towline pull out of the number of allowable values, k is the dynamic tension beyond the allowable value of statistics, located within the prescribed period of time were produced, z a dynamic tension, record p = k / n (p as the probability of failure), so that the towing system is safe. Select a 24h day and night here the impact of the situation that may arise as a sample, select the shock of every 1000 times the number of overloaded towing the probability P. Data as judged by the decision to determine the size of P iv whether the system is safe. 4 Example results of a towing program is: streamer static tension T. = 88.91kN; bow wave and surge generated tension T ... = 13.34kN; the waves have to obey time-varying tension T ~ N (0,10.84); surge cycle 3.2min, wave period 1. 8s, calculated using the tow rope 17mm diameter case, the allowable strength 143.86kN. Towline tension under dynamic stochastic simulation shown in Figure 2. Volume \ ( a cycle 02O4O6O801OOT/ks (b) 24h Figure 2 under dynamic tension Towing Figure 2 Stochastic Simulation of streamer were simulated in a cycle and 24h may be a dynamic tension within the shock. In a cycle diagram, it is clear that the towline of a surge cycle can reach the maximum tension value. In the 24h simulation of the figure, the impact of randomly generated 102,720 plays (a 1.0272 × 10), of which 3 times the impact beyond the allowable tension. Can be obtained as p = k / n = 3 / 102720 ~ 2.92 × 10 one, according to the probability per thousand impact on the requirements of not more than 0.5 Ⅲ, take P. . . ≈ O. 03. That the design meets the safety requirements. 5 Conclusion random simulation method estimates may be subject to towing and then assessed the dynamic tension of the safety of towing, towing for improving the safety and very useful. For the program in the streamers known intensity can be estimated by simulating the impact of towing load,[link widoczny dla zalogowanych], and verify that the program is reasonable. For non-ideal solution, you can change the safety factor of the design process in order to meet safety requirements. During the simulation,[link widoczny dla zalogowanych], the dynamic tension of the composition is very complex, especially between the tug and tow pulse wave caused by the accumulation of forces often rely on statistical practice, this issue needs further study and solve. References: [1] Chen Xiaohong, Ren Kai, Cheng Zhibin. Influencing factors of towing security method for determining the weights [J]. Naval University of Engineering, 2005,17 (5): 9o a 94. [2] TriantafyllouMS. NonlinearDynamicofMarineCablesandHawsers [R]. Mass: MITCambridge, 1987. [A-tDesrochesAS. CalculationofExtremeTowlineTensionDuring () penSeaTowing [D]. Massachusetts: MassachusellsInstitueofTechnology,[link widoczny dla zalogowanych], 1997. [4] MarshB. TowingManual [M]. u. s. A. NavalSeaSystemsCommand, 2002. [5] Pu Jin Yun, Yow Kam Shui, Cheng Zhibin. Ship Survivability [M]. Beijing: Tide Press,[link widoczny dla zalogowanych], 2001. F6] Pu Jin Yun + surface ships vitality l-M]. Wuhan: Naval Engineering University, 2000. [7] Wang Rongxin. Random process [M]. Xi'an: Xi'an Jiaotong University Press, 1987.
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