Static-thermal combined closed-loop control test system

Abstract

The invention discloses a static-thermal combined closed-loop control test system. The static-thermal combined closed-loop control test system comprises a heating subsystem, a liquid cooling subsystem, a sealing subsystem, a static force loading subsystem and a temperature measuring system. The heating subsystem can meet all-directional coverage heating of the antenna housing structure; the liquid cooling subsystem can perform liquid circulation cooling on an annular upper copper plate, a cold plate and an annular lower copper plate of the heater; the sealed subsystem can create an oxygen-free environment to avoid generation of open fire, and is provided with an efficient internal circulation gas filtering system to effectively absorb smoke generated in the test so as to ensure the safety and reliability of the test process; the static force loading subsystem can load aerodynamic force loads on the antenna housing structure, lateral mechanical load application at the stationary point of the antenna housing structure is achieved through a static force loading closed-loop control function, and the working targets of stability, reliability, high efficiency, monitoring performance and economical efficiency are further achieved. Therefore, the static-thermal joint test examination of the antenna housing structure with the ablation layer in an oxygen-free environment is realized.

Description

Technical Field

[0001] The invention relates to the technical field of environmental testing, and in particular to a static-thermal combined closed-loop control testing system. Background Art

[0002] The static-thermal joint test is one of the main test methods for evaluating the reliability of the radome structure. It is often used to verify whether the static-thermal strength and stiffness of the radome structure meet the design requirements. It is an important ground simulation verification test for military equipment. The aerodynamic heating of the missile at hypersonic speed is caused by the airflow flowing around the missile's exterior, that is, the friction between the air and the missile surface and the compression of the air in the missile's external boundary layer area, which causes the heat flow to enter the structure through convection, resulting in structural heating. The radome located at the front end of the missile, as a structural component of the missile and a key component of the guidance system, must not only withstand the most severe aerodynamic loads and environmental thermal loads, but also serve as a channel for transmitting and receiving electromagnetic signals to ensure normal communication between the missile and the outside world. Large aerodynamic loads and thermal stress caused by instantaneous high temperatures may lead to the destruction of the radome cover structure, thereby affecting the normal operation and guidance accuracy of the missile seeker antenna. Therefore, during the development process, the static-thermal joint test of the radome must be carried out.

[0003] The structure of the hypersonic missile radome is a streamlined ceramic cover, the root of which is bonded by a glue layer and a metal connecting ring with a similar thermal expansion coefficient, and the outside is coated with an ablative layer. As a solid heat-resistant material, the ablative layer can produce chemical changes such as oxidation, decomposition, and carbonization under the action of aerodynamic heating, and remove a large amount of heat by mass migration on the surface of the material, preventing the heat flow from entering the missile radome during re-entry into the atmosphere. In some scenarios, the peak temperature of the temperature load spectrum is required to be 1200°C, and the ablative layer produces thick smoke and fire during the reaction, accompanied by a large amount of toxic gases, which poses a severe test to laboratory safety and the effective implementation of the test. Therefore, effective measures must be taken to solve the safety and reliability problems during the application of thermal loads.

[0004] In view of the above problems, it is necessary to design a static-thermal joint closed-loop control test system that can simulate aerodynamic thermal loads and mechanical loads on the ground. It can not only measure the structural characteristic parameters, but also has safety, stability and reliability, so as to realize the static-thermal joint test assessment of the radome structure with ablative layer. It provides a theoretical reference for the static-thermal strength, stiffness design and reliability of the radome structure, which is of great significance.

[0005] In the static-thermal joint test, the ground equivalent simulation of flight aerodynamic heating and aerodynamic static force should be carried out simultaneously to simulate the superposition effect of temperature stress and mechanical stress. Thermal loads are generally applied by radiation heating such as quartz lamps, electric heating tubes, and graphite, with the surface heat flux density or structural temperature of the structure as the equivalent parameter to simulate the flight aerodynamic heating effect; mechanical loads are applied by mechanisms such as actuators, with the centrifugal force, bending moment, etc. as the equivalent parameters to simulate the flight aerodynamic static force effect. However, there are several problems with the antenna cover structure with an ablative layer: (1) Since the ablative layer produces a large amount of toxic gas during the reaction, it poses a severe test to laboratory safety and the effective implementation of the test; (2) Since the ablative layer produces thick smoke and fire during the reaction, it will not only cause particulate matter to deposit on the surface of the quartz lamp, reducing the heat conduction efficiency, but also cause the quartz lamp tube of the heater to be subjected to excessive thermal stress and uneven heat distribution, which can easily cause the lamp tube to explode, resulting in the test being forced to suspend; (3) Since the ground simulation assessment requires a peak temperature of the temperature load spectrum of 1200°C, the reflector may be deformed and damaged due to excessive thermal stress, causing the heater to fail and the test to be forced to suspend; (4) For the static and thermal joint test of the antenna cover structure with an ablative layer, oxygen-free chamber equipment is often used for assessment, which makes the test cost too high and the test difficult to implement. Summary of the invention

[0006] The object of the present invention is to provide a static-thermal combined closed-loop control test system for static-thermal combined test assessment of a radome structure with an ablative layer in an oxygen-free environment.

[0007] When conducting a static-thermal combined test assessment on a radome structure with an ablative layer, the following requirements are imposed on the static-thermal combined closed-loop control test system: (1) The heating subsystem can meet the requirements of all-round coverage heating of the radome structure, and realize 1200°C temperature spectrum loading through the temperature closed-loop control function; (2) The liquid cooling subsystem can perform liquid circulation cooling on the upper copper plate, cold plate and lower copper plate of the heater to ensure the normal operation of the heating equipment; (3) The sealing subsystem can create an oxygen-free environment to avoid the generation of open flames, and is equipped with an efficient internal circulation gas filtration system to effectively absorb the smoke generated during the test to ensure the safety and reliability of the test process; (4) The static loading subsystem can load the radome structure, and realize the application of the lateral mechanical load spectrum at the stagnation point of the radome structure through the static loading closed-loop control function; (5) The sensor feedback signal is processed by the data acquisition instrument and output to the upper computer of the temperature measurement system for display and recording, so as to realize real-time acquisition and monitoring of temperature test data; (7) The test process is safe and reliable, and has a certain degree of economy.

