THEORETICAL TOOTH PROFILE AND ITS SUBSTITUTE CURVE OF THE PINION CUTTER FOR PINHOLES

ＴＨＥＯＲＥＴＩＣＡＬＴＯＯＴＨＰＲＯＦＩＬＥＡＮＤＩＴＳＳＵＢＳＴＩＴＵＴＥＣＵＲＶＥＯＦＴＨＥＰＩＮＩＯＮＣＵＴＴＥＲＦＯＲＰＩＮＨＯＬＥＳＴＨＥＯＲＥＴＩＣＡＬＴＯＯＴＨＰＲＯＦＩＬＥＡＮＤＩＴＳＳＵＢＳＴＩＴＵＴＥＣＵＲＶＥＯＦＴＨＥＰＩＮＩ...     

TOOTH CONTACT FINITE ELEMENT ANALYSIS OF SPIRAL BEVEL AND HYPOID GEARS

ＴＯＯＴＨＣＯＮＴＡＣＴＦＩＮＩＴＥＥＬＥＭＥＮＴＡＮＡＬＹＳＩＳＯＦＳＰＩＲＡＬＢＥＶＥＬＡＮＤＨＹＰＯＩＤＧＥＡＲＳＴＯＯＴＨＣＯＮＴＡＣＴＦＩＮＩＴＥＥＬＥＭＥＮＴＡＮＡＬＹＳＩＳＯＦＳＰＩＲＡＬＢＥＶＥＬＡＮＤＨＹＰＯＩＤＧＥＡＲＳＬｉＲｕｎ...     

ANALYSIS OF TOOTH FORM ERROR OF EQUAL BASE CIRCLE BEVEL GEAR

ＡＮＡＬＹＳＩＳＯＦＴＯＯＴＨＦＯＲＭＥＲＲＯＲＯＦＥＱＵＡＬＢＡＳＥＣＩＲＣＬＥＢＥＶＥＬＧＥＡＲＡＮＡＬＹＳＩＳＯＦＴＯＯＴＨＦＯＲＭＥＲＲＯＲＯＦＥＱＵＡＬＢＡＳＥＣＩＲＣＬＥＢＥＶＥＬＧＥＡＲＧｏｎｇＹｕｎｐｅｎｇ；ＤｉｎｇＳｈｉｃｈａｏ；Ｃ...     

LUBRICATION AND LOADED TOOTH CONTACT ANALYSIS FOR SPIRAL BEVEL AND HYPOID GEARS

ＬＵＢＲＩＣＡＴＩＯＮＡＮＤＬＯＡＤＥＤＴＯＯＴＨＣＯＮＴＡＣＴＡＮＡＬＹＳＩＳＦＯＲＳＰＩＲＡＬＢＥＶＥＬＡＮＤＨＹＰＯＩＤＧＥＡＲＳＬＵＢＲＩＣＡＴＩＯＮＡＮＤＬＯＡＤＥＤＴＯＯＴＨＣＯＮＴＡＣＴＡＮＡＬＹＳＩＳＦＯＲＳＰＩＲＡＬＢＥＶＥＬＡＮＤ...     

PROFILE TOLERANCE EVALUATION OF PARAMETRIC CURVES AND SURFACES

The profile error evaluation of complex curves and surfaces expressed in parametric form is considered. The linear error model is established on the base of two hypotheses firstly. Then the profile error evaluation is converted into one of these optimal formulations: MINIMAX, MAXMIN and MINIDEX problems, which are easier to be solved than the initial form. To each one of them, geometric condition and algebraic condition are presented to arbitrate whether the ideal element reaches to the optimal position. Exchange algorithm is proven highly effective in searching for solutions to these optimization problems. At last some key problems in tolerance evaluation of freeform surfaces and curves in B spline method are discussed.     

COMPARISON AND ANALYSIS OF THREE DIFFERENT NON－CONTACTING FLAME TEMPERATURE FIELD MEASUREMENTS

A much better substitutional means is discussed to calculate the flame temperature field with the application of digital image processing technology. Three non-contacting temperature measurements are used and compared. Such as the traditional two-color temperature measurement,the CCD filtering two-color temperature measurement and the monochromatic temperature measurement. It is indicated that the CCD two-color temperature measurement is not a fully correct means because of its poor theoretical basis. The monochromatic temperature measurement acquires a relatively ideal temperature field distribution in spite of needing a reference temperature. It should be noted that the Abel transformation applied in the plasma diagnosis is for the first time introduced to solve the problem of three-dimensional flame brightness piling.     

