CN103513577A - A displacement sensor simulation circuit - Google Patents
A displacement sensor simulation circuit Download PDFInfo
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Abstract
The invention belongs to the technical field of telex flight control system tests, and especially relates to a displacement sensor simulation circuit. The displacement sensor simulation circuit of the invention can be divided into three parts which are an input signal processing circuit, a signal modulation circuit, and an output signal processing circuit. The simulation circuit receives simulation output signals, and decomposes the simulation output signals into two paths of direct current simulation signals which are corresponding to two secondary manipulated variables in terms of sizes. The two direct current simulation signals are modulated to two paths of alternating current simulation signals through the utilization of an amplitude modulation principle. A driving capability of the signals is raised through the utilization of a reactive circuit composed of an operational amplifier and a triode, and a transformer is driven to be an output, so that secondary output impedance characteristics of a linear displacement sensor are simulated. The displacement sensor simulation circuit of the invention is simple in design, low in cost, and can simulate the signals of the displacement sensor very well.
Description
Technical field
The invention belongs to fly-by-wire flight control system experimental technique field, especially relate to a kind of displacement transducer artificial circuit.
Background technology
On the aircraft of fly-by-wire flight control system, pilot control sensor is the manned signal source of aircraft, and it converts driver to voltage signal proportional to it to the manipulation displacement (or steering force) of jociey stick and pedal, sends into flight control computer.Fly-by-wire flight control system or control enhancing system, generally adopt displacement transducer as pilot control sensor.Pilot control sensor has following two kinds of forms:
Linear variable difference transformer (displacement transducer, LVDT): convert straight-line displacement to voltage signal.
Rotation variable differential transformer (angular displacement sensor, RVDT): convert angular displacement to voltage signal.
The feature that ambient temperature range is wide, highly sensitive and output signal is large that these two kinds of sensors all have is simple in structure, easy to use, adapt to, main is that reliability is high, the life-span is long, is widely used.Because the range of LVDT is large, linear output area is wide, easy for installation, applies more extensive.
In test, flight control computer need to gather the signal of these sensors, and the structure of traditional physical environment often needs long time, also needs to spend more expense simultaneously.And, under physical environment, be also difficult to the structure of fault and specific function from dynamic test.
Summary of the invention
Technical matters to be solved by this invention is: a kind of displacement transducer artificial circuit is provided, realizes the electronic simulation to displacement transducer signal.
Technical scheme of the present invention is: a kind of displacement transducer artificial circuit, is characterized by: described artificial circuit can be divided into three parts, that is: input signal processing circuit, signal modulation circuit, output signal processing circuit, input signal processing circuit receives the pumping signal from flight control computer, its high-end EX+ is connected to capacitor C 1 input 1 end, low side EX-is connected to capacitor C 2 input 1 ends, capacitor C 1, C2 inputs 2 ends contact resistance R1 respectively, R3 inputs 1 end, resistance R 1 input 2 end contact resistance R2 input 1 end and operational amplifier U1 inputs 1 end, resistance R 3 input 2 end concatenation operation amplifiers are inputted 2 ends and resistance R 4 input 1 ends, resistance R 4 input 2 end ground connection, after inputting 3 ends, export as carrier signal VCAR by resistance R 2 input 2 end concatenation operation amplifiers, resistance R 5 input 1 ends connect VCC, resistance R 5 input 2 end contact resistance R6 input 1 end, resistance R 6 input 2 end contact resistance R7 input 1 end, resistance R 7 input 2 end ground connection, resistance R 6 input 3 end concatenation operation amplifiers are inputted 2 ends, operational amplifier is inputted 1 end concatenation operation amplifier and is inputted 3 ends and resistance R 12 input 1 ends, R12 inputs 2 end concatenation operation amplifiers and inputs 1 end, resistance R 13 input 2 ends and resistance R 14 input 1 ends, from the high-end CON+ contact resistance of emulation host computer analog control signal, R8 inputs 1 end, from emulation host computer analog control signal low side CON-contact resistance, R9 