[0008] To achieve the above purpose, the technical solution provided by the present invention is as follows: A static-thermal combined closed-loop control test system, comprising a heating subsystem, a liquid cooling subsystem, a sealing subsystem, a static loading subsystem, and a temperature measurement system; The heating subsystem uses a circular array quartz lamp group for the heater to perform radiation heating on the test piece; the real-time temperature value of the temperature control point sensor is fed back to the heating controller through the signal conditioning module, and the control signal is output to the thyristor through the PID closed-loop control algorithm to control the thyristor trigger angle to adjust the voltage waveform; The liquid cooling subsystem cools the reflector plate and the quartz lamp by using a series structure flow channel for the heater reflector plate and the upper and lower copper plates; the water in the water tank is driven by a water pump to flow through the refrigeration device along the circulation pipeline to take away the heat on the heater cold plate, thereby achieving liquid cooling circulation control; The sealing subsystem realizes an oxygen-free test environment and filters the gas in the cabin by assembling the loading frame into a transparent nitrogen-filled sealed cabin and installing a gas internal circulation filter device; The static loading subsystem installs the actuator to the specimen loading position, and after the displacement sensor feeds back the displacement value to the servo valve to complete the connection between the loading fixture and the actuator, the force load control is switched and the oil source oil pressure is adjusted to achieve static closed-loop control; The temperature measurement system collects temperature signals for real-time display, storage, analysis and processing.

[0009] The heating subsystem includes a thyristor, a signal conditioning module, a heater, a heating controller, and a temperature sensor. The heater includes an annular upper copper plate, an upper copper plate water-cooling flow channel, a copper column mounting hole, a reflector plate water-cooling flow channel, a mounting clamp, a reflector, an annular lower copper plate, a lower copper plate water-cooling flow channel, a specimen fixing fixture, a heater support seat, an outer wall plate, a rib plate, and a ceramic column. The reflector, the outer wall plate, and the rib plate are designed with double ear clamps to form a liquid-cooled cold plate, which is fixed together with the mounting clamp to form an annular heating The heater has an inner cavity which is a water-cooling channel for the reflector, and the grooves on the annular upper copper plate and the annular lower copper plate are the water-cooling channel for the upper copper plate and the lower copper plate; the copper columns are screwed into the copper column mounting holes at both ends to fix the quartz lamp array, and the ceramic column is used as an electrical connector for the heater; the temperature control point sensor is connected to the signal conditioning module and the heating controller in turn, and the heater and the thyristor are connected, and then the heating controller and the thyristor and the host computer of the heating loading system are connected in turn to realize the temperature closed-loop control function of the heater and the application of aerodynamic thermal load.

[0010] The temperature measurement system includes a sensor, a temperature measuring instrument and a temperature detection host computer; the temperature measuring instrument is connected to the temperature monitoring point sensor and the temperature detection host computer in sequence to realize real-time collection and monitoring of temperature test data.

[0011] Among them, the liquid cooling subsystem includes a water pump, pipelines, a liquid cooling cold plate, a refrigeration device, and a water tank; the refrigeration device includes an evaporator, a compressor, a condenser, and a throttle valve; the water in the water tank is driven by the water pump to flow along the circulation pipeline through the water divider to the annular upper copper plate, the liquid cooling cold plate, and the annular lower copper plate, and then converge into the evaporator in the refrigeration device through the water divider. The refrigerant absorbs the heat of the water and vaporizes in the evaporator, and is adiabatically compressed into a high-temperature and high-pressure gas by the compressor. In the condenser, it cooperates with the cooling fan to exchange heat with the air. After releasing heat, it condenses into liquid, expands and reduces the pressure through the throttle valve, enters the evaporator, and vaporizes again to absorb the heat of the water. This cycle achieves the purpose of circulating water cooling.

[0012] The sealing subsystem includes a sealed cabin, an internal circulation fan, an internal circulation air duct, a flow valve, a filter device, and an oxygen detector, wherein the sealed cabin includes a mounting base, a base, a column, an air duct support plate, an air duct fixing plate, a top cover, and a film; the mounting base is hoisted onto the test bearing foundation, and then the base is hoisted to the center of the mounting base to form a stable and reliable connection with the test foundation; the columns are hoisted to the base in turn, and the top cover is aligned with the holes of the columns to complete the assembly of the sealed cabin; the servo cylinder is lifted to the specified installation height by a forklift and connected to the column; the bottom connecting ring of the antenna cover structure is connected to the test fixing tooling Connect them in sequence, install the loading fixture of the sleeve type design from the top of the antenna cover structure, connect the heater support seat, the test fixture and the base in turn, and then connect them to the heater through the waist hole on the installation splint to complete the overall assembly of the heater; connect the air duct support plate to the base, the air duct fixing plate and the air duct support plate in turn, connect the internal circulation air duct to the air duct fixing plate and the internal circulation fan respectively, and connect the square flange adapter to the internal circulation fan and the box filter respectively to complete the installation of the internal circulation gas filtration system; place the external sampling extension pipe of the pump-suction oxygen detector at the bottom of the sealed cabin to realize the long-distance suction sampling of the gas in the sealed cabin.

