Modeling of the Damping Contributions of O-rings in a Submergible Six-Axis Load Cell.

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Title: Modeling of the Damping Contributions of O-rings in a Submergible Six-Axis Load Cell.
Author: Davis, Luke Allen
Advisors: Dr. Eric Klang, Committee Member
Dr. Eddie Grant, Committee Member
Dr. Kara Peters, Committee Chair
Abstract: The objective of this research is to provide general guidelines and calibration procedures to accurately model and improve the response time of submergible 6-axis load-cells based on multiple beam configurations sealed with compressible o-rings. This objective is achieved by adding a damping contribution to the existing stiffness model through an appropriate time derivative function. Data collection parameters are experimentally determined to control the noise and prevent the time derivative from becoming unstable. The effects of o-ring type and material properties on the stiffness of a particular submergible six-axis load cell are determined. Following the stiffness study, the damping matrix is derived from data collected during various loading cases, assuming that the damping effect can be modeled as constant in time. A comparison of the effect of material properties, results from stiffness tests, and other data are performed to determine their effect on the damping matrix. Finally, the assumption of constant damping is evaluated through the comparison of the modeled response to the measured system response.
Date: 2006-04-28
Degree: MS
Discipline: Mechanical Engineering
URI: http://www.lib.ncsu.edu/resolver/1840.16/1940


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