CoppeliaSim forums

Hi,
I want to build a 2-DOF landing platform as shown below
https://drive.google.com/file/d/10Y2eGk ... sp=sharing
I started with 1-DOF and have a problem connecting the joints. Please see the scene below
https://drive.google.com/file/d/1HkR_EV ... sp=sharing
What I want is to control the position of the prismatic joint (PJ)to rotate the platform and the other joints to be free.
I used the loop closure configuration but could not get to work. Any help would be appreciated
Thank you,

Hello,

sorry for the delay.
Your approach is generally correct. You only need to be very careful to not overconstrain your mechanism. In the scene you posted, you will need a spherical joint instead of the revolute RJ1.
Then, make sure to work with appropriate masses and inertias. Have a look at design considerations 7 & 8 on this page.
Also, switch from one engine to another from time to time, to see if that makes a difference.

Cheers

Thanks for the reply! Everything is fine with landing platform now.
I have another question if you don't mind. I am trying connect V-REP to MATLAB through B0-based remote API and getting the following errors/warnings:

for simpleTest.m
Warning: The following error was caught while executing 'b0RemoteApi' class destructor:
The following error occurred converting from containers.Map to double:
Error using double
Conversion to double from containers.Map is not possible.
> In simpleTest at 43
Undefined variable client.

Error in simpleTest (line 66)
client.delete();

for testing.m
Warning: The following error was caught while executing 'b0RemoteApi' class destructor:
The following error occurred converting from containers.Map to double:
Error using double
Conversion to double from containers.Map is not possible.
> In testing at 6
Undefined function 'dumpmsgpack' for input arguments of type 'cell'.

Error in b0RemoteApi/handleFunction (line 297)
packedData = dumpmsgpack({{funcName,obj.clientId,topic,0},reqArgs});

Error in b0RemoteApi (line 136)
obj.handleFunction('inactivityTolerance',{obj.inactivityToleranceInSec},obj.serviceCallTopic);

Error in testing (line 6)
client=b0RemoteApi('b0RemoteApi_matlabClient','b0RemoteApi');

What to do to get rid of them?
P.S. I was able to connect V-REP to C++ through B0-based remote API, so I think I have all the required libraries.