CN102981050A - Single vibration frequency measuring method - Google Patents
Single vibration frequency measuring method Download PDFInfo
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- CN102981050A CN102981050A CN2012104887301A CN201210488730A CN102981050A CN 102981050 A CN102981050 A CN 102981050A CN 2012104887301 A CN2012104887301 A CN 2012104887301A CN 201210488730 A CN201210488730 A CN 201210488730A CN 102981050 A CN102981050 A CN 102981050A
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- vibration frequency
- operational amplifier
- single vibration
- resistance
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Abstract
The invention discloses a signal vibration frequency measuring method which includes an operational amplifier A1, an input resistor R1, a feedback resistor R2, a feedback capacitor C and a feedback inductor L. The single vibration frequency measuring method is used for on-line measuring of mechanical vibration frequency in the power generation industry and has the advantages of being high in accuracy and low in cost.
Description
Technical field
The invention belongs to power industry mechanical vibration frequency measurement field, particularly a kind of single vibration frequency measurement method.
Background technology
The vibration that produces in the plant equipment work can produce certain impact to its normal operation.In the prior art, measurement for the mechanical vibration frequency is not very desirable, therefore sensor must be installed on the measured parts that are in the work, sensor output has the defectives such as signal is little, noise is large, how sensor signal is optimized disposal route, is the key that vibration frequency is measured.
Summary of the invention
Order of the present invention is to provide a kind of single vibration frequency measurement method.
The technical scheme that realizes above-mentioned purpose is: a kind of single vibration frequency measurement method, it comprises operational amplifier A 1, input resistance R1, feedback resistance R2, feedback capacity C and feedback inductance L.
Above-mentioned a kind of single vibration frequency measurement method, wherein: the positive input end grounding of described operational amplifier A 1, be in series with described input resistance R1 between inverting input and the detected voltage signal fin, be in series with described feedback resistance R2, feedback capacity C and feedback inductance L between inverting input and the described operational amplifier A 1 Ausgang out.
Above-mentioned a kind of single vibration frequency measurement method, wherein: described operational amplifier A 1 is Low Drift Temperature type operational amplifier.
Above-mentioned a kind of single vibration frequency measurement method, wherein: described feedback resistance R2, feedback capacity C and feedback inductance L form frequency selection network.
Above-mentioned a kind of single vibration frequency measurement method, wherein: when the measured signal frequency f satisfied f^2=L*C, it is maximum that gain reaches.
The invention has the beneficial effects as follows: be used for the on-line measurement of power industry machinery power industry mechanical vibration frequency, have precision height, advantage that cost is low.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1, provided a kind of single vibration frequency measurement method among the figure, it comprises operational amplifier A 1, input resistance R1, feedback resistance R2, feedback capacity C and feedback inductance L.
The positive input end grounding of operational amplifier A 1, be in series with described input resistance R1 between inverting input and the detected voltage signal fin, be in series with described feedback resistance R2, feedback capacity C and feedback inductance L between inverting input and the described operational amplifier A 1 Ausgang out.
Operational amplifier A 1 is Low Drift Temperature type operational amplifier.
If the measured signal frequency is f, the capacitive reactance of feedback capacity C is:
Zc=1/ (2 π fC) formula 1
The induction reactance of feedback inductance L is:
Zl=2 π fL formula 2
The impedance of backfeed loop is:
Zf=R2+2 π fL+1/ (2 π fC) formula 3
Operational amplifier normal phase input end and anti-phase input terminal potential equate that electric current is 0, then has:
Fin/R1=-fout/Zf formula 4
Formula 3 substitution formula 4 are obtained:
Fout=-[R2+2fL+1/ (2 π fC)] * fin formula 5
Can set up the relation of output gain and measured signal frequency, f by formula 5
2During=L/C, the output gain of tested frequency signal is maximum.
In the present embodiment, operational amplifier A 1 is LM064, and resistance R 1 resistance is 10K, and resistance R 2 resistances are 100K.
