A multifunctional heating and temperature measuring system for icing test and its working method

Abstract

A multifunctional heating and temperature measurement system for icing test and its working method belong to the technical field of icing test. In order to solve the problem of integrating power control and temperature measurement into a system that can be used online or stand-alone, the present invention includes a remote control panel, an acquisition control unit, a power control unit and a model thermocouple, wherein the remote control panel is connected to the acquisition control unit via a network cable, the acquisition control unit is connected to the power control unit via cable III, the power control unit is connected to the model thermocouple via cable I, and the model thermocouple is connected to the acquisition control unit via cable II; the power control unit includes an input channel, an output channel, a cooling fan, a housing, a network interface, a programmable power supply module, a power input channel and a power output channel, and the power control unit is connected to a power supply. The present invention improves the test efficiency and meets the system versatility. At the same time, the system is easy to assemble and carry, meeting the convenience of test preparation.

Description

Technical Field

[0001] The invention belongs to the technical field of icing test, and in particular relates to a multifunctional heating and temperature measuring system for icing test and a working method thereof. Background Art

[0002] Ice on key parts of aircraft wings will cause changes in their flatness, shape and aerodynamic layout, resulting in a decrease in the aircraft's lift-to-drag ratio, a decrease in lift coefficient, and an increase in drag, which seriously endangers flight safety. In order to study the laws of wing icing and anti-icing, aircraft models must be tested for icing and anti-icing in wind tunnels or in the field, providing necessary guarantees for the development of aviation, aerospace, rail transportation and other fields. Icing and anti-icing test technologies mainly include hot air anti-icing technology and electric heating anti-icing technology. Hot air anti-icing technology uses hot air from the engine to heat the leading edge of the wing to prevent icing, but hot air anti-icing technology has high energy consumption and low efficiency, and energy is lost in the system pipelines; the hot air anti-icing system is complex, including complex pipelines, valves, anti-icing chambers and other structural designs.

[0003] With the use of composite materials on wings, electric heating anti-icing technology has also become a hot research topic. Electric heating anti-icing technology usually consists of a power supply, a power control system, a control panel, and a heating element arranged in the wing. Its working principle is: the control panel and the power control system control the output of the power supply. The power control system controls the heating time and heating power according to the switch signal, power value signal and temperature feedback signal of the heating element on the control panel, thereby converting electrical energy into thermal energy to prevent ice from forming on the leading edge of the wing. The power supply is the main component of power output; the control panel inputs and displays power value, temperature value and switch signal; the power control system performs open-loop / closed-loop control of the power output of the power supply according to the input of the control panel and the temperature feedback signal of the heating element; the heating element converts electrical energy into thermal energy.

[0004] The traditional electric heating anti-icing system is complex, and the power supply and power control system are large in size, which makes it difficult to transport during field icing tests. The power input is three-phase 380V, making it difficult to build the system. The power output is designed to be AC ​​output, which interferes with the collection of other weak signals. The power control system has a single control scheme and can only use voltage control, without considering the impact of line resistance changes with temperature. The electric heating power control unit and the temperature measurement unit are two independent systems. There are many systems that need to be prepared for the heating and temperature measurement test, and the operation of the control panel is cumbersome and complicated. During the icing and anti-icing test, the use of the traditional electric heating anti-icing system will cause errors in the test parameters, and the test preparation and test process are inefficient. Summary of the invention

[0005] The problem to be solved by the present invention is to integrate power control and temperature measurement into a system which can be used online or as a stand-alone unit, and to propose a multifunctional heating and temperature measurement system for icing test and a working method thereof.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A multifunctional heating and temperature measurement system for an icing test, comprising a remote control panel, an acquisition control unit, a power control unit and a model thermocouple, wherein the remote control panel is connected to the acquisition control unit via a network cable, the acquisition control unit is connected to the power control unit via a cable III, the power control unit is connected to the model thermocouple via a cable I, and the model thermocouple is connected to the acquisition control unit via a cable II;

