Single-cavity oil-gas mixed type landing gear landing column load determination method and system

Abstract

The application belongs to the technical field of single-cavity oil-gas hybrid landing gear design, and particularly relates to a single-cavity oil-gas hybrid landing gear landing plunger load determination method and system, which can conveniently and accurately calculate the single-cavity oil-gas hybrid landing gear landing plunger load, can calculate the dynamic change process of the plunger load compared with the existing method, has high accuracy, can provide effective input for plunger structure strength design, is helpful for detailed design of the plunger, and is helpful for accurate calculation of examination of the strength of the plunger and weight reduction calculation.

Description

Technical Field

[0001] The present application belongs to the technical field of single-cavity oil-gas hybrid landing gear design, and specifically relates to a method and system for determining the landing plunger load of a single-cavity oil-gas hybrid landing gear. Background Art

[0002] Single-chamber oil-gas hybrid landing gear internal buffer Figure 1 As shown, the upper portion of the buffer strut is an air chamber, while the lower portion is an oil chamber. The plunger is located in the air chamber, and an oil distributor is threadedly connected to the plunger below. The oil distributor separates the air and oil chambers. During the forward stroke, the buffer strut is compressed, and the oil in the oil chamber flows toward the air chamber through the small oil holes in the oil distributor, generating a damping force. During the reverse stroke, the buffer strut extends, and the oil flows back toward the oil chamber through the reverse oil holes. This repeated process absorbs and dissipates the aircraft's landing energy.

[0003] The internal buffer plunger load of a single-chamber oil-gas hybrid landing gear is the pressure difference between the air chamber and the oil chamber, and is the input for the strength check of the plunger structure design. To this end, currently, most methods use theoretical methods to establish a balance equation between the external load of the buffer strut and the buffer oil damping force and air spring force. According to the cross-sectional area of ​​the air chamber, oil chamber, oil hole, the initial volume and pressure of the gas, and the compression of the buffer, the pressure values ​​of the air chamber and oil chamber under each compression are solved, and then the plunger load is calculated. This method has a simple and clear theoretical basis and is easy to implement. However, it can only calculate the pressure of each chamber in the positive stroke of the buffer, and cannot accurately calculate the internal pressure of the buffer during the reverse stroke. When calculating the strength of the plunger, the difference between the pressure of the air chamber and the oil chamber in the reverse stroke is also required. It is usually assumed that the oil chamber pressure is zero during the reverse stroke, and the calculated pressure difference is too large. The plunger load obtained in this way is usually conservative and difficult to effectively guide the buffer design.

[0004] This application is proposed in view of the above-mentioned technical defects. Summary of the Invention

[0005] The purpose of the present application is to provide a method and system for determining the landing plunger load of a single-cavity oil-gas hybrid landing gear, so as to overcome or alleviate at least one of the technical deficiencies of the known technologies.

[0006] The technical solution of this application is:

[0007] On the one hand, a method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear is provided, comprising:

[0008] The steps of constructing the aircraft landing gear drop shock dynamics simulation model are as follows: constructing the aircraft landing gear drop shock dynamics simulation model;

[0009] Steps for constructing the hydraulic model of a single-chamber oil-gas hybrid landing gear buffer: construct a hydraulic model of a single-chamber oil-gas hybrid landing gear buffer;

[0010] The steps of establishing coupled simulation are as follows: establishing the aircraft landing gear drop dynamics simulation model and the single-cavity oil-gas hybrid landing gear buffer hydraulic model coupled simulation;

[0011] Coupled simulation calculation steps: A coupled simulation is performed using an aircraft landing gear drop dynamics simulation model and a single-cavity oil-air hybrid landing gear buffer hydraulic model to obtain the air cavity pressure and oil cavity pressure of the single-cavity oil-air hybrid landing gear buffer;

[0012] Steps for calculating the plunger load of a single-chamber oil-air hybrid landing gear buffer: Calculate the plunger load using the air chamber pressure and oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer.

[0013] Optionally, in the above-mentioned method for determining the landing plunger load of a single-chamber oil-gas hybrid landing gear, in the step of constructing an aircraft landing gear drop dynamics simulation model, the constructed aircraft landing gear drop dynamics simulation model includes various landing gear components, fuselage mass points, and the ground. Sliding pairs and rotating pairs are established between the various components to simulate the connection relationship between the various parts, and the tire and ground properties are set.

