海洋浮動式激光雷達(dá)測風(fēng)裝置初步研究
發(fā)布時間：2019-06-13 19:18
【摘要】：近年來為推動海上風(fēng)能的有效利用,海上風(fēng)場的建立越來越受到人們的重視。激光雷達(dá)因其探測精度與空間分辨率高、測量范圍遠(yuǎn)等特點(diǎn),已成為當(dāng)前測量海上風(fēng)場的最有效手段之一。目前,激光雷達(dá)大多安裝在固定樁柱上進(jìn)行測風(fēng)研究,隨著水深增加樁柱成本急劇增大,不利于長期發(fā)展。而浮動式激光雷達(dá)測風(fēng)裝置,因其制造成本低、布置方便以及污染小等優(yōu)點(diǎn),已經(jīng)越來越被人們所關(guān)注。本文自主設(shè)計(jì)了浮動式激光雷達(dá)測風(fēng)裝置,并基于三維勢流理論的SESAM軟件對其水動力性能展開了研究。論文的主要研究內(nèi)容及結(jié)論如下:(1)在大量調(diào)研各類型儀器的基礎(chǔ)上,通過對比分析,選擇了安裝簡便、測風(fēng)精度高的激光雷達(dá)以及相關(guān)配套設(shè)備,保證激光雷達(dá)能夠在海上進(jìn)行長期的測風(fēng)研究。(2)通過研究國內(nèi)外相關(guān)文獻(xiàn)和工程實(shí)例,利用SESAM軟件進(jìn)行數(shù)值模擬分析,確定了浮動式激光雷達(dá)測風(fēng)裝置的結(jié)構(gòu)型式、詳細(xì)尺寸以及相關(guān)設(shè)備布置方案,有效降低激光雷達(dá)工作時波浪對其測風(fēng)精度影響。分析可知:對于浮動式激光雷達(dá)測風(fēng)裝置內(nèi)部儀器的布置而言,將其靠近中垂線布置時,能夠有效地提高浮動式激光雷達(dá)測風(fēng)裝置的無因次衰減系數(shù),從而降低整個系統(tǒng)的運(yùn)動響應(yīng)幅值,但是浮動式激光雷達(dá)測風(fēng)裝置的固有周期也會隨著減小,可能對其工作產(chǎn)生不利影響。(3)應(yīng)用SESAM軟件的HydroD/Wadam模塊開展了浮動式激光雷達(dá)測風(fēng)裝置的頻域計(jì)算工作,得到不同波浪入射角、不同水深時的水動力系數(shù)。同時,進(jìn)一步考慮了粘性阻尼對浮動式激光雷達(dá)測風(fēng)裝置橫搖以及縱搖運(yùn)動的影響。結(jié)果表明:浮動式激光雷達(dá)測風(fēng)裝置的運(yùn)動性能與水深變化無關(guān),其橫搖與縱搖運(yùn)動固有周期約為2s,適合布放在長周期海域,而垂蕩運(yùn)動則具有良好的隨波運(yùn)動特性。此外,在進(jìn)行浮動式激光雷達(dá)測風(fēng)裝置運(yùn)動響應(yīng)預(yù)報時,建議考慮粘性阻尼作用,否則計(jì)算結(jié)果偏大。(4)依據(jù)不同的工作水深,為浮動式激光雷達(dá)測風(fēng)裝置設(shè)計(jì)了兩種系泊系統(tǒng),分別是:全錨鏈系泊系統(tǒng)和三段式系泊系統(tǒng),并應(yīng)用SESAM軟件的DeepC模塊對浮動式激光雷達(dá)測風(fēng)裝置及其系泊系統(tǒng)進(jìn)行時域計(jì)算分析,驗(yàn)證可行性。其結(jié)果表明:當(dāng)浮動式激光雷達(dá)測風(fēng)裝置采用全錨鏈系泊系統(tǒng)時,想要控制其運(yùn)動響應(yīng)和錨鏈張力,應(yīng)著重控制浮動式激光雷達(dá)測風(fēng)裝置的波頻運(yùn)動成分。而采用三段式系泊系統(tǒng)時,則既需要控制浮動式激光雷達(dá)測風(fēng)裝置波頻運(yùn)動成分還需要重點(diǎn)考慮低頻運(yùn)動成分。(5)根據(jù)相似理論,確定模型參數(shù),通過模型規(guī)則波試驗(yàn)驗(yàn)證浮動式激光雷達(dá)測風(fēng)裝置的數(shù)值理論結(jié)果。
[Abstract]:In recent years, in order to promote the effective utilization of offshore wind energy, the establishment of offshore wind field has been paid more and more attention. Lidar has become one of the most effective means to measure offshore wind field because of its high detection accuracy, spatial resolution and long measurement range. At present, lidar is mostly installed on fixed piles for wind measurement research. with the increase of water depth, the cost of piles increases sharply, which is not conducive to long-term development. Floating lidar wind measuring device has been paid more and more attention because of its low manufacturing cost, convenient arrangement and low pollution. In this paper, a floating lidar wind measuring device is designed independently, and its hydrodynamic performance is studied based on SESAM software of three-dimensional potential flow theory. The main research contents and conclusions of this paper are as follows: (1) on the basis of a large number of investigation and analysis of various types of instruments, through comparative analysis, the lidar with simple installation and high accuracy of wind measurement and related supporting equipment is selected to ensure that lidar can carry out long-term wind measurement research at sea. (2) by studying the relevant literature and engineering examples at home and abroad, the numerical simulation analysis is carried out by using SESAM software. The structure type, detailed size and arrangement scheme of the floating lidar wind measuring device are determined, which can effectively reduce the influence of the wave on the wind measuring accuracy of the lidar when it works. The analysis shows that for the arrangement of the internal instruments of the floating lidar wind measuring device, when it is close to the vertical line, the dimensionless attenuation coefficient of the floating lidar wind measuring device can be effectively improved, thus reducing the amplitude of the motion response of the whole system, but the inherent period of the floating lidar wind measuring device will also decrease. It may have adverse effects on its work. (3) the frequency domain calculation of floating lidar wind measuring device is carried out by using the HydroD/Wadam module of SESAM software, and the hydrodynamic coefficients of different wave incident angles and different water depths are obtained. At the same time, the influence of viscous damping on rolling and pitching motion of floating lidar wind measuring device is further considered. The results show that the motion performance of the floating lidar wind measuring device has nothing to do with the change of water depth. The inherent period of rolling and pitching motion is about 2s, which is suitable for distribution in the long period sea area, while the drooping motion has good wave motion characteristics. In addition, when predicting the motion response of floating lidar wind measuring device, it is suggested that viscous damping should be considered, otherwise the calculation results are too large. (4) according to different working water depths, two kinds of mooring systems are designed for floating lidar wind measuring device, namely, full anchor chain mooring system and three-stage mooring system. The DeepC module of SESAM software is used to calculate and analyze the floating lidar wind measuring device and its mooring system in time domain, and the feasibility is verified. The results show that when the full anchor chain mooring system is used in the floating lidar wind measuring device, in order to control its motion response and anchor chain tension, the wave frequency motion components of the floating lidar wind measuring device should be controlled. When the three-stage mooring system is used, it is not only necessary to control the wave frequency motion components of the floating lidar wind measuring device, but also to consider the low frequency motion components. (5) according to the similarity theory, the model parameters are determined, and the numerical theoretical results of the floating lidar wind measuring device are verified by the model regular wave test.