本文選題：脈動風(fēng)　切入點：索塔式塔架　出處：《內(nèi)蒙古科技大學(xué)》2014年碩士論文

【摘要】：塔架是風(fēng)力發(fā)電機組的主要支撐裝置，確保其安全可靠尤為重要。目前國際風(fēng)電市場普遍采用錐臺型塔筒，然而隨著風(fēng)電機組日趨大型化，錐臺型塔筒性價比變低且運輸不便問題突顯，因此，研究新型塔架結(jié)構(gòu)具有重要的理論意義及工程實用價值。 本文以內(nèi)蒙古武川風(fēng)電場為背景，針對塔架風(fēng)荷載進行模擬，計算了塔架在脈動風(fēng)和穩(wěn)態(tài)風(fēng)作用下的風(fēng)振響應(yīng)，經(jīng)二者對比分析，選擇適用于索塔式塔架設(shè)計的合理風(fēng)荷載計算方法。此外，，以該風(fēng)場1.5MW風(fēng)電塔架為基礎(chǔ)，首先設(shè)計相同條件下的1.5MW索塔式風(fēng)力發(fā)電塔架，并采用ANSYS一階優(yōu)化方法對其進行優(yōu)化。最后對索塔式風(fēng)力發(fā)電塔架與錐臺型塔架進行綜合對比分析。 研究結(jié)果表明：采用線性濾波法模擬得到的風(fēng)速功率譜與目標(biāo)功率譜基本吻合，線性濾波法模擬風(fēng)荷載精確可行�；跁r程分析的塔架最大應(yīng)力和塔頂位移與按規(guī)范計算的結(jié)果相比，在額定工況下分別增大1.36倍和1.05倍，在暴風(fēng)工況下分別增大1.47倍和1.31倍，說明采用時程分析法計算風(fēng)荷載時塔架設(shè)計更安全，模擬得到的風(fēng)荷載能為索塔式塔架的設(shè)計提供依據(jù)。針對索塔式風(fēng)力發(fā)電塔架設(shè)計，拉索的優(yōu)化更為重要，當(dāng)拉索與地面夾角為35.2°、拉索高度為28.9m、拉索初張力為200kN時，拉索對減小塔底彎矩的貢獻最大；拉索對提高塔架剛度效果明顯，原錐筒式塔架外安裝拉索后塔頂位移減小40%，一階頻率增大19%。同時，通過優(yōu)化設(shè)計，鋼材強度利用率提高了36%且塔底直徑由4m減小至3.5m。索塔式塔架用鋼量相比錐臺型塔筒減少15%，基礎(chǔ)混凝土用量減少45%，材料造價降低20%。 本文索塔式風(fēng)力發(fā)電塔架設(shè)計及優(yōu)化的研究成果，可為大功率索塔式風(fēng)力發(fā)電塔架的設(shè)計及推廣提供科學(xué)依據(jù)。
[Abstract]:Tower is the main support device of wind turbine, so it is very important to ensure its safety and reliability. At present, conical tower is widely used in the international wind power market, but with the wind turbine becoming larger and larger, The ratio of performance to price of conical tower becomes low and the problem of inconvenient transportation is prominent. Therefore, it is of great theoretical significance and practical value to study the new tower structure. In this paper, based on the wind farm in Wuchuan, Inner Mongolia, the wind vibration response of the tower under pulsating wind and steady wind is calculated by simulating the wind load on the tower, and the wind vibration response of the tower under the action of pulsating wind and steady wind is calculated. A reasonable wind load calculation method suitable for the design of cable-tower tower is selected. In addition, based on the wind field 1.5MW wind tower, the 1.5MW cable-tower wind power tower under the same conditions is first designed. The first order optimization method of ANSYS is used to optimize the tower. Finally, a comprehensive comparative analysis between the cable tower tower and the cone tower is carried out. The results show that the wind speed power spectrum obtained by linear filtering method is in good agreement with the target power spectrum. The maximum stress and top displacement of the tower based on time-history analysis are 1.36 times and 1.05 times higher than those calculated according to the specifications, and 1.47 times and 1.31 times higher than those under the condition of storm wind, respectively, when the wind load is simulated by the linear filtering method, and the maximum stress and displacement of the tower based on the time-history analysis are increased by 1.36 times and 1.05 times respectively under rated working conditions. The results show that it is safer to calculate the wind load by time history analysis, and the simulated wind load can provide the basis for the design of cable-tower tower. The optimization of cable is more important for the design of cable-tower wind power tower. When the angle between cable and ground is 35.2 擄, the height of cable is 28.9 m, and the initial tension of cable is 200kN, the contribution of cable to reducing the bending moment of tower bottom is greatest, and the effect of cable on improving the stiffness of tower is obvious. The top displacement of the tower is reduced by 40% and the frequency of the first order is increased by 19% after the cable is installed outside the original cone tower. At the same time, by optimizing the design, The steel strength utilization ratio increased by 36% and the bottom diameter decreased from 4m to 3.5m.The steel content of cable tower tower decreased by 15%, the amount of foundation concrete was reduced by 45%, and the material cost was reduced by 20%. In this paper, the research results of the design and optimization of cable tower wind power tower can provide scientific basis for the design and popularization of high power cable tower wind power tower.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM614

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