Department of Mechanical and Aerospace EngineeringOUR PEOPLE
Lilong CAI 蔡李隆
PhD, Toronto
Professor of Mechanical and Aerospace Engineering



Professor Cai has been engaged in the research of mechatronics, metrology, control of nonlinear systems and robotics for many years. He is a member of IEEE. Before joining HKUST, he was an assistant professor of mechanical engineering at Columbia University in New York City, USA (1990-1993).

Teaching Activities

MECH3610 Control Principles
MECH 4710                             Introdcution to Robtics

Research Interests

Mechtronics
Control of nonlinear systems
Robotics
Sensors and instrumentation
 

PATENTS

  • L. Cai and J. Zhang , “Interferometer Systems for Straightness Measurement”, US Patent, No. 5757491, May 26, 1998.
  • L. Cai and J. Zhang , “Auto-focus Laser Encoder Having Three Light Beams and a Reflective Grating”, US Patent, No. 5825023, October 20, 1998.;
  • L. Cai and W. Zhou , “Positioning Apparatus for Hard Disk Servo-writer”, US Patent No. 6,191,911B1, Feb. 20, 2001.
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Selected Publications

  • Wang X. and Cai LL, “ Mathematical modeling and control of a tilt-rotor aircraft”, Aerospace Science and Technology, vol. 47, no. 12, 2015, 473-492.
  • Zhou K,Yao P; Cai LL,”Constant current vs. constant power control in AC resistance spot welding”, JOURNAL OF MATERIALS PROCESSING TECHNOLOGY Volume: 223 Pages: 299-304 Published: SEP 2015
  • Zhou K , Cai LL “An Algorithm for Calculating the RMS Value of the Non- Sinusoidal Current Used in AC Resistance Spot Welding”, Journal of Power Electronics, Vol. 15, No. 4, pp. 1139-1147, July 2015
  • Zhou K , Cai LL "Study on effect of electrode force on resistance spot welding process", JOURNAL OF APPLIED PHYSICS, Volume: 116(8), 084902,August 28 2014,doi: 10.1063/1.4893968
  • Zhou K , Cai LL, “On the development of nugget growth model for resistance spot welding”, JOURNAL OF APPLIED PHYSICS, Volume: 115, Issue: 16, Article Number: 164901, Published: APR 28 2014.
  • Zhou K , Cai LL, “A Nonlinear Current Control Method for Resistance Spot Welding”, IEEE-ASME TRANSACTIONS ON MECHATRONICS, Volume: 19, Issue: 2, Pages: 559-569, Published: APR 2014.
  • Zhou K , Cai LL, “Study of safety operation of AC resistance spot welding system”, IET POWER ELECTRONICS, Volume: 7, Issue: 1, Pages: 141-147 Published: JAN 2014.
  • Zhou K , Cai LL, “Online Measuring Power Factor in AC Resistance Spot Welding”, IEEE TRANSACTIONS ON INDUSTRIALELECTRONICS, Volume: 61, Issue: 1, Pages: 575-582, Published: JAN 2014.
  • Zhou K , Cai LL, “Online nugget diameter control system for resistance spot welding”, International Journal Advanced Manufacturing Technology, volumn 68, issue 9-12, pp:2571–2588, October, 2013
  • Ren ZG , Liao JR , Cai LL, “An algorithm to estimate the crown patterns of diamonds based on machine vision”, Machine Vision and Applications (2012) Vol. 23, No. 2, pp. :197–215. DOI 10.1007/s0013-011-0354-8
  • Ren ZG , Liao JR , Cai LL, “Three-dimensional measurement of small mechanical parts under a complicated background based on stereo vision”, APPLIED OPTICS Volume: 49 Issue: 10 Pages: 1789-1801 Published: APR 1 2010
  • Zuo W , Cai LL, “A New Iterative Learning Controller Using Variable Structure Fourier Neural Network”, IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS, Volume: 40 Issue: 2 Pages: 458-468 Published: APR 2010
  • Ren ZG , Cai LL, “Three-dimensional structure measurement of diamond crowns based on stereo vision”, APPLIED OPTICS Volume: 48 Issue: 31 Pages: 5917-5932, NOV 1 2009.
  • Zuo W , Zhu Y , Cai LL, “Fourier-Neural-Network-Based Learning Control for a Class of Nonlinear Systems With Flexible Components”, IEEE TRANSACTIONS ON NEURAL NETWORKS Volume: 20 Issue: 1 Pages: 139-151, JAN 2009.
