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 Expert  108076

Expert in Machine Tools, Semiconductor Process Equipment, Machine Dynamics, Metrology


Available for your Consulting and Expert Witness Needs

Pennsylvania (PA)
USA
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness

Summary of Expertise:

Listed with other top experts in: 

In his research on structural dynamics, Expert employs the techniques of finite element analysis extensively. He regularly uses ANSYS, NASTRAN, Pro/Engineer, and SDRC Master Series in analyzing a variety of static, transient, thermal, and eigenvalue problems. Examples of his recent work include the design of components used in machine tools, photolithography stages, and CT scanners. Most of this work emphasizes the efficient use of material to reduce cost and manufacturing time while maximizing static and dynamic stiffness. Additional work has been done to predict the damping available from viscoelastically-damped structures.

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finite element analysis

Expert's government- and industry-sponsored work in regenerative chatter has led to new models in machine tools, including generalization of the classic orthogonal cutting model to other tool geometries. Exhaustive experimental investigation has been used to verify analytical models. His ongoing research is currently expanding the understanding of chatter in grinding, which has received much less attention from past research. At present, Expert is heavily involved with machine tool builders seeking to develop machine designs capable of heavy cutting and grinding without experiencing chatter. His recent projects include machining centers, cylindrical and centerless grinders, and wafer polishing machines.
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chatter

Understanding that machine vibration arises from a variety of sources, Expert has studied rotating imbalance, high-speed actuation, pump vibration, and others. His experience in machine vibration also includes measuring and interpreting these vibrations. He has measured particular vibration characteristics with sensors such as accelerometers and capacitance gages. He has designed solutions such as damping treatments, structural reinforcement, and proper balancing.

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machine vibration

Modal analysis is a power method of identifying the characteristics of a structure. The results of an analytical (FEA) or experimental modal analysis may be used to improve the dynamic characteristics of a structural design. Expert's experience with modal analysis has been primarily aimed at identifying the key dynamic characteristics of a particular structure and working towards improvement. Examples of his work include the redesign of machine tool structures with increased damping and stiffness, understanding the structural problems of the individual semiconductor process equipment, and measuring the characteristics of different prototypes to create a better final design.
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modal analysis

Modal analysis is a power method of identifying the characteristics of a structure. The results of an analytical (FEA) or experimental modal analysis may be used to improve the dynamic characteristics of a structural design. Expert's experience with modal analysis has been primarily aimed at identifying the key dynamic characteristics of a particular structure and working towards improvement. Examples of his work include the redesign of machine tool structures with increased damping and stiffness, understanding the structural problems of the individual semiconductor process equipment, and measuring the characteristics of different prototypes to create a better final design.
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machine vibration analysis


Show Secondary and Basic Areas of Expertise
Localities:
Expert may consult nationally and internationally, and is also local to the following cities: Lancaster, Pennsylvania;  and Frederick, Maryland.

Education:
Year   Degree   Subject   Institution  
1994   Ph.D.   Mechanical Engineering   Massachusetts Institute ofTechnology  
1992   M.S.   Mechanical Engineering   Massachusetts Institute ofTechnology  
1990   B.S.   Mechanical Engineering   University of Illinois-Urbana-Champaign  

Work History:
Years   Employer   Department   Title  

1994 to

 

(Undisclosed University)

 

Mechanical Engineering

 

Associate Professor

 

1990 to

 


 


 

Independent Engineering Consultant

 

1992 to 1994

 

Massachusetts Institute of Technology

 

Precision Engineering Research Center

 

Research Assistant

 

1990 to 1992

 

Massachusetts Institute of Technology

 

Martin Center for Engineering Design

 

Research Assistant

 

Career Accomplishments:
Associations/Societies

Expert is a member of the American Society of Precision Engineers and the American Society of Mechanical Engineers.

Awards/Recognition

The recipient of a variety of honors, Expert won a R&D 100 Award, MIT's Carl T. Sontheimer Award, the National Tool Builders Association Scholarship, the ASME Scholarship, the General Motors Scholarship, and the A.G. Friedrich Memorial Award.


Publications:
Publications and Patents Summary

He holds a U.S. patent for shear damping of machine tool structures.

Selected Publications and Publishers  
 - Journal of Sound and Vibration  
 - American Society of Mechanical Engineers, International Mechanical Engineering Congress and Exposition  
 - Proceedings of the Int. Conf. on Precision Eng. Japanese Soc. of Precision Engineering.  
 - Future Fab International  
 - Precision Engineering  

Consulting Services:
Selected Consulting Examples:
  • Expert's consulting experience involves dozens of companies in the semiconductor and machine tool industries. Most of his engagements lead to the solution of a vibration-related problem or a structural dynamics issue. The solutions have led to numerous designs that are now in production. A typical scenario involves collecting vibration data followed by analyzing the problem and designing a solution in cooperation with the machine's builder.
Recent Client Requests:
  • Semiconductor expert for consulting on metrology.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Recent Litigation Client Requests:
  • Expert in internal combustion engines for consulting on crankshaft rotary torsional vibration.
  • Expert in CNC lathe for consulting on allegations that the machine was unsafe and did not contain adequate warnings.
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

Additional Skills and Services:
Training/Seminars

Expert has given seminars in a variety of fields related to machine tools and semiconductor process equipment dynamics. Titles include "Methods for Achieving Damping in Machine Tools and Components," "Innovations in Improving Machine Tool Performance," "Machine Tool Structural Design," and Design for Damping in Precision Machines."


 

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