CN203616001U - Multi-channel multi-phase vibration signal amplitude-frequency synchronous acquisition circuit with excitation self-test - Google Patents
Multi-channel multi-phase vibration signal amplitude-frequency synchronous acquisition circuit with excitation self-test Download PDFInfo
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- CN203616001U CN203616001U CN201320827781.2U CN201320827781U CN203616001U CN 203616001 U CN203616001 U CN 203616001U CN 201320827781 U CN201320827781 U CN 201320827781U CN 203616001 U CN203616001 U CN 203616001U
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Abstract
The utility model provides a multi-channel multi-phase vibration signal amplitude-frequency synchronous acquisition circuit with excitation self-test. The circuit includes acquisition channels and self-detecting channels; each acquisition channel includes an interface circuit, a signal conditioning circuit, a frequency and amplitude calculation unit and a level conversion circuit which are connected in sequence, each interface circuit being connected to a vibration signal outputted by a vibration sensor, and each level conversion circuit outputting a digital signal to an FPGA control unit; and each self-detecting channel is mainly an excitation signal circuit, and the FPGA control unit injects an excitation signal into each acquisition channel via each excitation signal circuit. According to the needs of a vibration active control system, in the process of vibration signal acquisition, the amplitude and frequency of the vibration signals are not only simultaneously collected, but the state of the acquisition circuit and the sensor state are also monitored in real time.
Description
Technical field
The utility model relates to the signal Real-time Collection circuit in vibration active control system field.
Background technology
Collection, analysis and the processing of vibration signal are the problems that a lot of slip-stick artists run into.By collection and the analysis of vibration signal, it can be the judgement of product quality, the inspection of engine failure and early warning, aircraft, the structural health analysis of steamer or automobile provides important data supporting, Real-time Collection vibration signal can effectively and in time be understood the duty of product, to the health of product, product quality is made instant state judgement, especially in field of aerospace, grasp in real time the state of product, instant feedback is carried out in the product place that has potential safety hazard, make real-time grasp, on affecting the product of aircraft security, make instant replacing and maintenance.
In vibration active control system field, vibration signals collecting circuit is extremely important accurately in real time, in actual use, due to the reasons such as vibration transducer faults itself or line fault cause cannot be correct collection vibration signal, cause very large burden can to ground crew and support personnel; If vibration signals collecting is for perception outside manufacture physical construction is when safe, because Acquisition Circuit real-time is poor, gather out of true, sensor fault or line fault is former thereby the vibration signal intensity in the collection external world that can not be promptly and accurately, be easy to make aircraft and excessively use this product, finally affect aircraft security.Simultaneously under the large comprehensive background of aerocraft system, need a kind of from detecting Multi-channel Vibration Signals Real-time Collection circuit, not only vibration signals collecting circuit has high reliability, and can judge the on/off state of vibration transducer on/off state, circuit, problematic Acquisition Circuit is changed timely and overhauled.
Utility model content
The above-mentioned defect existing for solving traditional scheme, the utility model provides a kind of heterogeneous vibration signal amplitude-frequency of multichannel synchronous acquisition circuit with excitation self-test.
The technical solution of the utility model is as follows:
The heterogeneous vibration signal amplitude-frequency of the multichannel synchronous acquisition circuit with excitation self-test, comprises FPGA control module and multiple transmission channel, and result is delivered to pci bus by FPGA control module, and wherein each transmission channel comprises acquisition channel and from sense channel; Described acquisition channel comprises interface circuit, signal conditioning circuit, frequency and the magnitude determinations unit, the level shifting circuit that connect successively, the vibration signal of described interface circuit access vibration transducer output, level shifting circuit output digit signals is to FPGA control module; Described frequency and magnitude determinations unit are divided into two parallel branch roads, and a branch road adopts hysteresis comparator circuit to carry out frequency computation part, and another branch road adopts high-order lowpass filtering circuit and digital-to-analogue conversion circuit to carry out amplitude calculating; Describedly be mainly pumping signal circuit from sense channel, FPGA control module injects pumping signal by pumping signal circuit in acquisition channel.
Based on above-mentioned basic scheme, the utility model also does following optimization and limits and improve:
Above-mentioned pumping signal circuit comprises driving voltage circuit and excitation source signal circuit, and wherein the output terminal of driving voltage circuit is connected to signal conditioning circuit, and excitation source signal circuit is connected to interface circuit.
