43 results about "Mechanical equilibrium" patented technology

The utility model provides a slag pan residue crushing device which comprises a crown block, a lifting appliance and a crushing hammer, the lifting appliance is connected with the crown block through a chain, the crushing hammer is hung on the lifting appliance, and the crown block can lift the crushing hammer through the lifting appliance; after the crown block lifts the breaking hammer to a preset height, the breaking hammer and the lifting appliance can be automatically unlocked, and the breaking hammer falls into the slag tray, so that the slag in the slag tray is broken. The crushing device is based on the mechanical balance principle, the dead weight of the slag disc is converted into an unlocking power source of the crushing hammer, residues in the slag disc can be efficiently crushed without additional energy drive, the structure is simple, the cost is low, durability is achieved, manual intervention is greatly reduced, and the labor intensity of personnel is reduced.

The invention provides an unconventional oil and gas reservoir heat-fluid-solid coupling numerical simulation method and system. The method comprises the steps that a multiphase numerical model of a coupling temperature field, a seepage field and a stress field is built; the multiphase numerical model is integrated with a Cahn-Hilliard equation, a heat conduction equation, a continuity equation, a Navier-Stokes equation and a mechanical equilibrium equation; determining a model computational domain of the multiphase numerical model; performing grid discretization processing on the model calculation domain and performing grid refinement processing on the peripheries of the mass flow inlet and the pressure outlet to obtain a plurality of grid units; inputting the environmental parameters and the initial condition parameters into the multiphase numerical model, controlling the multiphase numerical model to perform discrete calculation in each grid unit, judging whether a convergence condition is met or not, and if yes, updating the physical property parameters of the multiphase fluid according to the current temperature and pressure, and outputting a numerical simulation result of the unconventional oil and gas reservoir. According to the invention, the productivity prediction deviation can be reduced.

This invention discloses a phase-field method for multi-topological domain cyclic transformation in lead titanate (PTO) ferroelectric thin films. A computational model of the PTO ferroelectric thin film is established, defining polarization, potential, displacement, and oxygen vacancy concentration as field variables. Based on Ginzburg-Landau theory, a total free energy expression for the PTO ferroelectric thin film is established, incorporating oxygen vacancy transport processes and the coupling between oxygen vacancies and the electrostatic field. Combining time-correlated Ginzburg-Landau kinetic equations, mechanical equilibrium equations, electrostatic equilibrium equations, and Nernst-Planck equations, a phase-field model of the PTO ferroelectric thin film coupled with multiple physics fields is established. A stable initial skyrmion domain structure is constructed, and a preset uniform electric field sequence is applied to simulate the cyclic transformation process between skyrmions and flux-closed domains and / or stripe domains. This method can analyze the evolution path, transformation threshold, oxygen vacancy distribution, and cyclic stability of topological domains in PTO ferroelectric thin films under the synergistic effect of an applied electric field and oxygen vacancies, providing a theoretical basis for the design of ferroelectric topological domain multi-state storage devices.

According to the method and device for in-situ survey of the water pressure borne by the underground structure, the value of the water pressure borne by the outer surface of a structure in an underground water-soil mixture on the unit area is measured according to the Newton's third law, namely the principle that acting force is equal to counter-acting force. Providing a measuring device at least comprising a survey hole, a load system and an underground water level control system; the acting force along the gravity direction is reduced in a step-by-step unloading mode, so that the measuring bottom plate tends to a static unbalance state and enters different self-stabilization balance states; along with the gradual increase of unloading, the counterforce of the soil spring in the reverse gravity direction is gradually reduced; recording the motion state of the measuring bottom plate under each stage of load, and obtaining a previous self-stabilization equilibrium state closest to the state by recording the violent floating motion state of the measuring bottom plate; the tiny soil reaction force in the self-stabilization equilibrium state is ignored, and according to a mechanical equilibrium equation, the total lower pressure value on the measurement bottom plate in the state is approximately taken as the underground water pressure value borne by the measurement bottom plate.