[0014] Optionally, in the above-mentioned method for determining the landing plunger load of a single-chamber oil-gas hybrid landing gear, in the step of constructing a hydraulic model of a single-chamber oil-gas hybrid landing gear buffer, the constructed hydraulic model of a single-chamber oil-gas hybrid landing gear buffer includes two hydraulic cylinders and one hydraulic air cylinder, wherein the volumes of the two hydraulic cylinders are connected by two throttle holes that are connected in parallel and flow in opposite directions to each other to simulate the flow of oil between the oil chamber and the air chamber, and a hydraulic cylinder and a hydraulic cylinder are connected by force to simulate the load transfer between the oil chamber and the air chamber.

[0015] Optionally, in the above-mentioned method for determining the landing plunger load of a single-chamber oil-gas hybrid landing gear, in the step of constructing a hydraulic model of a single-chamber oil-gas hybrid landing gear buffer, a heat exchange element is set between the volume of the hydraulic cylinder connected to the hydraulic cylinder force and the volume of the hydraulic cylinder to simulate heat conduction between oil and gas.

[0016] Optionally, in the above-mentioned method for determining the landing plunger load of a single-chamber oil-gas hybrid landing gear, in the coupling simulation establishment step, a coupling simulation of the aircraft landing gear landing dynamics simulation model and the single-chamber oil-gas hybrid landing gear buffer hydraulic model is established through the data exchange interface of the dynamics simulation software and the hydraulic simulation software, including control input, control output, and electromechanical coupling simulation settings, wherein:

[0017] The control input is to input the buffer compression parameter in the aircraft landing gear drop dynamics simulation model into the single-chamber oil-air hybrid landing gear buffer hydraulic model;

[0018] The control output is to output the buffer load parameters in the hydraulic model of the single-chamber oil-gas hybrid landing gear buffer to the aircraft landing gear drop dynamics simulation model;

[0019] Electromechanical coupling simulation is to simulate the hydraulic model of a single-cavity oil-gas hybrid landing gear buffer in the aircraft landing gear drop dynamics simulation model.

[0020] Optionally, in the above-mentioned method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear, in the step of calculating the plunger load of the single-chamber oil-air hybrid landing gear buffer, the plunger load is calculated as the air chamber pressure P using the air chamber pressure and the oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer. 气 -Oil chamber pressure P 油 .

[0021] On the other hand, a single-chamber oil-air hybrid landing gear landing plunger load determination system is provided, comprising:

[0022] Aircraft landing gear drop dynamics simulation model construction module, used to construct an aircraft landing gear drop dynamics simulation model;

[0023] A single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module is used to construct a single-chamber oil-gas hybrid landing gear buffer hydraulic model;

[0024] A coupled simulation module is used to establish a dynamic simulation model of the aircraft landing gear and a coupled simulation model of the hydraulic pressure of a single-cavity oil-gas hybrid landing gear buffer.

[0025] A coupled simulation calculation module is used to perform coupled simulation using an aircraft landing gear drop dynamics simulation model and a single-cavity oil-gas hybrid landing gear buffer hydraulic model to obtain the air cavity pressure and oil cavity pressure of the single-cavity oil-gas hybrid landing gear buffer;

[0026] The single-chamber oil-air hybrid landing gear buffer plunger load calculation module is used to calculate the plunger load based on the air chamber pressure and oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer.

[0027] Optionally, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, the aircraft landing gear drop dynamics simulation model constructed in the aircraft landing gear drop dynamics simulation model construction module includes the various landing gear components, body mass points, and the ground. Sliding pairs and rotating pairs are established between the various components to simulate the connection relationship between the various parts, and the tire and ground properties are set.

[0028] Optionally, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module, the single-chamber oil-gas hybrid landing gear buffer hydraulic model constructed includes two hydraulic cylinders and one hydraulic air cylinder, wherein the volumes of the two hydraulic cylinders are connected by two parallel and mutually reverse-flowing throttle holes to simulate the flow of oil between the oil chamber and the air chamber, and a hydraulic cylinder and the hydraulic cylinder are connected by force to simulate the load transfer between the oil chamber and the air chamber.