[0008] The power control unit comprises an input channel, an output channel, a housing, a network interface, a programmable power module, a power input channel and a power output channel, and the power control unit is connected to a power source;

[0009] The housing of the power control unit is provided with an input channel and an output channel, the housing is provided with a programmable power module, the programmable power module is provided with a network interface, a power input channel and a power output channel, the power supply is connected with the power input channel through the input channel, and the model thermocouple is connected with the power output channel through the output channel;

[0010] An HDMI interface, a USB interface, a second network interface, a second power output channel, a temperature input channel, and a power interface are arranged on the rear side of the shell of the acquisition control unit; a main power switch, a start / stop knob, a local / remote knob, a power / temperature knob, a temperature adjustment knob, a power adjustment knob, and a display screen are arranged on the front side of the shell of the acquisition control unit; a network switch, a microcontroller, a temperature acquisition module, an analog input and output module, a digital input and output module, and a digital-to-analog conversion card are arranged in the shell of the acquisition control unit; the power interface of the acquisition control unit is connected to a power supply, the temperature input channel is connected to a model thermocouple, and the second power output channel is connected to a power control unit;

[0011] The main power switch, start / stop knob, local / remote knob, power / temperature knob in the acquisition control unit are connected to the digital input and output module, the power adjustment knob is connected to the digital-to-analog conversion card, the digital-to-analog conversion card is connected to the analog input and output module, the digital input and output module and the analog input and output module are connected to the network switch, the network switch is respectively connected to the second network interface, the temperature acquisition module, and the microcontroller, and the microcontroller is connected to the HDMI interface, the USB interface, and the display screen.

[0012] Furthermore, a heat dissipation fan is also provided on the housing of the power control unit.

[0013] Furthermore, a second cooling fan is provided on the rear side of the housing of the acquisition control unit.

[0014] A working method of a multifunctional heating and temperature measuring system for an icing test is implemented based on the multifunctional heating and temperature measuring system for an icing test, with AC power input, DC output processed by a microcontroller, heating of a heating element by adjusting voltage, current and power, temperature open-loop control by voltage control and power control, and temperature closed-loop control by combining a temperature set value and a temperature feedback value measured by a temperature sensor, including the following steps:

[0015] S1. Use a model thermocouple to collect temperature. The hot end of the model thermocouple is in contact with the temperature measuring point of the model, and a micro voltage signal is generated at both ends of the model thermocouple.

[0016] S2. The cold end of the model thermocouple is connected to the temperature acquisition module, and the micro voltage signal of the model thermocouple is received by the temperature acquisition module. The temperature acquisition module processes the signal through the cold end compensator method and obtains the actual temperature value through analog conversion;

[0017] S3. The actual temperature value measured by the model thermocouple is fed back to the microcontroller of the acquisition control unit as a feedback value. The microcontroller compares the temperature value fed back by the thermocouple with the temperature setting value, calculates the output control signal through the PID algorithm, and the programmable power module adjusts the actual power output according to the control signal to adjust the temperature, forming a closed-loop control system to achieve temperature convergence to the set value and achieve temperature closed-loop control;

[0018] ;

[0019] in, is the sampling sequence number, It is k The temperature setting value is It is k The actual temperature output value of the It is k The output control variable of the It is k The temperature deviation of It is k -1 temperature deviation, is the proportional coefficient of the PID control algorithm, is the integration time constant, is the differential time constant, T is the sampling period.

[0020] Furthermore, the calculation formula for generating a micro-voltage signal at both ends of the model thermocouple in step S1 is:

[0021] ;

[0022] in, Indicates the temperature T and T Thermoelectric potential at time 0, Indicates temperature T Thermoelectric potential at Indicates temperature T Thermoelectric potential at time 0, and Respectively represent conductors A and conductor B The Seebeck coefficient.

[0023] Furthermore, in step S2, the temperature acquisition module obtains the actual temperature value through analog conversion after processing by the cold end compensator method as follows:

[0024] ;

[0025] Formula (3) indicates that after the cold end compensation method, the cold end temperature is determined. At this time, the thermoelectric potential is a single-valued function of the measuring end temperature. It means that after obtaining the thermoelectric potential, the actual temperature of the measuring end is obtained through analog conversion.

