Recent content by Leo Liu

Hi I am back :). I have been doing some Simulink modeling for a project. I modeled it with a discrete system due to the controller rate. I have noticed that for all the discrete system I have tried, adding a derivative filter not only improves the performance (smaller settling time), but it is...

One more question: Suppose the acceleration ##\ddot x## is approximately constant during a finite ## \Delta t##, is the displacement due to this contribution best described by ##\frac 1 2 \ddot x (\Delta t)^2## or ##(\ddot x \Delta t)\Delta t##?

Could you elaborate, please?

Can I do this on an Arduino? It needs to be computed real time.

Question: Suppose I have a data file for the acceleration of an object after every ## \Delta t_i##, how do I obtain the displacement of it? Context: Integral in a PID loop, although not exactly what I am asking as one is sum of error: $$\int_0^T \int_0^T \ddot {\vec \theta(t)}dtdt$$ the other...

My IMU module is actually able to do a sensor fuse though all the calculations are done in a black box. I have made this post to understand what's going on behind the scene, but I guess I will just use that for now. Thanks for the help.

Haven’t decided yet. Most likely TVC without fins. But for now I just want to record data during a flight.

Does integrating the body rates give the true orientation? How do I convert body rates to angular speeds under an inertial frame?

The gyro has 6 inertial axes and 3 magnetic axes. How do I make them work together to get the orientation of the rocket in the reference fixed to the ground? I found something from Matlab but I am not sure how it works...

So I understand that for an airliner to make a turn, the plane has to use ailerons to roll to one side to shift the lift to create a centripetal acceleration, and because of the drag difference of the two wings, the rudder might also turn to that direction to correct for the adverse yaw. I'd...

If the flights of our model plane are designed to be powered throughout, will it change the requirement here? We don't want to waste energy by making the plane climbing up. The wingspan is a mere 600mm so we can only use two coreless DC motors to power the flying wing. Hmmmm our plane will use...

Thanks for the answers. By stability I actually meant longitudinal stability rather than directional. From my understanding the wing sweep shifts the lift behind the CoM, but I don't quite understand how this works without reflex which creates a positive moment about the aerodynamic center...

My school's group project is to design a powered model flying wing that can fly for as long as possible. To make it stable in the longitudinal direction, we either have to use a swept wing design or an airfoil with reflex (like BR1). We are forced to use wing sweep because the airfoil with...

I am trying to determine how the addition of a counterweight affects the ##C_m-\alpha## (in longitudinal direction) graph for a model plane project, where the counterweight can be considered as the battery. Suppose we try to place the battery at the back of the current CoM. The new CoM will...

Thanks a lot! It is working now!