Sleigh undercarriage landing running dynamics analysis method and device
By combining finite element modeling and dynamic simulation with genetic algorithm to optimize the parameters of the sled landing gear, the shortcomings of the existing technology in the dynamic analysis of snow skating are solved, and the accurate analysis and optimization design of the sled landing gear on the snow-covered track surface are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-03-27
AI Technical Summary
Existing helicopter landing gear dynamics analysis methods cannot accurately simulate the load characteristics and key influencing parameters of snow-covered pavements, resulting in insufficient scientific design and safety, especially in the face of impact loads and dynamic response issues during snow skiing.
Finite element modeling and dynamic simulation methods were used to establish finite element models of the sled landing gear and the snow body. Simulation was performed using ABAQUS and Simulink software to obtain the dynamic load and parameter relationship of the sled landing gear on the snow-covered track. Genetic algorithm was used to optimize the parameters of the sled landing gear.
It enables dynamic performance evaluation of sled landing gear on snow-covered tracks, accurately simulates the contact and deformation between sled plates and snow-covered tracks, provides a theoretical basis for optimized design, improves the accuracy and reliability of analysis, and quantifies the influence of key parameters.
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Figure CN121744484A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of design of helicopter landing device, and particularly relates to a method and device for analyzing the landing and sliding dynamics of a ski landing gear. BACKGROUND
[0002] At present, the dynamic analysis of the landing gear of a helicopter or other aircraft is mostly focused on conventional hard pavements, and the research on the motion dynamics of soft pavements such as snow-covered pavements is less.
[0003] Snow-covered pavements have the characteristics of softness and easy deformation, and therefore the load bearing law and the cushioning characteristics of a ski landing gear are significantly different from those of conventional pavements; the snow-covered pavements have the characteristics of nonlinear mechanics and uneven distribution, which will lead to greater impact load and dynamic response problems of the landing gear during the landing and sliding process.
[0004] The existing analysis methods mainly rely on empirical formulas or simplified models, and cannot comprehensively capture the complex interaction relationship between the landing gear and the snow-covered pavement, thereby limiting the scientificity and safety of the design. Meanwhile, the side slip angle and the ski plate front angle of the ski landing gear during the snow sliding will directly affect the dynamic response. SUMMARY
[0005] The present application provides a method and device for analyzing the landing and sliding dynamics of a ski landing gear, which solves the problems that the prior art cannot accurately simulate the load characteristics of snow-covered pavements and lacks analysis of key influencing parameters, and realizes accurate analysis of the snow landing and sliding dynamics of the ski landing gear, and provides a theoretical basis for the optimized design thereof.
[0006] The present application provides a method for analyzing the landing and sliding dynamics of a ski landing gear, comprising the following steps: Step one: establishing a finite element model of the ski landing gear and the snow body; Step two: setting the initial state of the ski landing gear, the initial state including: the height H relative to the snow body and the preset tension; Step three: simulating according to the initial state, and driving the ski landing gear to slide at a preset speed after the sinking of the ski landing gear is stable; Step four: obtaining the dynamic load of the sliding of the ski landing gear; the dynamic load including: the heading load; Step five: modifying the parameters of the ski landing gear according to the dynamic load.
[0007] Optionally, the finite element model of the ski landing gear is a rigid body; The finite element model of the ski landing gear includes: a main ski plate, a tail ski plate, a main ski landing gear buffer component, a tail ski landing gear buffer component, a main tire, and a tail tire; The main tire and the corresponding main wheel shaft in the main snowshoe landing gear buffer component are provided with a hinge constraint, and the tail tire and the corresponding tail wheel shaft in the tail snowshoe landing gear buffer component are provided with a hinge constraint; The normal contact between the snowshoe landing gear and the snow body finite element model is selected to use a penalty function friction, and the tangential contact is selected to use a hard contact, The inner surface of the main tire and the tail tire bears a preset pressure.