This heterogeneous vibration signal amplitude-frequency of multichannel synchronous acquisition circuit with excitation self-test also comprises constant-current source circuit, this constant-current source circuit provides working current for vibration transducer, FPGA gathers the voltage between constant-current source circuit and vibration transducer by voltage collection circuit and A/D change-over circuit, with the duty of detecting sensor.
The utlity model has following characteristics:
A. the accurate collection of vibration signal frequency and amplitude; first this circuit passes through every straight protection interface circuit, processes by signal conditioning circuit the vibration sensor signal of input; and then be divided into respectively calculated rate and amplitude of two-way; carry out frequency computation part by hysteresis comparator circuit; carry out amplitude calculating by high-order lowpass filtering and digital-to-analogue conversion circuit; acquisition precision is 16, is finally transformed signal is delivered in FPGA by level.
B. vibration signals collecting circuit state detects.When Acquisition Circuit is in running order, use the detection of driving voltage circuit completing circuit state; Acquisition Circuit, in the time of off working state, is used the detection of excitation source signal circuit completing circuit state.
C. vibration transducer state-detection.By voltage collection circuit and A/D conversion circuit, the voltage between vibration transducer and constant current source voltage is monitored, judged vibration transducer state according to the difference of magnitude of voltage.
D. the vibration signal of emphasis guarded region is carried out to double channels acquisition and judgement, prevent that the vibration signals collecting circuit in key monitoring region from breaking down, the vibration signal of non-key area carries out single channel collection.
E. by the outside Acquisition Circuit of fpga logic control, poll outside Acquisition Circuit is conducted interviews, reaches outside multi channel signals Real-time Collection.
F. this circuit design is simple, and dependable performance facilitates integratedly, can be used for various vibration signals collectings.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model.
Fig. 2 is the multichannel schematic diagram of error-tolerance type of the present utility model.
Embodiment
According to the demand of vibration active control system, in the process of vibration signals collecting, not only collect amplitude and the frequency of vibration signal simultaneously, and monitor in real time state and the sensor states of Acquisition Circuit.Acquisition Circuit design as principle framework figure as shown in Figure 1.
The interface circuit of vibration signal, signal conditioning circuit, hysteresis comparator circuit, high-grade filting circuit, A/D change-over circuit, level shifting circuit, sinusoidal excitation source signal circuit, driving source potential circuit, constant-current source circuit and Programmable Logic Device, interface collection and signal condition join, signal condition is connected with hysteresis comparator circuit and high-grade filting circuit respectively, high-grade filting circuit is connected with analog-to-digital conversion circuit, hysteresis comparator circuit and analog-to-digital conversion circuit result are transformed in FPGA through over level, FPGA result is delivered in pci bus, above circuit flow process completes the frequency of vibration signal and the collection of amplitude.FPGA controls sinusoidal excitation source signal circuit simultaneously, control driving source potential circuit applies excitation to Acquisition Circuit, the state of test Acquisition Circuit; Constant-current source circuit is for vibration transducer provides the voltage between working current, simultaneously back production constant current source and sensor, is used for the duty of detecting sensor; This circuit also provides fault-tolerance arbitration functions and the real-time acquisition function of multiple signals.
One, vibration signals collecting amplitude-frequency Acquisition Circuit
As shown in Figure 1, the output of vibration transducer, after interface circuit and modulate circuit, enters high-grade filting and A/D Acquisition Circuit, is then transformed and is entered logical process by level, completes amplitude collection; After conditioning, circuit result is by hysteresis circuitry, then enters logical process and complete frequency collection.
In interface circuit, with transient state killer tube, a pair of differential signal of vibration transducer input is carried out to overvoltage protection, and remove and disturb and DC component by RC first-order filtering, to in signal conditioning circuit, amplify through first filtered signal again, after signal condition, carry out high-order lowpass filtering, effectively avoid the interference of high-frequency signal, in present design, adopt high-grade filting, high-grade filting advantage is the decay having between good passband and stopband, can reach-60dB/ of the decay of high-grade filting ten octaves, can only reach-40dB/ of the decay of general second-order filter ten octaves.Every road analog-to-digital conversion circuit is separate, has 16 bit resolutions, gathers degree of accuracy higher, and single channel sampling rate can reach 100k/s, according to sampling thheorem, meets vibration sampling request completely.Level conversion completes the conversion of A/D Acquisition Circuit signal and programmable logic device (PLD) direct voltage.Programmable logic device (PLD) is used the clock of pci bus to carry out logic control to A/D change-over circuit, and collection result is saved in internal data buffer zone.Programmable logic device (PLD) control A/D gathers, and does not take the resource of CPU, greatly improves the work efficiency of CPU.
