This paper proposes two novel rescue robots,including a cutter robot and a jack robot,which are aimed to contribute to rescue activities such as to cut through obstacles and to jack up debris in dangerous sites and na...
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This paper proposes two novel rescue robots,including a cutter robot and a jack robot,which are aimed to contribute to rescue activities such as to cut through obstacles and to jack up debris in dangerous sites and narrow spaces,where a rescue team can not work or ***,a multilinked tracked rescue robot platform composed of connected crawler vehicles is developed,which has high mobility on irregular terrain and ability to move into narrow collapsed ***,the cutter robot and jack robot are designed on the basis of rescue robot platform equipped with a cutter or a jack mechanism and corresponding manipulators in the front *** cutter refitted by an angle grinder is able to cut through 10 mm diameter steel *** electric jack mechanism designed based on multiple layers screw sleeves structure can lift up 300 kg load from 70 mm to 400 *** results validate the capability of the two rescue robots.
In order to improve the travelling ability of the wheel-type pipeline robot in elbow section of pipeline, the model of drive ratios is proposed aiming at the pipeline robots with different configurations. Through the ...
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In order to improve the travelling ability of the wheel-type pipeline robot in elbow section of pipeline, the model of drive ratios is proposed aiming at the pipeline robots with different configurations. Through the movement analysis of the robot with different configurations in elbow section, the pose model of the robot is established, and the coordinates of the wheel centers and the contact points can be got through the calculation of the pose model. Based on the pose model established, the corresponding drive ratios are obtained combining with the relations of the velocities of wheel centers and rotative velocities of wheels under the movement condition with no interference. The virtual simulations and prototype experiments are carried out, and the drive ratios accuracy of the model when the robot moved in elbow without interference is validated.
Target tracking control for wheeled mobile robot (WMR) need resolve the problems of kinematics model and tracking ***-order sliding mode control is a valid method used in the nonlinear tracking control system,which ...
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Target tracking control for wheeled mobile robot (WMR) need resolve the problems of kinematics model and tracking ***-order sliding mode control is a valid method used in the nonlinear tracking control system,which can eliminate the chattering of sliding mode *** there lacks the research of robustness and uncertain factors for high-order sliding mode *** address the fast convergence and robustness problems of tracking target,the tracking mathematical model of WMR and the target is *** on the finite-time convergence theory and second order sliding mode method,a nonlinear tracking algorithm is designed which guarantees that WMR can catch the target in finite *** the same time an observer is applied to substitute the uncertain acceleration of the target,then a smooth nonlinear tracking algorithm is *** on Lyapunov stability theory and finite-time convergence,a finite time convergent smooth second order sliding mode controller and a target tracking algorithm are designed by using second order sliding mode *** simulation results verified that WMR can catch up the target quickly and reduce the control discontinuity of the velocity of WMR.
General,high-precision theoretical modeling method is not well developed in the field of soft robotics,which holds back motion control and practical application of soft *** concept of modularization brings novel struc...
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General,high-precision theoretical modeling method is not well developed in the field of soft robotics,which holds back motion control and practical application of soft *** concept of modularization brings novel structure,novel locomotion patterns as well as novel control method for soft *** paper presents the concept of hierarchical control method for modular soft robot system and a H-configuration pneumatic modular soft robot is designed as the control *** H-configuration modular soft robot is composed of two basic motion units that take worm-like locomotion *** locomotion principle of the basic motion unit is analyzed and the actuation sequence is optimized by evolution strategy in VOXCAD simulation *** differential drive method is applied to the H-configuration modular soft robot with multi motion modes and vision sensor is used to control the motion mode of the *** H-configuration modular soft robot and the basic motion unit are assembled by a cubic soft module made of silicone ***,connection mechanism is designed to ensure that the soft modules can be assembled in any direction and *** are conducted to verify the effect of the hierarchical control method of the modular soft robots.
Humanoid robots have attracted much attention by virtue of their compatibility with human ***,biped humanoids with immense promise still cannot function steadily and reliably in real-world settings in the current ***,...
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Humanoid robots have attracted much attention by virtue of their compatibility with human ***,biped humanoids with immense promise still cannot function steadily and reliably in real-world settings in the current ***,rationally combining a humanoid robot with different stable mobile platforms is a favoured solution for diverse ***,a new versatile humanoid robot platform,aiming to provide a generic solution that can be flexibly deployed in diverse scenarios,for example,indoors and fields is *** humanoid robot platform incorporates multimodal perception,and extensible interfaces on hardware and software,allowing it to be rapidly integrated with different mobile platforms and end-effectors,only through easyto-assemble ***,the platform has achieved impressive integration,lightness,dexterity,and strength in its class,with human-like size and rich perception,targeted to have human-intelligent manipulation skills for human-engineered ***,this article elaborates on the reasoning behind the design choices,and outlines each ***,the essential performance of the platform is successfully demonstrated in a set of experiments with precise and dexterous manipulation,and human–robot collaboration requirements.