[0013] Among them, the static loading subsystem includes a static loading host computer, an oil source control host computer, an oil source power system and an oil source cooling system, a servo cylinder, a hydraulic substation, an oil distributor, a servo control system, and a protection and transfer cabinet: the oil source control host computer sends a control signal to the oil source power system, and then divides the high-pressure hydraulic oil output by the oil source power system into multiple outputs to the hydraulic substation through the oil distributor, and then outputs it to the servo cylinder. The oil source cooling system cools the oil source equipment and oil; the static loading host computer sends a control signal, which is processed by the servo control system and the protection and transfer cabinet before reaching the servo cylinder. The servo oil The cylinder performs loading actions according to the test instructions. The servo control system accurately controls the output displacement or output force of the servo cylinder through real-time feedback from the displacement and load sensor of the servo cylinder. The servo cylinder is connected to the loading fixture. The film is installed along the wall panels on the bottom plate and the top cover. The sealed cabin is sealed for the final sealing procedure. The ventilation fan is fixed at the air outlet above the film. The AC power is turned on. The ventilation fan and the internal circulation fan are started. The oxygen detector is turned on. The gate valve of liquid nitrogen is opened. The booster valve of liquid nitrogen is screwed. The flow valve is screwed. Nitrogen is injected into the sealed cabin until the oxygen concentration reaches the target value. The formal test begins. This ensures the accuracy of the static and thermal joint test loading of the antenna cover structure with ablative layer and truly simulates the aerodynamic environment of the antenna cover structure with ablative layer. The static and thermal joint closed-loop control test system is used to complete the static and thermal test conditions. The temperature measurement system is used to realize the real-time acquisition and monitoring of temperature test data, and the static and thermal joint test assessment of the antenna cover structure with ablative layer in an oxygen-free environment is completed.

[0014] It should be noted that the heater uses a circular array quartz lamp group, which not only fits the shape and structure of the antenna cover, but also covers the heating area in all directions, thereby fully improving the heating efficiency and uniformity. The heater and the thyristor are connected by cables, and the temperature control point sensor is connected to the heating controller through the signal conditioning module. The heating controller is then connected to the thyristor and the heating loading system host computer in turn, which can realize the temperature closed-loop control function of the heater to apply a 1200°C temperature load to the antenna cover structure.

[0015] It should be noted that the liquid cooling subsystem can be used to liquid cool the water cooling channel of the reflector, the upper copper plate water cooling channel and the lower copper plate water cooling channel respectively to ensure the normal operation of the heating equipment. The sealed cabin can be designed according to the base size and operating space, and the gas channel is designed in the bottom plate frame. The gate valve of liquid nitrogen is opened, and after the booster valve is pressurized and gasified, the flow valve is opened to inject nitrogen into the sealed cabin. The base and columns can be installed and arranged in a modular manner to improve the flexibility of the structure and the test efficiency to meet the load and size requirements of various antenna cover structures. By injecting nitrogen into the sealed cabin to create an oxygen-free environment to avoid the generation of open flames, and connecting to a pump-suction oxygen detector, the gas in the sealed cabin can be sucked and sampled from a distance. In addition, the internal circulation gas filtration system in the sealing subsystem adopts a box filter, which contains three layers of primary, medium and high efficiency filters, which can effectively intercept smoke particles during the test and adsorb harmful substances generated during the test to meet the requirements of safety, stability and reliability during the static and thermal joint test.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present application designs a static-thermal combined closed-loop control test system. The heating subsystem can meet the requirements of all-round heating of the antenna cover structure, and realize 1200°C aerodynamic thermal load loading through the temperature closed-loop control function; the liquid cooling subsystem can perform liquid circulation cooling on the annular upper copper plate, cold plate and annular lower copper plate of the heater to ensure the normal operation of the heating equipment; the sealing subsystem can create an oxygen-free environment to avoid the generation of open flames, and is equipped with an efficient internal circulation gas filtration system to effectively absorb the smoke generated in the test to ensure the safety and reliability of the test process; the static loading subsystem can load the antenna cover structure with aerodynamic loads, and realize the application of lateral mechanical loads at the stationary point of the antenna cover structure through the static loading closed-loop control function, and also has the working goals of stability, reliability, high efficiency, monitorability and economy, so as to realize the static-thermal combined test assessment of the antenna cover structure with an ablative layer in an oxygen-free environment.

