CN105865323A - Calibrator for angular displacement sensor - Google Patents

Abstract

The invention belongs to the field of aircraft avionics testing, and in particular relates to an angular displacement sensor calibrator, which is used for calibrating the angular displacement sensor. At present, during the final assembly of the control stability augmentation system, the installation of the sensor only performs mechanical zero calibration, and there is no electrical zero calibration capability. And it does not have the ability to verify the sensor before installation. The technical problem to be solved by the present invention is to realize a kind of electrical zero calibration for the installation of roll position sensor, pitch position sensor, pedal position sensor and collective distance position sensor of the control stability augmentation system, and can also control the basic performance of the sensors. The detection further ensures the reliability of the sensor before installation and effectively improves the control accuracy of the control stability augmentation system.

Description

Calibrator for angular displacement sensor

technical field

The invention belongs to the field of aircraft avionics testing, and in particular relates to an angular displacement sensor calibrator, which is used for calibrating the angular displacement sensor.

Background technique

The roll position sensor, pitch position sensor, pedal position sensor, and collective distance position sensor in the control stability augmentation system are used to sense the displacement changes of the yaw cycle stick and the yaw pedals. The sensor is composed of a double-connected linear potentiometer, a housing assembly, a rocker assembly, a fixed plate assembly, and a socket. The rocker arm of the sensor is connected with the bar system of the control stabilization system. The range of motion of the rocker arm is 50°±2°. The displacement of the rocker arm after rotation will be converted into a DC voltage signal output, and the scale factor is 0.3V/° (accuracy ±0.5 %). These DC voltage signals are differentially processed by the console of the control and stabilization system, and then output to the control and stabilization computer for functional control of the helicopter's pitch, roll, heading and total pitch.

When connecting the sensor to the helicopter control stability augmentation system, not only the mechanical zero position calibration, but also the electrical zero position calibration must be performed. The mechanical zero position is to connect the through hole on the sensor rocker arm with the hole on the sensor housing with screws, and the two holes correspond to each other so that the sensor is placed at the mechanical zero position. After mechanical zero calibration, if the output voltage value of the measuring sensor potentiometer is not 0V, it is necessary to adjust the potentiometer on the sensor to perform electrical zero calibration.

At present, during the final assembly of the control stability augmentation system, the installation of the sensor only has a mechanical zero calibration, and there is no electrical zero calibration capability. And it does not have the ability to verify the sensor before installation.

Contents of the invention

The technical problem to be solved by the present invention is to realize a kind of electrical zero calibration for the installation of roll position sensor, pitch position sensor, pedal position sensor and collective distance position sensor of the control stability augmentation system, and can also control the basic performance of the sensors. The detection further ensures the reliability of the sensor before installation and effectively improves the control accuracy of the control stability augmentation system.

The angular displacement sensor calibrator of the present invention, the calibrator includes input interfaces J1, J2 on the panel socket, the interface J1 is used to connect with the corresponding terminal of a potentiometer output end of the angular displacement sensor, and the interface J2 is used to connect with the other terminal of the angular displacement sensor The corresponding terminal of the output end of a potentiometer is connected; the input interfaces J1 and J2 are connected in parallel with the front stage of the three-pole double-throw potentiometer selection switch S3 in the calibrator, so as to realize the switching and selection of the two potentiometers inside the angular displacement sensor ; The first and second output ports of the rear stage of the three-pole double-throw potentiometer selection switch S3 are connected to the double-pole double-throw voltage/resistance selection switch S2, and the third output port is divided into two routes, one of which is connected to the test terminal TESTB on the panel Connect, the other way is grounded after passing through the voltmeter M1; the first output port of the voltage/resistance selection switch S2 is connected with the light bulb L1, the fuse F1, the power switch S1 and the 15V power supply in turn, and the second output port is connected with the test terminal TESTA on the panel , the third output port is connected to the -15V power supply, and the fourth output port is connected to the test terminal TESTC; the function switching between voltage test and resistance value test is realized through the voltage/resistance selection switch S2.

Further, the calibrator is used to calibrate the installed electrical zero position of the angular displacement sensor, the sensor is placed at the mechanical zero position, the power switch S1 is turned on, the voltage/resistance selection switch S2 is placed at the pull-up position, and the voltmeter M1 indicates the sensor If the voltage value of point B does not meet the requirements, adjust it by adjusting the potentiometer knob on the sensor;

Further, the power switch S1 is turned off, the voltage/resistance selection switch S2 is placed in the pull-down position, and by detecting the resistance between TESTA and TESTC, the effective working total resistance of the angular displacement sensor is obtained, and the test terminals TESTA and TESTB are detected When the rocker arm of the angular displacement sensor is rotated counterclockwise, if the resistance drops, it means the polarity is correct.

Further, adjust the dual-channel DC regulated power supply to ±15V, and connect it to the +15V, GDN, -15V power supply terminals of the tester, then put the voltage/resistance selection switch S2 in the pull-up position, and turn on the power switch S1 , step by step to rotate the rocker arm of the sensor, record and calculate the linearity of the output.