The purpose of this paper is to present and evaluate a method of free gait generation for HITCRI,a hexapod walking *** HITCR-I is designed as a modularized structure of legs that is based upon a four-bar linkage mecha...
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The purpose of this paper is to present and evaluate a method of free gait generation for HITCRI,a hexapod walking *** HITCR-I is designed as a modularized structure of legs that is based upon a four-bar linkage mechanism and with force sensors in the tip of legs,distributed hardware structure and a modular software structure of the control *** on a set of local rules between adjacent legs,finite state machine(FSM) model is built to control the coordination of *** automatic smooth transition of gait pattern is achieved through deriving the mathematical relation between gait pattern and locomotion *** disordered inter-leg phase sequence is adjusted to a regular state smoothly and quickly by the local rules based FSM,and the gait pattern can transform automatically adapting to irregular *** experiment on HITCR-I has demonstrated that it can walk through irregular terrain reliably and expeditiously with the free gait controller designed in this paper.
For the non-holonomic constraint robot,determining the pose of its end-effector will rely on its joints' displacement and the velocity of its non-holonomic constraint joints as ***,it becomes increasingly difficul...
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For the non-holonomic constraint robot,determining the pose of its end-effector will rely on its joints' displacement and the velocity of its non-holonomic constraint joints as ***,it becomes increasingly difficult to obtain the analytic solution of its self-motion manifold in the traditional way for solving matrix *** this paper,we take the pose of end manipulator as the result of the joint sequential motion based on the mentality of motion equivalence,the structure and the reference velocity which correspond precisely to the points in self-motion manifold as self-motion *** an analytical solution for the self-motion manifold of the 8 degree of freedom wheeled mobile manipulator is presented by taking vector algebra as a tool,which facilitates deriving the closed solution of its self-motion *** the closing part of this paper,calculating examples of self-motion manifold and mechanism self-motion simulation are proposed,which proves the validity of solution algorithm for self-motion manifold.
A novel modular self-reconfigurable robot called UBot is *** robot consists of severalstandard *** module is cubic structure based on double rotational DOF,and has four connect-ing surfaces that can connect to adjacen...
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A novel modular self-reconfigurable robot called UBot is *** robot consists of severalstandard *** module is cubic structure based on double rotational DOF,and has four connect-ing surfaces that can connect to adjacent modules.A hook-type mechanism is designed,which can quick-ly and reliably connect to or disconnect from adjacent *** mechanism is self-locking after con-nected,and *** achieve small overall size and mass,compact mechanical structures andelectrical systems are adopted in modular *** modules have embedded power supply and adoptwireless communication,which can avoid cable-winding and improve flexibility of locomotion and self-re-configuration.A group of UBot modules can adapt their configuration and function to the changing envi-ronment without external help by changing their connections and positions .The basic motion and self-re-configuration are proposed,and the experiments of worm-like locomotion are implemented.
A prototype of hydraulically powered quadruped robot is presented. The aim of the research is to develop a versatile robot platform which could travel fleetly in outdoor terrain with long time of en- durance and high ...
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A prototype of hydraulically powered quadruped robot is presented. The aim of the research is to develop a versatile robot platform which could travel fleetly in outdoor terrain with long time of en- durance and high load carrying ability. The current version is 1. lm long and 0.48m wide, and weights about 150kg. Each leg has four rotational joints driven by hydraulic cylinders and one pas- sive translational joint with spring. The torso carries the control system and the power system. A no- vel control algorithm is developed based on a Spring-Loaded Inverted Pendulum model and the prin- ciple of joint function separation. The robot can not only cross a 150mm high obstacle in static gait and trot at 2.5km/h and l km/h on the level-ground and 10°sloped-terrain respectively, but also au- tomatically keep balanced under lateral disturbance. In this paper, the mechanical structure and control systems are also discussed. Simulations and experiments are carried out to validate the design and algorithms.
To solve the problem of multi-turning attitudes,unknown ground parameters and complex skidsteering control for serpentine tracked robots(STR),a fuzzy control method based on the estimation of track curvature and side ...
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To solve the problem of multi-turning attitudes,unknown ground parameters and complex skidsteering control for serpentine tracked robots(STR),a fuzzy control method based on the estimation of track curvature and side slip angles is *** on the track-ground interaction,mathematical models are established for stable turning in the way of recursive homogeneous *** navigation parameters such as rack curvature and side slip angles have approximately linear relationship with the yaw angles of articulate *** attitude models in turning control are studied and *** strategies of attitude models are *** on the strategies,an adjustable fuzzy controller is *** the controller,an estimator is set to solve the problem of unknown and variable *** estimator predicts the track curvature by metabolic linear least squares *** have verified the feasibility and validity of the controller.
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