Real Time Simulation of a Force impact on Blade

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  • Last Post 31 May 2020
Mohammedlamine posted this 30 May 2020

Dear.

As it is my graduation project, the 1st using ANSYS.

I constructed the attached blade, since I am looking to run some tests on it.

My Goal is to measure deformation and displacement and in further stages vibration generated by this Blade due to force f ( axial, transversal).

The force will be applied to the tip of the Blade, The Force f(x,t) = f0*cos(omega*t)*δ(x-x0)  where omega=2*pi*316 (a random value) and δ(x-x0) is the delta of dirac modeling the location of the force (at x0) wherex0=l where l is the length of the blade.

As a result I would like to plot deflection by time.

My approach is to use ''Static - structural " define the fixed geometry (the roots of the blades) and apply the force on the point desired.

- is my approach correct or not? I ask because I am beginner.

- How to input this form of force? I tried function but it only give a Box where I can't input value? do I have to compile it in an other software like MATLAB and import results or there is a solution to do it in ANSYS.

I am also open for any suggestion that serve for solving this Problem and since I am beginner I welcome any idea.

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peteroznewman posted this 31 May 2020

Keep this discussion, but delete the one below since it seems to be a duplicate.

https://studentcommunity.ansys.com/thread/simulation-of-blade-reaction-due-to-force-excitation

 

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Mohammedlamine posted this 31 May 2020

Please advice on my problem questions? please.

I deleted the Post

peteroznewman posted this 31 May 2020

In Workbench (WB), drag out a Modal Analysis. Right click on Geometry and Edit in DesignModeler (DM). In DM, File > Import External Geometry File. Create a Plane that goes through the blade at some distance x from the tip. Use that plane to Slice the body into two bodies.  In the Outline, select the two bodies, right mouse click and Form New Part. That has made a multibody part. Now you have a face between the tip of the blade and the plane to apply a force. This takes care of the Dirac delta function. Force on one face, no force on the adjacent face. Later you can create a Parameter to move that plane up and down along the length of the blade. Close DM.

In WB, drag out a Harmonic Response and drop it on the Solution cell of the Modal analysis. Double click on Model cell of the Modal analysis. In Mechanical, under the Modal section of the outline, select the faces at the root of the blade and assign them as Fixed Support.  Solve the Modal analysis. Look at the range of frequencies. Create some Deformation plots to look at the mode shapes. Animate them.

In Mechanical, under the Harmonic Response section of the outline, select the face at the tip of the blade and assign a Force. The value you type is f0.  The analysis will automatically apply this as a harmonic load with a sinusoidal variation.

Under Analysis Settings set the frequency range minimum and maximum values and the number of Solution Intervals. Under the Damping Controls section, set the Damping Ratio. Under the Solution branch of Harmonic Response, insert a Frequency Response and select a vertex at the tip of the blade and assign a direction that is in line with the maximum bending mode.

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peteroznewman posted this 31 May 2020

 I forgot to mention that you must go into Engineering Data, and add the material of the blade. Minimum properties are Density and Isotopic Linear Elasticity, which needs just the Young's Modulus and Poisson's Ratio. Then in Mechanical, under Geometry, pick the two solid bodies and assign that material.

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Mohammedlamine posted this 31 May 2020

So my first approach using static structural is not a fit to this example.

What if I want just to apply it on one point not a plane just one point like in the example below. a transversal force on a point to the tip of the Blade?

peteroznewman posted this 31 May 2020

If you make a plane at that height and slice the body you will have a horizontal edge you could apply. That should be good enough.

If you make a vertical plane through this point to slice the body into 4 pieces, now you will have a vertex at that point.

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Mohammedlamine posted this 31 May 2020

Thank you so much,I will keep it open I will just follow your guidelines, I will mark it as solved at a later stage to avoid repetition and all since I think I will need more help at some steps

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