EVTOL forced landing airworthiness test method and test device

Abstract

The invention relates to the technical field of eVTOL, in particular to an eVTOL water forced landing airworthiness test method and a test device. The invention discloses an eVTOL airworthiness test method. The method comprises the following steps: making an eVTOL scaling model; preparing a test device; an eVTOL scale model water entry impact test is carried out; performing finite element simulation on the water impact test of the eVTOL scaling model; and performing finite element simulation on the water impact test of the eVTOL real machine. The eVTOL scale model is manufactured through the 3D printing technology, the problem that the interior of the model is difficult to machine through traditional wood or foam materials is solved, and the purpose of rapidly manufacturing eVTOL scale models of different sizes and shapes is achieved; by comparing the test result of the eVTOL scaling model with the finite element simulation result, the accuracy and effectiveness of the finite element analysis method in the eVTOL forced landing research are improved, and the new eVTOL initial airworthiness test technology is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of eVTOL, and in particular to an eVTOL water landing airworthiness test method and a test device. Background Art

[0002] In recent years, with the rapid development of the low-altitude economy, the airworthiness of eVTOL (electric Vertical Take-off and Landing) has attracted widespread attention. Unlike the relatively mature airworthiness process of traditional transport aviation and general aviation aircraft, there is currently no mature standard and system for the airworthiness of eVTOL. The corresponding structure, aerodynamics, flight and other aspects of airworthiness are not mature, and there is an urgent need to develop airworthiness means for eVTOL.

[0003] The cost of using real aircraft for testing is too high and unsafe. With the development of mechanical theory, fluid mechanics scaled model tests have now been developed, but the following problems still exist: 1. Scaled models are mainly made of lightweight materials such as wood or foam, which have a long production cycle and are not easy to shape. More importantly, it is difficult to process the inside of the aircraft model, making it difficult to adjust the center of gravity of the model; 2. The wires connecting the sensors will interfere. Traditional accelerometers connect the measuring end and the data acquisition instrument through wires, and the presence of wires will interfere with the imaging of high-speed cameras; 3. The clamping method of the scaled model will interfere. When releasing the model by hand, slight shaking of the hand will affect the initial entry posture of the scaled model into the water, causing test errors or even errors; 4. The data obtained only by using the scaled model is not accurate and perfect.

[0004] Therefore, it is necessary to design a more accurate and complete eVTOL water landing airworthiness test method. Summary of the invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an eVTOL water landing airworthiness test method and test device.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an eVTOL water landing airworthiness test method, comprising the following steps: Step 1, making an eVTOL scaled model: drawing a number of eVTOL scaled three-dimensional graphics of different sizes in a reduced scale according to the eVTOL real machine, adding a mass block inside the eVTOL scaled three-dimensional graphics to adjust the center of gravity position of the eVTOL scaled three-dimensional graphics; printing the several eVTOL scaled three-dimensional graphics into an eVTOL scaled model by a 3D printing method; wherein the eVTOL is an electric vertical take-off and landing aircraft; Step 2, prepare a test device: the test device includes a bracket, a pool, a mechanical arm, a Bluetooth acceleration sensor, a high-speed camera, and several eVTOL scale models; the mechanical arm is fixed to the bracket, the eVTOL scale model is clamped by the mechanical arm, the pool is filled with clean water, the pool is located below the eVTOL scale model, the Bluetooth acceleration sensor is attached to the eVTOL scale model, and the test image is captured by the high-speed camera; Step 3, performing a water impact test of an eVTOL scaled model: controlling the robotic arm to release the eVTOL scaled model, and allowing the eVTOL scaled model to fall into the water pool for a water impact process, capturing a real-time image of the eVTOL scaled model during the water impact process by using the high-speed camera, measuring the real-time acceleration of the eVTOL scaled model during the water impact process by using a Bluetooth acceleration sensor, and drawing a test acceleration-time curve; Step 4, performing finite element simulation on the water impact test of the eVTOL scaled model: air and water are added to the eVTOL scaled three-dimensional figure to obtain a first total three-dimensional figure; the first total three-dimensional figure is imported into the finite element simulation software for simulation analysis, and the simulated acceleration-time curve of the eVTOL scaled model is exported, and the finite element simulation parameters are adjusted so that the test acceleration-time curve is consistent with the simulated acceleration-time curve; Step 5, perform finite element simulation on the water impact test of the eVTOL real machine: draw an actual three-dimensional figure of the eVTOL real machine, the actual three-dimensional figure restores the external structure and internal structure of the eVTOL real machine at a ratio of 1:1, and draws air and water in the actual three-dimensional figure to obtain a second total three-dimensional figure; import the second total three-dimensional figure into the finite element simulation software for simulation analysis, and simulate according to the finite element simulation parameters used in the step 4, derive the simulated acceleration-time curve of the eVTOL real machine and the simulated pressure-time curve at the bottom position, and analyze the water landing airworthiness performance of the eVTOL real machine.

