Dynamics-Critical Damping Coefficient

In summary, the critical damping coefficient for a damped single degree of freedom system is defined as 2 x m x (omega), where m is the mass of the system and omega is the natural frequency. This expression is obtained through experiments or statistics. If the critical damping coefficient is obtained, the system will not oscillate and the oscillation frequency will be zero. The general expression for the oscillation frequency is omegad = omegan x sqrt (1-(b^2/2 x m x (omegan)^2)), and to keep the oscillation frequency at zero, the critical damping coefficient should be 2 x m x (omegan).
  • #1
jrm2002
57
0
I have been reading Equations of Motion pertaining to "Damped Single Degree of Freedom Systems"

There, the critical damping coefficient wherein the oscillation is completely eliminated from the system is defined by:

Critical Damping Coefficient = 2 x m x (omega)

where,
m=mass
omega=natural frequency of the system
Natural frequency of the system= square root(k/m)

k=stiffness of the system

I want to know how the expression for critical damping coefficient obtained as 2 x m x (omega).

Is it obtained through experiments/statistics??

Please help
 
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  • #2
Remember how a spring acts if the "critical damping coefficient" is obtained.
How is the spring moving then?
 
  • #3
Thanks for the response!
The spring will not oscillate if the critical damping coefficient is obtained.
My question is how the expession of

Critical Damping Coefficient = 2 x m x (omega) is obtained??
Is it through experiments or statistics??

where,
m=mass
omega=natural frequency of the system
Natural frequency of the system= square root(k/m)

k=stiffness of the system
 
  • #4
"The spring will not oscillate if the critical damping coefficient is obtained.
"

Correct!
So, if the system doesn't oscillate, what is its oscillation frequency equal to?
 
  • #5
if the system does not oscillate , oscillation frequence is zero
 
  • #6
Again correct!

1. Now, for a given damping coefficient b, what is the general expression for the oscillation frequency of the system?

2. How should we choose critical damping coefficient b* so that the oscillation frequency is, indeed, 0?
 
  • #7
1)for a given damping coefficient b, what is the general expression for the oscillation frequency of the system,

omegad = omegan x sqrt (1-(b^2/2 x m x (omegan)^2))
2)to keep the oscilaltion "zero"
b=2 x m x (omegan)
 
  • #8
Again correct. You're finished.
 

1. What is the Dynamics-Critical Damping Coefficient?

The Dynamics-Critical Damping Coefficient is a measure of the damping in a system that is necessary to bring the system to a critically damped state. It is a value that is used in the field of dynamics to analyze the behavior of systems, particularly in the study of mechanical and electrical systems.

2. How is the Dynamics-Critical Damping Coefficient calculated?

The Dynamics-Critical Damping Coefficient is calculated by taking the square root of the product of the mass of the system, the spring constant, and the natural frequency of the system. It can also be calculated using other parameters, depending on the specific system being analyzed.

3. What is the significance of the Dynamics-Critical Damping Coefficient?

The Dynamics-Critical Damping Coefficient is a critical parameter in understanding the behavior of a system. If the damping coefficient is too low, the system will become underdamped, leading to oscillations and potential instability. If it is too high, the system will become overdamped, resulting in slow response times. The critical damping coefficient ensures that the system reaches a stable equilibrium in the most efficient manner.

4. How does the Dynamics-Critical Damping Coefficient affect the response of a system?

The Dynamics-Critical Damping Coefficient directly affects the response of a system by determining the speed at which it reaches equilibrium. A higher damping coefficient leads to a faster response time, while a lower damping coefficient results in a slower response time. Additionally, the damping coefficient can also affect the amplitude of the response, with higher values resulting in smaller oscillations.

5. How is the Dynamics-Critical Damping Coefficient applied in real-world scenarios?

The Dynamics-Critical Damping Coefficient is applied in a variety of real-world scenarios, such as in the design of mechanical and electrical systems, in the analysis of earthquake-resistant structures, and in the development of advanced control systems. It is a critical parameter in ensuring the stability and efficiency of systems in various industries, including aerospace, automotive, and civil engineering.

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