發(fā)布時(shí)間：2018-07-07 14:26

  本文選題：透空結(jié)構(gòu) + 漂浮圓筒��； 參考：《工程力學(xué)》2017年12期

【摘要】：基于線(xiàn)性勢(shì)流理論,應(yīng)用特征函數(shù)展開(kāi)方法和透空壁內(nèi)流體速度與兩壁間壓力差成正比的線(xiàn)性模型,建立了上部帶有透空結(jié)構(gòu)的截?cái)鄨A筒繞射問(wèn)題和輻射問(wèn)題的解析模型,進(jìn)而導(dǎo)出浮體的垂蕩運(yùn)動(dòng)響應(yīng)幅值算子計(jì)算公式。通過(guò)與直立透空?qǐng)A筒和非透空截?cái)鄨A柱的相關(guān)結(jié)果進(jìn)行對(duì)比,驗(yàn)證了該文推導(dǎo)的正確性。通過(guò)數(shù)值計(jì)算研究了透空系數(shù)、圓筒內(nèi)外徑比(內(nèi)圓柱半徑和圓筒半徑之比)和吃水比(透空結(jié)構(gòu)吃水和圓筒吃水之比)對(duì)整個(gè)圓筒的垂向水動(dòng)力特性(運(yùn)動(dòng)響應(yīng)幅值、附加質(zhì)量、輻射阻尼和波浪激振力)的影響,并與非透空截?cái)鄨A柱的計(jì)算結(jié)果進(jìn)行對(duì)比分析。結(jié)果表明隨著透空系數(shù)的增大,結(jié)構(gòu)的附加質(zhì)量和輻射阻尼呈增加趨勢(shì),垂蕩運(yùn)動(dòng)響應(yīng)幅值算子的峰值呈明顯減小趨勢(shì),并且在低頻區(qū)垂向波浪激振力相對(duì)較小,這有利于增加浮式結(jié)構(gòu)的穩(wěn)定性;內(nèi)外徑比和吃水比均對(duì)透空結(jié)構(gòu)的垂向水動(dòng)力特性影響較大。
[Abstract]:Based on the theory of linear potential flow, the analytical model of truncated cylinder diffraction problem and radiation problem is established by using the eigenfunction expansion method and the linear model in which the velocity of the fluid in the perforated wall is proportional to the pressure difference between the two walls. Furthermore, the formula for calculating the amplitude operator of the response of floating body is derived. The correctness of the proposed method is verified by comparing the results with the vertical perforated cylinder and the non-permeable truncated cylinder. The vertical hydrodynamic characteristics (the amplitude of motion response) of the whole cylinder are studied by numerical calculation of the permeability coefficient, the ratio of the inner and outer diameter of the cylinder (the ratio of the inner cylinder radius to the cylinder radius) and the draught ratio (the draught ratio of the permeable structure to the cylinder draft). The effects of additional mass, radiation damping and wave excitation force are compared with the calculated results of an impermeable truncated cylinder. The results show that the additional mass and radiation damping of the structure increase with the increase of the permeability coefficient, and the peak value of the response amplitude operator of the vertical motion decreases obviously, and the vertical wave excitation force is relatively small in the low frequency region. It is beneficial to increase the stability of floating structure, and the ratio of internal and external diameter and draft water have great influence on the vertical hydrodynamic characteristics of the porous structure.
【作者單位】： 大連理工大學(xué)海岸和近海工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;大連理工大學(xué)海洋與科學(xué)技術(shù)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51379037,51679036) 教育部新世紀(jì)優(yōu)秀人才計(jì)劃項(xiàng)目(NCET-13-0076)
【分類(lèi)號(hào)】：P731.22;P75

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