[0007] Furthermore, in the step 1, it specifically includes: Import the drawn eVTOL scaled 3D graphics into Raise3D software for slicing and adjust the gap of 3D printing; The printed eVTOL scale model is polished to remove excess burrs around the eVTOL scale model.

[0008] Furthermore, in the step 2, it specifically includes: When the Bluetooth acceleration sensor is attached to the eVTOL scale model, the Bluetooth acceleration sensor is sealed with an adhesive tape to provide waterproof treatment; Adjust the height of the robotic arm from the water surface and the gripping posture of the robotic arm; Add several fill lights and adjust their positions and directions to make the shooting environment bright.

[0009] Furthermore, in step 4, it specifically includes: Import the first overall 3D graphics into the hypermesh software to divide the eVTOL scaled model, air domain and water domain into grids; After dividing the grid, export the k file from hypermesh and import it into the ls-prepost software to add keywords; among them, the CONSTRAINED-LAGRANGE-IN-SOLID keyword sets the eVTOL scaled model to the Lagrangian algorithm, and the water and air domains to the Euler algorithm; select the grid cell sets of the key areas such as the front, middle and back of the bottom of the eVTOL scaled model through the SET-SEGMENT keyword; define the pressure changes of the above grid cell sets in DATABASE-FSI; and set the initial velocity of the eVTOL scaled model to the model entry velocity in the actual test by modifying the INITIAL-VELOCITY-GENERATION keyword; Submit the modified k file to the ls-dyna software for parallel computing and solution; Export the simulated acceleration-time curve of the eVTOL scaled model.

[0010] Furthermore, the modified k file is submitted to the ls-dyna software for parallel computing and solving, which specifically includes: Realizable with enhanced wall processing The model models the Reynolds stress; turbulent kinetic energy and turbulent diffusivity The transport equations are: ; ; Where: is the fluid density; are spatial coordinates; is the material point displacement; It’s time; is the turbulent dynamic viscosity coefficient; and are the turbulent kinetic energy generated by the mean velocity gradient and buoyancy respectively; is the drag coefficient; , and are all constants; yes The turbulent Prandtl number; and is the source term; is the dynamic viscosity; is the kinematic viscosity coefficient; The SIMPLE algorithm is used to solve the pressure-velocity coupling, the flow field gradient is constructed by the unit-based least squares method, and the finite volume method is used to discretize the control equations: the pressure term is discretized by weighted discretization of the body force, the convection terms in the momentum and turbulence equations are discretized by the third-order MUSCL format and the second-order upwind format, respectively, the diffusion term is discretized by the second-order central difference format, and the unsteady term is discretized by the second-order implicit format.

[0011] Furthermore, in step 5, the following steps are specifically included: Simulate the water entry conditions of various eVTOL real aircraft and conduct mesh convergence analysis for each condition. The changing parameters of the water entry conditions include: water entry angle, water entry speed and center of gravity position. According to the simulated acceleration-time curve of the eVTOL real aircraft under different working conditions and the simulated pressure-time curve at the bottom position, the water landing airworthiness performance of the eVTOL real aircraft is analyzed.

[0012] The present invention also provides an eVTOL forced landing airworthiness test device, which is applied to the above-mentioned eVTOL forced landing airworthiness test method, including a bracket, a pool, a robotic arm, a Bluetooth acceleration sensor, a high-speed camera, and several eVTOL scaled models; the robotic arm is fixed on the bracket, the robotic arm is used to clamp the eVTOL scaled model, the pool is filled with clean water, the pool is located below the eVTOL scaled model, the Bluetooth acceleration sensor is pasted on the eVTOL scaled model, and the high-speed camera is used to take test images.

