CN108170128B - LVDT input/output characteristic simulation device, LVDT input/output characteristic simulation method and LVDT input/output characteristic simulation module - Google Patents
LVDT input/output characteristic simulation device, LVDT input/output characteristic simulation method and LVDT input/output characteristic simulation module Download PDFInfo
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- CN108170128B CN108170128B CN201711466488.7A CN201711466488A CN108170128B CN 108170128 B CN108170128 B CN 108170128B CN 201711466488 A CN201711466488 A CN 201711466488A CN 108170128 B CN108170128 B CN 108170128B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
Abstract
The invention relates to a simulation device, a simulation method and a simulation assembly of input and output characteristics of an LVDT (linear variable differential transformer), which comprise a simulation algorithm unit and a simulation circuit unit, wherein the simulation algorithm unit comprises an Industrial Personal Computer (IPC), the IPC comprises a simulation output card and a software algorithm, and the simulation circuit unit comprises a first multiplier, a second multiplier, a first operational amplifier and a second operational amplifier; the analog quantity signal V1 of the analog output card is connected with the input end of a first multiplier, the other path of analog quantity signal V2 is connected with the input end of a second multiplier, and an alternating current excitation power supply is connected into the first multiplier and the second multiplier to be used as excitation. The invention realizes the input and output characteristics of the LVDT by an analog circuit mode and a software programming mode, and solves the technical problem that the LVDT required by the test of the existing controller is inconvenient to obtain.
Description
Technical Field
The invention relates to the technical field of LVDT, in particular to a LVDT input and output characteristic simulation device.
Background
The LVDT is a displacement sensor, an actuator with the LVDT and a controller form a set of complete system, the controller is developed and produced, the performance of the controller must be tested through testing equipment, the LVDT is indispensable when the controller tests, but the problem is often encountered during the test, the controller is produced, but the LVDT matched with the controller is not in place, and the testing time of the controller is delayed.
Disclosure of Invention
In order to solve the technical problem that the LVDT required by the existing controller test is inconvenient to obtain, the invention provides a simulation device, a simulation method and a simulation assembly for the input and output characteristics of the LVDT.
The technical solution of the invention is as follows:
the LVDT simulation device of the invention is characterized in that:
the simulation system comprises a simulation algorithm unit and a simulation circuit unit, wherein the simulation algorithm unit comprises an industrial personal computer, the industrial personal computer comprises a simulation output card and a software algorithm, and the simulation circuit unit comprises a first multiplier, a second multiplier, a first operational amplifier and a second operational amplifier;
the software algorithm is as follows:
the analog output card outputs corresponding analog quantity signals V1 and V2 according to a software algorithm;
the analog quantity signal V1 of the analog output card is connected with the input end of a first multiplier, the other path of analog quantity signal V2 is connected with the input end of a second multiplier, an AC excitation power supply is connected into the first multiplier and the second multiplier to be excited, the first operational amplifier and the second operational amplifier are respectively connected with the output ports of the first multiplier and the second multiplier, the amplification factor of the first operational amplifier and the amplification factor of the second operational amplifier are the reciprocal of the multiplication factor of the multipliers, the output ends of the first operational amplifier and the second operational amplifier are used as two output ends of the LVDT, and the ground of the analog output card is used as the center contact GND of the LVDT.
Further, the software adopts upper computer labview software.
Further, the analog output card is a PCI analog output card.
The use of labview and PCI analog output cards is a common approach. Other ways may be substituted.
The invention discloses a method for simulating input and output characteristics of an LVDT, which is characterized by comprising the following steps: the method comprises the following steps:
1) generates an analog quantity signal V1 and an analog quantity signal V2,
2) the analog quantity signal V1 and the alternating current excitation signal are sent to a first multiplier, the first multiplier generates a first output signal, the phase of the output signal is the same as that of the alternating current excitation signal, and the amplitude of the output signal is the amplitude of the output signal Va of one output end of the LVDT multiplied by the gain of the first multiplier;
the analog quantity signal V2 and the alternating current excitation signal are sent to a second multiplier, the second multiplier generates a second path of output signal, the phase of the output signal is the same as that of the alternating current excitation signal, and the amplitude of the output signal is obtained by multiplying the amplitude of the output signal Vb at the other output end of the LVDT by the gain of the second multiplier;
3) the output signals of the first multiplier and the second multiplier are restored by a first operational amplifier and a second operational amplifier respectively to generate an LVDT output signal Va and another output signal Vb.