[0017] The static-thermal combined closed-loop control test system can simulate the ground equivalent aerodynamic thermal load and mechanical load on the radome structure with an ablative layer in an oxygen-free environment. The heating subsystem applies a temperature load of 1200°C to the radome structure through the temperature closed-loop control function of the quartz lamp heater. The heater adopts a circular array quartz lamp group, which not only fits the shape structure of the radome, but also covers the heating area in all directions, thereby fully improving the heating efficiency and uniformity, and truly simulating the aerodynamic thermal environment of the radome structure with an ablative layer. The liquid cooling subsystem drives the water in the water tank through the circulation pipeline through the refrigeration device through the water pump to liquid cool the upper copper plate, cold plate and lower copper plate of the heater respectively, to ensure the normal operation requirements of the heating equipment. The sealed cabin in the sealing subsystem can be designed according to the base size and operating space. The base and columns can be installed in a modular manner to improve the flexibility of the structure and the test efficiency to meet the load-bearing and size requirements of various antenna cover structures. By injecting nitrogen into the sealed cabin to create an oxygen-free environment to avoid the generation of open flames, and connecting to a pump-suction oxygen detector, the gas in the sealed cabin can be sucked and sampled from a distance. In addition, the internal circulation gas filtration system in the sealing subsystem can effectively intercept smoke particles during the test and absorb harmful substances generated during the test to ensure the safety and reliability of the test. The static loading subsystem uses the static loading closed-loop control function to achieve the application of the lateral mechanical load spectrum at the stagnation point of the antenna cover structure to ensure the accuracy of the test and truly simulate the aerodynamic environment of the antenna cover structure with an ablative layer. The temperature measurement system samples the voltage signal through the data acquisition instrument and converts it into a temperature measurement value through the temperature-potential relationship. The collected signal is displayed, analyzed and processed in real time by the vibration measurement system host computer to realize real-time collection and monitoring of temperature test data, which plays a guiding role in the static-thermal combined test analysis, so as to achieve the accuracy assessment of the static-thermal combined test of the antenna cover structure with an ablative layer in an oxygen-free environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a static-thermal combined closed-loop control test system provided in an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the sealed cabin in the embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the heater in the embodiment of the present application; Figure 4 This is a schematic diagram of the structure of the liquid cooling subsystem in the embodiment of the present application; Figure 5 This is a schematic diagram of the sealing subsystem structure in the embodiment of the present application; Figure 6 This is a schematic diagram of the structure of the static loading subsystem in the embodiment of the present application; In the figure: 1-heating loading system host computer; 2-temperature detection host computer; 3-static loading host computer; 4-heating controller; 5-thyristor; 6-temperature measuring instrument; 7-static controller; 8-signal conditioning module; 9-ventilation fan; 10-internal circulation air duct; 11-flow valve; 12-internal circulation fan; 13-oxygen detector; 14-filter; 15-liquid nitrogen; 16-refrigeration device; 17-water tank; 18-water pump; 19-top cover; 20-air duct fixing plate; 21-loading tooling; 22-servo cylinder; 23-column; 24-film; 25-air duct support plate; 26-heater; 27-heater support seat; 28-test fixing tooling; 29-base; 30-installation base plate; 31-test bearing foundation; 32-annular upper copper plate; 33-upper copper plate water-cooling flow channel; 34-copper column mounting hole; 35-reflector plate water-cooling flow channel; 36-mounting splint; 37-reflector; 38-annular lower copper plate; 39-lower copper plate water-cooling flow channel; 40-outer wall plate; 41-ceramic column; 42-rib plate; 43-water distributor; 44-evaporator; 45-throttle valve; 46-compressor; 47-condenser; 48-boosting valve; 49-gate valve; 50-flow valve; 51-AC power supply; 52-oil source control host computer; 53-servo control system; 54-protection and transfer cabinet; 55-hydraulic substation; 56-oil distributor; 57-oil source power system; 58-oil source cooling system; 59-sealed cabin. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set, and can refer to direct connection or indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0022] In order to effectively solve the technical problems raised by this application, this application provides a static-thermal combined closed-loop control test system that can perform static-thermal combined test assessments on antenna cover structures with ablative layers in an oxygen-free environment. First, the heating subsystem applies a temperature load to the antenna cover structure through the temperature closed-loop control function of the quartz lamp heater. The heater uses a ring array quartz lamp group, which can not only match the external structure of the antenna cover, but also cover the heating area in all directions, thereby fully improving the heating efficiency and uniformity. Secondly, the liquid cooling subsystem uses a water pump to drive the water in the water tank to flow through the circulation pipeline through the refrigeration device to perform liquid cooling on the upper copper plate, cold plate and lower copper plate of the heater to ensure the normal operation of the heating equipment; thirdly, the sealing subsystem creates an oxygen-free environment to avoid open flames by designing a transparent nitrogen-filled sealed cabin, and is equipped with an efficient internal circulation gas filtration system to effectively absorb the smoke generated during the test to ensure the safety and reliability of the test; fourthly, the static loading subsystem applies a lateral mechanical load to the stagnation point of the antenna cover structure through the static loading closed-loop control system of the servo cylinder, and loads in the form of an axial collar, and fills the contact surface between the collar and the specimen with insulation material to avoid the influence of stress concentration. Fifthly, the static-thermal combined closed-loop control test system greatly reduces the equipment cost, has a certain economy, and the test process is safe and reliable, which can effectively realize the ground simulation of the thermal load and mechanical load environment of the antenna cover structure with an ablation layer during the test.

[0023] See also Figures 1 to 6 The present embodiment provides a static-thermal combined closed-loop control test system, which includes a heating subsystem, a liquid cooling subsystem, a sealing subsystem, a static loading subsystem, and a temperature measurement system.

[0024] 1. Hoist the installation base plate 30 onto the test bearing foundation 31, and then hoist the base 29 to the center of the installation base plate 30, and form a stable and reliable connection with the test foundation 31 through large-diameter screws, pads, and nuts. Hoist the columns 23 to the base 29 in sequence, align the installation holes of the top cover 19 to the columns 23, and connect and lock them with bolts and gaskets to complete the construction of the sealed cabin 59. Lift the servo cylinder 22 to the specified installation height by a forklift, and connect it with the column 23, and then hang the front and rear ends of the servo cylinder 22 by two hoists to facilitate the adjustment of the height of the servo cylinder 22 later.

[0025] 2. The reflector 37, the outer wall plate 40 and the rib plate 42 form a liquid-cooled cold plate with a double-ear clamp design, and are fixed together with the mounting clamp plate 36 to form a ring heater 26, the inner cavity of which is the reflector water-cooling channel 35, which is used for cooling the reflector. The quartz lamp array is fixed by screwing the copper columns into the copper column mounting holes 34 at both ends of the annular upper copper plate 32 and the annular lower copper plate 38, and the position of the quartz lamp tube can also be changed by adjusting the screwing depth. The grooves on the annular upper copper plate 32 and the annular lower copper plate 38 are the upper copper plate water-cooling channel 33 and the lower copper plate water-cooling channel 39, which are used for copper plate cooling. The ceramic column 41 is used as an electrical connector of the heater 26, which is used for shell insulation and electrical connection. The heater support seat 27, the test fixture 28 and the base 29 are connected in sequence. The temperature sensor is attached to the outer wall of the test piece by ceramic high-temperature glue. The temperature measurement points are divided into temperature control points and temperature monitoring points. The connection is completed with the heater 26 through the waist hole on the mounting clamp 36, and the waist hole design can realize the height adjustment of the heater 26. The heater 26 and the thyristor 5 are connected by cables. The temperature control point sensor is connected to the signal conditioning module 8 and the heating controller 4 in sequence, and then the heating controller 4 and the thyristor 5, the heating loading system host computer 1 and the heating controller 4 are connected in sequence by network cables, so as to realize the temperature closed-loop control function of the heater 26 and the application of aerodynamic thermal load. The temperature monitoring point sensor is connected to the temperature measuring instrument 6 by cables, and the temperature measuring instrument 6 is connected to the temperature detection host computer 2 by network cables to realize real-time collection and monitoring of temperature test data. The bottom connecting ring of the radome structure is connected to the test fixture 28 by bolts and gaskets. The loading fixture 21 adopts a sleeve ring design and is fixed from the outer periphery of the set structure above the radome structure to realize the application of lateral aerodynamic load.