inputs 1 end, 1 end inputted by resistance R 8 input 2 end concatenation operation amplifiers and resistance R 10 input 1 end resistance R 9 input 2 end contact resistance R11 input 1 end and operational amplifier is inputted 2 ends, resistance R 11 input 2 end ground connection, resistance R 10 input 2 end contact resistance R13 input 1 end and concatenation operation amplifier is inputted 3 ends, and as cell winding A emulation structure signal magnitude direct current signal CommandA output, resistance R 14 input 2 end concatenation operation amplifier U3 export as cell winding B emulation structure signal magnitude direct current signal CommandB after inputting 3 ends, signal modulation circuit receives the signal after input signal circuit is processed, carrier signal VCAR is connected to input 3 ends of analog multiplier U1, U2, CommandA signal is connected to input 1 end of analog multiplier U1, U2, analog multiplier U1, U2 input 2,4,6 ground connection, input 5 ends and be connected to power supply negative terminal VEE, input 8 is connected to the high-end VCC of power supply, and analog multiplier U1 exports 7 end output amplitude-modulated signal OUTA, and analog multiplier U2 exports 7 end output amplitude-modulated signal OUTB, output signal processing circuit reception of amplitude-modulated signals OUTA and OUTB, OUTA is connected to respectively to operational amplifier U1, U2 inputs 2 ends, operational amplifier U1 inputs 1 end and is connected to triode Q1, Q2 inputs 3 ends and transformer coil is inputted 1 end, operational amplifier U1 inputs 3 ends and is connected to triode Q1, Q2 inputs 1 end, the high-end VCC of power supply is connected to triode Q1 and inputs 2 ends, power supply low side VEE is connected to triode Q2 and inputs 2 ends, transformer coil T1 input end 2 ground connection, the high signal CoilA+ of transformer coil output terminal 3 simulation data sensor secondary coil A, transformer coil output terminal 4 simulation data sensor secondary coil A low signal CoilA-, operational amplifier U2 inputs 1 end and is connected to triode Q3, Q4 inputs 3 ends and transformer coil is inputted 1 end, operational amplifier U2 inputs 3 ends and is connected to triode Q3, Q4 inputs 1 end, the high-end VCC of power supply is connected to triode Q3 and inputs 2 ends, power supply low side VEE is connected to triode Q4 and inputs 2 ends, transformer coil T2 input end 2 ground connection, the high signal CoilB+ of transformer coil output terminal 3 simulation data sensor secondary coil B, transformer coil output terminal 4 simulation data sensor secondary coil A low signal CoilB-, linear movement pick-up two secondary signals are just out simulated.
Simplicity of design of the present invention, cost are low, can be good at the signal of mimotope displacement sensor, can bring following beneficial effect: the one, and reduce the demand of Aeroplane control test to physical environment, thereby shortened the construction schedule of experimental enviroment, reduced expense; The 2nd, in use can manually arbitrarily adjust each redundancy sensor signal magnitude, can conveniently set the sensor faults such as permanent deviation, stuck, perseverance gains, opens circuit, greatly facilitate flight control system fault and inject, alleviated the artificial burden in test simultaneously.
Accompanying drawing explanation
Fig. 1 is displacement transducer artificial circuit theory diagram of the present invention;
Fig. 2 is input signal processing circuit figure in displacement transducer artificial circuit of the present invention;
Fig. 3 is signal modulation circuit figure in displacement transducer artificial circuit of the present invention;
Fig. 4 is output signal processing circuit schematic diagram in displacement transducer artificial circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Referring to Fig. 1, the principle that a kind of displacement transducer artificial circuit of the present invention is realized emulation is: described artificial circuit receives from host computer the analog output signal by the replacement actual physics manipulated variable size of software control, based on setting adjustable respective sensor two secondary and threshold voltage signal in circuit, is decomposed into the DC simulation signal that two-way is corresponding with two secondary manipulated variable sizes; According to the ac-excited signal from flight control computer, utilize amplitude modulation principle that this two-way DC simulation signal is modulated to two-way AC analogue signal subsequently, this two-way AC analogue signal is corresponding to the output signal of institute's emulation sensor; Thereafter the driving force of utilizing the feedback circuit raising signal of operational amplifier and triode formation, driving transformer is as output, thus the secondary output impedance characteristic of artificial line displacement transducer.