[0008] Optionally, the parameters of the snowshoe landing gear include a snowshoe plate width b, an aspect ratio n, and a front tilt angle; the snowshoe plate front tilt angle T is an angle between a tangent of a snowshoe plate front end arc segment and a horizontal segment; the parameters of the snowshoe landing gear are modified according to the dynamic load, including: According to steps one to four, the corresponding relationship between different parameters of the snowshoe landing gear and the dynamic load is obtained; According to the corresponding relationship between different parameters of the snowshoe landing gear and the dynamic load, and the target load K, the parameters of the corrected snowshoe landing gear are obtained by using a genetic algorithm.
[0009] Optionally, the parameters of the snowshoe landing gear are modified according to the dynamic load, and further include: According to the dynamic load, a recommended value of the snowshoe landing gear ground contact speed is obtained. Optionally, the snow body finite element model is a cuboid structure with a preset length x width x height; and the snow body material uses a corrected D-P model; An air layer of 0.1 m is arranged above the snow body finite element model, and a ground model is arranged below the snow body finite element model; The snow body finite element model is set as an Euler body, and an Euler mesh EC3D8R is used as an element type.
[0010] Optionally, the corrected D-P model is provided with material cohesion, Cap centrifugal rate, initial yield surface position, and transition surface radius parameters of the snow body; The side surface of the snow body region in the snow body finite element model is provided with a non-reflective boundary; the bottom of the snow model is tightly attached to the pavement of the ground model, and the pavement of the ground model uses a rigid body.
[0011] Optionally, according to the initial state, after the snowshoe landing gear is stabilized in sinking, the snowshoe landing gear is driven to slide at a preset speed, including: According to the initial state, the sinking simulation is performed by using the Abaqus software to obtain the sinking depth of the snowshoe landing gear; After the Abaqus simulation is completed, the sinking depth is output; According to the sinking depth of the snowshoe landing gear, after the snowshoe landing gear is stabilized in sinking, the snowshoe landing gear is driven to slide at a preset speed by using the Simulink software to obtain a heading load-time curve of the snowshoe landing gear.
[0012] Optionally, the method further comprises: simulating the semi-open air layer by using the Euler method; and specifically comprising the following steps: Step one: generating an Euler component; Step two: assigning cross-section attributes; Step three: assembling the Euler component with cross-section attributes and the snow body model; Step four: defining air material properties of the Euler component, including density and viscosity; Step five: establishing a contact relationship between the Euler domain air layer and the snow body model; Step six: applying a flow velocity limit to the Euler domain air layer in the load module.
[0013] The second aspect of the application provides a snowshoe landing gear landing and sliding dynamics analysis device for performing the method of any one of the first aspect.
[0014] In summary, the beneficial effects of the application are as follows: The application aims to provide a snowshoe landing gear landing and sliding dynamics analysis method and device, specifically a snowshoe landing gear landing and sliding dynamics analysis method based on finite element modeling and dynamics simulation. This method can effectively evaluate the dynamic performance of the landing gear on snow ground, fully capture the dynamic characteristics of the snowshoe plate under different working conditions by simulating the contact, deformation and stress process between the snowshoe plate and the snow road surface, and provide reliable data support for optimization design; at the same time, it solves the problems of the prior art, such as the inability to accurately simulate the load characteristics of the snow road surface and the lack of analysis of key influencing parameters, and realizes accurate analysis of the snowshoe landing gear snow landing and sliding dynamics characteristics, while providing a theoretical basis for its optimization design.
[0015] The application aims to provide a snowshoe landing gear landing and sliding dynamics analysis method, which has the following beneficial effects: (1) High modeling accuracy: the CEL method solves the problem of large deformation of snow, and the calculation error of the landing gear under load is small, which is better than the traditional method; (2) Strong coupling, realizing landing gear-aircraft-snow coupling; (3) Quantitative analysis of the influence of ground contact speed, pitch angle and snowshoe plate front angle on the dynamics characteristics; providing a basis for engineering; (4) The application can comprehensively analyze the dynamic performance of the snowshoe landing gear during the landing and sliding process on the snow road surface, and provide scientific basis for design optimization; (5) Providing a load analysis model for the snow road surface, which can accurately represent the nonlinear force of the snow ground on the landing gear; (6) Systematically considering the influence of ground contact speed, pitch angle, snowshoe plate front angle and other parameters on the dynamics characteristics to fully support the snowshoe helicopter snow movement analysis.
