Diaphragm design method for rocket engine combustion chamber and nozzle high dynamic load test device

Abstract

The present invention discloses a diaphragm design method for a rocket engine combustion chamber and nozzle strong dynamic load test device, including the steps of: establishing a load distribution model of a shallow groove diaphragm and a steel wire rope, and calculating load distribution data; performing mechanical analysis on the shallow groove diaphragm and the steel wire rope to obtain the bearing performance data of the shallow groove diaphragm and the bearing performance data of the steel wire rope; based on the bearing performance data of the shallow groove diaphragm and the bearing performance data of the steel wire rope, adjusting the number of shallow grooves and the number of steel wire ropes according to the load distribution data to obtain a diaphragm structure with required bearing performance. The present invention adopts a distribution calculation method, obtains load distribution data by establishing a load distribution model, and after analyzing and obtaining the bearing performance data of the shallow groove diaphragm and the bearing performance data of the steel wire rope, adjusts the shallow groove diaphragm and the steel wire rope according to the load distribution data to obtain a diaphragm structure that better matches the test conditions, and the design is simple and the design structure has high accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of rocket engine design, and in particular to a diaphragm design method for a rocket engine combustion chamber and a nozzle strong dynamic load test device. Background Art

[0002] The performance verification of the rocket engine combustion chamber and nozzle is extremely important, and the strong dynamic load test is one of the key links in the technology research and development process. The strong dynamic load test device of the rocket engine combustion chamber and nozzle is driven by high-pressure air and energetic medium. The high-pressure air provides the initial power, and the energy is further released through the combustion or explosion of the energetic medium. The collaborative work accurately simulates the strong dynamic load environment faced by the rocket engine during startup and actual operation, including extremely complex pressure, temperature, speed, etc.

[0003] In the rocket engine combustion chamber and nozzle strong dynamic load test device, the instantaneous burst of energy will cause the magnitude and direction of the force to be highly uncertain and complex, and may come from impacts in multiple directions. The strong dynamic load environmental test device is a pulse-type equipment, which requires the use of a diaphragm to control the flow conditions. In order to simulate the actual strong dynamic load scenario, a diaphragm structure composed of a shallow groove diaphragm (shallow grooves engraved on the curved diaphragm) and a wire rope is used for strong dynamic load testing. However, during use, it is often necessary to adjust the test parameters (pressure load), which makes it difficult for the same diaphragm structure to be suitable for a variety of test conditions. Therefore, it is necessary to design a diaphragm structure with corresponding load-bearing performance according to the test conditions. However, the current diaphragm structure design usually adopts a method of continuous adjustment through experiments, that is, setting the parameters of a diaphragm structure, testing and recording it in the test, and adjusting the diaphragm structure according to the recorded structure, which requires a lot of experimental work, and the design is difficult and there are too many variables to obtain a better diaphragm structure.

[0004] At present, the existing design method of fine-tuning through experimental tests is difficult to adjust and the design process is complicated due to too many parameter variables, making it difficult to obtain a better diaphragm structure. Summary of the invention

[0005] The purpose of the present invention is to provide a diaphragm design method for a rocket engine combustion chamber and nozzle high dynamic load test device, so as to solve the technical problem that the design method used in the prior art through fine-tuning through experimental tests is difficult to adjust and the design process is complicated due to too many parameter variables, making it difficult to obtain a better diaphragm structure.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] The diaphragm design method of a rocket engine combustion chamber and nozzle strong dynamic load test device includes the following steps:

[0008] Step 100: Based on the diaphragm structure composed of the shallow groove diaphragm and the steel wire rope, a load distribution model of the shallow groove diaphragm and the steel wire rope is established by mechanical calculation, and after determining the bearing performance requirements of the diaphragm structure, the load distribution data of the shallow groove diaphragm and the steel wire rope are calculated by using the load distribution model;

[0009] Step 200: Perform mechanical analysis on the shallow groove diaphragm based on a finite element analysis method to obtain load-bearing performance data of the shallow groove diaphragm, and perform mechanical analysis on the steel wire rope based on a material mechanics analysis method to obtain load-bearing performance data of the steel wire rope;

[0010] Step 300: Based on the load-bearing performance data of the shallow groove diaphragm and the load-bearing performance data of the steel wire rope, the number of shallow grooves and the number of steel wire ropes are adjusted according to the load distribution data to obtain a diaphragm structure with required load-bearing performance.

