基于导叶可调液力变矩器风电机组的设计

基于导叶可调式液力变矩器,综合考虑风轮转速、发电机功率、液力变矩器结构参数,设计出适应于变化的风轮转速,并能使发电机输入转速保持恒定的风电机组.     

基于功率分流原理液力变矩器的改进及其传动基础特性研究

为有效地降低传动系统对变速元件的性能要求和提高动力变速传动系统的高效传动效率,在传统液力变矩器的基础上,拟配置行星齿轮机构作为分流式液力机械变速器的变速器件,通过对分流式液力传动系统的结构分析,结合具代表性的速比、效率以及负荷特性的理论分析,研究分流式传动系统基础特性的响应。结果表明,添加行星齿轮系的分流式传动系统的调速范围要比液力变矩器大的多;在液力变矩器工作的高效率速比区域,分流传动的效率始终优于液力变矩器传动;利用分流式传动系统可扩展系统工作区域、分散系统负荷特性、增强系统传递特性。充分验证该类型分流式传动系统开发的必要性。     

液力变矩器的维护保养

液力变矩器最常见的故障,一是功率不足,二是温度过高。由液力变矩器的特性曲线图可知,当变矩器的输出转矩即涡轮转矩随着外界阻力变化而变化,外界阻力增大时,变矩器的输出转矩也增大,涡轮转速降低。当输出转矩增大到一定值时,涡轮转速降为零,而此时变矩器的输入转矩仍然不变,也就是说发动机的负荷并未改变。因此,当外界阻力大到一定值后,变矩器的输出转矩(涡轮转矩)达到最大值,而涡轮转速为零,机器行驶速度也为零,而发动机却既不冒黑烟又不降速,     

用于低速从动机械的液力行星齿轮复合传动装置

该文介绍一类用于低速从动工作机械调速驱动的高效液力行星齿轮复合传动装置,其工作基于功率分流原理,在较宽的负载率变化范围内可以保持较高的传动效率。通过对传动系统运动学及转矩平衡关系的分析,推导了液力元件分流功率的比例及液力行星齿轮的总体机械传动效率与液力元件转速比、原始特性参数、差动轮系结构参数的关系,初步探讨了系统结构参数的求解思路,对液力变矩器的选型、结构参数的确定做了一定的实用分析,为此类液力机械装置进一步的研究与开发提供参考与借鉴。     

轮式装载机液力变矩器与发动机匹配分析计算

根据变矩器泵轮输入与涡轮输出之间的关系及泵轮的吸收扭矩的计算原理,运用差值的方法绘制出发动机的外特性曲线及变矩器泵轮吸收扭矩曲线族,求解出曲线之间的交点,最后计算出液力变矩器涡轮输出扭矩及转速,为后续整机行驶动力特性计算提供了关键数据基础。     

行星齿轮功率分流式无级变速器的设计研究

针对液力自动变速器传动效率低、油耗大、结构复杂的缺陷,提出了一种新型的行星齿轮功率分流式无级变速器,它取消了液力变矩器,在辛普森双行星排变速机构的基础上,通过功率分流并调节发电机输入功率来实现无级变速,该变速器结构简单,传动效率高,具有较高的实用价值。     

平地机三种典型传动系统特性对比分析

机械传动、液力机械传动和全液压传动是现代平地机传动系统的三种主要传动方式.在对其结构形式和技术特点分析的基础上,提出液压机械复合传动的新型传动方式,并对机械传动、液力机械传动和液压机械复合传动的牵引性能、传动系统效率等关键性能进行对比分析.结果表明:机械传动具有最高的牵引功率和牵引效率,是平地机较为理想的传动方式;液力机械传动和液压机械复合传动分别利用液力变矩器和后置串联的机械变速箱可实现与机械传动相近的变速范围,但同时由于变矩器和液压系统存在功率损失,使得两者的传动效率均低于机械传动.     

前端调速式风力机组传动链建模与仿真

对前端调速式风力机传动链关键部件的工作原理进行分析,建立数学模型。分别建立风速模型、风轮空气动力学模型、传动链动力学模型、液力变矩器动态模型以及主轴转速计算模型。整合各子系统,引入神经网络控制,建立传动链整体仿真模型,进行模拟仿真。基于最大风能捕获量,综合考虑传动链结构参数,通过神经网络调节液力变矩器导叶开度,改变工作油循环流量,从而改变液力变矩器的输出转矩和转速。液力变矩器输出与风轮输出通过行星轮系综合作用于发电机前的主轴,使主轴转速稳定在设计值。     

推土机液力变矩器传动效率降低的原因

ＴＹ２２０推土机的液力变矩器为单级单相三元件式,其传动结构具有自动适应性强、延长机器使用寿命及驾驶员的舒适性提高和操纵简化等优点,但传动效率较低（一般为７５％～８５％）,且结构复杂。笔者在１０多年的施工实践中,通过对我队ＴＹ２２０推土机的实际使用和保养维修,对其液力变矩器传动效率降低的原因进行了探索,总结如下。 １．驾驶员操作的原因 由ＴＹ２２Ｏ推土机液力变矩器的输出特性曲线（见附图）可以看出,随着变矩器涡轮输出轴转速ｎ２的变化,发动机对变矩器的输出扭矩Ｍ１基本上是不变的,而变矩器的输出扭矩Ｍ２却…     

动力传动系统变矩器输入转矩测定方法研究

提出通过采集液力变矩器泵轮与涡轮转速，利用液力变矩器固有特性，经计算得到工作过程中发动机输入到液力变矩器泵轮上转矩及涡轮负荷转矩的新方法。该方法不采用转速转矩传感器，而采用磁电式转速传感器，传感器体积小、传感器布置方便、测点可选择性强。经实验验证本方法准确可行，且测量精度较高，可用于实车中发动机输入到液力变矩器泵轮上静态与动态转矩的测定。     

大型风电液力机械传动装置的分析与研究

本文紧扣液力变矩器在新能源领域的应用主题,阐述可调液力变矩器和行星传动装置组成的液力机械传动装置在风电领域应用的可行性,并对液力机械传动装置进行了理论分析,着重分析了行星排运动动力学方程、内啮合行星减速部件功能、可调变矩器结构与功能、变速恒频原理,并且对液力机械传动装置的控制原理进行了分析.     

