CN1410745A - Integrated vibration signal complete period equal phase high speed synchronous data collection system - Google Patents
Integrated vibration signal complete period equal phase high speed synchronous data collection system Download PDFInfo
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- CN1410745A CN1410745A CN 02145406 CN02145406A CN1410745A CN 1410745 A CN1410745 A CN 1410745A CN 02145406 CN02145406 CN 02145406 CN 02145406 A CN02145406 A CN 02145406A CN 1410745 A CN1410745 A CN 1410745A
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Abstract
The acquisition system includes the conditioning circuit and the key phase signal processing circuit. The conditioning circuit can separate AC signal from DC signal. The one end of the conditioning circuit is connected to the vibration signal of the sensor. The another end of the conditioning circuit is connected to the A/D conversion circuit through FIFO storage, connecting to ISB bus. The one end of the circuit for processing the key phase signal is connected to the key phase signal through double frequency, connecting to the A/D conversion circuit. The read/write control circuit is connected to the A/D conversion circuit and the FIFO storage respectively. In the invention, the conditioning circuit, the circuit for processing the key phase signal and the A/D conversion circuit are integrated in one piece of circuit board.
Description
Technical field
The present invention relates to be directly transferred to vibrating device in the detectors measure solid by utilization, is a kind of integrated vibration signal equiphase complete cycle high-speed synchronous data acquiring system.
Background technology
The vibration signal of rotating machinery comprises abundant status information.It is that vibration transducer is installed at positions such as bearing, shaft couplings that rotating machinery vibrating is measured method commonly used, convert vibratory output to electric signal, this electric signal carries out conversion process (as filtering, amplification etc.) through certain translation circuit, convert analog quantity to digital quantity with sample circuit again, send into computing machine then, be for further processing.The vibration survey of rotating machinery must be satisfied following requirement:
1) AC signal and direct current signal are sampled respectively;
2) sample frequency height, collection is counted many;
3) fixing phase place starting point to be arranged, and equiphase sampling complete cycle.
At present, more common way is to adopt general data acquisition system (DAS), but must develop special-purpose modulate circuit and key signal treatment circuit, is mated the above-mentioned this special sampling task of finishing.Circuit-board card quantity is many like this, and the line between the circuit is more complicated also.On the one hand, take the more bus slot of industrial computer, when the slot of industrial computer is not enough, also need additional cabinet.On the other hand, also be unfavorable for improving the stability and the reliability of system.
Summary of the invention
The purpose of this invention is to provide and a kind of vibration signal modulate circuit, key signal treatment circuit, A/D change-over circuit are integrated on the circuit board, form integrated vibration signal equiphase complete cycle high-speed synchronous data acquiring system.
The technical solution used in the present invention is as follows:
It comprises: the modulate circuit that can separate the AC and DC signal and amplify respectively that an end is connected with the vibration signal of sensor, another termination analog to digital conversion circuit of modulate circuit, connect isa bus through push-up storage, the key signal treatment circuit of one termination key signal, connect mould/number conversion circuit after frequency multiplication, read-write control circuit is connected with the storer of mould/number conversion circuit and first in first out respectively.
Said modulate circuit is 8 the tunnel, and the vibration signal on each road connects subtraction circuit and connects zeroing circuit through the amplifying circuit output DC component through being divided into two the tunnel, the one tunnel every alternating circuit, and another road connects subtraction circuit through the low-pass filter output DC component.
The key signal treatment circuit comprises that pre-service that the voltage transitions with key signal that an end is connected with key signal becomes digital circuit voltage partly, pre-service another termination up counter partly is divided into two the tunnel, one the tunnel connects down counter through frequency divider, clock, another road through latch, connect down counter, the acquisition pulse of down counter connects mould/number conversion circuit, and latch connects isa bus through parallel interface.