[0011] As a preferred solution of the present invention, in step 100, the load distribution model is specifically established as follows:

[0012] Establish the relationship between the bearing pressure of the shallow groove diaphragm and the total pressure:

[0013] ;

[0014] Establish the relationship between the shallow groove diaphragm pressure and the total pressure of the wire rope reverse load:

[0015] ;

[0016] The load distribution relationship between the shallow groove diaphragm and the wire rope is obtained:

[0017] ;

[0018] in, They are the bearing pressure of the shallow groove diaphragm and the bearing pressure of the wire rope. is the total pressure, is the ratio of the shallow groove diaphragm bearing pressure to the total pressure, It is the ratio of the wire rope bearing pressure to the total pressure.

[0019] As a preferred solution of the present invention, in step 100, the specific method of calculating and obtaining the load distribution data of the shallow groove diaphragm and the wire rope using the load distribution model is:

[0020] Predetermine the load distribution ratio of the shallow groove diaphragm bearing pressure and the wire rope bearing pressure;

[0021] The shallow groove diaphragm is used to independently bear and apply pressure, measure the deformation of the shallow groove diaphragm, and establish the relationship between the deformation of the shallow groove diaphragm and the pressure applied by the shallow groove diaphragm:

[0022] ;

[0023] The shallow groove diaphragm and the steel wire rope are used to jointly bear the applied pressure, the deformation of the shallow groove diaphragm is measured, and the relationship between the deformation of the shallow groove diaphragm and the applied pressure is established:

[0024] ;

[0025] The load distribution relationship between the shallow groove diaphragm and the wire rope is obtained by combining:

[0026] ;

[0027] ;

[0028] in, Apply pressure, The deformation amount of the shallow groove diaphragm independently bearing the applied pressure, The deformation amount of the shallow groove diaphragm and the steel wire rope jointly bearing the pressure applied, is the relationship equation between the deformation of the shallow groove diaphragm when it independently bears the applied pressure, This is the relationship equation between the deformation of the shallow groove diaphragm and the steel wire rope when they jointly bear the applied pressure.

[0029] As a preferred solution of the present invention, in step 300, the specific method of adjusting the number of shallow grooves and the number of steel wire ropes according to the load distribution data is:

[0030] Establish the relationship between the bearing pressure of the shallow groove diaphragm and the wire rope and the total pressure:

[0031] ;

[0032] Among them, let:

[0033] ;

[0034] Control the number of shallow grooves and wire ropes so that:

[0035] ;

[0036] ;

[0037] in, is the ultimate bearing pressure of the shallow groove diaphragm, is the ultimate bearing pressure of the wire rope, It is the maximum total pressure of strong dynamic load.

[0038] As a preferred embodiment of the present invention, it also includes:

[0039] Step 400, after adjusting the parameters of the shallow groove diaphragm, the wire rope and the shallow groove to obtain a variety of combination data, each of the combination data is designed in sequence according to steps 100 to 300 to obtain a variety of diaphragm structures, the various diaphragm structures are tested and the actual performance of each diaphragm structure is recorded, and the actual performance of each diaphragm structure is calculated and analyzed using statistics to determine a comprehensive correction coefficient and a confidence interval, so as to correct the diaphragm structure obtained in step 300.

[0040] As a preferred solution of the present invention, in step 400, the specific method of calculating and analyzing the actual performance of each diaphragm structure using statistics to determine the comprehensive correction coefficient and the confidence interval is:

[0041] The relationship between the ultimate bearing pressure of the shallow groove diaphragm and its diameter, thickness, groove depth, quantity and material is established, and calibration tests are carried out on several commonly used specifications to determine the correction coefficient and calibrate the confidence interval of the ultimate bearing pressure of the shallow groove diaphragm.

[0042] The theoretical relationship between the ultimate bearing pressure of the wire rope and the wire rope specification is established, and its confidence interval is calibrated.

