GOLF SWING ANALYSIS DEVICE AND GOLF SWING ANALYSIS METHOD

• US 20140135139A1
• Filed: 11/12/2013
• Published: 05/15/2014
• Est. Priority Date: 11/13/2012
• Status: Active Grant

• Current Assignee: KEIO University, Seiko Epson Corporation (Seiko Group)
• Original Assignee: KEIO University, Seiko Epson Corporation (Seiko Group)
• Inventors: SHIBUYA, Kazuhiro, OTA, Ken
• Granted Patent: US 9,604,101 B2
• Time in Patent Office: Days
• US Class Current: 473/207
• CPC Class Codes: A63B 24/0006 Computerised comparison for qualitative assessment of motion sequences or the course of a movement
• CPC Class Codes: A63B 69/3632 Clubs or attachments on clubs, e.g. for measuring, aligning A63B69/3614 takes precedence; clubs for swinging exercises in general A63B15/00
• CPC Class Codes: G09B 19/0038 Sports

Abstract

A golf swing analysis device includes a joint force calculation section and a torque extraction section. The joint force calculation section generates a double pendulum model that includes a first link that corresponds to an upper part of a body of a golfer, a second link that corresponds to a golf club, and a joint that links the first link and the second link, and calculates a joint force applied to the joint along with a swing motion using an acceleration measured by an inertial sensor attached to the golf club. The torque extraction section extracts a torque that causes the second link to make a rotational motion around a first axis from the joint force.

Claims

1. A golf swing analysis device comprising:

a joint force calculation section that generates a double pendulum model that includes a first link that corresponds to an upper part of a body of a golfer, a second link that corresponds to a golf club, and a joint that links the first link and the second link, and calculates a joint force applied to the joint along with a swing motion using an acceleration measured by a first inertial sensor attached to the golf club; and

a torque extraction section that extracts a torque that causes the second link to make a rotational motion around a first axis from the joint force.

2. The golf swing analysis device as defined in claim 1,

the first axis being an axis that is orthogonal to a longitudinal axis of the second link that corresponds to the golf club.

3. The golf swing analysis device as defined in claim 2,

the first axis being an axis that is orthogonal to the longitudinal axis of the second link that corresponds to the golf club and a travel direction of the second link.

4. The golf swing analysis device as defined in claim 1, further comprising:

a torque change detection section that detects a timing at which a sign of the torque detected by the torque extraction section changes.

5. The golf swing analysis device as defined in claim 1,

the joint force calculation section calculating at least one component among a plurality of components obtained by decomposing the joint force using at least one of an angular velocity measured by the first inertial sensor, an acceleration measured by a second inertial sensor attached to the upper part of the body of the golfer, and an angular velocity measured by the second inertial sensor, and

the torque extraction section extracting a torque component that causes the second link to make a rotational motion around the first axis from each of the plurality of components of the joint force calculated by the joint force calculation section.

6. The golf swing analysis device as defined in claim 1,

the joint force calculation section calculating a component of the joint force in a travel direction of the second link using an angular velocity measured by the first inertial sensor, and calculating a component of the joint force in a longitudinal axis direction of the first link using an angular velocity measured by a second inertial sensor attached to the upper part of the body of the golfer, and

the torque extraction section extracting a torque component that causes the second link to make a rotational motion around the first axis from each of the component in the travel direction of the second link and the component in the longitudinal axis direction of the first link calculated by the joint force calculation section.

7. The golf swing analysis device as defined in claim 4, further comprising:

an analytical information generation section that generates analytical information about a natural swing using the timing detected by the torque change detection section at which the sign of the torque changes, or the torque component extracted by the torque extraction section.

8. The golf swing analysis device as defined in claim 5, further comprising:

an analytical information generation section that generates analytical information about a natural swing using the timing detected by the torque change detection section at which the sign of the torque changes, or the torque component extracted by the torque extraction section.

9. The golf swing analysis device as defined in claim 6, further comprising:

an analytical information generation section that generates analytical information about a natural swing using the timing detected by the torque change detection section at which the sign of the torque changes, or the torque component extracted by the torque extraction section.

10. The golf swing analysis device as defined in claim 1,

the first link corresponding to a virtual line that connects a center point of a line that connects the shoulders of the golfer and a grip of the golf club.

11. A golf swing analysis device comprising:

a joint force calculation section that generates a double pendulum model that includes a first link that corresponds to an upper part of a body of a golfer, a second link that corresponds to a golf club, and a joint that links the first link and the second link, and calculates at least one component among a plurality of components obtained by decomposing a joint force applied to the joint along with a swing motion using at least one of an angular velocity measured by a first inertial sensor attached to the golf club, an acceleration measured by a second inertial sensor attached to the upper part of the body of the golfer, and an angular velocity measured by the second inertial sensor; and

a torque extraction section that extracts a torque that causes the second link to make a rotational motion around a first axis from each component of the joint force calculated by the joint force calculation section.

12. A golf swing analysis method comprising:

a joint force calculation step that generates a double pendulum model that includes a first link that corresponds to an upper part of a body of a golfer, a second link that corresponds to a golf club, and a joint that links the first link and the second link, and calculates a joint force applied to the joint along with a swing motion using an acceleration measured by a first inertial sensor attached to the golf club; and

a torque extraction step that extracts a torque that causes the second link to make a rotational motion around a first axis from the joint force.