1
The Institute of Precision Engineering- An Introduction
http://www.ipe.cuhk.edu.hk/
Ruxu Du, Ph.D.Professor and Director
Institute of Precision EngineeringThe Chinese University of Hong Kong
January 2007
2
http://www.ipe.cuhk.edu.hk/
CUHK• The Chinese University of Hong Kong is
celebrating her 43th anniversary now
3
http://www.ipe.cuhk.edu.hk/
CUHK• The numbers
– 9,000 undergraduate and 5,000 graduates– 8 faculties, 62 departments, 820 professors– HK$4.2 billion (US$600 million) annual budget– HK$1.0 billion (US$125 million) annual research
grants
4
http://www.ipe.cuhk.edu.hk/
DU• The academic career of Prof. R. Du
– 1989, Ph.D., the University of Michigan– 1991, Assistant Professor, the University of Windsor
(Windsor, Ontario, Canada)– 1995, Associate Professor, the University of Windsor– 1999, Associate Professor, the University of Miami
(Coral Gables, Florida, USA)– 2001, Professor, the Chinese University of Hong Kong– 2006, Founding director, Institute of Precision
Engineering, CUHK– More updated information can be found at our website
at www.acae.cuhk.edu.hk/~rdu
5
http://www.ipe.cuhk.edu.hk/
DU• Research funding:
– Up to date: HK$92,000,000 (US$11,500,000)– Annual budget in 2005-06: HK$24,000,000
(US$3,000,000)
• Current team members:– 4 Professors– 8 Post Doctor Fellows / Visiting Scholars– 5 Research Associates / Assistants– 6 Ph.D students– 6 M.Phil. students– 10 in our Shenzhen Operation 1– 16 in our Shenzhen Operation 2
6
http://www.ipe.cuhk.edu.hk/
DU• Publications:
– International journal publications: 70– International conference publications: 82– Book chapters: 7– Patents: 5
• Services – Associate Editor, Int. J. of Control and Intelligent
Systems– Associate Editor, Computer Aided Design and
Applications– Member of Editorial Board, Int. J. of Power and Energy
Systems– Chair, 2nd Asian International Conference on
Mechantronics (2006)
7
http://www.ipe.cuhk.edu.hk/
The team
200220032004200520062007
8
http://www.ipe.cuhk.edu.hk/
Research Directions• Condition monitoring, fault diagnosis and
automatic control• Design
– Metal forming press design– Air conditioning system design– Industrial sewing machine design– Footwear design
• Manufacturing– Metal forming– Metal cutting– Plastic injection molding
9
http://www.ipe.cuhk.edu.hk/
Technology Inventions• Condition monitoring and fault diagnosis
– New methods• 4D holospectrum (1994)• Snake Skeleton Graph (2002)• Fuzzy Transition Probability (2004)• Bio-inspired method (2006)
– Applications• Machining (1985 ~ 1995)• Large rotating machinery (1994)• Metal forming (1999 ~ 2005)• Plastic injection molding (2003)• Air conditioning systems (2005)
10
http://www.ipe.cuhk.edu.hk/
Technology Inventions• Industry sewing machine and sewing process
Modeling and simulation
Needle heatingNeedle cutting
11
http://www.ipe.cuhk.edu.hk/
Technology Inventions• Sheet metal stamping process monitoring and
diagnosis
Inverse FEM software
On-line monitoring based on SVM
Current project: design optimization
Diagnosis based on thermo energy distribution
12
http://www.ipe.cuhk.edu.hk/
Technology Inventions• Design a new controllable mechanical metal
forming press
First Prototype Second Prototype
Current projects: build a 300 ton prototype
13
http://www.ipe.cuhk.edu.hk/
Technology Inventions• Design a solar air conditioner
Refrigerant storage for instant response
On-spot cooling
Bubble pump powered by solar vacant tube
14
http://www.ipe.cuhk.edu.hk/
Technology Inventions• Other projects
– Virtual label: an expert system for textile label pattern editing and simulation
– Shoe design: design custom-made athletic and causal footwear
– Condition monitoring and control of plastic injection molding process
– Tool condition monitoring in machining– ……
15
http://www.ipe.cuhk.edu.hk/
New Projects• Do you know what mechanism is this?
16
http://www.ipe.cuhk.edu.hk/
New Projects• The watch project
– The sponsors:• Innovation and Technology Commission, Hong Kong• Hong Kong Watch Manufacturers Association• Federation of Hong Kong Watch Trade and Industry• Federation of Hong Kong Industry, Watch and Clock Council
– The budget: HK$64 million (US$8 million)– The objective: Develop technologies and capabilities
for design and manufacture high quality mechanical watch movements
– The time: started on Jan. 1, 2006 for three years
17
http://www.ipe.cuhk.edu.hk/
New Projects• The watch project
– Selected R&D projects:• Dynamic modeling and design optimization • Virtual library• Signature analysis• Micro CNC gear hobbing machine• Ultra precision wire EDM machine• Nanospring• Micro assembly• Precision stamping• Six sigma quality management• …….
18
http://www.ipe.cuhk.edu.hk/
New Projects– Dynamic modeling of the Swiss lever mechanism
– The kinematics does not satisfy the Lipschitz condition and hence, can only model by a set of 11 impulsive differential equations
– Solving the equation set reveals the dynamical behavior of the mechanism
-150 -100 -50 0 50 100 150-2500
-2000
-1500
-1000
-500
0
500
1000
1500
2000
2500
Displacement (degree)
Vel
ocity
(de
gree
/s)
Balance Wheel Displacement versus Velocity
-15 -10 -5 0 5 10 15-800
-600
-400
-200
0
200
400
600
800
Displacement (degree)
Vel
ocity
(de
gree
/s)
Escape Wheel Displacement versus Velocity
Phase diagram of the balance wheel
Phase diagram of the pallet fork
19
http://www.ipe.cuhk.edu.hk/
New Projects– Virtual library
Daniel Co-axial
English lever
Swiss lever
20
http://www.ipe.cuhk.edu.hk/
New Projects– Signature analysis
• Use FEM to find the modal frequencies
• Use reassigned spectrogram to diagnose possible errors
21
http://www.ipe.cuhk.edu.hk/
New Projects• Micro CNC gear hobbing machine
CAD model of the machine
Computer simulation of gear formation
22
http://www.ipe.cuhk.edu.hk/
New Projects– Ultra precision wire EDM machine
• Minimum wire size: 0.03 mm• Minimum resolution: 0.1 m• 3D EDM milling
23
http://www.ipe.cuhk.edu.hk/
Thank you