[0043] As a preferred solution of the present invention, in step 200, each of the shallow grooves is cross-distributed at a fixed rotation angle along the midpoint of the outer arc surface of the shallow groove diaphragm, and the steel wire rope is placed in the shallow groove.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention adopts a distribution calculation method to obtain load distribution data by establishing a load distribution model. After analyzing the load-bearing performance data of the shallow groove diaphragm and the load-bearing performance data of the wire rope, the shallow groove diaphragm and the wire rope are adjusted according to the load distribution data to obtain a diaphragm structure that better matches the test conditions. The design is simple and the design structure has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0047] Figure 1 A structural schematic diagram of a diaphragm design method for a rocket engine combustion chamber and nozzle strong dynamic load test device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] 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.

[0049] like Figure 1 As shown, the present invention provides a diaphragm design method for a rocket engine combustion chamber and nozzle strong dynamic load test device, comprising the following steps:

[0050] Step 100: Based on the diaphragm structure composed of the shallow groove diaphragm and the steel wire rope, a load distribution model of the shallow groove diaphragm and the steel wire rope is established by mechanical calculation, and after determining the bearing performance requirements of the diaphragm structure, the load distribution data of the shallow groove diaphragm and the steel wire rope are calculated by using the load distribution model;

[0051] Step 200: Perform mechanical analysis on the shallow groove diaphragm based on a finite element analysis method to obtain load-bearing performance data of the shallow groove diaphragm, and perform mechanical analysis on the steel wire rope based on a material mechanics analysis method to obtain load-bearing performance data of the steel wire rope;

[0052] Step 300: Based on the load-bearing performance data of the shallow groove diaphragm and the load-bearing performance data of the steel wire rope, the number of shallow grooves and the number of steel wire ropes are adjusted according to the load distribution data to obtain a diaphragm structure with required load-bearing performance.

[0053] The diaphragm design method of the present invention is mainly based on a diaphragm structure formed by a combination of a shallow groove diaphragm and a steel wire rope, and a load distribution model between the shallow groove diaphragm and the steel wire rope is established. This load distribution model can calculate the load distribution data based on the parameters of the shallow groove diaphragm and the parameters of the steel wire rope. Therefore, after mechanical analysis of the shallow groove diaphragm and the steel wire rope is performed to obtain the bearing performance data of the shallow groove diaphragm and the bearing performance data of the steel wire rope, the number of shallow grooves and the number of steel wire ropes can be obtained through the load distribution data, that is, according to the number of shallow grooves and the number of steel wire ropes, a diaphragm structure that meets the bearing performance requirements can be obtained.

[0054] In this process, the parameters of the shallow groove diaphragm and the steel wire rope are known data, so the acquisition result of the diaphragm structure can be determined, and the load distribution ratio between the shallow groove diaphragm and the steel wire rope usually does not exceed 6:4.

[0055] Among them, the determination of the bearing capacity of the shallow groove diaphragm (a shallow groove is set on a curved groove diaphragm) is based on the internal stress and strength criterion of the shallow groove diaphragm. The shape design of the shallow groove diaphragm has been deeply studied. By processing the diaphragm into a curved surface, the distribution of pressure on the diaphragm can be changed. When subjected to pressure, the shallow groove diaphragm can distribute the pressure more evenly to the entire surface, which effectively reduces the local stress concentration compared to the traditional flat diaphragm. For the calculation of the bearing capacity of the shallow groove diaphragm, it is necessary to consider the mechanical properties of the diaphragm material, the geometric shape of the shallow groove diaphragm and the parameters of the shallow groove. Using advanced mechanical analysis methods, such as finite element analysis, the stress distribution in the shallow groove diaphragm under different pressure loads can be accurately simulated. According to the strength theory of the material, such as the maximum shear stress theory or the maximum tensile stress theory, combined with the yield strength and safety factor of the shallow groove diaphragm, the maximum internal stress that the shallow groove diaphragm can withstand is determined. In this way, the bearing capacity of the shallow groove diaphragm under different working conditions is accurately determined, providing a basis for subsequent design.

