Study on Shimmy Vibrations of Wheeled Casters

Ioi, Kiyoshi; Mu, Yu; Nishikawa, Seiki; Suda, Akira; Tagami, Masaharu

doi:10.7763/ijmmm.2015.v3.173

Cited by 2 publications

(3 citation statements)

References 2 publications

(1 reference statement)

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“…Figure 1-8: Tire Marks from Shimmy Flight Testing [1] There have also been multiple attempts to build similar devices to the drums from Von Schlippe, Dietrich, and Pacejka [18,19,20]. Takács and Stépán used a stiffened conveyor belt and elastic tire for many of their experiments as shown in Figure 1-9 [18].…”

Section: Existing Shimmy Testingmentioning

confidence: 99%

“…The required power of the motor was determined using equation 20: 𝑃 = (20) where P is the horsepower required for the component, ⍵ is the rotational speed of the component in rpm, and T is the torque required to drive the component in ft-lbs. Torque is calculated using equation 21 below: 𝑇 = 𝐼 (21) where t is the time required to spin up the component, assumed to be 60 seconds, and Ɪ is the moment of inertia of the component in lbf ft s 2 .…”

Section: Ac Motor and V-beltmentioning

confidence: 99%

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Artificial Runway Design for Shimmy Testing on Nose Landing Gear

Kim

2023

Preprint

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<p>This report proposes a novel design for general experimentation of shimmy on the nose landing gear of aircraft. Shimmy is known to cause excessive wear on the landing gear, discomfort to occupants, and potential safety hazards. A wide body of research exists for analytical models and computer simulations of shimmy. However, these models require physical testing to challenge underlying assumptions, particularly with regards to tire dynamics. Current experimentation methods, such as flight testing or small-scale setups, are either prohibitively expensive or inaccurate. The proposed design creates an artificial runway that would simulate real world conditions for aircraft, including accurate take-off speeds, weights, and ground interactions. This creates an environment for directly measuring shimmy, as well as other related quantities such as tire slip angle and deformation. This allows for a wide range of experiments to be conducted for model and design verification.</p>

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Section: Existing Shimmy Testingmentioning

confidence: 99%

Section: Ac Motor and V-beltmentioning

confidence: 99%

Artificial Runway Design for Shimmy Testing on Nose Landing Gear

Kim

2023

Preprint

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“…Furthermore, the rails and wheels are ideal, so any occurring vibrations fall into the category of self-excited. Even though the present problem is of different nature, an analogy can be established with the well-known shimmy phenomenon [5][6][7][8][9][9][10][11][12][13][14][15] or the rocking motion of trailers [16,17].…”

Section: Introductionmentioning

confidence: 99%

A first analysis of possible elementary causes of self‐excited vibrations in roller coaster rides

Agustí

Kecskeméthy

2023

Proc Appl Math and Mech

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The emergence of vibrations during a roller coaster ride is a recurring phenomenon that can deteriorate the overall experience and accelerate material fatigue. Nevertheless, the causes of such vibrations are still not completely understood and are consequently not fully predictable during the design process. One possible source lies on the irregularities of the rails, acting as a forced external excitation. However, a spectral analysis shows deviations with respect to real measurements [1], as the frequencies are not synchronous with the car velocity divided by the spatial irregularity period. Therefore, there is an indication that the vibrations may be due to self‐excitation and/or that the developed models should consider other phenomena not yet contemplated. This investigation analyses –for the first time to the knowledge of the authors– the plausibility of various causes of self‐excited vibrations during a roller coaster car motion. Given the complex structure of a real roller coaster train and the intricate geometry of the track, the study considers as a first step minimal dynamical models running along a straight track. The cause analyzed in this paper is the contribution of the transversal friction force component that develops in the wheel‐rail contact interface to the destabilization of the longitudinal motion, as well as the effect of the various geometrical and inertial parameters. In this first analysis, no external excitation is considered. For a range of parameters, the minimal system presents a Hopf bifurcation. The results are plausible from the general behavior and thus this cause may be retained as a candidate for the real vibrations occurring in roller coasters. However, the applicability of these preliminary results to general roller coaster motions is not yet confirmed, but a superposition with other causalities may render effective. In further investigations, a complete train motion on curved tracks and external perturbations will be studied to determine the share of the different causes.

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Study on Shimmy Vibrations of Wheeled Casters

Cited by 2 publications

References 2 publications

Artificial Runway Design for Shimmy Testing on Nose Landing Gear

Artificial Runway Design for Shimmy Testing on Nose Landing Gear

A first analysis of possible elementary causes of self‐excited vibrations in roller coaster rides

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