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将平行四边形机构应用于轮腿的设计中,提出了一种新型连杆铰接轮腿式机器人的设计方案。针对该新型轮腿式机器人的特点,提出了三种不同的步态:爬行步态、对角步态和滚动步态。借鉴了腿式机器人的一些概念和方法,对三种步态的生成原理和运动特性进行分析,并研究了该机器人在采用这三种不同步态情况下的重心高度变化规律、步距、占空比以及稳定裕度。运用ADAMS软件对平地和沟渠两种地形进行了仿真试验。仿真结果表明,该新型轮腿式机器人在稳定性、环境适应能力、步行速度等方面有明显的优势,同时也证明了三种步态的可行性和有效性。 相似文献
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针对六足机器人运动规划问题,设计了一种六足仿蜘蛛机器人。首先,利用SolidWorks设计了六足仿蜘蛛机器人的机械结构;然后,通过建立六足仿蜘蛛机器人的D-H坐标系,构建了仿蜘蛛机器人行走机构的运动学模型,对机器人的单腿正、逆运动学进行了分析,推导了正逆运动学方程;最后,对几种典型步态进行了分析,运用多项式差值拟合的方法对仿蜘蛛机器人的摆动相及支撑相作了足端轨迹的规划;在此基础上,将SolidWorks模型导入到ADAMS/View中,利用ADAMS对几种典型步态进行了仿真,验证了对其步态规划的正确性。研究结果表明:该六足仿蜘蛛机器人的设计方案是有效的。 相似文献
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设计了一种结构简单、承载能力强、越障性能好的新型轮腿式机器人——rolling-wolf。该机器人采用滚珠丝杠驱动轮腿运动,有效改善了以往轮腿式机器人的力学性能,提高了系统的承载能力以及轮腿机构的稳定性。首先将所设计的rolling-wolf和普通关节式轮腿机器人的力学特性进行了对比分析,分析结果表明rolling-wolf轮腿机构在力学特性上具有优越性。然后建立了rolling-wolf的运动学模型,并使用MATLAB对三种不同结构的rolling-wolf的轮腿运动包络域进行了求解。最后,根据对不同结构的rolling-wolf运动特性分析结果,选择了具有最佳运动特性的轮腿机构,完成了机器人整体结构设计。 相似文献
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链节式八足机器人的运动分析及步态规划 总被引:1,自引:0,他引:1
以链节式八足机器人为研究对象,从运动学分析、稳定性研究和步态控制的角度出发,分析了机器人的姿态变换和运动步态规划问题。首先阐述了该机器人的整体机械结构,然后利用逆运动学方法求解了机器人末端执行机构的位置,多组可行解的存在说明该机器人可通过多种方式实现姿态的灵活变换;其次利用正运动学方法求解了机器人末端执行机构的速度,证明该机器人具有快速行走的特性;与此同时,还进行了机器人末端执行机构运动稳定性的分析和机器人多种步态的规划,可看出其具有良好的静态稳定性和动态稳定性,并可看出该机器人在步态规划方面具有可规划性好、可控制性强的特点。研究成果可为多足机器人技术的发展提供借鉴与参考。 相似文献
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针对非结构环境下六轮腿机器人地形通过性及高效行走问题,在已有并联六轮腿机器人模型的基础上,建立六足轮腿机器人运动学模型,分析机器人在凸起、凹坑、斜坡、崎岖等典型非结构地形下的移动能力,获得典型非结构地形机器人移动能力与机器人构型参数的相互影响关系.进而规划了六轮腿机器人典型大尺度非结构地形条件下的运动步态,通过ADAMS软件仿真验证了运动模型的正确性及运动步态的可行性;研究结果可为六轮腿机器人非结构地形条件下实现高效行走的控制策略提供借鉴. 相似文献
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设计开发的静液压步行机器人是模拟牲畜步行腿结构,采用机电液一体化技术,可实现机体的三角形步态行走和转向功能。6条步行腿两侧对称安装,按三角形步态分两组,即A组提腿,B组压腿。当A组大腿往下压腿时,小腿受地面反作用力往后运动而压缩油缸,油缸把油传到B组小腿的油缸,实现B组小腿的往前踢。转向时,转向一侧的小腿只往后收缩,不往前踢,另一侧的3条腿则保持行走,从而实现转向。小腿的踢腿运动和收缩运动通过静液压系统实现。曲柄连杆步行机构与静液压技术结合,可设计开发出能够负载的步行机器人,可拓展应用于机器人新领域。 相似文献
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Adaptive gaits for legged robots often requires force sensors installed on foot-tips, however impact, temperature or humidity can affect or even damage those sensors. Efforts have been made to realize indirect force estimation on the legged robots using leg structures based on planar mechanisms. Robot Octopus III is a six-legged robot using spatial parallel mechanism(UP-2UPS) legs. This paper proposed a novel method to realize indirect force estimation on walking robot based on a spatial parallel mechanism. The direct kinematics model and the inverse kinematics model are established. The force Jacobian matrix is derived based on the kinematics model. Thus, the indirect force estimation model is established. Then, the relation between the output torques of the three motors installed on one leg to the external force exerted on the foot tip is described. Furthermore, an adaptive tripod static gait is designed. The robot alters its leg trajectory to step on obstacles by using the proposed adaptive gait. Both the indirect force estimation model and the adaptive gait are implemented and optimized in a real time control system. An experiment is carried out to validate the indirect force estimation model. The adaptive gait is tested in another experiment. Experiment results show that the robot can successfully step on a 0.2 m-high obstacle. This paper proposes a novel method to overcome obstacles for the six-legged robot using spatial parallel mechanism legs and to avoid installing the electric force sensors in harsh environment of the robot’s foot tips. 相似文献