[0029] Optionally, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module, a single-chamber oil-gas hybrid landing gear buffer hydraulic model is constructed, and a heat exchange element is set between the volume of the hydraulic cylinder connected to the hydraulic cylinder force and the volume of the hydraulic cylinder to simulate heat conduction between oil and gas.

[0030] Optionally, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the coupling simulation establishment module, a coupling simulation of the aircraft landing gear landing dynamics simulation model and the single-chamber oil-gas hybrid landing gear buffer hydraulic model is established through the data exchange interface of the dynamics simulation software and the hydraulic simulation software, including control input, control output, and electromechanical coupling simulation settings, wherein,

[0031] The control input is to input the buffer compression parameter in the aircraft landing gear drop dynamics simulation model into the single-chamber oil-air hybrid landing gear buffer hydraulic model;

[0032] The control output is to output the buffer load parameters in the hydraulic model of the single-chamber oil-gas hybrid landing gear buffer to the aircraft landing gear drop dynamics simulation model;

[0033] The electromechanical coupling simulation is to call the single-cavity oil-gas hybrid landing gear buffer hydraulic model in the aircraft landing gear drop dynamics simulation model for simulation.

[0034] Optionally, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the single-chamber oil-gas hybrid landing gear buffer plunger load calculation module, the plunger load is calculated as the air cavity pressure P using the air cavity pressure and the oil cavity pressure of the single-chamber oil-gas hybrid landing gear buffer. 气 -Oil chamber pressure P 油 .

[0035] This application has at least the following beneficial technical effects:

[0036] A method and system for determining the landing plunger load of a single-chamber oil-gas hybrid landing gear are provided. The method and system have a simple and clear concept and facilitate accurate calculation of the landing plunger load of the single-chamber oil-gas hybrid landing gear. Compared with existing methods, the dynamic change process of the plunger load can be calculated with high accuracy, which can provide effective input for the strength design of the plunger structure, facilitate the detailed design of the plunger, and facilitate accurate calculation and assessment of the strength and weight reduction of the plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the internal buffer of a single-chamber oil-gas hybrid landing gear;

[0038] Figure 2 Schematic diagram of a method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear provided in an embodiment of the present application;

[0039] Figure 3 Schematic diagram of a landing gear drop dynamics simulation model for an aircraft provided in an embodiment of the present application;

[0040] Figure 4 Schematic diagram of a hydraulic model of a single-chamber oil-gas hybrid landing gear buffer provided in an embodiment of the present application;

[0041] Figure 5 Schematic diagram of setting parameters input from an aircraft landing gear drop dynamics simulation model to a hydraulic model of a single-chamber oil-air hybrid landing gear buffer, provided by an embodiment of the present application;

[0042] Figure 6 is a schematic diagram of the electromechanical coupling input and output port configuration provided by an embodiment of the present application;

[0043] Figure 7 Schematic diagram of the coupling simulation control output port setting provided in an embodiment of the present application;

[0044] Figure 8 Schematic diagram of time-domain variation curves of air chamber pressure and oil chamber pressure of a single-chamber oil-air hybrid landing gear buffer obtained through coupled simulation according to an embodiment of the present application;

[0045] Figure 9 Schematic diagram of a stroke variation curve of a single-cavity oil-gas hybrid landing gear buffer obtained through coupled simulation according to an embodiment of the present application;

[0046] Figure 10 Schematic diagram of a plunger load curve of a single-chamber oil-air hybrid landing gear buffer provided in an embodiment of the present application;

[0047] Figure 11 Schematic diagram of a single-chamber oil-gas hybrid landing gear landing plunger load determination system provided in an embodiment of the present application.

[0048] In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be understood as limiting this application. DETAILED DESCRIPTION

[0049] To make the technical solution and its advantages of this application more clear, the technical solution of this application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only some of the embodiments of this application and are only used to explain this application, not to limit this application. It should be noted that for ease of description, only the parts relevant to this application are shown in the accompanying drawings, and other relevant parts can refer to the general design.

[0050] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should have the usual meanings understood by those skilled in the art in the field to which this application belongs. The words indicating orientation used in the description of this application are only used to indicate relative directions or positional relationships. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. The word "include" used in the description of this application means that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0051] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "installation", "connection" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Technical personnel in the field can understand its specific meaning in this application according to the specific circumstances.

