發(fā)布時間：2018-12-11 17:39

【摘要】：隨著我國經(jīng)濟(jì)的蓬勃發(fā)展,游艇逐漸成為人們可接受的消費(fèi)、休閑方式,游艇穩(wěn)性是衡量游艇性能的重要指標(biāo),如何衡量并改善游艇穩(wěn)性是設(shè)計人員必須考慮的重要問題。傳統(tǒng)穩(wěn)性衡準(zhǔn)基于靜力學(xué),將游艇風(fēng)浪中的穩(wěn)性視為確定性事件,實際游艇受到風(fēng)浪外力具有隨機(jī)性,且游艇本身抗傾覆能力隨游艇的橫搖與縱搖運(yùn)動也會發(fā)生變化,導(dǎo)致游艇風(fēng)浪中的穩(wěn)性是具有一定概率的隨機(jī)事件�？煽啃岳碚摼C合考慮游艇穩(wěn)性指標(biāo)以及外力的隨機(jī)性,用可靠度指標(biāo)和傾覆概率描述游艇穩(wěn)性,計算游艇不同風(fēng)浪以及不同海域的穩(wěn)性可靠度,可更科學(xué)的描述游艇穩(wěn)性�；趯σ陨蠁栴}的思考,本文針對隨機(jī)風(fēng)浪下游艇的橫搖運(yùn)動,建立游艇非線性運(yùn)動微分方程,利用非線性過程理論和路徑積分法求解該方程,引入兩艘實際游艇,計算不同風(fēng)浪條件下游艇聯(lián)合概率密度及橫搖角邊緣概率密度。計算游艇不同浮態(tài)下的進(jìn)水角數(shù)據(jù)并進(jìn)行統(tǒng)計,得到游艇進(jìn)水角均值與均方差。根據(jù)可靠度計算理論,以橫搖角大于進(jìn)水角為游艇失穩(wěn)標(biāo)準(zhǔn),建立穩(wěn)性極限狀態(tài)方程,計算游艇不同風(fēng)浪下穩(wěn)性可靠度,并對游艇不同海域中的穩(wěn)性可靠度進(jìn)行計算。利用水動力學(xué)軟件對游艇穩(wěn)性進(jìn)行仿真實驗,以驗證游艇穩(wěn)性可靠度計算方法的可行性。通過實例研究進(jìn)水角位置、非線性阻尼力矩系數(shù)、三次恢復(fù)力矩系數(shù)對游艇穩(wěn)性可靠度的影響。最后,基于游艇穩(wěn)性可靠度計算結(jié)果,對不同海域、不同風(fēng)浪條件下游艇穩(wěn)性進(jìn)行安全等級劃分,對游艇穩(wěn)性安全等級的科學(xué)評判進(jìn)行有益的嘗試。論文利用非線性隨機(jī)過程理論和可靠度計算方法,研究游艇穩(wěn)性可靠度,并驗證游艇穩(wěn)性可靠度計算方法的可行性與適用性。以實際游艇為例研究游艇穩(wěn)性可靠度的影響因素,計算結(jié)果表明,游艇甲板高度增加0.16m或游艇寬度增加0.1m可將游艇穩(wěn)性可靠度提高0.1,以上兩因素對游艇可靠度影響較顯著,進(jìn)行游艇可靠度優(yōu)化時可在滿足游艇性能與工藝的前提下對甲板高度和艇寬進(jìn)行選擇�；谟瓮Х�(wěn)性可靠度計算結(jié)果,對不同海域中不同風(fēng)浪下游艇穩(wěn)性進(jìn)行安全等級劃分,有利于游艇設(shè)計人員對游艇安全威脅進(jìn)行評估,游艇操縱者可針對不同海況進(jìn)行決策,游艇管理者可根據(jù)不同海域游艇穩(wěn)性安全級別,確定游艇安全行駛的風(fēng)浪等級范圍。
[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.
【學(xué)位授予單位】：集美大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U661.32

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