J. TU
Professor

Education
Ph.D., University of Michigan, 1991
M.S., National Tsing-Hua University, 1983
B.S., National Taiwan University, 1981

Research Interests
Laser material processing, high speed machining/spindle technology, precision engineering, mechatronics, modeling, monitoring, and control of dynamic systems

Selected Publications
Lankalapalli, K.*, Tu, J.F.*, and Gartner, M., 1996, “A Model for Estimating Penetration Depth of Laser Welding Processes,” Journal of Physics, D:Applied Physics, 29:1831-1841.

Tu, J.F.*, Bossmanns, B.*, and Hung, S.C-C., 1997, “Modeling and Error Analysis for Assessing Spindle Radial Error Motions,” Journal of the American Society for Precision Engineering, 21:90-101.

Corless, M.* and Tu, J.F.*, 1998, “State and Disturbance Estimation for a Class of Uncertain Systems,” Automatica, 34(6):757-764.

Lankalapalli, K.N.*, Tu, J.F.*, Leong, K.H., and Gartner, M., 1999, “Laser Weld Penetration Estimation Using Temperature Measurements,” Transactions American Society of Mechanical Engineers Journal of Manufacturing Science and Engineering, 121:179-188.

Bossmanns,B.* and Tu, J.F.*, 1999, “A Thermal Model for High-speed Motorized Spindles,” International Journal of Machine Tools and Manufacture, 39:1345-1366.

Bossmanns,B.* and Tu, J.F.*, 2001, “A Power Flow Model for High-speed Motorized Spindles – Heat Generation Characterization,” American Society of Mechanical Engineers Journal of Manufacturing Science and Engineering, 123(3):494-505.

Cho, N.* and Tu, J.F.*, 2001, “Roundness Modeling of Machined Parts for Tolerance Analysis,” Journal of International Society for Prevision Engineering and Nanotechnology, 25:35-47.

Tu, J.F.*, Miyamoto, I.*, and Inoue, T., 2002, “Characterizing Keyhole Plasma Light Emission and Plasma Plume Scattering for Monitoring 20kW-Class CO2 Laser Welding Processes,” Journal of Laser Applications, 14(3): 146-153.

Cho, N.,* and Tu, J.F.*, 2002, “Quantitative Circularity Tolerance Analysis and Design for 2D High Precision Assemblies,” International Journal of Machine Tools and Manufacture, 42(13): 1391-1401.

Tu, J.F.*, Inoue, T., and Miyamoto, I., 2003, “Quantitative Characterization of Keyhole Absorption Mechanism in 20 kW-Class CO2 Laser Welding Processes,” Journal of Physics, D: Applied Physics, 36:192-203.

Lin, C-W.*, Tu, J.F.*, and Kamman, J., 2003, “Characterizing High-speed Thermo-Mechanical-Dynamic Behaviors of Motorized Machine Tool Spindles,” International Journal of Machine Tools and Manufacture, 43(10): 1035-1050.

Tu, J.F. *, Corelss, M., and Jeppsson, J., 2004, “Robust Control of High Speed End Milling with Unknown Process Parameter and CNC Delay,” Journal of Aerospace Engineering,17(1): 1-9.

Nakkiew, W, Lin, C.W, and J.F., Tu, “Spindle Runout Measurements at Very High Speed Rotation,” International Journal of Machine Tools and Manufacture (In Press).

Resumé