The beneficial effect that the present invention has is: vibration signal modulate circuit, key signal treatment circuit, A/D convertor circuit are integrated on the circuit board, form the module of a telotism.Improved the stability and the reliability of system's operation, and reduced number of circuit boards, helped saving the bus slot of industrial computer, made the installation of system and wiring become simple.Acquisition system utilizes special-purpose key signal treatment circuit to realize equiphase acquisition controlling complete cycle of signal, adopts the ultra high speed A chip of strict synchronism and special circuit design, guarantees the synchronism requirement between the vibration signal.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is the modulate circuit block diagram;
Fig. 3 is a key signal treatment circuit block diagram;
Fig. 4 is A/D conversion and control circuit figure thereof;
Fig. 5 is the read-write control circuit sequential chart;
Fig. 6 is the modulate circuit schematic diagram;
Fig. 7 is a key signal treatment circuit schematic diagram;
Fig. 8 is the driver process flow diagram.
Embodiment
One, acquisition system principle of work
As shown in Figure 1, signal is taken from sensor, separates AC and DC signal and amplification respectively by modulate circuit 1, delivers to A/D change-over circuit 2.After frequency multiplication is carried out in the pulse of 3 pairs of key phases of key signal treatment circuit,, can realize integer-period sampled to vibration signal like this as the external trigger signal of A/D change-over circuit.The result of A/D conversion temporarily is stored in first in first out (FIFO) storer 4, the effect of read-write control circuit 5 is that correct control data is transferred to the FIFO storer from the A/D change-over circuit, when the data among the FIFO half-full (reach FIFO capacity half), can send signal to industrial computer, by the industrial computer reading of data, and further handle and store.
Two, vibration signal modulate circuit
As shown in Figure 2, modulate circuit is 8 the tunnel now, is wherein one the tunnel shown in the accompanying drawing.Vibration signal is isolated DC component through after alternating circuit 6, and after zeroing circuit 7 and amplifying circuit 8 amplifications, DC component outputs to the A/D change-over circuit; After DC component and original signal subtracted each other in subtraction circuit 9, the output AC component amplified AC compounent simultaneously, and to improve the precision of sampling, low-pass filter 10 then filters the high frequency noise composition.
Three, key signal treatment circuit
As shown in Figure 3, key signal treatment circuit 3 is actually a frequency multiplier circuit.Generally be provided with a groove in the rotating shaft of rotating machinery, with the position of special sensor monitors groove, rotating shaft is whenever circled, and sensor just sends a pulse signal.The key signal treatment circuit is just with this pulse signal frequency multiplication, and the trigger data acquisition circuit can be realized integer-period sampled like this.Usually realize frequency multiplication with a phase-locked loop circuit (as CD4046).The circuit of this method is fairly simple, can work well when invariablenes turning speed, but in the ascending, descending speed stage of rotating machinery, be difficult to adapt to change in rotational speed.Phase-locked loop circuit is a mimic channel in addition, and the parameter of electronic component (as resistance, electric capacity etc.) changes the stable and precision that can influence circuit, is unfavorable for the long time continuous working of circuit.Here the key signal treatment circuit of Ti Chuing is the structure of a full digital, can real-time follow-up rotation speed change, realizes integer-period sampled, working stability, reliably.Its principle is the cycle of measuring key signal earlier, calculates the cycle of frequency-doubled signal again, sends frequency-doubled signal by a counter, and this circuit replaces computation process with the method for clock division dexterously, thereby circuit is simple, reliable, and real-time is good.
The preprocessing part 12 of key signal treatment circuit becomes the voltage transitions of key signal the voltage of digital circuit.Clock signal 17 about 10MHZ as the clock signal of up counter 13, count key signal behind frequency divider 14 frequency divisions.Counting is since the pulse of a key phase, and zero clearing till next pulse restarts counting then, and count value is promptly represented the recurrence interval.This count value is saved in the latch 16, as the initial value of down counter 18.The clock of down counter does not carry out frequency division.Export a pulse when down counter reduces to 0, the value with latch writes again.The output pulse is desired frequency-doubled signal like this, adjusts the branch frequency of frequency divider, can obtain different sampling numbers.
The value of latch is delivered to parallel interface 15 simultaneously, selects for use modally 8255, and industrial computer can be read this value at any time, just can get the velocity amplitude of rotor through simple the conversion.Be provided with the overflow flag of up counter, can judge after industrial computer is read that rotor is to shut down or running.
Send the order of start key phase signals circuit when industrial computer after, be not to export sampling pulse immediately, but just begin to export sampling pulse when having key signal to arrive by the time, so just guaranteed to gather each time, the initial phase of vibration signal is the same.