[0056] Among them, the steel wire rope plays a key role in sharing the load in the diaphragm design of the present invention. The load-bearing capacity of the steel wire rope is mainly determined by its own strength characteristics. This involves factors such as the material selection, diameter, number of strands and twisting method of the steel wire rope. When selecting the material of the steel wire rope, priority is given to materials with high strength, high toughness and good fatigue resistance, such as high-strength alloy steel. According to the tensile test data of the material and the relevant strength calculation formula, the ultimate load-bearing capacity of steel wire ropes of different specifications under tensile load can be calculated. At the same time, considering the complex factors in the actual working environment, such as the bending of the steel wire rope in the shallow groove, the friction between the steel wire rope and the shallow groove diaphragm, etc., it is also necessary to make appropriate corrections to the calculation results to ensure that the steel wire rope can reliably bear the allocated load during long-term use.

[0057] Among them, under the action of pressure load, the load distribution between the shallow groove diaphragm and the steel wire rope is one of the core contents of the design of the present invention. After a lot of theoretical analysis and experimental research, it is more reasonable to control the proportion of the shallow groove diaphragm to bear the pressure load to generally not more than 60%. This load distribution ratio is determined based on the mechanical properties of the shallow groove diaphragm and the steel wire rope and their role in the entire structure. As the main pressure-bearing component, the shallow groove diaphragm bears part of the load, but in order to avoid it from rupturing due to excessive pressure, its load ratio is limited to a certain range. The remaining redundant load is borne by the steel wire rope. Through this reasonable distribution method, the advantages of the shallow groove diaphragm and the steel wire rope can be fully utilized to improve the bearing capacity and stability of the entire structure. In actual design, the specific load distribution between the two can be determined through precise mechanical calculations based on specific test requirements and the parameters of the shallow groove diaphragm and the steel wire rope.

[0058] In step 100, the load distribution model is specifically established as follows:

[0059] Establish the relationship between the bearing pressure of the shallow groove diaphragm and the total pressure:

[0060] ;

[0061] Establish the relationship between the shallow groove diaphragm pressure and the total pressure of the wire rope reverse load:

[0062] ;

[0063] The load distribution relationship between the shallow groove diaphragm and the wire rope is obtained:

[0064] ;

[0065] in, They are the bearing pressure of the shallow groove diaphragm and the bearing pressure of the wire rope. is the total pressure, is the ratio of the shallow groove diaphragm bearing pressure to the total pressure, It is the ratio of the wire rope bearing pressure to the total pressure.

[0066] Specifically, It means that the shallow groove diaphragm and the steel wire rope bear all the total pressure together, that is, the load distribution between the shallow groove diaphragm and the steel wire rope can be accurately adjusted through this formula.

[0067] Among them, in step 100, the specific method of using the load distribution model to calculate and obtain the load distribution data of the shallow groove diaphragm and the wire rope is:

[0068] Predetermine the load distribution ratio of the shallow groove diaphragm bearing pressure and the wire rope bearing pressure;

[0069] The shallow groove diaphragm is used to independently bear and apply pressure, measure the deformation of the shallow groove diaphragm, and establish the relationship between the deformation of the shallow groove diaphragm and the pressure applied by the shallow groove diaphragm:

[0070] ;

[0071] The shallow groove diaphragm and the steel wire rope are used to jointly bear the applied pressure, the deformation of the shallow groove diaphragm is measured, and the relationship between the deformation of the shallow groove diaphragm and the applied pressure is established:

[0072] ;

[0073] The load distribution relationship between the shallow groove diaphragm and the wire rope is obtained by combining:

[0074] ;

[0075] ;

[0076] in, To exert pressure, The deformation amount of the shallow groove diaphragm independently bearing the applied pressure, The deformation amount of the shallow groove diaphragm and the steel wire rope jointly bearing the pressure applied, is the relationship equation between the deformation of the shallow groove diaphragm when it independently bears the applied pressure, is the relationship equation of the deformation variable of the shallow groove diaphragm and the steel wire rope under the pressure. Based on this, the relationship between the load of the shallow groove diaphragm and the load of the steel wire rope can be calculated respectively, that is, the load distribution relationship.

[0077] Apply pressure to the shallow groove diaphragm alone and record the change data of its deformation and applied pressure, and obtain the relationship between the deformation and applied pressure of the shallow groove diaphragm according to data fitting calculation. Similarly, apply pressure to the shallow groove diaphragm and the steel wire rope and record the change data of the deformation and applied pressure of the shallow groove diaphragm, and obtain the relationship between the deformation and applied pressure of the shallow groove diaphragm with the steel wire rope according to data fitting calculation.

