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Excessive vibration of the front wheels of a wheeled vehicle causing a jerking motion of the steering wheel.



(1) In motor vehicles, an intense vibrational process that occurs in a vehicle’s steered wheels and front suspension. Steered wheels that are connected to a motor vehicle’s frame or body by an elastic suspension and a steering linkage are components of a complex vibrating system. Such wheels vibrate when a vehicle travels on a bumpy road, when the vehicle’s wheels are improperly aligned, or when the vehicle’s suspension and steering gear are kinematically mismatched.

Shimmy impairs road safety, increases the rolling resistance at the tires, and intensifies the wear of the parts of the steering gear and suspension. It also increases tire wear.

To reduce the harmful effects of shimmy, independent front suspension is widely used in present-day passenger cars. In other motor vehicles, the kinematic design of the steering gear and suspension may be improved by moving the centers of wheel vibration closer to the drag links and the hinge points of the springs. Other measures to reduce the effects of shimmy include dynamic wheel balancing and stabilization of the direction in which the wheels move when they encounter road irregularities.

(2) In airplanes, a free vibration of the nose wheel of a tricycle landing gear that occurs during taxiing, takeoff runs, and landing runs. The free vibration is manifested as a yawing of the nose wheel. It may result in the collapse of the shock strut or in an airplane crash.

Shimmy is eliminated by means of shimmy dampers. They prevent the occurrence of free vibration but do not prevent the nose wheel from being steered.

References in periodicals archive ?
I think Shimmy must have been abandoned as she is very friendly, and has obviously been loved at some point," said Rachael.
The heads that I use for the Swimmin' Shimmy are actually pretty easy to shape if you can get four clean cuts using two single-edge razor blades.
Whereas a vanner in the 1930s might have landed the van upside down in a ditch and sat trapped while battery acid dripped down onto her tattered uniform (as did Miss Hasell), the hairiest it got for Lauren was a slightly worrying shimmy she felt when the van was going downhill.
It took her six months to learn how to shimmy, a fast, vigorous movement of the hips.
England did manage a first- half try from Greening after a splendid shimmy from Cohen which Sir Stanley Matthews would have been proud to have called his own.
Some of the cast were in the capital last week during their UK-wide promotional tour and I had the privilege of joining James Bennett and Lisa Welham and choreographer Glenn Wilkinson for a shimmy at the dance studios at the Commonwealth Pool.
The hologram performed the track Shame on a N***a from the band's Enter the Wu-Tang (36 Chambers) as well as his track Shimmy Shimmy Ya.
King's lawyers told a Glasgow City Council licensing board hearing Ciaran Keenan was not an employee at his controversial Shimmy Club.
It proves that a great story will get out, regardless of who it's about," said Shimmy Marcus, director of new Irish film 'Good Cake Bad Cake - The Story of Lir' which tells the the heartbreaking plight of the Dublin band.
Art in the Dancehall, which has opened at The Drum, in Aston, curated by Shimmy Shimmy and Al Fingers, and in association with the Puma Yard and Jamaica50, aims to redress the balance, celebrating dancehall illustration and design from 1980 to the present day.
30pm from Abercrombie Street, and will see 500 dancers shimmy across the city.
Washington, Nov 13 (ANI): Seeing a dog shake and shimmy after a bath is a common sight - and now scientists at the Georgia Institute of Technology have figured how fast a sopping wet pooch must shimmy to dry himself off.