friction dampers

shimmy dampers

shimmy dampersclick for a larger image
A shimmy damper consists of an oil filled cylinder, with a push–pull rod attached to a disk inside the cylinder. When the push rod moves from side to side, oil is forced to flow through the holes, which acts a damper.
A small hydraulic or pneumatic shock absorber installed between the nose-wheel fork and landing gear structure to prevent or minimize nose-wheel shimmying during takeoff and landing. It is more typically found on nose-wheels than on tail-wheels. Also known as friction dampers, as they use friction to damp the oscillations.
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They address selection and scaling time history records for performance-based design, seismic assessment and retrofitting of an under-designed reinforced concrete frame through a displacement-based approach, a single-run adaptive pushover procedure for shear wall structures, the influence of the shear-bending interaction on the global capacity of reinforced concrete frames, the structural performance of typical and non-ductile public reinforced concrete buildings strengthened using friction dampers and reinforced concrete walls, dynamic stability and post-critical processes of slender auto-parametric systems, and the accuracy of force and deformation-based methods in determining the seismic capacity of rehabilitated reinforced concrete school buildings.
Jangid, "Seismic analysis of structures connected with friction dampers," Engineering Structures, vol.
Min, "Use of rotational friction dampers to enhance seismic and progressive collapse resisting capacity of structures," Structural Design of Tall and Special Buildings, vol.
Although weight is increased, the vehicle also has increased mobility due to improved torsion bar suspension components and advanced friction dampers. It can drive through 4 metres deep water using snorkel and 1.2 metre without it.
[93] proposed an integrated approach to realize both the vibration control and the damage detection of a transmission tower-line system subjected to seismic excitation by using semiactive friction dampers as shown in Figure 17.
Techniques like safe clear distance between buildings, increasing the stiffness of both building by using shear wall, bracing system and friction dampers are used as effective mitigation techniques to avoid pounding between adjacent building structures during an earthquake.
On the other hand, frictional drag is readily utilized for friction clutches, breaks, welding, and friction dampers.
Friction dampers were first used before the turn of the century.
Cheng, "Piezoelectric friction dampers for earthquake mitigation of buildings: design, fabrication, and characterization," Structural Engineering and Mechanics, vol.
This new aspect has been emphasised in the response of frames equipped with friction dampers [14].
Stokes, "Semi-active control of friction dampers," Journal of Sound and Vibration, vol.
It goes without saying that having read the paragraph above, the friction damper described under "The Damper I" paragraph would not last long.