CN203786971U - Rigid body rotational inertia influencing factor demonstration instrument - Google Patents
Rigid body rotational inertia influencing factor demonstration instrument Download PDFInfo
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- CN203786971U CN203786971U CN201420059416.6U CN201420059416U CN203786971U CN 203786971 U CN203786971 U CN 203786971U CN 201420059416 U CN201420059416 U CN 201420059416U CN 203786971 U CN203786971 U CN 203786971U
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 9
- 239000011521 glass Substances 0.000 abstract description 4
- 230000008602 contraction Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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Abstract
A rigid body rotational inertia influencing factor demonstration instrument is disclosed, and the demonstration instrument is specifically capable of realizing macroscopic effect demonstration of influence exerted on rotational inertia respectively by the mass, the mass distribution and the position of a rotating shaft of a rigid body. According to the demonstration instrument, three identical round discs made of synthetic glass materials are adopted, and ten round-hole-shaped counterweight arrangement grooves that are consistent in specification and distribution are made on each round disc; a bearing clamping groove is made at each of a mass center shaft and a part, ten millimeters away from the mass center shaft, of each round disc; a wheel tooth structure is adopted at the edge of each round disc. Vertical support shafts that are the same in height are arranged on a horizontal base, and bearings are respectively arranged on the upper ends of the two support shafts. The round discs are connected with the vertical support shafts through the bearing clamping grooves and the bearings. An elastic steel sheets arranged between two round discs is used, respective demonstration of rotational inertia influencing factors can be realized through adjustment of a round disc number, distribution of counterweights on the round disc, the rotating shaft position and the like.
Description
Technical field
The utility model relates to a kind of apparatus for demonstrating of solid moment of inertia influence factor, particularly can realize respectively quality, mass distribution, the macro-effect demonstration of rotating shaft position on moment of inertia impact of rigid body.
Background technology
At present, known solid moment of inertia apparatus for demonstrating generally by some identical in quality, diameter is identical but cylinder shape rigid body that mass distribution is different, and arc orbit composition.
In practical operation, different cylinders are discharged from arc orbit upper end sustained height simultaneously, another down rolls.Due to mass distribution difference, cause the moment of inertia difference of cylinder, under identical gravitational torque effect, the rollers roll speed that moment of inertia is little, the rollers roll speed that moment of inertia is large is slower.By the variation of rolling speed, carry out the impact that quality of presentation distributes on moment of inertia.
Problem is the impact that this known solid moment of inertia apparatus for demonstrating can only quality of presentation distributes on moment of inertia, and the rotating shaft of this device is moved.In fact, affect solid moment of inertia because have 3, be respectively the position of quality, mass distribution, fixed rotating shaft.In the time having both to keep identical between this three, the 3rd remaining factor all will affect this macro-effect of velocity of rotation.
The life of lecture experiment is its intuitive.Current moment of inertia apparatus for demonstrating, due to the impact can only quality of presentation distributing on moment of inertia, can not be realized quality, the demonstration of these two factors of fixed rotating shaft position on moment of inertia impact.
Utility model content
In order to overcome defect and the deficiency of existing moment of inertia influence factor apparatus for demonstrating, the utility model provides a kind of solid moment of inertia influence factor demonstrator, can realize quality, mass distribution, the respectively demonstration of fixed rotating shaft position on solid moment of inertia impact.For realizing this purpose, this demonstrator has following formation: 3 identical disks, 2 vertical back shafts, 1 instrument base, 14 identical counterweights, 2 identical bearings.
The utility model adopted technical scheme of dealing with problems is: the disk that adopts 3 identical pmma materials to manufacture, 30 centimetres of disk diameters; On each disk, make the circle hole shape counterweight resettlement groove that 10 specifications are consistent, distribute consistent; At the mass axis of each disk with apart from a bearing draw-in groove of the each making of mass axis 10 centimeters; Disk border adopts gear teeth structure; The vertical back shaft of contour arranged parallel on horizontal base, 55 centimetres of diaxon standoff distances, settle respectively bearing in the upper end of 2 back shafts; Disk passes through bearing draw-in groove, and is connected with vertical back shaft by bearing.
Between the gear teeth that are fixed on two disks on vertical back shaft, placing a length is 50 centimetres of elastic steel sheets, slowly rotates in opposite directions this two disks, makes steel disc that certain deformation occur.When removing suddenly after the external force constraint that acts on disk, the steel disc that deformation occurs will provide an interior moment of couple to two disks.Now, each disk is under moment of resistance effect, and rotary state changes.By adjusting disk quantity, distribution, the rotating shaft position etc. of counterweight on disk, can realize the demonstration respectively that affects moment of inertia factor.
