共查询到19条相似文献,搜索用时 546 毫秒
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对电动增压器用低比转速离心压气机轮毂轮缘进行优化设计。采用NUMECA/FINE Design 3D对压气机进行几何参数化,生成数据库样本,利用人工神经网络和遗传算法对轮毂轮缘型线进行优化,并进行流场分析。仿真结果表明,在设计转速为40000 r/min时,优化后设计点压比和效率分别提高6.59%和3.73%。 相似文献
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轮毂组件是风电机组的核心旋转部件,保证轮毂组件的静平衡是保证风电机组平稳运行的重要方面。通过运用理论力学原理对轮毂组件的静平衡进行了力学分析,推导出了计算公式并编制了EXCEL配平程序,实现了轮毂组件配平的自动分析、计算,进而分析了影响轮毂组件配平的因素及实际配平过程中的注意事项,以供设计人员在设计配平工装及程序时参考。 相似文献
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通过对以往拉线地锚设计方法的分析,研究了输电线路拉线地锚结构优化设计的方法。在满足拉线基础上拔稳定性的前提下,考虑到经济因素,利用MATLAB自行编制拉线地锚结构优化程序,对输电线路拉线地锚的结构进行了优化设计研究与分析。最后将提出的优化设计方法与相应规范进行了对比,其优化结果与规范吻合较好,说明该优化方法是实用、可靠的。文中的结论将为拉线地锚结构的制备及设计方法提供理论依据和技术支持。 相似文献
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大型风力发电机组轮毂强度数值分析 总被引:1,自引:0,他引:1
文章基于德国劳埃德(GL)认证规范,对某1.5MW风力发电机组的轮毂做了强度及疲劳分析。通过计算分析,找到了轮毂在各种工况下的应力分布规律和疲劳影响因素。从而获得了风力发电机组关键零部件设计与分析的方法。 相似文献
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A typical 1.5 MW wind turbine suitable for Xuzhou City is designed and simulated in this paper. The wind turbine blade-hub-tower coupling system and most of the parameters are designed and calculated in the design process. In the kinetic analysis process, the force analysis under 4 different situations are taken to verify the structure design, which are under quiescent condition, under random angle and random wind turbine, under maximal wind speed and over maximal wind speed. At last, the modal analysis selected the turbine hub and tower to solve the inherent frequencies and vibration modes. The first 5 order inherent frequencies and vibration modes of the hub and tower are solved to verify the design rationality. 相似文献
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Using output from a high‐resolution meteorological simulation, we evaluate the sensitivity of southern California wind energy generation to variations in key characteristics of current wind turbines. These characteristics include hub height, rotor diameter and rated power, and depend on turbine make and model. They shape the turbine's power curve and thus have large implications for the energy generation capacity of wind farms. For each characteristic, we find complex and substantial geographical variations in the sensitivity of energy generation. However, the sensitivity associated with each characteristic can be predicted by a single corresponding climate statistic, greatly simplifying understanding of the relationship between climate and turbine optimization for energy production. In the case of the sensitivity to rotor diameter, the change in energy output per unit change in rotor diameter at any location is directly proportional to the weighted average wind speed between the cut‐in speed and the rated speed. The sensitivity to rated power variations is likewise captured by the percent of the wind speed distribution between the turbines rated and cut‐out speeds. Finally, the sensitivity to hub height is proportional to lower atmospheric wind shear. Using a wind turbine component cost model, we also evaluate energy output increase per dollar investment in each turbine characteristic. We find that rotor diameter increases typically provide a much larger wind energy boost per dollar invested, although there are some zones where investment in the other two characteristics is competitive. Our study underscores the need for joint analysis of regional climate, turbine engineering and economic modeling to optimize wind energy production. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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The load reduction potential in regular operation and the design drivers of a flexible hub connection on two‐bladed turbines are presented in this paper. Developed for the two‐bladed Skywind 3.4 MW wind turbine, the flexible hub connection integrates an additional, multidirectional elasticity between the hub mount and the nacelle carrier to reduce the load transfer into the support structure. The stiffness and damping properties of the interface connection determine the load amplitudes of the system and influence the overall turbine dynamics. Consequently, the design relevant operating scenarios change due to a potential dynamic instability, resonance, or violation of deflection margins in comparison with a nonflexible hub connection. The system's capability to reduce fatigue and ultimate loads is assessed in several turbulent inflow conditions and transient operating states, while taking into account the operating limits of displacements. A permutation of the dynamic coupling parameters is conducted to characterize the sensitivity of load characteristics to the design variables. By identifying the critical operating conditions, it is possible to provide design guidelines for an effective optimization strategy. 相似文献
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[目的]针对某型永磁直驱风力发电机组机舱几何外形不规则,受载荷复杂、重量较大的情况,需对其进行优化分析与设计。[方法]基于有限元方法,建立了机舱的有限元模型,分析了弯头形机舱的几何结构和主要形状影响参数,并基于分析结果对参数进行优化调整与复核计算。[结果]优化后的机舱最大von Mises应力由181 MPa减小到173 MPa,应力降低了4.4%,满足强度要求,重量由52.7 t减小到45.2 t,重量减少了约14.2%。[结论]研究表明,优化效果明显,为风电机组此类机舱设计与优化方法提供了借鉴和参考。 相似文献