The application discloses a short yarn conveying automatic yarn laying system dynamic process tension control method and device, belongs to the technical field of automatic prepreg tow laying, and comprises the following steps: a mechanical equilibrium equation group considering the gravity of a floating part, friction between the floating part and a guide rail and an 'inertia force' caused by acceleration is established, real-time yarn tension is solved, and equivalent deformation of a tension spring is calculated based on the yarn tension. The torque of a hysteresis device is adjusted and the tow tension is controlled by comparing the equivalent deformation of the tension spring and the deformation of the tension spring at a balanced position. The tow tension calculated by the scheme has high precision, and the tension control precision of the short yarn conveying automatic yarn laying system dynamic process is improved.

This invention belongs to the field of tunnel construction technology and discloses a method and system for determining the support force of a shield tunneling machine (TBM) under riverbed strata with elevation differences. This method combines wedge failure theory and the limit equilibrium method, establishing a model that treats the actively failing soil in front of the TBM excavation face as a prism plus a wedge. It analyzes the mechanical equilibrium of the TBM support force and the sliding soil under the limit equilibrium state, dividing the river crossing process into five stages and calculating the support force at the excavation face of each uneven stratum under the river, thereby determining the magnitude of the ultimate support force at the excavation face of the TBM under the riverbed. This invention simplifies the wedge theory calculation model, avoiding complex formulas and cumbersome calculation steps, and accurately calculates the ultimate support force at the bottom of the riverbed, the river slope, the bottom layer without a riverbed, and the boundaries between different strata. This makes the support force calculation more consistent with actual engineering conditions, laying the foundation for subsequent theoretical analysis and technological development.

The invention relates to the technical field of roof cutting pressure relief gob-side entry retaining, in particular to a working face roof advanced pressure relief dense hole arrangement parameter design method which comprises the steps that S1, based on dense hole rock macroscopic stress analysis, a calculation relation between dense hole rock macroscopic stress and dense hole plastic zone development radius is established; step S2A, selecting a strength criterion, calculating a dense hole plastic zone development radius, and determining dense hole arrangement spacing; step S2B, based on dense inter-hole rock infinitesimal body stress analysis, establishing a dense inter-hole rock infinitesimal body mechanical equilibrium equation, and in combination with a Mohr-Coulomb strength criterion, establishing a calculation relationship between dense inter-hole rock infinitesimal body stress and an advanced working face distance; and S3, selecting according to a strength criterion, correspondingly establishing an equivalent relationship between the macroscopic stress of the rock among the dense holes and the stress of the infinitesimal body of the rock among the dense holes, forming a calculation relationship between the advance working face distance and the development radius of the plastic zone of the dense holes, and quickly determining the arrangement parameters of the dense holes.

The invention provides a geothermal reservoir fracturing-exploitation integrated numerical simulation method and system, and the method comprises the steps: firstly constructing a strong coupling model covering heat-hole-elastic mechanics, building a heat and mass transfer and mechanical equilibrium equation of a matrix and a crack, and forming a unified calculation framework, secondly, constructing a three-dimensional curved surface crack model and a triangular mesh topology by adopting an extended embedded discrete crack method, and establishing a spatial relationship between cracks and a matrix and a spatial relationship between the cracks; then, based on the geometric model, utilizing a displacement discontinuous method to calculate fracture opening and stress shadow, solving a heat-fluid-solid model through iterative coupling, and completing dynamic evolution simulation of a three-dimensional fracture group in a fracturing stage; and finally, the fracturing result serves as the initial condition of the mining stage, the injection-production cycle process is solved through a finite volume / finite element method, and seamless connection of fracturing and mining is achieved. According to the method, the three-dimensional crack propagation and heat extraction efficiency under the thermal-hole-elastic coupling effect can be accurately predicted.