[0052] On the one hand, the embodiment of the present application provides a method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear, such as Figure 2 shown.

[0053] Steps for constructing an aircraft landing gear drop shock dynamics simulation model: Construct an aircraft landing gear drop shock dynamics simulation model.

[0054] The aircraft landing gear drop dynamics simulation model includes the landing gear components, the body mass points, and the ground. Sliding pairs, revolute pairs, and other kinematic pairs are established between the components to simulate the connection relationship between the parts, and the tire and ground properties are set. However, there is no need to use functions to represent the internal load of the buffer.

[0055] In a specific example, a dynamics simulation model of an aircraft landing gear drop is constructed using dynamics simulation software, such as Figure 3 shown.

[0056] Steps for constructing the hydraulic model of a single-cavity oil-gas hybrid landing gear buffer: Construct a hydraulic model of a single-cavity oil-gas hybrid landing gear buffer.

[0057] The hydraulic model of a single-chamber oil-gas hybrid landing gear buffer is equipped with two hydraulic cylinders and one hydraulic air cylinder. The volumes of the two hydraulic cylinders are connected by two parallel and mutually reverse-flowing throttle holes to simulate the flow of oil between the oil chamber and the air chamber. A hydraulic cylinder and the hydraulic cylinder are connected by force to simulate the load transfer between the oil chamber and the air chamber.

[0058] In the hydraulic model of a single-chamber oil-gas hybrid landing gear buffer, a heat exchange element can be set between the volume of the hydraulic cylinder connected to the hydraulic cylinder force and the volume of the hydraulic cylinder to simulate heat conduction between oil and gas. In addition, temperature and pressure measurement points and control points can be set at various locations in the hydraulic model of the single-chamber oil-gas hybrid landing gear buffer.

[0059] In a specific example, a hydraulic model of a single-chamber oil-gas hybrid landing gear buffer is constructed using hydraulic simulation software, such as Figure 4 shown.

[0060] Steps for establishing coupled simulation: Establish a coupled simulation of the aircraft landing gear drop dynamics simulation model and the single-cavity oil-gas hybrid landing gear buffer hydraulic model.

[0061] Through the data exchange interface of the dynamics simulation software and the hydraulic simulation software, a coupling simulation of the aircraft landing gear drop dynamics simulation model and the single-cavity oil-gas hybrid landing gear buffer hydraulic model is established, including control input, control output, and electromechanical coupling simulation settings. Among them, the control input is to input the buffer compression parameter in the aircraft landing gear drop dynamics simulation model into the single-cavity oil-gas hybrid landing gear buffer hydraulic model; the control output is to output the buffer load parameter in the single-cavity oil-gas hybrid landing gear buffer hydraulic model to the aircraft landing gear drop dynamics simulation model; the electromechanical coupling simulation is to call the single-cavity oil-gas hybrid landing gear buffer hydraulic model in the aircraft landing gear drop dynamics simulation model for simulation.

[0062] In a specific example, first set the parameters of the single-chamber oil-gas hybrid landing gear buffer hydraulic model input from the aircraft landing gear drop dynamics simulation model in the aircraft landing gear drop dynamics simulation model, and select the relative displacement between the outer cylinder and the piston rod, such as Figure 5 As shown, then set the electromechanical coupling, select the single-cavity oil-gas hybrid landing gear buffer hydraulic model, select the relative displacement set in the previous step in the input port, and the hydraulic load of the selected single-cavity oil-gas hybrid landing gear buffer hydraulic model will be automatically selected in the output parameters, as shown in Figure 6As shown, finally set the control output and select the electromechanical coupling set in the previous step, as shown Figure 7 The coupled simulation setup is complete as shown in the figure. During coupled simulation, the single-chamber oil-air hybrid landing gear buffer hydraulic model is first run, and then coupled simulation is performed in the aircraft landing gear drop dynamics simulation model interface to obtain the results.

[0063] Coupling simulation calculation steps: using the aircraft landing gear drop dynamics simulation model and the single-cavity oil-gas hybrid landing gear buffer hydraulic model, a coupling simulation is performed to obtain the air cavity pressure and oil cavity pressure of the single-cavity oil-gas hybrid landing gear buffer.