  • Zuo W , Cai LL, “Adaptive-Fourier-Neural-Network-Based Control for a Class of Uncertain Nonlinear Systems”, IEEE TRANSACTIONS ON NEURAL NETWORKS Volume: 19 Issue: 10 Pages: 1689-170, OCT 2008.
  • Mei W. , V. Li and Cai LL “Application of Finite Element Analysis in the Simulation of Spot Welding Process” Engineering Journal of WuHan University, pp. 94-99, Vol. 39, 2006. (ISSN 1671-8844)
  • Yuan XH , Cai LL “Variable amplitude Fourier series with its application in gearbox diagnosis - Part I: Principle and simulation”, Mechanical Systems and Signal Processing 19 (5): 1055-1066 SEP 2005.
  • Yuan XH , Cai LL “Variable amplitude Fourier series with its application in gearbox diagnosis - Part II: Experiment and application”, Mechanical Systems and Signal Processing 19 (5): 1067-1081 SEP 2005.
  • Peng X , Zhang, P and Cai LL “Information security system based on virtual-optics imaging methodology and public key infrastructure”, Optik 115 (9): 420-426 2004.
  • Yu LF , An YF , Cai LL “Numerical reconstruction of digital holography with changed viewing angles", Journal of Electronics Imaging 13 (4): 814-818 OCT 2004.
  • Yu LF , LL Cai, “ Data encryption by disarranging the holographic information with rotated holograms” Optik 114 (11): 497-503 2003.
  • Peng X , Yu LF and LL Cai, “Digital watermarking in three-dimensional space with a virtual-optics imaging modality”, Opt. Commun, 226 (1-6): 155-165 OCT 15 2003
  • Peng , Z. Cui , L. Cai, and L. Yu , “Digital audio signal encryption with a virtual optics scheme,” Optik, Vol. 114, pp. 69-75, 2003.
  • L. Yu and LL Cai, “Multidimensional Data Encryption with Digital Holography,” Opt. Commun, Vol. 215 (4-6), pp. 271-284, 2003.
  • CF Lo , X Peng and LL Cai, “Surface normal guided method for two-dimensional phase unwrapping,” Optik (International Journal for Light and Electron Optics), Vol. 113 (10): pp. 439-447, 2002.
  • Zhang HG and LL Cai, “Decentralized nonlinear adaptive control of an HVAC system,” IEEE Transaction on Systems, Man, and Cybernetics, Part C:, Vol. 32(4):pp. 493-498, Nov., 2002.
  • L. Yu , Y. An , and L. Cai, "Numerical reconstruction of digital holograms with variable viewing angles," Opt. Express Vol. 10(11), pp. 1250-1257 (2002).
  • Zhang HG and LL Cai, “Nonlinear adaptive control using the Fourier integral and its application to CSTR systems,” IEEE Transaction on Systems, Man, and Cybernetics, Part B: Cybernetics,, Vol. 32 (3): pp. 367-372 JUN 2002.
  • Yu LF , Peng, X and LL Cai, “Parameterized multi-dimensional data encryption by digital optics,” Opt. Commun., Vol. 203 (1-2): pp. 67-77 MAR 1, 2002.
  • Zhang HG , Li M and LL Cai, “Fuzzy adaptive control of nonlinear processes with feed forward compensator and its application’” Cybernet Sys, Vol. 33 (2): 171-187, 2002.
  • Peng, X , Yu LF and Cai LL, “Double-lock for image encryption with virtual optical wavelength”, Opt. Express, Vol. 10 (1): pp. 41-45 JAN 14, 2002.
  • Zhang HG and L Cai, “Multivariable fuzzy generalized predictive control”, Cybernet Syst, Vol. 33 (1): pp. 69-99 JAN-FEB 2002.
  • L. Yu and L. Cai, “An iterative algorithm with a constraint condition for numerical reconstruction of a 3-D object from its hologram”, Journal of the Optical Society of America A, Vol. 18, No. 5, pp. 1033-1045, May, 2001.
  • W. Zhou and L. Cai, “Zero and direction reference mark based on phase jump”, Optical Engineering, Vol. 40, No. 2, pp. 289-294, Feb. 2001.
  • H. Zhang, L. Cai and Z. Bien , “A multivariable generalized predictive control approach based on T-S fuzzy model”, Int. Journal of Intelligent & Fuzzy Systems, Vol., 9 No. 3-4, pp. 169-189, 2000.
  • W. Huang and L. Cai, “New hybrid controller for systems with deterministic uncertainties”, Journal of IEEE/ASME Transaction on Mechatronics, Vol. 5, No. 4, pp. 342-348, Dec. 2000.
