RU2615850C1 - Control-testing complex for autopilot checking - Google Patents

Abstract

FIELD: measuring equipment.

SUBSTANCE: control and testing system to check autopilot comprises a personal computer configured with software, which inputs and outputs connected to the command input unit, and information display unit with the reference voltages and the measuring unit. Reference voltages unit serving to generate a predetermined voltage amplitude, frequency and phase output is connected by a measuring unit which comprises measuring modules of the same type are interchangeable, amplifier module and secondary power sources, and serves to generate electrical signals and measuring the response signals control object. The measuring unit is connected to the inputs and outputs of the device through the switching and signal conditioning with the object of control, in addition, to create a predetermined angle of the shaft rotation sensor monitoring object contains complex installation swivel connected to a personal computer via the management module.

EFFECT: establishment of the control and verification of the complex to carry out inspections of the helicopter autopilots and its constituent elements in semi-automatic mode, which increases the reliability and validity of the results of due diligence test equipment parameters in all modes of operation, the possibility of semi-automatic checks.

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Description

The invention relates to measuring equipment, and in particular to devices for performing checks and adjusting the autopilot of a helicopter, in particular the autopilot AP-34B and the components of an autopilot.

Currently, the control and measurement of the parameters of the electro-hydraulic autopilot of the helicopter and the components of the autopilot are carried out at specialized stands, in accordance with current methods.

A device for checking the quality of operation of autopilots is known (patent No. 2181681, 1999, patent holder of the State Unitary Enterprise "Instrument Design Bureau"). The known solution describes a device for implementing a method for checking the quality of the operation of the steering unit and the autopilot of guided projectiles, based on measuring the time of the equivalent delay of the steering gear or autopilot in certain conditions. The measured parameter during verification is the angle of rotation of the rudders. Information is removed from the actuator of the system - the steering drive, and the device provides the supply of test electrical signals to the system, the functioning of the actuator (pneumatic system) and creates mechanical loads for it. The disadvantage of this solution is that it is designed to record only one of the characteristics of the automatic control system.

The closest, taken as a prototype, is the calibration apparatus PAA 34B. Operating Instructions 6C1.410.000 I (see http://aireo.ucoz.ru/publ/2-l-0-15), designed to test and adjust the units and the autopilot kit AP-34B in a helicopter, in a laboratory and in an aircraft workshop . The equipment includes a control panel for checking compensation sensors and angular velocity sensors, a control unit for controlling the control unit and autopilot AP-34B, a control panel for checking the control unit and autopilot AP-34, a control panel for checking the height corrector KV-P, an adapter, an arm that verify the parameters of individual units and autopilot complex. The disadvantage of this equipment is the high complexity of the verification process, the significant dimensions of the installation for verification, as well as low measurement accuracy due to the influence of the human factor and the use of obsolete equipment.

Taking into account the significant range of equipment under test and taking into account that the known test benches and test equipment are designed to perform manual checks, it takes a long time to carry out checks during routine maintenance, requires highly qualified personnel, as well as significant production facilities for organizing workplaces.

The objective of the claimed solution is to increase the accuracy of measurements, reducing the complexity and time of verification.

This goal is achieved due to the fact that the control and verification complex for checking the autopilot is made containing a personal computer with software, which is connected to the input command and display unit with inputs and outputs, with a reference voltage unit and a measuring unit, and a reference voltage unit , which serves to generate voltages of a given amplitude, frequency and phase, is connected at the output to a measuring unit, which contains the same type of interchangeable measuring modules, mode l amplifiers and secondary power sources and serves to create electrical signals and measure the response signals of the control object, while the measuring unit is connected at the inputs and outputs through the switching device and normalize the signals with the control object, in addition, to create a given angle of rotation of the shaft of the sensor of the control object the complex contains a rotary installation connected to a personal computer through a control module. And also due to the fact that it additionally contains a pressure controller with a pump, which serves to create the required barometric pressure in the air system of the object of control.

The technical result of the solution is to increase the reliability and accuracy of the results of a comprehensive check of the parameters of the equipment under test in all operating modes, reducing the complexity and time of testing, the possibility of conducting semi-automatic checks, which is achieved by creating a control and verification complex for conducting checks of the helicopter’s autopilots and its components semi-automatic mode. The claimed control and verification complex by means of mathematical software that implements the operation algorithm using a database of tests, in accordance with the technical conditions for the object of verification, generates a set of signals. Each set of test signals corresponds to a set of reference signals at the outputs of the test objects. The implementation of the measuring unit from the same type of interchangeable measuring modules increases its manufacturability, maintainability and reliability characteristics, due to the reduction of the time to search for failure and, consequently, the downtime of the test complex. The technical result also consists in the possibility of maintaining an electronic database of inspections, expanding the list of equipment being checked. Diagnostics and verification of equipment is carried out in semi-automatic mode with the help of software, which ensures high accuracy of equipment quality control and diagnostics of its malfunctions, and also reduces the influence of the human factor on measurement accuracy and reduces the time required to verify equipment operability.

