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"My Friend, RecurDyn"


Han-Sik Ryu, PhD, CTO

Han-Sik Ryu is the CTO of the FunctionBay, Inc. He is in charge of the FunctionBay R&D center, which is at the heart of the development of RecurDyn. He is a living witness to the history of FunctionBay. RecurDyn is very precious to him, like a good companion.
Han-Sik Ryu became a member of the original development team during the initial days of RecurDyn’s development before it was even a commercial product. His desire is that RecurDyn becomes much more than just a useful tool to the customers.
He hopes that it can give encouragement and inspiration to the engineers who use it.

 
 

Education

- (1997) Bachelor's degree in the mechanical engineering from
   Hanyang University
- (2004) PhD in the precision mechanical engineering from
   Hanyang University


Career

- (2007 ~ Now) CTO of FunctionBay, Inc.
- (2006) Senior research engineer of SAMSUNG THALES
- (1997~2005) Toolkit team manager at the R&D center in FunctionBay,
   Inc.


Award

- (2002) Awarded "Student Award"/1th Asian Conference on Multibody
   Dynamics(ACMD)
- (2006) Awarded "Paper Award"/1th Asian Conference on Multibody
   Dynamics(ACMD)
- (2004) Awarded "IR52 Jang Young Shil Award"/Korean Industrial
   Technology Association

   

Why did you join FunctionBay, Inc.?
When I was in graduate school, my laboratory was making the initial RecurDyn framework. My laboratory gave birth to RecurDyn. It was difficult in those days to imagine the current RecurDyn that has grown out of what we created because at that time, RecurDyn was not a commercial product.

For example, the solver had only three joint elements and three force elements. I had been a developer of RecurDyn before FunctionBay was founded, so it was natural for me to join the company when it was created.

Please introduce the areas of RecurDyn that you are responsible for.
Currently, I am in charge of the R&D center of FunctionBay, Inc. The R&D center is responsible for providing a high quality product to customers through its development direction, the development of new technologies, the product develop process, and quality assurance. Whenever I see engineers in the field happily using RecurDyn, I feel a duty to reward them with a more complete product.

What do you believe are the aspects of RecurDyn that differentiate it from other CAE software?
In the past, in general, CAE software supported the analysis of only a single field. Recently, CAE has expanded to provide a much more integrated multi-discipline solution. I think that the feature that differentiates RecurDyn is that it provides a powerful, integrated multi-discipline solution based on a single platform (One platform, one solver). Specifically, RecurDyn includes a mesher to convert a rigid body into a flexible one, it includes both modal and nodal formulations for modeling flexible bodies, and it can perform fatigue analysis, all in a single platform. Furthermore, RecurDyn includes its own controls module called CoLink, as well as built-in the design optimization. RecurDyn will support particle dynamics soon, which will support very large numbers of particles. This will allow RecurDyn to model both solid and fluid interaction with rigid and flexible bodies.

The strength of RecurDyn is MFBD. What do you believe are the strong points of MFBD?
MFBD (Multi-Flexible-Body Dynamics) is the integration of rigid body dynamics and flexible body dynamics in the same model. This makes it possible to analyze a system in which the deformation of the bodies influence the system. The flexible bodies can undergo very large motion without requiring the use of linearization.

Usually, this requires two separate analysis programs to be used together, but in RecurDyn, they are integrated into one solver. This allows RecurDyn to provide very high accuracy, while at the same time, reducing the modeling and analysis time. MFBD in RecurDyn also combines contact analysis, controls, and design optimization into the same platform, which considerably increases the range of problems that it is capable of analyzing.

What do you believe is the outlook of RecurDyn in the future of the CAE market
I think that the market for multibody dynamics will grow. The market is expanding from the analysis of single, isolated aspects of a system to the analysis of integrated, multi-discipline systems. I strongly believe that RecurDyn will grow significantly in that market because of its many strong points, such as its intuitive and simple UI, its integrated, multi-discipline solver, and its high performance.