DEVELOPMENT AND VIBRATION ANALYSIS OF CERAMIC ROCKER ARM

ＤＥＶＥＬＯＰＭＥＮＴＡＮＤＶＩＢＲＡＴＩＯＮＡＮＡＬＹＳＩＳＯＦＣＥＲＡＭＩＣＲＯＣＫＥＲＡＲＭＤＥＶＥＬＯＰＭＥＮＴＡＮＤＶＩＢＲＡＴＩＯＮＡＮＡＬＹＳＩＳＯＦＣＥＲＡＭＩＣＲＯＣＫＥＲＡＲＭＹａｎｇＨｅｌａｉ；ＣｈｅｎｇＧｅｎｇ；ＳｕＦｅｎｇ（...     

APPLICATION OF ARCHITECTURE- BASED NEURAL NETWORKS IN MODELING AND PARAMETER OPTIMIZATION OF HYDRAULIC BUMPER

The dynamic working process of 52SFZ-140-207B type of hydraulic bumper is analyzed. The modeling method using architecture-based neural networks is introduced. Using this modeling method, the dynamic model of the hydraulic bumper is established; Based on this model the structural parameters of the hydraulic bumper are optimized with Genetic algorithm. The result shows that the performance of the dynamic model is close to that of the hydraulic bumper, and the dynamic performance of the hydraulic bumper is improved through parameter optimization.     

PERFORMANCE CHARACTERISTICS AND VISCOUS FLOW ANALYSIS OF CENTRIFUGAL PUMPS

ＰＥＲＦＯＲＭＡＮＣＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＮＤＶＩＳＣＯＵＳＦＬＯＷＡＮＡＬＹＳＩＳＯＦＣＥＮＴＲＩＦＵＧＡＬＰＵＭＰＳＰＥＲＦＯＲＭＡＮＣＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＮＤＶＩＳＣＯＵＳＦＬＯＷＡＮＡＬＹＳＩＳＯＦＣＥＮＴＲＩＦＵＧ...     

AUTOMATIC DISPLACEMENT ANALYSIS OF PLANAR MECHANISMS WITH MATCHING BASIC KINEMATIC CHAINS METHOD

A simple, efficient, automatic and universal method to fulfill displacement analysis of a great deal of mechanisms regenerated by Yan's mechanism creative theory has been developed. For a regenerated mechanism, at first, the method identifies its type and structure and changes it into a rigid structure by fixing the ground link and the input link. And then this rigid structure is decomposed into a set of basic kinematic chains (BKCs). By matching the type of BKC, the displacement analysis equations can be set up, and all possible configurations, in which positions of all movable links are considered, can be given out.     

微线段齿廓齿轮的弯曲强度分析

介绍了微线段齿轮的形成原理,建立了微线段齿轮有限元计算的力学模型,论证了计算中的奇点问题,并提出相应的解决方案,用正交试验法设计了一组算例并用有限元法进行计算,从而说明微线段齿轮的弯曲强度确实要优于渐开线齿轮。     

新型人字齿同步带轮根切与齿廓修形

针对新型人字齿带轮加工中,滚刀齿根和齿侧圆弧刃在带轮上形成的共轭曲面出现折线不光滑问题,利用空间微分几何和啮合理论对滚刀共轭齿廓上折线产生机理进行了研究。通过对滚刀齿廓曲面根切界限曲线特点分析,确定了滚刀曲面消除带轮曲面奇异点的参数约束条件,提出了在滚刀法面齿廓上增加过渡圆弧曲线消除带轮齿廓奇异点的修形方法,建立了具有根切约束条件的滚刀修形齿廓模型。在进行修形后的带轮齿廓与人字齿同步带耦合分析基础上,确定带轮修形滚刀法面齿廓齿形参数。通过计算仿真对比,修形后带轮齿廓槽顶曲线光滑,可以减小啮合过程中的磨损,为提高带轮齿面的光滑度提供了有效的修形方法。     

活齿传动齿廓修形原理及方法研究

本文建立了活齿传动的结构模型,推导出共轭齿廓修形曲线方程式;在分析五种修形量修形特征的基础上,创立了以改善啮合条件、提高承载能力和啮合效率为目标的“顶根修形法”和“转角等距移距修形法”;还提出两种工艺简单的共轭齿廓间接修形法,研究成果完善了共轭齿廓修形理论及方法。     

