CN102637377B - Rotational inertia tester capable of measuring gravity acceleration - Google Patents
Rotational inertia tester capable of measuring gravity acceleration Download PDFInfo
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- CN102637377B CN102637377B CN201210107237.0A CN201210107237A CN102637377B CN 102637377 B CN102637377 B CN 102637377B CN 201210107237 A CN201210107237 A CN 201210107237A CN 102637377 B CN102637377 B CN 102637377B
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- fork
- gravity acceleration
- pendulum
- oscillating bar
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Abstract
The invention discloses a rotational inertia tester capable of measuring gravity acceleration, relating to the measurement of gravity acceleration. The period formula of torsional pendulum rotation and the period formula of compound pendulum swinging have the same form, thus, a torsional pendulum rotation inertia tester can be used for measuring the gravity acceleration by certain combination. According to the technical scheme, when an oscillating bar is vertical, the oscillating bar becomes a compound pendulum, the measurement period T1 = 2*Pi*(I/(mgh))1/2; when the oscillating bar is fixed, the period T2 = 2*Pi*(I/(mgh+K))1/2; when the oscillating bar is horizontal, the period T3 = 2*Pi*(I/K)1/2; and h is known, the mass of the oscillating bar and the three periods are measured so as to obtain the gravity acceleration g. The tester is changed less; the tester is simple to regulate and quick in measurement; the functions of the torsional pendulum are expanded; the torsional pendulum and the compound pendulum are linked effectively, knowledge fusion is improved, expansion of the visual field of students is facilitated, and the students are helped to understand the knowledge deeply.
Description
Technical field
The present invention relates to the measurement of acceleration of gravity, particularly with a kind of special moment of inertia testing apparatus, measure acceleration of gravity.
Background technology
Moment of inertia testing apparatus is used for measuring moment of inertia, general employing rocks to measure moment of inertia, the Period Formula that rocks measurement moment of inertia is identical with the Period Formula form of physical pendulum measurement acceleration of gravity, therefore through certain combination, just can measure acceleration of gravity with torsional pendulum moment of inertia testing apparatus.
Summary of the invention
For realizing torsional pendulum moment of inertia testing apparatus, measure acceleration of gravity, the present invention is by two orthogonal horizontal adjustment platform of torsional pendulum moment of inertia testing apparatus design.
The technical scheme that the present invention solves its technical matters employing is: have one-period tester to measure hunting period, have the quality of a balance measurement fork.Rock vertically, adjusting base Level tune screw makes fork vertical, swings fork, is now a physical pendulum, and cycle and moment of inertia meet formula T
1=2*Pi*(I/ (mgh))
1/2, T wherein
1hunting period, Pi=3.14156, I is moment of inertia, m is quality, can pass through balance measurement, g is acceleration of gravity, h be hitch point to the distance of barycenter, for symmetric fork, barycenter is positioned at geometric center, h is a known quantity; Then fork is fixed, continued to swing, measure its cycle, the torsion constant of cycle now and moment of inertia and torsionspring meets T
2=2*Pi*(I/ (mgh+K))
1/2, T wherein
2be hunting period, K is the torsion constant of torsionspring; Finally rock level, adjusting base Level tune screw makes fork level, then swings fork, measures hunting period, and now the torsion constant of hunting period and spring meets T
3=2*Pi*(I/K)
1/2; Known h, measuring oscillating bar quality, measures period T
1, T
2, T
3with three variable I, g, K, simultaneous solution obtains gravity acceleration g.
The invention has the beneficial effects as follows: instrument is changed fewer; Regulate simple; Physical pendulum is measured acceleration of gravity relatively, measures fast; Relatively rock, its function is expanded; Effective connection is rocked and physical pendulum, improves the fusion of knowledge, is conducive to expand student's the visual field, improves the understanding of student to knowledge.
Accompanying drawing explanation
Fig. 1 be can measure acceleration of gravity rock instrument schematic diagram.
Wherein, 1, base, 2, Level tune screw, 3, torsionspring, 4, gib screw, 5, fork.
Embodiment
Fork 5 be one have suppending hole can be fixing fork symmetrically of material, on fork, have a millimeter rule, the centroid position of fork and each pendulum hole can be read to the distance of barycenter.
