CN102519575B - True RMS vibration intensity two wire transmitter - Google Patents
True RMS vibration intensity two wire transmitter Download PDFInfo
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Abstract
The invention discloses a true RMS vibration intensity two wire transmitter. A circuit comprises: an amplification circuit and a root mean square value converting circuit. The root mean square value circuit comprises: an absolute value circuit, a power division circuit and a filtering circuit. A signal input terminal of the absolute value circuit is connected with a signal output terminal of a vibration speed sensor. The signal output terminal of the absolute value circuit is connected with the signal input terminal of the power division circuit. The signal output terminal of the power division circuit is connected with the signal input terminal of the filtering circuit. The signal output terminal of the filtering circuit is connected with the signal input terminal of the amplification circuit. The circuit of the invention is simple, and under a low power consumption requirement, accuracy conversion of the true RMS of a complex alternating signal can be realized.
Description
Technical field
The present invention relates to a kind of transmitter, particularly relate to a kind of real effective vibration severity two-wire system transformer, belong to the electric automatization field.
Background technology
In industry spot various machinery and equipment are arranged, for guaranteeing the long-time reliable and stable operation of these equipment, need a lot of status monitoring instrument that the key position of these equipment is monitored in real time.Simultaneously, the measurement data of various measuring instruments need be shared with the system of control center.Utilizing 4～20mA electric current or 0-10V, 1～5V voltage is the mode that the modal a kind of Monitoring Data of present industry spot is shared.In computer automatic measurement and control system, usually various physical quantitys such as temperature, pressure, flow are become and meet industrial standard 4～20mA current signal.Along with the development of microcontroller technology, occurred meeting the low power-consumption intelligent type equipment that this industrial standard does not use the additional power supply power supply, be known as intelligent two-wire system equipment.The vibration severity two-wire system transformer is exactly a kind of intelligent two-wire system equipment.
The vibration severity two-wire system transformer is commonly used to monitor the operating vibration severities of rotating machinery such as turbine, generator, fan blower.Vibration severity is the root-mean-square value of vibration velocity, this index has directly reflected the energy size of vibration, more can adapt to machine vibration evaluation under the different rotating speeds than the vibration displacement amplitude, progressively substitute the vibration displacement amplitude of traditional habit as the principal character amount of machine vibration monitoring in a lot of fields.
In actual use, the vibration two-wire system transformer does not have the two-wire system transformer of temperature, pressure one class effective, subject matter is that the power supply of two-wire system transformer self is two leads with 4-20mA electric current loop line sharing, this point has just determined that the basic power consumption of two-wire system transformer must be little, and the base current of keeping self-operating must be less than 4mA.The two-wire system transformer technology is used in the vibration monitoring field, then different with the transmitter of temperature, pressure class, need to solve more problem.Vibration severity is defined as the root-mean-square value of vibration velocity, need change accurately by circuit polarities, and the limit value of power supply power consumption, makes the circuit can not be complicated.Some products have carried out approximate processing to vibration signal, caused in the actual use can not accurate transformation to complex vibration signals slightly problem.
In the product of two-wire system transformer class, transmitters such as temperature, pressure are because the physical quantity of monitoring is gradual process variable, and disposal route is simple, has been the technology of comparative maturity.Then there are some problems in the vibration severity monitoring:
1, the alternating signal of waveform complexity during vibration signal may be the sinusoidal waveform of single-frequency, also may be the complicated wave form that contains multiple frequency component, draw the authentic and valid value of these signals, and the circuit of more complicated must be arranged.
2, two-wire system transformer is because the restriction of characteristics of power supply, for the design of real effective circuit brings a lot of difficulty, so a lot of vibration severity two-wire system transformers are not the speed effective values truly that reflects in the market, but done some approximate processing, cause bigger error when under complicated wave form, using.
Summary of the invention
The objective of the invention is provides a kind of circuit simple in order to address the above problem, and can realize the real effective vibration severity two-wire system transformer to the accurate conversion of complicated alternating signal real effective under low-power consumption requires.
