推杆减速器内齿圈齿廓的公法线及加工精度控制

提出了一种用于计算杆减速器内齿圈齿廓公法线长度的有效方法,并分析了加工内齿圈齿廓时一些工艺参数的误差对公法线长度的影响,从而可在加工过程中对这些参数进行调整,使之达到要求的精度。     

检测二齿差摆线轮时公法线长度的计算和确定方法

首先提出了二齿差摆线轮公法线的存在条件,并提出了一种新的方法来计算公法线检测时的接触位置参数和长度,确定了最小跨齿数就是最佳跨齿数,并考虑了等距、移距、转角修形对公法线测量的影响,根据本文理论编制计算机软件可以准确地计算出各种跨齿数下公法线长度及检测位置。     

关于齿轮公法线长度公式的讨论

从公法线平均长度计算式出发 ,讨论了测量公法线长度时卡尺的卡脚与齿廓的切点位于分度圆上的条件、跨测齿数的最佳值与极限值 ;介绍了变位齿轮公法线长度公式在切齿加工中的应用。     

关于齿轮公法线长度公式的讨论

从公法线平均长度计算式出发,讨论了测量公法线长度时卡尺的卡脚与齿廓的切点位于分度圆上的条件,跨测齿数的最佳值与极限值,介绍了变位齿轮公法线长度公式在切齿加工中的应用。     

基于VB的公法线计算系统的研究与实现

为了解决公法线计算效率低的问题,开发出了基于VB和SQL Server的公法线计算程序。用户只需输入齿轮相关参数就可以得到相应的跨齿数、公法线长度和极限偏差结果。同时,用户可以根据自己需要管理数据库。结果表明,该程序使公法线计算快速、准确,提高了工作效率。     

双圆弧齿轮公法线长度的计算

近年来双圆弧齿轮传动得到广泛的应用。在实际生产中,一般是通过测量弦齿深或齿根圆直径来控制齿轮的最终加工尺寸。但事实上,双圆弧齿轮也能像渐开线齿轮一样通过测量公法线长度控制最终加工尺寸。相对于其它测量方法,用公法线长度测量简便易行,更容易达到较高的测量精度。但在有些文献中双圆弧齿轮公法线长度的计算方法不正确,以致生产上未能得到应用。本文通过公式推导和计算指出了《齿轮手册》第四篇(机械工业出版社,1990年版,以下称文[1])关于圆弧齿轮公法线长度的通用计算式存在错误,不     

对“变位圆柱齿轮公法线长度的正确计算”一文读者来信的综述

本刊1989年8期上刊出周万峰的“变位圆柱齿轮公法线长度的正确计算”一文(以下简称周文)后收到江西建筑机械厂王洪藻、上海轻工业专科学校袁孝成、昆山通用机械厂徐保国等读者的来信。我们认为,周文中的:“变位齿轮公法线长度(L)等于标准齿轮的公法线长度(L′),加上变位齿轮公法线长度的附加量(2Xmsina)。即 L=L′+2Xmsina此式是合理的。只是测量变位齿轮公法线长度时的跨齿数计算公式与测量标准齿轮公法线长度的跨齿数计算公式不同而已。周文要提醒大家注意:在计算变位齿轮公法线长度时要按变位齿轮公式计算跨齿数。     

基于弦截迭代法计算双圆弧齿轮公法线长度

依据双圆弧齿轮传动及其公法线长度的计算原理和公式,以81型双圆弧齿轮为例,提出利用弦截迭代法计算双圆弧齿轮公法线长度、求解方程流程图及迭代方程,比手工计算大大降低了工作量,而且精度也得到了保证。     

Hy-Vo齿形链链轮公法线长度的计算方法

在分析Hy-Vo齿形链链节围在链轮轮齿上定位时其节距增量和当量边心距增量对链轮公法线长度影响的基础上,根据Hy-Vo齿形链与链轮的正确啮合条件,通过参数变化,建立了Hy-Vo齿形链—链轮—滚刀三者之间的啮合设计体系,提出了既适用于链板齿形角等于链轮压力角情况,也适用于链板齿形角不等于链轮压力角情况的Hy-Vo齿形链链轮公法线长度的计算方法。试验研究表明,这种新的计算方法是科学的,也是切实可行的。指出了大负变位、短齿、齿顶倒大圆角结构形式的Hy-Vo齿形链链轮公法线长度、跨测齿数的计算与修正方法。     

