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The calculation of the rotordynamic coefficients of a multistepped annular seal in hydraulic turbines is discussed in this paper. Based on the Hirs' turbulence lubrication theory and the bulk flow model, the governing equations for the flow in the seal are developed by using the Moody's friction equations. The governing equations are perturbed when the rotor and the stator are coaxial. The Runge Kutta integration method and the Newton Raphson iteration method are used to solve the perturbation equations....

本文首先在Hirs紊流润滑理论的基础上,采用体积流动模型及Moody摩擦方程建立起阶梯口环水封中流体流动的控制方程,将各个方程在转子与定子同心处进行摄动,采用Runge-Kuta积分法及迭代过程求解摄动方程,建立起水轮机阶梯式口环水封的转子动力特性系数的计算方法,为水轮发电机组轴系的动力学分析提供了必要的理论基础。

Single chip ; Power unit ; AC sampling ; Hardware synchronous sampling

单片机;发电机组;交流采样;硬件同步采样

Sandwich board is applied in wind turbine act as blades , canopy housing and rotor hoods

蜂窝板是应用于风力发电机组作为刀片,林冠住房和转子头套

The self-excitation criterion of single-machine is difficult to apply to multi-machine power system, so the mathematical model to judge the self-excitation of all generating sets in multi-machine power system is researched.

1引言随着同步发电机组单机容量的增大和远距离负荷中心电站的建设,以及电力系统容量、电压和输电距离的不断发展和提高,许多问题随之产生,同步发电机的自励磁问题就是其中之一。

As shown in some papers the self-excited vibrations are major reasons of causing serious damage to the rotating machinery.

有关资料表明,汽轮发电机组的重大事故的诱因中轴系振动已远远超过转子裂纹,其中自激振动和扭振引起的故障占绝大多数。

The deHavilland Mk III Turbo Beaver, when compared to the standard Beaver, has a turbine powered engine that carries additional passengers, climbs and cruises faster, and has a higher service ceiling.

该dehavilland旺角三,汽轮发电机组的河狸,当相比,标准的河狸,有一个涡轮动力引擎,进行额外的乘客,爬升和游船的速度更快,具有较高的服务的上限。

The suggestion on grounding of the standby generator set and transfer switch selection is put forward.

最后提出了关于备用发电机组接地和转换开关选择的建议。

Take the M701F gas turbine for example , and useAspen Plus software to simulate the gas turbine simple cycle system.

并以M701F型燃气轮机发电机组作为研究对象,利用Aspen Plus软件对该燃气轮机简单循环系统进行模拟。

It is believed to launch large scale of monitoring on large scale of turbine generator set,failure diagnosis method and new technology research,which exercise significant impacts on maintaining the operational quality and the safety for the sophistical turbine generator equipment.

深入开展大型汽轮发电机组状态监测与故障诊断新方法与新技术的研究,对于保障这类大型复杂设备的安全可靠运行具有重要意义。

With the main protection designs of six hydro-generators in Baise, Letan, Fengtan, Wawushan, Pengshui and Laxiwa power stations as example, the design process of hydro-generators with odd branches can be reduced to the main protection design of hydro-generators with three branches per phase and the usage of incomplete split-phase transverse differential protection is becoming significant.

0引言随着三峡、龙滩、拉西瓦等工程的相继建设,国内的水电建设已进入又一个发展高潮,水电机组正向着大型和超大型方向发展[1];大型水轮发电机主保护配置方案的定量化设计已逐步被电厂和设计院所接受,从而为大型发电机组的安全运行提供了高质量的保证[2-6]。

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推荐网络例句

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。