[0026] Furthermore, in step S3, the data actually collected at a certain frequency is first filtered to prevent interference from variables. The filtering adopts the Kalman filter algorithm, and then the mean value is processed. The formula is as follows:

[0027] ;

[0028] Where t is the temperature value after data processing, t i It is i The temperature value under sampling, n is the total number of data samples.

[0029] Furthermore, the use of the multifunctional heating and temperature measuring system for icing test includes online use, stand-alone use - temperature collection, and stand-alone use - power control.

[0030] Beneficial effects of the present invention:

[0031] The multifunctional heating and temperature measuring system for icing test described in the present invention can select a combined heating and temperature measuring system for online / stand-alone use according to the actual needs of the test, with high data accuracy, high equipment integration, diversified system functions, diversified use methods and portability. The power control accuracy reaches ±0.1w, temperature ±0.5℃, and response speed <50ms; it has a local power control mode and a temperature closed-loop control mode, and has a remote power control mode and a temperature closed-loop control mode; it can be selected for online use and stand-alone use according to the actual needs of the test, the system equipment has a moderate size and is convenient for transportation, and can be selected for use in a wind tunnel and an outdoor test environment. The present invention utilizes a combination of electrical modules with different functions, transmits signals through electrical modules, and controls, records and displays control software, provides equipment integration and functional diversification, improves measurement efficiency, and uses a system to meet multiple test requirements, improve test efficiency, and meet system versatility. At the same time, the system is easy to assemble and carry, and meets the convenience of test preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural block diagram of a multifunctional heating and temperature measuring system for icing test according to the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the acquisition control unit of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the power control unit of the present invention;

[0035] Figure 4 This is a curve diagram of the test experimental data of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the specific embodiments described are only part of the embodiments of the present invention, rather than all of the specific embodiments. The components of the specific embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations, and the present invention can also have other embodiments.

[0037] Therefore, the following detailed description of the specific embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected specific embodiments of the present invention. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0038] In order to further understand the content, features and effects of the present invention, the following specific implementation methods are given as examples, and the attached Figure 1 -Attached Figure 4 The detailed instructions are as follows:

[0039] Embodiment 1:

[0040] A multifunctional heating and temperature measurement system for an icing test, comprising a remote control panel 1-1, a collection control unit 1-2, a power control unit 1-3 and a model thermocouple 2, wherein the remote control panel 1-1 is connected to the collection control unit 1-2 via a network cable, the collection control unit 1-2 is connected to the power control unit 1-3 via a cable III, the power control unit 1-3 is connected to the model thermocouple 2 via a cable I, and the model thermocouple 2 is connected to the collection control unit 1-2 via a cable II;

[0041] The power control unit 1-3 comprises an input channel 3, an output channel 4, a housing 6, a network interface 7, a programmable power module 8, a power input channel 9 and a power output channel 10, and the power control unit 1-3 is connected to the power supply 1;

[0042] The housing 6 of the power control unit 1-3 is provided with an input channel 3 and an output channel 4, the housing 6 is provided with a programmable power module 8, the programmable power module 8 is provided with a network interface 7, a power input channel 9 and a power output channel 10, the power supply 1 is connected to the power input channel 9 via the input channel 3, and the model thermocouple 2 is connected to the power output channel 10 via the output channel 4;

[0043] An HDMI interface 21, a USB interface 24, a second network interface 25, a second power output channel 26, a temperature input channel 27, and a power interface 28 are arranged on the rear side of the shell 31 of the acquisition control unit 1-2; a main power switch 13, a start / stop knob 14, a local / remote knob 15, a power / temperature knob 16, a temperature adjustment knob 18, a power adjustment knob 19, and a display screen 20 are arranged on the front side of the shell 31 of the acquisition control unit 1-2; a network switch 22, a microcontroller 23, a temperature acquisition module 30, an analog input and output module 11, a digital input and output module 12, and a digital-to-analog conversion card 17 are arranged in the shell 31 of the acquisition control unit 1-2; the power interface 28 of the acquisition control unit 1-2 is connected to the power supply 1, the temperature input channel 27 is connected to the model thermocouple 2, and the second power output channel 26 is connected to the power control unit 1-3;