Four, mould/number (A/D) conversion and control circuit principle thereof
As shown in Figure 4, this is the core of this acquisition system.The model of mould/number conversion circuit 2 is MAX125, is a kind of data acquisition chip of high speed 2 * 4 passages, 14 word lengths, and be 3uS the switching time of each passage.Have 4 sample/hold circuits on the sheet, each sample/hold circuit reusable is in 2 tunnel inputs.But synchronized sampling 4 road signals like this carry out the A/D conversion then in order respectively, and a slice MAX125 is used for the AC and DC part of 4 road vibration signals, can realize the synchronized sampling of AC signal, have also made full use of input channel.Every capture card has two MAX125, can gather 8 circuit-switched data.Rising edge at control signal CONVST begins the AD conversion, and when EOC, status signal INT becomes low level, so AD conversion available software triggers, also can be triggered by the key signal treatment circuit.
When picking rate was lower, the A/D change-over circuit can directly be linked on the bus, each EOC just by industrial computer with data read.But when picking rate improved, the response speed of industrial computer did not just catch up with, and was easy to cause loss of data.So increased push-up storage 4 between A/D circuit and bus, model is IDT7202, and every capacity is 1K*9, is provided with sky, half-full, full three status indication positions, can be for inquiry.Data temporarily leave in here, are read in batch by PC when data surpass a constant volume.Windows operating system at present commonly used is time-sharing system, and the ability of real-time response is relatively poor, and it is essential that this makes buffering between A/D chip and the computing machine become more.
As shown in Figure 5, when the conversion of two A/D chips all finishes, INTO becomes low level, trigger the interruption of single-chip microcomputer 89C2051, single-chip microcomputer sends 4 pulses at READ1 and WRITE end, reads the transformation result of 4 passages from a slice A/D and writes the FIFO, when reading first data, INTO returns to high level, and then sends 4 pulses at READ2 and WRITE end, and the transformation result of another A/D is also write among the FIFO.
Five, vibration signal modulate circuit principle of work
As shown in Figure 6, this figure is corresponding with accompanying drawing 2, at the input and output side of circuit voltage follower is arranged all, and the input impedance that can make circuit is big and output impedance is little.Every alternating circuit 6 are second-order low-pass filters, zeroing circuit 7 is see-saw circuits, W25 adjusts zero point by regulator potentiometer, and amplifying circuit 8 also is a sign-changing amplifier, and enlargement factor can be regulated by W2, subtraction circuit 9 subtracts each other DC component and original signal, obtain AC signal, W17 is used to adjust enlargement factor, and low-pass filter 10 is second-order filter circuits, radio-frequency component is filtered, claim frequency overlapped-resistable filter again.
Six, key signal treatment circuit principle of work
As shown in Figure 7, this figure is corresponding with Fig. 3.12 pairs of key signals of pre-service carry out stopping direct current, amplification, level conversion, become digital signal.Chip 74LS590 is 8 up counters that have latch, so up counter 13 in the accompanying drawing 3 and latch 16 are realized by same chip.Two 74LS590 form one 16 counter.Frequency divider 14 is made up of a slice 74AS867 and 74LS153, divider ratio optional 32,64,128 and 256.Clock 17 is a quartz crystal oscillator circuit.Down counter 18 is 16 digit counters, is made up of 2 74AS868.
Seven, driver flow process
As shown in Figure 8, the mode that driver adopts the delphi language to embed assembly language is write, and is write as the subroutine form, can supply other routine calls, gathers AC signal earlier, promptly begins the A/D conversion behind the start key circuitry phase.Determine with querying method whether FIFO is half-full, again FIFO capacity half (promptly 512) read industrial computer.The recycle inquiry has all been gathered 1024 data up to each passage.Gather direct current signal then, 1 data of each passage are used software trigger, read data behind the delay certain hour.
Claims (3)
1. integrated vibration signal equiphase complete cycle high-speed synchronous data acquiring system, it is characterized in that it comprises: the modulate circuit (1) that can separate the AC and DC signal and amplify respectively that an end is connected with the vibration signal of sensor, another termination analog to digital conversion circuit (2) of modulate circuit (1), connect isa bus through push-up storage (4), the key signal treatment circuit (3) of one termination key signal, connect mould/number conversion circuit (2) after frequency multiplication, read-write control circuit (5) is connected with the storer (4) of mould/number conversion circuit (2) and first in first out respectively.