[0026] 3. The water in the water tank 17 is driven by the water pump 18 to flow along the circulation pipeline through the water divider 43 to the upper annular copper plate 32 on the heater, the liquid cooling cold plate and the lower annular copper plate 38, and then converges into the evaporator 44 in the refrigeration device 16 through the water divider 43. The refrigerant absorbs the heat of the water and vaporizes in the evaporator 44, and is adiabatically compressed into a high-temperature and high-pressure gas by the compressor 46. In the condenser 47, the cooling fan cooperates with the air to exchange heat, and condenses into liquid after heat release. After expansion and pressure reduction by the throttle valve 45, it enters the evaporator 44, and vaporizes and absorbs the heat of the water again. The purpose of circulating water cooling is achieved through this cycle.

[0027] 4. Connect the duct support plate 25 to the base 29, the duct fixing plate 20 and the duct support plate 25 in sequence through bolts, washers and nuts. Connect one end of the internal circulation duct 10 to the interface on the duct fixing plate 20 through a throat clamp, and the other end to the internal circulation fan 12. Then, connect the square flange adapter to the other end of the internal circulation fan 12 through another section of the internal circulation duct 10 by means of a throat clamp. Finally, connect the square flange adapter to the box filter 14 through a fast thread to complete the installation of the internal circulation gas filtration system. Align the external sampling extension pipe mouth of the pump-suction oxygen detector 13 with the bottom of the sealed cabin 59, so as to realize the long-distance suction sampling of the gas in the sealed cabin 59 and ensure the safety of personnel during the test.

[0028] 5. The oil source control host computer 52 sends a control signal to the oil source power system 57, which serves as the power source of the entire servo loading system and provides the system with working high-pressure hydraulic oil. The high-pressure hydraulic oil output by the oil source power system 57 is then divided into multiple outputs to the hydraulic substation 55 through the oil distributor 56. The hydraulic substation 55 is the secondary pressure regulating unit of the servo loading system, which can perform secondary regulation and voltage stabilization on the high-pressure oil provided by the oil distributor 43. The oil enters the servo cylinder 22 after filtering. The oil source cooling system 58 cools the oil source equipment and oil. The static loading host computer 3 sends a control signal, which is processed by the servo control system 53 and the protection and transfer cabinet 54 in turn and reaches the servo cylinder 22. The servo cylinder 22 performs the loading action according to the test instruction. The servo cylinder 22 is equipped with a displacement sensor and a load sensor to measure the displacement and load output. The servo control system 53 accurately controls the output displacement or output force of the servo cylinder 22 through the real-time feedback of the displacement and load sensors of the servo cylinder 22.

[0029] 6. Before the formal test begins, pre-debug the heater 26 and the servo cylinder 22. After ensuring that they are correct, complete the hard connection of the servo cylinder 22. Use sealant to surround the film 24 along the wall panels on the installation base plate 30 and the top cover 19 to seal the sealed cabin 59. Fix the ventilation fan 9 at the air outlet above the film 24, turn on the AC power supply 51, start the ventilation fan 9 and the internal circulation fan 10, turn on the 1# and 2# oxygen detectors 14, open the gate valves 49 of the 1# and 2# liquid nitrogen 15, and observe whether the outlet is gaseous nitrogen by screwing the booster valves 48 of the 1# and 2# liquid nitrogen 15. If not, continue to increase the force of screwing the booster valves 48 of the 1# and 2# liquid nitrogen 15 until the outlet is gaseous nitrogen. Twist the 1# and 2# flow valves 50 to start injecting nitrogen into the sealed cabin 59, and observe the monitoring values ​​of the 1# and 2# oxygen detectors 14 to see if the target values ​​are reached. If not, continue to increase the force of twisting the 1# and 2# flow valves 50 until the oxygen concentration in the sealed cabin 59 reaches the target value and start the formal test.

[0030] 7. The static-thermal test conditions are realized through the static-thermal combined closed-loop control test system, the temperature test data is collected and monitored in real time through the temperature measurement system, and the static-thermal combined test assessment of the antenna cover structure with ablative layer in an oxygen-free environment is completed.

[0031] The present invention can be widely used in the static-thermal combined test assessment of various antenna cover structures with ablative layers, as well as the design and construction of static-thermal combined test systems.

[0032] It should be noted that the heating subsystem uses a circular array quartz lamp group for the heater to perform radiation heating on the specimen. The real-time temperature value of the temperature control point sensor is fed back to the heating controller through the signal conditioning module, and the control signal is output to the thyristor through the PID closed-loop control algorithm to control the thyristor trigger angle to adjust the voltage waveform, so as to adjust the voltage at both ends of the heater and achieve temperature closed-loop control to achieve the application of temperature stress at the peak temperature of the temperature load spectrum of 1200°C. The liquid cooling subsystem cools the reflector and quartz lamp by using a series structure flow channel for the heater reflector and the upper and lower copper plates. The water in the water tank is driven by a water pump to flow through the refrigeration device along the circulation pipeline to take away the heat on the cold plate of the heater, so as to achieve liquid cooling circulation control to ensure the stable and reliable operation of the heater. The sealing subsystem creates an oxygen-free test environment and filters the gas in the cabin by assembling the loading frame into a transparent nitrogen-filled sealed cabin and installing a gas internal circulation filter device to ensure safety and reliability during the implementation of the test. The static loading subsystem installs the actuator to the specimen loading position, and the displacement sensor feeds back the displacement value to the servo valve to complete the connection between the loading fixture and the actuator, then switches the load control and adjusts the oil source oil pressure to achieve static closed-loop control to achieve the mechanical stress application of the tensile and compressive mechanical load spectrum. The temperature measurement system consists of sensors, data acquisition instruments, and a temperature measurement system host computer. The collected temperature signal can be displayed, stored, analyzed, and processed in real time, and is mainly used to measure the temperature response of the specimen in a heated environment.

