JP2014160025A5 - - Google Patents
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- JP2014160025A5 JP2014160025A5 JP2013031097A JP2013031097A JP2014160025A5 JP 2014160025 A5 JP2014160025 A5 JP 2014160025A5 JP 2013031097 A JP2013031097 A JP 2013031097A JP 2013031097 A JP2013031097 A JP 2013031097A JP 2014160025 A5 JP2014160025 A5 JP 2014160025A5
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- rotational speed
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- 230000000007 visual effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
- 230000003595 spectral Effects 0.000 description 1
Description
また、野球の投手の投げるボールの回転速度は、40rpsを超える場合があり、このような高速回転している球体の回転速度を計測することは、ジャイロセンサでは困難であるという問題がある。 In addition, the rotation speed of the ball throw the baseball pitcher, there is a case where more than 40rp s, it is to measure the rotation speed of the sphere that is such a high-speed rotation, there is a problem that it is difficult in the gyro sensor.
なお、磁気センサによる地磁気ベクトル検出の時間間隔は4msecとした。これにより、仮に50rpsの速度でピンポン玉が回転した場合でも1回転につき5点以上のデータを検出し、記憶できるため、50rps程度までの回転速度であれば、精度の良い検出が期待できる。以上説明した実験により得た磁気センサの検出信号の時間変化を図1〜図3に示す。なお、本実施例では、磁気センサとして3軸の磁気センサを用いているため、データは3軸方向の信号が得られているが、図1〜図3には、そのうちの変動が最も大きかった1軸方向のデータを示した。また回転速度もこの変動が最も大きかった軸方向のデータを用いて算出した。前記した通り、回転速度を3水準で実験を行い、最も回転速度が遅い場合の図が図1、中間速度の図が図2、最も回転速度が速い場合が図3である。この図より、目視でカウントした結果、それぞれの回転速度が15.0rps、27.3rps、51.3rpsであることを確認した。なお、図をみると磁気測定値の値がマイナス側にずれているが、これはオフセット補正をしていないためである。 The time interval for detecting the geomagnetic vector by the magnetic sensor was 4 msec. Thus, if a ping-pong ball detects data of more than 5 points per revolution even when rotated at a speed of 50Rp s, since that can be stored, if the rotational speed of up to about 50Rp s, can be expected a good detection accuracy . The time change of the detection signal of the magnetic sensor obtained by the experiment described above is shown in FIGS. In this embodiment, since a triaxial magnetic sensor is used as the magnetic sensor, a signal in the triaxial direction is obtained as the data, but the fluctuations are the largest in FIGS. Data in one axis direction are shown. The rotational speed was also calculated using the data in the axial direction where the fluctuation was the largest. As described above, the experiment was carried out at three rotational speeds. FIG. 1 shows the case where the rotational speed is the slowest, FIG. 2 shows the intermediate speed, and FIG. 3 shows the case where the rotational speed is the fastest. From this figure, the results counted by visual observation, each of the rotational speed was confirmed to be 15.0rp s, 27.3rp s, 51.3rp s . In the figure, the value of the magnetic measurement value is shifted to the minus side because the offset is not corrected.
しかしながら、実際の使用を考えると、目視でみてカウントするのではなく、自動で回転速度を算出し、スマートフォン等の携帯機器やPC等に自動で回転速度が表示されるようにすることが望ましい。そこで、図1〜図3のデータを用いてFFT処理を行い、パワースペクトル密度が最大となる周波数を求めることにより回転速度を算出した。その結果、図1のデータから求めた回転速度が15.6rps、図2のデータから求めた回転速度が28.7rps、図3のデータから求めた回転速度が50.7rpsとなり、目視で求めた回転速度とほぼ一致する結果が得られた。その他、図示しない他の条件でも実験を行ったが、同様に目視で求めた回転速度とFFT処理により求めた回転速度はほぼ一致することが確認できた。 However, in consideration of actual use, it is desirable that the rotational speed is automatically calculated and automatically displayed on a portable device such as a smartphone or a PC, instead of counting visually. Therefore, the rotational speed was calculated by performing FFT processing using the data of FIGS. 1 to 3 and obtaining the frequency at which the power spectral density is maximum. As a result, the rotational speed is 15.6Rp s obtained from the data of FIG. 1, the rotational speed is 28.7Rp s obtained from the data of FIG. 2, the rotational speed 50.7Rp s next determined from the data of FIG. 3, visual The results were almost the same as the rotation speed obtained in (1). In addition, the experiment was performed under other conditions (not shown), and it was confirmed that the rotational speed obtained by visual observation and the rotational speed obtained by FFT processing were almost the same.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2013031097A JP5816880B2 (en) | 2013-02-20 | 2013-02-20 | Sphere rotation speed detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2013031097A JP5816880B2 (en) | 2013-02-20 | 2013-02-20 | Sphere rotation speed detection device |
Publications (3)
Publication Number | Publication Date |
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JP2014160025A JP2014160025A (en) | 2014-09-04 |
JP2014160025A5 true JP2014160025A5 (en) | 2015-04-16 |
JP5816880B2 JP5816880B2 (en) | 2015-11-18 |
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JP2013031097A Active JP5816880B2 (en) | 2013-02-20 | 2013-02-20 | Sphere rotation speed detection device |
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6332184B2 (en) | 2015-07-21 | 2018-05-30 | 愛知製鋼株式会社 | Rotational speed measurement system |
JP6332307B2 (en) * | 2015-11-10 | 2018-05-30 | 愛知製鋼株式会社 | Ball rotation direction detection system |
JP6350733B1 (en) | 2017-03-30 | 2018-07-04 | 愛知製鋼株式会社 | Ball rotation measurement system |
JP2018112567A (en) * | 2018-04-26 | 2018-07-19 | 愛知製鋼株式会社 | Rotary speed measurement system |
AU2020332884B2 (en) * | 2019-08-21 | 2023-12-14 | SeeHow Pte. Ltd. | Systems and methods for measuring the rate of angular displacement using magnetic field sensing |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003322657A (en) * | 2002-05-01 | 2003-11-14 | Yamaha Corp | Detector for detecting number of revolution by magnetism |
JP2008151534A (en) * | 2006-12-14 | 2008-07-03 | Chiba Univ | Magnetic flux measurement method and magnetic sensor |
JP5196581B2 (en) * | 2009-04-22 | 2013-05-15 | 国立大学法人信州大学 | Sphere rotation detection apparatus and method |
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2013
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