scholarly journals Decentralized Control of Distributed Actuation in a Segmented Soft Robot Arm

Author(s):  
Azadeh Doroudchi ◽  
Sachin Shivakumar ◽  
Rebecca E. Fisher ◽  
Hamid Marvi ◽  
Daniel Aukes ◽  
...  
2018 ◽  
Vol 3 (1) ◽  
pp. 108-115 ◽  
Author(s):  
Y. Ansari ◽  
M. Manti ◽  
E. Falotico ◽  
M. Cianchetti ◽  
C. Laschi

Robotics ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 72 ◽  
Author(s):  
Alaa Al-Ibadi ◽  
Samia Nefti-Meziani ◽  
Steve Davis ◽  
Theo Theodoridis

This article presents a novel design of a continuum arm, which has the ability to extend and bend efficiently. Numerous designs and experiments have been done to different dimensions on both types of McKibben pneumatic muscle actuators (PMA) in order to study their performances. The contraction and extension behaviour have been illustrated with single contractor actuators and single extensor actuators, respectively. The tensile force for the contractor actuator and the compressive force for the extensor PMA are thoroughly explained and compared. Furthermore, the bending behaviour has been explained for a single extensor PMA, multi extensor actuators and multi contractor actuators. A two-section continuum arm has been implemented from both types of actuators to achieve multiple operations. Then, a novel construction is proposed to achieve efficient bending behaviour of a single contraction PMA. This novel design of a bending-actuator has been used to modify the presented continuum arm. Two different position control strategies are presented, arising from the results of the modified soft robot arm experiment. A cascaded position control is applied to control the position of the end effector of the soft arm at no load by efficiently controlling the pressure of all the actuators in the continuum arm. A new algorithm is then proposed by distributing the x, y and z-axis to the actuators and applying an effective closed-loop position control to the proposed arm at different load conditions.


2020 ◽  
Vol sceeer (3d) ◽  
pp. 25-29
Author(s):  
Alaa Al-Ibadi

This paper presents a simple and fast design and implementation for a soft robot arm. The proposed continuum arm has been built by a single self-bending contraction actuator (SBCA) with two-fingers soft gripper. Because of the valuable advantages of the pneumatic artificial muscle (PAM), this continuum arm provides a high degree of safety to individuals. The proposed soft robot arm has a bending behaviour of more 180° at 3.5 kg, while, its weight is 0.7 kg. Moreover, it is designed to assist the people by reducing the number of backbends and that leads to a decrease in the possibility of lower back pain.


2018 ◽  
Vol 23 (6) ◽  
pp. 2726-2738 ◽  
Author(s):  
Fan Xu ◽  
Hesheng Wang ◽  
Kwok Wai Samuel Au ◽  
Weidong Chen ◽  
Yanzi Miao

2021 ◽  
Vol 10 (1) ◽  
pp. 34
Author(s):  
Yoshie Yamamoto ◽  
Shuichi Wakimoto ◽  
Takefumi Kanda ◽  
Daisuke Yamaguchi

In our study, a soft robot arm consisting of McKibben artificial muscles and a silicone rubber structure was developed. This robot arm can perform bending and twisting motions by ap-plying pneumatic pressure to the artificial muscles. The robot arm is made of flexible materials only, and therefore it has high flexibility and shape adaptability. In this report on the fundamental investigation of the master–slave feedback control of the soft robot arm for intentional operation, we focus on the bending motion of the soft robot arm. Three flexible strain sensors were placed on the soft robot arm for measuring the bending motion. By establishing a master–slave feedback system using the sensors, the bending motion of the soft robot arm followed the operator’s wrist motion detected via the wearable interface device.


2012 ◽  
Vol 26 (7) ◽  
pp. 709-727 ◽  
Author(s):  
Cecilia Laschi ◽  
Matteo Cianchetti ◽  
Barbara Mazzolai ◽  
Laura Margheri ◽  
Maurizio Follador ◽  
...  
Keyword(s):  

2019 ◽  
Vol 24 (3) ◽  
pp. 979-989 ◽  
Author(s):  
Fan Xu ◽  
Hesheng Wang ◽  
Jingchuan Wang ◽  
Kwok Wai Samuel Au ◽  
Weidong Chen

Information ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 310
Author(s):  
Qiuxuan Wu ◽  
Yueqin Gu ◽  
Yancheng Li ◽  
Botao Zhang ◽  
Sergey A. Chepinskiy ◽  
...  

The cable-driven soft arm is mostly made of soft material; it is difficult to control because of the material characteristics, so the traditional robot arm modeling and control methods cannot be directly applied to the soft robot arm. In this paper, we combine the data-driven modeling method with the reinforcement learning control method to realize the position control task of robotic soft arm, the method of control strategy based on deep Q learning. In order to solve slow convergence and unstable effect in the process of simulation and migration when deep reinforcement learning is applied to the actual robot control task, a control strategy learning method is designed, which is based on the experimental data, to establish a simulation environment for control strategy training, and then applied to the real environment. Finally, it is proved by experiment that the method can effectively complete the control of the soft robot arm, which has better robustness than the traditional method.


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