19 results about "Surface force" patented technology

The application provides a method, system, medium and device for pipeline configuration in ocean current, which comprehensively considers the stratification effect of ocean current by establishing a stratified flow field, can accurately simulate the movement of fluid around the pipeline, and thus more truly reflects the interaction between the fluid and the pipeline. Meanwhile, the boundary source term is calculated according to the relationship between the fluid velocity on the surface of the pipeline and the displacement of the pipeline surface, so that the boundary source term can accurately represent the fluid reaction force caused by the movement of the pipeline surface. The nonlinear elastic deformation model of the pipeline under the deformation condition is constructed, which can well represent the stress tensor of the pipeline. Finally, the immersed boundary method is used to take the boundary source term as the pipeline surface force, which can handle the fluid and solid interaction problem under complex boundary conditions. Through iterative updating of the flow velocity and the displacement of the pipeline surface, the convergence of the pipeline elastic mechanics equation is obtained, which provides an important reference for the design, installation and maintenance of the pipeline configuration process.

The invention provides an equivalent replacement calculation method for unbalanced load acting on the periphery of a circular roadway hole, belongs to the technical field of underground engineering, and solves the problem of displacement multi-value performance. The invention relates to an equivalent replacement calculation method for an unbalanced load acting on the periphery of a circular roadway, which comprises the following steps of: equivalently splitting a stress field of the unbalanced load acting on the periphery of the circular roadway; and respectively calculating a stress field of the central point of the hole under the action of equivalent concentrated force and a stress field of the primary surface force and Kelvin stress at the periphery of the hole under the superposed action of release load of the primary surface force and Kelvin stress at the periphery of the hole, so as to finally obtain a stress value of any point outside the circular tunnel under the action of unbalanced load. When the stress field is calculated, the displacement unitary property can be considered, the influence of the displacement multi-valued property on the calculation of the stress field of the circular roadway is thoroughly eliminated, and the calculation process is simple and convenient.

The invention relates to the technical field of structural design of hydraulic structures, in particular to a structural design method of a permeable lining segment of a high-pressure hydraulic tunnel, which comprises the following steps: calculating the seam opening amount of a segment lining before a sealing gasket fails, judging whether a seam sealing gasket fails or not, and if the seam sealing gasket does not fail, calculating the structural stress when the seam sealing gasket does not fail; otherwise, the interaction force between the lining and the surrounding rock when the segmental lining and the grouting ring are not separated is calculated according to the hydraulic power and the displacement continuous condition, then the combined bearing state of the segmental lining, the grouting ring and the surrounding rock is judged, and the structural stress before and after the lining and the grouting ring are separated is calculated according to the judgment result. The invention provides a water-permeable lining segment structure design method capable of reflecting the influence of a consolidation grouting ring on the stress of a lining structure, and the defect that a segment lining tunnel cannot bear high internal water pressure under the existing hydraulic tunnel segment lining surface force design concept is overcome.

Force measuring device on a complex surface The present description relates to a conformable force measuring device, intended to be subjected simultaneously to compressive forces and bending forces, the device comprising sensors (11, 12) arranged on either side of a substrate (100), the sensors comprising an organic piezoelectric layer (120) arranged between a first electrode (110) and a second electrode (130), the sensors (11, 12) being arranged opposite one another, so as to form a bimorph (10), the sensors being connected to electrically conductive tracks (200) intended to be connected to measuring devices, the organic piezoelectric layers (120) of the sensors (11, 12) being polarized and the sensors (11, 12) being intended to be electrically connected to the measuring devices so as to cancel either the compressive forces or the bending forces. Figure for abstract: Fig. 6

The utility model provides a sheet welding tool clamp, which relates to the technical field of laser welding and comprises a welding seat, a welding cavity is formed in the welding seat, and a welding opening for sheet welding is arranged on the end face of the welding seat; the objective table and the welding opening are oppositely arranged, and the objective table is movably installed in the welding cavity so as to bear a to-be-welded sheet; the driving assembly is connected with the objective table so as to drive the objective table to move in the direction of the welding opening. According to the design, the welding cavity is formed in the welding base, the to-be-welded sheet is contained in the welding cavity, then the to-be-welded sheet is pressed by the objective table and the welding base in cooperation with movement of the objective table when being welded, the pressing mode is full-size surface force pressing, and compared with point force pressing and line force pressing in the prior art, the problem of insufficient welding caused by poor contact is effectively solved; the clamping force is good, and the clamping limitation is small.

The embodiment of the application belongs to the technical field of flexible body mechanics analysis, and relates to a surface force solving method and a training loss function generating method and device based on a flexible body, which comprise the following steps: obtaining a current measurement displacement value of a measurement node; obtaining an input parameter by inputting a model based on the current measurement displacement value; obtaining an output parameter by a preset output solving model based on the input parameter; and obtaining a surface force by a surface force solving model based on the output parameter. The technical scheme adopted by the application can improve the efficiency of surface force solving.

