修配法的修配环尺寸简明计算

对修配法装配工艺过程作了分析，推出计算修配前配环尺寸的简明极限偏差关系式。     

修配环制造尺寸的简明分析与计算

全面分析了修配环被修时对封闭环变化影响的 3类情况 ,推导出各种情况下修配环制造尺寸的简明计算公式 ,使修配法的计算更完善 ,更经济 ,更简便     

机械装配中修配法修配量的计算

修配法装配过程复杂，但装配精度高。通过修配法装配过程的深入分析及实际工作的长期实践，得出了一套简明实用的公式，该公式更加简明，规律性强，使计算过程快捷、正确，使复杂的分析计算变得简单明了。     

修配环尺寸的实用简明计算

本文系统地导了了修配法解装配尺寸链中计算修配前修配环尺寸的平均偏差关系式，提供了丙套既能用于概率修配法，又能用于极值修配法的计算公式，使计算更为方便，简明。     

修配环尺寸确定方法

用修配法来保证产品的装配精度,就是将各组成环(包括修配环)按经济精度加工,在装配尺寸链中各组成环的累积误差相对于封闭环公差(即装配精度要求)的超出部分可通过对修配环的补充加工(即修配)予以消除。由此可见,修配环在装配尺寸链中起调节作用。     

修配法解装配尺寸链的新方法

本文提出一种不同于传统分析的，用于各种情形的修配法解装配尺寸链的新方法。     

装配尺寸链修配环最大修配量的分析与计算

在飞机装配中，对修配环进行修配是补偿和协调飞机装配累积误差的有效方法之一。为了满足封闭环的装配要求，修配量应当有一个极限值。首先分析修配时修配环影响封闭环的4种情况，分别推导了这4种情况下修配环最大修配量计算公式，其结果相同。该公式有助于装配过程中对修配环进行合理修配，并已在飞机装配中得到了应用。     

修配环尺寸及其极限偏差的新算法

提出了考虑最小修配量时计算修配环尺寸的计算方法,并与传统计算方法进行了比较,说明了适用范围。     

修配法解装配尺寸链的实质分析

本文全面地论述了修配法解装配尺寸链的主要实质问题，明确地提出了并论证了能用于各种情形的修配法解装配尺寸链的简明，方便，实用的计算公式。     

曲柄摇杆机构图解设计的解圆定理

提出并证明了适用于1≤K〈∞的曲柄摇杆机构图解设计的解圆定理。     

φ14M环形加热炉改造修理的体会

主要阐述了进口Φ14M环形加热炉的改造设计和合理施工。施工程序：施工前的准备工作；炉体的局部折除；安装台车及相关部件的修理；耐热混凝土部分的施工。由于改造设计合理，进行科学施工，不但缩短施工时间、节约资金，而且加热炉达到节能、高效的要求，大大提高了生产效率。     

基于AutoCAD2000的图解法确定工艺转角

提出了基于AutoCAD2 0 0 0的图解法求解机械加工过程中工艺转角的问题 ,并针对具体的应用实例给出了圆满的解答 ,并验证了其精度。     

任意复杂曲面曲线零件曲率半径的图解法

复杂曲面零件在机械设计中很广泛 ,本文根据微分几何的分析方法 ,研究了曲线在基本三面形上的投影特性 ,得出了空间曲线上某点的曲率等于该曲线在密切面的投影的曲率 ,从而用图解法求出空间曲线在密切平面上的投影及其曲率 ,即求出空间任意曲线的曲率。在实际工程中具有现实意义和较大的推广应用。     

Analytical Solution of Piston Ring Lubrication Using Mass Conserving Cavitation Algorithm

A novel analytical approach for piston ring lubrication solution is presented by taking proper account of mass conservation in the cavitated region (JFO boundary conditions). A system of five nonlinear equations is employed to calculate such parameters as oil film thickness, frictional force, power loss, and oil flow rate. For an enclosed cavitation pattern in piston-ring assembly it was found, that JFO boundary conditions give much better accounting of the estimation of friction force, power loss and flow rate. To show the effectiveness of the undertaken approach, the widely accepted Jeng's approach (Jeng, 1992a) was selected, in which the pressure contribution from the cavitated and the second full film regions, as well as the trailing edge pressure, are ignored.     

Analytical Solution of Piston Ring Lubrication Using Mass Conserving Cavitation Algorithm

A novel analytical approach for piston ring lubrication solution is presented by taking proper account of mass conservation in the cavitated region (JFO boundary conditions). A system of five nonlinear equations is employed to calculate such parameters as oil film thickness, frictional force, power loss, and oil flow rate. For an enclosed cavitation pattern in piston-ring assembly it was found, that JFO boundary conditions give much better accounting of the estimation of friction force, power loss and flow rate. To show the effectiveness of the undertaken approach, the widely accepted Jeng's approach (Jeng, 1992a) was selected, in which the pressure contribution from the cavitated and the second full film regions, as well as the trailing edge pressure, are ignored.     

自动变速箱内置式齿轮泵齿圈断裂的解决方法

为了解决无卸荷槽的内置式齿轮泵的齿圈断裂的问题,利用三维建模软件建立齿轮泵模型,通过FLUENT进行内部流场仿真,得到分别开设无卸荷槽、对称式卸荷槽和偏置式卸荷槽齿轮泵的最高困油压力值,并计算出3种泵的容积效率,验证了采用偏置式卸荷槽的泵能很好地解决困油问题且能提高泵的容积效率。通过计算设计出偏置卸荷槽的偏移位置,并进行样机试验验证。经比较试验结果与仿真结果相近,这为设计内置式齿轮泵提供了参考。     

液压缸活塞密封圈非均匀磨损的机理研究及解决方案

活塞外表面密封圈在活塞缸中,起到隔离两腔、防止泄漏的作用。工作过程中密封圈经常出现单边、局部的非均匀磨损。非均匀磨损的主要原因是因为活塞杆与活塞连接以后所导致的活塞外表面与缸筒内表面的不同轴。通过采用柔性连接方式,可以消除活塞杆与活塞连接以后产生的影响因素,解决液压缸活塞外表面密封圈产生的非均匀磨损。     

气膜冷却壁面温度的计算方法和计算曲线

用作图法求解了气膜冷却壁面的热平衡方程。计算方法中引用了本文作者最近做出的绝热壁面恢复温度的有效温比实验公式。算出了气膜冷却壁面的辐射热流量、气膜冷却热流量,外壁对流冷却和外壁辐射散热等。并用作图法求出了气膜冷却壁面的平衡温度和气膜冷却效率。有效温比、换热系数、气体黑度系数等都可用本文提供的图表直接查找。     

Graphic stereo-reconstruction of serial sections

Serial histological sections may be graphically reconstructed in the form of paired ‘stereo-maps’ for observation with a stereoscope. Comfortable stereo-vision is obtained if the contour lines which produces grades are laterally parallaxed to an appropriate degree. Since the technique is advantageous and its procedures are simple in practice, it will be applied in a number of investigations. The basis of the technique is that the parallax is achieved by staggering one of the half-maps with a micrometer at the rate of one-tenth the section interval, which gives rise to perspective in the stereo-vision. Some fundamental conditions, involved in procedures as well as observation, were investigated in order to consider the nature of the final image. Thus, it has proved to be a satisfactory representation. Other than the primary reconstruction, which is observed at right angles to the sectional plane, a method to convert the viewing direction, or the profile cartography, has been developed, so that we are able to observe sectioned structures practically from any direction.