The invention relates to an analog circuit component of input and output characteristics of an LVDT, which is characterized in that: the circuit comprises a multiplier and an operational amplifier, wherein the operational amplifier comprises an amplifier chip and two matching resistors;
the multiplier comprises two groups of differential input ports, wherein one group of differential input ports is used for inputting an analog quantity signal, the other group of differential input ports is used for inputting another analog quantity signal, and the output of the multiplier is connected with the same-direction input end of the amplifier chip; the two matching resistors are used for adjusting the amplification factor of the operational amplifier, one end of one matching resistor is grounded, and the other end of the matching resistor is connected with the non-inverting input end of the amplifier chip; the other matching resistor is connected between the non-inverting input end and the output end of the amplifier, and the amplification factor of the operational amplifier is the reciprocal of the multiplication coefficient of the multiplier.
Furthermore, the multiplier adopts an AD532 chip, the amplifier chip is 0P07, the resistance value of the grounded matching resistor is 1K, and the resistance value of the other matching resistor is 10K.
Compared with the prior art, the invention has the advantages that:
1. the invention realizes the input and output characteristics of the LVDT through a simulation circuit mode and a software programming mode, can realize the simulation of the LVDTs with different excitations and different output sizes, has the input and output characteristics completely consistent with the real LVDT, flexible control and high precision, and solves the technical problem that the LVDT required by the test of the existing controller is inconvenient to obtain.
2. The analog device for the input and output characteristics of the LVDT utilizes the combination of a digital algorithm and an analog circuit, and meets the requirements that the alternating current phases of the output signal of the LVDT and the input excitation signal are the same and the amplitude is adjustable.
3. The LVDT input and output characteristic simulation device has wide application, is suitable for simulating LVDTs with different frequencies and different amplitudes, and can adjust the amplitude steplessly according to the LVDT characteristics.
4. The simulation device can simulate signal characteristics of different forms, and can simulate different working conditions, working frequencies, motion amplitudes and the like of the LVDT in a software mode.
Drawings
FIG. 1 is a block diagram of an LVDT input/output characteristic simulation apparatus according to the present invention;
FIG. 2 is a diagram illustrating a connection structure of a first multiplier and a first operational amplifier of an analog circuit unit according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a connection structure of a second multiplier and a second operational amplifier of the analog circuit unit according to the embodiment of the invention.
Detailed Description
The input and output characteristics of the LVDT are realized in an analog circuit mode and an industrial personal computer software programming mode, the LVDT with different excitations and different output sizes can be simulated, and the input characteristic of the LVDT is that the phase of an output signal is consistent with the phase of an input excitation signal; the output characteristic of the LVDT is that the amplitude of the sum of the two output ends is constant, and the amplitude of the difference of the two output ends represents displacement information and is variable.
The structure block diagram and the analog circuit diagram of the LVDT analog device provided by the invention are shown in fig. 1, fig. 2 and fig. 3.
The present invention will be described in detail below with reference to an exemplary embodiment of an LVDT input/output characteristic simulation apparatus.
For example: the characteristics of the LVDT that need to be simulated are: the excitation of the LVDT is 7Vrms, the frequency is 1800Hz, the amplitude of the output sum is 6.2Vrms, the frequency is 1800Hz, the output difference is 0-4.5 Vrms, and the frequency is 1800 Hz.
The design of the simulation algorithm unit of the invention is as follows: the simulation output uses an industrial personal computer as a platform, a PCI simulation output card is adopted, the software adopts upper computer labview software, and according to the connection of hardware and the principle that the characteristics of the LVDT (Va + Vb) are sum and difference (Va-Vb are two outputs of the LVDT), the algorithm that the software is obtained by combining the excitation power supply input of a hardware circuit multiplier is combined:
the hardware circuit design part of the invention comprises two analog circuit components: the excitation signal and the analog quantity signal V1 are input into an analog circuit component to generate an output signal Va of the LVDT; the stimulus signal and the analog quantity signal V2 are input into another analog circuit component to generate another output signal Vb of the LVDT, and the specific circuit diagram is shown in FIGS. 2-3. For convenience of description, the operational amplifier in one analog circuit element is referred to as a first operational amplifier, and the multiplier is referred to as a first multiplier, and the operational amplifier in the other analog circuit element is referred to as a second operational amplifier, and the multiplier is referred to as a second multiplier.
