仿生四爪式爬管机器人的运动学分析与仿真

设计了一种具有较强的越障性能和负载能力的仿生四爪式爬管机器人,分析了机器人的构型与步态;采用D-H参数法建立了各连杆坐标系,并对各关节的正逆运动学方程进行求解;利用Matlab中Robotics Toolbox模块,建立了机器人在上部躯干两侧手爪处于夹紧状态时的运动学模型,求解得到各关节角度、速度及加速度与时间的关系曲线;将机器人在robotic中的关节运动所得到的数据拟合成Spline曲线,并导入ADAMS中进行机器人整体虚拟样机仿真;仿真实验表明机器人能够顺利进行尺蠖式爬升运动,验证了结构的合理性和运动学方程求解的正确性。     

虚拟样机技术在刨床摇杆机构优化中的应用

针对由CAD软件导入ADAMS中的模型无法使用优化工具的问题,探讨了对某型牛头刨床摇杆机构进行优化的方法。利用虚拟样机技术,在Pro/E软件中按真实尺寸建立摇杆机构的模型,导入ADAMS环境对该机构进行运动仿真,绘制出机构中滑枕的加速度曲线并进行分析。以此建立了摇杆机构的等效简化模型,对滑枕的加速度进行了优化设计。根据最佳的优化参数在Pro/E中修改原模型的结构尺寸,并再次导入ADAMS中进行运动仿真,结果与简化模型的优化结果一致。     

一种新型3P-1R并联机构三维建模及运动仿真的实现

基于以单开链为单元的并联机器人机构组成原理,构造了一种能够实现空间三维移动和一维转动的3P-1R并联机构,并运用CAXA实体设计软件构建了该并联机构的三维参数化模型.通过CAXA与ADAMS之间的数据交换,实现了ADAMS环境下该新型3P-1R并联机构虚拟样机的运动学仿真.结果表明,新型3P-1R并联机构虚拟样机构建合理,运动仿真具有可信度.     

一种新型3P-1R并联机构三维建模及运动仿真的实现

基于以单开链为单元的并联机器人机构组成原理,构造了一种能够实现空间三维移动和一维转动的3P-1R并联机构,并运用CAXA实体设计软件构建了该并联机构的三维参数化模型。通过嘲与ADAMS之间的数据交换,实现了ADAMS环境下该新型3P-1R并联机构虚拟样机的运动学仿真。结果表明,新型3P-1R并联机构虚拟样机构建合理,运动仿真具有可信度。     

虚拟环境下自卸车举升机构的运动仿真与优化

介绍了利用ADAMS软件的虚拟样机技术，建立自卸车举升机构的虚拟样机模型；并对其进行运动仿真及优化，从而得到举升机构位置的最佳布置方案。     

一种爬杆机器人的结构设计与性能分析

针对城市杆状建筑的清洗和维护问题,设计了一种新型爬杆机器人,采用一个驱动机构完成了移动和夹持两种功能。研究了爬杆机器人在攀爬过程中的步态,并建立了爬杆机器人的虚拟样机,利用多刚体动力学仿真软件ADAMS完成了机器人攀爬过程的仿真,分析了机器人攀爬过程中的位移、电机转矩与机械手夹持力的变化情况。仿真结果表明,机器人能够按照预定方向完成平稳的运动,电机转矩有一定波动但不影响机器人的攀爬稳定性。通过仿真分析可知,单侧机械手与灯杆之间平均接触力大小约为32.4 N,机器人对灯杆直径变化有一定的适应能力。     

基于虚拟样机的仿生推进装置运动学仿真

用Pro/E软件建立了仿生推进装置的机构模型,利用虚拟样机软件ADAMS对机构进行仿真,得到了翼盘的位移、速度曲线及连杆的驱动力矩曲线,证实机构运动符合预设的要求.为进一步的研究和优化仿生推进装置提供了依据.     

仿水母推进的水下机器人的设计与仿真分析

以仿水母推进的水下机器人为研究对象,设计其机械架构,并就推进步态进行分析,进一步利用ADAMS软件建立了该仿生机器人的虚拟样机,对该仿生机器人进行了动态模拟仿真实验。具体地,研究了在推进过程中仿生机器人扑水柔性片、外撑杆、与线性轴承的速度和位移随时间变化的关系,以及该仿生机器人机构协调能力。仿真结果表明:该仿生机器人在一定介质流体系数下有着较好的机构协调能力,各运动曲线连续、平缓且呈周期性,可满足实际需求。     

基于虚拟样机技术的机器人运动学研究

介绍了基于ADAMS软件的5自由度串联机器人运动学仿真方法,构建了机器人虚拟样机并对其进行运动学仿真,利用ADAMS强大的运动仿真、函数、测量及后处理功能,对仿真结果进行了分析,结果表明该方法简单、方便、有效.     

基于ADAMS的并联机器人动力学仿真

应用机械系统动力学仿真分析软件ADAMS,建立了一种并联机构的虚拟样机模型。对并联机器人进行动力学分析,为并联机器人系统的设计、制造和模拟运动作业提供了理论依据和主要参数。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

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。     

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...     

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。     

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。     

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.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

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.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...