Optimal Control and System Dynamics Analysis for Surface Mounting Device (SMD)

Research Outline

Fig.1 Surface mounting device CP60

Fig.2 Prototype of surface mounting device

The present research deals with the development of synchronizing controller for dual-drive servo system that is often used for SMD (Surface Mount Device) assembly machine. Instead of coordinating the commands to the individual feed drives and implementing closed position loop control for each axis, this work is achieved by the evaluation of an optimal cross-coupled compensator aimed specifically at improving synchronous accuracy in dual feed drives. The optimal control formulation explicitly includes the synchronous error in the performance index to be minimized. In this research, surface chip mounter is used for experiment. It demands to synchronize the positions of its two primary driving axes. The system is modeled as the first order approximation and cross-coupled optimal synchronizing controller is designed. The synchronizing control is simulated and experimented with actual system for various velocity profiles. The results show that the proposed controller reduces the synchronous error considerably, compared to the conventional uncoupled control for the dual-drive system.

Details

Fig.3 ABAQUS model for dynamics analysis

Institutes

Available Tools and Equipments

Fig.4 Block diagram of synchronizing controller

Fig.5 Simulation results of synchronous error with three different control algorithms

Fig.6 Experimental results of synchronous error with three different control algorithms

Research Vision