Motion simulator using simulink

Hello Everyone,

I'm new to simulimk so excuse me..

So, using simulink it was needed to simulate the motion of ball with

D is drag and

So given some values of S=1, Cd=0.7 (-) and initial position and initial velocity

the model needs to plot z vs t and V vs t and the trajectory of the ball in x-z plane until the ball touches the ground (i assume z=0 so we dont need to use memory block)

I did this model but apparently its not working well (the model itself is wrong I guess)

Thank you in advance

Answer 1

[Sam Chak]

Hi @Wajih IMLIKI

You multiply v with v, and then you take a square root of v²? In order to get the absolute value of v? By the way, what is the coordinate system of v? Is it x, y, or z? You are advised to sketch a Free Body Diagram so that you can interpret it correctly.

Perhap you rectify this issue and see if there is any error message pops up.

[Wajih IMLIKI]

I did dot product then sqaure root to get the magnitude of the vector i didnt find a block for it, and concerning the coordinate system its x-z

[Sam Chak]

Is the ball falling in the direction of z, or both x and z?

[Wajih IMLIKI]

its 2D motion so on both x and z, and V has both x and z components

[Sam Chak]

I see. Can you provide the equations of motion separately for the x-direction and z-direction?

I'm not sure if MATLAB has a special symbolic function for resolving vectors into perpendicular components.

I think this function maybe useful:

https://www.mathworks.com/help/symbolic/norm.html