长幅外摆线轮齿廓曲线的优化圆弧

本文提出了用最优化圆弧代替长幅外摆线轮齿廓曲线的一种新型算法。该算法实用简单,拟合效果好,并可用于渐开线等其它类型曲线。     

Epicyclic Load Sharing Map — Development and validation

Under ideal conditions, every sun-planet-ring path in an epicyclic gear set transmits the same amount of torque. But, in the presence of certain manufacturing variations, equal load sharing is not achieved. In a companion paper, a physical explanation has been provided for the load sharing behavior observed in epicyclic gears. The explanation of the root cause led to the development of a load sharing formulation for 3, 4, 5, and 6 planet epicyclic systems. In this paper the same approach will be taken to develop the formulation for a seven planet epicyclic gear set. The developed expressions will then be used to develop the concept of an Epicyclic Load Sharing Map. This map describes the load sharing characteristics of every epicyclic gear set at any positional error and torque level. The developed expressions are then expanded to describe the general case when there are arbitrary errors on the position of every planet in the epicyclic gear set. Finally, the developed expressions will be validated by comparing the predicted load sharing behavior with the results from a validated system level computational model.     

间歇转位机构的分析与设计

为了改善槽轮机构的运动状况和提高其动力性能,本文给出了一种间歇转位结构,即行星齿轮——槽轮机构,并对其进行了分析与研究,最后得出了该机构所必须的设计参数.本文可供有关技术人员设计时参考.     

行星齿轮流量计动能变化的研究

介绍一种可用于测量液压系统高压侧流量的行星齿轮流量计,其工作原理是将被测的流量信号,转换成齿轮的转速信号,然后再通过单片机确定被测系统的流量.当被测液压系统的流量改变时,流量计内齿轮的动能及流经流量计流体的动能也会改变.重点考察上述两种动能的变化对被测流体的影响,结果表明,当被测流体流量在1～1000Hz频率范围内变化时,齿轮动能的变化对被测流体的影响相对流体液压能的变化产生的影响可以忽略;而流体动能变化对被测流体的影响与被测流体的流量变化频率无关,且相对于流体液压能的变化,其影响也可以忽略.     

基于功能离散法的周转轮系拓扑综合研究

提出基于功能离散法的拓扑图描述周转轮系,建立轮系拓扑单元的三个层次,总结出复杂轮系是在3种基本单元的基础上组成的,并根据基本单元的组合特点,提出4种组合方式。对拓扑图作缩微变换,建立了拓扑图的分层邻接矩阵,给出了同构判定步骤,为轮系的拓扑综合提供了理论基础。依据拓扑图中回路的特点,将常见的周转轮系分为四类轮系。以六齿轮周转轮系为例,提出轮系基本单元组合的统计方法,对于每一个基本单元的组合,依据拓扑演化规律得到拓扑图谱,并利用拓扑反演规律推导出各种可能的周转轮系。结果证明此拓扑综合法是构建新型行星轮系的方便有效方法,此方法具有一般性,可应用于多构件周转轮系的拓扑综合。     

2K-H型封闭式周转轮系的效率计算

本文研究了２Ｋ—Ｈ型封闭式周转轮系的效率与有关传动比的关系,导出了利用其差动轮系转化机构的传动比和两封闭构件间的传动比计算该种轮系效率的公式。     

Detection of a fatigue crack in a UH-60A planet gear carrier using vibration analysis

Two new methods of detecting a fatigue crack in a planet carrier of an epicyclic transmission are developed. These are tested using vibration data from a number of US Army UH-60A Black Hawk helicopter main transmissions. Vibration measurements of faulted and un-faulted transmissions over a range of torque levels in controlled test-cell and on-aircraft conditions are used. The results show that new methods are reliable under test-cell conditions, but less effective under low-torque on-aircraft conditions.     

Isomorphism identification for epicyclic gear mechanism based on mapping property and ant algorithm

To achieve computer-aided design for mechanism, one method that can be applied is graph theory. During the process of kinematic structure enumeration using graph theory, isomorphism identification of graphs is an important and complicated problem. The problem is known to be NP-complete problem. It is very important to improve the isomorphism identification efficiency and reliability. The objective of this research work is to use ant algorithm to improve the isomorphism identification efficiency and reliability for epicyclic gear mechanism. Based on mapping property between graphs, the isomorphism identification problem can be changed into a matrix operation problem. Two graphs must be isomorphism if the two matrixes of the two graphs can be exactly by exchanging their certain rows and columns, whereas show the two graphs must be non-isomorphic. A mixed model was developed for isomorphism identification by integrating the ant algorithm and mapping property between graphs. The gratifying results can be achieved while parameters are selected in appropriate situation by using the model. Finally, a computer program has been developed in Visual C++. Some examples confirm the validity of the model. The work will be a reliable isomorphism identification algorithm for intelligent CAD of epicyclic gear mechanism.     

传动比法(Крейнес法)的研究

深入地分析了传动比法的缺点，针对这些缺点得出了改进意见，改进后的传动比法便于使用，使封闭式行星传动的功率流分析和啮合效率计算变得十分容易。     

CALCULATIONS OF THE INNER DISTURBANCE FREQUENCIES INSIDE THE EPICYCLIC GEARING

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