The invention discloses a flow velocity measuring device and method based on the mechanics principle. The flow velocity measuring device comprises a sphere, a flexible connecting piece, a measuring part and a data processing part, wherein the sphere serves as a flow sensing element and is slightly higher than water in density. During measurement, the ball body is immersed in water flow to be measured, and the ball body reaches mechanical balance under the action of gravity, buoyancy, water flow resistance and thin wire tension. The tensile force of the flexible connecting piece is measured in real time through the measuring component, the data processing component calculates the resistance of the water flow acting on the sphere based on an established mechanical equilibrium model, and then the instantaneous flow velocity of the fluid is accurately and reversely calculated according to the square relation between the resistance and the flow velocity. The defects that a traditional flow meter is complex in structure, high in cost, poor in environmental adaptability and the like are overcome, and a flow velocity measurement solution which is simple in structure, low in cost, high in measurement precision and easy to maintain is provided.

The invention discloses a counter-force detection and jacking-free replacement method and system for an existing support. The method comprises the following steps that a height-adjustable supporting device and a deformation monitoring element are arranged on the side face of the existing support according to needs; releasing the constraint of the upper plate and the beam bottom, slowly adjusting the height of the supporting device, and monitoring the height change of the support and the adjusting power of the supporting device corresponding to the height value in real time; collecting an adjusting power value when the height of the support does not change any more and / or collecting an adjusting power value when the adjusting power and time relation is in a smooth section; when the height of the support does not change any more, the support is completely unloaded, the support is taken out, a new support is installed, and replacement of the support is completed; a vertical force value is obtained by combining the mechanical relation between the vertical counter force of the supporting device and the adjusting power, and the vertical counter force value can be known to be the counter force of the support in the initial state according to the mechanical balance relation of the supporting point; and the power of the supporting device is gradually unloaded until the power is completely unloaded, and the supporting device is taken out. According to the invention, the counter-force monitoring of the existing support can be realized, and the rapid replacement of the existing support can also be realized.

The application provides an overhead line construction tension intelligent control and sag real-time measurement method and system, and belongs to the technical field of overhead lines. The method comprises the following steps: acquiring construction terrain geometric data, meteorological environment data, environment interference data, conductor self data and current tension data; judging the current tension data based on the environment interference data; if the current tension data is valid, inputting the preset target sag, meteorological environment data, conductor self data and terrain geometric data into a tension calculation model based on a mechanical equilibrium equation to obtain target tension data; calculating the deviation value of the target tension data and the current tension data, inputting the proportional-integral-derivative control operation, obtaining the tension control amount, driving the tension machine actuator to adjust the conductor tension to obtain the adjusted tension; and calculating the current sag value based on the terrain geometric data, conductor self data, adjusted tension and meteorological environment data, and correcting the current sag value to obtain the output sag value.

The invention discloses a pure rolling rigid hinge beam mechanical standard static strain generating device which comprises a horizontal base station, ball linear guide rails are arranged on the horizontal base station, and a speed reducer, a left knife edge and a right knife edge are arranged on a micro-motion short roller guide rail between the two ball linear guide rails. The speed reducer is connected with the two knife edges through lead screws so that the speed reducer can drive the two knife edges to do axial translational motion, and the speed reducer is in transmission connection with the servo motor. The tail end of the outer side of the ball screw is sleeved with the corresponding cylindrical rolling bearing and abuts against the compression spring. The tool apron fixes one end of each force rod, the two force rods are supported through six sets of equal-height steel ball supporting columns, loading openings for clamping the calibration beam are formed in the force rods, and wedge-shaped self-locking clamping mechanisms are arranged in the loading openings to guarantee locking of the calibration beam. By means of the structure, an unconstrained ideal rigid closed plane static mechanical equilibrium system can be achieved, loading of a normal-temperature calibration beam + / -5000 mu epsilon and loading of a Kt beam + / -3000 mu epsilon can be achieved, and therefore the strain measurement precision is improved, and the strain measurement range is widened.

