why is there an overshoot in the volatge amplitude?

[engrbabar]

I have a source free parallel RLC circuit with R=1.923 Ohms, L=1H, C=10mF, v(0)=5V DC and i(0)=0A.
The plot of output voltage versus time is shown for t>0.
Can anybody tell what are the reasons for the initial overshoot in the amplitude?

 

[halls]

I would say it's due to the high inductance. One way to see the reason is to mathematically solve the circuit and analyze it's behavior (not just with matlab).

 

[engrbabar]

I did solve the differential equation and the solution is

v(t) = 10.625exp(-2t) - 5.625exp(-50t)

This is an exponentially decaying function and v(0)=5V. But there is an overshoot upto 9V for small amount of time.For t>0 both inductor and capacitor are going to deliver the stored energy to the resistor so v(t) should decay rather than increase.

So WHY IS THERE THIS OVERSHOOT of 4V?

 

[angelote]

The overshoot depends on your circuit's quality and damping factors. It seems that your circuit underdumped.
To get a better idea on what is happenning, you could plot the current across the inductor.