共查询到20条相似文献,搜索用时 62 毫秒
1.
风力发电机轮毂的制造工艺难度较大.文中通过对其结构特点的分析,优化加工工艺方案,利用先进的检验设备配合数控加工,确保了轮毂加工精度. 相似文献
2.
3.
轴承是支撑轴转动的重要部件,其使用寿命关系着整个机器的运行安全。依据某2MW风力机传动系统中低速轴为例,通过BLADED软件分析出的60s载荷图,根据疲劳损伤累积原理和雨流计数方法,绘制出风力机主轴载荷谱,并根据行星轮传动原理和理论力学等基本知识得出低速轴载荷谱。采用圆柱滚子轴承NU0000型为算例,由载荷谱计算出轴承寿命,选用一般轴承寿命计算和SKF轴承寿命公式计算两种方法分别计算。其结果表明轴承的寿命满足要求,并且可以用于一般轴承的寿命计算方法。为以后风力发电机研究和相关机械的设计提供理论依据。 相似文献
4.
5.
6.
《机械设计与制造》2013,(9)
有限元就是用具有一定大小的单元对原来连续的物体力学模型进行离散。这些单元仅在为数不多的节点上相连接,然后将等效力代替实际作用于单元的外力并施加在节点上。为每个单元选择一个能够表示单元位移分布规律的形函数,根据弹性力学理论中的变分原理建立单元节点力和位移之间的方程。最后把这种所有的单元联立起来组成方程组(以节点位移为未知量),最后解这些方程组。对风力发电机的增速箱中行星架和输出齿轮轴进行了有限元分析,将建立的限元模型的部件进行静态强度分析,得出行星架、齿轮轴轴在载荷下的应力分布规律和位移分布规律。利用有限元动力学分析理论,对齿轮轴进行模态分析,确定各部件的固有频率、相应振型和承受动态载荷结构设计中的重要参数。在最后,通过有限元分析软件ANSYS的优化功能,对行星架进行拓扑优化,为行星架的进一步优化设计提供了依据。 相似文献
7.
8.
9.
10.
基于三维软件Pro-E,建立了1.5MW风力发电机行星轮系传动系统模型,并导入ADAMS进行刚体动力学仿真,通过接触力比较得知太阳轮易受损,通过ANSYS模态分析,得到其前十阶固有频率,为今后齿轮箱动态特性研究提供数据基础. 相似文献
11.
12.
13.
A novel design optimization model for placing frequencies of a wind turbine tower/nacelle/rotor structure in free yawing motion is developed and discussed. The main aim is to avoid large amplitudes caused by the yawing-induced vibrations in the case of horizontal-axis wind turbines or rotational motion of the blades about the tower axis in case of vertical-axis wind turbines. This can be a major cause of fatigue failure and might severely damage the whole tower/nacelle/rotor structure. The mathematical formulation considers a single pole tower configuration having thin-walled circular cross section with constant taper along the tower height. The nacelle/rotor combination is modeled as a rigid mass elastically supported at the top of the tower by the torsional spring of the yawing mechanism. Adequate scaling and non-dimensionalization of the various parameters and variables are given in order to make the model valid for a variety of wind turbine configurations and types of the material of construction. The resulting governing differential equation of motion is solved analytically by transforming it into a standard form of Bessel's equation, which leads to the necessary exact solutions for the frequencies and mode shapes. Several cases of study are examined for different values of the yawing stiffness and inertia parameters by considering both conditions of locked and unlocked yawing mechanism. Useful design charts are developed for placing the frequencies at their needed target values with no penalty of increasing the total structural weight of the system. In all, the developed model guarantees full separation of the system frequencies from the critical exciting yawing frequencies by proper choice of the optimization design parameters. 相似文献
14.
15.
16.
采用两轴加载(翼面向共振)方式实现兆瓦级风电叶片疲劳寿命检测,并就关键部件——翼面向加载装置和翼弦向加载装置之间的运动耦合问题进行分析.对翼弦向加载机构的设计与分析,采用协调曲线法,利用MATLAB优化工具箱实现机构多目标函数的优化,得到翼弦向加载机构优化的偏心距、杆长及位移曲线,并得到同频和异频条件下叶片的运动轨迹.为后续的动力学分析、液压系统及控制系统设计等提供必要的理论分析基础,同时,也为该技术的实际工程应用提供理论依据. 相似文献
17.
大型风力发电机的叶片几乎都是复合材料加工而成,由于各种原因,叶片在加工过程可能会出现各种质量问题。以1.5MW根部T型螺栓孔打孔损伤叶片为例,应用ANSYS软件建立了叶片根部与T型螺栓的有限元模型。对其根部和T型连接螺栓进行了受力分析,并分别比较了正常结构和损伤结构两种情况下叶片根部T型螺栓孔和螺栓的应力。计算结果表明,叶片根部缺陷孔应力还处在可接受范围内,对T型螺栓的受力也影响不大,受损叶片可通过进一步补强后正常使用。 相似文献
18.
19.
20.
Blade number effect for a ducted wind turbine 总被引:1,自引:0,他引:1
Sheng-Huan Wang Shih-Hsiung Chen 《Journal of Mechanical Science and Technology》2008,22(10):1984-1992
Ducted wind turbine with multiple blades installed was believed to have a good wind power energy conversion effect. However,
little information was available on how to design a good ducted wind turbine. In this paper the effects of blade number on
a ducted wind turbine performance is studied. Numerical studies using CFD method to simulate the wind turbine performance
were adopted. The duct is a converging-diverging nozzle with the turbine blades located at the throat. A rated output of a
1-kW turbine is adopted as the baseline design. It was found that the blade geometry, stagger angle, and number of blades
have different duct blockage effects, and do affect the turbine performance (specifically the power coefficient and torque
coefficient, etc.). The fewer number of blades has higher through flow speed, while the larger number of blades provides larger
torque. The best power coefficient lies in between the two extremes. The appropriate number of blades is important to match
the generator performance curve for optimal overall performance and efficiency.
This paper was presented at the 9th Asian International Conference on Fluid Machinery (AICFM9), Jeju Korea, October 16–19, 2007. 相似文献