Rob Dedden, TUD

Title: Residual stress estimation in piezoelectric micro pumps using admittance spectroscopy
Session: Tuesday 6 October, 15:00

Abstract

Professional printed products such as fliers, magazines, posters and topographic maps are often printed with industrial ink jet printers. Unlike the common desktop ink jet printers, the print heads in these industrial printers typically use piezoelectric actuators. Piezoelectric actuators offer better control on the ink drop formation, resulting in higher print quality. However, such print heads are usually expensive to make. In an effort to reduce the costs of the print heads, traditional production methods are being replaced with ones adopted from the semi-conductor industry. This means that the future print heads will be produced with methods similar to those applied to produce micro chips.

The challenge to apply these production methods for ink jet print heads lies in the residual stresses that remain in the print head after it has been produced. The residual stresses have an impact on the print head's mechanical properties. They have an effect on the performance, in terms of printing capability (e.g., printing speed, maximum resolution) and reliability. For this reason, a thorough understanding of the stresses is required.

A promising approach is to measure stress experimentally using admittance spectroscopy[1]. Admittance spectroscopy is a measurement technique that allows to observe the mechanical system behaviour from electrical signals obtained from the piezoelectric actuator. However, the usability depends on an accurate modelling of the print head's mechanics. The challenge of this project is to extend the use of admittance spectroscopy to estimate residual stress by improving the accuracy of the mechanical models of the print head.

[1] Preumont, A. Mechatronics Dynamics of Electromechanical and Piezoelectric
Systems, Springer, 2006, Dordrecht, The Netherlands

 

 

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