The invention discloses a microcrack connection force inference method based on a graph neural network, and provides a crack contact model considering connection substances in cracks by splitting crack contact into an unconnected part and a connected part for calculation based on a parallel bonding model and a flat joint model. On the basis that a new contact model provides certain tensile strength and shear strength for a unit, a high compression-tension ratio is obtained by limiting the damage of cementation to be only controlled by contact force and torque of a connecting part, and the invention relates to the technical field of engineering rock monitoring and analysis. According to the microcrack connection force inference method based on the graph neural network, a contact model is constructed and verified through a contact surface force-displacement test and a crack-containing model loading and unloading test. And finally, testing the contact model by simulating a rock mechanical test. Results show that the contact model can effectively simulate the axial and radial strain rules of the rock at the same time.

The application discloses a hitting force measuring robot, in the application, a plurality of force measuring module structures arranged in a circumferential array are arranged along a column body curved surface, that is, the plurality of force measuring module structures are arranged on the outer surface of the column body, each force measuring module structure is provided with a force measuring sensor for force measurement, the plurality of force measuring module structures are used for measuring the hitting force, the hitting force is converted into a signal and transmitted to an external terminal, and the problem that the existing power measuring unit of the force measuring device column body cannot cover the side surface area in front of the entire column body, cannot realize the measurement of the curved surface force of the column body side surface and has a force measuring blind area is solved.

The embodiment of the application belongs to the technical field of flexible body mechanics analysis, and relates to a surface force solving method, device and equipment based on a flexible body. The surface force solving method based on the flexible body comprises the following steps: obtaining current displacement information of a measurement node of a finite element model of the flexible body, wherein the measurement node is part of nodes in the finite element model; establishing a current objective function of an optimization problem of a static force balance equation based on the current displacement information of the measurement node, wherein a preset constraint condition is added to the current objective function; and solving the optimization problem to obtain the surface force of the flexible body. The technical scheme adopted by the application can improve the efficiency of force surface force solving.

According to one aspect, the present description relates to a measurement cell (110) comprising a fixed part (112), a resonator (114) including a longitudinal axis (Δ), and a movable solid part (116) including a face (117) exposed to the particle flux. The solid part is movable relative to the fixed part along a single axis of rotation (Ox) perpendicular to a plane formed by the longitudinal axis of the first resonator and a direction normal to the exposure face. The first resonator has a first end fixed to said fixed part and a second end fixed to said movable solid part. The axis of rotation and the longitudinal axis of the resonator are separated in the direction normal to the exposure face by a predetermined non-zero distance (dp).A first distance (h) between the axis of rotation and a center of mass (Cm) of the moving massive part is strictly less than a second distance (p) between the axis of rotation and a center of pressure (Cp) of the exposure face. FIG. 2A.

The embodiment of the application belongs to the technical field of flexible body mechanics analysis, and relates to a method, device and equipment for solving surface force based on a flexible body. The method for solving surface force based on the flexible body comprises the following steps: obtaining a stiffness matrix corresponding to the flexible body; the stiffness matrix is constructed based on an extended spring-mass model and a tetrahedral mesh corresponding to the flexible body; the extended spring-mass model is a spring-mass model for describing the relationship between force and displacement by using the partial derivative of the element strain energy density; obtaining current displacement information of a measurement node in the tetrahedral mesh corresponding to the flexible body; and solving the surface force of the flexible body based on the stiffness matrix and the displacement information of the measurement node, and combining a static force balance discrete iterative equation of the flexible body. The technical scheme adopted by the application can improve the efficiency of solving the surface force based on the flexible body.

The invention provides a rigid body motion control method and system in ocean current, a medium and equipment, and the method comprises the steps: obtaining ocean current data, and constructing a layered fluid velocity model based on the ocean current data; obtaining a motion equation of a target rigid body in the ocean current; the motion equation comprises a translation equation and a rotation equation; determining discrete Lagrange points on the surface of the rigid body based on the motion equation; each Lagrange point comprises position information, surface force and a normal vector; a fluid domain corresponding to the Descartes grid discrete layering fluid velocity model with set resolution is adopted, boundary layer encryption is set, and a fluid grid is obtained; grid nodes of the fluid grid are used for storing fluid velocity and pressure; surface forces in the fluid grid and the Lagrange point are calculated through interpolation function coupling, and motion parameters of the target rigid body are output during convergence. According to the method, the grid does not need to be frequently reconstructed due to the complex shape and large displacement motion of the rigid body, and the problem of unstable numerical value caused by grid distortion in a traditional method is avoided.

