在去年十二月份发布的的一份报告中，美国能源部估计电传动汽车和近海风力田的广泛使用，在2015年前可能导致这些金属元素的短缺。
In a report released last December, the U.S. Department of Energy estimated that widespread use of electric-drive vehicles and offshore wind farms could cause shortages of these metals by 2015.
在去年十二月份发布的的一份报告中，美国能源部估计电传动汽车和近海风力田的广泛使用，在2015年前可能导致这些金属元素的短缺。
In a report released last December, the U. S. Department of Energy estimated that widespread use of electric-drive vehicles and offshore wind farms could cause shortages of these metals by 2015.
随着兆瓦级风力发电机的开发，对其传动齿轮箱的设计可靠性要求越来越高。
With the megawatt class wind turbines being developed, the driving gearbox must have high reliability.
本文针对风力发电变桨距传动及控制系统进行了研究。
This paper studies virtual design of pitch Angle transmission and control system of wind turbine.
提供安装在自行车上的风扇及其传动机构，用于给骑车者提供风力和降温。
To provide the fan installed on the bicycle and its transmission mechanism, used to provide wind and temperature cycling.
采用了弹簧—质量—阻尼系统结构并按照风力机运行机理，建立了风力机传动系统的刚性轴模型和柔性轴模型，并确立了相应的仿真分析方法。
The rigid shaft model and flexible shaft model of the drive train based on the spring-mass-damper system are used to analyze the dynamics of the drive train.
因此研究风力发电机在变风速下的载荷特征及其对传动系统动力学行为的影响，对提高传动系统的可靠性具有十分重要的意义。
Because of the above reasons, the characteristic of the loads and the dynamic performances of the transmission system are very important for improving the reliability of transmission of wind turbine.
因此研究风力发电机在变风速下的载荷特征及其对传动系统动力学行为的影响，对提高传动系统的可靠性具有十分重要的意义。
Because of the above reasons, the characteristic of the loads and the dynamic performances of the transmission system are very important for improving the reliability of transmission of wind turbine.
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