The excitation signals LVDT +, LVDT- (7Vrms,1800Hz) are respectively connected to the input ports X1 (signal +) and X2 (signal-) of the first multiplier U1(AD532) and the second multiplier U2(AD532) in a differential mode, and the analog quantity signal V1 and the analog quantity signal V2 of the analog output card are respectively connected to the input ports Y1 (signal +) and Y2 (signal-) of the first multiplier (AD532) and the second multiplier (AD532) in a differential mode; the output ports OUT (output +) of the first multiplier U1(AD532) and the second multiplier U2(AD532) are respectively isolated and amplified by an operational amplifier chip (OP07), the sizes of the matching resistors R3 and R5 of the first operational amplifier U3 and the matching resistors R4 and R6 of the second operational amplifier U4 are determined according to the principle of the multiplier (AD532), the amplification factors of the first operational amplifier U3 and the second operational amplifier U4 are the inverse of the multiplication factor of the multiplier, the resistances of the matching resistors R5 and R6 are 1K, the resistances of the matching resistors R3 and R4 are 10K, and the amplification factors of the first operational amplifier U3 and the second operational amplifier U4 are 10 times.
Multiplier principle:
the alternating current excitation power supply is used as an input signal of the multiplier, an output voltage signal obtained by multiplying an analog output signal and the excitation power supply are in the same phase, the relationship of the amplitude of the output voltage signal is realized by a software algorithm, and for obtaining signals with different output amplitudes, for the determined LVDT in the embodiment, the amplitude of the LVDT output difference in the algorithm is only required to be changed.
Tests prove that the alternating current phase of the output end of the LVDT input and output characteristic simulation device is completely consistent with the excitation phase and is consistent with the LVDT characteristic. The relationship between the difference value and the sum value of the LVDT in the output end and the amplitude are similar to the LVDT characteristics, and the difference is less than five thousandths.
Claims (4)
- An LVDT input-output characteristic simulation device, comprising:the simulation system comprises a simulation algorithm unit and a simulation circuit unit, wherein the simulation algorithm unit comprises an industrial personal computer, the industrial personal computer comprises a simulation output card and a software algorithm, and the simulation circuit unit comprises a first multiplier, a second multiplier, a first operational amplifier and a second operational amplifier;software algorithmComprises the following steps:
the analog output card outputs corresponding analog quantity signals V1 and V2 according to a software algorithm;the analog quantity signal V1 of the analog output card is connected with the input end of a first multiplier, the other path of analog quantity signal V2 is connected with the input end of a second multiplier, an AC excitation power supply is connected into the first multiplier and the second multiplier to be excited, the first operational amplifier and the second operational amplifier are respectively connected with the output ports of the first multiplier and the second multiplier, the amplification factor of the first operational amplifier and the amplification factor of the second operational amplifier are the reciprocal of the multiplication factor of the multipliers, the output ends of the first operational amplifier and the second operational amplifier are used as two output ends of the LVDT, and the ground of the analog output card is used as the center contact GND of the LVDT. - 2. The LVDT input-output characteristic simulation apparatus according to claim 1, wherein: the software adopts upper computer labview software.
- 3. The LVDT input-output characteristic simulation apparatus according to claim 1, wherein: the simulation output card is a PCI simulation output card.
- The LVDT input-output characteristic simulation method is characterized in that: the method comprises the following steps:1) generates an analog quantity signal V1 and an analog quantity signal V2,
2) the analog quantity signal V1 and the alternating current excitation signal are sent to a first multiplier, the first multiplier generates a first output signal, the phase of the output signal is the same as that of the alternating current excitation signal, and the amplitude of the output signal is the amplitude of the output signal Va of one output end of the LVDT multiplied by the gain of the first multiplier;the analog quantity signal V2 and the alternating current excitation signal are sent to a second multiplier, the second multiplier generates a second path of output signal, the phase of the output signal is the same as that of the alternating current excitation signal, and the amplitude of the output signal is obtained by multiplying the amplitude of the output signal Vb at the other output end of the LVDT by the gain of the second multiplier;3) the output signals of the first multiplier and the second multiplier are restored by a first operational amplifier and a second operational amplifier respectively to generate an LVDT output signal Va and another output signal Vb.
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| CN112394707A (en) * | 2020-10-30 | 2021-02-23 | 中国航发西安动力控制科技有限公司 | Circuit for simulating dynamic model of position sensor LVDT of aero-engine fuel regulator |
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