The design of the complex is made to ensure the replacement of assembly units and change their composition during installation and modernization, taking into account the requirements of production, operational and repair manufacturability, and provides aggregation and interchangeability of the product and its components, block-modular construction of systems and devices.

The claimed solution is illustrated in Fig 1.

In FIG. 1 shows a diagram of a control and verification complex for testing an autopilot.

The complex includes an industrial computer 1, a measuring unit 2, a reference voltage unit 3, a signal switching and normalization device 5, an information display and command input unit 6, a rotary unit 7, with a rotary unit 4 control unit and a pressure controller with a pump 8.

The control and verification complex is a combination of a control program and controlled devices that ensure the conditions for testing a test object (AP-34B autopilot). The complex generates electrical, barometric, and mechanical test signals according to predefined algorithms and records the responses of the control object.

An industrial computer (1) serves for storing and executing a control program (algorithms for controlling the testing process and calculations), for accumulating and storing the data obtained during the test of the test object. The unit for entering commands and displaying information (6) is used for entering by the operator the commands that control the test process, as well as for providing the operator with the necessary information on the process and test results. The measuring unit (2) is used to create, on a command from an industrial computer (in accordance with the laid down algorithm), the necessary electrical signals that provide the required test conditions (measurements of autopilot parameters). And also to measure the responses of the control object. The block consists of the same type of interchangeable measuring modules, which increases its manufacturability, maintainability and reliability characteristics (by reducing the time to search for a failure and, consequently, downtime). The operating mode, the status of the inputs and outputs of the modules is set by the complex software, depending on the device being checked by the operator. The measuring unit (2) also includes an amplifier module and secondary power sources.

The signal switching and normalization device (5) is intended for bringing test signals, supply voltages to the monitoring object and for the primary conversion of response signals for subsequent measurement in the measuring unit (2).

The unit of reference voltages (3) is used to generate voltages of a given amplitude, frequency, and phase at the command of a computer for subsequent amplification in the measuring unit (2) and outputting them to the monitoring object to ensure the conditions for the tests.

A pressure controller with a pump (8) is used to create a control object (autopilot) in the air system that is required by the test conditions for barometric pressure.

The rotary installation (7) is used to create, at the command of a computer, a given angle of rotation of the shaft of the sensor sensor of the control object required by the test conditions. The control unit for the rotary installation (4) is used to convert and amplify commands from the computer going to the rotary installation (7).

The interaction of the components of the complex is carried out under the control of system and application software installed on a PC. The state of the signal lines of the interface modules, power supplies, the operating modes of the inputs and outputs are completely determined by the parameters specified by the user and the algorithms of the verification program for the corresponding OK.

The software installed on the PC allows you to perform:

- selection of the mode of operation of the complex;

- management of inspections and display of control results;

- Modeling the functioning of the equipment under test;

- control of the correct connection of the device under test;

- automatic testing of part of the complex modules;

- checking the parameters of the connected device in automated and manual modes;

- adjusting the parameters of the connected device in manual mode;

- maintaining an information base for inspections and repairs of devices;

- generation of reports on test results and their printing.

The main modes of operation of the complex are the on-board equipment verification mode and the complex verification mode using standard equipment (certification).

The principle of operation of the complex is based on the formation of input test signals for OK (voltages, pressures, rotation angles, etc.) that simulate the operation of test equipment used to verify and configure products by the manufacturer and specified in the relevant documentation and measurement of output signals from OK with integrated measuring equipment of the complex.

When performing checks, depending on the composition of the tested devices, the complex performs the following functions:

- forms the required combination of test signals;

- feeds them to device inputs;

- registers output signals from devices;

- determines the compliance of the measured values with the conditions specified in the technical documentation;

- Forms a conclusion on the state of the device being checked.