The beneficial effects of the utility model are: can intuitively distinguish quality of presentation, mass distribution, the impact of fixed rotating shaft position on solid moment of inertia.Apparatus structure is simple, be easy to make, but lecture experiment phenomenon is obvious, and the physical process of reflection is more directly perceived, clear, comprehensive, can deepen the understanding to moment of inertia influence factor.
The beneficial effects of the utility model are also: can deepen to becoming in moment of inertia situation the understanding of conservation of angular momentum phenomenon.
Brief description of the drawings
Fig. 1 is that two vertical back shafts of the present utility model are all by the design sketch of barycenter.
Fig. 2 is that of the present utility model vertical back shaft is by the design sketch of barycenter.
Fig. 3 is vertical view of the present utility model.
Fig. 4 is the longitudinal profile structural map that quality of presentation of the present utility model distributes on moment of inertia impact.
In Fig. 1: 1-organic glass disk, 2-disk gear teeth, 3-counterweight resettlement groove, 4-counterweight, 5-disk mass axis bearing draw-in groove, 6-bearing draw-in groove (bearing), 7-vertically back shaft, 8-elastic steel sheet, 9-base.
Embodiment
In order more clearly to describe technology contents of the present utility model, further describe below in conjunction with specific embodiment.
The utility model relates to a kind of apparatus for demonstrating of solid moment of inertia influence factor, can demonstrate respectively quality, mass distribution, the macro-effect of rotating shaft position on moment of inertia impact of rigid body.
In Fig. 1, on 3 identical organic glass disks, make identical, the strict unified circle hole shape counterweight resettlement groove of specification that distributes; Make respectively bearing draw-in groove at disk mass axis place with apart from mass axis 10 centimeters; The edge of disk is made into gear teeth structure.
In Fig. 1, the vertical back shaft of contour arranged parallel on horizontal base, 55 centimetres of diaxon standoff distances, settle respectively bearing in the upper end of 2 back shafts.
In Fig. 1, demonstration instrument structure is from top to bottom installed, respectively: organic glass disk (containing counterweight, bearing draw-in groove), bearing, vertical back shaft, base.Disk is installed together by bearing draw-in groove and the bearing being fixed on vertical back shaft, realizes disk and the vertically installation of back shaft.
In Fig. 1, between the gear teeth that are fixed on 2 disks on vertical back shaft, placing a length is 50 centimetres of elastic steel sheets, slowly rotates in opposite directions this two disks, makes steel disc that certain deformation occur.
The utility model is realized the operating process of the demonstration of quality, mass distribution, the impact of fixed rotating shaft position on solid moment of inertia:
(1) in Fig. 1, there is no fixing disk by the 3rd, be placed in top for fixed disc, ensure that the counterweight resettlement groove circular hole of these two disks is corresponding one by one.In the counterweight resettlement groove of the disk of settling, put into respectively 7 counterweights on two vertical back shafts, keep counterweight position distribution in full accord.Between the gear teeth that are fixed on two disks on vertical back shaft, placing a length is 50 centimetres of elastic steel sheets, under external force effect of contraction, slowly rotates in opposite directions this two disks, makes steel disc that certain deformation occur.Then remove suddenly external force constraint, now these two disks (two disks on one of them axle are consolidated and are equivalent to a disk by counterweight), are subject to the identical moment of resistance effect of size, by opposite direction rotate.But, the disk entirety that two disks that are consolidated form, its quality is greater than the disk on another vertical back shaft, and therefore both rotate the macro-effect difference of speed.According to the law of rotation of rigid body fixed-axis rotation, velocity of rotation is slower, and moment of inertia is larger, realizes the demonstration of quality on moment of inertia impact.
(2) in Fig. 2, in two disks that are fixed on vertical back shaft, place respectively the counterweight of equivalent, ensure that the position distribution of the relative disk of counterweight on two disks is identical.Between the gear teeth of two disks, place elastic steel sheet, under external force effect of contraction, slowly rotate in opposite directions this two disks, make steel disc that certain deformation occur, and guarantee effect is in the moment of resistance equal and opposite in direction of these two disks.When removing after external force constraint suddenly, these two disks are due to the position difference of the relative disk of vertical back shaft, and in the time that suffered moment of resistance size is identical, both rotate the macro-effect difference of speed, and vertically back shaft is very fast by the disk velocity of rotation of barycenter.According to law of rotation, the rigid body that moment of inertia is little, under identical moment loading, velocity of rotation is very fast, has realized the demonstration of rotating shaft position on moment of inertia impact.
