The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a repetitive hopping control of biped robots, which has the following properties: 1) It can initiate or cease hopping at any time, 2) The peak altitude can be freely altered during hopping, and 3) The impact at touchdown is suppressed. Hopping motions accompany frequent changes of contact conditions with the environment and lead the discontinuity of dynamics they are governed,...
In vehicle performance tests, fuel consumption, the components of exhaust gas, and mileage are measured on a chassis dynamometer that simulates the road load. It is difficult even for a professional driver to maintain speeds within the tolerance band of driving test cycles. Thus, there has long been an expectation that robotic drivers will be able to test vehicle performance with high reproducibility...
The octopus uses the arm-swimming behavior primarily for escape, defense, or foraging. This mode of locomotion is comprised of two strokes, with the arms opening slowly and closing rapidly, and generally results in considerable propulsive acceleration. In light of the recent development by our group of an octopus-like eight-arm underwater robot, we are interested to analyze the details of the biological...
A model predictive controller is developed for following the position of a human dancer in robot ballroom dancing. The control design uses a dynamic model of a dancer, based on a variant of the so-called 3D Linear Inverted Pendulum Mode that includes also the swing foot. This model serves as a basis for a Kalman predictor of the human motion during the single-support phase, while a simpler kinematic...
Tracking a desired trajectory in joint space has been favored in several robot manipulators and end-effector control scheme due to the simplicity and high sampling rate offered by the joint space scheme. This usually require the trajectory conversion process, of the desired position, velocity, and acceleration, from Cartesian space to joint space using conventional inverse kinematics solutions which...
We propose a new extend function for Rapidly-Exploring Randomized Tree (RRT) algorithms that expands along a curve, obeying velocity and acceleration limits, rather than using straight-line trajectories. This results in smooth, feasible trajectories that can readily be applied in robotics applications. Our main focus is the implementation of such methods on Ro-boSimian, a quadruped robot competing...
Humanoids locomote by making and breaking contacts with their environment. Thus, a crucial question for them is to anticipate whether a contact will hold or break under effort. For rigid surface contacts, existing methods usually consider several point-contact forces, which has some drawbacks due to the underlying redundancy. We derive a criterion, the Contact Wrench Cone (CWC), which is equivalent...
This paper proposes a novel approach to generate trajectories that generalize given demonstrations according to optimality criteria. By formulating the problem as a quadratic program we can efficiently incorporate constraints to adapt to new desired motion requirements while achieving the main goal of matching the acceleration profile of the demonstration. This makes our method particularly suited...
In this paper, the application of an impedance control scheme to drive a robot with a desired force profile in the presence of non-rigid environments is considered. Fine force control obtained with the usual impedance based control schemes reveal some difficulties especially for non-rigid environments. Moreover, robot dynamic model and environmental uncertainties, can seriously affect the force tracking...
Speed up movement to increase productivity may cause problems such as vibration. This paper proposes a vibration suppression tool with visual graphical interface to solve the vibration problem based on input shaping approach. The proposed tool was then applied in real industry processes to solve the vibration problems of semiconductor wafer transfer robot and gantry loader in high speed operation...
A computationally effective trajectory generation algorithm of omnidirectional mobile robots is proposed. The algorithm plans a reference path based on Bézier curves for obstacle avoidance. Then the algorithm solves the problem of motion planning for the robot to track the path in a short travel time while satisfying dynamic constraints and robustness to noise. The numerical simulation demonstrates...
In past decades, the online solution of inverse kinematics (IK) has always been a mathematically troublesome problem for redundant robot manipulators. Besides, the traditional IK approaches, such as the pseudo-inverse method, have to calculate the computationally expensive inverse (specifically, pseudo-inverse) of Jacobian matrix. To drastically and effectively avoid the Jacobian inversion and to...
This paper presents evaluation methods to evaluate 2 types of stroke paralysis quantitatively. Recently, aging of the population and declining birthrate is progressing in the developed countries. Along with it, the number of stroke patients is expected to increase because of its high disease rate of the elderly, and rehabilitation system by using robot technology is being focused. In order to perform...
Recently, motion control strategies that deal with position and force information simultaneously are attraction attention for human support. Acceleration control is one of the candidates for realizing position control and force control simultaneously. In this paper, the motion-copying system based on acceleration control is in focus. The motion-copying system is the system which stores human motion,...
In this paper, a design method of frequency-domain damping(FDD) to improve stability is proposed. In recent days, haptics is one of major topics in robotics field. Especially tele-operation with haptic feedback has been studied for long years, but problem of time delay still exists. Time delay causes three problems : operational force, oscillating motion, and degrading of contact stability. To solve...
Recently, robots have been increasing demand for elderly care problem, dangerous work involved in life, disappearing skilled work and so on. To use robots like human, human motion information is needed to obtain. The motion information is also needed to analyze in order to use effectively information. In this paper, motion information is extracted by motion-copying system. Motion-copying system is...
The acceleration based force control is very important component in motion control. Looking ahead the development of the robotics system in the future, realization with high accuracy of the force control is essential. Since it is controlled so as to follow the external environment, the control performance completely depends on an impedance of the contact object. In generally, the velocity feedback...
This paper analyzes the stability of acceleration-based bilateral control (ABC) using a disturbance observer (DOB) and a reaction force observer (RFOB) by considering the effect of environmental impedance and modeling error. ABC is one of the control method to enable highly precise transmission of haptic sensation between master and slave robots. Conventionally, ABC is analyzed by using slave side...
In this paper, force-based control scheme for stable contact motion is proposed. In recent days, haptics is one of major topics in robotics field. Especially teleoperation with haptic feedback has been studied for long years, but problem of time delay still exists. Time delay causes three problems : operational force, oscillating motion, and degrading of contact stability. Some conventional approaches...
In this paper, the complex aspect of deburring of machined components while using a Selective Compliance Assembly Robot Arm (SCARA) robot is analyzed. There are two practices followed in robotic deburring, viz., the work piece is held by the robot's gripper while the deburring tool is external to the robot and the second mode, the deburring tool is held by the gripper with the work piece is held in...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.