[0013] Furthermore, it also includes a plurality of light sources, which are used to provide lighting for the high-speed camera.

[0014] Furthermore, the water pool is a transparent acrylic water pool.

[0015] It can be seen from the above description of the present invention that, compared with the prior art, the eVTOL water landing airworthiness test method of the present invention includes at least one of the following beneficial effects: 1. The present invention uses 3D printing technology to make eVTOL scaled models, which solves the difficulty of processing the inside of the model with traditional wood or foam materials, and achieves the purpose of quickly manufacturing eVTOL scaled models of different sizes and shapes; 2. The present invention introduces a Bluetooth acceleration sensor into the measurement of the water landing performance of the eVTOL scale model, reducing the influence of the wire on the optical shooting; 3. By comparing the test results of the eVTOL scaled model and the finite element simulation results, the present invention improves the accuracy and effectiveness of the finite element analysis method in the eVTOL ditching study and expands the new technology of the eVTOL initial airworthiness test; 4. The present invention performs finite element simulation of the real eVTOL machine based on reliable finite element simulation parameters obtained from the finite element simulation of the eVTOL scaled model, so that the finite element simulation data finally obtained is accurate and complete enough to accurately analyze the water landing airworthiness performance of the real eVTOL machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of steps of an eVTOL water landing airworthiness test method in a preferred embodiment of the present invention; Figure 2 This is one of the structural schematic diagrams of an eVTOL water landing airworthiness test device in a preferred embodiment of the present invention; Figure 3 This is a second structural schematic diagram of an eVTOL water landing airworthiness test device in a preferred embodiment of the present invention; Explanation of numbers in the figure: 1 bracket, 2 pool, 3 robotic arm, 4 Bluetooth acceleration sensor, 5 high-speed camera, 6 eVTOL scale model, 7 light source. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Reference Figure 1 As shown, a preferred embodiment of the present invention, an eVTOL water landing airworthiness test method, comprises the following steps: Step 1, making an eVTOL scaled model: drawing a number of eVTOL scaled three-dimensional graphics of different sizes in a reduced scale according to the eVTOL real machine, adding a mass block inside the eVTOL scaled three-dimensional graphics to adjust the center of gravity position of the eVTOL scaled three-dimensional graphics; printing the several eVTOL scaled three-dimensional graphics into an eVTOL scaled model by a 3D printing method; wherein the eVTOL is an electric vertical take-off and landing aircraft; Step 2, prepare a test device: the test device includes a bracket, a pool, a mechanical arm, a Bluetooth acceleration sensor, a high-speed camera, and several eVTOL scale models; the mechanical arm is fixed to the bracket, the eVTOL scale model is clamped by the mechanical arm, the pool is filled with clean water, the pool is located below the eVTOL scale model, the Bluetooth acceleration sensor is attached to the eVTOL scale model, and the test image is captured by the high-speed camera; Step 3, performing a water impact test of an eVTOL scaled model: controlling the robotic arm to release the eVTOL scaled model, and allowing the eVTOL scaled model to fall into the water pool for a water impact process, capturing a real-time image of the eVTOL scaled model during the water impact process by using the high-speed camera, measuring the real-time acceleration of the eVTOL scaled model during the water impact process by using a Bluetooth acceleration sensor, and drawing a test acceleration-time curve; Step 4, performing finite element simulation on the water impact test of the eVTOL scaled model: air and water are added to the eVTOL scaled three-dimensional figure to obtain a first total three-dimensional figure; the first total three-dimensional figure is imported into the finite element simulation software for simulation analysis, and the simulated acceleration-time curve of the eVTOL scaled model is exported, and the finite element simulation parameters are adjusted so that the test acceleration-time curve is consistent with the simulated acceleration-time curve; Step 5, perform finite element simulation on the water impact test of the eVTOL real machine: draw an actual three-dimensional figure of the eVTOL real machine, the actual three-dimensional figure restores the external structure and internal structure of the eVTOL real machine at a ratio of 1:1, and draws air and water in the actual three-dimensional figure to obtain a second total three-dimensional figure; import the second total three-dimensional figure into the finite element simulation software for simulation analysis, and simulate according to the finite element simulation parameters used in the step 4, derive the simulated acceleration-time curve of the eVTOL real machine and the simulated pressure-time curve at the bottom position, and analyze the water landing airworthiness performance of the eVTOL real machine.