[0016] (7) Provide a comprehensive analysis method based on nonlinear finite element model and dynamic simulation, which significantly improves the accuracy and reliability of the analysis; (8) Accurately simulate the characteristics of snow, and comprehensively capture the interaction between the snowshoe landing gear and the snow body; (9) The snowshoe plate core parameter design method for the wheel-snowshoe landing gear establishes the quantitative adaptation law of the snowshoe plate core parameter and the snow working condition, which can provide a basis for parameter optimization.
[0017] (10) Provide a modified D-P model to build a snow body, which increases the material cohesion of the snow body, the Cap eccentricity, the initial yield surface position, and the transition surface radius parameters. Compared with the traditional D-P model with only three parameters of friction angle, flow stress ratio, and expansion angle, the modified D-P model is more accurate and reliable in simulating the mechanical response of the snow body material. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 a Figure 1 is a structural schematic diagram of a wheel-snowshoe landing gear; Figure 1 b Figure 2 is a structural schematic diagram of a wheel-snowshoe landing gear Figure Two ; Figure 2 Figure 3 is a schematic diagram of tire size parameters; Figure 3 Figure 4 is a snow body Euler domain grid model diagram; Figure 4 Figure 5 is a simplified model of a snowshoe helicopter; Figure 5 Figure 6 is an assembly diagram of a helicopter and a snow body; Figure 6 Figure 7 is a snowshoe landing gear sliding dynamics analysis flowchart; Figure 7 Figure 8 is a schematic diagram of the front rake angle of a snowshoe plate; BRIEF DESCRIPTION OF DRAWINGS: Buffer device 1, rocker arm 2, wheel 3, spring pull rod 4, snowshoe plate 5, steel cable 6, spring plate 7, auxiliary wheel mounting arm 8, auxiliary wheel 9, first mounting joint 10, second mounting joint 11, tether ring 12, mounting shaft 13. DETAILED DESCRIPTION
[0019] As shown in Figures 1-7, the present application provides a snowshoe landing gear landing sliding dynamics analysis method and device.
[0020] As shown in Figure 1, the wheel-snowshoe landing gear provided by the present application includes the following main components: Buffer device 1, rocker arm 2, wheel 3, spring pull rod 4, ski plate 5, steel cable 6, spring plate 7, auxiliary wheel mounting arm 8, auxiliary wheel 9, first mounting joint 10, second mounting joint 11, tether ring 12, mounting shaft 13; the ski plate 5 is installed on the landing gear formed by the buffer device and the rocker arm through the mounting shaft 13 and the first mounting joint 10 and the second mounting joint 11, the spring rod 7 is tightened so that the ski plate 5 always has upward lifting pre-tightening force, so that the ski plate 5 does not insert into the snow when the helicopter is normally moving or parked on the snow surface; the auxiliary wheel 9 is installed at the rear of the ski plate 5, and the auxiliary wheel is lower than the lowest point of the ski plate 5 when the helicopter is parked, so that the auxiliary wheel 9 contacts the ground before the rear of the ski plate 5, preventing the ski plate 5 from damaging or wearing when the helicopter lands or contacts the ground on a hard surface.
[0021] The steel cable limits the rear overturning angle of the ski plate, so that the turning angle is kept within a safe range; the main function of the ski plate is to increase the landing gear ground contact area of the helicopter to reduce the pressure, etc.; the ski plate adopts a conventional geometric shape, and each has a reinforcing rib designed along the longitudinal length direction of the ski plate, which provides sufficient rigidity and strength for the ski plate; the two ribs form a longitudinal center channel inside the ski, and the wheels of the wheel ski landing gear can be moved to the specified position along the channel during installation; the ski plate has a hole in the middle, and the wheel can pass through the hole; the ski plate is designed with a certain angle of attack, because the helicopter will adopt the method of sliding take-off and landing to reduce the take-off and landing time in wartime, training or emergency state, if the ski plate has no angle of attack, the ski plate is easy to insert into the snow and be buried, causing the helicopter to tilt forward during sliding; therefore, the ski plate is designed with an angle of attack, which can smoothly slide above the snow during sliding of the helicopter, and push the snow to the both sides of the ski plate, improving the safety and applicability.
