Title page for ETD etd-06162009-063052


Type of Document Master's Thesis
Author Horvath, Istvan
URN etd-06162009-063052
Title Development of a cantilever beam, capacitive sensing, skin friction gage and suppporting instrumentation for measurements
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Wicks, Alfred L. Committee Chair
Dancey, Clinton L. Committee Member
Diller, Thomas E. Committee Member
Keywords
  • Skin friction (Aerodynamics)
Date of Defense 1993-05-15
Availability restricted
Abstract

A cantilever beam type, capacitive sensing, skin friction gage has been developed. A prototype along with supporting electronics has been constructed. The cantilever beam gage is a change of area variable capacitive transducer. It is designed to measure the wall shear stress in a short duration, supersonic flow. The supporting electronics consists of an electrical oscillator for frequency modulation, and a frequency demodulator. The change in capacitance due to the shear stress in the flow modulates the output signal of the oscillator, which is then demodulated to extract a voltage signal which corresponds to the change in capacitance of the gage. The gage and the electronics were constructed from simple, inexpensive components for the purpose of proving the concept of a capacitive sensing transducer. static calibrations have been completed and statistical analysis has been done to test the performance of the gage. A 0.12 mV response due to the expected 98.1 g m/s2 force input of the skin friction of the Mach 2.9 design flow, over the 0.49 in2 (316.1 mm) area of the gage's sensing head, was measured as the average output of the skin friction gage instrumented with stainless steel strips.

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