Help with Dynamic simulation

[Yashasvi23481]

Hi All,

        I am trying to learn dynamic simulation to test movement of an assembly with effect of wind speed, where every part can move and tip over. I want to know if particular assembly will stand or tip over. If at all, it moves what will be displacement. In normal stress analysis, some point has to be fixed but effect of wind will be on all parts. 

              Through my previous posts, I was suggested to use Dynamic analysis, so I am entering into foray for first time. I am presenting you the assembly and need to know how to go about doing analysis. Being first time, will be good if I can get step by step instruction. I searched online but cudnt get similar assembly to aid. Ignore the fasteners/ skip them when prompted.  Force applied is on slant face. I am in dynamic simulation environment and all terms are new to me. joints have replaced constraints. Please help.

Regards,

Yash

[Yashasvi23481]

Hi JD,

   Hope you feeling better. I have solved the top 3 points as explained by you. My assembly is failing only because of 2D contact. I have tried multiple parts and its still coming with error message: impossible to do simulation. I have seen couple of solution in forum you have helped with assembly for few on similar topic. Will be good if you can do same for me. 

              I have brought other assemblies to same position. So once I figure out 2D contact and solve it to get motion right I can move ahead to do FEA import. If you can please look into my assembly and resolve it over weekend, it will take burden off me lil bit. Like you did for others, I will be grateful if you can zip my assembly (solved). 

Regards,

Yash

[Yashasvi23481]

Hi JD,

    Hope you feeling better. Thank you very much for your patience and showing the 2D contact solution. Regarding the constraints in the part drawing sketch, I didn't design it, rather it  was from earlier designer. I am just conducting test. I will implement them on my model. I also learnt about split face over weekend rather than extruding it.  

    1 last and general question, if spring is involved what extra info is required for dynamic solution ? 

Regards,

Yash

[JDMather]

Add spring force.

Need to know the free length of the spring and desired pre-load.

[Yashasvi23481]

Hi JD,

   Quick one. I see in your video, you 2 screens with different magnitude curve. How do I add second screen showing curve as well. I got linear to harmonic. Second thing, you have shown counter weight so if we cant use counter weight, means we have to increase pivot height so it comes down on its own (by making bottom part heavier) ? You have opted for associative force rather than constant force in magnitude. 

             I think I got all contacts and joints in place only gravity and force is playing up. I cant use counter weight so trying alternative options. I have to re design so bottom section has same width as top which add weight. Not very urgent. I am trying to figure out how you got 2 screens with magnitude curve, one harmonic and other linear. 

Regards,

Yash

[JDMather]

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@Yashasvi23481 wrote:

1.  I see in your video, you 2 screens with different magnitude curve.

2.  You have opted for associative force rather than constant force in magnitude. 

3.  I think I got all contacts and joints in place only gravity and force is playing up. 

---

1. What video. What timestamp?

2. What video. What timestamp?  (I suspect it will associative direction rather than magnitude, but not sure what I did back then. You will have to provide me with exact reference.)

3. No new assembly attached?

Any forces that I used were imaginary - pulled out of thin air.  I have no information about your projectile.  You should have this information based on physical testing or at least provide hand calculation results.

[Yashasvi23481]

Hi JD,

   I had replied to a screencast video that you posted in the thread. its message #7 and video length is 7 min 17 sec....when I toggle green button, I get the following screen. Load of 470 is exactly what I have calculated. Will upload video later on, to where I have progressed. 

     after load is released the bottom bit doesn't resonate, it hangs in air. 

Regards,

yash

[Yashasvi23481]

Hi JD,

  Can I send you updated zip file in person. Could you provide me with your email id ?

Regards,

Yash

[P_Korgaonkar]

Hello JD Mather and all members

I need help with attached drive drum assembly.

This is a spiral conveyor.

A 4600 mm diameter sprocket is attached to the bottom outer ring of this drum. It is driven using a transmission chain.

The drum is spinning at 1.6 RPM and 50,000Nm torque is applied.

This drum is supported with top and bottom bearing.

I can't think of how to simulate this condition. So all I have done is applied 25,000Nmtorque on the bottom ring where sprocket is attached and applied 25,000Nm torque on drive bars which drive he belt.

I am not sure if this the correct way to do this, and the result I got are correct or miles out.

Any help is appreciated.

If you have any questions please do not hesitate to ask.

On a another note,

Anyone interested in providing online tutoring to help me is welcome and I am happy to pay for this tutoring.

Or if you know someone who might be interested, please provide them with my contact details.

parag@contechengineering.com

Youtube link showing spiral conveyors

https://www.youtube.com/watch?v=DF9goJI8Hnk

https://www.youtube.com/watch?v=IhwyAyz5YiM

Regards

Parag