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Rotationa to translation movement conversion - WITHOUT Simscape toolboxes

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Cyril  CRIER
Cyril CRIER 2020 年 8 月 19 日
コメント済み: Cyril CRIER 2020 年 9 月 15 日
Hello all,
I'm basically trying to simulate a Lead screw system, driven by a DC motor (Speed profile), on a certain stroke length. That being said, I just have the basic Simscape licence (it means No Driveline or Multi body toolboxes or licences).
I just don't know what to insert where the empty space are (see picture).
Typically, my speed profile has a trapezoidal form, I have a "Angular velocity Source" block, as well as a "Translational velocity Source" block which I don't know how to link. The gain is the pitch of the screw (in mm/rev).
If you have any idea on how to do, I'm looking forward your answers.
Thank you.

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Jonas
Jonas 2020 年 8 月 19 日
編集済み: Jonas 2020 年 8 月 19 日
Doesn't it make sense to just connect the speed profile on the linear velocity source, and use a regular Simulink Gain block to do the conversion between rotational and translational?
If you want to keep having the DC-motor there - which doesn't really do all that much at the moment - you can use an Ideal Rotational Motion Sensor. That sensor output needs to be converted to Simulink (PS -Simulink Converter), use a regular Gain block and then again convert to Simscape (Simulink-PS Converter).
You will also like to add something to the output of the DC Motor, such as a Rotational Free End, or an Inertia or Friction.

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Jonas
Jonas 2020 年 8 月 19 日
You could also use the Physical Gain block, yes. Although I have never used it, but it should work fine.
Cyril  CRIER
Cyril CRIER 2020 年 8 月 21 日
Hi, well the gain block looks ok but I have an arror with the solver now (see picture).
I've got this issue since I added a second signal for the torque profile.
I don't understand this issue. Anybody got already this error?
Thanks
Cyril  CRIER
Cyril CRIER 2020 年 8 月 26 日
Edit:
I figured out what the issue was with the solver. In my first attent, I created a infinite loop by connecting the C port of my Tranlational Hard stop which is also connected to the Ideal Force Source block. The solution is to connect the C port to the Mechanical reference.

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その他の回答 (1 件)

Franck Donnadieu
Franck Donnadieu 2020 年 8 月 25 日
Hello, is this model is ok for you?

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Cyril  CRIER
Cyril CRIER 2020 年 8 月 26 日
Hi, that's great thank you for these informations.
Regarding your Model Systeme_Vis_ecrou, I guess I have to write 1/pas in the substystem as my input is in [N.m] and my output in [N]. Am I right?
thanks again
Franck Donnadieu
Franck Donnadieu 2020 年 8 月 26 日
Yes you are right and I have already done it in the model "systeme_vis_ecrou_effort.slx".
;)
Cyril  CRIER
Cyril CRIER 2020 年 9 月 15 日
Hello Franck,
I'm using your models (comming back on the topic after Holidays). I observed, by looking under the mask, that you used a Wheel and Axle block to simulate the lead screw system (for speed and for Torque).
Does it mean that the output speed is parallel to the rotational direction of the entrance? I ask because I have at the end a displacement way higher than expected. What I need is actually an output speed in the direction of the axle...
Furthermore, I'm trying to add a spring in parallel of the Torque part of the "Système Vis écrou". I'm not sure to know where I should install it. Do you have an idea?

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