[0022] The application discloses a landing and sliding dynamics analysis method for a ski landing gear based on a full-snow road surface. 1. Establishing a finite element model (1) Model simplification: the main and tail ski landing gears are simplified respectively, the core components such as tires, ski plates, wheel shaft mounting points and equivalent buffers are retained, and structures such as bolts and small holes that do not affect calculation are removed; (2) Component modeling: the finite element models of the ski landing gear and the snow body are established; according to the geometric parameters and structural characteristics of the actual landing gear, the three-dimensional parameterized modeling technology is adopted to establish the finite element models of the ski landing gear and the key components thereof: a) Tire: first, according to tire size parameters including outer diameter R, inner diameter r, width L and tire thickness t, as shown in FIG. 1; and physical performance parameters including density p and tire pressure P, a three-dimensional model of the tire is constructed, and then a Mooney-Rivlin constitutive model is used to establish an inelastic rubber tire model.
[0023] b) Buffer: A simplified landing gear buffer model is established using the nonlinear spring-damper axial connector in ABAQUS, and the nonlinear stiffness-damping curve of the tail landing gear and the main landing gear is input through the ABAQUS axial connector (the curve comes from test data).
[0024] c) Snowboard: Determine the key stress points of the snowboard, such as the contact surface, support points, etc.
[0025] d) Establish a snow body model with a certain length x width x height, and use the modified D-P model for snow body material; set a 0.1m air layer above the snow body material.
[0026] The parameters of the snow body model include: the density, elastic modulus, shear modulus, thickness, etc. of the snow.
[0027] The modified D-P model sets the material cohesion, Cap centrifugal rate, initial yield surface position, and transition surface radius parameters of the snow body; The side of the snow area in the snow body finite element model is set to a non-reflective boundary; the bottom of the snow model is tightly attached to the runway of the ground model, and the runway of the ground model is a rigid body.
[0028] (3) Mesh the component model constructed in step (2); the snow body uses Euler body, and the element type is EC3D8R; the snowshoe landing gear uses Lagrange body, and the element type is C3D8R, which simulates the large deformation of the snow surface relative to the snowshoe landing gear through the coupled Euler-Lagrange (CEL) method.
[0029] (4) Establishment of coordinate system: Establish the snowshoe landing gear coordinate system: define the X-axis as the heading direction, pointing to the tail as the positive direction, the Z-axis as the vertical direction, pointing upward as the positive direction, and the Y-axis direction following the right-hand rule; Establish the snow body coordinate system: the X-axis is parallel to the side of the snow body and points to the end, the Z-axis is vertical and upward as positive, and the Y-axis follows the right-hand rule.
[0030] (5) Boundary conditions and load application: a) Rigid setting: The snowshoe device has extremely large stiffness compared to the snow body, so the snowshoe device is set as a rigid body to reduce the calculation cost; in the rigid body area, the relative positions of all nodes, elements, and reference points remain fixed, and the rigid body area will closely follow the reference point for rigid displacement. In addition, whether it is to apply various loads to the rigid body or to set boundary conditions, it is directly applied to the reference point, which simplifies the calculation process and improves the simulation efficiency; b) Contact setting: There is a non-negligible contact behavior between the snow body and the sled during the movement. The general contact method in the display dynamics module is used to simulate the contact behavior, and the normal contact property is selected as the penalty friction method to simulate the interaction effect of the snow body and the sled in the normal direction. The tangential contact is a hard contact to prevent the snow body and the sled from excessive embedding in the tangential direction, thereby enhancing the accuracy and reliability of the contact simulation.