[0021] As a preferred embodiment of the present invention, it may also have the following additional technical features: In this embodiment, step 1 specifically includes: Import the drawn eVTOL scaled 3D graphics into Raise3D software for slicing and adjust the gap of 3D printing; The printed eVTOL scale model is polished to remove the excess burrs around the eVTOL scale model to ensure that the burrs of the eVTOL scale model will not affect the water impact performance of the eVTOL scale model.

[0022] In this embodiment, step 2 specifically includes: When the Bluetooth acceleration sensor is attached to the eVTOL scale model, the Bluetooth acceleration sensor is sealed with an adhesive tape to provide waterproof treatment; Adjust the height of the robotic arm from the water surface and the gripping posture of the robotic arm; Add several fill lights and adjust their positions and directions to make the shooting environment bright.

[0023] In this embodiment, step 4 specifically includes: Import the first total 3D graphics into the hypermesh software, and divide the meshes of the eVTOL scaled model, air domain, and water domain; specifically, since the rotor of the eVTOL scaled model is at the top and is not the main structure to bear the impact, the rotor part can be removed when dividing the mesh. In step 1, the center of gravity position of the eVTOL scaled model has been adjusted by adding a mass block. The deformation of the mass block is not the focus of attention, so the mesh size of the mass block can be divided into a larger size to save computing resources.

[0024] After dividing the grid, export the k file from hypermesh and import it into the ls-prepost software to add keywords; among them, the CONSTRAINED-LAGRANGE-IN-SOLID keyword sets the eVTOL scaled model to the Lagrangian algorithm, and the water and air domains to the Euler algorithm; select the grid cell sets of the key areas such as the front, middle and back of the bottom of the eVTOL scaled model through the SET-SEGMENT keyword; define the pressure changes of the above grid cell sets in DATABASE-FSI; and set the initial velocity of the eVTOL scaled model to the model entry velocity in the actual test by modifying the INITIAL-VELOCITY-GENERATION keyword; Submit the modified k file to the ls-dyna software for parallel computing and solution; Export the simulated acceleration-time curve of the eVTOL scaled model.

[0025] In this embodiment, the modified k file is submitted to the ls-dyna software for parallel computing and solving, specifically including: Realizable with enhanced wall processing The model models the Reynolds stress; turbulent kinetic energy and turbulent diffusivity The transport equations are: ; ; Where: is the fluid density; are spatial coordinates; is the material point displacement; It’s time; is the turbulent dynamic viscosity coefficient; and are the turbulent kinetic energy generated by the mean velocity gradient and buoyancy respectively; is the drag coefficient; , and are all constants; yes The turbulent Prandtl number; and is the source term; is the dynamic viscosity; is the kinematic viscosity coefficient; The SIMPLE algorithm is used to solve the pressure-velocity coupling, the flow field gradient is constructed by the unit-based least squares method, and the finite volume method is used to discretize the control equations: the pressure term is discretized by weighted discretization of the body force, the convection terms in the momentum and turbulence equations are discretized by the third-order MUSCL format and the second-order upwind format, respectively, the diffusion term is discretized by the second-order central difference format, and the unsteady term is discretized by the second-order implicit format.

[0026] In this embodiment, step 5 specifically includes: Simulate the water entry conditions of various eVTOL real aircraft and conduct grid convergence analysis for each condition to ensure the reliability of the calculated acceleration peak. The changing parameters of the water entry condition include: water entry angle, water entry speed and center of gravity position. The water landing airworthiness of the eVTOL real aircraft is analyzed based on the simulated acceleration-time curve of the eVTOL real aircraft under different working conditions and the simulated pressure-time curve at the bottom position. Specifically, the overload of the whole machine can be obtained from the simulated acceleration-time curve of the eVTOL real aircraft. When the overload of the whole machine exceeds the design safety value of the aircraft, it means that the personnel are no longer safe under this working condition. Ground pilots should avoid this working condition when remotely controlling the eVTOL for a planned water landing. In the simulated pressure-time curve at the bottom position, if the peak pressure in a certain area is large, it means that this is a part of the structure that needs to be strengthened, and it should be given special attention during the initial airworthiness process.

