Measurement of Solid Surface Motion Using Stereo Particle Image Velocimetry Methodology

Open Access
Author:
Dowell, Grant R
Area of Honors:
Aerospace Engineering
Degree:
Bachelor of Science
Document Type:
Thesis
Thesis Supervisors:
  • Michael H Krane, Thesis Supervisor
  • Philip John Morris, Honors Advisor
  • George A Lesieutre, Faculty Reader
Keywords:
  • Particle Image Velocimetry
  • PIV
  • Fluid Structure Interactions
  • FSI
  • Stereoscopic Particle Image Velocimetry
  • SPIV
Abstract:
The measurement of structure motion in fluid flows is often problematic for researchers. Devices attached to the structure affect the fluid flow or the structure?s material properties. Optical techniques offer a non-invasive alternative but have difficulty obtaining both spatially and temporally accurate measurements. For example, scanning laser vibrometers provide time- accurate velocity measurements at a single point, but are limited by the time necessary to scan entire structures. By comparison, Stereo Particle Image Velocimetry (SPIV) is typically used to measure 3-dimensional, seeded fluid flows and provides time-resolved measurements over large spatial regions. This paper presents a novel application of SPIV to measure the motion of optical markers on a deformable solid surface. The effectiveness of this approach was evaluated empirically using a flexible, rectangular bar, set in motion by a shaker. SPIV measurements were taken simultaneously with accelerometers mounted on the surface of the bar. Capabilities of the SPIV system were evaluated by detection of a node point in the surface velocity distribution. These results were compared with a node detection using the attached accelerometers.