[0031] c) Establishing a kinematic pair: The tire and the wheel shaft are connected by a hinge constraint, which restricts 3 translational degrees of freedom and 2 rotational degrees of freedom, and only releases the rotational degree of freedom around the X axis to match the actual situation of the tire rotating around the wheel shaft. The specific operation steps are as follows: first, create a line feature, and couple the tire and the wheel shaft parts that need to be constrained to the two ends of the line; then create a connection attribute hinge; finally, assign the attribute to the line feature to complete the constraint setting of the connection between the tire and the wheel shaft. The connection between the landing gear sled and the wheel shaft is a beam connection.
[0032] (6) Applying tire pressure: In the ABAQUS software environment, the standard method of pressure application is used to select the inner surface of the tire model to apply a certain pressure to simulate the pressure state inside the tire; 2. Landing simulation (1) Establishing a landing simulation model of the sled landing gear: assemble the finite element model of the sled landing gear with the snow body, The initial state of the main landing gear and the tail landing gear is set at a certain height H above the snow body surface to simulate the process of the landing gear falling from a certain height to the snow surface; the main and tail landing gears of the sled have a preset vertical sinking speed when they contact the snow body model surface.
[0033] (2) Use ABAQUS / Explicit module to simulate the landing of the sled landing gear, and apply a pull force of 2 / 3 times the equivalent weight of the helicopter to the landing gear to simulate the rotor lift of the helicopter during the whole landing simulation process of the sled landing gear; (3) Set the analysis step to simulate the contact, deformation and stress process of the landing gear and the snow road surface. Calculate the load curve of the sled landing gear components and obtain the sinking depth of the sled landing gear on the snow road surface; 3. Landing and sliding dynamics analysis of the sled landing gear (1) Establishing a sled landing gear snow landing and sliding dynamics model: Assemble the finite element model of the sled landing gear with the snow body, and set the initial state of the main landing gear and the tail landing gear on the snow body surface; (2) Set three analysis steps during the sled landing gear sliding simulation process: (a) Sinking step: In this step, the landing gear is gradually sunk into the snow until the depth calculated in step 2 is reached; (b) Stabilization step: After sinking is completed, the stabilization step is entered, which aims to reach a relatively stable state of interaction between the snowshoe device and the snow field, and the stabilization time lasts for 0.1s; (c) Sliding step: After the stable state is reached, the landing gear is driven to simulate sliding at a certain speed for a certain time.
[0034] (3) Calculate the dynamic load of the snowshoe landing gear sliding; 4, Data processing Convert the load read out by the snowshoe landing gear in the finite element software to the heading load calculation formula in the landing gear coordinate system as follows:
[0035]
[0036] Wherein: , are the heading load and lateral load in the landing gear coordinate system, respectively; , are the heading load and lateral load in the snow body coordinate system, respectively; is the landing gear side slip angle.
[0037] 5, Optimization of design parameters The system carries out snow landing sliding motion characteristic analysis of snowshoe type helicopter; Analyze the influence of different design parameters (ground contact speed, pitch angle, snowshoe plate front angle, etc.) on dynamic load and friction characteristics. Through parameter sensitivity analysis, determine the most influential factor and propose optimization suggestions.
[0038] Optimization of design parameters, including: Snowshoe plate sliding load analysis Adjust the model parameters (such as snowshoe plate width b) and analyze the force during sliding.
[0039] Obtain the relationship curve between width b and heading load, which is used for optimizing the width design of snowshoe plate.
[0040] Analysis of the influence of snowshoe plate aspect ratio on load Change the aspect ratio n (length to width ratio) and repeat the sliding load analysis.
[0041] Establish the relationship curve between aspect ratio n and heading load, which is used for optimizing the aspect ratio design of snowshoe plate.
[0042] Analysis of the influence of snowshoe plate front angle on load - Adjust the front rake angle a of the snowboard (i.e. the angle of the front end relative to the rear end) and analyze its effect on the side force.
