Sridhar Kota

Professor, Department of Mechanical Engineering

Also visit Compliant System Design Lab homepage (http://www.engin.umich.edu/labs/csdl) !

Research Interests  

Mechanical Design of machinery and electromechanical systems. Kinematic and dynamic synthesis of mechanisms. Compliant Mechanisms: Design methods  and applications to MEMS, Adaptive Structures and Product Design for  No-Assembly. Reconfigurable Machine Tools and Design of Reconfigurable Products.

Teaching 

Courses in Mechanisms Design, Machine Design, Senior Capstone Design Projects, and Design for Manufacture.

Selected Publications

Kota S., Erdman A.G. Motion Control in Product Design,” ASME Mechanical Engineering, Vol. 119, No.8, pp. 74-77, August 1997.

Ananthasuresh G.K, S. Kota, “Designing Compliant Mechanisms,” ASME Mechanical Engineering, November 1995.

S. Kota, J. Hetrick, Z. Li, L. Saggere, “Tailoring Unconventional Actuators with  Compliant Transmissions: Design Methods and Applications,” IEEE/ASME Transactions on Mechatronics, Vol. 4, No. 4 December 1999 pp396-408.

Saggere, L., Kota  S., “Static Shape Control of Smart Structures Using Compliant Mechanisms,”  AIAA Journal, Volume 37, Number 5, pp.572-578,  May 1999.

Kota S., Hetrick J., Li Z., Rodgers S., Krygowski T., "Synthesizing High-Performance Compliant Stroke Amplification Systems for MEMS, Proc. of the Thirteenth Annual International Confernece on Micro Electro Mechanical Systems, Miyazaki, Japan, Jan. 2000.

Kota S., Chiou S-J, “Automated Conceptual Design of Mechanisms,” International Journal of Mechanisms and Machine Theory, No. 34 (1999) pp. 467-495, Pergamon Press.

Text Book

Arthur Erdman, George Sandor, Sridhar Kota, Mechanisms Design - Analysis and Synthesis, Fourth Edition, Prentice Hall, Jan 2001.

 

  1. Compliant Mechanisms

  2. Reconfigurable Machine Tools

  3. Mechanisms Design

 

Compliant Mechanisms

Joint-less mechanism where elastic deformation is intended as source of motion

Design Synthesis Methods

Topological synthesis

The goal of topology synthesis is to identify the optimum number and connectivity of structural elements to achieve specified motion requirements. Topology synthesis is a critical stage of the design process, due to the fact that the main performance of a compliant system is determined by its structure configuration.

 

Dimensional synthesis: Size & shape optimization

Topology optimization provides qualitative results in that it provides a kinematically functional mechanism. it can not provide a mechanism with prescribed performance characteristics such as geometric advantage and mechanical advantage.  The goal of dimensional synthesis for compliant mechanisms is to generate a detailed description of the structure's size and geometry for a given topology. Dimensional synthesis finalizes the design so that the compliant mechanism satisfies the given specifications and with optimum performance such as energy efficiency.

 

Applications

Micro Electro Mechanical System (MEMS)

Macro domain

Aerospace (Adaptive/smart structures)

Automotive, Manufacturing, Medical, etc.

Precision instrumentation

 

Reconfigurable Machine Tools

A new generation of machine tool that can be easily reconfigured to quickly accommodate changing demands in product design (machining requirements). This arch-type machine is designed to provide maximum flexibility and work-envelope with minimum number of active axis

 

Mechanisms Design

 

 

ME450 - Design and Manufacturing III

A mechanical engineering design project by which the student is exposed to the design process from concept through analysis to layout and report. Projects are proposed from the different areas of study within mechanical engineering and reflect the expertise of instructing faculty. Two hours of lecture and two laboratories.

 

ME452 - Design for  Manufacturability

Conceptual design. Design for economical production, Taguchi methods, design for assembly; case studies. Product design using advanced polymeric materials and composites; part consolidation, snap-fit assemblies; novel applications. Design projects.

 

ME551 - Mechanisms Design

The course provides a comprehensive treatment of fundamental principles of kinematics of mechanized motions using linkages, cam-follower systems & gear trains. Students will also learn state-of art synthesis software tools. A semester-long design project provides an opportunity to design and build novel mechanisms.

Modules

 

Compliant Mechanisms

Design for No-Assembly (DNA): Stapler, windshield wiper, side-view mirror-adjustment system,  compliant easy-to disassemble snap fit
MEMS applications: Stroke-amplifier (Patents pending), double V-beam suspension for linear micro actuators
Smart structure applications: Adaptive compliant wing (Patents pending)

 

Reconfigurable Machine Tools

Reconfigurable machine tool

A 3-degree of freedom Parallel Work-Support Module

Reconfigurable automatic tool-changer (Patents pending)

Machine spindle with reconfigurable-power (Patents pending)

 

Plural Output Differential Mechanisms

Universal robotic gripper

Differential nut-runner

A novel stirling engine mechanism

Adjustable robotic mechanism

Cam design software

 

Other mechanisms

 

Current graduate students

Mr. Honjoon Chung
Mr. Charles Kim
Ms. Kerr-jia Lu
Mr. Tanakorn Tantanawat
Mr. Brian Trease
Ms. Christine Vehar

 

Recent graduate students

Dr. Sangku Moon

Dr. JinYong Joo

Dr. Yong-mo Moon

Dr. Joel Hetrick

Dr. Ronald Kalnas

Dr. Laxman Saggere

Dr. Mary Frecker

Dr. G. K. Anathasuresh

Dr. Shean-Juinn Chiou

Dr. Thatchai Chuenchom

Dr. Irfan Ullah

 

Faculty collaborators

Professor Noboru Kikuchi
Dr. Zhe Li
Dr. Selden Crary
Professor T. Wass

 

Compliant Mechanism Research Groups

The University of Michigan

The University of Pennsylvania

Pennsylvania State University

The University of Wisconsin

Brigham Young University

Technical University of Denmark

 

Research Sponsors

Air force office of scientific research

The National science Foundation

 

External Collaborator's

Sandia National Laboratories

 

E-mail: kota@engin.umich.edu

U.S. Mailing Address:

2250 GG Brown Lab
Department of Mechanical Engineering
University of Michigan
2350 Hayward St
Ann Arbor MI  48109-2125

Office Phone: (734) 936-0357

FAX: (734) 647-3170

 

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