巧测蜗杆齿厚

测量蜗杆齿厚的方法很多，如用圆柱测量肘值，这种方法计算复杂；用齿轮游标卡尺测量，这种方法测量精度低。在万能工具显微镜上从外圆量出分度圆半径再测量齿厚，但外圆直径误差对测量结果有一定的影响。因此，上述方法都不太理想。     

冲击波测量用压力传感器准静态校准方法

阐明了冲击波测量的意义,介绍了目前用于冲击波测量的方法,分析了这类方法存在的问题,为提高冲击波的测量精度,针对存在的问题,提出了一种适用且新颖的准静态冲击波测量用压力传感系统的校准方法-利用落锤液压动标装置对冲击波测量用压力传感系统实施准静态的绝对校准.     

万能方法测量圆柱齿轮渐开线偏差

渐开线齿形是保证齿轮运转平稳的重要因素之一。渐开线齿形的测量,用专用仪器或在万能工具显微镜上都能进行。但对于无专用仪器和超出仪器测量范围的大模数齿轮是无法测量的。所以探讨用万能方法进行测量,是很必要的。经多年实践证明,不但能测量,而且能解决在专用仪器上测量不了的大模数齿轮,并能用这种方法测量齿形标准件。此方法测量所用工具有:平台、块规、指示表及一些辅助工具,所以也称为平台测量齿形法。测量渐开线偏差就是测定渐开线齿面上     

铣刀或铰刀的前角及后角的测量

测量铣刀或铰刀的前角和后角,需要用铣刀测角仪才能测量,如果没有这种量具,可以用高度游标卡尺来测量。也能测量得的准确,现在将测量的方法介绍给大家参考。(一)前角的测量:如图1,把铣刀(或铰刀)的两端用顶尖顶住装好,把齿的前面放成水平位置,用     

螺纹中径测量的简易方法

问题的提出螺纹加工后的中径测量通常都是用螺纹千分尺,或三针测量的方法。这往往都要受条件的限制。如用螺纹千分尺测量,需据螺距大小不同采用相应规格的测量爪与其配合才能测得。用螺纹的三线测量和单线测量方法,则测量比较复杂,一般都得通过计算公式     

工作台平面度误差的水平仪闭合环测量法

工作台平面度误差的测量方法有多种。例如:用平板检验;用移动平尺所得的一组直线来检验,用水平仪检验;用光学方法检验。用液体联通器检验等。对尺寸较大的工作台,用水平仪按闭合环检验,有简便与精确的优点。本文阐述这种检验方法的测量原理、测量方法与测量精度分析。 一、测量     

圆锥螺纹的量法

圆锥螺纹需测量外径、有效径、螺距及螺纹半角(内经省略)。 一、圆锥螺纹外径的量法 圆锥螺纹外径的量法与圆锥量规的量法大致相同。其量法如下: (1)用圆锥样板──图1为圆锥样板,用透光方法测量斜度,用两条线测量外径大小。这种方法简单方便,但精度较差,因此,只适用於公差较大的工件,而不适於测量精密的产品。 (2)用圆锥量具测量──因有的工厂没有工具显微镜,用正弦规测量比较麻烦,所以一般精度的圆锥工件,多用圆锥量具测量,其情况如图2a、b。图2a为测量工件的情况,测量时是采用比较透光的方法;图2b为校正圆锥量具的情况,在校正时需用两种…     

用轮廓仪测量轴承套圈沟位置

介绍了用轮廓仪测量轴承套圈沟位置的新方法并改进了原有的方法,解决了用传统方法无法测量某些套圈沟位值的难题。     

内径表测量圆锥类零部件锥孔参数的方法设计

圆锥配合应用广泛,但锥孔的诸参数测量效率低。根据锥孔诸参数的测量原理．只使内径表竖向定位尺寸为已知,内径表就成为便捷的锥孔参数测量用表。本文同时简介了用内径表测量“锥孔”的方法,测量原理,以及锥孔参数计算方法。     

高精度不可见内回转曲面在线自适应测量

本文介绍一种测量精度为± 2微米的高精度计算机辅助二维在线测量系统的测量原理和方法。分析了系统精度 ,用双频激光干涉仪测量系统组成部分的误差 ,并通过软件方法进行补偿。用最小二乘原理对燕尾榫槽轮廓度加工误差进行误差分离和测量信息反馈 ,Minimax方法对轮廓度加工误差进行最优计算。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.