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN958.98
本文編號：2498754
[Abstract]:In recent years, in order to promote the effective utilization of offshore wind energy, the establishment of offshore wind field has been paid more and more attention. Lidar has become one of the most effective means to measure offshore wind field because of its high detection accuracy, spatial resolution and long measurement range. At present, lidar is mostly installed on fixed piles for wind measurement research. with the increase of water depth, the cost of piles increases sharply, which is not conducive to long-term development. Floating lidar wind measuring device has been paid more and more attention because of its low manufacturing cost, convenient arrangement and low pollution. In this paper, a floating lidar wind measuring device is designed independently, and its hydrodynamic performance is studied based on SESAM software of three-dimensional potential flow theory. The main research contents and conclusions of this paper are as follows: (1) on the basis of a large number of investigation and analysis of various types of instruments, through comparative analysis, the lidar with simple installation and high accuracy of wind measurement and related supporting equipment is selected to ensure that lidar can carry out long-term wind measurement research at sea. (2) by studying the relevant literature and engineering examples at home and abroad, the numerical simulation analysis is carried out by using SESAM software. The structure type, detailed size and arrangement scheme of the floating lidar wind measuring device are determined, which can effectively reduce the influence of the wave on the wind measuring accuracy of the lidar when it works. The analysis shows that for the arrangement of the internal instruments of the floating lidar wind measuring device, when it is close to the vertical line, the dimensionless attenuation coefficient of the floating lidar wind measuring device can be effectively improved, thus reducing the amplitude of the motion response of the whole system, but the inherent period of the floating lidar wind measuring device will also decrease. It may have adverse effects on its work. (3) the frequency domain calculation of floating lidar wind measuring device is carried out by using the HydroD/Wadam module of SESAM software, and the hydrodynamic coefficients of different wave incident angles and different water depths are obtained. At the same time, the influence of viscous damping on rolling and pitching motion of floating lidar wind measuring device is further considered. The results show that the motion performance of the floating lidar wind measuring device has nothing to do with the change of water depth. The inherent period of rolling and pitching motion is about 2s, which is suitable for distribution in the long period sea area, while the drooping motion has good wave motion characteristics. In addition, when predicting the motion response of floating lidar wind measuring device, it is suggested that viscous damping should be considered, otherwise the calculation results are too large. (4) according to different working water depths, two kinds of mooring systems are designed for floating lidar wind measuring device, namely, full anchor chain mooring system and three-stage mooring system. The DeepC module of SESAM software is used to calculate and analyze the floating lidar wind measuring device and its mooring system in time domain, and the feasibility is verified. The results show that when the full anchor chain mooring system is used in the floating lidar wind measuring device, in order to control its motion response and anchor chain tension, the wave frequency motion components of the floating lidar wind measuring device should be controlled. When the three-stage mooring system is used, it is not only necessary to control the wave frequency motion components of the floating lidar wind measuring device, but also to consider the low frequency motion components. (5) according to the similarity theory, the model parameters are determined, and the numerical theoretical results of the floating lidar wind measuring device are verified by the model regular wave test.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN958.98
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