The work of the complex is built on the principle of the “machine - man” interface. The required operations and calculations occur automatically under the control of the operator. When you turn on the complex, the operating system (OS) installed on the PC is automatically loaded. After the appearance of the main form of the application, the complex is ready to work. The control object is connected to the complex using the appropriate harnesses. In the main menu of the application, select the desired menu item “Check” - “New check” to generate a new check and further perform operations with the selected OK or “Check History” to view the information entered in the database and print reports on previously performed OK checks. After selecting the “New scan” item, the data about the new scan and the devices being checked are entered into the database.

To perform a new check, the "Checks" - "New check" items are selected sequentially from the main menu, then the item containing the name of the checked OK is opened, after which the unfilled OK check tab opens, containing the names of the groups and controls of the check tab.

Commands entered by the operator from the command input and information display unit (6) are sent to computer (1) for processing, where they are converted by means of a built-in algorithm into a sequence of elementary commands for executive devices.

At the command of the computer (1), the unit for generating reference voltages (3) generates the required voltage ratings with the specified characteristics, which enter the measuring unit (2). In the measuring unit (2), the reference voltages are amplified by the computer commands (1) (by the amplifier module), divided (distributed) by the required channels and normalized in the measuring modules.

From the measuring unit (2), prepared and propagated test signals are fed to the control object through the switching and signal normalization devices (5), forming a field of the required test conditions. Secondary power supplies provide the operation of the measuring unit (2).

At the operator’s command (manual control), the pressure controller block (8) creates a barometric pressure in the air system of the control object (simulating flight altitude) to ensure the conditions for testing the control object.

At the command of the computer (1), the control unit of the rotary installation (4) generates control actions for the rotary installation (7), which creates a test signal for the control object in the form of the angle of the shaft of the sensor of the control object.

The response of the control object to input actions (electrical signals) is supplied to the switching and signal normalization devices (5), where the primary signal transformations are performed.

The converted signals from the switching device and normalization of signals (5) enter the measuring unit (2) for measuring, digitizing and secondary transformations, forming a data field (characteristics of the state of the control object).

The data converted into digital form from the measuring unit (2) is sent to the computer for storage, conversion and calculation according to the built-in algorithms, as well as for displaying to the operator in block 6. The data received from the computer (1) is displayed on block 6, forming an information field the operator.

The design of the complex ensures the stable placement of the objects of control during inspections in accordance with the design documentation using supports, lodges or, if necessary, brackets (see Appendix 2 - extract from the Operation Manual).

Inspection Examples

Checking the control unit includes checking the currents of consumption on the AC supply circuits, checking the voltage at the output of the rectifiers, checking the direction of the output signals, checking the values of the residual signal, checking the gain, checking gear ratios for angular speed, checking gear ratios for angle and height. The actual values of the parameters obtained as a result of the verification should correspond to the parameters of the scientific and technical progress. If the actual parameter values deviate from the NTP, OK repair is carried out in the conditions of the manufacturer or service center.

If when checking the values of the residual signal, the amplification factors along the DOS circuit, gear ratios by angular velocity and gear ratios by angle and height, the actual values of the parameters obtained as a result of the check do not correspond to the parameters of the NTP, then the potentiometer adjusts the corresponding channel.

If the adjustment of the parameter fails, OK is recognized as faulty and must be repaired in the conditions of the manufacturer or the service center.

Checking the control panel (PU) includes checking the reliability of contacting, checking the health of the signal lamps and remote shutdown of the AP, checking the operation of the PU during a turn, checking the phases of the voltage of the output signal from the rotor of the selsyn receiver, checking the matching speed, checking the residual signal and the dependence of the output signal from the mismatch angle, checking the operation of the centering knobs and checking the consumption currents through the DC and AC power circuits. When checking the operation of the control panel during a turn, press the "+ 30 °" button, while the indicator shows the current voltage value. Press the “U-turn” button and visually make sure that: the “Direction” scale of the control unit has turned several turns (control unit in the matching mode); the “on voltage” lamp of the control panel remained on; the “ON N” indicator is off. Squeeze the “U-turn” button, the “ON N” indicator should turn on. If the operation of the scale, lamp and indicator corresponds to the scientific and technical standards, put the mark “FIRST” in the corresponding fields of the check table.

Checking the compensation sensor includes checking the reliability of contacting, checking the parameters when applying the rated AC voltage to the stator winding, checking the phase of the voltage at the output of the CD.

In the course of checking the reliability of contacting, check the parameter “Resistance at the contacts.” When you press the “Forward” button, the UPDP rotates the CD shaft, the time-resistance indicator builds the dependence of resistance on time. The values of the parameters obtained as a result of the check are automatically compared with NTP parameters.