Vibration signal channel interface circuit and modulate circuit complete the collection to this channel frequence through hysteresis circuitry, hysteresis comparator circuit adopts sluggish comparison principle to change signal, sine wave is converted into square wave, transform by level again, complete the input of square wave, FPGA (Field Programmable Gate Array) adopts counting method to complete frequency computation part, and result of calculation is saved in internal data buffer zone, finally by pci bus, collection result is delivered to CPU.Programmable logic device (PLD) is carried out frequency computation part, does not take the resource of CPU, greatly improves the work efficiency of CPU.
Two, vibration signals collecting circuit state detects
In this programme design, the state-detection of vibration signals collecting circuit is divided into two states: electric circuit inspection under electric circuit inspection and duty under off working state.
Under off working state, electric circuit inspection is that sensor is not worked, the vibration signal that now sensor cannot the perception external world, FPGA (Field Programmable Gate Array) control excitation source signal circuit produces a sinusoidal signal, amplitude frequency can arrange, again pumping signal is input to former Acquisition Circuit, amplitude and the frequency of collection result and driving source being sent to signal contrast, and in the time that both come to the same thing, Acquisition Circuit is normal; In the time that both results exceed error threshold, now Acquisition Circuit error is excessive, needs fault to report; In the time that Acquisition Circuit cannot gather, now Acquisition Circuit opens circuit, and needs fault to report.
Under duty, electric circuit inspection is working sensor, now FPGA (Field Programmable Gate Array) control driving voltage circuit applies a negative voltage bias to gathering rear signal, contrast excitation applies effect porpoise amplitude maximal value, when both differences with apply negative voltage bias time in the same size, Acquisition Circuit is working properly, in the time that both are inconsistent, Acquisition Circuit work is undesired.Because acquisition rate is very high, apply surrounding time very short, the vibration signal of extraneous sensor collection changes and can ignore; This method is used repeatedly exciting test, and comparing result comprehensively judges.
Three, vibration transducer state-detection
The vibration transducer adopting in this programme is to provide working current by constant-current source circuit for it, and vibration transducer is converted into extraneous vibration signal the sine voltage signal of variation.
This programme detects vibration transducer state by the voltage gathering between constant-current source circuit and sensor.When vibration transducer is during in off state, constant-current source circuit cannot form voltage difference, and electric current also cannot form path, and the voltage detecting is 28V; When vibration transducer is during in short circuit, it is directly connected with ground, detects to such an extent that voltage is 0V; In the time that vibration transducer is normally worked, vibration transducer is equivalent to extraneous load, plays dividing potential drop, detects to such an extent that voltage range is 10V～20V.Error-tolerance type vibration signals collecting
In this programme design, for key monitoring region, carry out double channels acquisition, the same area is arranged two vibration transducers, then two vibration signals that collect are processed.In the time that the two paths of signals result collecting is consistent, get the mean value of two-way result as the final end value in this region.In the time that two paths of signals result is inconsistent, FPGA (Field Programmable Gate Array) control driving voltage circuit is to the carrying out of two passages from detecting, if wherein a certain road is detected normally, Yong Gai road collection result is as the signals collecting value in this region; If two-way is all undesired, represent insincere to the collection result of this two-way; If two-way is all normal, represent insincere to the collection result of this two-way.To general guarded region, carry out single channel collection, the cycle carries out from detecting circuit.In the time that electric circuit inspection result is normal, the collection result of this passage is credible; If when electric circuit inspection result is undesired, the collection result of this passage is insincere.
Four, multi channel signals Real-time Collection
Programmable logic device (PLD) adopts pci bus clock to control, and pci bus clock is 66Mhz, and FPGA (Field Programmable Gate Array) control multi-channel A/D chip is worked simultaneously, and is stored in the register in FPGA (Field Programmable Gate Array); The frequency computation part of control signal; Controlling vibration signals collecting circuit state detects; Complete pci bus steering logic etc.
