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Critical damping viewed as the minimum value of damping that prevents oscillation is a desirable solution to many vibration problems. Increased damping implies more energy dissipation, and more phase lag in the response of a system. Reduced damping means more oscillation, which is often undesirable.
7 Ιουν 2024 · Damping refers to reducing or dissipating the energy of oscillations or vibrations in a system. The energy is dissipated usually in the form of heat, which leads to a gradual reduction in the motion of the oscillating system. Examples of damping include: Shock absorbers in vehicles. Seismic dampers in buildings. Vibration dampers on bridges.
This review summarizes the basic principles of vibration control and analyses the vibration control strategies for different damping materials and damping structures. Meanwhile, various models of bio-damped structures are outlined.
The damping may be quite small, but eventually the mass comes to rest. If the damping constant is b = 4mk− −−−√, the system is said to be critically damped, as in curve (b). An example of a critically damped system is the shock absorbers in a car. It is advantageous to have the oscillations decay as fast as possible.
11 Οκτ 2024 · Damping, restraining of vibratory motion, such as mechanical oscillations, noise, and alternating electric currents, by dissipation of energy. A system may be so damped that it cannot vibrate. Critical damping just prevents vibration or just allows the object to return to rest in the shortest time.
Eq.(4) is the desired equation of motion for harmonic motion with air drag. It models what is known as damped harmonic oscillations, and is more realistic than the case where b is assumed to be zero. It can thus be readily applied to most every-day oscillating systems provided they can be defined one-dimensionally.
Damping is a frictional force, so it generates heat and dissipates energy. When the damping constant b is small we would expect the system to still oscillate, but with decreasing amplitude as its energy is converted to heat.