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风电机组塔筒结构的薄弱处是门洞,门洞设计的好坏将直接影响到塔筒整体的可靠性。借助CAE工具ANSYS Workbench对大型风电机组塔筒门洞进行参数化建模,并将决定门洞形状的3个参数(椭圆长轴RMX16、短轴RMN18和直边H21)作为输入参数,von mises应力作为输出参数,设优化目标为应力最小,得到优化后门洞形状为椭圆形。实践证明,利用结构优化设计的理念,对塔筒门洞进行形状参数优化,可以求得最优塔筒门洞形状,用以提升塔筒的可靠性。与常规结构设计方法相比,采用优化设计方法,显著提高了设计效率、设计品质,而且节约了设计成本,可以在风电机组的产品设计中推广应用。 相似文献
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Wind farms are generally designed with turbines of all the same hub height. If wind farms were designed with turbines of different hub heights, wake interference between turbines could be reduced, lowering the cost of energy (COE). This paper demonstrates a method to optimize onshore wind farms with two different hub heights using exact, analytic gradients. Gradient‐based optimization with exact gradients scales well with large problems and is preferable in this application over gradient‐free methods. Our model consisted of the following: a version of the FLOw Redirection and Induction in Steady‐State wake model that accommodated three‐dimensional wakes and calculated annual energy production, a wind farm cost model, and a tower structural model, which provided constraints during optimization. Structural constraints were important to keep tower heights realistic and account for additional mass required from taller towers and higher wind speeds. We optimized several wind farms with tower height, diameter, and shell thickness as coupled design variables. Our results indicate that wind farms with small rotors, low wind shear, and closely spaced turbines can benefit from having two different hub heights. A nine‐by‐nine grid wind farm with 70‐meter rotor diameters and a wind shear exponent of 0.08 realized a 4.9% reduction in COE by using two different tower sizes. If the turbine spacing was reduced to 3 diameters, the reduction in COE decreased further to 11.2%. Allowing for more than two different turbine heights is only slightly more beneficial than two heights and is likely not worth the added complexity. 相似文献
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Aerodynamic shape optimization of wind turbine blades using a Reynolds‐averaged Navier–Stokes model and an adjoint method 下载免费PDF全文
Computational fluid dynamics (CFD) is increasingly used to analyze wind turbines, and the next logical step is to develop CFD‐based optimization to enable further gains in performance and reduce model uncertainties. We present an aerodynamic shape optimization framework consisting of a Reynolds‐averaged Navier Stokes solver coupled to a numerical optimization algorithm, a geometry modeler, and a mesh perturbation algorithm. To efficiently handle the large number of design variables, we use a gradient‐based optimization technique together with an adjoint method for computing the gradients of the torque coefficient with respect to the design variables. To demonstrate the effectiveness of the proposed approach, we maximize the torque of the NREL VI wind turbine blade with respect to pitch, twist, and airfoil shape design variables while constraining the blade thickness. We present a series of optimization cases with increasing number of variables, both for a single wind speed and for multiple wind speeds. For the optimization at a single wind speed performed with respect to all the design variables (1 pitch, 11 twist, and 240 airfoil shape variables), the torque coefficient increased by 22.4% relative to the NREL VI design. For the multiple‐speed optimization, the torque increased by an average of 22.1%. Depending on the CFD mesh size and number of design variables, the optimization time ranges from 2 to 24h when using 256 cores, which means that wind turbine designers can use this process routinely. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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Developement and verification of a performance based optimal design software for wind turbine blades
In this research, we developed software for designing the optimum shape of multi-MW wind turbine blades and analyzing the performance, and it features aerodynamic shape design, performance analysis, pitch–torque analysis and shape optimization for wind turbine blades. In order to verify the accuracy of the performance analysis results of the software developed in this research, we chose the 5 MW blade, designed by NREL, as the comparison model and compared with the analysis results of well known commercial software (GH-Bladed). The calculated performance analysis results of GH-Bladed and our software were consistent in all values of CP in all λ ranges. Also, to confirm applicability of the optimum design module, the optimum design of the new 5 MW blade was performed using the initial design data of the comparison model and found that solidity was smaller in our design even though it produced the same output and efficiency. Through optimization of blade design, efficiency increased by 1% while the thrust coefficient decreased by 7.5%. 相似文献