[0033] It should be noted that the heating subsystem is composed of a thyristor, a signal conditioning module, a heater, a heating controller, and a temperature sensor. The thyristor is also called a thyristor power controller, which is based on a thyristor and has an intelligent digital control circuit as the main control core power controller. The voltage waveform is adjusted by controlling the thyristor trigger angle to adjust the output voltage, thereby achieving closed-loop control of the heating power. This method can accurately control the heating power, improve the heating efficiency, and ensure the stability and reliability of the heating process. The temperature signal of the temperature control point sensor on the outer wall of the specimen is used as the feedback of the temperature closed-loop control. After being collected by the signal conditioning module, it is converted into a proportional 0-10V feedback signal to the heating controller. After the PID closed-loop control algorithm, the heating controller outputs a 0-20mA control signal to the signal isolator, and the 0-20mA control signal is converted and output to the PLC. The PLC processes it into a 0-10V control signal to the power regulator. The power regulator adjusts the voltage output on the heater to achieve heating power regulation and achieve the temperature closed-loop control function.

[0034] In view of the customization requirements for the heater structure and shape and the requirements for resistance to thermal shock, a quartz lamp heater is selected. By adopting a circular array quartz lamp group, it can not only match the shape and structure of the antenna cover, but also cover the heating area in all directions, thereby fully improving the heating efficiency and uniformity. The heater consists of a circular upper copper plate, an upper copper plate water-cooling flow channel, a copper column mounting hole, a reflector water-cooling flow channel, a mounting splint, a reflector, a circular lower copper plate, a lower copper plate water-cooling flow channel, a specimen fixing fixture, a heater support seat, an outer wall plate, a rib plate, and a ceramic column. The annular upper copper plate and the annular lower copper plate play the role of fixing the quartz lamp tube, transmitting current and connecting electrical equipment; the upper copper plate water-cooling flow channel and the lower copper plate water-cooling flow channel are grooves on the annular upper copper plate and the annular lower copper plate respectively. Water is injected through a quick-plug water joint and connected to the liquid cooling system through the water-cooling flow channel to form circulating water cooling; the copper column mounting holes on the annular upper copper plate and the annular lower copper plate are the installation positions of the end joints of the quartz lamp tube. The quartz lamp tube is installed and fixed by screwing the copper columns at both ends of the copper column mounting holes, and the position of the quartz lamp tube can also be changed by adjusting the screwing depth; the reflector plate water-cooling flow channel is composed of a reflector plate, a rib plate and an outer wall plate. The double-ear clamp design constitutes a liquid-cooled cold plate, which can efficiently absorb the heat generated by the heating equipment for effective cooling, thereby cooling down and maintaining the normal operation of the equipment. The function of the reflector is to reflect the heat to the antenna cover structure, reduce the space radiation loss of heat, and improve the efficiency of the heater; the rib plate can enhance the stability and effectiveness of water flow, ensure the smooth flow of water, and make the cooling effect of the reflector more efficient; in addition to forming a closed water-cooling channel with the reflector and rib plate, the outer wall plate also plays the role of supporting the rib plate and resisting the impact of water flow; the mounting splint is a connector enclosed by the liquid-cooled cold plate, and the connecting hole between the mounting splint and the heater support seat adopts a waist hole design, which can realize the height adjustment of the heater; the heater support seat is the overall load-bearing component of the heater, which mainly plays the role of support and fixation; the specimen fixing tool mainly provides stable support and rigidity for the antenna cover structure to ensure the stability and reliability of the loading process. The ceramic column is used as an insulating terminal for shell insulation and electrical connection to ensure the normal operation of the heater. The heating subsystem can achieve all-round coverage heating of the antenna cover structure, and the temperature closed-loop control function can achieve 1200℃ temperature loading.

[0035] It should be noted that the liquid cooling subsystem is composed of a water pump, a pipeline, a liquid cooling cold plate, a refrigeration device, a water tank, etc., wherein the refrigeration device is composed of an evaporator, a compressor, a condenser, a throttle valve, etc., and is used for cooling the heating system. The water pump drives the water in the water tank to flow along the circulation pipeline through the water divider to the annular upper copper plate, the liquid cooling cold plate and the annular lower copper plate of the heater, and then converges into the evaporator in the refrigeration device through the water divider. The refrigerant absorbs the heat of the water in the evaporator and vaporizes. It is adiabatically compressed into a high-temperature and high-pressure gas by the compressor. In the condenser, it cooperates with the cooling fan to exchange heat with the air. After releasing heat, it condenses into a liquid, and enters the evaporator after expansion and pressure reduction by the throttle valve. It is vaporized again and absorbs the heat of the water. The purpose of circulating water cooling is achieved by this cycle. The annular upper copper plate, the cold plate and the annular lower copper plate of the heater are liquid-cooled respectively through the liquid cooling system. The annular upper and lower copper plates and the cold plate all adopt a series structure flow channel. The flow path is single and easy to control, ensuring the normal operation of the heating equipment.