The beneficial effects of the present invention are: when controlling the final assembly of the stability augmentation system, the electric zero position calibration of the roll position sensor, the pitch position sensor, the pedal position sensor and the collective distance position sensor is realized. At the same time, it can detect the basic performance of the sensor, effectively reduce the onboard failure rate, and improve the system maintainability. The calibrator is simple and intuitive in design, reliable in application and strong in practicability.

Description of drawings

Fig. 1 is the angular displacement sensor calibrator panel of the present invention;

Fig. 2 is the circuit principle of the angular displacement sensor calibrator of the present invention;

M1 DC voltmeter; J1, J2 tester and sensor adapter cable connection socket; S1 power switch; S2 voltage/resistance selection switch; S3 potentiometer selection switch; TESTA, TESTB, TESTC resistance test terminals; +15V, GND, - 15V power supply terminal; F1 fuse; L1 power indicator light

detailed description

Example

An angular displacement sensor calibrator is invented, which can detect the effective working total resistance of the sensor, the linearity of the double potentiometer, and the polarity performance of the sensor, and realize electrical zero calibration. See attached drawing 2 for circuit details. The sockets J1 and J2 of the tester correspond to the electrical interfaces of the sensor plugs J01 and J02 respectively.

A1, B1, and C1 of the J1 socket are respectively connected to terminals 1-1, 3-1, and 2-1 of the potentiometer selection switch S3 (three-pole double-throw); A2, B2, and C2 of the J1 socket are respectively connected to the potentiometer selection switch The 1-2, 3-2, and 2-2 terminals of S3 (three-pole double-throw) are connected, and the selection and switching of potentiometer 1 and potentiometer 2 are realized through the potentiometer selection switch S3 (three-pole double-throw).

Terminals 1 and 2 of the potentiometer selection switch S3 (three-pole double-throw) are connected to terminals 1 and 2 of the voltage/resistance selection switch S2 (double-pole double-throw).

Terminal 3 of the potentiometer selection switch S3 (three-pole double-throw) is connected to the pointer voltmeter M1, and the other terminal of the voltmeter M1 is connected to the GND terminal. The output voltage value of the sensor can be detected through the voltmeter M1, and the linearity test and electrical zero point calibration of the double potentiometer can be realized.

Terminals 1-2 and 2-2 of the voltage/resistance selection switch S2 (Double Pole Double Throw) are connected to the test terminals TESTA and TESTC, and terminal 3 of the potentiometer selection switch S3 (Triple Pole Double Throw) is connected to the test terminal TESTB. Through the test terminals TESTA, TESTB, and TESTC, the effective working total resistance of the sensor and the polarity detection of the sensor can be realized. The 1-1 end of the voltage/resistance selection switch S2 (double pole double throw) is connected to the +15V power supply terminal through the power indicator light L1, the fuse F1 (2A), the single pole single throw switch S1; the voltage/resistance selection switch S2 (double pole Double-throw) terminal 2-1 is connected to the -15V power supply terminal.

The specific detection steps are as follows

(1) Effective working total resistance

Connect J01, J02 of the sensor to J1, J2 of the tester with the transfer cable.

Put the voltage/resistance selection switch S2 (double pole double throw) on the lower side 1-2, 2-2 position, corresponding to the "resistance" position on the panel; put the potentiometer selection switch S3 (three poles double throw) on the upper side Side 1-1, 2-1, 3-1 positions correspond to the "Potentiometer 1" position on the panel.

Use a multimeter or an ohmmeter with an accuracy of not less than 0.5 to connect the test terminals TESTA and TESTC, and measure the total resistance between the sensor pins A1 and C1 to be 5KΩ±10%.

Put the potentiometer selection switch S3 (three poles double throw) on the upper side 1-2, 2-2, 3-2 position, corresponding to the "potentiometer 2" position on the panel, measure the distance between the sensor pins A2 and C2 The total resistance should be 5KΩ±10%.

(2) Polarity test of the sensor

Connect J01, J02 of the sensor to J1, J2 of the tester with the transfer cable.

Put the voltage/resistance selection switch S2 (double pole double throw) on the lower side 1-2, 2-2 position, corresponding to the "resistance" position on the panel; put the potentiometer selection switch S3 (three poles double throw) on the upper side Side 1-1, 2-1, 3-1 positions correspond to the "Potentiometer 1" position on the panel.

Use a multimeter or an ohmmeter with an accuracy of not less than 0.5, connect the test terminals TESTA and TESTB, rotate the rocker arm counterclockwise (viewed from the shaft end of the potentiometer), and observe that the resistance between pins A1 and B1 in the two sockets of the sensor should drop , indicating correct polarity.

Put the potentiometer selection switch S3 (three poles double throw) on the upper side 1-2, 2-2, 3-2 position, corresponding to the "potentiometer 2" position on the panel, and measure the pins A2 and B2 in the two sockets of the sensor The resistance between should drop, indicating correct polarity.