The application provides an unconventional oil and gas reservoir thermal fluid-solid coupling numerical simulation method and system, and the method comprises the following steps: constructing a multiphase numerical model coupling a temperature field, a seepage field and a stress field; the multiphase numerical model integrates a Cahn-Hilliard equation, a heat conduction equation, a continuity equation, a Navier-Stokes equation and a mechanical equilibrium equation; determining a model calculation domain of the multiphase numerical model; performing grid discretization processing on the model calculation domain and performing grid refinement processing on the periphery of a mass flow inlet and a pressure outlet, thereby obtaining a plurality of grid units; inputting environmental parameters and initial condition parameters into the multiphase numerical model, controlling the multiphase numerical model to perform discrete calculation in each grid unit, judging whether a convergence condition is met, if the convergence condition is met, updating physical property parameters of a multiphase fluid according to a current temperature and pressure, and outputting a numerical simulation result of the unconventional oil and gas reservoir. The application can reduce the production capacity prediction deviation.

The invention discloses a high-pressure roller mill wear prediction and service life evaluation method based on DEM-FEM coupling simulation. The method comprises the following steps: constructing a roller mill simplified model through modeling software; the method comprises the following steps: simulating crushing and contact behaviors of grinding material particles based on a discrete element method (DEM), and quantifying interaction between the particles and interaction between the particles and a roller surface by adopting a Hertz-Mindlin contact model and a Tavaries crushing model; analyzing stress and deformation characteristics of a roll shaft structure based on a finite element method (FEM), mapping particle contact force output by discrete elements into a distributed load of a finite element model by utilizing a mechanical equilibrium equation, and solving roll shaft contact stress, strain and plastic deformation distribution; and calculating the instantaneous wear loss based on an Archard wear model, converting the instantaneous wear loss under multiple working conditions into a damage index in combination with a linear cumulative damage theory, and judging the service life of the roller surface when the total damage index reaches a threshold value. According to the invention, accurate prediction of roller surface wear and scientific evaluation of service life under the action of multiple working conditions are realized.

The invention discloses a pressure-bearing under-consolidated stratum anchorage stability calculation method and system, electronic equipment and a storage medium, and the method comprises the steps: S100, constructing a water-soil pressure calculation model considering the influence of under-consolidation and confined water, and calculating the pressure of the confined water in the pressure-bearing under-consolidated stratum; the vertical and horizontal effective soil pressure at any depth z, the pore water pressure and the total pressure are calculated, and finally the water and soil pressure distribution rule is obtained; s200, based on a water and soil pressure distribution rule, accurately calculating force acting on each interface of the anchorage foundation through integral operation; s300, according to a limit equilibrium theory, establishing a mechanical equilibrium equation of the anchorage in the horizontal direction, and deducing an analytical expression of an overall anti-sliding stability coefficient containing all key parameters; and S400, on the basis of the established balance equation, constructing a calculation formula of an anti-skid stability coefficient, and applying the calculation formula to the three core scenes according to different engineering requirements. A water and soil pressure calculation model is constructed, and a mechanical balance system of all stress surfaces of the anchorage is established.

The present application relates to the technical field of wind turbine inspection robot, in particular to a kind of inspection robot negative pressure cavity adsorption force distribution method suitable for wind turbine detection, when inspection robot is operated, the inclination angle of the detection site of wind turbine, i.e. α Satisfy 10°≤ α ≤80°, the yaw angle of inspection robot β Constantly equal to 0;Based on dynamic mechanical equilibrium principle, the real-time dynamic distribution of adsorption force is carried out to the three negative pressure cavities at the bottom of inspection robot, to ensure that the robot can keep stable adsorption when walking inside the blade web of 10°-80°, and improve the safety and working efficiency of inspection robot during fan blade detection operation.