[0043] - Obtain the curve of the front rake angle a versus the side force, which provides a parameterization for the design.
[0044] Objective function quantification design Express the side force F(b, n, a) as a function of the snowboard width b, the length-to-width ratio n, and the front rake angle a. Minimize the deviation M(b, n, a) between the side force coefficient f(b, n, a) and the target value K, f(b, n, a) = F(b, n, a) / G; Find the optimal combination of snowboard parameters that minimizes the objective function M(b, n, a).
[0045] Because the snowboard parameter variables interact with each other (for example, increasing the width affects the length-to-width ratio, which in turn affects the overall performance. In addition, the front rake angle and the width, length also have a synergistic effect), in order to establish an optimization model, the effect of each factor on the load and their combined effect need to be considered.
[0046] Therefore, a genetic algorithm is used to optimize the objective function. Genetic algorithm is a multi-objective optimization method that can be used to find the optimal solution under the constraint conditions; Objective function quantification design specific embodiment: optimize the width, length-to-width ratio, and front rake angle of the snowboard so that the side force coefficient approaches a fixed value K, and use a multi-objective optimization method to implement the design and implementation of the snowboard structure parameters as follows: a) Set the constraint conditions 1. Snowboard width range: 50-70 cm 2. Reasonable range of length-to-width ratio: 1:1-3:1 3. Front rake angle interval: 0°-6° 4. Data can only be integers b) Data collection and analysis (data comes from the effect of different parameters on the side force calculated in steps 5-7) Effect of snowboard width on side force | Width (cm) | Side force (N) | | 50| 230| | 55| 245| | 60| 250| | 65| 247| | 70| 240| Effect of snowboard length-to-width ratio on side force | Length-to-width ratio | Side force (N) | | 1:1| 235| | 1.5:1| 248| | 2:1| 250| | 3:1| 247| Influence of pitch angle on heading load | Forward tilt angle (°) | Heading load (N) | | 0| 225| | 1| 243| | 3| 252| | 5| 258| | 6| 250| c) Model Establishment M(b,n,a) = f(b,n,a) - K Find a set of parameters (width, aspect ratio, and forward tilt angle) that minimizes the objective function M(b,n,a).
[0047] Genetic algorithms are used in the following ways: 1) Initialize the population: Generate a set of candidate schemes containing width, aspect ratio and forward tilt angle, with each parameter randomly selected within its own constraints.
[0048] 2) Fitness evaluation: Calculate the objective function M value for each candidate solution. Since the objective is to minimize M, we need to find the combination that minimizes |fK|.
[0049] 3) Selection: Select suitable individuals to enter the next generation of the population based on their fitness values (e.g., retain the best-fit individuals).
[0050] 4) Mutation: Perform mutation operations on the selected individuals, such as adjusting the width, aspect ratio, or angle, to generate new candidate solutions.
[0051] 5) Repeat the selection and mutation until the number of iterations is reached or a sufficiently good solution is found.
[0052] Example of results Suppose that a set of optimal parameters is found using a genetic algorithm: - Width (b = 60) cm - Aspect ratio (n= 2:1) - Forward tilt angle (a = 3°) At this point, the corresponding directional drag coefficient is f(b,n,a), which is exactly equal to the target value K.
[0053] in conclusion Through the above optimization process, a set of parameters (width, aspect ratio and front rake angle) are found to minimize the deviation between the actual heading resistance coefficient and the target value. The specific optimal parameters are: - width: 60 cm - aspect ratio: 2:1 - front rake angle: 3° Based on the multi-parameter optimization method, the snowboard parameterization and quantitative design are realized through the given heading resistance coefficient.
Claims
1. A method of ski-ramp landing rollout dynamics analysis, characterized in that, The method comprises the following steps: Step 1: establishing a finite element model of the snowmobile suspension and a snow body; Step 2: setting an initial state of the snowmobile suspension, the initial state comprising a height H relative to the snow body and a preset tension; Step 3: simulating according to the initial state, and driving the snowmobile suspension to slide at a preset speed after the snowmobile suspension is stabilized in sinking; Step 4: obtaining a dynamic load of the snowmobile suspension sliding; the dynamic load comprising a heading load; Step 5: modifying parameters of the snowmobile suspension according to the dynamic load.
