THE FRICTION MEASURING MACHINE: AN ENERGY-BASED APPROACH TO FRICTION CHARACTERIZATION

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Lomascolo, C. (2017). THE FRICTION MEASURING MACHINE: AN ENERGY-BASED APPROACH TO FRICTION CHARACTERIZATION. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Friction has been studied and analyzed through the years. The need for precise friction measurement has become increasingly important as the need for precision positioning mechanism has increased. This precise control of mechanical systems requires the knowledge of specific parameters in the system. A subset of these parameters is the friction model. Traditionally, friction models are parameterized using steady-state force measurement during sliding contact. In this thesis, a new displacement-based friction measurement machine is designed and constructed, where linear motion is prescribed using a parallelogram leaf-type flexure. The flexure has a natural frequency of 2.24 Hz, a stiffness of approximately 1955 N/m (the average of the two different tests), and a viscous damping ratio of 0.00085. The parasitic motion at a displacement amplitude of 10 mm is less than 0.1 μm and the uncertainty of the relative position of the two samples due to structural deflection is 1 μm.

Details
Author

Lomascolo, Christian

Title

THE FRICTION MEASURING MACHINE: AN ENERGY-BASED APPROACH TO FRICTION CHARACTERIZATION

Physical Description

1 online resource (82 pages) : PDF

Date

2017

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Friction has been studied and analyzed through the years. The need for precise friction measurement has become increasingly important as the need for precision positioning mechanism has increased. This precise control of mechanical systems requires the knowledge of specific parameters in the system. A subset of these parameters is the friction model. Traditionally, friction models are parameterized using steady-state force measurement during sliding contact. In this thesis, a new displacement-based friction measurement machine is designed and constructed, where linear motion is prescribed using a parallelogram leaf-type flexure. The flexure has a natural frequency of 2.24 Hz, a stiffness of approximately 1955 N/m (the average of the two different tests), and a viscous damping ratio of 0.00085. The parasitic motion at a displacement amplitude of 10 mm is less than 0.1 μm and the uncertainty of the relative position of the two samples due to structural deflection is 1 μm.

Genre

masters theses

Subjects--Topics

Mechanical engineering

Degree

M.S.

Keywords

Flexure
Friction
Machine
Precise
Precision
Tony Schmitz

Subject Area

Mechanical Engineering

Advisor(s)

Schmitz, Tony

Committee Members

Ziegert, John
Smith, Stuart

Degree Note

Thesis (M.S.)--University of North Carolina at Charlotte, 2017.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Lomascolo_uncc_0694N_11413

Permalink

http://hdl.handle.net/20.500.13093/etd:1718