The design of industrial fixed ratio gearboxes is a large subject in itself and wellbeyond the scope of the present work.However,it is important to recognize thatthe use of such gearboxes in wind turbines is a special application,because of theunusua

The design of industrial fixed ratio gearboxes is a large subject in itself and wellbeyond the scope of the present work.However,it is important to recognize thatthe use of such gearboxes in wind turbines is a special application,because of theunusua
The design of industrial fixed ratio gearboxes is a large subject in itself and well
beyond the scope of the present work.However,it is important to recognize that
the use of such gearboxes in wind turbines is a special application,because of the
unusual environment and load characteristics,and the sections which follow focus
on these aspects.Sections 7.4.2 to 7.4.6 consider variable loading,including drive
train dynamics and the impact of emergency braking loads,and examine how gear
fatigue design is adapted to take account of it.The relative benefits of parallel and
epicyclic shaft arrangements are discussed in Section 7.4.7,while subsequent
sections deal with noise reduction measures,and lubrication and cooling.A useful
reference is the American Gear Manufacturers Association Information Sheet (1996)
which covers the special requirements of wind turbine gearboxes in some detail.
7.4.2 Variable loads during operation
The torque level in a wind turbine gearbox will vary between zero and rated torque
according to the wind speed,with excursions above rated on fixed-speed pitchregulated
machines due to slow pitch response.The short-term torque fluctuations
will be subject to dynamic magnification to the extent that they excite drive train
resonances (see Section 7.4.3 below).In addition there will be occasional much
larger torques of short duration due to braking events,unless the brake is fitted to

The design of industrial fixed ratio gearboxes is a large subject in itself and wellbeyond the scope of the present work.However,it is important to recognize thatthe use of such gearboxes in wind turbines is a special application,because of theunusua
工业设计中的固定比例变速箱是一个大问题本身以及
范围以外的本工作.然而,重要的是要认识到,
使用这种变速箱在风力涡轮机是一种特殊的应用,因为
不寻常的环境和负荷特性,以及后续的重点章节,
在这些方面的问题.7.4.2到7.4.6节考虑变量载入中,包括驱动器
列车动力学和影响紧急制动负荷,并研究如何齿轮
疲劳设计适合考虑到它.相对利益的平行和
行星轴安排7.4.7节讨论,而随后的
部分处理降噪措施,润滑和冷却.一个有用的
参照美国齿轮制造商协会信息表（ 1996年）
其中包括特殊要求风力发电机组齿轮箱的一些细节.
7.4.2变负荷运行期间
扭矩级别的风力发电机组齿轮箱将之间零和额定扭矩
根据风速,游览上述评价与固定高速pitchregulated
机器由于慢垒反应.短期转矩波动
将受到动力放大的程度,他们兴奋传动系统
共振（见第7.4.3段） .此外还将有很多偶然
较大的扭矩短期由于制动活动,除非是安装制动