[0027] Reference Figures 2 to 3 As shown, the present invention also provides an eVTOL forced landing airworthiness test device, which is applied to the above-mentioned eVTOL forced landing airworthiness test method, including a bracket 1, a pool 2, a mechanical arm 3, a Bluetooth acceleration sensor 4, a high-speed camera 5, and several eVTOL scaled models 6; the mechanical arm 3 is fixed on the bracket 1, and the mechanical arm 3 is used to clamp the eVTOL scaled model 6, the pool 2 is filled with clean water, and the pool 2 is located below the eVTOL scaled model 6, the Bluetooth acceleration sensor 4 is pasted on the eVTOL scaled model 6, and the high-speed camera 5 is used to shoot test images.

[0028] In this embodiment, a plurality of light sources 7 are further included, and the light sources 7 are used to provide lighting for the high-speed camera 5. The light sources 7 are used to provide lighting to ensure that the high-speed camera 5 can clearly capture the motion posture of the eVTOL scaled model 6.

[0029] In this embodiment, the water pool 2 is a transparent acrylic water pool. The transparent acrylic water pool is used so that the high-speed camera 5 can capture images of the eVTOL scaled model 6 above and below the water surface.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and improved concepts of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. An eVTOL water landing airworthiness test method, characterized in that: The following steps are involved: Step 1, making a scaled eVTOL model: draw a number of scaled eVTOL 3D graphics of different sizes in a scaled manner according to the real eVTOL machine, and add a mass block inside the scaled eVTOL 3D graphics to adjust the center of gravity of the scaled eVTOL 3D graphics; Printing a number of eVTOL scaled three-dimensional graphics into eVTOL scaled models by a 3D printing method; wherein the eVTOL is an electric vertical take-off and landing aircraft; Step 2, prepare a test device: the test device includes a bracket, a pool, a mechanical arm, a Bluetooth acceleration sensor, a high-speed camera, and several eVTOL scale models; the mechanical arm is fixed to the bracket, the eVTOL scale model is clamped by the mechanical arm, the pool is filled with clean water, the pool is located below the eVTOL scale model, the Bluetooth acceleration sensor is attached to the eVTOL scale model, and the test image is captured by the high-speed camera; Step 3, performing a water impact test of an eVTOL scaled model: controlling the robotic arm to release the eVTOL scaled model, and allowing the eVTOL scaled model to fall into the water pool for a water impact process, capturing a real-time image of the eVTOL scaled model during the water impact process by using the high-speed camera, measuring the real-time acceleration of the eVTOL scaled model during the water impact process by using a Bluetooth acceleration sensor, and drawing a test acceleration-time curve; Step 4, performing finite element simulation on the water impact test of the eVTOL scaled model: air and water are added to the eVTOL scaled three-dimensional figure to obtain a first total three-dimensional figure; the first total three-dimensional figure is imported into the finite element simulation software for simulation analysis, and the simulated acceleration-time curve of the eVTOL scaled model is exported, and the finite element simulation parameters are adjusted so that the test acceleration-time curve is consistent with the simulated acceleration-time curve; Step 5, perform finite element simulation on the water impact test of the eVTOL real machine: draw an actual three-dimensional figure of the eVTOL real machine, the actual three-dimensional figure restores the external structure and internal structure of the eVTOL real machine at a ratio of 1:1, and draws air and water in the actual three-dimensional figure to obtain a second total three-dimensional figure; import the second total three-dimensional figure into the finite element simulation software for simulation analysis, and simulate according to the finite element simulation parameters used in the step 4, derive the simulated acceleration-time curve of the eVTOL real machine and the simulated pressure-time curve at the bottom position, and analyze the water landing airworthiness performance of the eVTOL real machine.

