随机风浪作用下游艇横摇稳性可靠度计算
发布时间：2018-12-11 17:39
【摘要】：随着我国经济的蓬勃发展,游艇逐渐成为人们可接受的消费、休闲方式,游艇稳性是衡量游艇性能的重要指标,如何衡量并改善游艇稳性是设计人员必须考虑的重要问题。传统稳性衡准基于静力学,将游艇风浪中的稳性视为确定性事件,实际游艇受到风浪外力具有随机性,且游艇本身抗倾覆能力随游艇的横摇与纵摇运动也会发生变化,导致游艇风浪中的稳性是具有一定概率的随机事件。可靠性理论综合考虑游艇稳性指标以及外力的随机性,用可靠度指标和倾覆概率描述游艇稳性,计算游艇不同风浪以及不同海域的稳性可靠度,可更科学的描述游艇稳性。基于对以上问题的思考,本文针对随机风浪下游艇的横摇运动,建立游艇非线性运动微分方程,利用非线性过程理论和路径积分法求解该方程,引入两艘实际游艇,计算不同风浪条件下游艇联合概率密度及横摇角边缘概率密度。计算游艇不同浮态下的进水角数据并进行统计,得到游艇进水角均值与均方差。根据可靠度计算理论,以横摇角大于进水角为游艇失稳标准,建立稳性极限状态方程,计算游艇不同风浪下稳性可靠度,并对游艇不同海域中的稳性可靠度进行计算。利用水动力学软件对游艇稳性进行仿真实验,以验证游艇稳性可靠度计算方法的可行性。通过实例研究进水角位置、非线性阻尼力矩系数、三次恢复力矩系数对游艇稳性可靠度的影响。最后,基于游艇稳性可靠度计算结果,对不同海域、不同风浪条件下游艇稳性进行安全等级划分,对游艇稳性安全等级的科学评判进行有益的尝试。论文利用非线性随机过程理论和可靠度计算方法,研究游艇稳性可靠度,并验证游艇稳性可靠度计算方法的可行性与适用性。以实际游艇为例研究游艇稳性可靠度的影响因素,计算结果表明,游艇甲板高度增加0.16m或游艇宽度增加0.1m可将游艇稳性可靠度提高0.1,以上两因素对游艇可靠度影响较显著,进行游艇可靠度优化时可在满足游艇性能与工艺的前提下对甲板高度和艇宽进行选择。基于游艇稳性可靠度计算结果,对不同海域中不同风浪下游艇稳性进行安全等级划分,有利于游艇设计人员对游艇安全威胁进行评估,游艇操纵者可针对不同海况进行决策,游艇管理者可根据不同海域游艇稳性安全级别,确定游艇安全行驶的风浪等级范围。
[Abstract]:With the rapid development of our country's economy, yacht becomes an acceptable consumption, leisure mode, yacht stability is an important index to measure yacht performance, how to measure and improve yacht stability is an important issue that designers must consider. The traditional stability balance is based on statics, and the stability of the yacht is regarded as a deterministic event. The actual yacht is random by the external force of the wind and waves, and the capsizing ability of the yacht itself changes with the rolling and pitching motion of the yacht. The stability of a yacht is a random event with a certain probability. The reliability theory synthetically considers the yacht stability index and the randomness of the external force, describes the yacht stability with the reliability index and the capsizing probability, calculates the yacht stability reliability of different wind waves and different sea areas, can more scientifically describe the yacht stability. Based on the above problems, the differential equations of nonlinear motion of yachts under random wind and waves are established. The nonlinear process theory and path integral method are used to solve the equations, and two actual yachts are introduced. The joint probability density and roll angle edge probability density are calculated under different wind and wave conditions. The mean and mean square deviation of the influent angle of the yacht are obtained by calculating the data of the influent angle of the yacht under different floating states and making statistics. According to the reliability calculation theory, the stability limit state equation is established and the stability reliability of the yacht in different sea area is calculated by taking the roll angle greater than the influent angle as the criterion of the yacht instability. The hydrodynamic software is used to simulate the stability of the yacht to verify the feasibility of the calculation method of the stability of the yacht. The influence of inlet angle position, nonlinear damping moment coefficient and cubic recovery moment coefficient on the stability reliability of the yacht is studied by an example. Finally, based on the calculation results of yacht stability reliability, the safety grade of yacht stability in different sea areas and different wind and wave conditions is divided, and the scientific evaluation of yacht stability level is made a beneficial attempt. In this paper, the nonlinear stochastic process theory and reliability calculation method are used to study the yacht stability reliability, and to verify the feasibility and applicability of the yacht stability reliability calculation method. Taking the actual yacht as an example, the influencing factors of the yacht stability reliability are studied. The calculated results show that the yacht stability reliability can be increased by 0.1 m by increasing the deck height or the width of the yacht by 0.16 m, or by 0.1 m by the increase of the width of the yacht. The above two factors have a significant influence on the yacht reliability. The deck height and the boat width can be selected when the yacht reliability optimization is carried out on the premise of satisfying the yacht performance and craft. Based on the calculation results of yacht stability reliability, the classification of yacht stability in different sea areas under different wind and waves is helpful for yacht designers to evaluate yacht safety threats, and yacht operators can make decisions according to different sea conditions. The yacht manager can determine the safe range of sailing according to the safety level of yacht in different sea area.