Checking the parameters when applying the rated AC supply voltage to the stator winding is carried out in three positions: at an angle of rotation of the shaft by 0 °, -30 ° and + 30 °. Press the control buttons UPDP "<" or ">" until the minimum voltage on the indicator is reached, compare the obtained value with the NTP. Visually assess the coincidence of the marks on the limb and the body. If there is a gap between the risks, the control object requires repair. Similarly, they check the phase of the voltage at the output of the CD.

Checking the zero indicator includes checking the starting current of the moving parts, checking the current of the complete deviation of the moving parts, checking the arrows to not return to zero, checking the polarity when applying test signals, checking the settling time of the moving parts, checking the balance of the moving parts.

To conduct the test, fix the zero indicator (ID) on the bracket of the rotary zero indicator (not shown).

When checking the starting current, the IN current is changed in the direction of decreasing or increasing until the IN index is started and the readings for each channel are taken. The total deviation current is checked at the total deviation current at the maximum value and at the current full deviation at the minimum value. The obtained values of the parameters are compared with the parameters of the NTP and make a conclusion about the state of OK. The directions of deviation of the index of ID should correspond to a virtual indicator. If the actual values of the parameters deviate from the STP or the directions do not match, perform OK repair.

At the same time as checking the total deviation current, it is possible to carry out a polarity check.

The arrows non-return to zero are checked from the maximum and minimum values, while for each channel, the current current value and the deviation of the index of the tested ID channel corresponding to the STP are taken. Visually evaluate the non-return index by 0 and compare with the parameters of the NTP.

To check the settling time of the moving parts, press the TIMER button when the index reaches zero. The settling time for each channel is entered in the checklist.

The balance of the moving parts is checked for tilts back and forth, to do this, loosen the screw, tilt the IN by an angle of + 45 ° (-45 °), turning the ring, visually evaluate the deviation of the scale indices from the zero position, compare the obtained values with the NTP. If the parameter corresponds to the NTP, put a mark in the fields "FACTORY" of the check table. Similarly, check the balance of the moving parts of the ID when tilting left-right.

Checking the ready signal block (BSG) includes checking the issuance of the ready signal in the absence of an input signal and the absence of control signals, checking the issuance of the ready signal in the absence of an input signal and supplying a +27 V control signal in the "program start" mode or in the "on" mode correction ", checking the issuance of the ready signal when an input signal of any value in the range from 0 to 30 V and applying a control signal of +27 V in the" Enable correction "mode, checking the removal of the ready signal when applying The output signal 9 ± 20% and the absence of control signals, by removal of the ready signal when the input signal applying 2.5 In ± 25% in the "Program Enable" and by removing the ready signal if no power "= 27".

Autopilot testing includes checking current consumption on supply circuits, checking polarity of output signals, checking operation of the zero indicator, checking operation during a U-turn, checking operation of buttons, checking at low and high voltage, checking the residual signal in matching mode, checking gain by feedback signal, checking gear ratio by angle, checking deadband by angle, checking gear ratio by height, checking deadband by height, checking ku gear ratios of the angular velocity by the rate matching.

The claimed control and verification complex allows for objective monitoring of the AP-34B autopilot and its components, while increasing accuracy, reducing the complexity and cost of control, does not require the use of expensive and bulky instruments and equipment. The control and verification complex is an automated device for monitoring and measuring the parameters of the autopilot and monitors and measures all the necessary parameters of the equipment under test in a semi-automatic mode in accordance with the applicable regulatory documents, collects, processes, accumulates and stores the results of checks, displays the results of checks, maintains a database of to each tested device. All measured values using the software for each type of device are stored in a database for this type of device and can be used to verify its operability during operation.

Claims (2)

1. A control and verification complex for checking an autopilot, comprising a personal computer with software that is connected to the input command and display unit, the reference voltage unit and the measuring unit at the inputs and outputs, and the reference voltage unit, which serves to generate the specified voltage amplitude, frequency and phase, connected at the output to the measuring unit, which contains the same type of interchangeable measuring modules, the amplifier module and secondary power sources and serves I create electrical signals and measure the response signals of the control object, while the measuring unit is connected at the inputs and outputs through the switching device and normalize the signals with the control object, in addition, to create a given angle of rotation of the shaft of the sensor of the control object, the complex contains a rotary unit connected to a personal computer through the control module. 2. The complex according to claim 1, characterized in that it further comprises a pressure controller with a pump, which serves to create the required barometric pressure in the air system of the object.

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