NDLI: Multi-body model of a bobsleigh: comparison with experimental data

Content Provider	Springer Nature Link
Author	Braghin, Francesco Cheli, Federico Donzelli, Mauro Melzi, Stefa Sabbioni, Edoardo
Copyright Year	2010
Abstract	Bobsleigh is a winter sport in which teams make timed runs down narrow, twisting, banked, iced tracks in gravity-powered sleds. To win the race, it is of great importance to have a sled that is optimized from both the sliding and the aerodynamic point of view. However, also typical vehicle parameters, such as the weight distribution and the inclination of the steering axis, play an important role. In fact, being the friction coefficient between skates and ice very small (approx. 0.04), a change in the weight acting on the front skates may significantly modify the steering feedback of the driver thus highlighting his/her driving ability. Better trajectories imply less correction on the steering axis, and thus better performances. The inclination of the steering axis, instead, generates a torque similar to the self-aligning torque produced by road vehicle tires thus stabilizing the front skates and requiring less control actions to the sled driver.Up to now, bobsleigh design has been carried out mainly on the basis of the feedback of athletes. The drawback of this approach is that it leads to small modifications in the bobsleigh’s design and it does not allow to objectively identify the influence of the applied modifications/innovative solutions on the bobsleigh’s overall performance.To be able to quantify the influence of certain design changes on the performance of bobsleighs, it was decided to set up a multi-body model of a two-man sled. To validate the numerical model, an experimental campaign with an instrumented bobsleigh was carried out at Cesana Pariol Olympic track. During the tests, the bobsleigh was instrumented with two inertial gyroscopic platforms to measure the dynamics of the two frames constituting the bobsleigh body, sixteen strain gauge channels to measure the ice–skates contact forces, one optical sensor to measure the bobsleigh speed, and one potentiometer to measure the steer angle imposed by the driver. Numerical results have shown a good agreement with the experimental data.
Starting Page	185
Ending Page	201
Page Count	17
File Format	PDF
ISSN	13845640
Journal	Multibody System Dynamics
Volume Number	25
Issue Number	2
e-ISSN	1573272X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-08-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bobsleigh Multi-body model Skate–ice unilateral contact model Automotive Engineering Mechanical Engineering Electrical Engineering Optimization Vibration, Dynamical Systems, Control
Content Type	Text
Resource Type	Article
Subject	Control and Optimization Mechanical Engineering Aerospace Engineering Modeling and Simulation Computer Science Applications

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