Swing analysis method using a sweet spot trajectory
First Claim
1. A swing analysis method using a sweet spot trajectory, comprising:
- obtaining a time series of sensor data from a sensor coupled to a piece of equipment during a swing of said piece of equipment, wherein said sensor comprisesa three-axis accelerometer that generates acceleration data; and
,a three-axis gyroscope that generates angular velocity data;
such that said sensor data comprises said acceleration data and said velocity data;
determining a time of impact of said swing from said time series of said sensor data;
obtaining a location of a sweet spot of said piece of equipment,wherein said sweet spot comprises a location on said piece of equipment, a range of location on said piece of equipment or a shape of an area on said piece of equipment where an impact occurs that produces a maximum energy transfer of said swing at a predefined threshold or value;
defining a reference frame from said sensor data;
calculating a trajectory of said sweet spot relative to said reference frame based on said sensor data; and
,calculating one or more swing metrics based on said trajectory of said sweet spot and on said time of impact.
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Accused Products
Abstract
A method for analyzing sensor data from baseball swings (or swings in similar sports) that transforms data into a reference frame defined by the bat orientation and velocity at impact. The trajectory of the sweet spot of the bat is tracked through the swing, and is analyzed to generate metrics describing the swing. A two-lever model of the swing may be used to model the effects of body rotation and wrist rotation. Data may be analyzed to identify relevant events during the swing such as start of downswing, commit (wrist release), on-plane, peak bat speed, and impact. Illustrative swing metrics derived from the sweet spot trajectory, the swing plane reference frame, and the two-lever model include: forward bat speed, on-plane rotation, hinge angle at commit, hinge angle at impact, body rotation ratio, body tilt angle, and swing plane tilt angle.
383 Citations
30 Claims
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1. A swing analysis method using a sweet spot trajectory, comprising:
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obtaining a time series of sensor data from a sensor coupled to a piece of equipment during a swing of said piece of equipment, wherein said sensor comprises a three-axis accelerometer that generates acceleration data; and
,a three-axis gyroscope that generates angular velocity data; such that said sensor data comprises said acceleration data and said velocity data; determining a time of impact of said swing from said time series of said sensor data; obtaining a location of a sweet spot of said piece of equipment, wherein said sweet spot comprises a location on said piece of equipment, a range of location on said piece of equipment or a shape of an area on said piece of equipment where an impact occurs that produces a maximum energy transfer of said swing at a predefined threshold or value; defining a reference frame from said sensor data; calculating a trajectory of said sweet spot relative to said reference frame based on said sensor data; and
,calculating one or more swing metrics based on said trajectory of said sweet spot and on said time of impact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification