Motion analysis device and motion analysis method for analyzing deformation of measurement object

Abstract

A motion analysis device includes two posture angle sensors attached to a measurement object at locations distant from each other, a data acquisition section, a posture angle correction section, and a deformation amount calculation section. The data acquisition section acquires data of a first posture angle and a second posture angle respectively detected by the posture angle sensors. The posture angle correction section corrects a difference between the first posture angle and the second posture angle after starting a motion of the measurement object in accordance with a difference between the first posture angle and the second posture angle before starting the motion of the measurement object. The deformation amount calculation section calculates a deformation amount of the measurement object based on a difference between the first posture angle and the second posture angle corrected by the posture angle correction section.

What is claimed is: 
     
         1 . A central processing unit comprising:
 a data acquisition section adapted to acquire data of a first posture angle outputted from a first posture angle sensor attached a measurement object and a second posture angle outputted from a second posture angle sensor attached the measurement object;   a posture angle correction section adapted to correct a difference between the first posture angle and the second posture angle after starting a motion of the measurement object in accordance with a difference between the first posture angle and the second posture angle before starting the motion of the measurement object; and   a deformation amount calculation section adapted to calculate a deformation amount of the measurement object based on a difference between the first posture angle and the second posture angle corrected by the posture angle correction section.   
     
     
         2 . The central processing unit according to  claim 1 , wherein
 the posture angle correction section performs the correction by subtracting the difference between the first posture angle and the second posture angle before starting the motion of the measurement object from the difference between the first posture angle and the second posture angle after starting the motion of the measurement object.   
     
     
         3 . A central processing unit comprising:
 a data acquisition section adapted to acquire data of a first posture angle and a first angular velocity outputted from a first posture angle sensor attached a measurement object, a second posture angle and a second angular velocity outputted from a second posture angle sensor attached the measurement object;   an angular velocity correction section adapted to correct a difference between the first angular velocity and the second angular velocity in accordance with a difference between the first posture angle and the second posture angle; and   a deformation amount calculation section adapted to calculate a deformation amount of the measurement object by integrating the difference between the first angular velocity and the second angular velocity corrected by the angular velocity correction section.   
     
     
         4 . The central processing unit according to  claim 3 , wherein
 the angular velocity correction section corrects the difference between the first angular velocity and the second angular velocity by converting one of the first angular velocity and the second angular velocity into an angular velocity with respect to a detection axis of the other of the first angular velocity and the second angular velocity in accordance with the difference between the first posture angle and the second posture angle, and calculating a difference between the first angular velocity and the second angular velocity the one of which is converted.   
     
     
         5 . The central processing unit according to  claim 1 , wherein
 the measurement object is a golf club.   
     
     
         6 . The central processing unit according to  claim 3 , wherein
 the measurement object is a golf club.   
     
     
         7 . The central processing unit according to  claim 5 , wherein
 the first posture angle sensor is attached to one of a grip section and a shaft section of the golf club, and   the second posture angle sensor is attached to a head section of the golf club.   
     
     
         8 . The central processing unit according to  claim 6 , wherein
 the first posture angle sensor is attached to one of a grip section and a shaft section of the golf club, and   the second posture angle sensor is attached to a head section of the golf club.   
     
     
         9 . A motion analysis method of a measurement object, comprising:
 acquiring data of a first posture angle outputted from a first posture angle sensor attached a measurement object and a second posture angle outputted from a second posture angle sensor attached the measurement object;   correcting a difference between the first posture angle and the second posture angle after starting a motion of the measurement object in accordance with a difference between the first posture angle and the second posture angle before starting the motion of the measurement object; and   calculating a deformation amount of the measurement object based on a difference between the first posture angle and the second posture angle corrected in the correcting.   
     
     
         10 . A motion analysis method of a measurement object, comprising:
 acquiring data of a first posture angle and a first angular velocity outputted from a first posture angle sensor attached a measurement object, a second posture angle and a second angular velocity outputted from a second posture angle sensor attached the measurement object;   correcting a difference between the first angular velocity and the second angular velocity in accordance with a difference between the first posture angle and the second posture angle; and   calculating a deformation amount of the measurement object by integrating the difference between the first angular velocity and the second angular velocity corrected in the correcting.