A pneumatic control loop for nozzle load simulation

Abstract

This invention relates to the field of rocket engine nozzle testing technology, specifically disclosing a pneumatic control loop for nozzle load simulation. The loop includes a servo control loop, a manual control loop, an electronically controlled pressure regulating valve control loop, a master control valve, and a master controller. The servo control loop includes a first pressure regulating valve, and the electronically controlled pressure regulating valve control loop includes a second pressure regulating valve and an electronic pressure controller. The master controller provides working air pressure to the electronic pressure controller by controlling the second pressure regulating valve, and the electronic pressure controller controls the opening of the first pressure regulating valve. This invention uses high-pressure gas from a gas source, which enters the servo control loop or manual control loop through the master control valve before being input into the actuation chamber. This simulates the frictional torque experienced by the rocket engine nozzle, enabling a semi-physical simulation experiment of the nozzle. The electronic pressure controller acts as a pilot valve, controlling the gap between the valve core and valve seat in the first pressure regulating valve, thereby achieving precise control of the valve opening and a wider pressure regulation range.

Description

Technical Field

[0001] This invention relates to the field of rocket engine nozzle testing technology, and in particular to a pneumatic control loop for nozzle load simulation. Background Technology

[0002] The nozzle is a crucial component of a rocket engine. Installing a servo mechanism on the nozzle allows for its oscillation control, thus significantly determining the rocket's flight attitude. During flight, the loads overcome by the servo mechanism driving the nozzle's oscillation include frictional torque and aerodynamic combined torque. In ground-based hardware-in-the-loop simulations, hydraulic load simulation systems are typically used to simulate the frictional torque acting on the nozzle. While hydraulic load simulation systems offer superior accuracy, stiffness, and dynamic performance, they are also more expensive and require higher maintenance. In contrast, aerodynamic load simulation systems offer the advantage of rapid response and are increasingly favored by companies.

[0003] Whether it is a hydraulic load simulation system or a pneumatic load simulation system, the most important thing is to achieve precise control of the valve core position, so as to achieve a larger adjustment range and more accurate control. However, the control circuit structure of the existing pneumatic load system is relatively complex, and it is easy to affect the experimental results due to improper operation during the experiment. In addition, the complex structure also leads to high experimental costs. Based on the above problems, how to simplify the control circuit structure of the pneumatic load simulation system while ensuring the control effect is an urgent problem to be solved. Summary of the Invention

[0004] To address the technical problems in the prior art, the present invention provides a pneumatic control loop for nozzle load simulation.

[0005] This invention discloses a pneumatic control circuit for nozzle load simulation. The pneumatic control circuit includes a servo control circuit, a manual control circuit, a master control valve, and a master controller. The gas input terminals of the servo control circuit and the manual control circuit are both connected to the output terminal of the master control valve. The gas output terminals of the servo control circuit and the manual control circuit are both connected to the actuation chamber. The gas input terminal of the master control valve is connected to a gas source. The master controller is electrically connected to the master control valve. Wherein:

[0006] The servo control loop includes a first pressure regulating valve; the gas input end of the first pressure regulating valve is connected to the output end of the main control valve through a gas supply pipeline, and the gas output end of the first pressure regulating valve is connected to the actuation chamber through a gas supply pipeline.

[0007] The manual control circuit includes a manual pressure regulating valve; the gas input end of the manual pressure regulating valve is connected to the output end of the main control valve through a gas supply pipeline, and the gas output end of the manual pressure regulating valve is connected to the actuation chamber through a gas supply pipeline.

[0008] The pneumatic control circuit also includes an electrically controlled pressure regulating valve control circuit, which includes a second pressure regulating valve and an electronic pressure controller. The second pressure regulating valve is electrically connected to the main controller. The gas input terminal of the second pressure regulating valve is connected to the input or output terminal of the main control valve through a gas supply pipeline. The gas output terminal of the second pressure regulating valve is connected to the gas input terminal of the electronic pressure controller through a gas supply pipeline. The gas output terminal of the electronic pressure controller is connected to the pilot port of the first pressure regulating valve through a gas supply pipeline. The main controller provides working gas pressure to the electronic pressure controller by controlling the second pressure regulating valve. The electronic pressure controller controls the opening degree of the first pressure regulating valve.

