Measurement of Solid Surface Motion Using Stereo Particle Image Velocimetry Methodology

Open Access
Dowell, Grant R
Area of Honors:
Aerospace Engineering
Bachelor of Science
Document Type:
Thesis Supervisors:
  • Michael H Krane, Thesis Supervisor
  • Philip John Morris, Honors Advisor
  • George A Lesieutre, Faculty Reader
  • Particle Image Velocimetry
  • PIV
  • Fluid Structure Interactions
  • FSI
  • Stereoscopic Particle Image Velocimetry
  • SPIV
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.