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Wire-driven haptic devices can easily achieve highspeed operation because of the low inertia of light and thin wires. Therefore, it is expected to be widely used as a motion support system in fields such as sports training. However, usually these wires are driven by controlling each wire's tension using servo motors, which raises concerns about the safety in human-robot interaction. Thus, we propose...
In this paper, we propose a method to estimate the geometrical relationships between servo-brake-controlled caster units arbitrarily located on a moving base. The method utilizes only the velocity information of each caster unit and recursively estimates the pose of the caster units by the extended Kalman filter. In the state estimation problem, the estimation performance depends on the quality of...
In this study, we present a new type of wheelchair called the cycling wheelchair, in which the user moves the wheelchair by pedaling with his/her legs and changes direction using a steering handle. This wheelchair has great potential not only as an effective rehabilitation device but also as a mobility assistive device. However, the commercially available model has several hardware limitations that...
In this study, we propose a cycling wheelchair that assists the movement of patients with impairment of lower extremities. The wheelchair is a pedal-driven system, similar to a bicycle, moved by the pedaling force of the patient's legs. Although the lower extremities of patients are impaired, they can use both legs to smoothly rotate the pedal. However, there are several barriers to use the cycling...
In this paper, we propose a passive wire-type motion support system to guide a human hand through the use of servo brakes. This system is intrinsically safe because servo brakes cannot generate a driving force to control the system. On the other hand, this system may not generate sufficient force to guide the human hand along the desired path because of the use of servo brakes. To resolve this problem,...
In this paper, we develop a passive wire-type motion support system controlled by servo brakes to assist human motion in the fields of rehabilitation and sports training. We also propose a control method to guide the human hand by using the servo brakes which cannot generate a driving force. This passive system is intrinsically safe and wire-type motion support system has a wide operating range. But,...
The motion of a passive type walker is controlled so that it can be used as a support for standing up, sitting down and also to prevent the user from falling down. A depth vision sensor is used to locate the centroid of the user's upper body. A 2D probabilistic model of the location of the centroid is constructed based on the gathered data of the user during normal walking. A set of statistical normality...
We introduce passive mobile robots consisting of various wheels; omnidirectional wheels or one-wheel casters, which are controlled by servo brakes. These robots can realize several functions, such as path tracking, gravity compensation on a slope, and collision avoidance function, by controlling only the servo brakes. They employ passive dynamics with respect to the force applied by a human. In this...
To assist human motion in the fields of rehabilitation and sports training, we propose a passive motion support system consisting of wires with servo brakes and a control method to guide the human hand. However, passive systems sometimes cannot generate enough force to guide the human hand along the desired path because the servo brakes cannot generate a driving force and the system does not have...
In this paper, the control algorithm of a female type dance partner robot called PDR was introduced to achieve dance between the robot and a male dancer with physical interaction. PDR is a passive type mobile robot and developed based on the concept of passive robotics. Firstly, the characteristics of servo brake were analyzed, according to the kinematic model and control constraint condition, the...
This paper proposes a distributed motion control algorithm of multiple passive mobile robots for handling an object in cooperation with a human. The driving force of the passive mobile robot is an actual force applied by the human and the servo brakes attached to the wheels control its motion. Different from the active-type robot with servo motors, the passive robot has the control limitation based...
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