[0009] Furthermore, the servo control circuit also includes a first pressure relief valve, and a first pressure relief branch is provided on the gas supply pipeline from the gas output end of the first pressure regulating valve to the actuation chamber. The first pressure relief valve is installed on the first pressure relief branch; the first pressure relief valve is electrically connected to the main controller.

[0010] Furthermore, the manual control circuit also includes a second pressure relief valve. A second pressure relief branch is provided on the gas supply pipeline from the gas output end of the manual pressure regulating valve to the actuation chamber, and the second pressure relief valve is installed on the second pressure relief branch.

[0011] Furthermore, the servo control circuit also includes a first plug group, which is disposed on the gas output end of the first pressure regulating valve and the gas supply line connecting the actuation chamber. When the first plug group is in the plugged-in state, the gas output end of the first pressure regulating valve is connected to the gas supply line of the actuation chamber, and when the first plug group is in the disconnected state, the gas output end of the first pressure regulating valve is disconnected from the gas supply line of the actuation chamber.

[0012] Furthermore, the manual control circuit also includes a second plug group, which is disposed on the gas output end of the manual pressure regulating valve and the gas supply line connecting the actuation chamber. When the second plug group is plugged in, the gas output end of the manual pressure regulating valve is connected to the gas supply line of the actuation chamber. When the second plug group is disconnected, the gas output end of the manual pressure regulating valve is disconnected from the gas supply line of the actuation chamber.

[0013] Furthermore, the servo control loop also includes a first pressure detector, which is installed at the connection between the gas output end of the first pressure regulating valve and the gas supply line to the actuation chamber and the first pressure relief branch; the first pressure detector is electrically connected to the electronic pressure controller, which controls the opening degree of the first pressure regulating valve according to the pressure detection value of the first pressure detector.

[0014] Furthermore, the manual control circuit also includes a second pressure detector, which is installed on the gas supply line between the gas output end of the manual pressure regulating valve and the second pressure relief branch.

[0015] Furthermore, the control circuit of the electronically controlled pressure regulating valve also includes a third pressure detector, which is installed on the gas supply line from the second pressure regulating valve to the electronic pressure controller; the third pressure detector is electrically connected to the main controller, and the main controller controls the opening degree of the second pressure regulating valve through the pressure detection value of the third pressure detector.

[0016] Furthermore, the pneumatic control circuit also includes a fourth pressure detector, which is installed on the gas supply pipeline connected to the gas source at the gas input end of the main control valve; the fourth pressure detector is electrically connected to the main controller.

[0017] This invention discloses a pneumatic control loop for nozzle load simulation, comprising a servo control loop, a manual control loop, a master control valve, and a master controller. The gas input terminals of both the servo control loop and the manual control loop are connected to the output terminal of the master control valve, and the gas output terminals of both are connected to the actuation chamber. The gas input terminal of the master control valve is connected to a gas source. High-pressure gas output from the gas source enters the servo control loop and / or the manual control loop through the master control valve and is then input into the actuation chamber, thereby simulating the frictional torque experienced by a rocket engine nozzle. This enables a semi-physical simulation experiment of the rocket engine nozzle. Compared to hydraulic load simulation systems, it offers the advantage of rapid operation. Compared to existing pneumatic load simulation systems, it features simplified loop design, reduced experimental costs, and reliable control. The servo control loop includes a first pressure regulating valve, whose opening is controlled by an electrically controlled pressure regulating valve control loop, thus achieving electric control of the servo control loop. Manual control can also be achieved by adjusting the manual pressure regulating valve in the manual control loop, further meeting different experimental needs.

