CN202049644U - Forced vibration demonstration device - Google Patents
Forced vibration demonstration device Download PDFInfo
- Publication number
- CN202049644U CN202049644U CN2011200259817U CN201120025981U CN202049644U CN 202049644 U CN202049644 U CN 202049644U CN 2011200259817 U CN2011200259817 U CN 2011200259817U CN 201120025981 U CN201120025981 U CN 201120025981U CN 202049644 U CN202049644 U CN 202049644U
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- cantilever beam
- forced vibration
- vibration
- pressing plate
- semi
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A forced vibration demonstration device is provided. A supporting plate (1) for fixing a cantilever beam (3) is arranged on a workbench, the cantilever beam (3) with a rectangular cross section is clamped tightly by a pressing plate (2), the elasticity of the cantilever beam should be good, the length of the extending end of the cantilever beam can be adjusted through the pressing plate, the cantilever beam can also be replaced with beams with different rigidity, quality and shapes, and the position of a vibration exciter can also be changed to suit measurement in different situations. When in work, a sensor (6), the vibration exciter (7) and other test instruments, such as a charge amplifier, an oscilloscope, a digital voltmeter, a power amplifier, and a signal generator are assembled according to Figure 2, and the demonstration result is observed by the oscilloscope.
Description
Technical field
The utility model relates to a kind of physics facility, particularly a kind of apparatus for demonstrating that is used for the semi-girder forced vibration.
Background technology
Mechanical vibration are important contents of physics research, but in teaching, there are two problems: the one, some of them notion, theory are more abstract, beyond one's depth, student's study acquires a certain degree of difficulty, the 2nd, research is the single-degree of freedom vibration system in the teaching, and the oscillation phenomenon that arrives seen in the actual production, life all belongs to the multi-freedom-degree vibration system, and the two has a long way to go.More existing vibration experiment instrument generally can only be done simple lecture experiment under extremely low frequency, effect is relatively poor and the actual machine vibration is too wide in the gap, can't see vibrational waveform.This Experiment of forced vibration device can directly be seen vibrational waveform, finishes the forced vibration lecture experiment.
The utility model content
The purpose of this utility model provides a kind of physics facility, and the Direct observation vibrational waveform is finished the forced vibration lecture experiment.
The purpose of this utility model is achieved in that on worktable 5 shown in Figure 1, fixed support plate 1, by pressing plate 2 clamp rectangular cross section semi-girders 3, sensor installation 6 on the semi-girder 3, by vibrator to the semi-girder exciting.On worktable 5, be provided with vibrator mounting hole 4.Semi-girder elasticity will be got well, and the length of external part can be regulated by pressing plate, also can change different-stiffness, quality and difform beam, and the vibrator position also can change, to adapt to the measurement of different situations.During work, press Fig. 2 sensor installation 6 (GIA type piezoelectric acceleration transducer, measurement range 11g～25g, frequency range 15Hz～500Hz), vibrator 7 and other testing tool such as charge amplifier, oscillograph, digital voltmeter, power amplifier, signal generator etc., demonstration is the result observed by oscillograph.
Description of drawings
Fig. 1 is the forced vibration worktable.
Fig. 2 is a forced vibration pilot system circuit diagram.
1, back up pad, 2, pressing plate, 3, semi-girder, 4, the vibrator mounting hole, 5, worktable, 6, sensor, 7, vibrator.
Embodiment
At first connect experimental circuit, and debug to normal operating conditions by Fig. 2
(1) the checking forcing frequency is identical with hormetic frequency.
Signal voltage input oscillographic " Y input " terminal with forced vibration, and the given frequency signal of another signal generator is imported oscillograph " outer X " terminal, then according to the lissajouf figure ratio and the known signal frequency that show, can calculate the frequency numerical value of forced vibration, be forced frequency.
(2) resonance effect of observation distribution parameter vibrational system.
Has only one for the single-degree of freedom vibration system because of its natural frequency, so its amplitude versus frequency characte has only a maximum value.For many-degrees of freedom system, promptly distributed parameter system has a plurality of natural frequencys in theory, so resonant frequency also has many.When excited frequency is raise gradually, can see several times that semi-girder produces fierce displacement resonance.The formant waveform of observing signal voltage from oscillograph has shown as a plurality of peak values in amplitude-versus-frequency curve, this is the vibration situation of general actual vibration system.Attention: this worktable requires base and back up pad that enough stability and rigidity will be arranged.
Claims (1)
1. forced vibration apparatus for demonstrating is characterized in that: fixed support plate on worktable, by pressing plate clamp rectangular cross section semi-girder, on worktable, be provided with the vibrator mounting hole, sensor installation on the semi-girder, by vibrator to the semi-girder exciting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200259817U CN202049644U (en) | 2011-01-27 | 2011-01-27 | Forced vibration demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200259817U CN202049644U (en) | 2011-01-27 | 2011-01-27 | Forced vibration demonstration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202049644U true CN202049644U (en) | 2011-11-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200259817U Expired - Fee Related CN202049644U (en) | 2011-01-27 | 2011-01-27 | Forced vibration demonstration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202049644U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134583A (en) * | 2011-11-29 | 2013-06-05 | 成都凯天电子股份有限公司 | Method for testing vibration acceleration of sensor at 100g or above |
| CN106530910A (en) * | 2016-12-12 | 2017-03-22 | 段懿宸 | Resonance-principle-based fatigue damage identification demonstration experiment instrument |
| CN106781895A (en) * | 2017-01-09 | 2017-05-31 | 河南科技学院 | A kind of physical experiment table of intrinsic frequency |
| CN110057516A (en) * | 2019-03-25 | 2019-07-26 | 沙洲职业工学院 | A kind of slender rod piece elastic stiffness test device |
| CN112309208A (en) * | 2020-11-17 | 2021-02-02 | 西安理工大学 | Single-degree-of-freedom vibration and resonance demonstration teaching aid |
-
2011
- 2011-01-27 CN CN2011200259817U patent/CN202049644U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134583A (en) * | 2011-11-29 | 2013-06-05 | 成都凯天电子股份有限公司 | Method for testing vibration acceleration of sensor at 100g or above |
| CN106530910A (en) * | 2016-12-12 | 2017-03-22 | 段懿宸 | Resonance-principle-based fatigue damage identification demonstration experiment instrument |
| CN106530910B (en) * | 2016-12-12 | 2019-02-19 | 段懿宸 | Fatigue damage based on resonance principle identifies demonstration test instrument |
| CN106781895A (en) * | 2017-01-09 | 2017-05-31 | 河南科技学院 | A kind of physical experiment table of intrinsic frequency |
| CN110057516A (en) * | 2019-03-25 | 2019-07-26 | 沙洲职业工学院 | A kind of slender rod piece elastic stiffness test device |
| CN112309208A (en) * | 2020-11-17 | 2021-02-02 | 西安理工大学 | Single-degree-of-freedom vibration and resonance demonstration teaching aid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20120127 |