Theory of Damping: General Equation?

In summary, there is a general equation for damping in the form of ##\ddot x + 2\beta\omega\dot x + \omega^2 x = f## where ##\beta## and ##\omega## represent different damping scenarios. This equation applies to both RLC circuits and mechanical spring-mass-dashpot models. For further analysis of multi degree of freedom systems, one can use normal modes and search for solutions using Google.
  • #1
Gackhammer
13
0
Is there a general equation of damping? I know that there is a second ODE for damping with regards to springs, and with RLC circuits, but is there a general form of damping equations (with critical-damp, overdamp, and under-damp). I know how to solve second ODEs, but I was wondering if there was a general equation, because all I could find are equations that relate specifically to springs or RLC Circuits
 
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  • #2
Try google for multi degree of freedom (MDOF) systems analysed using normal modes.

A general equation in that form is ##\ddot x + 2\beta\omega\dot x + \omega^2 x = f## where ##\beta## is < 1, = 1 or > 1 for under damping, critical, or over damping and ##\omega## is the undamped oscillation frequency.
 
  • #3
it's the same as with RLC or the mechanical spring, mass, and dashpot models.

just a simple 2nd order differential eq.
 

1. What is the general equation for the Theory of Damping?

The general equation for the Theory of Damping is: x(t) = A*e^(-ζωn*t)*cos(ωd*t+φ), where x(t) is the displacement at time t, A is the amplitude of the oscillation, ζ is the damping ratio, ωn is the undamped natural frequency, ωd is the damped natural frequency, and φ is the phase angle.

2. How is damping defined in the Theory of Damping?

Damping is a measure of the energy dissipation in a vibrating system. It is a parameter that describes how quickly the oscillations in the system decay over time.

3. What is the significance of the damping ratio in the Theory of Damping?

The damping ratio, ζ, determines the type of damping in a system. A system with a ζ value of less than 1 is considered underdamped, a ζ value of 1 indicates critical damping, and a ζ value greater than 1 is considered overdamped.

4. How does the undamped natural frequency affect the behavior of a system in the Theory of Damping?

The undamped natural frequency, ωn, is a measure of how quickly a system would oscillate if there were no damping present. A higher ωn value means the system will oscillate at a faster rate, while a lower ωn value means slower oscillations.

5. Can the Theory of Damping be applied to all types of systems?

Yes, the general equation for the Theory of Damping can be applied to a wide range of systems, including mechanical, electrical, and structural systems. However, the specific values for parameters such as the damping ratio and undamped natural frequency may vary depending on the type of system being analyzed.

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