Reducing the influence of Karman vortices on oscillations of a sensing element of a vane type aerodynamic angle sensor

Aerodynamic angle sensors (AAS) of a vane type are widely used in aviation to obtain information on aerodynamic angles of attack and sideslip. Their vane sensing elements are installed in the oncoming airflow. It is shown that during AAS operation, in addition to external atmospheric disturbances of the oncoming airflow, the vane sensing element is adversely affected by Karman vortices formed during periodic flow separation from adjacent streamlined surfaces of the vane. This necessitates studying the influence of Karman vortices on the vane sensing element oscillation within the AAS operating ranges. Models describing the proper motion of the vane sensing element in the aerodynamic angle measurement mode, models of Karman vortex parameters, and models of the influence of Karman vortices on the amplitude and frequency of forced oscillations of the vane sensing element are presented. The results of testing the obtained models are demonstrated, indicating the possibility of reducing the amplitude of oscillations of the weather vane sensitive element and the output signal of the weather vane AAS.

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