Mechanical Engineering
Resume:
Wei Keat Chai Mobile Phone:
Los Angeles, CA 90034
E-mail: ******@*****.***/********@*****.***
____________________________________________________________________________
__
STAFF ENGINEER, Samsung (SISA), San Jose Research Center (12/2009-current)
Storage Division - HDD Platform Integration
-Drive system level operational shock simulation and enhancement
-Drive reading head suspension simulation and design
-System test evaluation and subsystem development
-Drive system reliability testing and development
-Hard disk drive mechanical platform simulation and design support
-Plastic compression analysis for enclosure sealant
DESIGN & ANALYSIS ENGINEER, Magnecomp Corp, Temecula Devlp. Ctr USA.
(3/2006-12/2009)
Advanced Product Development (Dual Stage Actuator-DSA)
- High performance suspension development with actuator implemented on
mechanical suspension components to meet market demand
-Implementation of smart material (PZT) as actuator in HDD suspension
product as position fine tuner of HDD reading head
-Geometrical effects and design optimization of PZT as micro-actuator.
Actuator design placement for suspension optimum performance
-Smart material (PZT) program code development in FEM environment
(Ansys11.0 /Workbench). Specific Piezoelectric actuation performance code
template development to incorporate with dynamic analysis in classic Ansys
and Ansys workbench
-Thermal analysis for geometrical deformation and product reliability
-Interconnect design for electro-mechanical subsystem
-Able to start with conceptual design and complete the whole prototype
cycle - design, simulation modeling, product drawing with DFM (supplier and
customer), prototyping and testing
-Plan, coordinate and execute of development project with various
engineering teams (production, process and test)
New Product Development (HDD suspension, flexure circuit)
-Modifying existing products designs and develops new product designs in
order to improve marketing opportunities and increase sales
-Plan, coordinate and execute design activities in accordance with
manufacturing capabilities and schedule objectives
-Determine design approaches and parameters or analyzes and conduct
feasibility studies on new design
- Develop and design disk suspension and circuit to accommodate higher
capacity. Coordinate with suppliers and customer to finalize design from
artwork sketch to prototype and mass production
-Develop & administer product test protocols and interpret test results.
Dynamics and reliability test, correlation of testing and simulation data
-Assist in development of design standards and manufacturing procedures,
and test for quality assurance issues, to maintain extremely close
tolerances for sub-micron suspension assemblies
-Prepare technical data and analysis reports
-GD&T and tolerance analysis
- Bills-of-material preparation (BOM)
-Work on six production programs. Mainly 3.5" suspension on 1-2/3 disks,
80/160/250/330/500 capacity per disk
FEM Analysis Capability (Ansys9/11.0)
-High level computational modeling including static, harmonic, time domain,
shock analysis, micro-actuator PZT stroke sensitivity, large strain metal
plasticity, plastic nonlinear analysis for better model and to assess the
design performance of products and processes.
-Perform calculations and in-depth engineering analysis such as: DOE
(design on experiement), mechanical loading, components stiffness, stress,
harmonic, transient and vibration analysis that supports and justifies
product designs.
-Utilize computational multi-field dynamics/multi physics to solve problems
involving coupled electrical-thermo-structural analysis.
-Use APDL programming and work with associatively linked solid modeling and
finite element analysis.
NX 6.0/Solidworks/Pro-E and AutoCad
-Create solid models and detailed assembly, cross-section and component
drawings
-Create detailed assembly and component drawing for manufacturing and DFM
(design for manufacturing) activity.
-3-D modeling for FEM simulation
MECHANICAL ENGINEER, PCS Inc. Fremont CA (7/2005 - 3/2006)
Equipment and Tool Design/Development
-Machine design for Level 3 tab/COG bonding and remove purposes.
-Driver hand shaft alignment tester
-Stuck tape roller devise
-Tape drives stacker. Multi drive compartment.
-LCM/LCD multi-holder
-Power bay for Tape driver.
