30 results about "Continuum mechanics" patented technology

The invention provides a modularized cord-driven continuum mechanical arm. The modularized cord-driven continuum mechanical arm comprises a plurality of modularized single bodies, a first hinge joint part and a second hinge joint part are arranged on the opposite surfaces of every two adjacent modularized single bodies respectively, the first hinge joint part of one modularized single body and the second hinge joint part of the other corresponding modularized single body form a hinge joint structure, the modularized single bodies are sequentially in hinge joint through the hinge joint structures to form mechanical arm joints, and the modularized single bodies are provided with function holes and cord passing holes arranged circumferentially sequentially. The modularized cord-driven continuum mechanical arm has the advantage that through different connecting and locking modes adopted between every two adjacent modularized single bodies, different continuum mechanical arms different in flexibility and load capacity can be obtained.

The invention discloses a method for determining the safe drilling fluid density of a coal bed based on a structural element analysis model. The method has the advantages of coal bed cleat and fracture development, big rock brittleness, low strength and obvious anisotropy and discontinuity. The borehole wall instability characteristics of the method are different from those of the common sandstone stratum. The phenomenon that the traditional borehole wall stability model based on the mechanics of continuous media is difficult to be successful for solving coal bed instability problems can be eliminated. In the method, the coal bed is composed of discrete blocks. A coal briquette which has the biggest possibility of generating spallation between surface cleats is analyzed to carry out force analysis. A structural element model of collapse pressure is built by the stressed balance condition among pressure stress, shearing strength and shaft pressure. A coefficient c is introduced to judge the stable relationship of borehole pressure and borehole wall so as to judge the range of the safe drilling fluid density.

The invention discloses a blood coagulation simulation method based on MPM, including: initializing a general data, 2, discretizing the blood into particles and grid; S3, simulating blood coagulationaccording to substance point method. The invention also discloses a blood coagulation simulation method system based on MPM. The present invention can be based on MPM frame, combined with continuum mechanics and fluid mechanics N-S equation and Lame coefficient function is designed according to the blood coagulation rate to accurately simulate the blood coagulation process.

The invention provides a fluid-solid coupling high-precision numerical simulation method based on continuous medium mechanics, and belongs to the technical field of fluid-solid coupling numerical simulation. The implementation method is as follows: based on an intrinsic non-oscillation (WENO) finite difference method, a joint algorithm coupled with a Level-Set method and a real virtual fluid method (RGFM), high-precision numerical simulation of fluid-solid coupling of continuous medium mechanics is realized. The WENO finite difference format can realize high-precision spatial discretization byselecting spatial template lattice points, so that the calculation precision is ensured, and the dissipation of shock waves is remarkably reduced; the Level-Set method can be used for effectively processing the complex topological structure change of the multi-substance interface; The RGFM method can effectively restrain the problem of non-physical oscillation generated by the interaction of shock waves and a material interface. The method can improve the prediction accuracy of the fluid-solid coupling process, and further solves the related engineering technical problems in the fluid-solid coupling field. The fluid-solid coupling field comprises the fields of high-speed penetration weapons, protection equipment, aerospace and mechanical engineering.

The invention discloses a Taylor-Courte experimental device for solid media, which relates to the field of continuum mechanics. The device comprises a cylindrical sample chamber composed of inner and outer cylindrical walls and two annular end faces; and a driving sample The drive mechanism for the relative rotation of the inner and outer cylindrical walls; the torque sensor recording system for recording the relative rotational torque of the inner and outer cylindrical walls of the sample chamber; it also includes a pressurization mechanism that provides axial pressure to the end of the sample in the cylindrical sample chamber; records the sample The pressure sensing recording system for the axial pressure on the end; the information acquisition system for recording the rheological conditions of the solid medium of the sample. The device has a simple structure and is easy to implement, and can extend the research of the rheological behavior of the liquid medium to the rheological research of the solid medium from the classical Taylor-Couette device.

The invention discloses a method for solving a nonlinear mechanics problem of a continuous medium member by applying a three-dimensional discrete entity. For the limitation of a conventional discrete unit method for calculating a continuous medium problem, discrete element models of two three-dimensional discrete entities are built by taking energy equivalence as a principle based on a mechanics theory of a continuous medium; by adding a contact spring between particle units, the Poisson ratio effect of a material is reflected; and an analytic relationship between a mesoscopic model parameter (spring stiffness) and macroscopic elastic constants (an elastic modulus and a Poisson ratio) is derived, so that a great breakthrough is achieved in simulation of the continuous medium with a large Poisson ratio in PFC software. In addition, a plastic part is added in a contact constitutive equation between the particle units. According to the method, the elastic-plastic problem of the continuous medium can be effectively subjected to simulative calculation analysis by adopting a discrete entity unit method; and the method is suitable for nonlinear mechanics problems of large deformation, damage fracture, collapse destruction and the like of a structure or the member.

The invention discloses a large-scale particle material internal stress and crushing simulation analysis method and device, which belong to the technical field of particle crushing. Based on the basic idea of ​​continuous discrete coupling, the invention combines the boundary element method and discrete element method to carry out large-scale particle crushing research , can use the boundary element method to calculate and analyze the internal stress of the particles, and combine the fracture theory of continuum mechanics, and the Hawke-Brown criterion to judge whether the particles are broken. In addition, when using boundary elements for internal stress simulation, for particle aggregates with similar shapes, such as round particles, the present invention only needs to calculate the coefficient matrix of one particle, and other similar particles obtain the coefficient matrix through coordinate conversion and coefficient scaling. The calculation efficiency is greatly improved. The invention also simulates the internal stress of the circular rockfill material and proves its effectiveness.