The present invention is achieved by the following technical solutions:
A kind of real effective vibration severity two-wire system transformer, its circuit comprises amplifying circuit and root-mean-square value change-over circuit, described root-mean-square value circuit comprises absolute value circuit, power division circuit and filtering circuit, the signal input part of described absolute value circuit is connected with the signal output part of vibrating speed sensors, the signal output part of described absolute value circuit is connected with the signal input part of described power division circuit, the signal output part of described power division circuit is connected with the signal input part of described filtering circuit, and the signal output part of described filtering circuit is connected with the signal input part of described amplifying circuit.
Described absolute value circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first diode VD1, the second diode VD2 and the first amplifier A1, first end of described first resistance R 1 is the signal input part of described absolute value circuit, second end of described first resistance R 1 is connected with the electrode input end of the described first amplifier A1, the negative input ground connection of the described first amplifier A1, the output terminal of the described first amplifier A1 is connected with the negative pole of the described first diode VD1 and the positive pole of the described second diode VD2 simultaneously, the anodal of the described first diode VD1 is connected with the electrode input end of the described first amplifier A1 and an end of described second resistance R 2 simultaneously, the other end of described second resistance R 2 is connected with the negative pole of the described second diode VD2 and first end of described the 3rd resistance R 3 simultaneously, the two ends of described the 4th resistance R 4 are connected with first end of first resistance R 1 and second end of described the 3rd resistance R 3 respectively, and second end of described the 3rd resistance R 3 is the signal output part of described absolute value circuit.
Described power division circuit comprises the second amplifier A2, the 3rd amplifier A3, the first transistor VT1, transistor seconds VT2, the 3rd transistor VT3 and the 4th transistor VT4, the electrode input end of the described second amplifier A2 is the signal input part of described power division circuit, the electrode input end of the described second amplifier A2 is connected with second end of described the 3rd resistance R 3 and the collector of the first transistor VT1 simultaneously, the negative input ground connection of the described second amplifier A2, the output terminal of the described second amplifier A2 is connected with the emitter of transistor seconds VT2 and the emitter of the 3rd transistor VT3 simultaneously, the base stage of described transistor seconds VT3 is connected with the collector of described transistor seconds VT2 and the emitter of described the first transistor VT1 simultaneously, the base earth of described the first transistor VT1, the base stage of described the 3rd transistor VT3 is connected with the output terminal of described the 3rd amplifier A3 and the emitter of described the 4th transistor VT4 simultaneously, the negative input of described the 3rd amplifier A3 is connected with the collector of described the 4th transistor VT4, the base earth of described the 4th transistor VT4, the electrode input end ground connection of described the 3rd amplifier A3, the current collection of described the 3rd transistor VT3 is the signal output part of power division circuit very.Described filtering circuit comprises the 4th amplifier A4, the 5th resistance R 5 and capacitor C, the negative input of described the 4th amplifier A4 is the signal input part of described filtering circuit, the negative input of described the 4th amplifier A4 is connected with the collector of described the 3rd transistor VT3, the electrode input end of described the 4th amplifier A4 is connected back ground connection with the electrode input end of described the 3rd amplifier A3, its two ends are connected with the negative input of described the 4th amplifier A4 and the output terminal of the 4th amplifier A4 respectively after described the 5th resistance R 5 and the described capacitor C parallel connection, be connected with the 6th resistance R 6 between the negative input of the output terminal of described the 4th amplifier A4 and described the 3rd amplifier A3, the output terminal of described the 4th amplifier A4 is the signal output part of described filtering circuit.
Further, described second resistance R 2 is identical with the resistance of described the 3rd resistance R 3, the resistance of described first resistance R 1 is the twice of described second resistance R 2, and the resistance of described the 4th resistance R 4, described the 5th resistance R 5 and described the 6th resistance R 6 is four times of described second resistance R 2.
A nearlyer step ground, described the first transistor VT1, transistor seconds VT2, the 3rd transistor VT3 and the 4th transistor VT4 are NPN transistor.