[0018] Furthermore, in the control circuit of the electronically controlled pressure regulating valve, the gas input end of the second pressure regulating valve is connected to the input or output end of the main control valve through a gas supply pipeline, and the gas output end is connected to the gas input end of the electronic pressure controller through a gas supply pipeline. The gas output end of the electronic pressure controller is connected to the pilot port of the first pressure regulating valve through a gas supply pipeline. The main controller provides working gas pressure to the electronic pressure controller by controlling the second pressure regulating valve. The electronic pressure controller acts as a pilot valve to control the gap between the valve core and the valve seat in the first pressure regulating valve, thereby achieving control of the opening degree of the first pressure regulating valve. This invention controls the output pressure of the electronic pressure controller through a wider pressure range of gas pressure, thereby achieving precise control of the valve opening and achieving a larger pressure regulation range. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a nozzle load simulation test according to an embodiment of the present invention;

[0021] Figure 2 This is a structural diagram of a pneumatic control circuit for nozzle load simulation according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a pneumatic control circuit for nozzle load simulation according to another embodiment of the present invention;

[0023] Among them, 1-servo mechanism, 2-action chamber, 3-swing center, 4-nozzle, 5-air source, 100-pneumatic control circuit, 101-servo control circuit, 1011-first pressure regulating valve, 1012-first pressure relief valve, 1013-first plug group, 1014-first pressure detector, 102-manual control circuit, 1021-manual pressure regulating valve, 1022-second pressure relief valve, 1023-second plug group, 1024-second pressure detector, 103-master control valve, 104-electric pressure regulating valve control circuit, 1041-second pressure regulating valve, 1042-electronic pressure controller, 1043-third pressure detector, 105-fourth pressure detector. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0025] In the hardware-in-the-loop simulation experiment of the servo mechanism, such as Figure 1 As shown, when the servo mechanism pushes the nozzle to rotate around the pivot point, it fills the actuation chamber with an appropriate amount of gas. While the nozzle oscillates, it squeezes the actuation chamber and generates frictional force through friction with the actuation chamber, simulating the frictional torque experienced by the nozzle. This invention simulates the frictional torque experienced by the nozzle through a pneumatic control circuit. The load simulation is transformed from the existing hydraulic form to a pneumatic mode, increasing the diversity of load simulation control and reducing costs. This invention provides a pneumatic control circuit for nozzle load simulation, addressing the pressure supply and control of the gas within the actuation chamber.

[0026] Specifically, an embodiment of the present invention provides a pneumatic control loop for nozzle load simulation, such as... Figure 2 As shown, the pneumatic control circuit 100 includes a servo control circuit 101, a manual control circuit 102, a master control valve 103, and a master controller (not shown in the figure). The gas input terminals of the servo control circuit 101 and the manual control circuit 102 are both connected to the output terminal of the master control valve 103. The gas output terminals of the servo control circuit 101 and the manual control circuit 102 are both connected to the actuation chamber 2. The gas input terminal of the master control valve 103 is connected to the gas source 5. The master controller is electrically connected to the master control valve 103. Wherein:

[0027] The servo control loop 101 includes a first pressure regulating valve 1011; the gas input end of the first pressure regulating valve 1011 is connected to the output end of the main control valve 103 through a gas supply pipeline, and the gas output end of the first pressure regulating valve 1011 is connected to the actuation chamber 2 through a gas supply pipeline.

[0028] The manual control circuit 102 includes a manual pressure regulating valve 1021; the gas input end of the manual pressure regulating valve 1021 is connected to the output end of the main control valve 103 through a gas supply pipeline, and the gas output end of the manual pressure regulating valve 1021 is connected to the actuation chamber 2 through a gas supply pipeline.

[0029] The pneumatic control circuit 100 also includes an electrically controlled pressure regulating valve control circuit 104, which includes a second pressure regulating valve 1041 and an electronic pressure controller 1042. The second pressure regulating valve 1041 is electrically connected to the main controller. The gas input end of the second pressure regulating valve 1041 is connected to the input or output end of the main control valve 103 through a gas supply line. The gas output end of the second pressure regulating valve 1041 is connected to the gas input end of the electronic pressure controller 1042 through a gas supply line. The gas output end of the electronic pressure controller 1042 is connected to the pilot port of the first pressure regulating valve 1011 through a gas supply line. The main controller provides working air pressure to the electronic pressure controller 1042 by controlling the second pressure regulating valve 1041. The electronic pressure controller 1042 controls the opening degree of the first pressure regulating valve 1011.

