Analysis of a kite anemometer
Abstract
Equations of motion for a rigid, tailless kite and tether system are derived from free body diagrams. A direct, analytical solution of these equations provides tether tension in a steady wind. Numerical solutions of linearized equations of motion provide the kite tether tension in a transient, turbulent wind field. A similar analysis is applied to a kitetailtether system. The results of these analyses show that line tension at the ground anchor is within a few percent of tether tension at the kite. Wind shear does not significantly affect line tension. Thus the tethered kite anemometer can measure heightdependent wind fields based on steadystate, uniform wind calibrations. Unsteady winds also have an insignificant effect on the tether if gust amplitude and frequency are such that tether accelerations are below 9.8m/s(2). In a variable wind, tether tension is in phase with wind variations. Tension amplitude is dependent on the magnitude and frequency of wind variations.
 Publication:

Final Report FWG Associates
 Pub Date:
 December 1981
 Bibcode:
 1981fwga.rept.....H
 Keywords:

 Anemometers;
 Equations Of Motion;
 Numerical Analysis;
 Speed Indicators;
 Tethered Balloons;
 Wind Velocity Measurement;
 Analysis (Mathematics);
 Measuring Instruments;
 Partial Differential Equations;
 Wind Measurement;
 Instrumentation and Photography