Dr. Faxin X. Li Profile

Dr. Faxin X. Li

at Univ of British Columbia

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Proceedings Article | 9 April 2007 Paper

Dynamic thermo-electro-mechanical performance of piezoelectric stack actuators

M. Senousy, F. Li, D. Mumford, M. Gadala, R. K. N. D. Rajapakse

Proceedings Volume 6526, 652609 (2007) https://doi.org/10.1117/12.715363

KEYWORDS: Actuators, Temperature metrology, Lithium, Combustion, Ferroelectric materials, Ceramics, Sensors, Control systems, Head, Signal generators

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Piezoelectric actuators are increasingly used in modern fuel injectors due to their quick response, high efficiency, and excellent repeatability. Current understanding of the thermo-electro-mechanical performance of piezoelectric actuators under dynamic driving fields is very limited. In this paper, the dynamic thermo-electro-mechanical performance of Lead Titanate Zirconate (PZT) stack actuators is experimentally studied over the temperature range of -30 °C to 80 °C, under a driving field of up to 2.4 kV/mm (with an AC drive method) and a constant preload of about 5MPa. Sinusoidal and trapezoidal driving fields with rise times varying from 0.1 ms to 2 ms are applied. It is found that dynamic stroke increases steadily with the temperature. Under driving frequencies lower than the resonance frequency of the testing system ( ≈ 500Hz), the electric field-strain behavior under different temperatures is very similar to the quasi-static results obtained previously. In the case of a trapezoidal pulse, decreasing the rise time is found to be equivalent to increasing the frequency.

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