Pulling stuck vehicle with another vehicle using 1 pulley

Hello,

I would like to ask whether it is possible to simulate pulling vehicle A, that is ,,stuck,, using vehicle B with pulley system. How would I go about creating this in simulink ?

Any help is appreciated.

[John D'Errico]

Of course it is possible, but not until you sufficiently define the situation. What does "stuck" mean?

Is the vehicle in mud up to the roof? (I can show you pictures and videos of this.)

Is the vehicle sitting off the ground, with all 4 wheels spinning? (Entirely possible, since it happened to me in a snow bank, trying to get into my own driveway, despite the presence of AWD.)

Is the vehicle in a ditch, in which case the power of the vehicle's motor is not sufficient to pull up the incline out of the ditch. (I've also had this happen.) Or, maybe one wheel is spinning freely, for a vehicle with an old style differential.

Is the problem simply a lack of friction, maybe the presence of ice is a factor?

Is there a tree blocking the way, in which case "stuck" takes on an entirely new meaning?

Is the vehicle able to add its own power to the process, or is this effectively a dead body to move?

The point is, you will need to fully define and understand all forces on the vehicle. Once you do so, there are examples that even I can find.

https://www.mathworks.com/matlabcentral/answers/657593-pulling-against-gravity-with-a-pulley-system?s_tid=answers_rc1-1_p1_MLT

https://www.mathworks.com/matlabcentral/answers/524044-simscape-cable-and-pulley?s_tid=answers_rc1-2_p2_MLT

https://www.mathworks.com/matlabcentral/fileexchange/66519-simscape-multibody-belts-and-pulleys-examples?s_tid=answers_rc2-3_p6_MLT

[Kristián]

Sorry for lack of description. Let´s say vehicle B was damaged and can not move on it´s own. Dead engine and we have to pull it using winch and 1 pulley. Vehicle A is stationary and unmovable. Make it as simple as can be. I just need to simulate, if power of the winch is sufficient. Do you by any chance have example of this ? Thank you for reply

Answer 1

[Sam Chak]

Hi @Kristián

Describing the motion of the pulley system usually requires the mathematical model, specifically the differential equations for the pulleys. With the equations, you can build the math-based blocks in Simulink accordingly.

However, even without the equations it is still possible to build pulley system in Simulink using Simscape "Multi-body" physical blocks. However, building such a physical system requires highly imaginative and intuitive skills of how things work and connected physically, instead of mathematically. Beginners are usually advised to build the system according to the actual physical body diagram as shown below:

https://www.mathworks.com/help/sm/ug/block-and-tackle-with-four-pulleys.html