双圆弧齿轮公法线长度的精确计算方法

本文以圆弧齿的通用齿面方程为基础，从理论上首次推导了精确计算圆弧齿公法线长度的数学关系式，从而解决了现有的圆弧齿轮公法线长度计算方法中存在计算误差大，难于应用在实际生产中控制齿轮最终加工尺寸的问题。并通过计算实例，把本文介绍的方法同现有方法作比较。     

变齿厚斜齿轮

本文简述了变频厚斜轮的形成方法;通过变齿厚斜齿轮与圆柱齿轮所具有的相同点及不同点的分析说明了它的特点和设计方法。     

BP神经网络模型在旋转机械故障诊断中的应用

本文利用神经网络模型建立了旋转机械常见故障的类别与征兆之间的映射关系.并利用这一模型对几种常见故障进行了分析诊断,诊断结果表明本方法精度高,结果可靠,对于工程应用具有一定的实用价值.     

利用牛顿迭代法计算双圆弧齿轮传动公法线长度

以双圆弧齿轮传动及其测量尺寸公法线长度的计算原理和公式为依据,以81型双圆弧齿轮为例,提出利用牛顿迭代法计算双圆弧齿轮公法线长度的原理、流程及迭代方程,与手工计算相比大大降低了工作量,而且精度也得到了很好的保证。     

公法线测量和近似计算蜗轮齿厚

分析了用公法线测量蜗轮齿厚的理论依据,从而推导出跨齿数及公法线长度的近似计算公式,由此来确定蜗轮的模数和齿厚。     

Oil Film Stiffness of Double Involute Gears Based on Thermal EHL Theory

Lubrication failure is one of the main failure forms of gear failure.Time varying meshing stiffness is an important factor affecting the dynamic behavior of gears.However,the influence of oil film stiffness is usually ignored in the research process.In this paper,according to the meshing characteristics of double involute gears,based on the non-New-tonian thermal EHL theory,a new calculation method of normal and tangential oil film stiffness for double involute gears is established by the idea of subsection method.The oil film stiffness difference between double involute gears and common involute gears is analyzed,and the influence of tooth waist order parameters,working conditions,and thermal effect on the oil film stiffness are studied.The results reveal that there are some differences between normal and tangential oil film stiffness between double involute gears and common involute gears,but there is little dif-ference.Compared with the torque,rotation speed and initial viscosity of the lubricating oil,the tooth waist order parameters have less influence on the oil film stiffness.Thermal effect has a certain influence on normal and tan-gential oil film stiffness,which indicates that the influence of thermal effect on the oil film can not be ignored.This research proposes a calculation method of normal and tangential oil film stiffness suitable for double involute gears,which provides a theoretical basis for improving the stability of the transmission.     

A method for organizing the access to the slow-control channels of the ZEUS detector

The slow-control system operation consists in periodic polling of all parameters that need to be controlled and comparing values obtained with admissible deviations from normal values. This is necessary for the safe functioning of the facility and for reliability of the experimental data obtained. For modern experimental setups, when a large number of parameters need to be monitored, the problem of access to the slow-control data becomes complex. In this paper, a method for organizing the access to the slow-control channels is described. The method is based on using two search structures corresponding to the common database for channels and parameters.     

非标准原始廓形齿轮加工问题的探讨

介绍了用标准齿轮滚刀加工非标准圆柱齿轮时,滚刀的选择和机床的调整方法。分析了由于滚刀基节与齿轮基节不相等,造成的齿轮加工误差。此误差可通过在公法线长度方向上加大留磨量,进行磨齿予以消除。此方法对齿轮修配具有一定的指导作用。     

IDENTIFICATION OF NON-PROPORTIONAL MODAL DAMPING MATRIX AND REAL NORMAL MODES

Equations of motion for non-proportionally damped structures cannot be decoupled by using the real normal modes. For such structures, the complex normal modes are in common use for this purpose, but for the validation of finite element mass and stiffness matrices where physical damping matrices are not available, the related experimental real normal modes must be known. In previous publications, an identification theory using the real normal modes and the non-diagonal modal damping matrix for the non-proportionally damped system and some applications with the computer code ISSPA were presented. However, the theory cannot assure the symmetry of the identified modal damping matrix, which must be theoretically symmetric. In this paper, a method for identifying the symmetric non-proportional modal damping matrix using undamped modal parameters obtained from ISSPA is presented and the validity of the method is demon-strated through both numerical and experimental examples.