The Level tune screw of adjusting base 1, makes fork 5 vertical, and now fork becomes a physical pendulum, measures the rotation period T of physical pendulum
1; Then fork is fixing by gib screw 4, fork, at the acting in conjunction lower swing of gravity and torsionspring 3, is measured rotation period T now
2; Finally will rock placement level, fork, at the effect lower swing of torsionspring, is measured rotation period T
3; The quality of measuring oscillating bar and read suppending hole to the distance of barycenter, just can calculate local acceleration of gravity.
Claims (1)
1. the moment of inertia testing apparatus that can measure acceleration of gravity, by a torsional pendulum moment of inertia testing apparatus, fork, one-period tester and a balance, formed, it is characterized in that: torsional pendulum moment of inertia testing apparatus has two orthogonal bases, each base respectively has three Level tune screws; Fork be one have suppending hole can be fixing the uniform symmetrical fork of material, on fork, have a millimeter rule; Periodic tester is measured hunting period, the quality of balance measurement fork.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210107237.0A CN102637377B (en) | 2012-04-13 | 2012-04-13 | Rotational inertia tester capable of measuring gravity acceleration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210107237.0A CN102637377B (en) | 2012-04-13 | 2012-04-13 | Rotational inertia tester capable of measuring gravity acceleration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102637377A CN102637377A (en) | 2012-08-15 |
| CN102637377B true CN102637377B (en) | 2014-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210107237.0A Expired - Fee Related CN102637377B (en) | 2012-04-13 | 2012-04-13 | Rotational inertia tester capable of measuring gravity acceleration |
Country Status (1)
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| CN (1) | CN102637377B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971569B (en) * | 2014-05-04 | 2016-03-02 | 四川大学 | Pressure extending physical pendulum pendulum length measures acceleration of gravity |
| CN103985290A (en) * | 2014-05-04 | 2014-08-13 | 四川大学 | Method for measuring gravity acceleration by sleeving cylinder to increase compound pendulum length |
| CN103971570B (en) * | 2014-05-04 | 2016-05-18 | 四川大学 | Water filling extends physical pendulum pendulum length and measures acceleration of gravity |
| CN112885203B (en) * | 2021-03-01 | 2022-04-22 | 河南大学 | Gravity acceleration measuring device based on rotational inertia |
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| CN2359763Y (en) * | 1999-03-01 | 2000-01-19 | 中国地质大学（武汉） | Double-suspension torsional pendulum device |
| CN1945658A (en) * | 2006-11-01 | 2007-04-11 | 四川大学 | Composite twistless compound pendulus rod |
| CN1945659A (en) * | 2006-11-01 | 2007-04-11 | 四川大学 | Combined twistless compound pendulum |
| CN1945660A (en) * | 2006-11-01 | 2007-04-11 | 四川大学 | Twistless compound pendulum rod |
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2012
- 2012-04-13 CN CN201210107237.0A patent/CN102637377B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2190812Y (en) * | 1993-07-12 | 1995-03-01 | 刘璞 | Multipurpose rigid-body rotation experiment instrument |
| CN2359763Y (en) * | 1999-03-01 | 2000-01-19 | 中国地质大学（武汉） | Double-suspension torsional pendulum device |
| CN1945658A (en) * | 2006-11-01 | 2007-04-11 | 四川大学 | Composite twistless compound pendulus rod |
| CN1945659A (en) * | 2006-11-01 | 2007-04-11 | 四川大学 | Combined twistless compound pendulum |
| CN1945660A (en) * | 2006-11-01 | 2007-04-11 | 四川大学 | Twistless compound pendulum rod |
Non-Patent Citations (14)
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| 丁红伟 等.关于传统扭摆法测物体转动惯量实验的改进.《大学物理实验》.2010,第23卷(第4期),第53-55页. |
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| 刚体转动惯量的一种新型测量法——复摆法;徐军华;《西安邮电学院学报》;20040731;第9卷(第3期);第92-94页 * |
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| 章子旭.另一种用物理摆测重力加速度的方法.《大学物理实验》.2005,第18卷(第4期),第52-54页. |
| 袁昌盛 等.改进复摆法测量转动惯量的方法和设备研究.《中国机械工程》.2006,第17卷(第6期),第598-600页. |
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|---|---|
| CN102637377A (en) | 2012-08-15 |
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