The embodiment of the application belongs to the technical field of flexible body mechanics analysis, and relates to a surface force solving method and a model training method and device based on a flexible body. The surface force solving method of the flexible body comprises the following steps: obtaining a current measurement displacement value; establishing an optimization objective function based on the current measurement displacement value; obtaining an optimization initial value by combining a preset initial value with a model based on the current measurement displacement value; the optimization initial value comprises an unknown node displacement initial value and a surface force initial value of an unknown node; and the surface force is obtained by optimizing the optimization objective function based on the optimization initial value. The technical scheme adopted by the application can improve the efficiency of force surface force solving.

Force measurement device on a complex surface. This description relates to a conformable force measurement device, intended to be subjected simultaneously to compressive and bending forces, the device comprising sensors (11, 12) arranged on either side of a substrate (100), the sensors comprising an organic piezoelectric layer (120) disposed between a first electrode (110) and a second electrode (130), the sensors (11, 12) being arranged opposite each other, so as to form a bimorph (10), the sensors being connected to electrically conductive tracks (200) intended to be connected to measuring devices, the organic piezoelectric layers (120) of the sensors (11, 12) being polarized and the sensors (11, 12) being intended to be electrically connected to the measuring devices so as to cancel either the compressive or the bending forces. Figure for the abridged version: Fig. 6

This invention discloses a sensitivity analysis method and system for the force characteristics of the contact surface of a rotating ball joint based on a meta-model. The method includes the following steps: establishing a finite element model of the rotating structure and refining the model of the ball joint; constructing an index system characterizing the force characteristics of the contact surface of the rotating ball joint; designing and using the finite element model to perform numerical simulation calculations for various working conditions; summarizing the calculation results, standardizing the data, and establishing a meta-model of the force characteristics of the ball joint contact surface; obtaining the optimal meta-model through comparison and expanding the dataset; sampling the dataset using an optimized Latin hypercube sampling method and performing a global sensitivity analysis of the contact surface force characteristics. Through sensitivity analysis, the force characteristics of the contact surface of the rotating ball joint under the combined action of multiple factors can be explored, and the influence of different parameters on the force characteristics of the ball joint structure can be analyzed, thereby determining the key influencing factors of the ball joint force characteristics.

The present invention proposes a method and system for predicting the deformation of surrounding rock in underground projects based on the energy principle, which relates to the technical field of stability control of surrounding rock in underground projects. It includes obtaining basic information on underground project construction; based on the basic information on underground project construction, determining the elastic strain energy of the rock mass around the excavation area, the dissipated energy of crack expansion and development, and the elastic strain energy accumulated due to excavation; based on the elastic strain energy, the dissipated energy of crack expansion and development, and the elastic strain energy accumulated due to excavation, determining the deformation energy that drives the deformation of surrounding rock during the excavation process; based on the deformation energy that drives the deformation of surrounding rock during the excavation process and the magnitude of the surface force at different parts of the excavation area, predicting the deformation of surrounding rock at different positions in the excavation area. The present invention predicts the deformation of surrounding rock in underground projects from the perspective of energy principle, performs theoretical analysis based on the mechanical properties of rock mass, and obtains the deformation of surrounding rock in underground projects.

The utility model relates to the field of machining, in particular to a fixing clamp for a self-locking numerical control planer. The fixing clamp comprises a device base, a fixing plate is arranged above the device base, a rotating base is arranged in the middle of the upper end face of the fixing plate, a limiting clamp set is fixedly installed at the upper end of the rotating base, and a heightening piece is arranged in a groove formed in the upper end of the limiting clamp set. A pressing strip is placed at the upper end of the heightening piece, and the side end angle of the pressing strip is a round chamfer. When the clamp is used, pushing pressure is provided for the pressing strip through the notch in the inner side end of the pressing plate, so that the pressing strip applies pressure to a workpiece, and as the side end angle of the pressing strip is arranged to be the circular chamfer, the fixed clamping force is changed from surface force supply to linear force supply, the workpiece is conveniently pressed down in the workpiece clamping and fixing process, and the clamping effect is improved. And the workpiece is prevented from jumping up in the machining process to affect the machining precision.

This invention provides an analytical method for material damage problems based on the basal surface force element method, specifically including: 1) establishing a basal surface force element model for static damage problems based on the potential energy principle; 2) constructing dynamic basal surface force element equations for dynamic material damage problems; 3) solving the dynamic basal surface force element equations in step 2) using the Newmark-β method to obtain the damage evolution process of the material under dynamic loads. This invention is logically conceived, significantly improves adaptability to mesh distortion, has a simpler mathematical model, and significantly enhances the efficiency of obtaining material damage information. It can be applied to finite element damage analysis of materials and has broad application prospects.