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System Identification of 3D Electrohydrodynamic Printer for Designing Controller for Controlling Meniscus Height Formated at the Tip of Nozzle

Abdollahi, Mohammad Ali | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52463 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahhedi, Mommad Reza; Salarieh, Hassan
  7. Abstract:
  8. 3D electrohydrodynamic printer fabricating structure and parts with micron accuracy and resolution is new technology of additional manufacturing. In this method, powerful electric field at the tip of the nozzle can change the shape of the droplet printing and can reduce droplet diameter multiple less than nozzle diameter. Couple equation such as two phase flow, gauss,the effect of various parameter like mechanical and electrical fluid properties, electric field intensity, and folw rate complicate system identification and printer controlling. While the advantages (high speed and resolution, flexibility) of e-jet printing over other fabrication methods are abundant, precise control of the process is necessary for commercialization of the technology that of course work less. Now necessary setting for different material printing was obtained experimentally and with try and error that is time-consuming process and need frequent experiment. While the main output that is to controlled is droplet dimeter, regulating meniscus specification like height provide further controllability for the system and printing error is reduced by meniscus height controlling.Although the system is not identified according to couple equation, system identification base in this research is greybox method based on printer behavior for different inputs in time and frequency domain. First the printer behavior model as second order system with doubling and softening nonlinear terms then linear and servo controller with minimum order observer is designed for controlling meniscus height and apply these controllers in simulation model in Comsol. Despite all the benefits of the results on transition state, and because of steady state error in system and dynamic change in different height range, printer behavior is modeled as piecewise linear hybrid
  9. Keywords:
  10. Electrohydrodynamic Printer ; System Identification ; State Space ; Compositional Modeling ; Controller Design ; Three Dimensional Printer

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