CN219694214U

CN219694214U - LVDT detection device for aircraft

Info

Publication number: CN219694214U
Application number: CN202320444130.9U
Authority: CN
Inventors: 黄炎; 王涛
Original assignee: Chengdu Kaiser Technology Co ltd
Current assignee: Chengdu Kaiser Technology Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-09-15
Anticipated expiration: 2033-03-10

Abstract

The utility model relates to the technical field of LVDT detection, in particular to an LVDT detection device for an airplane, which comprises: the signal generator output end is connected with the primary winding of the tested LVDT, the input end of the voltmeter is connected with the first secondary winding and/or the second secondary winding of the tested LVDT, the displacement sensor is used for detecting the displacement size of the metal rod of the tested LVDT, and the detection signal of the displacement sensor is input into the displacement meter. The utility model can detect single-channel or even double-channel LVDT, can obviously improve efficiency and reliability, and also reduces the requirement on personnel skills.

Description

LVDT detection device for aircraft

Technical Field

The utility model relates to the technical field of LVDT detection, in particular to an LVDT detection device for an airplane.

Background

LVDTs (Linear Var iable Differential Transformer, linear variable differential transformers) are a type of linear displacement sensor. The 1 primary winding and the 2 secondary windings of the LVDT are wound on the same cylindrical plastic framework, and the cylinder of the framework is internally provided with 1 metal rod piece which can move along the axial direction of the cylinder. When the LVDT works, alternating current with a certain frequency is required to be supplied to the primary windings, and when the metal rod moves axially, electromotive forces are respectively induced in the 2 secondary windings, so that voltage is output, and the axial position of the metal rod can be determined through the voltage. Therefore, only the stator and the metal rod are respectively fixed on two zero parts of the relative motion, and the relative position of the stator and the metal rod can be judged through the voltage output by the LVDT, and the stator mainly comprises a framework, a winding and a shell. In the testing process of the LVDT for the airplane, the LVDT needs to work normally according to the method, then the phase difference (generally, 0 degrees or 180 degrees according to design requirements) between the input alternating current signal and the output alternating current signal is confirmed, and finally the amplitude of the output alternating current signal under different displacements of the metal rod is recorded. The existing solution adopts a signal generator to provide alternating current for a primary winding, an oscilloscope is used for measuring the phase difference of input and output and the amplitude of output signals, and a vernier caliper is used for measuring the displacement of a metal rod. The scheme needs to carry out complicated connection, adjusts various equipment parameters, has low efficiency and has higher requirements on working experience and working precision of personnel. Based on the above problems, we have devised an LVDT detection device for an aircraft.

Disclosure of Invention

The utility model aims to provide an LVDT detection device for an airplane, which integrates the functions of displacement measurement, phase comparison and output amplitude measurement by arranging a phase sensitive detector, a voltmeter and a displacement meter, and judges whether signals input into the LVDT and signals output by the LVDT are in phase or not by the phase sensitive detector and an in-phase indicator lamp.

The embodiment of the utility model is realized by the following technical scheme:

an LVDT detection device for an aircraft, comprising:

the signal generator output end is connected with the primary winding of the tested LVDT, the input end of the voltmeter is connected with the first secondary winding and/or the second secondary winding of the tested LVDT, the displacement sensor is used for detecting the displacement size of the metal rod of the tested LVDT, and the detection signal of the displacement sensor is input into the displacement meter.

Optionally, the number of the voltmeters is 4, and the 4 voltmeters are respectively connected with the output signal of the first secondary winding of the tested LVDT and the output signal of the second secondary winding of the B channel.

Optionally, the device further comprises a multi-path selection switch and a phase sensitive detector, wherein the multi-path selection switch is arranged between the voltmeter and the LVDT, and the output end of the multi-path selection switch is connected with the input end of the phase sensitive detector.

Optionally, the device further comprises an indicator light, and the indicator light is connected with the phase-sensitive detector.

Optionally, when any two signals in the first secondary winding and/or the second secondary winding are in phase, the indicator light is turned on.

Optionally, the device further comprises an external interface, wherein the external interface is used for externally connecting a data acquisition card.

Optionally, the voltmeter and the displacement meter can convert the output signals into direct current signals, and the output ends of the voltmeter and the displacement meter are connected with the external interface.

Optionally, the system further comprises a power supply module, wherein the power supply module is used for supplying power to the signal generator, the amplifier, the voltmeter, the displacement meter and the phase-sensitive detector.

The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

according to the embodiment, the functions of displacement measurement, phase comparison and output amplitude measurement are integrated and designed through the arrangement of the phase-sensitive detector, the voltmeter and the displacement meter, meanwhile, whether signals input into the LVDT and signals output by the LVDT are in-phase or not is judged through the phase-sensitive detector and the in-phase indicator lamp, the wiring mode of the device is simple and convenient, single-channel or even double-channel LVDT can be detected, and compared with an old scheme, the efficiency and the reliability are obviously improved, and the requirement on personnel skills is reduced.

