GEM STABILITY AND QUALITY CONTROL STUDY.
GARRETT CORP PHOENIX ARIZ AIRESEARCH MFG DIV
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Four main steps were taken to define control and stability requirements. The first step was to write general equations of vehicle motion. This was done on the basis of transient perturbations relative to steady-state motion. The second step was to evaluate the various forces. Forces acting on the Ground Effect Machine GEM are air cushion pressure, aerodynamic forces, propulsion forces, and control forces. Lift and moment due to air cushion pressure was calculated on the Bendix G-15 digital computer. Aerodynamic lift, drag, and center of pressure were obtained from known results for symmetrical bodies. Propulsion and control systems which use the air cushion pressures are being analyzed on the digital computer because of the intimate interactions within the air cushion and the nonlinear nature of the problem. The forces produced by controls will be verified in the model test program. The third step is to solve the general equations of motion using the forces obtained in step two. The fourth step is to determine the desired control characteristics. This will be done by first linearizing the equations of motion and determining a suitable control transfer function from linear stability considerations and then simulating this control function on the analog computer with the more complete representation of vehicle characteristics. Author
- Surface Effect Vehicles and Amphibious Vehicles