[0064] In a specific example, the coupled simulation obtains the air chamber pressure P of the single-chamber oil-air hybrid landing gear buffer. 气 , oil chamber pressure P 油 Time domain change curve, such as Figure 8 As shown in the figure, the stroke change curve of the buffer is as follows: Figure 9 As shown.

[0065] Steps for calculating the plunger load of a single-chamber oil-air hybrid landing gear buffer: Calculate the plunger load using the air chamber pressure and oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer.

[0066] The plunger load of the single-chamber oil-air hybrid landing gear buffer is the air chamber pressure P 气 -Oil chamber pressure P 油 .

[0067] In a specific example, the plunger load curve of a single-chamber oil-air hybrid landing gear buffer changes, such as Figure 10 As shown, the maximum pressure difference between the air chamber and the oil chamber during the positive stroke and the reverse stroke can be obtained respectively, which is the design load of different parts of the plunger. It can be obtained that the maximum pressure difference between the oil chamber and the air chamber in the positive stroke during the drop shock process is 5.29MPa, and the maximum pressure difference between the air chamber and the oil chamber in the reverse stroke is 1.34MPa.

[0068] The method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear disclosed in the above embodiment is simple and clear in concept, and facilitates accurate calculation of the landing plunger load of a single-chamber oil-air hybrid landing gear. Compared with existing methods, the method can calculate the dynamic change process of the plunger load with high accuracy, providing effective input for the design of the plunger structure strength, facilitating the detailed design of the plunger, and facilitating accurate calculation and assessment of the plunger's strength and weight reduction.

[0069] On the other hand, a single-chamber oil-air hybrid landing gear landing plunger load determination system is provided. Figure 11 As shown, including:

[0070] Aircraft landing gear drop dynamics simulation model construction module, used to construct an aircraft landing gear drop dynamics simulation model;

[0071] A single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module is used to construct a single-chamber oil-gas hybrid landing gear buffer hydraulic model;

[0072] A coupled simulation module is used to establish a dynamic simulation model of the aircraft landing gear and a coupled simulation model of the hydraulic pressure of a single-cavity oil-gas hybrid landing gear buffer.

[0073] A coupled simulation calculation module is used to perform coupled simulation using an aircraft landing gear drop dynamics simulation model and a single-cavity oil-gas hybrid landing gear buffer hydraulic model to obtain the air cavity pressure and oil cavity pressure of the single-cavity oil-gas hybrid landing gear buffer;

[0074] The single-chamber oil-air hybrid landing gear buffer plunger load calculation module is used to calculate the plunger load based on the air chamber pressure and oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer.

[0075] Furthermore, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, the aircraft landing gear drop dynamics simulation model construction module constructs an aircraft landing gear drop dynamics simulation model, which includes the various landing gear components, the body mass points, and the ground. Sliding pairs and rotating pairs are established between the various components to simulate the connection relationship between the various parts, and the tire and ground properties are set.

[0076] Furthermore, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module, the single-chamber oil-gas hybrid landing gear buffer hydraulic model constructed includes two hydraulic cylinders and one hydraulic air cylinder, wherein the volumes of the two hydraulic cylinders are connected by two parallel and mutually reverse-flowing throttle holes to simulate the flow of oil between the oil chamber and the air chamber, and a hydraulic cylinder and a hydraulic cylinder are connected by force to simulate the load transfer between the oil chamber and the air chamber.

[0077] Furthermore, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module, a single-chamber oil-gas hybrid landing gear buffer hydraulic model is constructed, and a heat exchange element is set between the volume of the hydraulic cylinder connected to the hydraulic cylinder force and the volume of the hydraulic cylinder to simulate heat conduction between oil and gas.

[0078] Optionally, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the coupling simulation establishment module, a coupling simulation of the aircraft landing gear landing dynamics simulation model and the single-chamber oil-gas hybrid landing gear buffer hydraulic model is established through the data exchange interface of the dynamics simulation software and the hydraulic simulation software, including control input, control output, and electromechanical coupling simulation settings, wherein,

[0079] The control input is to input the buffer compression parameter in the aircraft landing gear drop dynamics simulation model into the single-chamber oil-air hybrid landing gear buffer hydraulic model;

[0080] The control output is to output the buffer load parameters in the hydraulic model of the single-chamber oil-gas hybrid landing gear buffer to the aircraft landing gear drop dynamics simulation model;

[0081] The electromechanical coupling simulation is to call the single-cavity oil-gas hybrid landing gear buffer hydraulic model in the aircraft landing gear drop dynamics simulation model for simulation.