2. integrated vibration signal equiphase complete cycle high-speed synchronous data acquiring according to claim 1 system, it is characterized in that: said modulate circuit (1) is 8 the tunnel, the vibration signal on each road connects subtraction circuit (9) and warp is divided into two the tunnel every alternating circuit (6), one the tunnel connects zeroing circuit (7) through amplifying circuit (8) output DC component, and another road connects subtraction circuit (9) through low-pass filter (10) output AC component.
3. integrated vibration signal equiphase complete cycle high-speed synchronous data acquiring according to claim 1 system, it is characterized in that: said key signal treatment circuit (3) comprises pre-service that the voltage transitions with key signal that an end is connected with key signal becomes digital circuit voltage partly (2), pre-service partly another termination up counter of (2) is divided into two the tunnel, one the tunnel through frequency divider (14), clock (17) connects down counter (18), another road is through latch (16), connect down counter (18), the acquisition pulse of down counter (18) connects mould/number conversion circuit (2), and latch (16) connects isa bus through parallel interface (15).
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| CN 02145406 CN1410745A (en) | 2002-11-12 | 2002-11-12 | Integrated vibration signal complete period equal phase high speed synchronous data collection system |
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| CN 02145406 CN1410745A (en) | 2002-11-12 | 2002-11-12 | Integrated vibration signal complete period equal phase high speed synchronous data collection system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032000A (en) * | 2010-11-09 | 2011-04-27 | 浙江大学 | Turbine status data acquisition device based on personal computer 104 (PC104) bus |
| CN102116670B (en) * | 2010-01-05 | 2012-08-08 | 华北电力科学研究院有限责任公司 | Vibration acquisition and analysis method |
| CN103345785A (en) * | 2013-07-15 | 2013-10-09 | 深圳沈鼓测控技术有限公司 | Method for monitoring abnormal halt of equipment |
| CN104180895A (en) * | 2013-05-24 | 2014-12-03 | 安徽容知日新信息技术有限公司 | Synchronous acquisition apparatus of vibration signal of rotary machine and vibration signal acquisition method |
| CN109357782A (en) * | 2018-12-21 | 2019-02-19 | 广州市优仪电子科技有限公司 | Temperature sensing circuit |
| CN114136428A (en) * | 2021-10-20 | 2022-03-04 | 西安交通大学 | Cantilever rotor vibration optical fiber testing method and system for measuring vibration and key phase signals |
-
2002
- 2002-11-12 CN CN 02145406 patent/CN1410745A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116670B (en) * | 2010-01-05 | 2012-08-08 | 华北电力科学研究院有限责任公司 | Vibration acquisition and analysis method |
| CN102032000A (en) * | 2010-11-09 | 2011-04-27 | 浙江大学 | Turbine status data acquisition device based on personal computer 104 (PC104) bus |
| CN102032000B (en) * | 2010-11-09 | 2013-08-28 | 浙江大学 | Turbine status data acquisition device based on personal computer 104 (PC104) bus |
| CN104180895A (en) * | 2013-05-24 | 2014-12-03 | 安徽容知日新信息技术有限公司 | Synchronous acquisition apparatus of vibration signal of rotary machine and vibration signal acquisition method |
| CN104180895B (en) * | 2013-05-24 | 2017-03-22 | 安徽容知日新科技股份有限公司 | Synchronous acquisition apparatus of vibration signal of rotary machine and vibration signal acquisition method |
| CN103345785A (en) * | 2013-07-15 | 2013-10-09 | 深圳沈鼓测控技术有限公司 | Method for monitoring abnormal halt of equipment |
| CN103345785B (en) * | 2013-07-15 | 2016-03-02 | 深圳沈鼓测控技术有限公司 | Unit exception monitoring shutdown method |
| CN109357782A (en) * | 2018-12-21 | 2019-02-19 | 广州市优仪电子科技有限公司 | Temperature sensing circuit |
| CN114136428A (en) * | 2021-10-20 | 2022-03-04 | 西安交通大学 | Cantilever rotor vibration optical fiber testing method and system for measuring vibration and key phase signals |
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