摆线针轮行星传动的齿形修正及受力分析

B.H.库德略夫采夫提出的关于摆线针轮行星传动中摆线轮与针齿啮合时的受力分析方法,由于未考虑摆线轮齿形修正的影响,在工程计算中带来极大的误差。本文在讨论摆线轮齿形合理修正方式的基础上,提出了一种能适用于修正齿形进行有隙啮合,因而符合工程实际条件的较准确的力分析方法和计算公式。     

SELECTION OF GEOMETRIC PARAMETERS OF GEAR AND GRINDING WHEEL TO ENSURE MAXIMUM GEAR TOOTH PROFILE ACCURACY

An analysis of possibilities for the selection of gear and tool geometry parameters is presented to reduce tooth profile errors during the grinding of gears by double tapered wheel (Hofler or Niles method), double wheel generating (Maag method) and by worm wheel techniques (Reishauer method). The selection of gear and tool geometry parameters is based on the analysis of the grid diagram of a gear and a rack. Formulas and graphs are presented for the selection of the pressure angle, module, and addendum of the rack-tool. The experimental results of the grinding of gears confirm the theoretical analysis.     

齿廓修形对功率二分支齿轮传动系统的动载荷影响分析

针对功率二分支齿轮传动系统,考虑时变啮合刚度、齿侧间隙,并把齿廓修形作为一种时变齿侧间隙计入,建立了功率分流齿轮传动的弯-扭-轴耦合动力学模型和相应的非线性动力学方程。对方程求解,得出了齿廓修形与齿轮副动载系数的关系,说明合理的修形可使功率分流齿轮传动不发生齿面分离和齿背冲击现象;利用不同修形量下各齿轮副动载系数峰值的等高线,确定最佳修形量,使齿轮传动的动载系数最小。研究结果表明,合理的齿廓修形,可以使功率二分支齿轮传动系统的最大动载系数由3.6减小到1.6。     

SELECTION OF GEOMETRIC PARAMETERS OF GEAR AND GRINDING WHEEL TO ENSURE MAXIMUM GEAR TOOTH PROFILE ACCURACY

ABSTRACT

An analysis of possibilities for the selection of gear and tool geometry parameters is presented to reduce tooth profile errors during the grinding of gears by double tapered wheel (Hofler or Niles method), double wheel generating (Maag method) and by worm wheel techniques (Reishauer method). The selection of gear and tool geometry parameters is based on the analysis of the grid diagram of a gear and a rack. Formulas and graphs are presented for the selection of the pressure angle, module, and addendum of the rack-tool. The experimental results of the grinding of gears confirm the theoretical analysis.     

大型摆线针轮行星传动的合理结构和齿形

通过对1972年以来国内外研究成果的综合理论分析,特别是根据1977年以来我们自己研究试验的成果,本文不仅提出了一种机理正确、切实可行的大型摆线针轮行星传动的合理结构方案,还提出了一种用普通工艺获得新颖、理想齿形的摆线轮齿形修正方法。由此不但可以有效防止胶合,而且可在不增加径向尺寸的条件下,成倍提高传递功率与转臂轴承的寿命。     

铁钻工冲扣钳牙板齿参数分析与优化

针对铁钻工冲扣钳牙板齿在拧卸扣过程中出现的崩齿和磨损现象,基于Ansys Workbench有限元软件,对牙板齿接触钻杆时的极限静态工作状态进行弹塑性分析,根据应力线性化原理分析了牙板齿与钻杆接触部位的应力,并进行了分类识别与评定。再以牙板齿关键参数作为研究对象,结合加工能力进行两次正交试验确定不同的优化方案。利用压力胶片测得了牙板齿与钻杆的接触应力,通过拟合数据得到施加压力与牙板齿所受最大应力线性曲线,验证了优化方案和有限元分析结果的合理性。评定方法和结果为冲扣钳拧卸扣装置的牙板齿参数的确定提供了依据,试验方法对同种类型设备的应力测试分析提供了新途径,对保证冲扣钳安全可靠有效工作具有重要的工程意义。     

双激波套筒活齿传动的接触应力分析及其优化

双激波套筒活齿传动结构中的活齿是关键且容易失效的零件,活齿的接触应力分析对于提高机构承载能力及使用寿命具有重要意义.通过数值法对活齿接触表面压力及次表面应力场分布进行求解,结果显示接触应力会出现奇异和应力集中的问题,严重影响了传动机构的传动性能.应用对数母线修形法与遗传优化算法对套筒活齿的结构进行优化设计,结果表明,该...