A three-dimensional layered semi-infinite foundation transient heat transfer stress coupling numerical analysis method comprises the steps that a semi-infinite domain is divided into a near-field area and a far-field area, coordinate transformation is established based on geometric similarity between similar surfaces and boundary surfaces, and a proportional boundary finite element coordinate system is formed; deriving a heat conduction and thermal stress control equation under an SBFEM coordinate system based on a variational principle and a virtual work principle, and establishing a dimensionless heat conduction matrix under a frequency domain; solving a heat conduction matrix by adopting a continuous fractional expansion method and Scherr decomposition, and realizing time domain integration through an improved fine time-history integration method (MPTSIM); under a sequential coupling framework, firstly solving a transient temperature field, and then applying the transient temperature field as a thermal load to a mechanical equilibrium equation to obtain a displacement field and a stress field; according to the method, the calculation scale and resource consumption are remarkably reduced while high precision is guaranteed, and the method is suitable for efficient analysis of the transient thermal-mechanical coupling problem in the three-dimensional layered semi-infinite foundation.

The application relates to a natural gas hydrate decomposition process full-coupling numerical simulation method and device, wherein the method comprises the following steps: establishing a mass conservation model, an energy conservation model, a mechanical equilibrium model and a hydrate decomposition model of soil particles, hydrates, gas and water of natural gas hydrates in a decomposition process, constructing a heat-flow-force-chemistry full-coupling model of natural gas hydrates in the decomposition process, taking gas pressure, water pressure, temperature and displacement in different directions as basic unknown quantities of the model, and establishing a finite element weak integral form of the heat-flow-force-chemistry full-coupling model; performing numerical solution on the finite element weak integral form, and assembling a DEHydrate simulator based on a solution result to simulate an evolution trend of reservoir mechanical behavior of natural gas hydrates in the decomposition process. Therefore, the problems that existing hydrate decomposition simulators cannot realize complete coupling among seepage, hydrate phase change, heat transfer and geomechanics are solved.

The invention relates to the technical field of mechanical engineering, and discloses a tooth surface contact stress calculation method for a multistage parallel shaft gear transmission system. Compared with the prior art that the gear surface contact stress is calculated only according to the gear structure, the influence of the system structure flexibility on the gear meshing characteristic is neglected, and consequently the calculation of the gear surface contact stress is inaccurate, the technical scheme is combined with the structural characteristics of the system, and the multi-stage parallel shaft gear transmission system is dispersed into a plurality of basic units; a stiffness matrix of a system is established by calculating a stiffness matrix of each basic unit, then a statics equilibrium equation set of the system is established according to working condition information and a load vector, the meshing misalignment amount of a gear pair is obtained by solving the statics equilibrium equation set of the system, and the tooth surface contact stress is calculated according to the meshing misalignment amount. According to the technical scheme, the influence of a flexible structure on the system is comprehensively considered, and more accurate calculation of the tooth surface contact stress of the multistage parallel shaft gear transmission system, which is more suitable for practical application, is realized.

This invention relates to the fields of vibration control and nonlinear mechanics, and provides a programmable method for generating two-dimensional nonlinear forces. The method includes: responding to a two-dimensional nonlinear force generation request; acquiring the structure and structural parameters of a mechanical realization device; determining the trajectory of the center point of a rolling component during motion based on mechanical equilibrium relationships, and acquiring the geometric expression of the rolling component's trajectory surface; and, based on the geometric dimensions of the rolling component, performing equidistant mapping along the normal direction on the rolling component's trajectory surface, causing the rolling component to adhere to and roll along a three-dimensional guide surface, thereby generating a nonlinear force corresponding to a target nonlinear force function. This method not only generates nonlinear forces of arbitrary continuous form based on a preset target force function and supports personalized customization of nonlinear stiffness characteristics, but also generates nonlinear forces that meet target requirements in two mutually orthogonal motion directions.

