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Company Press Releases

Mar-17 Mechanical Simulation Releases SuspensionSim 2017
Dec-16 Mechanical Simulation Releases CarSim, TruckSim, and BikeSim 2017.0
Dec-16 Mechanical Simulation Upgrades NIOSH's QuadDS Driving Simulator
Feb-16 Mechanical Simulation Releases CarSim 2016
Dec-15 Mechanical Simulation Releases CarSim, TruckSim, and BikeSim 2016
Oct-15 Mechanical Simulation Delivers Engineering Driving Simulator to Canadian Tire
May-15 Mechanical Simulation Releases SuspensionSim 9.0
May-15 Mechanical Simulation Releases BikeSim 9.0
Apr-15 Mechanical Simulation Corporation Joins University of Michigan's MTC Affiliates Program
Feb-15 Mechanical Simulation Releases TruckSim 9.0
Nov-14 Meritor and Meritor-WABCO Purchase QuadDS Driving Simulator from Mechanical Simulation Corporation
Oct-14 Mechanical Simulation Releases CarSim 9.0
Mar-14 Terence J. Rhoades, President of Mechanical Simulation Corporation, Honored with SAE International Medal of Honor
Feb-14 Mechanical Simulation Releases SuspensionSim 8.2
Dec-13 Mechanical Simulation Delivers Human-Hardware-in-the-Loop Driving Simulator to Geely Automobile
Aug-13 Mechanical Simulation Releases TruckSim 8.2
Jul-13 National Transportation Safety Board Takes Delivery of a 3 DOF Driving Simulator from Mechanical Simulation Corporation
Mar-13 Mechanical Simulation Announces New Representation Agreement in India with Xitadel
Feb-13 Mechanical Simulation Purchases SuspensionSim
Jan-13 BikeSim 3.2 is Released
Jan-13 CarSim 8.2 is Released
Dec-12 BikeSim Identifies Vibration Modes in Racing Motorcycles
Dec-12 RPUG Award Presented to Mike Sayers
Nov-12 Mechanical Simulation Earns 2012 Award for Exceptional Engineering Support
Apr-12 Partnership with Altair Engineering
Jan-12 TruckSim 8.1 Released

Archived press releases

BikeSim is Used to Identify Vibration Modes in Racing Motorcycles

ANN ARBOR, Mich., December 12, 2012. In testing a new version of Mechanical Simulation's BikeSim software for simulating the dynamic behavior of motorcycles and scooters, Dr. Yukio Watanabe (the chief developer of BikeSim) identified a feature of motorcycles that had been observed but not understood by MotoGP race teams.

One of the major new features in the coming release of BikeSim 3.2 is the capability to "linearize" the vehicle math model to support classical analysis methods often used with simpler models. A common application for this feature is to identify vibration modes of the vehicle that can cause stability and safety problems.

In testing the new feature, Dr. Yukio Watanabe confirmed that BikeSim correctly captured some well-known vibration modes called "weave" and "wobble." However, he also found a vibration mode that has not been described in the technical literature. In collaboration with Professor Robin Sharp - the well-known motorcycle researcher who first defined the weave and wobble vibration modes in the 1970s (and supervised Dr.
Watanabe's Ph.D. in the 1990s) - Dr. Watanabe investigated the BikeSim predictions and identified a vibration mode called "chatter" that affects MotoGP racing teams when operating at high-speed and high cornering loads (more than 50 degrees of lean, with lateral acceleration of about 1 G). Chatter is due to the combined vibrations of motions in steer axis rotation, fork/chassis twisting rotation and longitudinal fork bending.

Further research with the new BikeSim linear analysis showed that all motorcycles have the potential for chatter vibration as well as weave and wobble motions. However, the chatter is usually stable and doesn't resonate under normal riding conditions; it mainly appears under race conditions when the chassis structure is not stiff enough.

The chatter analysis was submitted as a technical paper by Sharp and Watanabe and published through Vehicle System Dynamics in October 2012:

R. S. Sharp & Y. Watanabe (2012): Chatter vibrations of high-performance motorcycles, Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility, DOI:10.1080/00423114.2012.727440

About Mechanical Simulation Corporation: Mechanical Simulation Corporation is a technology leader in the development and distribution of advanced software used to simulate vehicle performance under a wide variety of conditions. The company was established in 1996, and from its Ann Arbor, Mich., headquarters provides car, truck and motorcycle simulation packages, training and ongoing support to more than 90 OEMs and Tier 1 suppliers, and over 160 universities and government research groups worldwide. For more information, visit www.carsim.com.


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