【学位授予单位】：集美大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U661.32
本文编号：2372954
[Abstract]:With the rapid development of our country's economy, yacht becomes an acceptable consumption, leisure mode, yacht stability is an important index to measure yacht performance, how to measure and improve yacht stability is an important issue that designers must consider. The traditional stability balance is based on statics, and the stability of the yacht is regarded as a deterministic event. The actual yacht is random by the external force of the wind and waves, and the capsizing ability of the yacht itself changes with the rolling and pitching motion of the yacht. The stability of a yacht is a random event with a certain probability. The reliability theory synthetically considers the yacht stability index and the randomness of the external force, describes the yacht stability with the reliability index and the capsizing probability, calculates the yacht stability reliability of different wind waves and different sea areas, can more scientifically describe the yacht stability. Based on the above problems, the differential equations of nonlinear motion of yachts under random wind and waves are established. The nonlinear process theory and path integral method are used to solve the equations, and two actual yachts are introduced. The joint probability density and roll angle edge probability density are calculated under different wind and wave conditions. The mean and mean square deviation of the influent angle of the yacht are obtained by calculating the data of the influent angle of the yacht under different floating states and making statistics. According to the reliability calculation theory, the stability limit state equation is established and the stability reliability of the yacht in different sea area is calculated by taking the roll angle greater than the influent angle as the criterion of the yacht instability. The hydrodynamic software is used to simulate the stability of the yacht to verify the feasibility of the calculation method of the stability of the yacht. The influence of inlet angle position, nonlinear damping moment coefficient and cubic recovery moment coefficient on the stability reliability of the yacht is studied by an example. Finally, based on the calculation results of yacht stability reliability, the safety grade of yacht stability in different sea areas and different wind and wave conditions is divided, and the scientific evaluation of yacht stability level is made a beneficial attempt. In this paper, the nonlinear stochastic process theory and reliability calculation method are used to study the yacht stability reliability, and to verify the feasibility and applicability of the yacht stability reliability calculation method. Taking the actual yacht as an example, the influencing factors of the yacht stability reliability are studied. The calculated results show that the yacht stability reliability can be increased by 0.1 m by increasing the deck height or the width of the yacht by 0.16 m, or by 0.1 m by the increase of the width of the yacht. The above two factors have a significant influence on the yacht reliability. The deck height and the boat width can be selected when the yacht reliability optimization is carried out on the premise of satisfying the yacht performance and craft. Based on the calculation results of yacht stability reliability, the classification of yacht stability in different sea areas under different wind and waves is helpful for yacht designers to evaluate yacht safety threats, and yacht operators can make decisions according to different sea conditions. The yacht manager can determine the safe range of sailing according to the safety level of yacht in different sea area.
【学位授予单位】：集美大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U661.32
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