How to get stiffness and damping values for single degree of freedom?

I'm doing mathematical modeling for (SDOF) a car seat which has mass 20 kg. I need stiffness and damping values to solve the equation of motion in Matlab. So please can u tell me any procedure to get these value.

Answer 1

[KSSV]

There is a relation between natural frequency, stiffness and mass.....the relation is :

w = sqrt(k/m) ;

As you want to find what should be k...then you have to decide/ fix frequency w and then get k, as m is known.

YOu can have a look on Rayleigh damping, to fix the take damping value. Rayleigh damping depends on K and M.

[raju patel]

Sir, I understood what u have answer but is there any other software through which I can find these value

[raju patel]

Is there any experimental or simulation way to get the exact values?

[KSSV]

IT is your choice......they mostly fix values..by keeping frequency in hand.....

[raju patel]

Thank you, Sir.

[raju patel]

Sir, can u suggest software for Rayleigh damping?

[KSSV]

Why you need a software dude.....you have MATLAB in hand.....

[raju patel]

Thank you

[KSSV]

Thanks is accepting the answer..:)

[raju patel]

Sir, still i have to doubt regarding Rayleigh damping. How to do in Matlab if u have any example can please share with me.

[KSSV]

C = a*M+b*K ;

You need to fix coefficients a and b.

[raju patel]

On what factors I have to fix the value of a and b. Since some journal has suggested to fix 5percent for zeta value and get the C value.

Answer 2

[M]

Stiffness and Damping values depend on the material of the car seat you're studying.

[raju patel]

I have understood what have u answered but I there any experiment or simulation way to get the exact values?