[0036] It should be noted that the sealing subsystem is composed of a sealed cabin, an internal circulation fan, an internal circulation air duct, a flow valve, a filter device, liquid nitrogen, an oxygen detector, etc., wherein the sealed cabin is composed of a mounting base, a base, a column, an air duct support plate, an air duct fixing plate, a top cover and a film. Considering the stability of loading and the convenience of operation, the size of the mounting base is determined according to the size of the base and the reserved operating space, and a gas channel is designed in the mounting base frame. Pneumatic quick plugs are installed at the four corners, the liquid nitrogen gate valve is opened, and after the pressure valve is pressurized and gasified, the flow valve is opened to inject nitrogen into the sealed cabin; the base and the column are standard model test pieces manufactured by mechanical processing, and have a universal standard interface. The base forms a stable and reliable connection with the test bearing foundation through large-diameter screws, pads, and nuts, and then the columns, base, and top cover are connected from bottom to top through bolts and gaskets to form a test frame. After completing the installation procedures of internal workpieces and equipment, the film is finally installed around the wall panels on the installation bottom plate and top cover, and the sealing procedure of the test frame is completed by sealant to ensure the stability, bearing capacity, and sealing of the entire test system. According to the size of the base and the operating space, the sealed cabin can be designed in a finalized manner. The modular installation arrangement of the base and columns greatly improves the flexibility of the structure. It has the characteristics of simple structure, efficient construction, reusability, and safety assurance, which effectively improves the test efficiency. The duct support plate and duct fixing plate mainly play the role of supporting, fixing and positioning. The duct support plate is fixed to the base by bolts, and then the duct fixing plate is installed on the duct support plate, which can accurately locate the exhaust port position directly above the test piece, and can effectively absorb the smoke generated during the test process; the internal circulation fan and the internal circulation duct are high-power high-temperature axial flow fan and high-temperature exhaust duct respectively, which have the advantages of good temperature resistance, convenient installation and small footprint. The internal circulation gas filtration system adopts a box filter, which contains three layers of primary, medium and high efficiency filters, which can effectively intercept smoke particles during the test and absorb harmful substances generated during the test. It has the advantages of high interception rate, large dust holding capacity, reusability and convenient installation. Connect one end of the internal circulation duct to the interface on the duct fixing plate through a throat clamp, and connect the other end to the internal circulation fan. Then, connect the square flange adapter to the other end of the internal circulation fan through another section of the internal circulation duct in the form of a throat clamp. Finally, connect the square flange adapter to the box filter through a fast wire to complete the installation of the internal circulation gas filtration system. The pump-suction oxygen detector is connected to an external sampling extension tube, which can remotely extract and sample the gas in the sealed cabin, ensuring the safety of personnel during the test. It also has the advantages of fast response, good stability, and high sensitivity, and reliable test data. The sealing system can not only create an oxygen-free environment to avoid open flames, but also effectively absorb the smoke generated during the test, ensuring the safety and reliability of the test.

[0037] It should be noted that the static loading subsystem is composed of a static loading host computer, an oil source control host computer, an oil source power system, an oil source cooling system, a servo oil cylinder, a hydraulic substation, an oil distributor, a servo control system, and a protection and transfer cabinet. The static loading host computer and the oil source control host computer can remotely control and monitor the equipment status of the servo control system and the oil source power system respectively. As the power source of the servo loading system, the oil source power system is responsible for delivering the high-pressure hydraulic oil required for the system to work. The oil distributor divides the high-pressure hydraulic oil output by the oil source power system into multiple outputs to the hydraulic substation. When the system or a certain channel is overhauled, the oil distributor or a certain channel circuit of the oil distributor can be closed. The hydraulic substation is the secondary pressure regulating unit of the servo loading system, which can perform secondary regulation and pressure stabilization on the high-pressure oil provided by the oil distributor and filter the oil. When an emergency occurs in the system, the hydraulic substation can immediately cut off the oil supply circuit and unload the loading power. The main function of the oil source cooling system is to cool the oil source equipment and oil to ensure the normal operation and work efficiency of the hydraulic system. The servo cylinder performs loading actions according to the test instructions. The servo control system adjusts the oil supply flow of the oil source power system through real-time feedback from the displacement and load sensors of the servo cylinder to achieve precise control of the output displacement or output force of the servo cylinder, thereby forming a closed-loop control system for static force. During the test, manual intervention can be performed at any time on loading, unloading, starting, stopping, loading rate, control parameters and emergency unloading, such as adjusting PID parameters, valve control parameters, holding, accelerating, increasing, decreasing, unloading, etc., to ensure the accuracy of the test. The static controller 7 is connected to the static loading host computer 3.

[0038] It should be noted that the temperature measurement system is composed of a sensor, a data acquisition instrument, and a temperature measurement system host computer. The temperature sensor uses two copper-nickel alloys as measuring wires, which are connected together to form a closed loop. A potential difference is generated based on the principle of thermoelectric effect. The voltage signal is sampled by the data acquisition instrument and converted into a temperature measurement value through the temperature-potential relationship to realize the collection of temperature values. The temperature value is displayed, analyzed and processed in real time by the temperature measurement system host computer, and can also be saved for secondary processing.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A static-thermal combined closed-loop control test system, characterized in that: Including heating subsystem, liquid cooling subsystem, sealing subsystem, static loading subsystem and temperature measurement system; The heating subsystem uses a circular array quartz lamp group for the heater to perform radiation heating on the test piece; the real-time temperature value of the temperature control point sensor is fed back to the heating controller through the signal conditioning module, and the control signal is output to the thyristor through the PID closed-loop control algorithm to control the thyristor trigger angle to adjust the voltage waveform; The liquid cooling subsystem cools the reflector plate and the quartz lamp by using a series structure flow channel for the heater reflector plate and the upper and lower copper plates; the water in the water tank is driven by a water pump to flow through the refrigeration device along the circulation pipeline to take away the heat on the heater cold plate, thereby achieving liquid cooling circulation control; The sealing subsystem realizes an oxygen-free test environment and filters the gas in the cabin by assembling the loading frame into a transparent nitrogen-filled sealed cabin and installing a gas internal circulation filter device; The static loading subsystem installs the actuator to the specimen loading position, and after the displacement sensor feeds back the displacement value to the servo valve to complete the connection between the loading fixture and the actuator, the force load control is switched and the oil source oil pressure is adjusted to achieve static closed-loop control; The temperature measurement system collects temperature signals for real-time display, storage, analysis and processing.