[0044] The main power switch 13, start / stop knob 14, local / remote knob 15, power / temperature knob 16 in the acquisition control unit 1-2 are connected to the digital input and output module 12, the power adjustment knob 19 is connected to the digital-to-analog conversion card 17, the digital-to-analog conversion card 17 is connected to the analog input and output module 11, the digital input and output module 12 and the analog input and output module 11 are connected to the network switch 22, the network switch 22 is respectively connected to the second network interface 25, the temperature acquisition module 30, and the microcontroller 23, and the microcontroller 23 is connected to the HDMI interface 21, the USB interface 24, and the display screen 20.

[0045] Furthermore, a cooling fan 5 is also provided on the housing 6 of the power control unit 1 - 3 .

[0046] Furthermore, a second cooling fan 29 is provided on the rear side of the housing 31 of the acquisition control unit 1 - 2 .

[0047] Furthermore, the internal integration of the power control unit mainly includes a programmable power module, an input and output aviation socket design, and a fan. The input of the programmable power module is a 380V power supply, and the output is 0~40V voltage, 0~20A current, and 0~600w power. The input and output aviation socket design integrates the electrical signal and the communication signal into one channel, and the fan dissipates heat for the object;

[0048] Furthermore, the internal integration of the acquisition control unit includes a core controller, a network switch, a temperature acquisition module, an analog acquisition module, a DI / DO control module, a digital-to-analog conversion board, a power module, a small display, a USB interface, an HDMI interface, a network interface, an adjustment knob, a knob switch, and an aviation socket design. The core controller is a built-in controller of the acquisition control unit, including CPU, etc., which can directly control the system on the housing panel of the acquisition control unit; the network switch is a Gigabit 16-port switch; the temperature acquisition module adopts Advantech Adam6018, each module has 8 channels, a total of 5 modules; the analog acquisition module adopts Advantech Adam6017, using 8 channels, a total of 1 module; the DI / DO control module adopts Advantech Adam6060, using 3 channels, a total of 1 module; the digital-to-analog conversion board is a knob type, a total of 8, which converts the digital quantity into a 4~20mA analog current signal; the power module is a 24V DC power supply, which provides DC power for the temperature acquisition module, analog acquisition module, DI / DO control module, digital-to-analog conversion board, etc.; the adjustment knob is connected to the analog acquisition module to convert the digital quantity into a 4~20mA analog current signal; the knob switch is connected to the DI / DO control module to select local / remote control, power / temperature control, start / stop control, etc.; the network interface can be connected to the host computer to form a host computer control panel;

[0049] Further, the control panel includes three parts, the first part is a hardware panel for local operation on the acquisition control unit, the second part is a small screen software operation panel on the acquisition control unit, and the third part is a remote control panel for remote operation;

[0050] Furthermore, the model thermocouple is a T-type thermocouple, model TT-T-30, which can collect temperature in the range of -200°C to 260°C with an accuracy of ±0.5°C;

[0051] Furthermore, the related cables include a power supply cable between the model thermocouple and the power control unit, a temperature signal cable between the model thermocouple and the acquisition control unit, a power supply cable and a communication cable between the power control unit and the acquisition control unit, etc.

[0052] Embodiment 2:

[0053] A working method of a multifunctional heating and temperature measuring system for an icing test is implemented based on the multifunctional heating and temperature measuring system for an icing test described in Example 1. The power supply is AC input, and a DC output is processed by a microcontroller. The heating element is heated by adjusting the voltage, adjusting the current, and adjusting the power. The temperature open-loop control is realized by using the voltage control method and the power control method. The temperature closed-loop control is realized by combining the temperature setting value and the temperature feedback value measured by the temperature sensor, and the following steps are included:

[0054] S1. Use a model thermocouple to collect temperature. The hot end of the model thermocouple is in contact with the temperature measuring point of the model, and a micro voltage signal is generated at both ends of the model thermocouple.

