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Coz within the less time,pointer of an analog device gets stablilized and

at one point and gives us the required measuring value instantly---this happens in case of critical damping.

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Q: Why is critical damping faster than overdamping?
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What is over damping?

Overdamping occurs when the system achieves the desired result without overshooting, but takes longer than necessary to do so, as the critical elements require a slower response time.


Advantage of critical damping over under damping and over damping?

A system that is critically damped will return to zero more quickly than an overdamped or underdamped system. Underdamping will result in oscillations for an extended period of time, and while overdamped things will return to zero without much (or any, I think) oscillations they will get there more slowly.


What is deflecting?

Controlling torque controls the deflection and tries to stop the pointer at its final position.But due to inertia, the pointer oscillates around its final position before coming to rest. Hence damping torque is provoded to avoid this oscillation and bring the pointer quickly to its final position.Thus the damping torque is never greater than the controlling torque. In fact it is the condition of critical damping which is sufficient to enable the pointer to rise quickly to its deflected position without overshooting.


What is deflecting torque?

Controlling torque controls the deflection and tries to stop the pointer at its final position.But due to inertia, the pointer oscillates around its final position before coming to rest. Hence damping torque is provoded to avoid this oscillation and bring the pointer quickly to its final position.Thus the damping torque is never greater than the controlling torque. In fact it is the condition of critical damping which is sufficient to enable the pointer to rise quickly to its deflected position without overshooting.


Calculation of damping ratio for car suspension?

Yes, but it involves a second order differential equation. Using the mass, spring constant and damping constant any physical object or assembly's damping ratio can be calculated. In the design of the vehicle the damping ratio was determined by the engineers at the automaker depending on the type of car. A sports car would have a higher damping ratio (maybe 0.7 or so) than a cushy luxury car. Over time the damping ratio will change as the components age. The most obvious is the bouncy feeling when you don't replace your struts or shocks as intended. That's when your tight sports car's suspension starts to behave like a 70's Buick. You just lowered your damping ratio without knowing it.


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Because, air is good thermal resistance, damping with water filled up the air void and heat can transfer much better in water than air.


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