(3) Linear performance of double potentiometer

Clamp the sensor on the turntable with a special fixture so that the axis of the sensor potentiometer is coaxial with the indexing axis of the turntable.

Connect J01, J02 of the sensor to J1, J2 of the tester with the transfer cable.

Adjust the dual-channel DC regulated power supply to ±15V, and connect it to the +15V, GDN, and -15V power supply terminals of the tester.

Put the voltage/resistance selection switch S2 (double pole double throw) on the upper side 1-1, 2-1 position, corresponding to the "voltage" position on the panel; put the potentiometer selection switch S3 (three poles double throw) on the upper side Side 1-1, 2-1, 3-1 positions correspond to the "Potentiometer 1" position on the panel.

Turn on the power switch S1, the indicator light L1 is on.

Rotate the rocker arm of the sensor to a position of -50° (counterclockwise is negative), observe and record the output voltage value of B1 terminal displayed by the voltmeter M1 at this time, and then measure and record the output voltage value every 10° until the rocker arm turns to 50°, the calculated linearity of its output should be ±0.5%.

Turn off the power switch S1, and the indicator light L1 goes out.

Put the potentiometer selection switch S3 (three poles double throw) on the upper side 1-2, 2-2, 3-2 position, corresponding to the "potentiometer 2" position on the panel.

Turn on the power switch S1, the indicator light L1 is on.

Rotate the rocker arm of the sensor to a position of -50° (counterclockwise is negative), observe and record the output voltage value of terminal B2 displayed by the voltmeter M1 at this time, and then measure and record the output voltage value every 10° rotation until the rocker arm turns to 50°, the calculated linearity of its output should be ±0.5%.

(4) Electrical zero calibration

Put the power switch S1 in the off position; put the voltage/resistance selection switch S2 (double pole double throw) in the upper side 1-1, 2-1 position, corresponding to the "voltage" position on the panel.

Use an adapter cable, one end connects the cable plug on the machine (where the sensor is connected) to the tester J1, J2, and the other end connects the tester J1, J2 to the sensor J01, J02.

Put the sensor at mechanical zero.

Turn on the power on the machine. The power switch S1 is placed in the off position.

Observe the voltmeter M1 to indicate that the voltage value should be 0V±0.5%, if not, adjust the potentiometer knob on the sensor to meet the requirements.

Turn off the power switch S1, disconnect the power supply on the machine, and disconnect the connecting cables. Restore the sensor on-board connection.

Claims (4)

1. A kind of angular displacement sensor calibrator, it is characterized in that: this calibrator comprises input interface J1, J2 on the panel socket, interface J1 is used for being connected with the corresponding terminal of a potentiometer output end of angular displacement sensor, and interface J2 is used for connecting with The corresponding terminal of the other potentiometer output end of the angular displacement sensor is connected; the input interface J1, J2 is connected in parallel with the front stage of the three-pole double-throw potentiometer selection switch S3 in the calibrator, and realizes two inside the diagonal displacement sensor. The potentiometer (1, 2) is used for switching selection; the first and second output ports of the rear stage of the three-pole double-throw potentiometer selection switch S3 are connected to the double-pole double-throw voltage/resistance selection switch S2, and the third output port is divided into two circuits , one of which is connected to the test terminal TESTB on the panel, and the other is grounded after passing through the voltmeter M1; the first output port of the voltage/resistance selection switch S2 is connected with the light bulb L1, the fuse F1, the power switch S1 and the 15V power supply in sequence, and the second The output port is connected to the test terminal TESTA on the panel, the third output port is connected to the -15V power supply, and the fourth output port is connected to the test terminal TESTC; the function switching between voltage test and resistance value test is realized through the voltage/resistance selection switch S2. 2. The angular displacement sensor calibrator according to claim 1, characterized in that: the calibrator is used to calibrate the electrical zero position of the angular displacement sensor, the sensor is placed in the mechanical zero position, the power switch S1 is turned on, and the voltage /Resistor selection switch S2 is placed in the pull-up position, and the voltmeter M1 indicates the voltage value of point B of the sensor. If it does not meet the requirements, adjust it by adjusting the potentiometer knob on the sensor. 3. The angular displacement sensor calibrator according to claim 1, characterized in that: the power switch S1 is disconnected, the voltage/resistance selection switch S2 is placed in a pull-down position, and by detecting the resistance between TESTA and TESTC, obtain The effective working total resistance of the angular displacement sensor is to detect the resistance between the test terminals TESTA and TESTB. When the rocker arm of the angular displacement sensor is rotated counterclockwise, if the resistance drops, it indicates that the polarity is correct. 4. The angular displacement sensor calibrator according to claim 1, characterized in that: the dual-channel DC stabilized power supply is adjusted to ±15V, which is connected to the +15V, GDN, -15V power supply terminals of the tester, and then the voltage /Resistor selection switch S2 is placed in the pull-up position, the power switch S1 is turned on, the rocker arm of the sensor is rotated step by step, and the linearity of the output is recorded and calculated.