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Controlling the interaction between the robot and living soft tissues has became an important issue as the number of robots inside the operating room increases. Many research works have been done in order to control this interaction. Nowadays, researches are running in force control for helping surgeons in medical procedures such as motion compensation in beating heart surgeries and tele-operation...
Tendon-driven systems are one of efficient methods to downsize robots. This paper discusses application of tension control into a joint using cable differential. Cable differential is mechanism which allows two-degrees of freedom (DOF) in one joint. Controllers for the cable differential-driven joint are proposed in the paper. The joint is actuated by four linear motors. The controllers are designed...
Active exercise is one of effective therapy in rehabilitation. In this paper an exoskeleton device for active wrist rehabilitation is proposed. A force model for the wrist mechanism of DULEX-II [7] is presented, and its control system for active exercise is designed based on the force model. In experiments the performance of the force control system was verified. From the results we show a possibility...
This paper presents a novel variable impedance compact compliant series elastic actuator (SEA) design for human-friendly robotics applications. The actuator design consists of a servomotor, a ball screw, a torsional spring connecting the motor and the ball screw via a pair of spur gear, and a set of translational springs connecting the ball screw nut to the output link. The translational springs with...
In the long history of robotics research, the most prominent problem has always been, to develop robots that can safely operate in human-centered environments. One way towards the goal of a safe, and human-friendly robot, is to incorporate more and more of the flexibility that can be found in humans, by mimicking the internal mechanisms. In this work we propose a scalable joint-space control scheme...
When a grinding ring polishes free-form surfaces by a robot with multi-point machining, the polishing force would be disturbed by the changes of profile of the machined surface. In this paper, a compliant system with a passive wrist is studied when it adapts the profile of the machined curved surface by changing its posture along with the surface. Under the hybrid movement — force control policy,...
Nowadays, “user-cooperative” control strategies are commonly used in robot-assisted motor (re-)learning. User-cooperative strategies enable compliant haptic interactions between robot and user: the robot only intervenes as needed, instead of forcing the user to follow a fixed predefined movement. However, the effectiveness of user-cooperative control is controversially discussed. Recent studies indicate...
Current cardiac surgery faces the challenging problem of heart beating motion even with the help of mechanical stabilizer which makes delicate operation on the heart surface difficult. Motion compensation methods for robotic-assisted beating heart surgery have been proposed recently in literature, but research on force control for such kind of surgery has hardly been reported. Moreover, the viscoelasticity...
Robotic assistance to beating heart surgery requires high performance cardiac motion compensation in order to provide the surgeon with enhanced precision capacity. In this paper, serial comanipulation is considered, where a surgeon handles an active instrument which is in contact with the beating heart. The surgeon's hand is in charge of low frequency motions that correspond to the surgical task while...
Recent developments in cardiac catheter technology promise to allow physicians to perform most cardiac interventions without stopping the heart or opening the chest. However, current cardiac devices, including newly developed catheter robots, are unable to accurately track and interact with the fast moving cardiac tissue without applying potentially damaging forces. This paper examines the challenges...
This paper presents a study on the Design Of Experiments (DOE)-based parameter optimization technique to adapt to the manufacturing environment changes in robotic force control assembly. Based on a real-world transmission torque converter assembly production process, investigation and analysis are performed in production. An on-pendant robotic assembly parameter optimization tool is introduced. When...
Using special tools at the end-effectors of Minimally Invasive Surgery (MIS) robots has an important role in building a simple and well controlled system that increases dexterity of surgeons. Having local, lightweight and powerful actuators at end-effectors could help to simplified wrist design and saving the number of degrees-of-freedom (DOFs). Shape Memory Alloy (SMA) actuators considered as good...
This paper presents the optimal design and self-tuning fuzzy PID force control of a new 6-DOF haptic device. The haptic device is designed to select the optimal lengths of links so that requirements of workspace, force transmission ratio and singular configuration are satisfied. These requirements produce a composite global design index as a multi objective function. The indexes of optimal design...
Motion saving and playing functions are important issues of the robotic follow spot because almost all equipments in theatres are controlled by pre-defined cues. We developed a robotic follow spot and realized save-play functions of it. This paper is about the development of a robotic follow spot and about the motion save-play function realization. The robotic follow spot contains actuators, load...
The essential component of legged locomotion is control of the ground reaction force. To understand the role of the musculoskeletal body in dynamic locomotion, we investigate bipedal running using a musculoskeletal “Athlete Robot”. The configuration of the muscles in the robot is compatible with the human. The spring-like property of the human lower leg during running is modeled as an elastic blade...
In this paper, we consider leader-based shape coordination for multi-robot systems. It is shown that having knowledge about desired velocity and effective interaction among individuals can help group members to continue the path even after leader failure. Since any collective behavior emerges from interaction among individuals, we propose interactive force to maintain minimum distance among agents...
Disturbance observer is significantly becoming the preferred approach since it offers distinct advantages of improving robustness of the force control and accuracy of the force estimation. Current and velocity information are the reference inputs of the disturbance observer whereas the external force estimation is the output. Generally, velocity information without noise effects can be calculated...
This paper suggests a novel reaction force control in a robot manipulator by position feedback that is motivated by the analysis of human musculoskeletal system. First, we suggest an analogy between a muscle force characteristic and two-degree-of-freedom control input structure so that the complicated human muscle structure can be reflected in robot manipulator control. In order to clarify functions...
This paper proposes a structure for a position/force hybrid control through network. In the case of most conventional structures, each terminal controller transmits a position/force interactively. Then these terminals calculate acceleration references by themselves. In contrast, our previous research proposed a novel structure for a position/force hybrid control through network. In this approach,...
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...
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