  • L. Cai and W. Huang , “Fourier series based learning control and application to position table”, Journal of Robotics and Autonomous Systems, 32(2000), pp. 89-100, July, 2000.
  • W. Zhou and L. Cai, “Edge location by use of optical phase variation”, Applied Optics, Vol. 39, No. 16, pp. 2569-2576, July 1, 2000.
  • H. Zhang , L. Cai and Z. Bien , “Multivariable adaptive fuzzy controller for nonlinear systems”, IEEE Transaction on Systems, Man, and Cybernetics, Part B: Cybernetics, Vol. 30, No. 1, pp 210-217, Feb. 2000.
  • X. Tang , L. Cai and W. Huang , “Decentralized tracking control of robot manipulators using Fourier series based learning control scheme”, IEEE Transaction on Robotics and Automation, Vol. 16, No. 1, pp. 36-45, Feb. 2000.
  • W. Zhou and L. Cai, “An optical readout for optical storage with phase jump”, Applied Optics, Vol. 38, No. 23, pp. 5058-5065, 10 August, 1999.
  • G. Song , L. Cai, and Y. Wang , “Robust friction compensation for precise and smooth position regulation, Journal of Systems and Control Engineering, Vol. 213, pp. 157-161, 1999.
  • W. Zhou and L. Cai, “Investigation on phase jump in a differential interferometer”, Journal of Applied Physics, Vol.85, No.9, pp. 6295-6302, 1 May 1999.
  • W. Zhou and L. Cai, “An improved angle interferometer based on total internal reflection”, Applied Optics, Vol. 38, No. 7, pp. 1179-1185, March, 1999.
  • W. Zhou and L. Cai, “A method for edge detection based on phase jump in a differential interferometer”, Applied Optics, Vol. 38, No. 1, pp. 152-159, 1999.
  • W. Zhou and L. Cai, “A phase jump phenomenon in interferometry,” Applied Physics Letter, Vol. 73, No 23, pp. 3339-3341, Dec. 1998.
  • G. Song , R.W. Longman and L. Cai, "Integrated adaptive/robust control of robot manipulators", Journal of Robotic Systems, Vol. 15, No. 12, pp. 699-712, December 1998.
  • W. Zhou and L. Cai, “An interferometer for small angle measurement based on total-internal-reflection”, Applied Optics, Vol. 37, No. 25, pp. 5957-5963, Sep. 1998.
  • W. Zhou and L. Cai, “An angular displacement interferometer based on total-internal-reflection”, Measurement Science and Technology, Vol. 9, No. 10, pp. 1647 -1652, July 1998.
  • G. Song and L. Cai, “Robust position/force control of robot manipulators during constrained tasks'', IEE Proceeding -Control Theory and Application, Vol. 145, No. 4, pp. 427-433, July, 1998.
  • G. Song , L. Cai, Y. Wang and R. Longman , “A sliding-mold based smooth adaptive robust controller for friction compensation”, International Journal of Robust and Nonlinear Control, Vol. 8, No. 8, pp. 725-739, July 15, 1998.
  • J. Zhang and L. Cai, “Interferometric straightness measurement system using triangular prisms”, Optical Engineering, Vol. 37, No.6 pp. 1785-1789, June, 1998.
  • J. Zhang and L. Cai, “Auto-focus laser encoder”, Applied Optics, Vol. 37, No. 13, pp. 2691-2695, May 1, 1998.
  • J. Zhang and L. Cai, “An auto-focusing measurement system with piezoelectric translator”, Journal of IEEE/ASME Transaction on Mechatronics, Vol. 2, No. 3, pp 213-217, Sept., 1997.
  • J. Zhang and L. Cai, “Profilometry using an optical stylus with interferometric readout”, Measurement Science and Technology, Vol. 8, No. 3, pp. 546-549, 1997.
  • G. Song and L. Cai, “A new approach to position/force control of flexible-joint robot manipulators”, Journal of Robotic Systems, Vol. 13, No. 7, pp. 429-444, July, 1996.
  • L. Cai and G. Song , “A new smooth robust nonlinear controller for robot manipulators with joint's stick-slip friction”, Journal of Robotic Systems, Vol. 11, No. 6, 1994, pp. 451-470.
  • L. Cai, “On the stability of the equilibrium states and small oscillations of nonholonomic systems”, Dynamics and Stability of Systems, Vol. 9, No. 1, 1994, pp. 3-17.


Tel +852 2358 7209
Email melcai@ust.hk
Office Room 2545