本文關鍵詞：風力發(fā)電機用特大型雙排四點接觸轉盤球軸承力學分析及優(yōu)化設計　出處：《河南科技大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 轉盤軸承 四點接觸球軸承 疲勞壽命 承載能力 優(yōu)化設計

【摘要】：特大型雙排四點接觸球軸承以其獨特的結構特點被廣泛用于風力發(fā)電機變槳系統(tǒng)中，其工作特性及可靠性直接影響整個風力發(fā)電機的正常運行。風力發(fā)電機特殊的使用環(huán)境要求變槳軸承具有長壽命、高可靠性及低摩擦力矩，，特大型雙排四點接觸球軸承的結構參數(shù)直接影響其載荷分布、壽命、承載能力及摩擦力矩。 基于赫茲接觸和摩擦學理論，對特大型雙排四點接觸球軸承力學性能、承載能力、疲勞壽命、油膜厚度、結構優(yōu)化、摩擦力矩進行了分析。并使用風電變槳軸承模擬試驗機進行了摩擦力矩的試驗驗證。首先根據(jù)特大型雙排四點接觸球軸承的結構特點及受載情況建立軸承的力學分析模型，使用ANSYS有限元分析軟件分析了特大型雙排四點接觸球軸承最大接觸應力，和數(shù)值計算結果進行了比較。根據(jù)Lundberg-Palmgren理論，給出了特大型雙排四點接觸球軸承疲勞壽命的計算方法。建立了特大型雙排四點接觸球軸承的摩擦力矩計算模型。并分析了軸承結構參數(shù)對特大型雙排四點接觸球軸承接觸載荷分布、最大接觸應力、疲勞壽命、承載能力、油膜厚度及摩擦力矩的影響。然后根據(jù)遺傳算法理論對軸承參數(shù)進行優(yōu)化。最后通過試驗值和計算結果對比，驗證力學模型及軸承摩擦力矩計算方法的正確性。 結果表明：軸承結構參數(shù)影響軸承接觸載荷分布、最大接觸應力、軸承承載承載能力、軸承疲勞壽命、軸承最小油膜厚度及軸承摩擦力矩。隨著軸承負游隙絕對值的增大，軸承最大接觸應力及最大接觸載荷先減小后增大；軸承原始接觸角增大，軸承最大接觸載荷及最大接觸應力減��；軸承接觸溝曲率半徑系數(shù)增大，軸承最大接觸載荷及最大接觸應力增大。有限元計算軸承接觸應力與數(shù)值計算方法進行比較，結果相差不大。軸承結構參數(shù)影響軸承承載能力，當軸承承受徑向力為0kN時，軸承游隙對軸承承載能力影響較��；隨著溝曲率半徑系數(shù)增大，承載能力減�。辉冀佑|角增大，軸承承載能力增大。隨著軸承承受徑向力增大，軸承游隙及軸承溝曲率半徑系數(shù)對軸承承載能力的影響趨勢相同。軸承原始接觸角對軸承承載能力的影響趨勢不同。隨著軸承負游隙絕對值的增大軸承疲勞壽命先增大后減小，摩擦力矩減小。隨著軸承溝曲率半徑系數(shù)的增大軸承疲勞壽命減小，摩擦力矩減小。隨著軸承負游隙絕對值、溝曲率半徑系數(shù)、原始接觸角增大，軸承最小油膜厚度先增大后減小。
[Abstract]:Super large double-row four-point contact ball bearings are widely used in wind turbine variable propeller system due to their unique structural characteristics. Its working characteristics and reliability directly affect the normal operation of the whole wind turbine. The special operating environment of the wind turbine requires long life, high reliability and low friction moment of the pitch bearing. The structural parameters of super large double row four point contact ball bearing have direct influence on its load distribution, life, bearing capacity and friction moment. Based on Hertz contact and tribology theory, the mechanical properties, bearing capacity, fatigue life, oil film thickness and structural optimization of super large double-row four-point contact ball bearings are optimized. The friction torque is analyzed, and the friction torque is verified by using wind power variable propeller bearing simulation test machine. Firstly, the mechanics of bearing is established according to the structure characteristic and load condition of super large double-row four-point contact ball bearing. Analytical model. The maximum contact stress of super large double-row four-point contact ball bearing is analyzed by using ANSYS finite element analysis software. The results are compared with the numerical results. According to the Lundberg-Palmgren theory. The calculation method of fatigue life of extra large double row four point contact ball bearing is given. The calculation model of friction moment of super large double row four point contact ball bearing is established. The bearing structure parameters are analyzed to the extra large double row four point contact bearing. Contact load distribution of ball bearings. The effects of maximum contact stress, fatigue life, bearing capacity, oil film thickness and friction torque on the bearing parameters are optimized based on genetic algorithm. Finally, the experimental results are compared with the calculated results. The correctness of the mechanical model and the calculation method of bearing friction moment is verified. The results show that the bearing structure parameters affect the bearing contact load distribution, maximum contact stress, bearing bearing capacity, bearing fatigue life. With the increase of the absolute value of negative clearance, the maximum contact stress and maximum contact load of bearing decrease first and then increase. With the increase of the original contact angle of the bearing, the maximum contact load and the maximum contact stress of the bearing decrease. The maximum contact load and maximum contact stress of the bearing are increased with the increase of the radius of curvature of the contact groove. The finite element method for calculating the contact stress of the bearing is compared with the numerical method. The results show that the bearing bearing capacity is influenced by bearing structural parameters, and when bearing bearing radial force is 0 KN, bearing clearance has little effect on bearing bearing capacity. With the increase of the radius of curvature, the bearing capacity decreases. The bearing bearing capacity increases with the increase of the original contact angle. The bearing bearing bearing clearance and radius of curvature coefficient influence trend is the same. Increase first, then decrease. With the increase of bearing groove radius coefficient, the fatigue life of bearing decreases, and the friction moment decreases. With the bearing negative clearance absolute value, groove curvature radius coefficient, the original contact angle increases. The minimum oil film thickness of bearing first increases and then decreases.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM315;TH133.3

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