[0078] In step 300, the specific method of adjusting the number of shallow grooves and the number of steel wire ropes according to the load distribution data is:

[0079] Establish the relationship between the bearing pressure of the shallow groove diaphragm and the wire rope and the total pressure:

[0080] ;

[0081] Among them, let:

[0082] ;

[0083] Control the number of shallow grooves and wire ropes so that:

[0084] ;

[0085] ;

[0086] in, is the ultimate bearing pressure of the shallow groove diaphragm, is the ultimate bearing pressure of the wire rope, It is the maximum total pressure of strong dynamic load.

[0087] Specifically, before adjustment, calculation is performed to ensure that the sum of the ultimate bearing pressure of the shallow groove diaphragm and the ultimate bearing pressure of the steel wire rope is greater than the maximum total pressure of the strong dynamic load, thereby avoiding damage due to insufficient bearing capacity during the process of adjusting the number of shallow grooves and the number of steel wire ropes.

[0088] The diaphragm design method of the present invention further includes:

[0089] Step 400, after adjusting the parameters of the shallow groove diaphragm, the wire rope and the shallow groove to obtain a variety of combination data, the combination data are sequentially designed according to steps 100 to 300 to obtain a variety of diaphragm structures, the various diaphragm structures are tested and the actual performance of each diaphragm structure is recorded, and the actual performance of each diaphragm structure is calculated and analyzed using statistics to determine a comprehensive correction coefficient and a confidence interval, so as to correct the diaphragm structure obtained in step 300.

[0090] In order to further improve the accuracy and reliability of the diaphragm design, the present invention also determines the comprehensive correction coefficient and confidence interval based on the combined tests of various shallow groove diaphragms and steel wire ropes. A large number of experimental tests are carried out by changing the thickness of the shallow groove diaphragm, the shallow groove parameters, the specifications of the steel wire rope and other factors under different test conditions. During the test, the actual performance of the shallow groove diaphragm and the steel wire rope under different loads is recorded, including parameters such as bearing capacity, deformation, and membrane rupture time. These test data are analyzed and processed using statistical methods to determine the comprehensive correction coefficient. This coefficient can be used to correct the theoretical calculation results to make them more in line with the actual situation. At the same time, by calculating the confidence interval, the reliability and uncertainty range of the design method can be evaluated, providing a reference for designers in practical applications, and ensuring that the designed diaphragm structure can work stably and reliably in strong dynamic load environment tests.

[0091] In step 400, the specific method of calculating and analyzing the actual performance of each diaphragm structure using statistics to determine the comprehensive correction coefficient and the confidence interval is:

[0092] The relationship between the ultimate bearing pressure of the shallow groove diaphragm and its diameter, thickness, groove depth, quantity and material is established (refer to the flat plate strength theory), and the correction coefficient is determined by experimental calibration for several commonly used specifications, and the confidence interval of the ultimate bearing pressure of the shallow groove diaphragm is calibrated.

[0093] Establish the theoretical relationship between the ultimate bearing pressure of the wire rope and the specifications of the wire rope (quantity, material, diameter, etc.) (refer to the cable theory) and calibrate its confidence interval.

[0094] Wherein, in step 200, each shallow groove is cross-distributed at a fixed rotation angle along the midpoint of the outer arc surface of the shallow groove diaphragm, and the wire rope is placed in the shallow groove.