[0055] Furthermore, the calculation formula for generating a micro-voltage signal at both ends of the model thermocouple in step S1 is:

[0056] ;

[0057] in, Indicates the temperature T and T Thermoelectric potential at time 0, Indicates temperature T Thermoelectric potential at Indicates temperature T Thermoelectric potential at time 0, and Respectively represent conductors A and conductor B The Seebeck coefficient;

[0058] S2. The cold end of the model thermocouple is connected to the temperature acquisition module, and the micro voltage signal of the model thermocouple is received by the temperature acquisition module. The temperature acquisition module processes the signal through the cold end compensator method and obtains the actual temperature value through analog conversion;

[0059] Furthermore, in step S2, the temperature acquisition module obtains the actual temperature value through analog conversion after processing by the cold end compensator method as follows:

[0060] ;

[0061] Formula (2) indicates that after the cold end compensation method, the cold end temperature is determined. At this time, the thermoelectric potential is a single-valued function of the measuring end temperature. It means that after the thermoelectric potential is obtained, the actual temperature of the measuring end is obtained through analog conversion;

[0062] S3. The actual temperature value measured by the model thermocouple is fed back to the microcontroller of the acquisition control unit as a feedback value. The microcontroller compares the temperature value fed back by the thermocouple with the temperature setting value, calculates the output control signal through the PID algorithm, and the programmable power module adjusts the actual power output according to the control signal to adjust the temperature, forming a closed-loop control system to achieve temperature convergence to the set value and achieve temperature closed-loop control;

[0063] ;

[0064] in, is the sampling sequence number, It is k The temperature setting value is It is k The actual temperature output value of the It is k The output control variable of the It is k The temperature deviation of It is k -1 temperature deviation, is the proportional coefficient of the PID control algorithm, is the integration time constant, is the differential time constant, T is the sampling period.

[0065] Furthermore, in step S3, the data actually collected at a certain frequency is first filtered to prevent interference from variables. The filtering adopts the Kalman filter algorithm, and then the mean value is processed. The formula is as follows:

[0066] ;

[0067] Where t is the temperature value after data processing, t i It is i The temperature value under sampling, n is the total number of data samples.

[0068] Furthermore, the use of the multifunctional heating and temperature measurement system for icing test includes online use or stand-alone use - temperature collection or stand-alone use - power control;

[0069] When you choose to use it online, the usage process includes the following steps:

[0070] Step 11. In the initial state, the model thermocouple, power control unit, acquisition control unit, temperature sensor, host computer, etc. are in an independent and unconnected state;

[0071] Step 12. System construction:

[0072] Select the online use mode, and connect the related cables to form a combined heating and temperature measurement system for online use. The temperature sensor is pasted and fixed to the temperature measurement point of the model thermocouple, and the other end of the temperature sensor is connected to cable Ⅱ; the power supply cable between the model thermocouple and the power control unit is set as cable Ⅰ, and cable Ⅰ is respectively connected to the output channels of the model thermocouple and the power control unit; the temperature acquisition special cable between the model thermocouple and the acquisition control unit is set as cable Ⅱ, and the model thermocouple temperature measurement point and the temperature 1 channel of the acquisition control unit are respectively connected; the communication cable between the power control unit and the acquisition control unit is set as cable Ⅲ, and the power 1 channel of the acquisition control unit and the input channel of the power control unit are respectively connected; the network is connected to the host computer to form the host computer control panel; the power line of the acquisition control unit is respectively connected to the input channel and the main power supply. In the initial state, the power on the acquisition control unit is not turned on, it is in the local control state, power control state, stop state, and the local control knob is at the lowest value state;

[0073] Step 13. System Operation:

[0074] (1) Local control, power control:

