液压驱动双足机器人步态规划及动力学仿真

为实现双足机器人步行运动,提出了一种双足机器人平地行走步态规划算法并对其进行动力学仿真验证。首先利用二维倒立摆模型以及五次多项式分别对机器人质心、踝关节运动轨迹进行规划,再通过建立机器人运动状态几何模型,对运动过程中机器人腿部关节运动轨迹进行规划,得到关节角运动轨迹,借助MATLAB仿真获取机器人下肢各个关节运动曲线。然后利用动力学仿真软件Adams对虚拟样机进行仿真,实现了机器人虚拟环境下的平地稳态行走,仿真验证了步态规划算法的可行性。     

基于MATLAB与SolidWorks的六自由度机器人联合建模仿真

针对一种6自由度教学机器人,在MATLAB/Simulink环境下,利用MATLAB自带的Virtual Reality工具箱导入SolidWorks建立的三维实体模型并在虚拟环境中显示机器人运动,同时利用Simulink中的SimMechanics模块集建立机械系统仿真模型并输出仿真数据,实现机器人虚拟样机的建立及运动仿真。提出的联合建模仿真方法综合利用了以SolidWorks为代表的CAD软件强大的三维实体建模功能、Simulink/SimMechanics便捷的机械控制系统建模仿真功能、Virtual Reality逼真的场景显示功能以及MATLAB强大的数据处理和图形显示功能,对机器人仿真研究和开发设计具有重要参考价值。     

基于V-REP的双机器人协同运动仿真与实验研究

针对目前国内外机器人建模和仿真能力较差,软件功能扩展性和开放性较差,无法满足机器人协同控制要求的现状,提出了一种基于V-REP的双机器人协同运动控制方法.首先在仿真软件中建立机器人模型并生成运动路径,通过逆向运动学计算获取协同搬运路径对应的关节参数,然后在V-REP软件中建立双机器人模型,并通过Lua脚本语言控制双机器人进行协同运动仿真.采用所提出的方法对双机器人协同搬运过程进行仿真和实验,结果表明该方法有效可行,为以后的其他机器人运动仿真提供了参考.     

仿生蝠鲼机器人的设计及仿真

以蝠鲼的躯干和胸鳍的结构与运动原理分析为基础,设计了一款仿生蝠鲼机器人。在保留蝠鲼主要行为参数的前提下,简化了复杂的身体结构。通过控制每个鱼鳍的两个自由度,较为准确地复现蝠鲼的运动状态。建立仿生蝠鲼机器人的控制曲线及表面结构的三维模型,采用Adams软件对其进行机构运动仿真(包括运动、速度及转弯实验),通过仿真来验证机器人结构及运动控制系统的正确性。     

轮足混合式行走机器人运动学建模与仿真

结合足式机器人与轮式机器人的优点,提出了一种基于2(6-UPUR+3P)混联腿的轮足混合式行走机器人构型,并对该机器人进行了运动学建模与仿真分析.基于螺旋理论建立机器人并联腿部单支链的六维运动螺旋系,基于此得到1阶影响系数矩阵,进而推导出6-UPUR并联腿部的运动学模型;提出了机器人机身姿态调整算法,改善了机器人在静态步行步态下机身运动的平稳性;用Matlab算例仿真与Adams仿真对比验证得出运动学模型的正确性,用Adams/Simulink联合仿真验证得出机身姿态调整策略的有效性,为进一步进行轮足混合式行走机器人控制系统的设计奠定基础.     

基于MATLAB施釉机器人喷枪喷涂仿真及实验研究

针对喷枪垂直喷涂平面情况下喷枪参数对喷涂质量的影响,采用MATLAB软件对施釉机器人进行了仿真及实验研究。首先,建立和确定施釉机器人喷枪数学基础模型;然后在各项喷涂指标不变的情况下进行定点喷涂实验仿真;最后通过喷涂实验与仿真实验的对比分析,验证了在误差允许的范围内喷枪基础数学模型的正确性,这有助于推动施釉机器人在陶瓷制造领域的应用。     

基于ADAMS和MATLAB的机器人联合运动仿真

运用三维CAD软件Solid Works建立了一款四自由度SCARA型机器人的实体模型,应用多体系统动力学仿真软件ADAMS对其进行运动学仿真分析;接着通过ADAMS与MATLAB的接口模块,在MATLAB中构建机器人的联合仿真控制系统,分别以阶跃函数和正弦函数为输入,采用PID方法控制机器人关节位置,实现基于ADAMS和MATLAB的机器人联合运动学仿真。仿真结果显示,该机器人能够按照期望的驱动运动且轨迹跟踪特性良好。     

铣削机器人动力学建模及仿真研究

铣削机器人在铣削过程中的动力学状况对机器人在铣削过程中的运动及其稳定性具有较大影响。以6-DOF铣削机器人为研究对象,利用Creo三维软件建立机器人三维模型,获得建立机器人动力学模型的惯性参数;采用Newton-Euler递推法建立该机器人的动力学方程,并在MATLAB环境下对所建立的动力学方程进行编程,对机器人运动过程进行计算分析;利用ADAMS软件对建立的三维模型进行动力学仿真分析,通过比较MATLAB计算结果与ADAMS仿真分析结果,以验证动力学方程的准确性,为铣削过程中铣削机器人动力学状况研究提供理论基础。     

基于AMESim与SIMULINK的双绞车恒张力控制研究

介绍了有缆水下机器人的双绞车收放系统的组成以及恒张力控制原理,在AMESim中搭建了双绞车系统仿真模型,并结合MATLAB/SIMUIINK利用联合仿真技术设计了闭环模糊PID控制器,对牵引绞车及储缆绞车之间的缆绳进行了恒张力控制仿真试验,试验结果表明所构建的双绞车恒张力控制系统具有良好的跟踪性和鲁棒性.     

基于Adams和Matlab的自平衡机器人仿真

首先简述了机器人仿真研究的现状,以及机械系统动力学分析仿真软件Adams及Simulink在机器人仿真上的应用.然后应用拉格朗日方程建立了系统的动力学方程,应用Adams和Matlab对自平衡机器人进行了联合仿真.仿真结果表明,基于Adams和Matlab的自平衡机器人具有较好的动态特性.     

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.