کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
732542 | 893251 | 2007 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Time-optimal motion planning and control of an electrohydraulically actuated toggle mechanism Time-optimal motion planning and control of an electrohydraulically actuated toggle mechanism](/preview/png/732542.png)
The aim of this paper is to significantly reduce the cycle time of an injection molding machine by operating its clamping unit with minimum time. Therefore, a two-step control concept is presented. First, time-optimal trajectories are planned with respect to the kinematic and dynamic restrictions of the toggle mechanism. Formulating the time-optimal problem as a linear program allows the consideration of nonconstant velocity and acceleration limits as well as jerk constraints for the actuating piston. Second, a nonlinear control scheme based on feedback linearization is introduced to guarantee the time-optimal movement of the toggle mechanism. The proposed nonlinear controller possesses a cascade structure and considers the different modes of the clamping unit’s hydraulic system as well as the clamping force build-up of the clamping unit. The simulation and measurement results presented in the paper show significant improvements compared to an existing open-loop control concept.
Journal: Mechatronics - Volume 17, Issue 8, October 2007, Pages 448–456