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This paper presents a novel compensation of rolling friction for ball screw driven stage. Recent years, many kinds of friction models based on complicated equations are studied. However, it is difficult to treat friction models based on equations. The reasons are that precise modeling which represents the real friction characteristic and parameter tuning are difficult. In this paper, a model based...
This paper presents an analysis of the accuracy of urban railway train's parking together with an elaboration of the system structure and principle of parking control in ATO mode. Through the construction of the model of pneumatic brake unit, the non-linear character of pneumatic brake unit is analyzed, and thereby the strategy of feedback control based on the train's position signal is given. Further...
In this paper, the problem of position and force control of a robotic manipulator in contact with the environment is considered. The Hybrid Impedance Control (HIC) methodology is employed to control the position of the end-effector in such a way that the robot exhibits a desired dynamic property and hence desired Impedance which in turn results in tracking the interaction force. It is assumed that...
This paper presents control and implementation of the mobile manipulator with balancing mechanism whose goal is to serve human being in home environment. The mobile manipulator has two arms to handle objects. Not only position control but also force control of the balancing service robot is presented. The robot has two modes to move : mobile robot mode with 4 contact points and balancing mode of 2...
Recently, the study of real-world haptics is taken place actively. Haptics is scholarship about tactile sensation. Among them, the realization of high accuracy micro manipulation is demanded from many industrial fields such as medical treatment and manufacturing. In micro region, high accuracy positioning system and multi-degree of freedom system are needed for precise manipulation. However, operator...
Recently, doctor and medical care persons are shortage by the aging of population. Thus, support systems using a robot are needed for future medical care. The position controller and velocity controller are used in order to operate the human support system. However, these controllers cannot consider complicate and natural human motion. This paper proposes a method of human support system using motion-copying...
The main aim of this paper is to design a hybrid force-position controller using fuzzy logic (FL) for the robotic arm of a 9 degrees of freedom (DOF) upper limb wearable exoskeleton rehabilitation robot. The robot is designed and built in our lab for assisting in the rehabilitation of patients post-stroke. The robotic arm of the rehabilitation robot is driven by pneumatic muscles (PM) and its dynamic...
Recently, the development of “haptic recording” is demanded, and a motion-copying system is one of good methods for realization haptic recording. The haptic recording is the technology for saving and reproducing human motion based on haptic information which is constructed by position and force information. One of the problems of the motion-copying system is that the saved human motion is reproduced...
This paper proposes an analysis method about bilateral tele-operation. The bilateral tele-operation is the key technology to the tele-communication. At this point, the bilateral tele-operation treats 2 systems and each system is controlled position and force information. Thus, force information which is attained to a system affects position and force information of another system. These effects are...
This paper proposes a new smooth touch control for operating industrial robots in unknown environments. The touch control is an useful strategy for the smooth switching from the position control to the force control. Many applications require flexibility to the environments. For example, direct teaching by using a manual control is one of the typical applications. A highperformance force control method...
This article describes a new control scheme designed for a three-degree-of-freedom (3-DOF) flexible robot. The control scheme consists of a two multivariable control loops; the inner loop controls the position of the motors, and the external loop controls the tip's position and cancels the vibration. The outer control loop, as will be shown, is robust to tip mass variations. Simulations are carried...
Using a pen-type haptic device, we consider two problems of modeling and reconstructing characters, and of human learning of writing motions with the haptic aid. We first model handwritten characters by employing the so-called dynamic font method and theory of smoothing splines. Also, the calligraphic writing experiments are performed using haptic device with an idea of trajectory tracking control...
In a musculoskeletal structure, a set of internal force among muscles plays an important role. The internal force has the particular potential field. Using this property, we can control the position of a musculoskeletal system without any sensory feedback. However, the internal force can not be selected uniquely due to the muscular redundancy. This paper proposes a decision method of the internal...
Sensorless Brushless DC motors have been a research focus home and abroad, because their characteristics of small volume, high reliability, strong anti-interference and the ability to overcome inaccurate commutation caused by mechanical installation. This article will carry on a research on the operation principles and performance characteristics of sensorless DC motors and methods that terminal voltage...
The target of this paper is the pressure sensor based positioning control of the microrobot in a pulsating flow of blood vessel using an electromagnetic actuation (EMA) system. For treatment of these coronary arterial diseases, various type microrobots with a wireless locomotive actuating power using EMA were proposed. However, because the intravascular blood flows have pulsate fluctuating and high...
The article demonstrates how to generate the trajectory, taking into account the concept of the tunnel of error that ensures route trace with an error no greater than assumed, even in difficult to predict environmental conditions. The mathematical model of kinematics and dynamics using spatial vectors is presented in short. The theoretical assumptions are tested by simulation. The model used in the...
During the recording of a haptic interaction session both position and force-feedback data have to be saved. This work proposes two novel methods for haptic data compression which allow to keep the reconstruction errors during playback below human perception thresholds. Supported by well-known results from psychophysics, the first proposed non-iterative method determines the least amount of samples...
This paper presents the kinematic analysis of a new 6-DOF haptic interface and control system analysis for the tele-operation of 6-DOF serial robot. The haptic interface consists of two 3-DOF parallel structures connected with a steering handle. The design satisfies requirements of low mass moment of inertia, quick motion, big rotation, and large applied torques. Kinematics for position and differential...
The force fighting exists between active channels of redundant system, which affects the output precision, shortens operation life and leads to damage. Based on the nonlinear model of dual redundant hydraulic actuation system, this paper investigates the influences of each parameter by setting them differently in two channels and brings us guidance to reduce the force fighting in design and manufacturing...
In this paper, stable hopping of a one-legged, articulated robot with a flat foot is investigated. The robot has a special feature that before taking off, it goes through an underactuated phase in which the foot rotates about the unactuated toe on the ground. By having the underactuated phase, the robot can perform stable human-like hops with longer hopping distances. To devise a systematic trajectory...
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