共查询到20条相似文献,搜索用时 140 毫秒
1.
针对异步风力发电机转子及端部风扇进行了建模和动特性有限元分析计算.首先对风力发电机转子的运动方程进行了描述,说明了转子临界转速的理论定义.进而分别对转子和转子端部风扇建立了有限元模型,并采用分块兰索斯法对转子和风扇的前四阶固有频率和振型进行了求解,最后针对求解结果进行了分析,指出了误差决定因素.所述方法和所得结果对于风电运行人员具有参考价值. 相似文献
2.
3.
4.
5.
6.
7.
斜齿圆柱齿轮传动系统动力学模型及动特性试验研究 总被引:6,自引:0,他引:6
以一个带有原动机、工作机的斜齿轮传动系统为研究对象,同时考虑了电动机转子、各联轴器、斜齿轮副及发电机(工作机)转子等影响因素,并且引入了齿轮啮合传动时的变形协调条件,建立了一个多质量系统的动力学模型,研究了在各种不同条件下系统扭转振动、横向振动以及两者的耦合振动,并采用四阶Runge—Kutta法进行求解,得到了几个关于齿轮动力特性的影响规律,同时通过动特性试验对所建模型进行了验证。 相似文献
8.
9.
10.
11.
利用大型有限元计算软件ADiNA对某国产200MW汽轮发电机组转子-轴承系统的非线性动力学特性进行了初步分析。通过ADINA程序提供的用户接口将滑动轴承的非线性油膜力进行了考虑,计算中只计入了电机转子两端轴承的非线性影响。为了验证方法的有效性,以单盘柔性转子-轴承系统为对象,将计算结果与数值积分方法的结果进行了对比,表明该处理方法有很高的计算精度。最后,将对200MW机组转子-轴承系统的非线性动力学特性分析结果与线性分析结果也进行了比较,证明利用ADINA程序对大型机组转子-轴承系统的菲线性动力学特性进行分析是可行的。 相似文献
12.
从挠性转子的动平衡方程出发,以660 MW汽轮机转子为例,介绍了挠性转子的低速动平衡的原理与方法。 相似文献
13.
基于流固耦合的滑动轴承非线性油膜动特性研究 总被引:2,自引:0,他引:2
针对采用传统静态滑动轴承动力特性系数分析转子从启动到稳定在平衡位置这段时间内瞬态响应的误差较大的问题,提出了采用有限变分法和Newmark-β法相结合的非线性油膜动特性动态分析方法。该方法首先采用有限变分法计算非线性油膜动力特性系数, 解决了采用有限差分法时多次迭代的时效问题,大大提高了计算效率;然后根据计算得到的非线性油膜动力特性系数,通过Newmark-β法分析转子系统的瞬态响应,用学科间迭代方法实现了非线性油膜动力特性系数与转子瞬态响应之间的流固耦合;最后以Jeffcott转子系统为例,对比研究了传统静态分析方法与动态分析方法。结果证明,采用动态分析方法得到的转子系统瞬态响应幅值更小,精度更高。 相似文献
14.
15.
分析了某汽轮发电机组转子热态不平衡振动的动力学特征。介绍了利用热态质量平衡法消除振动的现场试验过程.为处理该类异常振动提供了有效的参考.作者简介: 相似文献
16.
17.
《Measurement》2016
The steam turbo-generator (TG) sets in power plants during the shutdown period often operate at a very low speed with the aid of barring gear. This low speed is known as the barring speed and it is of the order upto 100 RPM. The purpose is to float the rotor in the fluid bearings so that the rotor heavy self-weight should not cause any damage to the bearings. The barring speed also maintains uniformity of temperature across the complete rotor when cooling down from operating condition to normal condition. Operating at the barring speed is often considered as the machine is close to the stand still condition and may not be subjected to any harsh vibration problem. However the in-situ vibration measurement on a typical steam TG set during machine shutdown operating at the barring speed reveals that the machine is subjected to vibration which may have potential to propagate the existing damage further. The paper presents a typical industrial case study and observations. 相似文献
18.
19.
汽轮发电机的不平衡负载将使转子感应出两倍工频(100 Hz)的涡流,引起转子铁芯及其阻尼电路的发热,从而限制了发电机的负序能力。利用复数表面阻抗的概念给出了转子负序涡流场的分析方法。在此基础上,以转子极面加阻尼系统的300 MW汽轮发电机为例,计算了发电机稳态负序运行时转子上的涡流分布和损耗分布。根据计算结果,讨论了转子极面加阻尼系统对提高发电机负序能力所起的作用。 相似文献
20.
A novel nonlinear model of rotor/bearing/seal system based on the Hamilton principle is proposed for steam turbine systems in power plants. The Musznyska model and unsteady bearing oil-film force model were applied to describe the nonlinear steam excitation force and oil-film force. The Runge-Kutta method was used to solve the motion equation of the rotor/seal/bearing system. The dynamic characteristics of the rotor/bearing/seal system were analyzed with bifurcation diagrams, time-history diagrams, trajectory diagrams, Poincare maps and frequency spectrums. The numerical analysis indicates that the seal force and the oil-film force influence the nonlinear dynamic characteristics of the rotor system. With the increase of rotation speed, the rotor system exhibits rich forms of periodic, double-periodic, multi-periodic, quasi-periodic and chaotic motion. The combined impact of steam excitation force and bearing oil-film force may cause a severe vibration which seriously affects the safety and stability of the rotor. The presented model provides a theoretic foundation for further research on the ultra-supercritical steam turbines. 相似文献