[0082] Furthermore, in the above-mentioned single-chamber oil-gas hybrid landing gear landing plunger load determination system, in the single-chamber oil-gas hybrid landing gear buffer plunger load calculation module, the plunger load is calculated as the air cavity pressure P according to the air cavity pressure and oil cavity pressure of the single-chamber oil-gas hybrid landing gear buffer. 气 -Oil chamber pressure P 油 .

[0083] The single-chamber oil-air hybrid landing gear landing plunger load determination system disclosed in the above-mentioned embodiment corresponds to the single-chamber oil-air hybrid landing gear landing plunger load determination method disclosed in the above-mentioned embodiment, so the description is relatively simple. For specific related details, please refer to the relevant description of the single-chamber oil-air hybrid landing gear landing plunger load determination method. Its technical effects can also be referred to the technical effects of the relevant section of the single-chamber oil-air hybrid landing gear landing plunger load determination method, and will not be repeated here.

[0084] In addition, those skilled in the art should also be able to appreciate that the various modules and units of the single-chamber oil-gas hybrid landing gear landing plunger load determination system disclosed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, this application generally describes them according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can choose to adopt different methods to implement the described functions for each specific application and its actual constraints, but such implementation should not be considered to be beyond the scope of this application.

[0085] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the scope of protection of the present application.

Claims

1. A method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear, characterized in that: include: The steps of constructing the aircraft landing gear drop shock dynamics simulation model are as follows: constructing the aircraft landing gear drop shock dynamics simulation model; The steps for constructing the hydraulic model of a single-chamber oil-gas hybrid landing gear buffer are as follows: constructing the hydraulic model of a single-chamber oil-gas hybrid landing gear buffer; The steps of establishing coupled simulation are as follows: establishing the aircraft landing gear drop dynamics simulation model and the single-cavity oil-gas hybrid landing gear buffer hydraulic model coupled simulation; Coupled simulation calculation steps: A coupled simulation is performed using an aircraft landing gear drop dynamics simulation model and a single-cavity oil-air hybrid landing gear buffer hydraulic model to obtain the air cavity pressure and oil cavity pressure of the single-cavity oil-air hybrid landing gear buffer; The steps for calculating the plunger load of a single-chamber oil-air hybrid landing gear buffer are as follows: Calculate the plunger load using the air chamber pressure and oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer; In the step of constructing the aircraft landing gear drop dynamics simulation model, the aircraft landing gear drop dynamics simulation model is constructed, including the landing gear components, the body mass points, and the ground. Sliding pairs and revolute pairs are established between the components to simulate the connection relationship between the parts, and the tire and ground properties are set; In the step of constructing a hydraulic model of a single-chamber oil-gas hybrid landing gear buffer, the constructed hydraulic model of the single-chamber oil-gas hybrid landing gear buffer includes two hydraulic cylinders and one hydraulic air cylinder, wherein the volumes of the two hydraulic cylinders are connected by two parallel throttle holes with reverse flow to each other to simulate the flow of oil between the oil chamber and the air chamber, and a force connection is set between the hydraulic cylinder and the hydraulic cylinder to simulate the load transfer between the oil chamber and the air chamber; In the coupling simulation establishment step, the coupling simulation of the aircraft landing gear drop dynamics simulation model and the single-cavity oil-gas hybrid landing gear buffer hydraulic model is established through the data exchange interface of the dynamics simulation software and the hydraulic simulation software, including control input, control output, and electromechanical coupling simulation settings. The control input is to input the buffer compression parameter in the aircraft landing gear drop dynamics simulation model into the single-chamber oil-air hybrid landing gear buffer hydraulic model; The control output is to output the buffer load parameters in the hydraulic model of the single-chamber oil-gas hybrid landing gear buffer to the aircraft landing gear drop dynamics simulation model; The electromechanical coupling simulation is to call the single-cavity oil-gas hybrid landing gear buffer hydraulic model in the aircraft landing gear drop dynamics simulation model for simulation.

