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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

Inactive Publication Date: 2012-06-13
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, the measurement of the moment of inertia of a spherical shell-shaped object such as a table tennis ball generally uses the formula However, due to the need to measure the quality of table tennis and the inner and outer radii when using this method, there are multiple measurement errors, which will greatly reduce the accuracy of the measurement.
Moreover, due to the large randomness of uneven quality and insufficient roundness of table tennis balls, especially the measurement of the inner diameter is more complicated and difficult, indirect measurement methods are generally used, such as by injecting water into the table tennis balls to measure the quality of the water, thereby Calculate inner diameter

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  • Tool and method for measuring rotational inertia of table tennis ball

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Embodiment Construction

[0016] The content of the invention will be further described in detail below with reference to the accompanying drawings and specific implementation.

[0017] Piano wire torsion measurement table tennis schematic diagram such as figure 1 As shown, E is the base of the measuring device, D is a vertical bar, C is a horizontal bar, A is hanging the object to be tested, and B is a piano wire with a diameter of 0.15mm. Let the mass of the standard disc used in the measurement be M, the radius be R, and its moment of inertia be I 0 , the moment of inertia of the table tennis ball to be measured is I S .

[0018] The measurement steps are as follows:

[0019] 1. According to the measuring device, hang the standard disk at A, and twist it at a certain angle, so that the piano wire can rotate freely, record the number of rotations n and time t, and obtain the rotation period T 0 =t / n;

[0020] 2. Using Formula I 0 =1 / 2MR 2 , get the standard disc moment of inertia I 0 ;

[00...

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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.

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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Application Information

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IPC IPC(8): G01M1/10
Inventor 曹先胜何祖明
Owner CHANGZHOU UNIV
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