Principle of the present invention is: utilize resonance principle, obtain operational amplifier by the maximum feedback impedance loop on the measured frequency, the on-line sampling real time data has guaranteed real-time, stability and the accuracy of power industry mechanical vibration frequency measurements.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not consist of limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (4)
1. single vibration frequency measurement method, it comprises operational amplifier A 1, input resistance R1, feedback resistance R2, feedback capacity C and feedback inductance L, wherein:
The positive input end grounding of described operational amplifier A 1, be in series with described input resistance R1 between inverting input and the detected voltage signal fin, be in series with described feedback resistance R2, feedback capacity C and feedback inductance L between inverting input and the described operational amplifier A 1 Ausgang out.
2. described a kind of single vibration frequency measurement method according to claim 1 is characterized in that described operational amplifier A 1 is Low Drift Temperature type operational amplifier.
3. described a kind of single vibration frequency measurement method according to claim 1 is characterized in that, described feedback resistance R2, feedback capacity C and feedback inductance L form frequency selection network.
4. described a kind of single vibration frequency measurement method according to claim 1 is characterized in that, when the measured signal frequency f satisfied f^2=L*C, it is maximum that gain reaches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012104887301A CN102981050A (en) | 2012-11-26 | 2012-11-26 | Single vibration frequency measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104887301A CN102981050A (en) | 2012-11-26 | 2012-11-26 | Single vibration frequency measuring method |
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| CN102981050A true CN102981050A (en) | 2013-03-20 |
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| CN2012104887301A Pending CN102981050A (en) | 2012-11-26 | 2012-11-26 | Single vibration frequency measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986670A (en) * | 2021-02-07 | 2021-06-18 | 石家庄通合电子科技股份有限公司 | Power device parameter measuring circuit and power device parameter measuring method |
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| JP2005503064A (en) * | 2001-09-13 | 2005-01-27 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Active tunable filter circuit |
| CN1877655A (en) * | 2006-07-17 | 2006-12-13 | 上海开聪文化传播有限公司 | Intelligent prompt device for water boiling |
| CN101350592A (en) * | 2008-07-11 | 2009-01-21 | 东南大学 | Ultra-wideband low noise amplifier |
| US20110159835A1 (en) * | 2009-12-30 | 2011-06-30 | Quintic Holdings | Crystal-less clock generation for radio frequency receivers |
| CN201957317U (en) * | 2011-04-03 | 2011-08-31 | 阮树成 | High-pressure sodium lamp with direct-current low-voltage power supply and bridge oscillator |
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2012
- 2012-11-26 CN CN2012104887301A patent/CN102981050A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005503064A (en) * | 2001-09-13 | 2005-01-27 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Active tunable filter circuit |
| CN1877655A (en) * | 2006-07-17 | 2006-12-13 | 上海开聪文化传播有限公司 | Intelligent prompt device for water boiling |
| CN101350592A (en) * | 2008-07-11 | 2009-01-21 | 东南大学 | Ultra-wideband low noise amplifier |
| US20110159835A1 (en) * | 2009-12-30 | 2011-06-30 | Quintic Holdings | Crystal-less clock generation for radio frequency receivers |
| CN201957317U (en) * | 2011-04-03 | 2011-08-31 | 阮树成 | High-pressure sodium lamp with direct-current low-voltage power supply and bridge oscillator |
Non-Patent Citations (3)
| Title |
|---|
| 唐金元 等: "基于Multisim 10.0的选频放大电路传输特性仿真研究", 《应用天地》, vol. 31, no. 10, 31 October 2012 (2012-10-31) * |
| 崔智军: "一种磁通门传感器的选频放大电路设计", 《信息与电子工程》, vol. 10, no. 2, 30 April 2012 (2012-04-30) * |
| 杨杰: "高频小信号谐振放大器的MATLAB仿真", 《电脑与信息技术》, vol. 20, no. 4, 31 August 2012 (2012-08-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986670A (en) * | 2021-02-07 | 2021-06-18 | 石家庄通合电子科技股份有限公司 | Power device parameter measuring circuit and power device parameter measuring method |
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Application publication date: 20130320 |