2. A static-thermal combined closed-loop control test system according to claim 1, characterized in that: The heating subsystem comprises a thyristor (5), a signal conditioning module (8), a heater (26), a heating controller (4), and a temperature sensor, wherein the heater (26) comprises an annular upper copper plate (32), an upper copper plate water cooling channel (33), a copper column mounting hole (34), a reflector plate water cooling channel (35), a mounting clamp (36), a reflector (37), an annular lower copper plate (38), a lower copper plate water cooling channel (39), a specimen fixing fixture (28), a heater support seat (27), an outer wall plate (40), a rib plate (42), and a ceramic column (41); the reflector plate (37), the outer wall plate (40), and the rib plate (42) are designed as a liquid cooling cold plate with a double ear clamp, and are connected to the mounting clamp (36). The heater (26) is fixedly enclosed to form a ring-shaped heater (26), the inner cavity of which is the water-cooling channel (35) of the reflector plate, and the grooves on the ring-shaped upper copper plate (32) and the ring-shaped lower copper plate (38) are the upper copper plate water-cooling channel (33) and the lower copper plate water-cooling channel (39); the copper columns are screwed into the copper column mounting holes (34) at both ends to fix the quartz lamp array, and the ceramic column (41) is used as an electrical connector of the heater (26); the temperature control point sensor is connected to the signal conditioning module (8) and the heating controller (4) in sequence, and the heater (26) and the thyristor (5) are connected, and then the heating controller (4) and the thyristor (5) and the upper computer (1) of the heating loading system are connected in sequence to realize the temperature closed-loop control function of the heater (26) and the application of aerodynamic heat load.

3. A static-thermal combined closed-loop control test system according to claim 2, characterized in that: The temperature measurement system comprises a sensor, a temperature measuring instrument (6) and a temperature detection host computer (2); the temperature measuring instrument (6) is connected to the temperature monitoring point sensor and the temperature detection host computer (2) in sequence to achieve real-time collection and monitoring of temperature test data.

4. A static-thermal combined closed-loop control test system according to claim 3, characterized in that: The liquid cooling subsystem comprises a water pump (18), a pipeline, a liquid cooling cold plate, a refrigeration device (16), and a water tank (17); wherein the refrigeration device (16) comprises an evaporator (44), a compressor (46), a condenser (47), and a throttle valve (45); the water pump (18) drives the water in the water tank (17) to flow along the circulation pipeline through the water divider (43) to the annular upper copper plate (32), the liquid cooling cold plate, and the annular lower copper plate (38), and then flows into the evaporator (44) in the refrigeration device (16) through the water divider (43); the refrigerant absorbs the heat of the water and vaporizes in the evaporator (44), is adiabatically compressed into high-temperature and high-pressure gas by the compressor (46), and is heat exchanged with air in the condenser (47) in cooperation with a cooling fan. After releasing heat, it is condensed into liquid, and after expansion and pressure reduction by the throttle valve (45), it enters the evaporator (44), vaporizes again and absorbs the heat of the water, thereby achieving the purpose of circulating water cooling.

5. The static-thermal combined closed-loop control test system according to claim 4 is characterized in that: The sealing subsystem comprises a sealing cabin (59), an internal circulation fan (12), an internal circulation air duct (10), a flow valve (11), a filtering device (14), and an oxygen detector (13), wherein the sealing cabin (59) comprises a mounting base (30), a base (29), a column (23), an air duct support plate (25), an air duct fixing plate (20), a top cover (19), and a film (24); the mounting base (30) is hoisted onto the test bearing foundation (31), and the base (29) is hoisted to the center position of the mounting base (30) to form a stable and reliable connection with the test foundation (31); the column (23) is hoisted to the base (29), and the top cover (19) is hoisted to the hole position of the column (23) in sequence, and the hole position of the column (23) is aligned and installed to complete the assembly of the sealing cabin (59); the servo cylinder (22) is lifted to a specified installation height by a forklift, and is connected to the column (23); the bottom connection of the antenna cover structure is connected The connecting ring is connected to the test fixture (28), and the loading fixture (21) of the sleeve ring design is installed from the top of the antenna cover structure. The heater support seat (27), the test fixture (28) and the base (29) are connected in sequence, and then connected to the heater (26) through the waist hole on the installation clamp (36), so as to complete the overall assembly of the heater (26); the air duct support plate (25) is connected to the base (29), the air duct fixing plate (20) and the air duct support plate (25) in sequence, the internal circulation air duct (10) is connected to the air duct fixing plate (20) and the internal circulation fan (12), and the square flange adapter is connected to the internal circulation fan (12) and the box filter (14), so as to complete the installation of the internal circulation gas filtration system; the external sampling extension pipe mouth of the pump suction oxygen detector (13) is placed at the bottom of the sealed cabin (59), so as to realize the long-distance suction sampling of the gas in the sealed cabin (59).

6. A static-thermal combined closed-loop control test system according to claim 5, characterized in that: The static loading subsystem comprises a static loading host computer (3), an oil source control host computer (52), an oil source power system (57), an oil source cooling system (58), a servo oil cylinder (22), a hydraulic substation (55), an oil distributor (56), a servo control system (53), and a protection and transfer cabinet (54): the oil source control host computer (52) sends a control signal to the oil source power system (59), and then divides the high-pressure hydraulic oil output by the oil source power system (57) into multiple paths and outputs them to the hydraulic substation (55) through the oil distributor (56), and then outputs them to the servo oil cylinder (22); the oil source cooling system (58) cools the oil source equipment and oil; the static loading host computer (3) sends a control signal, which is processed by the servo control system (53) and the protection and transfer cabinet (54) before arriving at the servo oil cylinder (22); the servo oil cylinder (22) The loading action is performed according to the test instruction. The servo control system (53) accurately controls the output displacement or output force of the servo cylinder (22) through real-time feedback of the displacement of the servo cylinder (22) and the load sensor; the servo cylinder (22) is connected to the loading fixture (21), the film (24) is surrounded along the wall panels on the installation bottom plate (30) and the top cover (19), and the sealed cabin (59) is finally sealed. The ventilation fan (9) is fixed at the air outlet above the film (24), the AC power supply (51) is turned on, the ventilation fan (9) and the internal circulation fan (12) are started, the oxygen detector (14) is turned on, the gate valve (49) of the liquid nitrogen (15) is opened, the booster valve (48) of the liquid nitrogen (15) is turned, the flow valve (50) is turned, and nitrogen is injected into the sealed cabin (59) until the oxygen concentration reaches the target value, and the formal test begins.

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