Dynamic stability research conducted in Langley Research Center (LaRC) transonic and supersonic wind tunnels employs a technique in which the model is mechanically forced to oscillate in the wind-stream at a fixed amplitude and frequency. A specially built oscillating balance in used to measure the input mechanical displacement and the corresponding aerodynamic loads of the test model. The load signals are resolved into complex phasors relative to the displacement signal for computation of stability and damping coefficients. This paper describes a new system employing digital signal processing (DSP) microcomputers to replace existing electro-mechanical instrumentation designed over 30 years ago.
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