applications
Mahindra motorcycle virtual test – simulation of bump rig test using an ADAMS Multibody Dynamics model
SIMULATION CAN ALSO BE USED TO UNDERSTAND COMPLEX PHENOMENA
Bike Sim is used to provide accurate
forecasts for motorcycle dynamic behaviour. Te latest edition, offered as a stand-alone product or through Altair’s Partner Alliance, also includes upgraded features such as a comprehensive powertrain model, a more detailed riding position and refined tyre characteristics to improve the accuracy of simulation results. Watanabe commented: ‘Tese new
repeat the test accurately with a satisfactory precision. An example of this is the research carried
out by Yukio Watanabe, senior development and consulting engineer at Mechanical Simulation, and Robin Sharp, visiting professor at the university of Surrey, a motorcycle researcher who first defined the vibration modes that have been attributed to weave and wobble in the 1970s. Te two researchers used a simulation tool
called BikeSim – of which Dr Watanabe is the chief developer – to predict and identify a vibration mode called ‘chatter’. Tis affects MotoGP racing teams when operating at high- speed and with high cornering loads – defined as more than 50 degrees of lean, with lateral acceleration of about 1G. Chatter was found through studying the combined vibrations of motions in steer axis rotation, fork/chassis twisting rotation and longitudinal fork bending.
www.scientific-computing.com l
features will further assist design engineers by providing an accurate and repeatable alternative to track testing in motorcycle design.’ A paper published by the two
researchers in 2012: ‘R S Sharp & Y
Watanabe (2013) Chatter vibrations of high-performance motorcycles, Vehicle System Dynamics, 51:3, 393-404, DOI: 10.1080/00423114.2012.727440’ explains that the term ‘chatter’ was used by Cossalter et al in a previous study, but some uncertainty remains about its meaning.
High speeds, high pressure While chatter had previously been used to describe a vibration in the front wheel under hard braking, this did not accurately describe a different phenomenon that was caused during cornering at high speeds, normally only found by MotoGP teams under race conditions. Te researchers created a model describing
a Suzuki GSX-R1000 motorbike, and then tested this under various conditions using BikeSim. While the motorcycle model makes up the core of the soſtware, the suite also includes a database of machine, tyre and rider parameters, a graphical user interface, road surfaces and profiles, a plotter and an animator.➤
Mahindra motorcycle model driving on virtual road test – rough road riding test using ADAMS @scwmagazine FEBRUARY/MARCH 2016 35
MSC software
MSC software
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