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】：基于線性勢流理論,應(yīng)用特征函數(shù)展開方法和透空壁內(nèi)流體速度與兩壁間壓力差成正比的線性模型,建立了上部帶有透空結(jié)構(gòu)的截斷圓筒繞射問題和輻射問題的解析模型,進(jìn)而導(dǎo)出浮體的垂蕩運動響應(yīng)幅值算子計算公式。通過與直立透空圓筒和非透空截斷圓柱的相關(guān)結(jié)果進(jìn)行對比,驗證了該文推導(dǎo)的正確性。通過數(shù)值計算研究了透空系數(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)對整個圓筒的垂向水動力特性(運動響應(yīng)幅值、附加質(zhì)量、輻射阻尼和波浪激振力)的影響,并與非透空截斷圓柱的計算結(jié)果進(jìn)行對比分析。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,垂蕩運動響應(yīng)幅值算子的峰值呈明顯減小趨勢,并且在低頻區(qū)垂向波浪激振力相對較小,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透空結(jié)構(gòu)的垂向水動力特性影響較大。
[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)海岸和近海工程國家重點實驗室;大連理工大學(xué)海洋與科學(xué)技術(shù)學(xué)院;
【基金】：國家自然科學(xué)基金項目(51379037,51679036) 教育部新世紀(jì)優(yōu)秀人才計劃項目(NCET-13-0076)
【分類號】：P731.22;P75

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