The invention has the beneficial effects as follows:
The present invention adopts technique scheme, has the following advantages: (1) can realize the accurate conversion to complicated alternating signal real effective; (2) basic power consumption is little, and the basic static current of lcd of each several part circuit is less than 4mA; (3) circuit is simple, cost is low.
Description of drawings
Fig. 1 is circuit diagram of the present invention;
Fig. 2 is the circuit diagram of root-mean-square value circuit of the present invention;
Fig. 3 is the corresponding relation figure of linearity test current output of the present invention and input signal.
Embodiment
The present invention is described in further detail below in conjunction with drawings and the specific embodiments:
As depicted in figs. 1 and 2, a kind of real effective vibration severity of the present invention two-wire system transformer, its circuit comprises amplifying circuit and root-mean-square value change-over circuit, the signal input part of described root-mean-square value change-over circuit is connected with the signal output part of vibrating speed sensors, the voltage shape ripple of vibrating speed sensors output reflection vibration velocity, be input in the root-mean-square value change-over circuit, be converted to the DC voltage output signal of equivalence; The signal output part of described root-mean-square value change-over circuit is connected with the signal input part of described amplifying circuit, and described amplifying circuit is applied on the outside after the d. c. voltage signal process of root-mean-square value circuit output is suitably amplified, and is converted to current signal.
Described root-mean-square value circuit comprises absolute value circuit, power division circuit and filtering circuit.The signal output part of described absolute value circuit is connected with the signal input part of described power division circuit, and the signal output part of described power division circuit is connected with the signal input part of described filtering circuit.
Described absolute value circuit comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the first diode VD1, the second diode VD2 and the first amplifier A1, first end of described first resistance R 1 be connected with the signal output part of vibrating speed sensors, second end of described first resistance R 1 is connected with the electrode input end of the described first amplifier A1, the negative input ground connection of the described first amplifier A1, the output terminal of the described first amplifier A1 is connected with the negative pole of the described first diode VD1 and the positive pole of the described second diode VD2 simultaneously, the anodal of the described first diode VD1 is connected with the electrode input end of the described first amplifier A1 and an end of described second resistance R 2 simultaneously, the other end of described second resistance R 2 is connected with the negative pole of the described second diode VD2 and first end of described the 3rd resistance R 3 simultaneously, and the two ends of described the 4th resistance R 4 are connected with first end of first resistance R 1 and second end of described the 3rd resistance R 3 respectively.
Described power division circuit comprises the second amplifier A2, the 3rd amplifier A3, the first transistor VT1, transistor seconds VT2, the 3rd transistor VT3 and the 4th transistor VT4, the electrode input end of the described second amplifier A2 is connected with second end of described the 3rd resistance R 3 and the collector of the first transistor VT1 simultaneously, the negative input ground connection of the described second amplifier A2, the output terminal of the described second amplifier A2 is connected with the emitter of transistor seconds VT2 and the emitter of the 3rd transistor VT3 simultaneously, the base stage of described transistor seconds VT3 is connected with the collector of described transistor seconds VT2 and the emitter of described the first transistor VT1 simultaneously, the base earth of described the first transistor VT1, the base stage of described the 3rd transistor VT3 is connected with the output terminal of described the 3rd amplifier A3 and the emitter of described the 4th transistor VT4 simultaneously, the negative input of described the 3rd amplifier A3 is connected with the collector of described the 4th transistor VT4, the base earth of described the 4th transistor VT4, the electrode input end ground connection of described the 3rd amplifier A3.
Described filtering circuit comprises the 4th amplifier A4, the 5th resistance R 5 and capacitor C, the electrode input end of described the 4th amplifier A4 is connected with the electrode input end of described the 3rd amplifier A3, the negative input of described the 4th amplifier A4 is connected with the collector of described the 3rd transistor VT3, its two ends are connected with the negative input of described the 4th amplifier A4 and the output terminal of the 4th amplifier A4 respectively after described the 5th resistance R 5 and the described capacitor C parallel connection, be connected with the 6th resistance R 6 between the negative input of the output terminal of described the 4th amplifier A4 and described the 3rd amplifier A3, the output terminal of described the 4th amplifier A4 is connected with the signal input part of described amplifying circuit.
