Jiashi Yang

Jiashi Yang

Jiashi Yang
Contact Information:
W317.5 NH
Lincoln: City Campus
(402) 472-0712
Email   

Associate Professor
  • Princeton University, Princeton, N.J., Ph.D. in Civil Engineering and Operations Research (1994)
  • Syracuse University, Syracuse, N.Y., M.S. in Mechanical Engineering (1988)
  • Tsinghau University, Beijing, China, M.S. in Engineering Mechanics (1985)
  • Tsinghau University, Beijing, China, B.S. in Engineering Mechanics (1982)

Areas of Research and Professional Interest
  • Frequency stability of piezoelectric crystal resonators under the support of the Army Research Office

About Jiashi Yang

The research of Professor Yang's group is on frequency stability of piezoelectric crystal resonators under the support of the Army Research Office. Piezoelectric resonators are essential components for radios, phones, satellites, sensors and other equipment for time keeping, control, and telecommunication. They are usually made from quartz. Recently, new single crystals of langasite (La3Ga5SiO14) and certain of its isomorphs (langanite and langatate) have shown great promise as future materials for piezoelectric resonators.

The operating frequency of piezoelectric resonators can be affected by various environmental effects like temperature change and accelerations which are relevant when resonators are mounted on moving objects. The study of resonator frequency stability requires a nonlinear formulation. Nonlinear material constants of new piezoelectric crystals are being measured and are used in frequency stability analysis of resonators.

Selected Publications

Publications:
  • J. S. Yang, H. Xue, H. Y. Fang, Y. T. Hu, J. Wang and L. J. Shen, Effects of electrodes with varying thickness on energy trapping in thickness-shear quartz resonators, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 892-895, 2007.
  • J. S. Yang, J. J. Liu and J. Y. Li, Analysis of a rectangular ceramic plate in electrically forced thickness-twist vibration as a piezoelectric transformer, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 830-835, 2007.
  • J. S. Yang, Comment on Y.-H. Hsu et al., “Electrical and mechanical fully coupled theory and experimental verification of Rosen-type piezoelectric transformers” Ultrason., Ferroelect., Freq. Contr., 54, 699-670, 2007.
  • J. S. Yang, Z. G. Chen and Y. T. Hu, Mass sensitivity of thickness-twist modes in a rectangular piezoelectric plate of hexagonal crystals, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 882-887, 2007.
  • J. S. Yang, Z. G. Chen and Y. T. Hu, Propagation of thickness-twist waves through a joint between two semi-infinite piezoelectric plates, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 888-891, 2007.
  • J. S. Yang, Z. G. Chen, Y. T. Hu, S. N. Jiang and S. H. Guo, Weakly nonlinear behavior of a plate thickness mode piezoelectric transformer, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 877-881, 2007.
  • J. Wang, J. S. Yang and J. Y. Li, Energy trapping of thickness-shear vibration modes of elastic plates with functionally graded materials, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 687-690, 2007.
  • J. S. Yang, Z. G. Chen and Y. T. Hu, Theoretical modeling of a thickness-shear circular cylinder piezoelectric transformer, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 621-626, 2007.
  • J. S. Yang, Thickness-twist edge modes in a semi-infinite piezoelectric plate of crystals with 6mm symmetry, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 220-221, 2007.
  • J. S. Yang, Z. G. Chen and Y. T. Hu,An exact analysis of a rectangular plate piezoelectric generator, IEEE Trans. Ultrason., Ferroelect., Freq. Contr., 54, 190-195, 2007.
Books:

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