[0075] After the power is turned on, the acquisition control unit is in the local control state and the power control state, and the "power output adjustment knob" is at the lowest value. Rotate the "Start / Stop knob" clockwise to start the system, and rotate the "power output adjustment knob 1" clockwise to change the power output value. You can observe the numerical display and curve image display of the power output value and power feedback value on the small display screen on the acquisition control unit, as well as the numerical display and curve image display of the actual temperature of the temperature measuring point on the model thermocouple. The system output power is adjusted to the power setting value, and the temperature converges to the temperature equilibrium value. Rotate the "power output adjustment knob 1" counterclockwise to the minimum value, rotate the "Start / Stop knob" counterclockwise, the system stops working, and turns off the power;

[0076] (2) Local control, temperature closed-loop control:

[0077] After the power is turned on, the acquisition control unit is in the local control state and the power control state, and the "power output adjustment knob" is at the lowest value. Rotate the "power / temperature control" adjustment knob clockwise to adjust the system control mode to the temperature control model, rotate the "start / stop knob" clockwise to start the system, rotate the "temperature setting knob 1" clockwise to change the temperature setting value, and you can observe the numerical display and curve image display of the power output value on the small display screen on the acquisition control unit, as well as the temperature setting value of the temperature measuring point on the model thermocouple, the actual temperature feedback numerical display and the curve image display. The temperature will be adjusted to the temperature setting value, and the power will be automatically adjusted to maintain the temperature closed loop. Rotate the "temperature setting knob 1" counterclockwise to the minimum value, rotate the "start / stop knob" counterclockwise to stop the system, rotate the "power / temperature control" adjustment knob counterclockwise to adjust the system control mode to the power control mode, and turn off the power;

[0078] (3) Remote control, power control:

[0079] After the power is turned on, the acquisition control unit is in the local control state and the power control state, and the "power output adjustment knob" is at the lowest value. Rotate the "local / remote control" adjustment knob clockwise to adjust the system control mode to the remote control model, rotate the "start / stop knob" clockwise to start the system, and enter the power set value on the remote control panel. You can observe the numerical display and curve image display of the power output value and power feedback value on the remote control panel, as well as the numerical display and curve image display of the actual temperature of the temperature measuring point on the model thermocouple. The system output power is adjusted to the power setting value, and the temperature converges to the temperature equilibrium value. The remote control software saves the power and temperature test data. Click the stop button on the remote control panel to stop the system, and rotate the "start / stop knob" counterclockwise to turn off the power;

[0080] (4) Remote control, temperature closed-loop control:

[0081] After the power is turned on, the acquisition control unit is in the local control state and the power control state, and the "power output adjustment knob" is in the lowest value state. Turn the "local / remote control" adjustment knob clockwise to adjust the system control mode to the remote control model, turn the "power / temperature control" adjustment knob clockwise to adjust the system control mode to the temperature control model, turn the "start / stop knob" clockwise to start the system, enter the temperature set value on the remote control panel, and observe the numerical display and curve image display of the power output value on the remote control panel, as well as the numerical display and curve image display of the actual temperature of the temperature measuring point on the model thermocouple. The temperature will be adjusted to the temperature setting value, and the power will be automatically adjusted to maintain the temperature closed loop. The remote control software saves the power and temperature test data. Click the stop button on the remote control panel, the system stops working, and turn the "start / stop knob" counterclockwise to turn off the power.

[0082] When selecting the stand-alone mode - temperature collection, the usage process includes the following steps:

[0083] Step 21. In the initial state, the model thermocouple, power control unit, acquisition control unit, temperature sensor, host computer, etc. are in an independent and unconnected state;

[0084] Step 22. System construction:

[0085] Select the stand-alone temperature acquisition mode, and connect the relevant cables to form a stand-alone temperature measurement system. The temperature sensor is pasted and fixed to the model thermocouple temperature measurement point, and the other end of the temperature sensor is connected to cable Ⅱ; set the temperature acquisition dedicated cable between the model thermocouple and the acquisition control unit to cable Ⅱ, and connect the model temperature measurement point and the temperature 1 channel of the acquisition control unit respectively; connect the network to the host computer to form a host computer control panel; the power cord of the acquisition control unit is connected to the input channel and the main power supply respectively. In the initial state, the power on the acquisition control unit is not turned on, it is in local control state, stopped state, and the local control knob is at the lowest value state;

