工业机器人精密减速器性能测试研究

介绍了工业机器人精密减速器性能测试的现状,对传动误差、回程误差、启动转矩、机械效率进行了分析,可以为工业机器人减速器的轴承游隙调整和装配工艺提供指导。     

“洛阳轴承”入选机器人研发“国家队”

<正>洛阳轴研科技股份有限公司最近成功竞标国家"863"计划项目"机器人用精密轴承研制及示范应用"并收到首批国拨经费。该项目力争通过3年攻关,使我国工业机器人轴承性能指标达到国际先进水平。该项目将针对国产机器人产业发展需求,开展机器人专用精密轴承设计、制造、测试、寿命试验等技术研究,研制等截面壁、交叉圆柱滚子两种系列轴承和RV减速器、谐波减     

RV减速器及其在机器人上的应用

RV减速器自1986年投入市场以来,作为机器人用减速器是刚性最高的低振动减速器,因而得到广泛使用。最近,在文献上发表的实例也相应增多,主要介绍其开发过程,各项性能等。本文简单介绍一下构造等问题,主要针对主轴承内装型RV减速器,说明其使用上的要点。     

本期导读

2020年第49卷第11期关键词柔性薄壁轴承P01 (约稿)谐波减速器是工业机器人核心部件之一,柔性薄壁轴承是谐波减速器的关键零部件,其性能与稳定直接影响减速器的性能。以往对柔性薄壁轴承应用特性的研究都是将其置于谐波减速器整体研究中进行粗略分析,无法结合其工作过程的变形及载荷交变特性开展深入研究,     

机器人用精密减速器性能试验工装夹具优化设计

机器人用精密减速器是连接伺服电机与机械臂的传动部件,是机器人的三大核心零部件之一。为了保障机器人整体的性能,必须对机器人用精密减速器的性能进行全面的评测。常见的机器人用精密减速器性能试验台分为驱动模块、被试件安装模块和负载模块。其中,位于驱动端与负载端之间且被频繁更换的被试件安装模块的结构直接影响整个测试系统的同轴度和运行稳定性。介绍减速器性能试验台的结构特点,提出减速器被试件模块工装优化设计方案。大量装配测试证明,改进后的工装能使RV-E型减速器在装配过程中更容易达到高同轴度要求,在测试过程中运行更加平稳。     

精密RV减速器受力分析

机器人RV减速器中摆线轮,轴承是RV减速器的重要零部件,其受力大小有较大影响。以RV-80E减速器为研究对象,对摆线轮与摆线轮支撑轴承,进行受力分析计算,并使用UG软件进行运动仿真,验证其受力准确性。得出轴承受力与曲柄轴角度,摆线轮针齿受力变化曲线,为相关研究RV减速器零件的优化分析和应用提供了数据支持。     

RV减速器用轴承的受力分析

针对RV减速器用轴承设计过程中存在受力状况难以确定的问题,从RV减速器的运动原理出发,结合减速器的结构特点及理论力学,对3类轴承的受力状况进行分析。研究表明,RV减速器内部角接触球轴承受力最大,保持架组件次之,圆锥滚子轴承受力最小。     

机器人用减速器性能测试方法探讨

通过论述国内外机器人减速器性能检测技术研究现状，对比了与国外的差距，分析了机器人用谐波减速器和机器人用精密齿轮传动装置标准方法差异。选取机器人用谐波和RV减速器，对精密减速器的扭转刚度、传动效率两个关键性能指标的测试方法进行探讨，并对其测试方法进行了验证。通过探讨，结论是现行国标对机器人精密减速器的性能测试方法的规定不统一，机器人用精密减速器的扭转刚度和传动效率值都与角位移和转矩这两个基本参数相关，测量设备本身的精度和设计方法影响测量结果，设备标准化、集成化、智能化方面仍有较大发展空间。     

工业机器人RV减速器专用精密轴承技术分析

介绍RV减速器轴承的分类,分别从轴承的结构类型、应用特性、材料及加工难点3个方面对RV减速器用主轴承、摆线轮支承轴承、偏心轴支承轴承及太阳轮支承轴承进行分析探讨,重点论述了RV减速器轴承的各项技术特性。     

刮板输送机用大功率行星减速器故障分析

通过对煤矿井下工作面刮板输送机用大功率行星减速器输入、输出端油封和轴承失效等常见故障产生的原因进行深层次分析,研究出解决密封和轴承失效的措施和故障预判方法。改进后的减速器经过两年多的实际应用,密封和轴承失效问题减少,效果非常显著。实践证明这些措施能降低工作面刮板输送机用大功率行星减速器密封和轴承失效的问题,减少了密封和轴承失效造成齿轮、轴承、密封件等关键部件的二次破会,降低了减速器维护成本。     

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。     

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.     

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.     

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.     

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...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.