As preferably, described second resistance R 2 is identical with the resistance of described the 3rd resistance R 3, the resistance of described first resistance R 1 is the twice of described second resistance R 2, and the resistance of described the 4th resistance R 4, described the 5th resistance R 5 and described the 6th resistance R 6 is four times of described second resistance R 2.Described the first transistor VT1, transistor seconds VT2, the 3rd transistor VT3 and the 4th transistor VT4 are NPN transistor.
Below be the analysis explanation to root-mean-square value change-over circuit principle:
Applied signal voltage Vin is converted to unipolar electric current I 1 by absolute value circuit,
I1 two triodes of VT1, VT2 of flowing through utilize the characteristic of triode, obtain the output voltage U 2 of amplifier A2.The relation of U2 and I1 such as formula 2:
I3 is that the pass between the two is from the current signal of the DC voltage Uo feedback of output:
The I3 triode VT4 that flows through utilizes the triode characteristic, obtains the output voltage U 3 of amplifier A3, and the pass of U3 and I3 is:
U2 and U3 act on emitter and the base stage of triode VT3 respectively, utilize the triode characteristic, can obtain the relation of I4 and U2, U3:
With formula 2 and formula 4 substitution formula 5, the pass that can obtain I4 and I1, I3 is:
I4 drives the low-pass filter of being made up of the A4 amplifier, and then in fact I3 is exactly the mean value of I4, so just has
According to formula 3 and formula 1, the pass that can obtain root mean square circuit output Uo and input Vin is again:
Formula 8 has illustrated that the alternating voltage signal Vin of the output dc voltage Uo of root-mean-square value change-over circuit and input satisfies the relation of root-mean-square value mathematical definition, is real effective value conversion.This circuit is strict root-mean-square value change-over circuit, and test shows, in the 5Hz-1000Hz scope, no matter contains several frequency contents in the waveform of input signal, and the DC voltage size of output is that strictness is proportional to according to the signal root-mean-square value.Amplifier in the circuit needs positive and negative two power supplys power supply, and two-wire system transformer is only by two lead power supplies and transmission output current signal.So in design, be provided with diode string (as shown in Figure 1), utilize the basicly stable characteristics of diode forward forward voltage, for the element that needs the negative and positive dual power power supply provides suitable negative supply voltage.Root-mean-square value change-over circuit and voltage-current converter circuit are integrated suitably gain and the biasing of regulation voltage current converter circuit, the i.e. electric current of exportable 4-20mA, the root-mean-square value of direct corresponding vibration velocity.As seen from Figure 1, the electric current I of pull-up resistor RL of finally flowing through be current signal I1 and the basic static current of lcd I0 of each several part circuit and, so the basic static current of lcd of each several part circuit must just may be realized the output requirement of two-wire system transformer 4-20mA electric current less than 4mA.
Detection test and the result of real effective vibration severity two-wire system transformer of the present invention:
Transmitter of the present invention has been carried out detecting test, comprised linearity test, waveform comparison test and temperature characterisitic test are with the validity of checking design.By a function generator analog vibration rate signal, test the current output value of this transmitter under the difference excitation with reometer mA shelves.
Linearity test:
Send by function generator and to arrive big sine voltage waveform in the transmitter range from childhood, analyze the corresponding relation of electric current output and input signal, the result is as shown in table 1.
From table 1 and Fig. 3 as can be seen, error range between the real output value of the electric current of this transmitter under difference excitation and the theoretical output valve of electric current is between-0.643%-0.7299%, error is very little, shows to adopt transmitter of the present invention can realize accurate conversion to vibration velocity signal real effective well.
