Abstract
Piezoelectric actuators are increasingly used in fuel injectors. Experimental results for soft Lead Zirconate Titanate (PZT) actuators have shown that a significant amount of heat is generated when they are driven under high frequency and/or high electric-field magnitudes, both of which occur in fuel injectors. They also exhibit hysteretic nonlinear behavior when driven under high electric-field magnitudes. A mathematical model for self-heating that accounts for different controlling parameters relevant to fuel injection is developed in this paper, as well as a domain-switching model for PZT materials. The switching model is based on changes in potential energy, and accounts for full thermo-electro-mechanical coupling and the effect of temperature on domain switching. It is assumed that 180∘switching is a two-step process caused by two 90∘domain switching occurrences. The model shows good agreement with experimental results at different temperatures.
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Acknowledgements
This research was supported by a grant from the Natural Sciences and Engineering Research Council (NSERC) of Canada, with substantial in-kind support provided by Westport Power Inc.
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Senousy, M.S., Rajapakse, R.K.N.D., Gadala, M. (2011). Experimental Investigation and Theoretical Modeling of Piezoelectric Actuators Used in Fuel Injectors. In: Kuna, M., Ricoeur, A. (eds) IUTAM Symposium on Multiscale Modelling of Fatigue, Damage and Fracture in Smart Materials. IUTAM Bookseries, vol 24. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9887-0_21
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DOI: https://doi.org/10.1007/978-90-481-9887-0_21
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