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Aiming at the security problem of cooperative robots, this paper presents a low cost collision detection algorithm without torque sensors. In this method, the collision can be detected with the sampling torque and the dynamic model. First, the relationship between the output torque and the motion state of the rotating joint of the robot is established according to the Newton Euler method. For the...
This document introduces an air-land robotic platform called Hexapodopter, capable of ground locomotion and vertical take-off and landing (VTOL). For walking, each of the limbs feature three degrees of freedom (DoF); for flying, the thrust is provided by a set of motors and propellers mounted on every limb. Due to its mechanical design, the Hexapodopter can reconfigure the thrust vectors of propellers...
The compliant control of the robot is widely used in the Human-Machine Interface (HMI) and robot bionics. Because the system and the environment are mutually constrained, when the external environment changes, the control environment of the system will change with it, which deteriorates the control performance of the system. This article solves the problem of how to realize the compliant control with...
This paper investigates the contour control problem of an X-Y table driven by two permanent magnet linear motors based on terminal sliding mode control method. By introducing a non-singular terminal sliding mode control(NTSMC), a novel contour controller is designed for biaxial motion control system. A variable exponential reaching law based on equivalent error was designed in order to eliminate the...
This paper presents the closed loop teleoperation of a minimal surgery training system using haptic and robot devices. The force tracking performances of system can be improved by using dynamic compensation and fuzzy control. In this system, the master is the 6-DOF haptic device and the slave is the 6-DOF serial robot. The master haptic device provides the trajectories for the slave serial robot throught...
This work addresses a technique for robot motion planning and navigation in dynamic environments. First, a model to represent the future evolution of the moving obstacles in the environment is defined in a robocentric reference, which maps the obstacle motion on the control space, the velocity-time space, of the robot. Second, a planning technique working on that model for navigation and maneuvering...
Simulation of the planar magnetic actuation of ferromagnetic bodies is proposed and experimentally verified in the framework of the system for precise positioning of miniature passive robots with two degrees of freedom. Major goal of presented development is to balance computational effort of the simulation with complexity of computational problem. Proposed methodology is developed for efficient simulation...
We perform a comparative analysis of energy-based performance criteria for the dynamics-based optimization of robot trajectories. The performance criteria considered include minimum torque, electrical power loss, approximation to mechanical work, and energy loss due to friction. Our dynamics model takes into account rotor inertias and gearing, and also considers robots subject to a range of motion...
We present a method to model and classify trajectory data that come from surveillance videos. Observations of the locations of moving entities are used to estimate their expected velocity in the scene. Such estimation is performed by a Gaussian process regression that enables to approximate probabilistically the expected velocity of entities given some observed evidence in the scene. Subsequently,...
In this paper, a new method for learning robotic debarring process motor skills from human skill model is presented. The skill of a human expert is obtained by using the human skill model. This model is implemented in robot control systems that make robots imitate human skills in deburring process tasks. Based on deburring process, family of basic pattern motions are listed by identifying the movement...
Pneumatic Artificial Muscles are under investigation for many years. Most of them are units of large dimensions, impossible to use in medical robotics. However, low emittance of heat of working medium is one of the most important advantages of this drive and crucial in medical robotics. Problem of combination of advantages of this drive and preferable for medical use size found solution at Lodz University...
The article focuses on designed construction of the exoskeleton, which significantly reproduces the kinematic structure and the range of joint movement of the human upper limb. The exoskeleton will able to control real objects i.e. loading crane, including force feedback. The designed device, composed of seven rotary joints, is equipped with the closed loop Bowden cable conduit system with linear...
This paper introduces an extension to a method for fast and close to optimal trajectory generation for articulated robots in the case where dynamic constraints and real-time capability are considered. We aim at solving reaching motion problems without pre-defined timing requirements, where the robot starts from its current state trying to reach the final desired state. Our approach combines the advantage...
In this paper, proposed a reaction force estimation and bilateral control of master slave manipulation in hydraulic servo system based on Sliding mode control with sliding perturbation observer (SMCSPO). The reaction force is estimated by sliding perturbation observer (SPO) without using any force sensor. The estimated reaction force without force sensor is transmitted to the master device using the...
In this paper, A simple method for estimating the impedance of a human hand is proposed. In a physical human-robot interaction situation, safety is a very important issue because humans are in contact with robots. Since robots become unstable when they contact a stiff external environment or when there is a difference between human motion intention and robot motion, knowing the dynamics of a human...
In this paper, a simple adaptive technique of synchronizing the motion of two systems in the master-slave configuration is presented. The slave pendulum system is required to follow the position and velocity of the master. Simply speaking, the motion errors between the master and the slave should be minimized by the feedback controllers. However, the same inputs to two similar systems do not provide...
High-level, closed-loop traversal through obstacle-strewn environments remains an open and challenging endeavor for snake-like robotic platforms. Rectilinear forms of locomotion, despite their unique mobility advantages compared to other gait shapes, have seen relatively little progress toward this objective. A dynamical exposition of traveling wave rectilinear motion is reviewed and applied to generate...
This paper presents the static and dynamic modeling for a recently discovered artificial muscle-twisted and coiled actuator (TCA). This actuator can generate large force and displacement; moreover, it is low-cost, easy to fabricate, and customizable. Since the discovery of TCA, it has been widely adopted for various robotic applications. Nevertheless, theoretical models to describe the static performance...
We present a mobile robot motion planning approach under kinodynamic constraints that exploits learned perception priors in the form of continuous Gaussian mixture fields. Our Gaussian mixture fields are statistical multi-modal motion models of discrete objects or continuous media in the environment that encode e.g. the dynamics of air or pedestrian flows. We approach this task using a recently proposed...
There has been consistent trials to make a hydraulic actuator to be effective in interactive robot applications that require high power and durability. However, conventional strategies to obtain this goal, such as force/torque servo control or adding elastic components, suffer from complexity, sensor problems, and reduced system robustness. In this paper, we show that introducing backdrivability to...
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