Referring to Fig. 2,, Fig. 3, Fig. 4, a kind of displacement transducer artificial circuit of the present invention, can be divided into three parts, that is: input signal processing circuit, signal modulation circuit, output signal processing circuit, input signal processing circuit receives the pumping signal from flight control computer, its high-end EX+ is connected to capacitor C 1 input 1 end, low side EX-is connected to capacitor C 2 input 1 ends, capacitor C 1, C2 inputs 2 ends contact resistance R1 respectively, R3 inputs 1 end, resistance R 1 input 2 end contact resistance R2 input 1 end and operational amplifier U1 inputs 1 end, resistance R 3 input 2 end concatenation operation amplifiers are inputted 2 ends and resistance R 4 input 1 ends, resistance R 4 input 2 end ground connection, after inputting 3 ends, export as carrier signal VCAR by resistance R 2 input 2 end concatenation operation amplifiers, resistance R 5 input 1 ends connect VCC, resistance R 5 input 2 end contact resistance R6 input 1 end, resistance R 6 input 2 end contact resistance R7 input 1 end, resistance R 7 input 2 end ground connection, resistance R 6 input 3 end concatenation operation amplifiers are inputted 2 ends, operational amplifier is inputted 1 end concatenation operation amplifier and is inputted 3 ends and resistance R 12 input 1 ends, R12 inputs 2 end concatenation operation amplifiers and inputs 1 end, resistance R 13 input 2 ends and resistance R 14 input 1 ends, from the high-end CON+ contact resistance of emulation host computer analog control signal, R8 inputs 1 end, from emulation host computer analog control signal low side CON-contact resistance, R9 inputs 1 end, resistance R 8 input 2 end concatenation operation amplifiers are inputted 1 end and resistance R 10 input 1 ends, resistance R 9 input 2 end contact resistance R11 input 1 end and operational amplifier is inputted 2 ends, resistance R 11 input 2 end ground connection, resistance R 10 input 2 end contact resistance R13 input 1 end and concatenation operation amplifier is inputted 3 ends, and as cell winding A emulation structure signal magnitude direct current signal CommandA output, resistance R 14 input 2 end concatenation operation amplifier U3 export as cell winding B emulation structure signal magnitude direct current signal CommandB after inputting 3 ends, signal modulation circuit receives the signal after input signal circuit is processed, carrier signal VCAR is connected to input 3 ends of analog multiplier U1, U2, CommandA signal is connected to input 1 end of analog multiplier U1, U2, analog multiplier U1, U2 input 2,4,6 ground connection, input 5 ends and be connected to power supply negative terminal VEE, input 8 is connected to the high-end VCC of power supply, and analog multiplier U1 exports 7 end output amplitude-modulated signal OUTA, and analog multiplier U2 exports 7 end output amplitude-modulated signal OUTB, output signal processing circuit reception of amplitude-modulated signals OUTA and OUTB, OUTA is connected to respectively to operational amplifier U1, U2 inputs 2 ends, operational amplifier U1 inputs 1 end and is connected to triode Q1, Q2 inputs 3 ends and transformer coil is inputted 1 end, operational amplifier U1 inputs 3 ends and is connected to triode Q1, Q2 inputs 1 end, the high-end VCC of power supply is connected to triode Q1 and inputs 2 ends, power supply low side VEE is connected to triode Q2 and inputs 2 ends, transformer coil T1 input end 2 ground connection, the high signal CoilA+ of transformer coil output terminal 3 simulation data sensor secondary coil A, transformer coil output terminal 4 simulation data sensor secondary coil A low signal CoilA-, operational amplifier U2 inputs 1 end and is connected to triode Q3, Q4 inputs 3 ends and transformer coil is inputted 1 end, operational amplifier U2 inputs 3 ends and is connected to triode Q3, Q4 inputs 1 end, the high-end VCC of power supply is connected to triode Q3 and inputs 2 ends, power supply low side VEE is connected to triode Q4 and inputs 2 ends, transformer coil T2 input end 2 ground connection, the high signal CoilB+ of transformer coil output terminal 3 simulation data sensor secondary coil B, transformer coil output terminal 4 simulation data sensor secondary coil A low signal CoilB-, linear movement pick-up two secondary signals are just out simulated.
In specific implementation process, mimotope displacement sensor LVDT/RVDT circuit need to solve following problem:
1. resistance matching problem.Displacement transducer artificial circuit input and output impedance should meet the requirement of displacement transducer impedance operator substantially.
2. input/output signal corresponding relation.
Displacement transducer artificial circuit should be able to receive the pumping signal from flight control computer, output and pumping signal same frequency and the phase place little AC signal that lags behind.
3. output signal voltage and.
From displacement transducer principle, displacement transducer artificial circuit emulation secondary coil output voltage and should be definite value.
4. circuit correlation parameter is easy to regulate.
In the circuit of design, should be taken into account different characteristics, taked adjustable measure, make like this circuit of designing have larger versatility.