[0086] Step 23. System Operation:

[0087] After the power is turned on, the acquisition control unit is in the local control state, and the "power output adjustment knob" is at the lowest value. Turn the "local / remote control" adjustment knob clockwise to adjust the system control mode to the remote control model. Turn the "start / stop knob" clockwise to start the system. The temperature setting value, actual temperature numerical display and curve image display of the temperature measurement point on the model thermocouple can be observed on the remote control panel. The remote control software saves the power and temperature test data. Click the stop button on the remote control panel to stop the system. Turn the "start / stop knob" counterclockwise to turn off the power.

[0088] When selecting the single-machine mode - power control, the usage process includes the following steps:

[0089] Step 31. In the initial state, the model thermocouple, power control unit, acquisition control unit, temperature sensor, host computer, etc. are in an independent and unconnected state;

[0090] Step 32. System construction:

[0091] Select the single-machine power control mode, and connect the related cables to form a single-machine power control system; set the power supply cable between the model thermocouple and the power control unit as cable I, and cable I connects the output channels of the model and the power control unit respectively; connect the network to the host computer to form a host computer control panel; the power control unit power line is connected to the input channel and the main power supply respectively;

[0092] Step 32. System Operation:

[0093] Turn on the power, adjust the system control mode to the remote control model on the remote control software, enter the power set value on the remote control panel, and observe the numerical display and curve image display of the power output value and power feedback value on the remote control panel. The system output power is adjusted to the power setting value, and the remote control software saves the power test data. Click the stop button on the remote control panel to stop the system; the figure below is the image display of the voltage setting value and the actual voltage feedback value when the system is working alone.

[0094] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0095] Although the present application has been described above with reference to specific embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various features in the specific embodiments disclosed in the present application may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multifunctional heating and temperature measuring system for icing test, characterized in that: It comprises a remote control panel (1-1), a collection control unit (1-2), a power control unit (1-3) and a model thermocouple (2), wherein the remote control panel (1-1) is connected to the collection control unit (1-2) via a network cable, the collection control unit (1-2) is connected to the power control unit (1-3) via a cable III, the power control unit (1-3) is connected to the model thermocouple (2) via a cable I, and the model thermocouple (2) is connected to the collection control unit (1-2) via a cable II; The power control unit (1-3) comprises an input channel (3), an output channel (4), a housing (6), a network interface (7), a programmable power module (8), a power input channel (9) and a power output channel (10); the power control unit (1-3) is connected to a power source (1); An input channel (3) and an output channel (4) are arranged on the housing (6) of the power control unit (1-3); a programmable power module (8) is arranged in the housing (6); a network interface (7), a power input channel (9) and a power output channel (10) are arranged on the programmable power module (8); the power supply (1) is connected to the power input channel (9) via the input channel (3); and the model thermocouple (2) is connected to the power output channel (10) via the output channel (4); The rear side of the housing (31) of the acquisition control unit (1-2) is provided with an HDMI interface (21), a USB interface (24), a second network interface (25), a second power output channel (26), a temperature input channel (27), and a power interface (28); the front side of the housing (31) of the acquisition control unit (1-2) is provided with a main power switch (13), a start / stop knob (14), a local / remote knob (15), a power / temperature knob (16), a temperature adjustment knob (18), and a power adjustment knob (19). and a display screen (20); a network switch (22), a microcontroller (23), a temperature acquisition module (30), an analog input and output module (11), a digital input and output module (12), and a digital-to-analog conversion card (17) are arranged in a housing (31) of the acquisition control unit (1-2); a power interface (28) of the acquisition control unit (1-2) is connected to a power supply (1), the temperature input channel (27) is connected to a model thermocouple (2), and the second power output channel (26) is connected to a power control unit (1-3); The main power switch (13), the start / stop knob (14), the local / remote knob (15), and the power / temperature knob (16) in the acquisition control unit (1-2) are respectively connected to the digital input / output module (12); the power adjustment knob (19) is connected to the digital-to-analog conversion card (17); the digital-to-analog conversion card (17) is connected to the analog input / output module (11); the digital input / output module (12) and the analog input / output module (11) are connected to the network switch (22); the network switch (22) is respectively connected to the second network interface (25), the temperature acquisition module (30), and the microcontroller (23); and the microcontroller (23) is connected to the HDMI interface (21), the USB interface (24), and the display screen (20).

