How to run a Simulink example by not going through the whole coded tutorial? (mech_moto​rcycle_sta​bility)

One of the SimMechanics examples in Simulink models a motorcycle to perform a linear stability analysis on it. This example can be called by entering "mech_motorcycle_stability" in the command window.

The only way to run the code is to double click the top left box to start the example. I would like a way to get the results without having to do that.

I can simply run the Simulink model, and it does what it needs to do, but then when I try and use the results by using the code that the tutorial says you should use:

locus = [];
for i=1:20, % Extract 20 linearizations.
 vu = 53.5*(i-1)/19;                        %Speed range 0 to 53.5 m/s.
 disp(['Current speed is: ',num2str(vu)]);
 motorcycle_dat                             %Compute the vertical tire force and tire model coefficients.
 [A,B,C,D] = linmod('mech_motorcycle_stability');             %Linearize the dynamics at the specified speed.
 locus(:,i) = eig(A);                        %Define locus of eigenvalues.
end;
echo off;

it does not work because the motorcycle_dat cannot be found (I also have no idea where it comes from). However I know the model works because when you go through the whole tutorial, it produces a root locus plot at the end.

So essentially I am looking to find out where and what "motorcycle_dat" is because I think when I have that, then I can run the code and produce results without having to go through the whole worked tutorial.

(Try enter "mech_motorcycle_stability" without the quotation marks to see what I mean about going "through the whole worked tutorial")

[ali KHALILI]

how we can run the code with motorcycle_dat?

Answer 1

[Steve Miller]

Hi Nicholas,

The lines of code you have copy/pasted have a typo in them.

It should be mech_motorcycle_data, not motorcycle_dat.

The correct code is visible in >>mech_motorcycle_stability_example.m, which is part of Simscape Multibody First Generation technology and examples, available in earlier releases of Simscape Multibody.

--Steve