From external electrical input-output characteristic, displacement transducer artificial circuit has following difference: in input stage, replaced the physics input signal of operating control with an analog electrical signal input end, be convenient to like this appliance computer and control.
Displacement transducer artificial circuit is mainly that application amplitude modulation principle realizes.Amplitude modulation is with modulation signal x, to go to control the amplitude of high-frequency carrier signal.Displacement transducer artificial circuit be take the pumping signal on the former limit of original sensor and is that basis produces high-frequency carrier signal, (representing LVDT, RVDT iron core position quantity) the simulation computer dummy instruction signal of take is that basis produces two-way modulation signal, and after related circuit regulates as two secondary output corresponding signals.
When circuit design, the present invention notice following some:
1. modulation circuit principle
Modulation circuit is most crucial part in mimotope displacement sensor circuit.By two AD633, realize the corresponding road amplitude-modulated signal that produces of ，Mei road AD633, the transport function of AD633 is
as shown in Figure 3, X
2, Y
2, Z holds ground connection, and foregoing circuit transport function is:
2. reference voltage provides circuit.
In output signal processing circuit Fig. 4, to OutA, OutB has only done with amplitude and has processed, and driving force is improved, thereby export as circuit board.For guaranteeing that circuit board output meets displacement transducer output characteristics, need to guarantee the output of modulation circuit two-way and be definite value.
That is: OutA+OutB=is often worth
In circuit, Vcar is normal value, so from relational expression above, as long as guarantee that CommandA+CommandB is normal value.The corresponding signal size that represents LVDT, RVDT iron core position quantity that wherein CommandA provides for computing machine, in foregoing circuit, CommandA is computer instruction input respective value magnitude of voltage.A reference voltage is provided in input signal processing circuit Fig. 2 in displacement transducer artificial circuit, sliding resistance can be done part to magnitude of voltage and regulate, CommandB is the difference of benchmark and threshold voltage and computer instruction voltage, thereby has guaranteed the constant of modulation circuit output and value.
3. output signal driver circuit.
The output input current of TTL chip is generally all smaller, about 20mA.In order to guarantee its carrying load ability, utilize the nonlinear feedback characteristic of operational amplifier, designed following driving circuit, improved greatly carrying load ability.
4. other characteristic of circuit
Input signal conversion: displacement transducer artificial circuit has carried out differential transformation to input signal, is transformed to and the signal of circuit with ground each signal.
Input and output isolation: in order to simulate the reliability Work of associated impedances characteristic and assurance circuit.Imput output circuit has been taked to different quarantine measures, improved the connection safety of input-output device, and input and output impedance is approached.
In one embodiment of the present of invention, operational amplifier adopts LM124J chip, and analog multiplier adopts AD633JN, and triode Q1, Q3 adopt S8050, and triode Q3, Q4 adopt S8550.
Claims (1)
1. a displacement transducer artificial circuit, is characterized by: described artificial circuit can be divided into three parts, that is: input signal processing circuit, signal modulation circuit, output signal processing circuit, input signal processing circuit receives the pumping signal from flight control computer, its high-end EX+ is connected to capacitor C 1 input 1 end, low side EX-is connected to capacitor C 2 input 1 ends, capacitor C 1, C2 inputs 2 ends contact resistance R1 respectively, R3 inputs 1 end, resistance R 1 input 2 end contact resistance R2 input 1 end and operational amplifier U1 inputs 1 end, resistance R 3 input 2 end concatenation operation amplifiers are inputted 2 ends and resistance R 4 input 1 ends, resistance R 4 input 2 end ground connection, after inputting 3 ends, export as carrier signal VCAR by resistance R 2 input 2 end concatenation operation amplifiers, resistance R 5 input 1 ends connect VCC, resistance R 5 input 2 end contact resistance R6 input 1 end, resistance R 6 input 2 end contact resistance R7 input 1 end, resistance R 7 input 2 end ground connection, resistance R 6 input 3 end concatenation operation amplifiers are inputted 2 ends, operational amplifier is inputted 1 end