[0095] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A diaphragm design method for a rocket engine combustion chamber and nozzle strong dynamic load test device, characterized in that: The steps include: Step 100: Based on the diaphragm structure composed of the shallow groove diaphragm and the steel wire rope, a load distribution model of the shallow groove diaphragm and the steel wire rope is established by mechanical calculation, and after determining the bearing performance requirements of the diaphragm structure, the load distribution data of the shallow groove diaphragm and the steel wire rope are calculated by using the load distribution model; Step 200: Perform mechanical analysis on the shallow groove diaphragm based on a finite element analysis method to obtain load-bearing performance data of the shallow groove diaphragm, and perform mechanical analysis on the steel wire rope based on a material mechanics analysis method to obtain load-bearing performance data of the steel wire rope; Step 300: Based on the load-bearing performance data of the shallow groove diaphragm and the load-bearing performance data of the steel wire rope, the number of shallow grooves and the number of steel wire ropes are adjusted according to the load distribution data to obtain a diaphragm structure with required load-bearing performance; In step 100, the load distribution model is specifically established as follows: Establish the relationship between the bearing pressure of the shallow groove diaphragm and the total pressure: ； Establish the relationship between the shallow groove diaphragm pressure and the total pressure of the wire rope reverse load: ； The load distribution relationship between the shallow groove diaphragm and the wire rope is obtained: ； in, They are the bearing pressure of the shallow groove diaphragm and the bearing pressure of the wire rope. is the total pressure, is the ratio of the shallow groove diaphragm bearing pressure to the total pressure, It is the ratio of the wire rope bearing pressure to the total pressure; In step 100, the specific method of calculating and obtaining the load distribution data of the shallow groove diaphragm and the wire rope by using the load distribution model is: Predetermine the load distribution ratio of the shallow groove diaphragm bearing pressure and the wire rope bearing pressure; The shallow groove diaphragm is used to independently bear and apply pressure, measure the deformation of the shallow groove diaphragm, and establish the relationship between the deformation of the shallow groove diaphragm and the pressure applied by the shallow groove diaphragm: ； The shallow groove diaphragm and the steel wire rope are used to jointly bear the applied pressure, the deformation of the shallow groove diaphragm is measured, and the relationship between the deformation of the shallow groove diaphragm and the applied pressure is established: ； The load distribution relationship between the shallow groove diaphragm and the wire rope is obtained by combining: ； ； in, Apply pressure, The deformation amount of the shallow groove diaphragm independently bearing the applied pressure, The deformation amount of the shallow groove diaphragm and the steel wire rope jointly bearing the pressure applied, is the relationship equation between the deformation of the shallow groove diaphragm when it independently bears the applied pressure, The relationship equation between the deformation of the shallow groove diaphragm and the steel wire rope when they jointly bear the applied pressure; In step 300, the specific method of adjusting the number of shallow grooves and the number of steel wire ropes according to the load distribution data is: Establish the relationship between the bearing pressure of the shallow groove diaphragm and the wire rope and the total pressure: ； Among them, let: ； Control the number of shallow grooves and wire ropes so that: ； ； in, is the ultimate bearing pressure of the shallow groove diaphragm, is the ultimate bearing pressure of the wire rope, It is the maximum total pressure of strong dynamic load.

2. The diaphragm design method for the rocket engine combustion chamber and nozzle strong dynamic load test device according to claim 1 is characterized in that: Also includes: Step 400, after adjusting the parameters of the shallow groove diaphragm, the wire rope and the shallow groove to obtain a variety of combination data, each of the combination data is designed in sequence according to steps 100 to 300 to obtain a variety of diaphragm structures, the various diaphragm structures are tested and the actual performance of each diaphragm structure is recorded, and the actual performance of each diaphragm structure is calculated and analyzed using statistics to determine a comprehensive correction coefficient and a confidence interval, so as to correct the diaphragm structure obtained in step 300.

3. The diaphragm design method for the rocket engine combustion chamber and nozzle strong dynamic load test device according to claim 2 is characterized in that: In step 400, the specific method of calculating and analyzing the actual performance of each diaphragm structure using statistics to determine the comprehensive correction coefficient and confidence interval is: Establish the relationship between the ultimate bearing pressure of the shallow groove diaphragm and its diameter, thickness, groove depth, quantity and material, and conduct test calibration for several commonly used specifications to determine the correction coefficient and calibrate the confidence interval of the ultimate bearing pressure of the shallow groove diaphragm; The theoretical relationship between the ultimate bearing pressure of the wire rope and the wire rope specification is established, and its confidence interval is calibrated.

4. The diaphragm design method for a rocket engine combustion chamber and nozzle strong dynamic load test device according to claim 1, characterized in that: In step 200, each of the shallow grooves is cross-distributed at a fixed rotation angle along the midpoint of the outer arc surface of the shallow groove diaphragm, and the steel wire rope is placed in the shallow groove.

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