[0030] In this embodiment of the invention, the main control valve 103 is used to control the opening and closing of the air path between the air source 5 and the servo control loop 101 and the manual control response 102. Therefore, a two-way valve can be used to achieve this function. The specific control principle and product model are not limited in this embodiment of the invention. When the main control valve 103 is in the open state, if the first pressure regulating valve 1011 is in the open state, the servo control loop 101 is connected. If the manual pressure regulating valve 1021 is in the open state, the manual control loop 102 is connected. By controlling the states of the three valves, the main control valve 103, the first pressure regulating valve 1011, and the manual pressure regulating valve 1021, it is possible to achieve the connection of a single control loop (servo control loop 101 or manual control loop 102) or the simultaneous connection / closure of two control loops (servo control loop 101 and manual control loop 102), which meets the experimental requirements and simplifies the loop structure and reduces costs.

[0031] The manual control loop 102 is used as follows during nozzle load simulation tests:

[0032] The gas in the gas source 5 enters the manual control circuit 102 through the main control valve 103. The test personnel manually adjust the manual pressure regulating valve 1021 to control the pressure of the gas delivered to the action chamber 2, thus completing the manual gas intake in the action chamber 2.

[0033] The usage process of the servo control loop 101 during the nozzle load simulation test is as follows:

[0034] Gas from gas source 5 enters servo control circuit 101 via main control valve 103, and also enters electronic pressure regulating valve control circuit 104. Since the opening degree of first pressure regulating valve 1011 determines the pressure of gas supplied to actuation chamber 2, the opening degree of second pressure regulating valve 1041 is controlled first to ensure that the gas pressure output by second pressure regulating valve 1041 remains stable and reaches the working pressure of electronic pressure controller 1042, thus providing working air pressure for electronic pressure controller 1042. Electronic pressure controller 1042 relies on this... The air pressure enters the working state; the electronic pressure controller 1042 acts as a pilot valve, and its outlet is connected to the pilot port of the first pressure regulating valve 1011. By controlling the output pressure of the electronic pressure controller 1042, the main valve core of the first pressure regulating valve 1011 can be precisely controlled (adjusting the gap between the valve core and the valve seat), so that the opening of the first pressure regulating valve 1011 meets the test requirements. In this way, the first pressure regulating valve 1011 delivers gas pressure to the action chamber 2, completing the gas intake in the action chamber 2, and also has a larger pressure regulation range.

[0035] like Figure 2 and 3As shown, these are two implementation methods where the gas input end of the second pressure regulating valve 1041 is connected to the input and output ends of the main control valve 103 via a gas pipeline. Figure 2 In the manner shown, the gas input end of the second pressure regulating valve 1041 is directly connected to the gas source 5. Since the gas pressure output by the gas source 5 is relatively high, the gas source 5 can directly provide the second pressure regulating valve 1041 with a wider range of gas pressure, reducing intermediate links, and the system response speed is fast, which also meets the working requirements of the electronic pressure controller 1042. Figure 3 In the manner shown, the gas input end of the second pressure regulating valve 1041 is connected to the gas output end of the main control valve 103. Since the gas output from the gas source 5 flows out through the main control valve 103, the gas pressure range will be relatively limited, and the response speed will also be reduced. Therefore, in this implementation method, the main control valve 103 with greater fluid capacity and less pressure loss is selected. A pressure stabilizing device is added between the main control valve 103 and the second pressure regulating valve 1041 to reduce pressure fluctuations, and the test results will be better.

[0036] Preferably, in this embodiment, the servo control circuit 101 and the manual control circuit 102 are not used simultaneously during the test. The servo control circuit 101 is an electric control circuit, which is simpler and more accurate to operate and is a more commonly used control circuit.

