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We describe an analog CMOS VLSI system that can process real-time signals from surface-mounted shear stress sensors to detect regions of high shear stress along a surface in an airflow. The outputs of the CMOS circuit control the actuation of micromachined flaps with the goal of reducing this high shear stress on the surface and thereby lowering the total drag. We have designed, fabricated, and tested parts of this system in a wind tunnel in both laminar and turbulent flow regimes.

F. Jiang, B. Gupta, C. Ho, S. Tung, Y. Tai and R. Goodman, "Analog VLSI System for Active Drag Reduction," in IEEE Micro, vol. 16, no. , pp. 53-59, 1996.
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