2. The method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear according to claim 1, characterized in that: In the step of constructing the hydraulic model of the single-chamber oil-gas hybrid landing gear buffer, a heat exchange element is set between the volume of the hydraulic cylinder connected to the hydraulic cylinder force and the volume of the hydraulic cylinder to simulate the heat conduction between the oil and the gas.

3. The method for determining the landing plunger load of a single-chamber oil-air hybrid landing gear according to claim 2, characterized in that: In the calculation steps of the plunger load of the single-chamber oil-air hybrid landing gear buffer, the plunger load is calculated as the air chamber pressure and the oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer. p 气 -Oil chamber pressure p 油 .

4. A single-chamber oil-air hybrid landing gear landing plunger load determination system, characterized in that: include: Aircraft landing gear drop dynamics simulation model construction module, used to construct an aircraft landing gear drop dynamics simulation model; A single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module is used to construct a single-chamber oil-gas hybrid landing gear buffer hydraulic model; A coupled simulation module is used to establish a dynamic simulation model of the aircraft landing gear and a coupled simulation model of the hydraulic pressure of a single-cavity oil-gas hybrid landing gear buffer. A coupled simulation calculation module is used to perform coupled simulation using an aircraft landing gear drop dynamics simulation model and a single-cavity oil-gas hybrid landing gear buffer hydraulic model to obtain the air cavity pressure and oil cavity pressure of the single-cavity oil-gas hybrid landing gear buffer; A single-chamber oil-air hybrid landing gear buffer plunger load calculation module is used to calculate the plunger load based on the air chamber pressure and oil chamber pressure of the single-chamber oil-air hybrid landing gear buffer; The aircraft landing gear drop dynamics simulation model construction module builds an aircraft landing gear drop dynamics simulation model, including the landing gear components, body mass points, and the ground. Sliding pairs and revolute pairs are established between the components to simulate the connection relationship between the parts, and the tire and ground properties are set. In the single-chamber oil-air hybrid landing gear buffer hydraulic model construction module, the constructed single-chamber oil-air hybrid landing gear buffer hydraulic model includes two hydraulic cylinders and one hydraulic air cylinder. The volumes of the two hydraulic cylinders are connected by two parallel and mutually reverse-flowing throttle holes to simulate the flow of oil between the oil chamber and the air chamber. A force connection is set between the hydraulic cylinder and the hydraulic cylinder to simulate the load transfer between the oil chamber and the air chamber. In the coupling simulation establishment module, the coupling simulation of the aircraft landing gear drop dynamics simulation model and the single-cavity oil-gas hybrid landing gear buffer hydraulic model is established through the data exchange interface of the dynamics simulation software and the hydraulic simulation software, including control input, control output, and electromechanical coupling simulation settings. The control input is to input the buffer compression parameter in the aircraft landing gear drop dynamics simulation model into the single-chamber oil-air hybrid landing gear buffer hydraulic model; The control output is to output the buffer load parameters in the hydraulic model of the single-chamber oil-gas hybrid landing gear buffer to the aircraft landing gear drop dynamics simulation model; The electromechanical coupling simulation is to call the single-cavity oil-gas hybrid landing gear buffer hydraulic model in the aircraft landing gear drop dynamics simulation model for simulation.

5. The single-chamber oil-air hybrid landing gear landing plunger load determination system according to claim 4, characterized in that: In the single-chamber oil-gas hybrid landing gear buffer hydraulic model construction module, a single-chamber oil-gas hybrid landing gear buffer hydraulic model is constructed, and a heat exchange element is set between the volume of the hydraulic cylinder connected to the hydraulic cylinder force and the volume of the hydraulic cylinder to simulate the heat conduction between the oil and the gas.

6. The single-chamber oil-air hybrid landing gear landing plunger load determination system according to claim 5, characterized in that: In the single-chamber oil-gas hybrid landing gear buffer plunger load calculation module, the plunger load is calculated as the air cavity pressure and oil cavity pressure of the single-chamber oil-gas hybrid landing gear buffer. p 气 -Oil chamber pressure p 油 .

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