MaplePrimes - MapleSim 2019 Posts and Questions

Using Python and MapleSim for teaching ODE

Lenin Araujo Castillo — Sat, 21 Aug 2021 13:42:52 Z

This research work demonstrates the use of the MapleSim and Python scientific packages for the correct use of differential equations for engineering students, in the face of the pandemic generated by COVID-19. The main objective is to visualize the teaching and learning process of the subject presented. The methodology used is block diagrams using graphic programming and the one-dimensional symbolic structure. The results are totally optimal since automation was achieved in the differential equations applied to different engineering cases. The applications generated by the scientific software are fully upgradeable and available in the cloud.

Ponencia_CIMAC_2021.pdf

Lenin AC

Ambassador Maple

How can I generate differential algebraic equations with generalized coordinates in Maplesim?

MyTemp — Tue, 08 Sep 2020 14:04:07 Z

Hi,

I'm new to Maplesim and Maple. I've modeled a planar slider-crank mechanism in Maplesim and it works.

Now I want to extract the equations of motion (DAE) for further analysis. From 'Template' --> 'Worksheet', I used A:-GetEquations() to try to get the DAE. However, the equations are too long and not shown. Moreover, I don't know what coordinates Maplesim used to generated those 'unseen' equations. Here are the equations that can be hand-derived:

where I and m represent inertia and mass respectively. Theta, beta and s are the chosen generalized coordiantes, s_theta is sin(theta), c_theta is cos(theta), s_beta is sin(beta), c_beta is cos(beta). Rx and Ry are lagrange multipliers representing the reaction force in the pin between the crank and the connecting rod.

How can I generate such DAEs using Maplesim? Thank you very much.

How to inverse interpolate a 2D lookup table in MapleSim?

a_simsim — Thu, 09 Jul 2020 11:15:23 Z

Dear Community,

I would like to have an inverse interpolation with a 2D lookup table in MapleSim. The usual 2D lookup interpolation has u1 column values, and u2 row values, and a corresponding y table values, i.e. y = f(u1,u2). Now I would like to go the reverse way. Suppose I know y, and u2, and I would like to get u1. How can I implement this in MapleSim? An additional information is, that the 3D surface represented by the f(u1, u2) function is a smooth, slightly curved, monotonically sloping surface, so to any y value a unique pair of u1 and u2 values belong.

With my specific data, which are attached in the TestVLP.xlsx file:

u2 values are: 1^st row, cells 2 .. 14
u1 values are 1^st column, rows 2 .. 11
tabulated values are all the rest, i.e. from cell(2,2) .. cell(11,14)

Now for my case:

u2 = 42000.0
y = 94.5614

How much is u1? I know the correct answer from elsewhere, it should be something very close to u1 ~ 85. This y value is in the rectangle bordered by columns 7 .. 8 and rows 5 .. 6 in the Excel file.

So my question is how do I correctly implement this in MapleSim? As visible from the attached TestInverse2DInterpolation.msim file I tried to do it with an Inverse Block Constraints component and a horizontally flipped 2D Lookup Table (VLP) and Constants for y and u2, but upon running MapleSim I get an error message that no solution is found, although the solution is relatively easy and straightforward. May I ask you to have a look at it, what can be the problem here, what do I do wrong? I’m using MapleSim 2019.2.

Your kind help is appreciated in advance

best regards

Andras

TestInverse2DInterpolation.msim

TestVLP.xlsx

How to compare measured and calculated data in MapleSim?

a_simsim — Mon, 15 Jun 2020 06:14:42 Z

Dear Community,

I have a simulation in MapleSim, and I have a probe in the system, for which measured data are also available. How can I load these measured data into MapleSim and compare them to the calculated results (probe data) visually? (Preferably in the "Analysis Window: Simulation Results" which pops up by pressing F6)

Tx for the kind help in advance,

best regards,

Andras

MapleSim Setparameters in matrixform

j_e — Wed, 13 May 2020 08:32:49 Z

Hi,

I'm trying to change with a Maple Worksheet the parameters of a MapleSim Model in Real-matrices format.

is there any way to do that?

actually i get the failure note:

<<Error, (in SetParameters) non-vectorized values in vector parameters: [list= ""]>>

Thank You

Regards
Johann

why can't install maplesim2019 in maple2020?

hbaiMS — Sun, 15 Mar 2020 18:43:01 Z

Maple2020 was installed in windows 10 home. When installing maplesim 2019, it was looking for maple2019. Do I have to install maple 2019 before maplesim 2019?