8 results about "Contact mechanics" patented technology

The present application relates to the technical field of seepage mechanics, and particularly relates to a conical sealing surface leakage rate calculation method based on Darcy's law, comprising the following steps: a W-M function is used to simulate the random topography of the workpiece surface at a microscale, and a normalization method is used to generate surface point cloud data meeting roughness requirements; according to the surface point cloud data, a contact mechanics model is used to solve the change law between the contact state and the external load, and according to the Hertz contact theory, the contact between the rough surfaces is reconstructed as the contact between a rigid plane and a flexible rough surface; the surface is discretized into a three-dimensional grid model, the effective porosity is screened and calculated by using the connected domain discrimination method; a micro-leakage rate calculation method for the conical sealing surface in the flared pipe joint is obtained based on the effective porosity and the seepage mechanics theory algorithm; the leakage rate of the conical sealing interface is calculated, and the sealing performance of the interface is quantitatively evaluated. The present application improves the comprehensiveness and accuracy of the sealing performance evaluation.

This invention relates to a method for modeling the vibration of rolling bearings considering non-ideal Hertzian contact, belonging to the field of bearing vibration modeling technology, and includes the following steps: S1: Obtaining the basic geometric and material parameters of the rolling bearing; S2: Calculating the angular range of the load zone of the rolling bearing; S3: Calculating the geometric parameters of the contact between the rolling elements and the healthy raceway; S4: Calculating the mechanical parameters of the contact between the rolling elements and the healthy raceway; S5: Calculating the cage angular velocity parameters; S6: Calculating the angular position and angular velocity parameters of the rolling element's circumferential motion; S7: Calculating the deformation and contact force generated by all rolling elements in contact with the healthy raceway of the bearing; S8: Calculating the time-varying mechanical parameters implied by the contact between the rolling elements and the defect; S9: Dynamic modeling of the vibration excitation mechanism of the rolling bearing defect.

The application discloses a high-load roller bearing structure and material fatigue strength optimization and performance evaluation method, and relates to the technical field of bearing design and manufacturing. The method comprises the following steps: obtaining structure geometric parameters, heat treatment process parameters and chemical composition data of the bearing; calculating the hardening layer depth, surface hardness and residual stress distribution based on physical metallurgical rules; converting the microstructure features into the contact fatigue limit and stress correction factor; establishing a slice method contact mechanics model to solve the contact load distribution; taking the structure geometric parameters and heat treatment process parameters as double design variables, and taking the maximum fatigue life and the minimum heat treatment process cost as double objectives to construct a multi-objective optimization function; solving the Pareto optimal solution set by using a non-dominated sorting genetic algorithm; and evaluating the candidate schemes and generating an optimization report. The application solves the technical problem that the structure design and the heat treatment process are mutually separated and cannot be optimized in a cooperative manner in the prior art.

The present application relates to the technical field of computer aided engineering, specifically to an asphalt pavement compression resistance analysis system based on dynamic simulation, which comprises a tire load discretization module, which is used to generate a contact mechanics pre-calculation and map a ground pressure distribution cloud map according to three-dimensional scanning geometric data of a tire, extract node pressure values in the ground pressure distribution cloud map, and arrange the node pressure values according to tire pattern geometric characteristics.In the present application, the cumulative degree of internal damage of materials can be characterized from the dual dimensions of energy dissipation and shape distortion, the growth rate slope of the hysteresis loop geometric distortion index relative to the number of loading cycles can be monitored, and the slope mutation coordinates can be located, thereby achieving sensitive capture of the compression fatigue life ending inflection point.This discrimination logic based on evolution rate mutation is more accurate than simple stress threshold determination, thereby improving the reliability of asphalt pavement structure compression fatigue life prediction.

The present application relates to the technical field of rolling bearing, in particular to a rolling bearing slip state analysis method considering raceway waviness, comprising the following steps: S1: establishing a waviness model of a wavy surface with time-varying curvature radius; S2: calculating time-varying displacement excitation based on contact geometry kinematics theory; S3: calculating time-varying stiffness based on Hertz contact theory and nonlinear characteristics of contact stiffness; S4: calculating displacement relationship and acting force of each bearing component; S5: calculating bearing nonlinear dynamics differential equation; S6: analyzing the influence of wavy amplitude and wavy order on slip through a bearing slip effect calculation method of time-varying displacement and time-varying stiffness coupling based on kinematics relationship, contact mechanics characteristics and multi-body dynamics; the present application provides a wavy bearing slip dynamics model based on time-varying displacement and time-varying stiffness coupling.

A shell-imitated rubber bushing design method based on a microcosmic contact mechanical model belongs to the technical field of rubber bushings, and comprises the following steps: designing a shell-imitated rubber knuckle bearing with a steel-rubber-steel interface synergistic structure; the method comprises the following steps: performing a uniaxial tensile test on a rubber bushing material to obtain stress-strain data, processing the test data by using a fitting tool, and selecting a rubber constitutive model according to a deviation value between a fitting curve and a test curve; performing contact stress analysis and static stiffness calculation on the bionic rubber bushing; the radial contact area of the rubber bushing is calculated, and the steel-rubber interface contact area is optimized by controlling the geometric angle and radius of a steel layer; and importing a single stress-strain result obtained by finite element analysis into fatigue analysis software, and predicting the fatigue life of the rubber bushing. The shell bionic structure is applied to the heavy-duty truck chassis rubber bushing, and the technical problems that an existing heavy-duty truck rubber bushing is insufficient in rigidity and prone to failure due to fatigue under high-strength dynamic loads are solved.

The application discloses a kind of based on fractal theory's ball screw pair contact deformation improved calculation method, applied to ball screw pair bearing performance technical field, it includes: based on fractal theory, micro contact mechanics theory and the cosine function to micro asperity elastic-plastic stage research three common constructions micro asperity contact model;Based on Hertz contact theory, hornton elastic-plastic contact theory and yield characteristic Mises criterion, construct macro level ball screw pair deformation model;Optimize macro level ball screw pair deformation model in combination with effective ball number;Establish ball screw pair contact deformation overall calculation model.The application improves the accuracy of deformation amount calculation in the deformation process of ball screw pair, better guide the process and design application of relevant functional components.

The application provides a floating wind power multi-field coupling calculation method based on SPH-DEM, and belongs to the field of ocean wind power engineering. The method simulates the hydrodynamics of seawater by SPH, analyzes the contact mechanics behavior of the floating body and the anchor chain by DEM, integrates the MoorDyn module to calculate the anchor chain tension, and constructs a fluid-structure-anchor chain coupling framework. The implementation includes: establishing the SPH and DEM models, setting the boundary and initial parameters; using GPU parallel technology to perform fluid, structure and anchor chain simulation; realizing multi-physical field coupling through data interaction, and dynamically adjusting the step length to ensure the stability of the calculation combined with the CFL criterion. Compared with the CFD and FEM methods, the method has both efficiency and accuracy, is suitable for response analysis and stability evaluation of floating wind power in extreme sea conditions, and the innovation lies in breaking through the multi-scale coupling calculation problem and realizing the collaborative calculation of the structure and the mooring system in a complex sea area.