[0037] In this embodiment of the invention, the action chamber 2 needs to reach the target pressure value through the air source 5 and the pneumatic control circuit of this embodiment in order to meet the semi-physical simulation experiment of the servo mechanism. The opening degree of the first pressure regulating valve 1011 and the manual pressure regulating valve 1021 determines the inflation process of the action chamber 2. Taking the control process of servo control loop 101 as an example, the adjustment of the opening of the first pressure regulating valve 1011 during the inflation process of the actuating chamber 2 should be divided into at least two stages. In the first stage, the opening of the first pressure regulating valve 1011 is at its maximum. The maximum opening does not mean that the valve is fully open, but rather that the opening ratio during the inflation process is at its maximum value. In this stage, the pressure difference between the air source and the actuating chamber 2 can be used to achieve rapid inflation, thereby shortening the inflation time. In the second stage, the opening of the first pressure regulating valve 1011 will be gradually reduced to decrease the flow rate of the inflation gas and avoid overshoot. In this stage, the main controller needs to control the opening of the second pressure regulating valve 1041 to provide working air pressure for the electronic pressure controller 1042. The output pressure of the electronic pressure controller 1042 is continuously adjusted to control the opening of the first pressure regulating valve 1011 to decrease. Moreover, the decrease in the opening of the first pressure regulating valve 1011 is non-linear. Preferably, the following calculation formula is constructed based on the PID control principle to determine the adjustment parameters for the adjustment of the opening of the first pressure regulating valve 1011:

[0038]

[0039] in, This belongs to the first stage. It belongs to the second stage; The set value is based on the target pressure value of the actuation chamber 2 and the target pressure value of the air source 5. The pipe diameter and length are determined after calculation. The PID calculation model includes proportional, integral, and derivative terms, and represents the functional relationship between time t and the valve opening A of the first pressure regulating valve 1011. The proportional gain, integral gain, and derivative gain values ​​were all obtained through multiple experimental adjustments. Furthermore, the measured value P of the output air pressure of air source 5 and the target pressure value of air source 5 were added. The correction factor for the two is obtained by... Calculate when the measured value Less than the target value When the correction factor is greater than 1, it is equivalent to increasing the opening of the first pressure regulating valve 1011 compared to the normal condition, while when the measured value... Greater than the target value When the correction coefficient is less than 1, it is equivalent to reducing the opening of the first pressure regulating valve 1011 compared to the normal situation, so as to reduce the impact of the actual output air pressure of the air source 5 on the inflation process.

[0040] Whether the actuation chamber 2 is pressurized via servo control circuit 101 or manual control circuit 102, when the actuation chamber 2 needs depressurization, the connection between the gas source 5 and the main control valve 103 can be designed to be disconnectable, allowing the gas to leak out in the opposite direction to the original delivery route. More preferably, the first pressure regulating valve 1011 is an electrically controlled pressure regulating valve with a built-in pressure relief port; opening the pressure relief port achieves depressurization. When the actuation chamber 2 needs emergency depressurization, the servo control circuit 101 in this embodiment also includes a first pressure relief valve 1012. A first pressure relief branch is provided on the gas delivery pipeline from the gas output end of the first pressure regulating valve 1011 to the actuation chamber 2. The first pressure relief valve 1012 is installed on the first pressure relief branch, and the first pressure relief valve 1012 is electrically connected to the main controller. The main controller controls the state of the first pressure relief valve 1012, and opening it achieves emergency depressurization. In this embodiment, the first pressure relief valve 1012 can be an electric ball valve, and the specific product specifications are not limited.

[0041] Furthermore, the manual control circuit 102 in this embodiment may also include a second pressure relief valve 1022. A second pressure relief branch is provided on the gas supply pipeline from the gas output end of the manual pressure regulating valve 1021 to the actuation chamber 2, and the second pressure relief valve 1022 is installed on the second pressure relief branch. In this embodiment, the second pressure relief valve 1022 is a manually adjustable valve. When gas is supplied to the actuation chamber 2 using the manual control circuit 102, the pressure in the actuation chamber 2 can be relieved by manually adjusting the state of the second pressure relief valve 1022.

