Author or co-author have published over 30 research papers. Offered a new numerical method to study thermoacoustic problems (ref.1). Given a proof of the equivalence between the energy velocity and the group velocity for waves in piezoelectrics and under orther conditions (refs.4,5). Built a traveling ring ultrasonic motor with the output torque of over 4 NM that is the largest torque for this type of motor. Selected Papers 1. Chen Y., Liu X., Zhang X-Q, etal, Thermoacoustic Simulation with Lattice Gas Automata, J. Applied Physics, April 15, 2004. 2. Chen Yu, Guo L-H, On group velocity of elastic waves in an anisotropic plate, J. Sound and Vibration,V254(4), 727, 2002 3. Chen Y, Zhou TY, Zhang Q, etal,A study on the friction of a self- correction ultrasonic stepping motor, J. Ultrasonics, V39, 667, 2002 4. Chen Yu,Group and energy velocities of acoustic surface waves in piezoelectrics, Phys. Rev. B V.54, p1561,1996 5. Chen Yu,Energy velocity and group velocity, Science in China, A V.38, p65, 1995 |