Tool and method for measuring rotational inertia of table tennis ball

A moment of inertia and table tennis technology, applied in the field of moment of inertia measurement tools, can solve the problems of complex, difficult and large randomness in measurement
CN102494844AInactive Publication Date: 2012-06-13CHANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHANGZHOU UNIV
Publication Date
2012-06-13
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a method for measuring the rotational inertia of a table tennis ball, which includes the steps: hanging a piano wire B with the diameter of 0.15mm on a cross bar C; hanging a disk with a mass M and a radius R below the piano wire B, recording the turn number n and the time t of rotation of the disk, computing the rotational period T0=t / n of the disk at the moment and obtaining the rotational inertia I0 of the disk M by means of the formula I0=1 / 2MR2; hanging the table tennis ball to be measured below the piano wire B and similarly measuring the rotational period TS of the table tennis ball; and obtaining the rotational inertia IS=A2I0 of the table tennis ball below the piano wire according to the equation of the torsion constant and the rotational period K=T2I / (4 pi 2), wherein A=T0 / TS. The invention further provides a tool for measuring the rotational inertia of the table tennis ball. The method breaks through the limitations of original computational formulas, and only the rotational period is measured creatively, so that measurement of the rotational inertia of the table tennis ball has more rules to follow and is more convenient and more operable.
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Description

technical field

[0001] The invention relates to a tool and a method for measuring the moment of inertia, in particular to a tool and a method for measuring the moment of inertia of a table tennis ball by a torsional moment method. Background technique

[0002] The rotation of the table tennis ball has attracted more and more attention in modern table tennis technology, and the speed of the ball's rotation mainly depends on the angular acceleration. According to the law of rotation, when the same torque acts on objects with different moment of inertia, the angular acceleration produced by the object with small moment of inertia is large, while the angular acceleration produced by the object with large moment of inertia is small. Therefore, the research on the moment of inertia of table tennis will help to improve the change of the rotation of the ball. But so far, the measurement of the moment of inertia of a spherical shell-shaped object such as a table tennis ball generall...

Claims

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