[0042] Specifically, the servo control circuit 101 also includes a first plug group 1013. The first plug group 1013 is disposed on the gas supply line connecting the gas output end of the first pressure regulating valve 1011 and the actuation chamber 2. When the first plug group 1013 is in the plugged-in state, the gas supply line from the gas output end of the first pressure regulating valve 1011 to the actuation chamber 2 is connected. When the first plug group 1013 is in the disconnected state, the gas supply line from the gas output end of the first pressure regulating valve 1011 to the actuation chamber 2 is cut off.

[0043] Specifically, the manual control circuit 102 also includes a second plug group 1023. The second plug group 1023 is disposed on the gas output end of the manual pressure regulating valve 1021 and the gas supply line connecting the actuation chamber 2. When the second plug group 1023 is in the plugged-in state, the gas output end of the manual pressure regulating valve 1021 is connected to the gas supply line of the actuation chamber 2. When the second plug group 1023 is in the disconnected state, the gas output end of the manual pressure regulating valve 1021 is disconnected from the gas supply line of the actuation chamber 2.

[0044] In this embodiment of the invention, a first plug group 1013 and a second plug group 1023 are provided. The air passage between the servo control circuit 101 and the manual control circuit 102 and the actuation chamber 2 can be switched on and off manually by plugging and unplugging. The structural details of the first plug group 1013 and the second plug group 1023 are not specifically limited in this embodiment. As an example, a structure including a female plug a and a male plug b can be selected. When the female and male plugs are connected, the air passage is connected; when the male and female plugs are disconnected, the air passage is disconnected. The design of the first plug group 1013 and the second plug group 1023 enables rapid switching of the air supply line. After the gas enters the main control valve 103 from the gas source, it passes through the air supply pipeline, through the first pressure regulating valve 1011 or the manual pressure regulating valve 1021, and then through the first plug group 1013 or the second plug group 1023 before entering the actuation chamber 2, completing the automatic air intake of the actuation chamber 2.

[0045] Specifically, in this embodiment of the invention, the servo control loop 101 further includes a first pressure detector 1014, which is installed at the connection between the gas output end of the first pressure regulating valve 1011 and the gas supply pipeline to the actuation chamber 2 and the first pressure relief branch. The first pressure detector 1014 monitors the gas pressure input to the actuation chamber 2 in real time. If the pressure detection value is lower than the set value, the electronic pressure controller 1042 outputs a signal to increase the opening of the first pressure regulating valve 1011, thereby increasing the gas pressure in the pipeline. When the pressure detection value is higher than the set value, the electronic pressure controller 1042 outputs a signal to decrease the opening of the first pressure regulating valve 1011, thereby reducing the gas pressure in the pipeline. In this embodiment, the first pressure detector 1014 is electrically connected to the electronic pressure controller 1042. The electronic pressure controller 1042 uses the gas pressure input to the actuation chamber 2 as its reference for the first pressure regulating valve 1011, and controls the opening of the first pressure regulating valve 1011 according to the pressure detection value of the first pressure detector 1014, thereby achieving closed-loop control and further ensuring the stability and safety of the gas supply process. In this embodiment, a pressure sensor can be used to measure gas pressure and upload signals. The specific product type of the sensor is not limited.

[0046] Specifically, the manual control loop 102 also includes a second pressure detector 1024, which is installed on the gas supply pipeline between the gas output end of the manual pressure regulating valve 1021 and the second pressure relief branch. In this embodiment, the second pressure detector 1024 is preferably a pressure gauge. When the gas pressure is adjusted by manually adjusting the opening of the manual pressure regulating valve 1021, the test personnel operate the manual pressure regulating valve 1021 by observing the display of the pressure gauge.

