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Excessive vibration of the front wheels of a wheeled vehicle causing a jerking motion of the steering wheel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Thirty individual amateur groups, all under the close direction of professional choreographers, hip-hopped, skated, shimmied, grooved and twisted their way through the central artery of Lyons while celebrating the theme of the Biennale's ninth edition, "The Silk Routes." In addition to giving the region's dancers an opportunity to dance through the city, the parade also unites people from the otherwise neglected and impoverished outlying immigrant suburbs in a festive international celebration.
BELLY dancers shimmied and shook in sequins and spangles as part of an open day for adult learners at a Nuneaton college.
The camp Strictly Come Dancing judge encouraged the Duchess of Cornwall to wiggle her hips as they held hands and shimmied to a Latin track, yesterday.
Wearing a peach, Grecian-style off-the-shoulder dress, the actress put her poor other half in the shade as she shimmied down the red carpet for the premiere of El Cantante in Times Square.
This little fact emerged at the premiere of Enigma last week when gorgeous actress Saffron Burrows shimmied across the screen wearing stocking tops.
Fashion Week shimmied its way into the Grand Opera House with all the fizz expected for the annual bow to the gods of the shops.
Things went swimmingly well for the large Aquarian in the Molinaire Studios as he shimmied with the twins from Transylvania.
Tina Landon and Travis Payne shimmied away with best music videos, Livin' La Vida Loca for Ricky Martin and You Can't Rock Me for Brian Setzer, respectively.
And his second was even better as he shimmied in from the left flank to curl in a magnificent 30-yard shot.
SEXY Samantha Mumba put the stars of Spider-Man 2 in the shade when she shimmied up to the premiere in a web dress dripping in diamonds to the tune of pounds 5million.
BEYONCE shimmied and shined the brightest of all the stars who turned out for Hollywood's world premiere of the new Austin Powers film.
All eyes were on the supermodel mum-of-two, who was recently treated for exhaustion and depression at the Meadows Clinic in Phoenix, Arizona, as she shimmied into the exclusive diamond store in London's Bond Street on Wednesday night.