A/D gathers and controls startup by FPGA simultaneously, guarantees that AD is operated in synchronization collection, and sampled value transforms through over level, delivers in FPGA.Because above-mentioned A/D sampling rate can reach 100k/s,, the design carries out high-frequency poll by FPGA (Field Programmable Gate Array) to A/D conversion circuit and obtains, and reaches Real-time Collection function.
Claims (3)
1. there is the heterogeneous vibration signal amplitude-frequency of the multichannel synchronous acquisition circuit of excitation self-test, it is characterized in that: comprise FPGA control module and multiple transmission channel, result is delivered to pci bus by FPGA control module, and wherein each transmission channel comprises acquisition channel and from sense channel; Described acquisition channel comprises interface circuit, signal conditioning circuit, frequency and the magnitude determinations unit, the level shifting circuit that connect successively, the vibration signal of described interface circuit access vibration transducer output, level shifting circuit output digit signals is to FPGA control module; Described frequency and magnitude determinations unit are divided into two parallel branch roads, and a branch road adopts hysteresis comparator circuit to carry out frequency computation part, and another branch road adopts high-order lowpass filtering circuit and digital-to-analogue conversion circuit to carry out amplitude calculating; Describedly be mainly pumping signal circuit from sense channel, FPGA control module injects pumping signal by pumping signal circuit in acquisition channel.
2. the heterogeneous vibration signal amplitude-frequency of the multichannel synchronous acquisition circuit with excitation self-test according to claim 1, it is characterized in that: described pumping signal circuit comprises driving voltage circuit and excitation source signal circuit, wherein the output terminal of driving voltage circuit is connected to signal conditioning circuit, and excitation source signal circuit is connected to interface circuit.
3. the heterogeneous vibration signal amplitude-frequency of the multichannel synchronous acquisition circuit with excitation self-test according to claim 1, it is characterized in that: this heterogeneous vibration signal amplitude-frequency of multichannel synchronous acquisition circuit with excitation self-test also comprises constant-current source circuit, this constant-current source circuit provides working current for vibration transducer, FPGA gathers the voltage between constant-current source circuit and vibration transducer by voltage collection circuit and A/D change-over circuit, with the duty of detecting sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320827781.2U CN203616001U (en) | 2013-12-13 | 2013-12-13 | Multi-channel multi-phase vibration signal amplitude-frequency synchronous acquisition circuit with excitation self-test |
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| CN201320827781.2U CN203616001U (en) | 2013-12-13 | 2013-12-13 | Multi-channel multi-phase vibration signal amplitude-frequency synchronous acquisition circuit with excitation self-test |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108089053A (en) * | 2017-11-23 | 2018-05-29 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of excitation self testing circuit |
| CN108613715A (en) * | 2016-12-12 | 2018-10-02 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fuel-quantity transducer acquisition system based on AC proportion method |
| CN109489795A (en) * | 2018-12-28 | 2019-03-19 | 晋江万芯晨电子科技有限公司 | A kind of self-energizing vibrating sensor |
| CN112098709A (en) * | 2020-08-14 | 2020-12-18 | 陕西千山航空电子有限责任公司 | Acquisition circuit of self-adaptive microvolt analog voltage signal |
-
2013
- 2013-12-13 CN CN201320827781.2U patent/CN203616001U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613715A (en) * | 2016-12-12 | 2018-10-02 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fuel-quantity transducer acquisition system based on AC proportion method |
| CN108613715B (en) * | 2016-12-12 | 2020-04-07 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fuel quantity sensor acquisition system based on alternating current proportion method |
| CN108089053A (en) * | 2017-11-23 | 2018-05-29 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of excitation self testing circuit |
| CN108089053B (en) * | 2017-11-23 | 2020-02-14 | 中国航空工业集团公司西安航空计算技术研究所 | Excitation self-test circuit |
| CN109489795A (en) * | 2018-12-28 | 2019-03-19 | 晋江万芯晨电子科技有限公司 | A kind of self-energizing vibrating sensor |
| CN112098709A (en) * | 2020-08-14 | 2020-12-18 | 陕西千山航空电子有限责任公司 | Acquisition circuit of self-adaptive microvolt analog voltage signal |
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