Clean Room Environment Class 100
-Failure analysis (FA) on failed LCD panels
-New product introduction (NPI)
-Level 3 LCD panel repair
-Tab/COG testing, removing, cleaning, bonding
Process Layout for Production Environment
-Testing and screening process for both Tape drive and TV production lines:
e.g. SunMirco System and Nexgen/Westinghouse/CMO TV repair units
-Level 1 repair process
-BOM preparation
____________________________________________________________________________
________
ACADEMIC EXPERIENCE
RESEARCH ASSISTANT, University of Kentucky (08/1999 ~ 05/2004)
Dynamic Modeling of Smart/Adaptive Structures
-Controllable electrostrictive shell
-Hybrid electrostrictive/piezoelectric shell
-Magnetoelastic coupling of Magnetostrictive shell
-Extensive studied of distributed smart structures based on Gibbs free
energy function, double-curvature shell theory, elastic theory and
Hamilton's principal
-The smart material shell is modeled in multi-simulation environment
(Fortran, MatLab, Simulink, Maple) with classical solid mechanic theory
- SMART/Active materials being studied are usually light in weight to embed
in structure for sensor-actuator purposes instead of conventional actuator
control system
- Final studied with technical publication is proposes for implementation
in airplane's wing, tail wing, cockpit, exhaust dilatation of jet engine
and surface control of satellite dish.
-All studied is state of the art technology partially sponsored by US AIR
FORCE and NASA
Vibration and Control in Smart Material Embedded Shell Structure
-In-depth knowledge of structures' dynamic behaviors, i.e. natural
frequencies, mode shapes, force vibration characteristics and system
damping
-Active and passive vibration control
-Vibration analysis on composite, embedded/laminated, linear elastic
structures with different environmental influences
Experimental and Analytical Verification
-Design and testing of hybrid polymeric beam with bang-bang control
algorithm
-Distributed vibration control of hybrid conical shells
-Nonlinear axial and transverse control of beams with large deformation and
thermal effects
-Comparison of electrostrictive/piezoelectric/low permitivitties dielectric
materials control efficiency
-Performance comparison between electrostrictive and piezoelectric shells
- Micro-actuation characteristics and location sensitivity of piezoelectric
laminated conical and toroidal shells
-The control efficiency of electrostrictive and piezoelectric materials is
studied to compare the superiority.
Health Monitoring for Structural Components
-Polymeric sensor (PVDF) as structure laminated sensor
-Modal voltages of beams, experimentally and theoretically
-Linear/nonlinear deep and shallow conical shell modal potential
-Smart sensor can be designed and "shaped" according to different
environment and monitoring purposes.
Materials studied and testing
-Unimorph actuation design and testing with elastomeric materials such as
polyurethane elastomer (PUE), silicone, urethane, fluorosilicone, isoprene,
polybutadiene, polyurethane Deerfield PT6100S, silicone Dow Corning Sylgard
186, silicone Dow Corning RTV730, polyurethane 2103-80AE, metallic SMA
wires
Smart Material and Devices Design
-SUV/Truck Roll Over Live Saver, sponsored by Ford Motor Corp. -
Reinforcement of car-frame's strength for passenger protection.
-Satellite Deployment Design and Surface Control System, sponsored by Jet
Propulsion Laboratory, Caltech - Design of mechanical joint adjustment
operation in space and dish's shape formation.
-Mechanical Multi-Purpose Cramp for different airplane wing's simulation.
-Drug Delivery System - Designed a micro-pump that produces smooth,
continuous and quiet flow for the use of body implant & in emergency.
-Basketball rim design, vibration absorber
TEACHING EXPERIENCE, University of Kentucky
-Dynamics of Distributed Mechanical System
-Control System Engineering
-Modeling and Analysis of Dynamic Systems
DISSERTATION
Thesis: Micro-electromechanics and Distributed Control of Hybrid
Electrostrictive/Piezoelectric Shell Structronic System, Ph.D.
Dissertation, Department of Mechanical Engineering, The University of
Kentucky, Advisor: Prof. H.S. Tzou
EDUCATION
University of Kentucky, Lexington, Kentucky
B.S. in Mechanical Engineering
Ph. D in Mechanical Engineering
COMPUTER LITERACY
Ansys 9-11, Ansys Workbench, Solid Works 2005-2007, ProE WildFire, AutoCAD
2000/2006/2007, VISIO 2000, FORTRAN, Matlab 6, Maple 7, MathCAD, Simulink,
Microsoft Office.
