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Kostas


17 total contributions since 2019

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Question


Convergence with fsolve?
Hi all, I was trying to solve a system of equations using fsolve that I havent' been succesfull in doing so. So I have the fol...

23 days ago | 0 answers | 0

0

answers

Question


Simscape custom component to have one parameters unit change depending on the input of another parameter
Hi all, I am creating a custom simscape block and it all works fine, except the units. The equation is Torq = D1*w + D2*w^PE a...

24 days ago | 0 answers | 0

0

answers

Answered
How to dynamically size arrays in Simscape custom component?
Have you tried writing right next to your inputs something like: inputs (Size = Variable). I do not know if it works but it is s...

24 days ago | 0

Question


Simscape/Simulink algebraic loop causing trouble?
Hi all, I have created a 2 degree of freedom model of an engine driving a propeller with a 'flexible crankshaft' modelled in s...

24 days ago | 0 answers | 0

0

answers

Answered
How to make a new Simscape model in ".ssc" File.
Well.. I was running into the exact same problem as @Yji Ito and @Chris Matthews run into. After experimenting I managed to get ...

25 days ago | 0

Question


Simulink 'To File' Block: How to save simulation outputs as distinct vectors
Hi all, How is it possible to save in simulink a bunch of simulation outpus in the same .mat file (using the 'To File' block),...

26 days ago | 1 answer | 0

1

answer

Answered
Loading Files of Similar Names into Script
Hi there, Would the code below help? Essentially you can use sprintf function to create a cell array with all the file names...

28 days ago | 0

| accepted

Question


Simulink error: The data abscissae must be distinct and strictly monotonic.
Hi all, I have constructed a simulink model, where within the model I have a MATLAB function block as you can see. Within that ...

28 days ago | 1 answer | 0

1

answer

Answered
Solver for nonlinear second order ODE has large residuals when mass matrix becomes state dependent
I ended up solving the above equation with sufficiently low residuals, by choosing a sufficiently small tspan and running the od...

29 days ago | 1

| accepted

Question


Solver for nonlinear second order ODE has large residuals when mass matrix becomes state dependent
Hi all, I currently have a nonlinear second order ODE that when I try to solve with any of MATLAB's ODE solvers, I get unaccep...

1 month ago | 2 answers | 0

2

answers

Question


ode45 unexpected behaviour for initial conditions = 0
Hi all, I have a code where I am using it to solve the following differential equation: In specific, the above is a 4x4 sys...

1 month ago | 1 answer | 0

1

answer

Question


How to determine convergence of ode45
Hi all, I was wondering how it is possible to determine convergence of ode45 for a simple damped mass-spring system. So here i...

2 months ago | 0 answers | 0

0

answers

Question


How to extract the value of dydt from ode45 function
Hi all, I have written a code of a damped mass-spring system, that takes as inputs the relevant mass, damping, stiffness and ex...

2 months ago | 1 answer | 0

1

answer

Question


Change from set notation to dot notation
Hi all, Just in order to keep uniformity in my code, I would like to know if its possible to change the below expression fro...

4 months ago | 1 answer | 0

1

answer

Answered
ODE45 Multiple Degrees of Freedom
I have found the problem, and as I suspected, it was in the function. the correct function is: (i still don't fully understand...

4 months ago | 0

Question


ODE45 Multiple Degrees of Freedom
Hi all, I am having difficulty in modelling a 3DOF system usng ODE45 as I am not getting the correct result. Therefore I woul...

4 months ago | 2 answers | 0

2

answers

Question


ode45 does not return the right answer for internal combusion engine pressure profile
Hi all, I have been getting plenty of practice the last few days with ODE45 and there is one problem I am trying to solve that...

4 months ago | 0 answers | 0

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answers