TECHNICAL ARTICLES AND CASE STUDIES

  • BOUTIQUE BIKE CASE STUDY

  • ENGINEERING THE ACE CASE STUDY

  • UNDERSTANDING RIDE COMFORT

    We helped Bike Magazine understand how semi-active damping affected ride comfort.  To analyse ride comfort we decided to measure something called "jerk"

     

    Jerk is the name given to the rate of change of acceleration, or how quickly you accelerate.  The human body is sensitive to the rate of change of acceleration.  If the human body transitions from a stationary position to a state of acceleration in a short time period we feel this as a more discomforting action, compared to a slower change of acceleration rate.  We literally do not like being aggressively pushed around.  The human head is particularly sensitive to this, and if the head is being thrown around due to poor ride control from the suspension, we feel this as poor ride comfort.

     

    To measure jerk we need to first measure accelerations, and then apply some maths to derive the rate of change of acceleration.  We placed accelerometers at various points on the motorcycle chassis, and recorded their response to various road inputs.

     

    We rode two bikes over calibrated road surfaces at the same speeds, to ensure that the road inputs were the same for both bikes.  We recorded the data from these tests.  We modified the acceleration data through a maths channel to derive jerk.  This data then allowed us to compare the ride comfort for the two bikes.

     

    To find out the results click on the magazine article below.

    Aprilia Capanord fitted with sensors and data-logging equipment.  All of the sensors were fitted at GTME's workshop.  Any special brackets required to mount the sensors were either 3D printed or fabricated in-house.  All the sensors were calibrated on the bike ready for testing

    Post process data from the Bike Magazine test, allowing us to understand ride frequency

  • REVIVING A LEGEND - HOW GTME CREATED THE PWM JPN REPLICA

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