Drawings

FIG. 1 is a schematic diagram of an LVDT detection device for an aircraft according to the present utility model;

fig. 2 is a schematic diagram of a tested LVDT of the LVDT detection device for an aircraft according to the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

As shown in fig. 1 and 2, the present utility model provides one of the embodiments: an LVDT detection device for an aircraft, comprising:

In a specific application of this embodiment, the signal generator may generate tuning signals of different waveforms (e.g., sine wave, square wave, triangular wave), frequencies and amplitudes, typically tuned to a sine wave signal at an intermediate frequency during testing of the LVDT. Since the power of the signal generator is generally not large, a power amplifier is connected to the output end of the signal generator to amplify the amplitude of the signal. The output signal of the amplifier is directly output to the primary winding of the external detected LVDT through the interface on the panel. The displacement meter is matched with an external displacement sensor, the displacement size of the metal rod of the detected LVDT can be accurately measured and displayed in real time, and the functions of displacement measurement, phase comparison and output amplitude measurement are integrated and designed by arranging the phase sensitive detector, the voltmeter and the displacement meter.

In this embodiment, the number of voltmeters is 4, and the 4 voltmeters are respectively connected with the output signal of the first secondary winding of the tested LVDT and the output signal of the second secondary winding of the B channel.

In a specific application of this embodiment, the pole coils of the LVDT detected in fig. 1 output 4 ac signals, where AV1, AV2 are the output signals of the 2 secondary coils of the a channel and BV1 and BV2 are the output signals of the 2 secondary coils of the B channel. That is, the present utility model can measure not only single channel LVDTs but also dual channel LVDTs. The 4 signals are respectively input to the 4 voltmeters through interfaces on the panel, so that the amplitude of the output signal is directly displayed.

In this embodiment, the device further includes a multi-path selection switch, and a phase sensitive detector, where the multi-path selection switch is disposed between the voltmeter and the LVDT, and an output end of the multi-path selection switch is connected to an input end of the phase sensitive detector.

The signals AV1, AV2, BV1 and BV2 input into the device are input into the phase sensitive detector through a multiplexing switch.

In this embodiment, the device further comprises an indicator light, and the indicator light is connected with the phase-sensitive detector.

In this embodiment, the indicator lights are turned on when any two signals in the first secondary winding and/or the second secondary winding are in phase.

The phase sensitive detector also receives the primary electrical signal from the amplifier and compares the phases of the two signals to each other. When the two are in phase, the indicator light will be on.

In this embodiment, the device further includes an external interface, where the external interface is used to externally connect to the data acquisition card.

In this embodiment, the voltmeter and the displacement meter may convert the output signals into direct current signals, and the output ends of the voltmeter and the displacement meter are connected with the external interface.

The voltmeter has an output function, and can convert the amplitude of the measured alternating current signals of AV1, AV2, BV1 and BV2 into direct current signals, output the direct current signals to an interface of the equipment panel for the data acquisition card externally connected with the equipment to acquire.

In this embodiment, the device further comprises a power module for supplying power to the signal generator, the amplifier, the voltmeter, the displacement meter and the phase sensitive detector.

The power supply module converts the mains supply of 50Hz and 220V into electric energy in a required form so as to supply power for the signal generator, the amplifier, the voltmeter, the displacement meter and the phase-sensitive detector.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An LVDT detection apparatus for an aircraft, comprising: the signal generator output end is connected with the primary winding of the tested LVDT, the input end of the voltmeter is connected with the first secondary winding and/or the second secondary winding of the tested LVDT, the displacement sensor is used for detecting the displacement size of the metal rod of the tested LVDT, and the detection signal of the displacement sensor is input into the displacement meter.

2. The device according to claim 1, wherein the voltage meters are 4, and the 4 voltage meters are respectively connected with the output signal of the first secondary winding of the tested LVDT and the output signal of the second secondary winding of the B channel.

3. The device according to claim 1, further comprising a multiplexing switch and a phase sensitive detector, wherein the multiplexing switch is arranged between the voltmeter and the LVDT, and an output end of the multiplexing switch is connected with an input end of the phase sensitive detector.

4. An LVDT detection device for an aircraft according to claim 3, further comprising an indicator light connected to the phase sensitive detector.

5. The LVDT detection device for an aircraft of claim 4, wherein the indicator lights are turned on when any two of the signals in the first secondary winding and/or the second secondary winding are in phase.

6. The LVDT detection apparatus for an aircraft of claim 5, further comprising an external interface, the external interface configured to externally connect to a data acquisition card.

7. The LVDT detection apparatus for an aircraft according to claim 6, wherein the voltmeter and the displacement meter are both capable of converting output signals into dc signals, and output ends of the voltmeter and the displacement meter are both connected to the external interface.

8. The LVDT detection device for an aircraft of claim 5, further comprising a power module for powering the signal generator, the amplifier, the voltmeter, the displacement meter, and the phase sensitive detector.