Table 1 linearity test findings
The comparison of wave shape test
Send sinusoidal waveform by function generator, the output voltage of record true rms circuit this moment; Again by function generator send same frequency, with the amplitude square wave, record this moment true rms circuit output voltage.Verify with this whether the effective value change-over circuit also can accurately reflect its real effective to complicated wave form in transmitter.Test shows (seeing Table 2): when function generator sends sine wave, the output voltage of transmitter root-mean-square value change-over circuit and the error between the waveform effective value only are 0.3%, when function generator originating party ripple, the output voltage of transmitter root-mean-square value change-over circuit and the error between the waveform effective value only are 0.6%, in sum, the root-mean-square value change-over circuit can reflect that accurately it really has value to complicated wave form in the frequency converter.
Table 2 comparison of wave shape test findings
Humid test
Transmitter circuit is placed Homothermal Proof Box, apply one and stablize input signal, record its output valve under 25-65 degree centigrade, observe its stability under different temperatures.
Table 3 humid test result
| Signal zero peak value Vin (mV) | Temperature (℃) | Output current value (Hz) |
| 800 | 25 | 18.19 |
| 800 | 65 | 18.10 |
| 800 | 25 | 18.19 |
Test findings shows (being shown in Table 3), and transmitter is through the temperature cycles between 25 and 65 degrees centigrade, and its output valve is stable, is acted upon by temperature changes less than %1.
Claims (6)
1. real effective vibration severity two-wire system transformer, its circuit comprises amplifying circuit, it is characterized in that: also comprise the root-mean-square value change-over circuit, described root-mean-square value circuit comprises absolute value circuit, power division circuit and filtering circuit, the signal input part of described absolute value circuit is connected with the signal output part of vibrating speed sensors, the signal output part of described absolute value circuit is connected with the signal input part of described power division circuit, the signal output part of described power division circuit is connected with the signal input part of described filtering circuit, and the signal output part of described filtering circuit is connected with the signal input part of described amplifying circuit.
2. real effective vibration severity two-wire system transformer according to claim 1, it is characterized in that: described absolute value circuit comprises first resistance (R1), second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), first diode (VD1), second diode (VD2) and first amplifier (A1), first end of described first resistance (R1) is the signal input part of described absolute value circuit, second end of described first resistance (R1) is connected with the electrode input end of described first amplifier (A1), the negative input ground connection of described first amplifier (A1), the output terminal of described first amplifier (A1) is connected with the negative pole of described first diode (VD1) and the positive pole of described second diode (VD2) simultaneously, the anodal of described first diode (VD1) is connected with the electrode input end of described first amplifier (A1) and an end of described second resistance (R2) simultaneously, the other end of described second resistance (R2) is connected with the negative pole of described second diode (VD2) and first end of described the 3rd resistance (R3) simultaneously, the two ends of described the 4th resistance (R4) are connected with first end of first resistance (R1) and second end of described the 3rd resistance (R3) respectively, and second end of described the 3rd resistance (R3) is the signal output part of described absolute value circuit.
3. real effective vibration severity two-wire system transformer according to claim 2 is characterized in that:
Described power division circuit comprises second amplifier (A2), the 3rd amplifier (A3), the first transistor (VT1), transistor seconds (VT2), the 3rd transistor (VT3) and the 4th transistor (VT4), the electrode input end of described second amplifier (A2) is the signal input part of described power division circuit, the electrode input end of described second amplifier (A2) is connected with second end of described the 3rd resistance (R3) and the collector of the first transistor (VT1) simultaneously, the negative input ground connection of described second amplifier (A2), the output terminal of described second amplifier (A2) is connected with the emitter of transistor seconds (VT2) and the emitter of the 3rd transistor (VT3) simultaneously, the base stage of described transistor seconds (VT2) is connected with the collector of described transistor seconds (VT2) and the emitter of described the first transistor (VT1) simultaneously, the base earth of described the first transistor (VT1), the base stage of described the 3rd transistor (VT3) is connected with the output terminal of described the 3rd amplifier (A3) and the emitter of described the 4th transistor (VT4) simultaneously, the negative input of described the 3rd amplifier (A3) is connected with the collector of described the 4th transistor (VT4), the base earth of described the 4th transistor (VT4), the electrode input end ground connection of described the 3rd amplifier (A3), the current collection of described the 3rd transistor (VT3) is the signal output part of power division circuit very.
