Bando Chemical Industries, Inc.

Sri Sports Limited

Bycen Co., Ltd.

Yasushi Chida

Hirofumi Miyata

Yoshikazu Wakizaka

Keiji Moriyama

Kazuya Kamino

A more accurate tension of a belt or a more accurate target natural frequency of the belt when the belt tension is adjusted is determined. A method for calculating a belt tension includes receiving a natural frequency of a belt and a span; performing calculation for determining a tension of the belt using a predetermined expression, based on the natural frequency, the span, and a unit mass of the belt read from a memory; and displaying the tension on a display, wherein in a case where the span is within a predetermined range corresponding to the belt, the predetermined expression is corrected so that an error caused by a bending stiffness of the belt is reduced.

Belt tension calculating program, belt natural frequency calculating program, method and device for calculating belt tension, and method and device for calculating belt natural frequency

A natural-frequency measurement device for measuring the natural frequency of a belt includes: an acceleration sensor attached to a portion of the belt between an adjacent pair of pulleys to sense acceleration resulting from the vibration of the belt; and a measuring instrument configured to measure the natural frequency of the belt based on the acceleration sensed by the acceleration sensor.

Natural-frequency measurement device

A swing analysis method of the present invention includes steps of: preparing a radio type acceleration measuring devicecapable of measuring respective accelerations in three axis directions; mounting the acceleration measuring deviceto a golf player's body t; receiving measured data from the acceleration measuring deviceduring a swing through radio communication; and analyzing a golf swing based on the acceleration data. Preferably, the acceleration measuring device is attached to each of two or more portions of the tester t. Preferably, an attached position of the acceleration measuring device is any part selected from the group consisting of a head, a neck, a shoulder, a back, a waist and a wrist. Preferably, a weight of the acceleration measuring device is equal to or more than 10 g.

Growing community of inventors

Hyogo, Japan

Yasushi Chida