Quiz question 1 has 1 incorrect and other misleading answers.
The question is phrased: "In order for a quadrotor to hover in place, i.e., maintain a constant x, y, z position, which states must equal zero? (HINT: there should be 8 check marks). You can assume that all external disturbances are equal to zero."
The question requires the following boxes to be checked in order to be marked correct:
phi (roll angle)
theta (pitch angle)
psi (yaw angle)
dx/dt
dy/dt
dz/dt
d(phi)/dt
d(theta)/dt
d(psi)/dt
First, there's no reason why d(psi)/dt needs to be zero in order for x,y,z to be constant. For example, the quad could be rotating at a constant rate about its center of mass after a maneuver is complete.
Secondly, even though the question says all disturbances are zero, it may be misleading to some students to think that all of these values must always be zero to maintain a constant position when in reality they would be constantly changing in order to maintain position (even if dx/dt, dy/dt, dz/dt were able to be maintained near zero).
Quiz question 1 has 1 incorrect and other misleading answers.
The question is phrased: "In order for a quadrotor to hover in place, i.e., maintain a constant x, y, z position, which states must equal zero? (HINT: there should be 8 check marks). You can assume that all external disturbances are equal to zero."
The question requires the following boxes to be checked in order to be marked correct: phi (roll angle) theta (pitch angle) psi (yaw angle) dx/dt dy/dt dz/dt d(phi)/dt d(theta)/dt d(psi)/dt
First, there's no reason why d(psi)/dt needs to be zero in order for x,y,z to be constant. For example, the quad could be rotating at a constant rate about its center of mass after a maneuver is complete.
Secondly, even though the question says all disturbances are zero, it may be misleading to some students to think that all of these values must always be zero to maintain a constant position when in reality they would be constantly changing in order to maintain position (even if dx/dt, dy/dt, dz/dt were able to be maintained near zero).