How do I model a spring in Ansys 2D for a linear generator?

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To model a spring in Ansys 2D for a linear generator, first define the input force affecting the rotor and establish the relationship between mass, acceleration, velocity, and position using transfer functions. The spring coefficient can be integrated into the model, and the damping ratio should be set to zero initially, as there is no friction or power loss considered. To accurately determine the damping coefficient, introduce factors for friction and power loss into the model. The spring's stiffness of 750 pounds per inch can be incorporated into the Ansys model to reflect its effects. This approach will help in analyzing the system's dynamics effectively.
Jayaram12391
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Hi friends,

I am working on a model of linear generator. I have modeled the linear generator in Ansys 2D. Now I want to attach a spring to one end of the rotor and see how it works with the spring attached to it. How do I model the spring?

Also is there any proper way to determine the damping co-efficient of the system

Any help or suggestions will be highly appreciated. Thanks
 
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Jayaram12391 said:
How do I model the spring?
First of all you have to determine what the input/output is to be in the model. Say that the input is some force, F, that affects the rotor, and that x is the position of the rotor, you will get a model like this:
upload_2015-11-19_3-16-17.png
m = mass of rotor
a(s) = acceleration
v(s) = velocity
x(s) = position
K = spring coefficient

Using Masons rule, you will get a transfer function: x(s)/F(s) = 1 / ( m*s2 + K ) = ( 1/m) / ( s2 + K/m ).

which can be rewritten

x(s)/F(s) = ( 1/m ) / ( s2 + 2ζωns + ωn2 )

Here the damping ratio, ζ = 0 , because the coefficient to s = 0. So in this model no damping takes places, but that's because there is no friction and no power loss due to the generator included in this model.
Jayaram12391 said:
is there any proper way to determine the damping co-efficient of the system
So to calculate a realistic damping coefficient, ζ > 0, you must introduce friction/power loss in the model.
 
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Thank you very much for your answer. I know the stiffness of the spring to be attached to be 750pounds/inch. But i am not sure how I can introduce it into the ansys model.

Thanks for your explanation on damping co-efficient. I know the efficiency of the generator. I will try to calculate the damping co-efficient of the system.
 
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