____________________________________________________________________________
________
ACCOMPLISHMENT
-Lead the company to capable with all type of HDD DSA suspension design
customization to meet customer need
-Two DSA suspension prototype completion
-12 Jornal articles and 14 conference proceeding published
-Five patents in application
-Six sigma orange belt
PUBLICATIONS
Journal Articles
(1) Chai, W.K., Tzou, H.S., Arnold, S.M. and Lee, H.-J.,
2008,"Magnetostrictive Microactuations and Modal Sensitivities of Thin
Magnetostrictive Shells," Journal of Pressure and Vessel Tecnology, Feb
2008, Vol 130, Issue 1, 011206.
(2)Chai, W. K., Han, Y., Higuchi, K., and Tzou, H. S., 2006, "Micro-
actuation Characteristics of Rocket Conical Shell Sections," Journal of
Sound and Vibration, May 2006, Vol. 293, Issue 1-2, pp. 1397-1411.
(3)Chai, W. K., DeHaven, J. G., Hanson M. and Tzou, H. S., 2005, "Neural
Signals of Nonlinear Conical Nozzles," Technische Mechanik, Band 25, Heft
1, pp27-38, manuskripteingang: 27. Mai 2004.
(4)Chai, W. K., DeHaven, J. G. and Tzou, H. S., 2005, "Spatial Microscopic
Actuations of Shallow Conical Shell Sections," Journal of Vibration and
Control, Vol. 11, pp. 1397-1411.
(5)Chai, W.K., Smithmaitrie, P. and Tzou, H.S., 2004, "Neural Potentials
and Micro-signals of Non-linear deep and Shallow Conical Shells,"
Mechanical Systems and Signal Processing, Vol. 18, Issue 4, July 2004,
pp.959-975.
(6)Tzou, H.S., and Chai, W.K., 2007, "Design and Testing of Hybrid
Polymeric Electrostrictive/Piezoelectric Beam with Bang-Bang Control,"
Mechanical Systems and Signal Processing, Volume 21, Issue 1, January 2007
pp.417-429.
(7)Tzou, H.S., Chai, W.K. and Hanson, M., 2006, "Dynamic Actuation and
Quadratic Magnetoelastic Coupling of Thin Magnetostrictive Shells," Journal
of Vibration and Acoustics, Volume 128, Issue 3, pp.385-391.
(8)Tzou, H.S., Chai, W.K., and Arnold, S.M., 2006, "Structronics and
Actuation of Hybrid Electrostrictive/Piezoelectric Thin Shells," ASME,
Journal of Vibration & Acoustics, Feb 2006, Volume 128, Issue 1, pp.79-87.
(9)Tzou, H.S., Chai, W.K. and Wang, D.W., 2004, "Micro-Control Actions and
Location Sensitivity of Actuator Patches Laminated on Toroidal Shells,"
ASME, Journal of Vibration & Acoustics, Vol.126, Issue 2, pp.284-297.
(10) Tzou, H.S., Chai, W.K. and Wang, D.W., 2003, "Modal Voltages and
Distributed Signal Analysis of Conical Shells of Revolution," Journal of
Sound and Vibration, Vol. 260, No. 4, pp. 589-609.
(11)Tzou, H.S., Wang, D.W. and Chai, W.K., 2002, "Dynamics and Distributed
Control of Conical Shell Laminated with Full and Diagonal Actuators,"
Journal of Sound and Vibration, Vol. 256, No.1, pp.65-79.
(12)Howard, R., Chai, W.K., and Tzou, H.S., 2001, "Modal Voltages of linear
and non linear Structures Using Distributed Artificial Neurons," Mechanical
Systems and Signal Processing, Vol. 15, No. 3, May 200, pp. 629-640.
Conference Proceedings
(1)Chai, W.K., DeHaven, G.J., and Tzou, H.S., 2004, "Distributed Micro-
Control Characteristics of Shallow Conical Shell Sections," The 7th
International Conference on Motion and Vibration Control (MOVIC'2004), St.
Louis MO, USA August 8-11, 2004.
(2)Chai, W.K., DeHaven, G.J., and Tzou, H.S., 2004, "Neural Signals of
Conical Nozzles with Geometric Nonlinearity," The 7th International
Conference on Motion and Vibration Control (MOVIC'2004), St. Louis MO, USA
August 8-11, 2004.
