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Swing analysis method using a swing plane reference frame

  • US 10,617,926 B2
  • Filed: 06/26/2017
  • Issued: 04/14/2020
  • Est. Priority Date: 07/19/2016
  • Status: Active Grant
First Claim
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1. A swing analysis method using a swing plane reference frame, comprisingobtaining sensor data from a sensor coupled to a piece of equipment or bat during a swing of said piece of equipment or bat by a user to hit or contact a ball,wherein said piece of equipment or bat comprising a longitudinal axis and where said piece of equipment or said bat has rotational symmetry around said longitudinal axis,wherein said piece of equipment or bat is configured to be held by a user in any orientation rotated around said longitudinal axis during said swing, andwherein said sensor comprises a processor;

  • determining a time of impact between said piece of equipment or bat and said ball from said sensor data via said processor;

    calculating a trajectory during said swing from said sensor data via said processor, said trajectory comprising a time series of motion data samples, wherein each motion data sample of said motion data samples comprising one or more ofa position;

    an orientation;

    a velocity;

    an angular velocity;

    an acceleration; and

    ,an angular acceleration;

    calculating an impact velocity vector from said trajectory as said velocity of said piece of equipment or bat at said time of impact via said processor;

    defining a swing plane reference frame via said processor, wherein said swing plane reference plane comprisinga first axis defined by a longitudinal axis of said piece of equipment or bat at said time of impact;

    a second axis defined by said impact velocity vector; and

    ,a third axis orthogonal to a swing plane spanned by said first axis and said second axis;

    transforming said trajectory to said swing plane reference frame to form a swing plane frame trajectory via said processor; and

    ,analyzing said swing plane frame trajectory to create one or more swing metrics that describe said swing of said piece of equipment or bat by said user via said processor.

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