虚拟手在Vega中的设计与实现

以数据手套为虚拟外设，以Vega为虚拟现实开发平台，开发出一个可交互和漫游的虚拟手模型。通过分析人手的解剖结构和运动特性，建立虚拟手的节点层次几何模型和运动模型。然后用MFC和Vega编程实现虚拟手的运动，并可通过定义与手势相匹配的运动对三雏虚拟场景进行漫游。     

基于数据手套的发动机虚拟装配系统

运用EON虚拟现实软件实现了直列四缸发动机的虚拟装配。利用CATIA软件建立发动机三维实体模型,通过3ds Max渲染使零件着色,建立真实的虚拟环境。在EON中添加数据手套、方位跟踪器等控制虚拟外设的节点,并建立虚拟手模型。通过数据手套和方位跟踪器驱动虚拟手模型,获得人手的空间坐标数据,并转换为虚拟手模型的虚拟坐标数据。在沉浸式虚拟环境中完成抓取、移动、释放物体等操作,实现发动机的虚拟装配过程。通过VB与EON Studio之间信息的传递实现发动机各个模块的集成,为操作者提供了良好的交互系统平台。     

基于数据手套的机械手移动与抓取过程的动态仿真分析

人机交互是虚拟现实的关键技术,本文利用数据手套驱动虚拟机械手移动与抓取过程。首先构建了基于数据手套的机械手交互系统实验平台,通过MEMS传感器获取机械手运动轨迹,然后基于VC＋＋ MFC程序界面创建了虚拟环境并对机械手移动与抓取过程进行动态仿真,实现虚拟机械手按照操作者的指令实时地完成移动和物体抓取等动作。     

上肢康复机器人手和手臂的集成研究

针对现有上肢康复机器人手跟手臂没有集成的不足,利用虚拟现实交互性强、沉浸感好的技术特点和EON SDK的开发功能,通过在EON Studio软件中开发Glove节点和Arm节点,分别用于获取5DT数据手套跟上肢康复机器人手臂的数据,实现上肢康复机器人手跟手臂结构和功能的集成.并建立一个能提高患者训练兴趣的虚拟超市场景和虚拟手,使场景中的虚拟手能随机械手臂和数据手套运动而运动,让患者在康复训练中有身临其境的感觉,对提高康复治疗有很大的促进作用.     

面向手部康复应用的数据手套技术研究

疾病或意外发生后经常会引起患者的手部功能障碍,但目前手部康复评估仍然依赖医生经验等主观判断,市场上现有的部分康复产品结构复杂、价格昂贵,而且无法长期记录病人的康复数据,不便于医生进行诊断和复查。提出了一种面向手部康复的多传感器数据融合手套,采用最小二乘法对加速度和地磁进行校正,利用互补滤波进行传感器数据融合,依据真实手骨模型进行虚拟手部建模,用数据手套获得的手部姿态驱动Unity3D中的手部模型。该系统可以准确地记录手的姿态信息,并在虚拟环境中进行实时还原,能高效地帮助医生进行康复评估和协助患者进行康复训练。     

基于数据手套驱动的虚拟机器人操作技术

虚拟机器人是机器人遥操作系统基本框架中不可或缺的一部分 ,是解决信号传输中的大时延 ,实现预测显示技术的关键之一。本文首先分析了引起时延的各种因素 ,提出采用预测预演控制方式结合虚拟现实的人机交互方法进行控制可以解决时延对系统可操作性的影响 ,同时探讨了利用数据手套实现虚拟机器人的操作技术 ,试图寻找一种更自然、更易让人接受的虚拟机器人控制方式 ,建立了一套基于数据手套驱动的虚拟机器人Puma5 6 0操作实验系统。实验结果表明 ,通过数据手套的手势输入和识别 ,可以实现操作者对虚拟机器人方便快捷的操作控制 ,是一种人性化的人机交互方法。     

面向虚拟制造和装配的新型数据手套设计

基于平面四杆机构和空间六杆机构运动的确定性原理,研制了一种面向虚拟制造和装配的机械电子式数据手套。介绍了数据手套的原理、标定和可视化的研究,给出了该数据手套的性能、优缺点和试验数据。     

集成虚拟装配环境中的多约束导航技术研究

提出一种基于增量驱动和归约原理的多约束导航解算方法,该方法采用FOB的相对位姿变化量来驱动虚拟手、基于归约原理求解多约束运动导航,并将此方法应用于集成虚拟装配系统(IVAE)。实例表明,该方法能有效地处理FOB与虚拟手的位姿分离以及多约束作用下的运动导航问题。     

虚拟装配中的虚拟手交互技术

针对目前虚拟装配系统中操作者与虚拟对象交互的问题,本文的研究以数据手套作为虚拟装配操作的交互工具定义装配过程中虚拟手与零／部件的作用规则,建立虚拟手对零／部件的抓取,移动和释放的装配操作逻辑,成功地实现了虚拟装配环境中对零／部件合理而自然的装配操作。该操作方法已应用于集成虚拟装配系统(IVAE)。     

基于数据手套的仿生手硬件在回路仿真系统

传统的仿生手仿真主要是对外部结构和控制系统进行动力学仿真,缺乏人机交互性。针对这一问题,提出了一种基于数据手套的硬件在回路仿真方法:采用数据手套做为人机交互设备,利用上位机完成数据采集;通过无线传输实现与下位机的通讯;在MATLAB/SIMULINK环境下进行数据处理并针对ADAMS-MATLAB仿生手模型应用PID控制器,实现对仿生手的运动姿态控制。实验结果表明仿生手虚拟样机可以实现对操作者手部姿态的还原,说明了该方法的有效性。     

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.