(3)Chai, W.K., Tzou, H.S. and Arnold, S.M., 2003, "Micro-Structronics and
Control of Hybrid Electrostrictive/Piezoelectric Thin Shells," Paper No.
IMECE2003-42389, 2003 ASME International Mechanical Engineering Congress
and Exposition (IMECE'2003), Washington, D.C. - November 16 - 21, 2003.
(4)Chai, W.K., Tzou, H.S. and Higuchi, V., 2003, "Micro-Control
Characteristics Induced by Actuator Patches Laminated on a Conical Shell
Section," Paper No. IMECE2003-42387, 2003 ASME International Mechanical
Engineering Congress and Exposition (IMECE'2003), Washington, D.C. -
November 16 - 21, 2003.
(5)Chai, W.K., Smithmaitrie, P., Tzou, H.S. 2002, "Distributed Microscopic
Signals and Modal Potentials of Nonlinear Conical Shells," 7th Biannual
Symposium on Active Control of Vibration and Noise - ASME IMECE 2002, New
Orleans, LA, Nov.17-22, 2002.
(6)Tzou, H.S., and Chai, W.K., 2005, "Nonlinear Control of Hybrid
Electrostrictive/Piezoelectric Polymeric Structures: Theory and
experiment," ASME International Design Engineering Technical Conference &
Computers and Information in Engineering Conference September 24-28, 2005,
DETC2005-85596.
(7)Tzou, H.S., Chai, W.K., and Arnold, S.M., 2004, "Dynamic Magnetoelastic
Coupling and Control of Thin Magnetostrictive Structronic Shells," 2004
ASME International Mechanical Engineering Congress and Exposition
(IMECE'2004), Anaheim, CA - November 14-19, 2004 IMECE2004-61333.
(8)Chai, W.K., DeHaven, G.J., Tzou, H.S., and Arnold, S.M., 2004,
"Magnetostrictive Actuation of Cylindrical Magneto-Structronic Shells,"
2004 ASME International Mechanical Engineering Congress and Exposition
(IMECE'2004), Anaheim, CA - November 14-19, 2004, IMECE2004-61335
(9)Tzou, H.S., and Chai, W.K., and Wang, D.W., 2002, "Micro-Control Actions
and Location Sensitivity of Actuator Patches Laminated on Toroidal Shells,"
7th Biannual Symposium on Active Control of Vibration and Noise - ASME
IMECE 2002, New Orleans, LA, Nov.17-22, 2002.
(10)Tzou, H.S., and Chai, W.K., 2002, "Constitutive Modeling of
Controllable Electrostrictive Thin Shell Structure," Paper No. IMECE2002-
32328 7th Biannual Symposium on Active Control of Vibration and Noise -
ASME IMECE 2002, New Orleans, LA, Nov.17-22, 2002.
(11)Tzou, H.S., Chai, W.K. and Wang, D.W., 2001, "Modal Voltages and
Distributed Signal Analysis of Conical Shells of Revolution," Proceeding of
ASME International Design Engineering Technical Conferences, Paper No.
VIB21544.
(12)Tzou, H.S., Wang, D.W. and Chai, W.K., 2001, "Dynamics and Distributed
Control of Conical Shell Laminated with Full and Diagonal Actuators,"
Proceeding of ASME International Design Engineering Technical Conferences,
Paper No. CIE21272.
(13)Tzou, H.S., Ding, J.H., and Chai, W.K., 2000, "Nonlinear Axial and
Transverse Oscillation and Control of a PZT Laminated Distributed
Structronic System," 6th Biennial Symposium on Active Control of Vibration
and Noise - New Millennium, ASME IMECE 2000, Orlando, FL, Nov.5-10, 2000,
AD-Vol.61, pp.125-132.
(14)Howard, R., Chai, W.K., and Tzou, H.S., 1999, "Modal Voltages of linear
and non linear Structures Using Distributed Artificial Neurons," ASME WAM,
Adaptive Structures and Materials System, AD-59/MD-87, pp.219-226.
Technical Presentation
(1)Chai, W.K., and Tzou, H.S. 2004, "Performance Comparison Between
Electrostrictive and Piezoelectric Micro-Actuations of Shells," 2004 ASME
International Mechanical Engineering Congress and Exposition (IMECE'2004),
Anaheim, CA - November 14-19, 2004.
Contact this candidate