Force control of a two-arm robot manipulating a deformable object

Author(s):  
Xavier Delebarre ◽  
Eric Dégoulange ◽  
Pierre Dauchez ◽  
Yann Bouffard-Vercelli
2012 ◽  
Vol 157-158 ◽  
pp. 1190-1194
Author(s):  
Khairul Salleh Mohamed Sahari ◽  
Hiroaki Seki

Edge tracing is considered important for deformable object manipulation in order to spread and reveal the original shape of an object before it can be sorted. This paper proposes a unique tracing method for t-shirt spreading by robots. Tracing in this paper context involves tracing the edge of the t-shirt, with the robot arm movement based on feedback from sensors. Adequate force control is also applied to the tracing gripper during tracing so that it doesn't grip the fabric too hard or vice versa which can affect the performance of the robot. Vision sensor is used from time to time to check whether the tracing gripper has reached a corner or not. Based on the algorithm used for towel spreading, algorithm for edge tracing of shirt to find a second or third corner is proposed. The method is simply looking at possibilities of tracing through corners, changing tracing trajectory as well as tracing on two layers of fabric. Practical experiments were conducted to evaluate the proposed method.


2011 ◽  
Vol 23 (3) ◽  
pp. 458-461 ◽  
Author(s):  
Khairul Salleh Mohamed Sahari ◽  
◽  
Hiroaki Seki ◽  
Yoshitsugu Kamiya ◽  
Masatoshi Hikizu ◽  
...  

Usage of active tracing method to find a second corner has been proven to be efficient in finding a second corner next to the first found corner. Passive tracing is a method where the tracing gripper is static while another gripper holding the first corner maneuvers according to the feedback from sensors inside the static gripper so that it pulls the clothes appropriately for the static gripper, with adequate force control, to trace the edge of the clothes. Vision sensor is used from time to time to check whether the static gripper has reached the second corner or not.


2008 ◽  
Vol 35 (S 01) ◽  
Author(s):  
Y Li ◽  
J Randerath ◽  
G Goldenberg ◽  
J Hermsdörfer

2005 ◽  
Vol 32 (S 4) ◽  
Author(s):  
F Kirsten ◽  
S Bohlen ◽  
J Sommer ◽  
T Merl ◽  
P Saemann ◽  
...  

Author(s):  
K. Shibazaki ◽  
H. Nozaki

In this study, in order to improve steering stability during turning, we devised an inner and outer wheel driving force control system that is based on the steering angle and steering angular velocity, and verified its effectiveness via running tests. In the driving force control system based on steering angle, the inner wheel driving force is weakened in proportion to the steering angle during a turn, and the difference in driving force is applied to the inner and outer wheels by strengthening the outer wheel driving force. In the driving force control (based on steering angular velocity), the value obtained by multiplying the driving force constant and the steering angular velocity,  that differentiates the driver steering input during turning output as the driving force of the inner and outer wheels. By controlling the driving force of the inner and outer wheels, it reduces the maximum steering angle by 40 deg and it became possible to improve the cornering marginal performance and improve the steering stability at the J-turn. In the pylon slalom it reduces the maximum steering angle by 45 deg and it became possible to improve the responsiveness of the vehicle. Control by steering angle is effective during steady turning, while control by steering angular velocity is effective during sharp turning. The inner and outer wheel driving force control are expected to further improve steering stability.


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