Bearing Analysis

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Hi @Sp108  If I understood correctly,  beyond 4th step the curve is a straight line, is that correct?

Is it possible to share the model file?

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I did this analysis in Radioss,

1. Mesh the model with good quality elements

2. Create material

3. Create solid prop (P_14solid)

4. Assign it to individual components

5. Create contact surface

6. Create contact (TYPE 24)

7. Define curves (one for angular rotation and one for radial load)

8. Define boundary conditions( OR fix, Inner ring rotating, use RBody for the same and assign radial load curve and angular rotation to master node).

if you face any issue in above points revert with the same.

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1 minute ago, Ganesh Munge said:

I did this analysis in Radioss,

1. Mesh the model with good quality elements

2. Create material

3. Create solid prop (P_14solid)

4. Assign it to individual components

5. Create contact surface

6. Create contact (TYPE 24)

7. Define curves (one for angular rotation and one for radial load)

8. Define boundary conditions( OR fix, Inner ring rotating, use RBody for the same and assign radial load curve and angular rotation to master node).

Agree,

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On 5/20/2018 at 10:31 PM, Sp108 said:

Hey!

I made use of the method you mentioned here but I am still not able to simulate an impact scenario here and generate a acceleration-time response curve. I get an output but the force applied increases and becomes constant instead of being an impulse. Any tutorial about the same that I can refer to?

I wish to perform the following:

1. Impact simulation on the outer race on 4 nodes:

Step                                        Load, (N)             Time step, (s)
1 (Bearing Entry)               31.5 T1
3.4975 9 10-3
2 (Bearing in motion)       21.5 T2                 9.4925 9 10-3
3 (Bearing exit)                   34.5 T3                 1.049 9 10-2
4 (Bearing on race)           31.5 T4                 1.399 9 10-2

I wish to use the above values to simulate the impact analysis on 4 nodes in straight line on the outer race.

2. Generate acceleration response curve using Hypergraph

I have attached the time response curve (image: 12) and the simulation file. Please let me know what I should rectify in the model to achieve the response curve similar to image:13.
Regards

Hey Prakash

Can you advice me on how I can rectify this?

Also, I did the entire simulation again and had a few doubts. Please assist me in clarifying the same:

1. For applying a velocity can RFORCE card be utilized?
2. For using RBE3 connectors, which DOFs are needed to e constrained in the given case? You had sent a model where the RBE3 connectors are used to connect the inner nodes of the inner race to the center. Should only the inner nodes be selected or all the nodes? Will it make any difference?

Bearing mesh 020518 NLQS Model.hm

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HI,

The acceleration values are scaled. Please check the units.

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Hi @Sp108,

Are you triggering the 4 loads with in 0.015 seconds and your inner race takes 5 sec to attain 1200 rm.

By the time you have triggered all loads you race is only at 6 rpm.

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So i have to adjust my trigger time for the velocity as well?

So to simulate rotation, should I input velocity value 125rpm at T=0 till T=0.015?

Is the velocity stepped or gradual?

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HI,

You have to make an assumption that it already attained a velocity and provide the velocity throughout.

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Hi @Sp108,

You need to decide when to apply the shock load.

I.e  If you need to apply after attaining reaching full speed you must  either  shift the loading time or time taken to reach 1200 rpm.

As Prakash suggested it will help reducing the simulation time time

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