Abstract: A new type of piezostack-driven jetting dispenser was proposed which used hydraulic magnification, and analyzed its injection process and injection condition. The open loop model of dispensing system was built by AMESim software. The simulation proved the feasibility. The closed loop control system with PID (Proportion Integration Differentiation) algorithm was set up to improve performance of open loop dispensing system, and the open and closed loop control performance was compared under the simulation environment. Analysis shows that PID closed loop system can improve performance of piezostack-driven jetting dispensing system. When nozzle diameter is 0.1mm and syringe pressure is 8 bar, by closed loop control, the achieved average flow rate is 0.023L/min and the minimum diameter of stable droplets is 0.8 mm.

Key words: piezoelectric driven, AMESim simulation, jet dispensing, hydraulic magnification