concatenation operation amplifier and is inputted 3 ends and resistance R 12 input 1 ends, R12 inputs 2 end concatenation operation amplifiers and inputs 1 end, resistance R 13 input 2 ends and resistance R 14 input 1 ends, from the high-end CON+ contact resistance of emulation host computer analog control signal, R8 inputs 1 end, from emulation host computer analog control signal low side CON-contact resistance, R9 inputs 1 end, resistance R 8 input 2 end concatenation operation amplifiers are inputted 1 end and resistance R 10 input 1 ends, resistance R 9 input 2 end contact resistance R11 input 1 end and operational amplifier is inputted 2 ends, resistance R 11 input 2 end ground connection, resistance R 10 input 2 end contact resistance R13 input 1 end and concatenation operation amplifier is inputted 3 ends, and as cell winding A emulation structure signal magnitude direct current signal CommandA output, resistance R 14 input 2 end concatenation operation amplifier U3 export as cell winding B emulation structure signal magnitude direct current signal CommandB after inputting 3 ends, signal modulation circuit receives the signal after input signal circuit is processed, carrier signal VCAR is connected to input 3 ends of analog multiplier U1, U2, CommandA signal is connected to input 1 end of analog multiplier U1, U2, analog multiplier U1, U2 input 2,4,6 ground connection, input 5 ends and be connected to power supply negative terminal VEE, input 8 is connected to the high-end VCC of power supply, and analog multiplier U1 exports 7 end output amplitude-modulated signal OUTA, and analog multiplier U2 exports 7 end output amplitude-modulated signal OUTB, output signal processing circuit reception of amplitude-modulated signals OUTA and OUTB, OUTA is connected to respectively to operational amplifier U1, U2 inputs 2 ends, operational amplifier U1 inputs 1 end and is connected to triode Q1, Q2 inputs 3 ends and transformer coil is inputted 1 end, operational amplifier U1 inputs 3 ends and is connected to triode Q1, Q2 inputs 1 end, the high-end VCC of power supply is connected to triode Q1 and inputs 2 ends, power supply low side VEE is connected to triode Q2 and inputs 2 ends, transformer coil T1 input end 2 ground connection, the high signal CoilA+ of transformer coil output terminal 3 simulation data sensor secondary coil A, transformer coil output terminal 4 simulation data sensor secondary coil A low signal CoilA-, operational amplifier U2 inputs 1 end and is connected to triode Q3, Q4 inputs 3 ends and transformer coil is inputted 1 end, operational amplifier U2 inputs 3 ends and is connected to triode Q3, Q4 inputs 1 end, the high-end VCC of power supply is connected to triode Q3 and inputs 2 ends, power supply low side VEE is connected to triode Q4 and inputs 2 ends, transformer coil T2 input end 2 ground connection, the high signal CoilB+ of transformer coil output terminal 3 simulation data sensor secondary coil B, transformer coil output terminal 4 simulation data sensor secondary coil A low signal CoilB-, linear movement pick-up two secondary signals are just out simulated.
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Cited By (7)
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| CN105444663A (en) * | 2014-09-28 | 2016-03-30 | 中国航空工业集团公司西安飞机设计研究所 | RVDT design method on the basis of black box |
| CN106773786A (en) * | 2016-12-27 | 2017-05-31 | 北京润科通用技术有限公司 | A kind of RVDT signal simulations circuit, method and device |
| 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 |
| CN108170128A (en) * | 2017-12-28 | 2018-06-15 | 西安庆安航空试验设备有限责任公司 | Simulator, analogy method and the simulated assembly of LVDT input-output characteristics |
| CN109445321A (en) * | 2018-09-29 | 2019-03-08 | 庆安集团有限公司 | A kind of Sensor Signal Simulation Circuit |
| CN109656152A (en) * | 2018-12-25 | 2019-04-19 | 西安翔迅科技有限责任公司 | One kind being based on numerically controlled engine import/exhaust door actuator emulation component system and method |
| CN114660957A (en) * | 2022-04-06 | 2022-06-24 | 北京蓝天航空科技股份有限公司 | Redundancy RVDT excitation simulation equipment and method for exciting flight control system |
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| CN109656152A (en) * | 2018-12-25 | 2019-04-19 | 西安翔迅科技有限责任公司 | One kind being based on numerically controlled engine import/exhaust door actuator emulation component system and method |
| CN114660957A (en) * | 2022-04-06 | 2022-06-24 | 北京蓝天航空科技股份有限公司 | Redundancy RVDT excitation simulation equipment and method for exciting flight control system |
| CN114660957B (en) * | 2022-04-06 | 2024-01-26 | 北京蓝天航空科技股份有限公司 | Redundancy RVDT excitation simulation equipment and method for exciting flight control system |
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