What would you like to achieve in the future development of RecurDyn?
My hope is that RecurDyn becomes like a good friend to the engineers who use it. A good friend can give us encouragement and courage when we want to give up. A friend can give us creative inspiration when we need direction. It would make me happy to know that RecurDyn has helped engineers make the world a better place. My goal is to develop RecurDyn into a product that can achieve this hope.


Papers & Journals

Domestic Proceedings

 - (2001) "Experimental Validation of Dynamic Track Tension for High Mobility Tracked Vehicle", The
    Korea Society of Automotive Engineers, 2001 Spring Conference
 - (2002) "Track system interactions between the track link and the ground", The Korea Society of
    Automotive Engineers, 2002 Autumn Conference
 - (2003) "Efficient Contact and Nonlinear Dynamic Modeling of Automotive Silent Chain Drive", The
    Korea Society of Automotive Engineers, 2003 Spring Conference
 - (2004) "Dynamic Analysis of Spur Gear Pairs: Mesh forces with Efficient Contact Analysis", The Korea
    Society of Automotive Engineers, 2004 Spring Conference
 - (2005) "Contact Modeling Method of a Ball Bearing for Motorcycle Engine System", The Korean
    Society of Mechanical Engineers, 2005 Spring Conference
 - (2005) "Contact Modeling Method of a Roller Bearing", The Korea Society of Automotive Engineers,
    2005 Autumn Conference
 - (2009) "Modeling and Numerical Analysis of Paper separation and feeding conditions", The Korean
    society of Mechanical Engineers, 2009 Spring Conference
 - (2010) "Three dimensional dynamical analysis of paper in printer considering air-resistance effect”,
    The Korean Society of Mechanical Engineers, 2010 Spring Conference


International Proceedings

 - (1999) "A COMPLIANT DOUBLE PIN TRACK LINK MODEL FOR MULTIBODY TRACKED VEHICLES",
    Proceedings of DETC’99, 1999 ASME Design Engineering Technical Conferences, September 12-15,
    1999, Las Vegas, Nevada, USA, DETC99/VIB-8199
 - (2001) "DYNAMIC TRACK TENSION OF HIGH MOBILITY TRACKED VEHICLES", Proceedings of DETC’
    01, 2001 ASME Third Symposium on Multibody Dynamics and Vibration, September 9-12, 2001,
    Pittsburgh, PA, USA, DETC2001/VIB-21309
 - (2001) "A RECURSIVE IMPLEMENTATION METHOD with IMPLICIT INTEGRATOR FOR MULTIBODY
    DYNAMICS", Proceedings of DETC’01, 2001 ASME Third Symposium on Multibody Dynamics and
    Vibration, September 9-12, 2001, Pittsburgh, PA, USA, DETC2001/VIB-21319
 - (2002) "Development of A Multibody Dynamics Simulation Tool for Tracked Vehicles, Part I : Efficient
    Contact and Nonlinear Dynamic Modeling", Proceedings of ACMD’02, The First Asian Conference on
    Multibody Dynamics 2002, July 31-August 2, 2002, Iwaki, Fukushima, Japan
 - (2002) "An Efficient Contact Search Algorithm using the Relative Coordinate System for Multibody
    System Dynamics", Proceedings of ACMD’02, The First Asian Conference on Multibody Dynamics
    2002, July 31-August 2, 2002, Iwaki, Fukushima, Japan
 - (2002) "A Recursive Implementation Method with Implicit Integrator for Multibody Dynamics",
    Proceedings of ACMD’02, The First Asian Conference on Multibody Dynamics 2002, July 31-August 2,
    2002, Iwaki, Fukushima, Japan
 - (2003) "Efficient Contact and Nonlinear Dynamic Modeling of Automotive Silent Chain Drive",
    MULTIBODY DYNAMICS 2003, IDMEC/IST, Lisbon, Portugal, July 1-4, 2003
  - (2004) "Dynamic Analysis of Spur Gear Pairs : Mesh Forces with Efficient Contact
    Analysis",Proceedings of ACMD’04, The 2nd Asian Conference on Multibody Dynamics 2004, August
    2-August 4, 2004, Seoul, Korea
 - (2005) "Contact And Nonlinear Dynamic Modeling of A BALL BEARING FOR MOTORCYCLE
    ENGINE SYSTEM", Proceedings of IDETC’05, 2005 ASME 5th International Conference on Multibody
    Systems, Nonlinear Dynamics, and Control, September 24-28, 2005, Long Beach, California, USA
 - (2006) "Dynamic Modeling and Experiment of Military Tracked Vehicle", 2006 SAE World Congress,
    April 3-6, Detroit, USA
 - (2008) "AN EFFICIENT PENETRATION DEPTH CALCULATION ALGORITHM AND AN ENHANCED
    NUMERICAL CONTACT FORCE MODEL", Proceedings of ACMD’08, The 4th Asian Conference on
    Multibody Dynamics 2008, Tokyo, Japan
 - (2010) "A STUDY ON THE STICK AND SLIP ALGORITHM IN CONTACT PROBLEMS OF MULTIBODY
    SYSTEM DYNAMICS", the 5th Asian Conference on Multibody Dynamics 2010, August 23-26, 2010,
    Kyoto, Japan
 - (2012) "The Efficient Dynamic Modeling of a Manipulator Robot System", the 6th Asian Conference on
    Multibody Dynamics, August 26-30, 2012, Shanghai, China


