Specifications

CT Corsair Final Report May 2, 2014

by the microcontroller. Their purpose is to protect the machine from exceeding its limits by

providing positional analog voltage information from the two induction motors.

Figure 8. Induction Motor Encoder Feedback via Potentiometer

This custom feedback device was selected for use on the simulator for several reasons. First, the

encoders are very old and no support exists for their model and datasheets are nearly impossible

to find. The encoder manufacturers provided minimal assistance in understanding their workings.

Second, while testing motor shaft positions, the encoder output a 16-bit value of all ones or all

zeros and nothing in between. Code developed by both the electrical and computer engineering

team members produced these same results. Finally, future work on the simulator will require the

installation of two more servo motors which will render the induction motors and all parts

pertaining to them obsolete. Thus, potentiometer feedback was selected as the more viable

option.

4 Project Specifications

4.1 Simulator Motion Definitions and Requirements

The Gyro IPT flight simulator has a triangular base plate where the cockpit rests. There are three

actuating pushrods, three scissor arm attachments and a central universal joint surrounded by a

supportive spring. As previously stated, the simulator had three induction motors to control pitch,

roll, heave and vestibular movements of the simulator.

Pitch is defined as the rotation of the simulator about its center x

axis and is controlled by the front drive motor. Pitch is used to

simulate climbing, diving and acceleration. Roll is defined as the

rotation of the simulator about its center y-axis and is controlled by

the two side drive motors. Rotation of the simulator about its y-axis

allows for the simulation of turns and rolls. Heave is defined as

vertical excursions in the z-direction from the home position. It is

controlled by all three drive motors working in unison to provide

lift. Heave simulates runway roughness, landings and turbulence.

Vestibular movements are defined as movements which stimulate the

inner ear balance system and can be used to give the user a sensation

of acceleration.

Yaw is the rotation about the vertical z-axis. This maneuver is to be controlled by the ‘spin’

motor and is outside the scope of this project phase.

Figure 9. Axes of motion for

simulator platform