compensates for drift error by removing a mean angular acceleration value for a given stride before integrating.ħ. calculates angular velocity by integrating the angular acceleration values and b. The motion analysis system of claim 1 wherein the processor a.
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The motion analysis system of claim 3 wherein the processor determines full footfall at a point in the stride that corresponds to a predetermined time after heel strike.Ħ. The motion analysis system of claim 3 wherein the processor determines full foot fall at a point in the stride that corresponds to a minimum angle of rotation.ĥ. determining the angle of rotation values relative to the datum plane.Ĥ. defining for a given stride of a gait a datum plane at full foot fall, and b. The motion analysis system of claim 1 wherein the processor compensates for drift by a. the processor determines the angle of rotation values based on the measurements made by the parallel accelerometers.ģ. the plurality of accelerometers include two parallel and co-planar accelerometers that are spaced a known distance apart and b. The motion analysis system of claim 1 wherein a. calculating velocity in a selected direction based on the calculated angle of rotation values and the measurements made by the accelerometers.Ģ. calculating angle of rotation values from the corrected angular acceleration values, iv. compensating for drift errors in the measurements made by the accelerometers to produce corrected angular acceleration values, iii. determining angular acceleration values based on the measurements made by the accelerometers, ii. a plurality of accelerometers for making acceleration measurements B. The embodiments of the invention in which anĮxclusive property or privilege is claimed are defined asġ. 1993.Īminian et al., “Estimation of Speed & Incline of Walking Using Neutral Networks”, IEEE Transactions on Instrumentation & Measurement, vol. Nusholtz, “Geometric Methods in Determining Rigid-Body Dynamics”, Experimental Dynamics, Jun. 10, 1991, Pergamon Press, Great Britain, pp. Lafortune, “Three-Dimensional Acceleration of the Tibia During Walking and Running”, Journal of Biomechanics, vol.
Macomber, “Some Operations Aspects of Inertial Surveying Systems”, pp. Hayes, “Leg Motion Analysis During Gait by Multiaxial Accelerometry: Theoretical Foundations and Preliminary Validations”, Journal of Biomechanical Engineering, Aug. Shea, “Computing Body Segment Trajectories in Hybrid III Dummy Using Linear Accelerometer Data”, Journal of Biomechanical Engineering, Feb. Mital, “Computation of Rigid-Body Rotation in Three-Dimensional Space From Body-Fixed Linear Acceleration Measurements”, Journal of Applied Mechanics, Dec. Morris, “Acceleromety-A Technique for the Measurement of Human Body Movements”, J. Oil well bore hole surveying by kinematic navigationĭevice for determining the speed, distance traversed, elapsed time and calories expended by a person while running Method and device for the selection of an insole and/or of a shoe that adjusts the posture of the footĭevice for taking the measurements of the various component elements of the movement of a moving body Interactive system for measuring physiological exertion Time of motion, speed, and trajectory height measuring deviceĭead reckoning navigational system using accelerometer to measure foot impacts System and method for measuring movement of objects The average of the foot velocity corresponds to the subject's gait speed. The two orthogonal accelerations are then resolved into a net horizontal acceleration or other selected direction which may be integrated to find the foot velocity in the selected direction. Angular orientation of the foot may be determined by double integration of the foot's angular acceleration (which requires a third accelerometer substantially parallel to one of the two orthogonal accelerometers). The acceleration is determined using a small cluster of two mutually perpendicular accelerometers mounted on a shoe. These variables may be resolved into a selected direction thereby permitting both relative and absolute kinematic quantities to be determined. A device comprised of at least a pair of accelerometers and a tilt sensor mounted in fixed relation to a datum plane defining surface (sole of a shoe) may be used for extracting kinematic variables including linear and rotational acceleration, velocity and position.