Domestic Journals

 - (2003) "Characteristics of Dynamic Track Tension for Three Dimensional High Mobility Tracked
    Vehicle", The Korea Society of Automotive Engineers, the collection of dissertations 2003, Vol.11,
    No.1, pp.112~120
 - (2003) "Dynamic Characteristics for Three Dimensional High Mobility Tracked Vehicles", Mechanical
    engineering technology laboratory of Hanyang university the collection of dissertations 2003, Vol.9,
    No.1, pp.73~83
 - (2004) "Track System Interactions Between the Track Link and the Ground", The Korea Society of
    Mechanical Engineers, the collection of dissertations A, Vol.28, No.11,
    pp.1711~1718
 - (2007) "Validation of Contact Modeling Method for Dynamic Analysis of Roller Bearing", The Korea
    Society of Automotive Engineers, Vol.15, No.4 (July,2007),
    pp.115~123


International Journals

 - (2000) "A Compliant Track Model For High Speed, High Mobility Tracked Vehicle", International
    Journal For Numerical Methods in Engineering, Vol.48,pp.1481-1502
 - (2003) "Development of A Multibody Dynamics Simulation Tool for Tracked Vehicles, Part I : Efficient
    Contact and Nonlinear Dynamic Modeling", JSME International Journal, Vol.46,No.2, pp.540-549
 - (2005) "Dynamic Analysis of Contacting Spur Gear Pair for Fast System Simulation", International
    Journal of Solid and Phenomenon
 - (2010) "An efficient and robust contact algorithm for a compliant contact force model between bodies
    of complex geometry" in the following paginated issue of Multibody System Dynamics: Volume 23
    ,Issue 1, p.99
 - (2011) "Stick-slip algorithm in a tangential contact force model for multi-body system dynamics"
    Journal of Mechanical Science and Technology, Volume 25, Issue 7, p.1687-1694


Ph.D. Dissertation

 - (2004) "Investigation of the Dynamic Tension and Behavior for Three Dimensional High Mobility
    Tracked Vehicles", Hanyang University

   
   
Interview List

Juhwan Choi, Ph.D,
Team manager
(Solver 2)

Graham Sanborn, Ph.D, Principal research engineer (Solver 2)

Jeonghan Lee, Ph.D., Duty general manager (Solution Group)

Sun Kim, Ph.D.,
Team manager
(GUI 1)


Joon-Shik Yoon, Ph.D,
Team manager
(Solver 1)


Han-Sik Ryu, PhD, CTO