2. A multifunctional heating and temperature measuring system for icing test according to claim 1, characterized in that: A cooling fan (5) is also provided on the housing (6) of the power control unit (1-3).

3. The multifunctional heating and temperature measuring system for icing test according to claim 2 is characterized in that: A second cooling fan (29) is also provided on the rear side of the housing (31) of the acquisition control unit (1-2).

4. A working method of a multifunctional heating and temperature measuring system for an icing test, implemented by a multifunctional heating and temperature measuring system for an icing test according to any one of claims 1 to 3, characterized in that: The power supply is AC input, and the DC output is processed by the microcontroller. The heating element is heated by adjusting the voltage, current and power. The temperature open-loop control is realized by using the voltage control method and the power control method. The temperature closed-loop control is realized by combining the temperature set value and the temperature feedback value measured by the temperature sensor, including the following steps: S1. Use a model thermocouple to collect temperature. The hot end of the model thermocouple is in contact with the temperature measuring point of the model, and a micro voltage signal is generated at both ends of the model thermocouple. S2. The cold end of the model thermocouple is connected to the temperature acquisition module, and the micro voltage signal of the model thermocouple is received by the temperature acquisition module. The temperature acquisition module processes the signal through the cold end compensator method and obtains the actual temperature value through analog conversion; S3. The actual temperature value measured by the model thermocouple is fed back to the microcontroller of the acquisition control unit as a feedback value. The microcontroller compares the temperature value fed back by the thermocouple with the temperature setting value, calculates the output control signal through the PID algorithm, and the programmable power module adjusts the actual power output according to the control signal to adjust the temperature, forming a closed-loop control system to achieve temperature convergence to the set value and achieve temperature closed-loop control; ； in, is the sampling number, It is k The temperature setting value is It is k The actual temperature output value of the It is k The output control variable of the It is k The temperature deviation of It is k -1 temperature deviation, is the proportional coefficient of the PID control algorithm, is the integration time constant, is the differential time constant, T is the sampling period.

5. The working method of the multifunctional heating and temperature measuring system for icing test according to claim 4 is characterized in that: The calculation formula for generating a micro-voltage signal at both ends of the model thermocouple in step S1 is: ； in, Indicates the temperature T and T Thermoelectric potential at time 0, Indicates temperature T Thermoelectric potential at Indicates temperature T Thermoelectric potential at time 0, and Respectively represent conductors A and conductor B The Seebeck coefficient.

6. The working method of the multifunctional heating and temperature measuring system for icing test according to claim 5 is characterized in that: In step S2, the temperature acquisition module uses the cold end compensator method to convert the temperature into an analog value and obtains the actual temperature value: ； It means that after the cold end compensation method, the cold end temperature is determined. At this time, the thermoelectric potential is a single-valued function of the measuring end temperature. It means that after obtaining the thermoelectric potential, the actual temperature of the measuring end is obtained through analog conversion.

7. The working method of the multifunctional heating and temperature measuring system for icing test according to claim 6 is characterized in that: In step S3, the data actually collected at a certain frequency is first filtered to prevent interference from variables. The filtering adopts the Kalman filter algorithm, and then the mean value is processed. The formula is as follows: ； Where t is the temperature value after data processing, t i It is i The temperature value under sampling, n is the total number of data samples.

8. The working method of the multifunctional heating and temperature measuring system for icing test according to claim 7 is characterized in that: The use modes of the multifunctional heating and temperature measuring system for icing test include online use mode, stand-alone use mode - temperature collection, and stand-alone use mode - power control.

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