[0047] Specifically, the electronically controlled pressure regulating valve control circuit 104 in this embodiment of the invention further includes a third pressure detector 1043, which is installed on the gas supply line from the second pressure regulating valve 1041 to the electronic pressure controller 1042. The third pressure detector 1043 is electrically connected to the main controller, which controls the opening degree of the second pressure regulating valve 1041 based on the pressure detection value of the third pressure detector 1043. The electronic pressure controller 1042 requires input gas as a driving pressure signal source, so a third pressure detector 1043 is installed at the output end of the second pressure regulating valve 1041, with its pressure detection value serving as a reference for controlling the opening degree of the second pressure regulating valve 1041.

[0048] Specifically, the pneumatic control circuit 100 in this embodiment of the invention further includes a fourth pressure detector 105, which is installed on the gas supply pipeline connecting the gas input end of the main control valve 103 to the gas source 5; the fourth pressure detector 105 is electrically connected to the main controller. The fourth pressure detector 105 is used to measure the pressure of the gas output from the gas source 5. The main controller can monitor the detection value of the fourth pressure detector 105 and shut off the main control valve 103 if the test requirements are not met, or adjust the opening of the main control valve 103 according to the detection value of the fourth pressure detector 105 to achieve the required gas pressure for the test. In this embodiment, the fourth pressure detector 105 can be a pressure gauge for on-site visualization of the detection value.

[0049] It should be noted that the main controller in this embodiment of the invention has the functions of information acquisition and control of the status of certain devices according to a set program, while the electronic pressure controller 1042 also has the functions of information acquisition and device status control. These two components can be integrated into one product or set independently according to the product model selection, and both are within the protection scope of this invention.

[0050] This invention discloses a pneumatic control circuit for nozzle load simulation, comprising a servo control circuit, a manual control circuit, a master control valve, and a master controller. The gas input terminals of both the servo control circuit and the manual control circuit are connected to the output terminal of the master control valve. The gas output terminals of both the servo control circuit and the manual control circuit are connected to the actuation chamber. The gas input terminal of the master control valve is connected to a gas source. High-pressure gas output from the gas source enters the servo control circuit and / or the manual control circuit through the master control valve and is then input into the actuation chamber, thereby simulating the frictional torque experienced by a rocket engine nozzle. This enables a semi-physical simulation experiment of the rocket engine nozzle. Compared to hydraulic load simulation systems, it offers the advantage of rapid operation. Compared to existing pneumatic load simulation systems, it offers advantages such as simplified circuit design, reduced experimental costs, and reliable control. The servo control circuit includes a first pressure regulating valve, whose opening is controlled by an electrically controlled pressure regulating valve control circuit, thus achieving electric control of the servo control circuit. Manual control can also be achieved by adjusting the manual pressure regulating valve in the manual control circuit, further meeting different experimental needs.

[0051] Furthermore, in the control circuit of the electrically controlled pressure regulating valve of this embodiment, the gas input end of the second pressure regulating valve is connected to the input or output end of the main control valve through a gas supply pipeline, and the gas output end is connected to the gas input end of the electronic pressure controller through a gas supply pipeline. The gas output end of the electronic pressure controller is connected to the pilot port of the first pressure regulating valve through a gas supply pipeline. The main controller provides working gas pressure to the electronic pressure controller by controlling the second pressure regulating valve. The electronic pressure controller acts as a pilot valve to control the gap between the valve core and the valve seat in the first pressure regulating valve, thereby achieving control of the opening degree of the first pressure regulating valve. This invention controls the output pressure of the electronic pressure controller through a wider pressure range of gas pressure, thereby achieving precise control of the valve opening degree and achieving a larger pressure regulation range.

[0052] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the nature and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention.