2. The method of ski sled landing gear runout dynamics analysis of claim 1, wherein, The finite element model of the snowmobile suspension is a rigid body; The finite element model of the snowmobile suspension comprises a main snowmobile plate, a tail snowmobile plate, a main snowmobile suspension buffer component, a tail snowmobile suspension buffer component, a main tire and a tail tire; The main tire and the corresponding main wheel shaft in the main snowmobile suspension buffer component, and the tail tire and the corresponding tail wheel shaft in the tail snowmobile suspension buffer component are provided with hinge constraints; The normal contact between the finite element model of the snowmobile suspension and the snow body is selected by using a penalty function friction, and the tangential contact is selected by using a hard contact, The inner surface of the main tire and the tail tire bears a preset pressure.
3. The method of ski sled landing gear runout dynamics analysis of claim 2, wherein, The parameters of the snowmobile suspension comprise a snowmobile plate width b, an aspect ratio n and a front tilt angle; the snowmobile plate front tilt angle T is an angle between a tangent of a front end circular segment of the snowmobile plate and a horizontal segment; the parameters of the snowmobile suspension are modified according to the dynamic load, comprising: According to steps 1 to 4, a corresponding relationship between different parameters of the snowmobile suspension and the dynamic load is obtained; According to the corresponding relationship between the different parameters of the snowmobile suspension and the dynamic load, and a target load K, a genetic algorithm is used to obtain the parameters of the snowmobile suspension after correction.
4. The method of ski sled landing gear, ground run dynamics analysis of claim 2, wherein, According to the dynamic load, the parameters of the snowmobile suspension are modified, further comprising: According to the dynamic load, a recommended value of the snowmobile suspension grounding speed is obtained.
5. The method of ski sled landing gear run dynamics analysis of claim 1, wherein, The snow body finite element model is a cuboid structure with a preset length, width and height; the snow body material uses a modified D-P model; An air layer of 0.1 m is arranged above the snow body finite element model, and a ground model is arranged below the snow body finite element model; The snow body finite element model is set as an Euler body, and the element type adopts Euler mesh EC3D8R.
6. The method of sledder landing skid dynamics analysis of claim 5, wherein, The modified D-P model is provided with the material cohesion of the snow body, the Cap eccentricity, the initial yield surface position, and the transition surface radius parameters; The side surface of the snow body region in the snow body finite element model is provided with a non-reflecting boundary; the bottom of the snow model is tightly fitted with the pavement of the ground model, and the pavement of the ground model adopts a rigid body.
7. The method of ski sled landing gear, ground run dynamics analysis of claim 1, wherein, According to the initial state, the sinking simulation is performed by using the Abaqus software, and the sinking depth of the snowmobile suspension is obtained; After the Abaqus simulation is completed, the sinking depth is outputted; According to the sinking depth of the snowmobile suspension, the Simulink software is used to drive the snowmobile suspension to slide at a preset speed after the snowmobile suspension is stabilized in sinking, and a heading load-time curve of the snowmobile suspension is obtained. The method further comprises simulating a semi-open air layer by using an Euler method; specifically comprising the following steps:
8. The method of ski sled landing gear, ground run dynamics analysis of claim 5, wherein, Step 1: generating an Euler component; Step 2: assigning a cross-sectional attribute; Step three: Assemble the Eulerian part with cross-section properties with the snow body model; Step four: Define the air material properties for the Eulerian part, including density, viscosity; Step five: Establish the contact relationship between the Eulerian air layer and the snow body model; Step six: Apply the flow velocity limit to the Eulerian air layer in the load module.
9. A sled landing gear runout dynamics analysis device, characterized by, A computer program element for performing the method according to any one of claims 1-8. A computer program element for performing the method according to any one of claims 1-8.