The effect of torque scheduling on the performance and mechanical loads of a wind turbine

The generator torque control loop of a multi-MW wind turbine consists of three operational regions, i.e. a max Cp region, a transient region around the rated rotor speed, and a power regulation region. The performance and mechanical stress on the wind turbine structure are closely related with how the torque schedule is mechanized in the transient and above-rated regions. Using a drive train model, the closed loop dynamic characteristics for different torque schedules were analyzed. It is found that the slope of the torque for the rotor speed in the transient region is the major factor which determines the performance and mechanical loading of the wind turbine. The effect of using a variable torque instead of the fixed rated torque in the above-rated region is also analyzed.     

带有圆锥齿轮的复合行星传动功率流与传动效率分析

对带有圆锥齿轮的复合行星传动进行运动分析,在此基础上采用虚功率理论分析该复合行星传动在不考虑啮合功率损失和考虑啮合功率损失时的功率流,在定义速比与转矩比的情况下,获得复合行星传动效率表达式,进一步研究速比、转矩比和啮合功率损失系数及几何参数比对复合行星传动效率的影响规律,并开展相关试验验证。理论分析表明：在复合行星传动啮合功率损失系数和几何参数比被确定的情况下,复合行星传动效率随着转矩比的增大而增大,但随着速比的增大呈先减小后增大趋势;在复合行星传动速比和转矩比及几何参数比被确定的情况下,各齿轮副的啮合功率损失系数对复合行星传动效率的影响存在差异;在复合行星传动速比和转矩比及各齿轮副的啮合功率损失系数被确定的情况下,复合行星传动效率随着几何参数比的增大而增大。传动效率试验表明：选用高精度等级的锥齿轮、增大复合行星传动机构的转矩比及其行星轮的节圆半径可提高复合行星传动机构的传动效率。     

A study on the design of a new power transmission for wind turbines

The single-rotor wind turbine remains the dominant design for energy production. However, this design requires improvements to overcome some of its limitations. The introduction of the dual rotor system regarded as improvement over the single-rotor system in Korea due to its high efficiency, despite Korea’s low wind quality. Many researchers have attempted to devise different dual rotor machines and assess their power production capabilities under similar wind conditions to those in Korea. Existing power transmissions for dual-rotor wind turbines have issues with the complexity of design, difficulty in manufacturing, high costs and low efficiencies. Therefore, the aim of this study was to design a new power transmission for the dual-rotor wind turbine with an alternative to the bevel-planetary system by using a planetary system. This new method is dependent on the torque ratio and not the gear ratio as in common gear systems. The design and analysis of each part, such as the gears, shafts, bearings and control mechanisms are included in this study. The design is based on the power transmission of a motor vehicle. A prototype of the design is manufactured to verify the proposed method. The experimental results show that the new planetary-type gear box incurs fewer energy losses, has a high efficiency and low manufacturing costs. It is anticipated that the proposed design might be suitable for use with commercial wind turbines.     

液力传动叉车动力匹配优化

针对液力变速箱与发动机动力匹配计算困难的问题，推导出以输出功率最大为优化目标的数学模型，并用Excel软件对原始参数进行处理和规划求解，实现传动系参数的最优匹配。     

Analysis method and principle of dual-mode electro-mechanical variable transmission program

Automotive industry,as an important pillar of the national economy,has been rapidly developing in recent years.But proplems such as energy comsumption and environmental pollution are posed at the same time.Electro-mechanical variable transmission system is considered one of avilable workarounds.It is brought forward a kind of design methods of dual-mode electro-mechanical variable transmission system rotational speed characteristics and dual-mode drive diagrams.With the motor operating behavior of running in four quadrants and the speed characteristics of the simple internal and external meshing single planetary gear train,four kinds of dual-mode electro-mechanical transmission system scheme are designed.And the velocity,torque and power characteristics of one of the programs are analyzed.The magnitude of the electric split-flow power is an important factor which influences the system performance,so in the parameters matching design,it needs to reduce the power needs under the first mode of the motor.The motor,output rotational speed range and the position of the mode switching point have relationships with the characteristics design of the planetary gear set.The analysis method is to provide a reference for hybrid vehicles’ design.As the involved rotational speed and torque relationships are the natural contact of every part of transmission system,a theory basis of system program and performance analysis is provided.     

带式行星齿轮无级变速器的研究

带式行星齿轮无级变速器实质上是一种可无级变速的封闭式差动轮系。根据差动轮系的 3个基本构件中必有两个将同为主动件或从动件这一特点 ,推导出 3个效率计算公式 :并将功率流向分析、循环功率的确定及效率计算有机地联系在一起。同时 ,还分析了功率流类型与调速范围的关系 ,举例说明了这种无级变速器的设计步骤和计算方法