Claims

1. A pneumatic control loop for nozzle load simulation, characterized in that, The pneumatic control circuit includes a servo control circuit, a manual control circuit, a master control valve, and a master controller. The gas input terminals of the servo control circuit and the manual control circuit are both connected to the output terminal of the master control valve. The gas output terminals of the servo control circuit and the manual control circuit are both connected to the actuation chamber. The gas input terminal of the master control valve is connected to a gas source. The master controller is electrically connected to the master control valve. Wherein: The servo control loop includes a first pressure regulating valve; the gas input end of the first pressure regulating valve is connected to the output end of the main control valve through a gas supply pipeline, and the gas output end of the first pressure regulating valve is connected to the actuation chamber through a gas supply pipeline. The manual control circuit includes a manual pressure regulating valve; the gas input end of the manual pressure regulating valve is connected to the output end of the main control valve through a gas supply pipeline, and the gas output end of the manual pressure regulating valve is connected to the actuation chamber through a gas supply pipeline. The pneumatic control circuit also includes an electrically controlled pressure regulating valve control circuit, which includes a second pressure regulating valve and an electronic pressure controller. The second pressure regulating valve is electrically connected to the main controller. The gas input terminal of the second pressure regulating valve is connected to the input or output terminal of the main control valve via a gas supply pipeline. The gas output terminal of the second pressure regulating valve is connected to the gas input terminal of the electronic pressure controller via a gas supply pipeline. The gas output terminal of the electronic pressure controller is connected to the pilot port of the first pressure regulating valve via a gas supply pipeline. The main controller provides working gas pressure to the electronic pressure controller by controlling the second pressure regulating valve. The electronic pressure controller controls the opening degree of the first pressure regulating valve. The servo control circuit further includes a first pressure relief valve. A first pressure relief branch is provided on the gas supply pipeline from the gas output end of the first pressure regulating valve to the actuation chamber. The first pressure relief valve is installed on the first pressure relief branch. The first pressure relief valve is electrically connected to the main controller. The servo control loop further includes a first pressure detector, which is installed at the connection between the gas output end of the first pressure regulating valve and the gas supply line to the actuation chamber and the first pressure relief branch; the first pressure detector is electrically connected to the electronic pressure controller, which controls the opening degree of the first pressure regulating valve according to the pressure detection value of the first pressure detector; The control circuit of the electronically controlled pressure regulating valve also includes a third pressure detector, which is installed on the gas supply line from the second pressure regulating valve to the electronic pressure controller. The third pressure detector is electrically connected to the main controller, and the main controller controls the opening degree of the second pressure regulating valve based on the pressure detection value of the third pressure detector.

2. The pneumatic control loop for nozzle load simulation as described in claim 1, characterized in that, The manual control circuit also includes a second pressure relief valve. A second pressure relief branch is provided on the gas supply pipeline from the gas output end of the manual pressure regulating valve to the actuation chamber, and the second pressure relief valve is installed on the second pressure relief branch.

3. The pneumatic control loop for nozzle load simulation as described in claim 1, characterized in that, The servo control circuit further includes a first plug group, which is disposed on the gas output end of the first pressure regulating valve and the gas supply line connecting the actuation chamber. When the first plug group is in the plugged-in state, the gas output end of the first pressure regulating valve is connected to the gas supply line of the actuation chamber. When the first plug group is in the disconnected state, the gas output end of the first pressure regulating valve is disconnected from the gas supply line of the actuation chamber.

4. The pneumatic control circuit for nozzle load simulation as described in claim 1, characterized in that, The manual control circuit also includes a second plug group, which is disposed on the gas output end of the manual pressure regulating valve and the gas supply line connecting the actuation chamber. When the second plug group is plugged in, the gas output end of the manual pressure regulating valve is connected to the gas supply line of the actuation chamber. When the second plug group is disconnected, the gas output end of the manual pressure regulating valve is disconnected from the gas supply line of the actuation chamber.

5. The pneumatic control loop for nozzle load simulation as described in claim 2, characterized in that, The manual control circuit also includes a second pressure detector, which is installed on the gas supply line between the gas output end of the manual pressure regulating valve and the second pressure relief branch.

6. The pneumatic control loop for nozzle load simulation as described in claim 1, characterized in that, The pneumatic control circuit also includes a fourth pressure detector, which is installed on the gas supply pipeline connected to the gas source at the gas input end of the main control valve; the fourth pressure detector is electrically connected to the main controller.

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