4. real effective vibration severity two-wire system transformer according to claim 3, it is characterized in that: described filtering circuit comprises the 4th amplifier (A4), the 5th resistance (R5) and electric capacity (C), the negative input of described the 4th amplifier (A4) is the signal input part of described filtering circuit, the negative input of described the 4th amplifier (A4) is connected with the collector of described the 3rd transistor (VT3), the electrode input end of described the 4th amplifier (A4) is connected back ground connection with the electrode input end of described the 3rd amplifier (A3), described the 5th resistance (R5) is connected with the 4th amplifier (A4) output terminal with the negative input of described the 4th amplifier (A4) respectively with its two ends, described electric capacity (C) back in parallel, be connected with the 6th resistance (R6) between the negative input of the output terminal of described the 4th amplifier (A4) and described the 3rd amplifier (A3), the output terminal of described the 4th amplifier (A4) is connected with the signal input part of described amplifying circuit, and the output terminal of described the 4th amplifier (A4) is the signal output part of described filtering circuit.
5. real effective vibration severity two-wire system transformer according to claim 4, it is characterized in that: described second resistance (R2) is identical with the resistance of described the 3rd resistance (R3), the resistance of described first resistance (R1) is the twice of described second resistance (R2), and the resistance of described the 4th resistance (R4), described the 5th resistance (R5) and described the 6th resistance (R6) is four times of described second resistance (R2).
6. real effective vibration severity two-wire system transformer according to claim 3, it is characterized in that: described the first transistor (VT1), transistor seconds (VT2), the 3rd transistor (VT3) and the 4th transistor (VT4) are NPN transistor.
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| CN 201110432268 CN102519575B (en) | 2011-12-21 | 2011-12-21 | True RMS vibration intensity two wire transmitter |
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| CN103323096B (en) * | 2013-05-24 | 2014-09-17 | 江阴市江凌科技有限公司 | Vibration severity measuring circuit |
| CN109211390B (en) * | 2018-08-24 | 2020-12-15 | 国网山东省电力公司电力科学研究院 | Safety test and evaluation method for vibration and strength of power transmission tower |
| CN114383654A (en) * | 2021-12-14 | 2022-04-22 | 浙江华章科技有限公司 | Motor temperature, vibration, current analysis and life prediction circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256096A (en) * | 2007-03-01 | 2008-09-03 | 中国石油天然气股份有限公司 | Transmitter for equipment vibrating signal |
| CN201348536Y (en) * | 2008-12-08 | 2009-11-18 | 江阴众和电力仪表有限公司 | Intelligent shaft vibration transmitter |
| CN101858778A (en) * | 2010-05-28 | 2010-10-13 | 浙江大学 | Vibration monitoring-based wind generator set automatic fault diagnosis method |
| CN102262174A (en) * | 2011-04-29 | 2011-11-30 | 大连丰和电力科技有限公司 | Voltage sensor |
| CN202393493U (en) * | 2011-12-21 | 2012-08-22 | 成都赛腾自动化工程有限公司 | True effective value vibration severity two-wire system transmitter |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256096A (en) * | 2007-03-01 | 2008-09-03 | 中国石油天然气股份有限公司 | Transmitter for equipment vibrating signal |
| CN201348536Y (en) * | 2008-12-08 | 2009-11-18 | 江阴众和电力仪表有限公司 | Intelligent shaft vibration transmitter |
| CN101858778A (en) * | 2010-05-28 | 2010-10-13 | 浙江大学 | Vibration monitoring-based wind generator set automatic fault diagnosis method |
| CN102262174A (en) * | 2011-04-29 | 2011-11-30 | 大连丰和电力科技有限公司 | Voltage sensor |
| CN202393493U (en) * | 2011-12-21 | 2012-08-22 | 成都赛腾自动化工程有限公司 | True effective value vibration severity two-wire system transmitter |
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