(3) in Fig. 1, in two disks that have been arranged on vertical back shaft, place respectively the counterweight of equivalent, but counterweight position distribution difference, the paraxial arrangement of counterweight on one of them disk, the counterweight circumference on another disk is settled.Between the gear teeth of these two disks, place elastic steel sheet, under external force effect of contraction, slowly rotate in opposite directions this two disks, make steel disc that certain deformation occur.Then remove suddenly external force constraint, now these two disks are subject to the identical moment of resistance effect of size, by opposite direction rotate, but axle far away settles the disk velocity of rotation of counterweight slower.According to law of rotation, the rigid body that moment of inertia is large, under identical moment loading, velocity of rotation is slower, has realized the demonstration of mass distribution on moment of inertia impact.
Above in described three kinds of situations, and (2) macroscopic appearance of showing (1), be actually the apparent image of angular momentum conservation law in two kinds of concrete situations, therefore this demonstrator also can be deepened becoming in moment of inertia situation, the understanding of conservation of angular momentum phenomenon.
Claims (2)
1. a solid moment of inertia influence factor demonstrator, is characterized in that, the disk that adopts 3 identical pmma materials to manufacture, 30 centimetres of disk diameters; On each disk, make the circle hole shape counterweight resettlement groove that 10 specifications are consistent, distribute consistent; At the mass axis of each disk with apart from a bearing draw-in groove of the each making of mass axis 10 centimeters; Disk border adopts gear teeth structure; The vertical back shaft of contour arranged parallel on horizontal base, 55 centimetres of diaxon standoff distances, settle respectively bearing in the upper end of 2 back shafts; Disk passes through bearing draw-in groove, and is connected with vertical back shaft by bearing.
2. solid moment of inertia influence factor demonstrator according to claim 1, is characterized in that, between the gear teeth that are fixed on 2 disks on vertical back shaft, placing a length is 50 centimetres of elastic steel sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420059416.6U CN203786971U (en) | 2014-02-09 | 2014-02-09 | Rigid body rotational inertia influencing factor demonstration instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420059416.6U CN203786971U (en) | 2014-02-09 | 2014-02-09 | Rigid body rotational inertia influencing factor demonstration instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203786971U true CN203786971U (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420059416.6U Expired - Fee Related CN203786971U (en) | 2014-02-09 | 2014-02-09 | Rigid body rotational inertia influencing factor demonstration instrument |
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| Country | Link |
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| CN (1) | CN203786971U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104361792A (en) * | 2014-11-10 | 2015-02-18 | 皖西学院 | Rotational inertia measuring device |
| CN106872103A (en) * | 2017-03-23 | 2017-06-20 | 重庆科技学院 | Processional moment measuring device and assay method |
| CN107749220A (en) * | 2017-12-01 | 2018-03-02 | 合肥探奥自动化有限公司 | A kind of rotary inertia contrasts apparatus for demonstrating |
| CN114822179A (en) * | 2022-04-14 | 2022-07-29 | 江汉大学 | Rotational inertia demonstration instrument |
| CN116543626A (en) * | 2023-07-03 | 2023-08-04 | 戎妙秋 | A popular science demonstration device for the moment of inertia of a rotating body |
-
2014
- 2014-02-09 CN CN201420059416.6U patent/CN203786971U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104361792A (en) * | 2014-11-10 | 2015-02-18 | 皖西学院 | Rotational inertia measuring device |
| CN106872103A (en) * | 2017-03-23 | 2017-06-20 | 重庆科技学院 | Processional moment measuring device and assay method |
| CN107749220A (en) * | 2017-12-01 | 2018-03-02 | 合肥探奥自动化有限公司 | A kind of rotary inertia contrasts apparatus for demonstrating |
| CN114822179A (en) * | 2022-04-14 | 2022-07-29 | 江汉大学 | Rotational inertia demonstration instrument |
| CN116543626A (en) * | 2023-07-03 | 2023-08-04 | 戎妙秋 | A popular science demonstration device for the moment of inertia of a rotating body |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20160209 |
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| CF01 | Termination of patent right due to non-payment of annual fee |