The piezoelectric print-head, which controls the droplet formation process by regulating the pressure wave in the tube with a voltage drive waveform, is an important device for droplet deposition. However, the structural deformation caused by the voltage-drive waveform is generally accompanied by structural vibration owing to the dynamic characteristics of the piezoelectric print-head. To precisely control the deformation of the print-head structure, this paper proposes a structural deformation control method for the piezoelectric print-head, based on self-sensing. This self-sensing principle is analyzed, and its measuring circuit is presented. A lumped-parameter model for the structural deformation of the piezoelectric print-head is established and its parameters are identified, based on self-sensing. An iterative learning control method for the structural deformation is presented, based on the identified system model. To verify the control effect of the proposed method, the radial displacement of a coaxial extruded piezoelectric print-head is controlled along a standard trapezoidal trajectory. The experimental results demonstrate that the structural deformation control precision of the piezoelectric print-head with the optimized drive waveform is considerably higher than that without the optimized drive waveform.
In Situ Inkjet Printing Patterned Lead Halide Perovskite Quantum Dot Color Conversion Films by Using Cheap and Eco‐Friendly Aqueous Inks[J]. Small Methods, 2020.