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Dampers are designed with a specific weight (mass) and diameter, which are dependent on the damping material/method used, to reduce mechanical Q factor, or damp, crankshaft resonances. A harmonic balancer (sometimes called crankshaft damper , torsional damper , or vibration damper ) is the same thing as a harmonic damper except that the ...
The torsional vibration of the crankshaft forces the fluid through narrow passages that dissipates the vibration as heat. The viscous torsional damper is analogous to the hydraulic shock absorber in a car's suspension. Tuned absorber type of "dampers" often referred to as a harmonic dampers or harmonic balancers (even though it technically does ...
Viscous damping also refers to damping devices. Most often they damp motion by providing a force or torque opposing motion proportional to the velocity. This may be affected by fluid flow or motion of magnetic structures. The intended effect is to improve the damping ratio. Shock absorbers in cars; Seismic retrofitting with viscous dampers [2]
Harmonic damper for a 1937 Pontiac engine. Torsional vibration develops when torque impulses are applied to a shaft at a frequency that matches its resonant frequency and the applied torque and the resistive torque act at different points along the shaft. It cannot be balanced, it has to be damped, and while balancing is equally effective at ...
Tuned mass dampers are widely used in production cars, typically on the crankshaft pulley to control torsional vibration and, more rarely, the bending modes of the crankshaft. They are also used on the driveline for gearwhine, and elsewhere for other noises or vibrations on the exhaust, body, suspension or anywhere else.
A less common type of dashpot is an eddy current damper, which uses a large magnet inside a tube constructed of a non-magnetic but conducting material (such as aluminium or copper). Like a common viscous damper, the eddy current damper produces a resistive force proportional to velocity. A common use of the eddy current damper is in balance scales.
This method is very similar to air friction damping, except rather than having air in a chamber, it is replaced with fluid. [3] This method is hindered by the fact that it can only be done vertically, as it requires the liquid to be in an upright position. Eddy current damping is the use of an Eddy current and an electric field to create an ...
[1] [2] Damping is an influence within or upon an oscillatory system that has the effect of reducing or preventing its oscillation. [3] Examples of damping include viscous damping in a fluid (see viscous drag), surface friction, radiation, [1] resistance in electronic oscillators, and absorption and scattering of light in optical oscillators.
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