An Experimental Study on Reducing Ramp Stress Levels Using "Smart" Damping

Master's Thesis

Abstract

The United States military has taken an increasing interest in offloading equipment and machinery from Roll-On/Roll-Off (RO/RO) vessels in open seas. However, the current design of the RO/RO Discharge Facility (RRDF) has been determined to be structurally inadequate in sea state 3, in that relative roll motions between the ship and the RRDF induce stresses above yield. This project focuses on experimentally evaluating the efficacy of the Ramp/RRDF Motion Compenstation/Mitigation System proposed by Yang and Spencer on a laboratory-scale ship/ramp/RRDF system utilizing magnetorheological (MR) fluid dampers. Design of the experimental model, verification of the dynamic properties of the system, characterization of the dampers, system identification, control design, and experimental testing are discussed. Results appear to be promising, in that semi-active control achieves performance gains over uncontrolled and optimal passive cases.

Attributes

Attribute NameValues
URN
  • etd-04092004-100406

Author Aaron Matthew Vorwerk
Advisor B.F. Spencer, Jr.
Contributor B.F. Spencer, Jr., Committee Chair
Contributor David J. Kirkner, Committee Co-Chair
Contributor Yahya C. Kurama, Committee Member
Contributor Tracy L. Kijewski-Correa, Committee Member
Degree Level Master's Thesis
Degree Discipline Civil and Environmental Engineering and Earth Sciences
Degree Name MSCE
Defense Date
  • 2004-04-02

Submission Date 2004-04-09
Country
  • United States of America

Subject
  • structures

  • structural dynamics

  • damping

  • smart damping

  • magnetorheological fluids

  • magnetorheological

  • dampers

  • MR

  • MR dampers

  • MR fluid

Publisher
  • University of Notre Dame

Language
  • English

Record Visibility and Access Public
Content License
  • All rights reserved

Departments and Units

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