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The previous research regarding the gait planning of quadruped robot focuses on the sequence for lifting o and placing the feet, but neglects the influence of body height. However, body height a ects gait performance significantly, such as in terms of the stride length and stability margin. We herein study the performance of a quadruped robot using the equivalent mechanism concept based on metamorphosis. Assuming the constraints between standing feet and the ground with hinges, the ground, standing legs and robot body are considered as a parallel mechanism, and each swing leg is regarded as a typical serial manipulator. The equivalent mechanism varies while the robot moves on the ground. One gait cycle is divided into several periods, including step forward stages and switching stages. There exists a specific equivalent mechanism corresponding to each gait period. The robot's locomotion can be regarded as the motion of these series of equivalent mechanisms. The kinematics model and simplified model of the equivalent mechanism is established. A new definition of the multilegged robot stability margin, based on friction coe cient, is presented to evaluate the robot stability. The stable workspaces of the equivalent mechanism in the step forward stage of trotting gait under di erent friction coe cients are analyzed. The stride length of the robots is presented by analyzing the relationship between the stable workspaces of the equivalent mechanisms of two adjacent step forward stages in one gait cycle. The simulation results show that the stride length is larger with increasing friction coe cient. We herein propose a new method based on metamorphosis, and an equivalent mechanism to analyze the stability margin and stable workspace of the multilegged robot. 相似文献
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XU Kun DING Xilun 《机械工程学报(英文版)》2014,(5):867-879
Most gait studies of multi-legged robots in past neglected the dexterity of robot body and the relationship between stride length and body height.This paper investigates the performance of a radial symmetrical hexapod robot based on the dexterity of parallel mechanism.Assuming the constraints between the supporting feet and the ground with hinges,the supporting legs and the hexapod body are taken as a parallel mechanism,and each swing leg is regarded as a serial manipulator.The hexapod robot can be considered as a series of hybrid serial-parallel mechanisms while walking on the ground.Locomotion performance can be got by analyzing these equivalent mechanisms.The kinematics of the whole robotic system is established,and the influence of foothold position on the workspace of robot body is analyzed.A new method to calculate the stride length of multi-legged robots is proposed by analyzing the relationship between the workspaces of two adjacent equivalent parallel mechanisms in one gait cycle.Referring to service region and service sphere,weight service sphere and weight service region are put forward to evaluate the dexterity of robot body.The dexterity of single point in workspace and the dexterity distribution in vertical and horizontal projection plane are demonstrated.Simulation shows when the foothold offset goes up to 174 mm,the dexterity of robot body achieves its maximum value 0.164 4 in mixed gait.The proposed methods based on parallel mechanisms can be used to calculate the stride length and the dexterity of multi-legged robot,and provide new approach to determine the stride length,body height,footholds in gait planning of multi-legged robot. 相似文献
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针对当前轮腿式越障机器人的局限性,设计了一种新型的车轮可变结构机器人,该机器人可以在轮腿之间自如切换。介绍了可变结构车轮的工作原理,该机构在平坦地面上运动以轮子模式行走,当遇到障碍物切换为类花瓣模式越过障碍。对车轮在两种模式下的直行与转弯过程进行理论分析,建立了运动学仿真模型,并对模型进行求解。为了验证分析结果,采用Adams软件对车轮的越障过程与复杂路面行走进行了运动仿真。仿真结果表明,设计的车轮结构可行性较高,具有轮式机构的稳定性,同时具有腿式机构较高的越障能力,使机器人可以适应多种复杂的路况环境。 相似文献