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This paper proposes a novel design method of disturbance observer (DOB) and reaction force observer (RFOB) for acceleration-based bilateral control (ABC) utilizing DC brushed motor (abbreviated as DC motor later). ABC is one of the control method to enable the transmission of haptic sensation between master and slave robots. In order to transmit highly precise haptic sensation, both DOB and RFOB are...
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, the four-channel acceleration based control with communication disturbance observer and band eliminate filter is proposed. In previous research, authors proposed 4ch ABC with BEE In this method, BEF is set on position response of slave, and this method suppresses an oscillation of position response. Therefore, position response is improved. However, this method makes the large operational...
In the research about force sensorless bilateral control using piezoelectric cantilever, nonlinearities of piezoelectric constant and creep phenomenon has not been considered in reaction force observer (RFOB). Therefore, there are room for improvement of the performance of force estimation. In this paper, piezoelectric constant and creep phenomenon are modeled based on experimental results and built...
As far as authors' understanding, scaling factors presented in this paper are the highest values in the researches about force sensorless bilateral control. The cantilever is nominalized by disturbance observer in order to control master and slave with same method, which is intended to simplify the control system. An operator can feel magnified reaction force applied to the cantilever without force...
Motion canceling bilateral control (MCBC) is a method to synchronize motion of a teleoperation robot and a target, while an operator can obtain tactile sensation of the remote target. This interface helps the operator by taking a task and reduces his/her workload. However, the delay caused by the sensors deteriorates the synchronization performance and transparency of the MCBC. Therefore, synchronization...
Bilateral control system is widely researched as a technique for robotic telesurgry, since reaction force from objects is important information for precise surgical operation. Reaction force/torque observer (RFOB/RTOB) realizes sensorless estimation of external force and it has been efficiently utilized for bilateral control. However, precise estimation of operational force is required for accurate...
A bilateral control robot is one of the master-slave teleoperation robots. Consider two robots, a master robot is manipulated by human operators and a slave robot contacts remote environment. Decoupling of a force control and a position control in bilateral control is realized using the mode transformation i.e. a force controller in the common mode and a position controller in the differential mode...
This paper describes a novel bilateral grasping control system including master-slave robots with different degree of freedom. The master and slave controllers are designed based on a multilateral control scheme. Decoupling design of force and position controllers is realized by mode transformation using the discrete Fourier transform matrices and a disturbance observer. In the proposed system, a...
Recently, minimally invasive surgery (MIS) that has some advantages has come to the front. The research on surgical robot for operational support has been actively done. To use such robots in MIS, it is needed to estimate the environmental impedance as the numerical data and to preserve it from the viewpoint of knowing the standard reference value of the safety field of internal organs and from that...
In these days, bilateral control is utilized for various scenes such as remote surgery, work in the space, nuclear plants, and so on. But in these cases, there is a dangerousness, for example a fragile organ. These environments are able to be broken or lost its plastic behavior with the excessive force. So there is a necessity to avoid this excessive force. This paper proposes a method of autonomous...
Flexible actuator which consists of a thrust wire and a linear motor realizes flexible arrangement of an actuator and an end-effector. Flexible actuator is able to transmit force sensation through a thrust wire. Thus, it is expected to be utilized in haptic motion systems. However, there is an unignorable error between the generated force of the actuators and the actual force which is transmitted...
Bilateral control enables the operator to be placed away from the working environment. Slave manipulator usually works in a remote site or in a hazardous environment. Master operator is sensing the environment through the slave manipulator. Usually if scaling is not used, master operator could feel the slave environment as it is. If the master operator should feel a feeling other than that is coming...
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