CN102446444A - Sinusoidal curve demonstration instrument - Google Patents
Sinusoidal curve demonstration instrument Download PDFInfo
- Publication number
- CN102446444A CN102446444A CN2010105003012A CN201010500301A CN102446444A CN 102446444 A CN102446444 A CN 102446444A CN 2010105003012 A CN2010105003012 A CN 2010105003012A CN 201010500301 A CN201010500301 A CN 201010500301A CN 102446444 A CN102446444 A CN 102446444A
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- CN
- China
- Prior art keywords
- sinusoidal curve
- linkage rod
- cross beam
- crossbeam
- screw bolt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention relates to a senior high school mathematical teaching instrument for demonstrating the definition of a sinusoidal curve. The instrument is characterized in that a small hole is respectively drilled at each of two ends of a cross beam; a long screw bolt is inserted into the circle centre of a circular plate and passes through the cross beam; then two gears, one of which is smaller than the other, are arranged on the screw bolt; the gears and the circular plate are fixed on the screw bolt through screw caps, the screw bolt can rotate in the cross beam; an upright slot is vertically fixed at the center of the cross beam; the bottom of a linkage rod of a transverse slot is hollowed out; both ends of the linkage rod are connected with the edge of a disc through screw bolts; the two connection point and two circle centers form a parallelogram, so that when the disc rotates, the linkage rod of the transverse slot can move up and down with the rotation of the disc; the distances between the linkage rod of the transverse slot and the circle centers are regulated, so that the amplitude of the sinusoidal curve can be changed; and a drawing pen is mounted in the linkage rod of the transverse slot and the upright slot. By controlling the drawing pen through two-wheel linkage, the theory of the sinusoidal curve is demonstrated, and the amplitude and cycle of the curve can be regulated; and the relation between the amplitude and phase of the sinusoidal curve is clearly shown, thus students can more easily understand the definition of the sinusoidal curve.
Description
Technical field
The invention belongs to a kind of high school mathematics teaching instrument that can demonstrate the sinusoidal curve definition.
Background technology
Sinusoidal curve is the important content in the high school mathematics teaching, but does not also have a kind of high school mathematics teaching instrument that can demonstrate the sinusoidal curve definition at present.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of high school mathematics teaching instrument that can demonstrate the sinusoidal curve definition.
The technical scheme that the present invention adopted is following: an aperture is respectively bored at the two ends of crossbeam, insert a long bolt to the center of circle of plectane, and pass crossbeam; Two gears with small one and large one are through on the screw rod again, and on nut screw rod that gear and plectane is fixing, screw rod can rotate in crossbeam; With upright groove fixedly intermediate vertical in the centre of crossbeam; The bottom of translot gangbar is hollowed out, and two ends are connected with the edge of disk with screw rod, and these two interfaces and two centers of circle form parallelogram; In the time of can guaranteeing that disk rotates, the translot gangbar can move up and down thereupon; Regulate the distance of translot gangbar, can change sinusoidal amplitude to the center of circle; Paintbrush is contained among translot gangbar and the upright groove.
Rack-track is installed in the drawing board lower end, when the gear of different radii moves in the above, the sinusoidal cycle of scalable.
The two-wheeled mode of controlling paintbrush that links is showed sinusoidal principle, and amplitude and cycle that can adjustment curve;
Beneficial effect of the present invention: can know the relation of sinusoidal curve amplitude and phase place, make the student be more readily understood sinusoidal definition.
Description of drawings
Fig. 1 sinusoidal curve demonstrator structure synoptic diagram.
In Fig. 1,1. rack-track, 2. gear wheel, 3 pinion wheels, 4. crossbeam, 5. paintbrush.6. upright groove, 7. translot gangbar, 8. drawing board.
Embodiment
Below in conjunction with accompanying drawing and an embodiment the present invention is described further.
As shown in the figure, gear wheel (2) and pinion wheel (3) are installed in the two ends of crossbeam (4), and pass crossbeam (4); With on nut the screw rod that gear wheel (2) and pinion wheel (3) is fixing, screw rod can rotate in crossbeam (4) again; To found groove (6) and be vertically fixed on the centre of crossbeam (4); The bottom of translot gangbar (7) is hollowed out, and two ends are connected with the edge of screw rod with gear wheel (2), and these two interfaces and two centers of circle form parallelogram; In the time of can guaranteeing that disk rotates, translot gangbar (7) can move up and down thereupon; Paintbrush (5) is contained among translot gangbar (7) and the upright groove (6).Rack-track (1) is installed on the drawing board (8).
Claims (1)
1. can demonstrate the high school mathematics teaching instrument that sinusoidal curve defines for one kind, it is characterized in that: gear wheel (2) and pinion wheel (3) are installed in the two ends of crossbeam (4), and pass crossbeam (4); With on nut the screw rod that gear wheel (2) and pinion wheel (3) is fixing, screw rod can rotate in crossbeam (4) again; To found groove (6) and be vertically fixed on the centre of crossbeam (4); The bottom of translot gangbar (7) is hollowed out, and two ends are connected with the edge of screw rod with gear wheel (2), and these two interfaces and two centers of circle form parallelogram; In the time of can guaranteeing that disk rotates, translot gangbar (7) can move up and down thereupon; Paintbrush (5) is contained among translot gangbar (7) and the upright groove (6).Rack-track (1) is installed on the drawing board (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105003012A CN102446444A (en) | 2010-10-08 | 2010-10-08 | Sinusoidal curve demonstration instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105003012A CN102446444A (en) | 2010-10-08 | 2010-10-08 | Sinusoidal curve demonstration instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102446444A true CN102446444A (en) | 2012-05-09 |
Family
ID=46008913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105003012A Pending CN102446444A (en) | 2010-10-08 | 2010-10-08 | Sinusoidal curve demonstration instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102446444A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104318823A (en) * | 2014-11-25 | 2015-01-28 | 南京工业职业技术学院 | Arcsine and arccosine function demonstrating and image drawing instrument |
| CN104835383A (en) * | 2015-05-08 | 2015-08-12 | 福州大学 | Demonstration mechanism for solving arc envelop and demonstration method thereof |
-
2010
- 2010-10-08 CN CN2010105003012A patent/CN102446444A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104318823A (en) * | 2014-11-25 | 2015-01-28 | 南京工业职业技术学院 | Arcsine and arccosine function demonstrating and image drawing instrument |
| CN104835383A (en) * | 2015-05-08 | 2015-08-12 | 福州大学 | Demonstration mechanism for solving arc envelop and demonstration method thereof |
| CN104835383B (en) * | 2015-05-08 | 2017-06-06 | 福州大学 | A kind of demonstration mechanism for solving arc envelope line and its demenstration method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120509 |