2. The eVTOL water landing airworthiness test method according to claim 1, characterized in that: In the step 1, it specifically includes: Import the drawn eVTOL scaled 3D graphics into Raise3D software for slicing and adjust the gap of 3D printing; The printed eVTOL scale model is polished to remove excess burrs around the eVTOL scale model.

3. The eVTOL water landing airworthiness test method according to claim 1, characterized in that: In the step 2, it specifically includes: When the Bluetooth acceleration sensor is attached to the eVTOL scale model, the Bluetooth acceleration sensor is sealed with an adhesive tape to provide waterproof treatment; Adjust the height of the robotic arm from the water surface and the gripping posture of the robotic arm; Add several fill lights and adjust their positions and directions to make the shooting environment bright.

4. The eVTOL water landing airworthiness test method according to claim 1, characterized in that: In the step 4, it specifically includes: Import the first overall 3D graphics into the hypermesh software to divide the eVTOL scaled model, air domain and water domain into grids; After dividing the grid, export the k file from hypermesh and import it into the ls-prepost software to add keywords; among them, the CONSTRAINED-LAGRANGE-IN-SOLID keyword sets the eVTOL scaled model to the Lagrangian algorithm, and the water and air domains to the Euler algorithm; select the grid cell sets of the key areas such as the front, middle and back of the bottom of the eVTOL scaled model through the SET-SEGMENT keyword; define the pressure changes of the above grid cell sets in DATABASE-FSI; and set the initial velocity of the eVTOL scaled model to the model entry velocity in the actual test by modifying the INITIAL-VELOCITY-GENERATION keyword; Submit the modified k file to the ls-dyna software for parallel computing and solution; Export the simulated acceleration-time curve of the eVTOL scaled model.

5. The eVTOL water landing airworthiness test method according to claim 4, characterized in that: Submitting the modified k file to the ls-dyna software for parallel computing and solving specifically includes: Realizable with enhanced wall processing The model models the Reynolds stress; turbulent kinetic energy and turbulent diffusivity The transport equations are: ； ； Where: is the fluid density; are spatial coordinates; is the material point displacement; It’s time; is the turbulent dynamic viscosity coefficient; and are the turbulent kinetic energy generated by the mean velocity gradient and buoyancy respectively; is the drag coefficient; , and are all constants; yes The turbulent Prandtl number; and is the source term; is the dynamic viscosity; is the kinematic viscosity coefficient; The SIMPLE algorithm is used to solve the pressure-velocity coupling, the flow field gradient is constructed by the unit-based least squares method, and the finite volume method is used to discretize the control equations: the pressure term is discretized by weighted discretization of the body force, the convection terms in the momentum and turbulence equations are discretized by the third-order MUSCL format and the second-order upwind format, respectively, the diffusion term is discretized by the second-order central difference format, and the unsteady term is discretized by the second-order implicit format.

6. The eVTOL water landing airworthiness test method according to claim 1, characterized in that: In step 5 shown, it specifically includes: Simulate the water entry conditions of various eVTOL real aircraft and conduct mesh convergence analysis for each condition. The changing parameters of the water entry conditions include: water entry angle, water entry speed and center of gravity position. According to the simulated acceleration-time curve of the eVTOL real aircraft under different working conditions and the simulated pressure-time curve at the bottom position, the water landing airworthiness performance of the eVTOL real aircraft is analyzed.

7. An eVTOL water landing airworthiness test device, applied to the eVTOL water landing airworthiness test method according to any one of claims 1 to 6, characterized in that: It includes a bracket, a pool, a robotic arm, a Bluetooth acceleration sensor, a high-speed camera, and several eVTOL scaled models; the robotic arm is fixed on the bracket, the robotic arm is used to clamp the eVTOL scaled model, the pool is filled with clean water, the pool is located below the eVTOL scaled model, the Bluetooth acceleration sensor is pasted on the eVTOL scaled model, and the high-speed camera is used to shoot test images.

8. The eVTOL water landing airworthiness test device according to claim 7, characterized in that: Also included are several light sources, which are used to provide illumination for the high-speed camera.

9. The eVTOL water landing airworthiness test device according to claim 7, characterized in that: The water pool adopts a transparent acrylic water pool.

Images