This invention discloses a method for evaluating oil saturation based on the self-sealing capacity of tight reservoirs, relating to the field of petroleum exploration and development technology. First, this invention fits an acoustic transit time-depth trend line based on conventional logging data, and uses the Eaton method to calculate the total overpressure and separate hydrocarbon generation pressurization. Second, through high-pressure mercury injection experiments and conversion of charging characteristics, the relationship between pore throat radius and oil saturation is determined. Then, based on the capillary pressure formula and hydrocarbon generation pressurization intensity, the critical charging pore throat radius is determined. Based on mechanical equilibrium relationships, the upper limit of the self-sealing pore throat radius is determined. Finally, the effective reservoir pore throat range is defined, and oil saturation is calculated. This method overcomes the technical shortcomings of traditional methods that neglect the dynamic coupling relationship between hydrocarbon generation pressurization, pore throat charging, and self-sealing capacity during tight oil accumulation, resulting in large evaluation errors.

This invention relates to the field of optical interferometry technology and discloses a multi-scale anisotropic dynamic elastoplastic mesh phase unpacking method and apparatus. The method involves obtaining the gradient field of the encapsulated phase matrix as the initial prestress; establishing a discrete node mesh corresponding to the image; initializing the anisotropic stiffness coefficient tensor based on residual point detection; constructing and solving a multi-scale mechanical equilibrium equation based on the minimum potential energy principle; calculating the difference between the current unpacked phase gradient and the prestress to obtain the local lattice strain field; dynamically updating the stiffness coefficients according to the strain magnitude based on a nonlinear plastic constitutive relation to simulate the plastic softening and fracture behavior in the shear region; iterating until the system potential energy converges, and outputting the target unpacked phase matrix. This invention accelerates convergence through multi-scale solving, suppresses noise and preserves phase discontinuity characteristics by utilizing anisotropic elastoplastic mechanisms, solves the problem of traditional algorithms easily producing stringing or excessive smoothing, and improves the accuracy of phase unpacking.

The invention discloses a method for calculating an optimal ultra-deep coefficient in cut blasting based on an ultra-deep blasting theory in the technical field of ultra-deep cut blasting. The method comprises the following steps: firstly, analyzing a mechanical equilibrium relationship in a movement process of rock fragments in a blasting groove cavity; according to the calculation method, the hole digging depth and the ultra-deep coefficient required by the blast hole can be quantified, the dynamic resistance in the groove cavity can be calculated after the rock mass to be blasted is broken, and the optimal ultra-deep value under different hole depths can be verified through a contrast test, so that the hole digging depth and the ultra-deep coefficient of the blast hole can be calculated. Theoretically calculating an ultra-deep coefficient setting reference under the limit equilibrium state of crushing and throwing, due to the fact that when the method is used for determining slotting blasting parameters and technologies, interference of human experience value taking on blasting parameter and blasting technology selection is reduced, the method can quantitatively analyze the blasting hazard effect, and the blasting quality is improved. The effect of a blasting scheme is measured by using the broken lumpiness of rocks after blasting and circulating footage, and for blasting in various complex environments, the depth of a blast hole is accurately calculated by calculating an ultra-deep coefficient, so that a proper blasting design scheme is more accurately selected.

We provide a foldable cabinet equipped with vacuum compression bags. [Solution] The folding cabinet includes a cabinet body and a vacuum compression bag, the vacuum compression bag having a bag opening. The cabinet body includes an interlayer mechanism, a folding mechanism 3, and a support mechanism. The interlayer mechanism includes a first interlayer support member and a second interlayer support member, the first interlayer support member includes a first mounting frame and a lid plate 12, and the bag opening is connected to the first mounting frame. The folding mechanism is supported between the first interlayer support member and the second interlayer support member, and the folding mechanism includes an unfolded state, a stored state, and a plurality of folded states. The support mechanism is suitable for a driving force that continuously provides a tendency for the folding mechanism to transition to the unfolded state, and in its natural state the folding mechanism maintains the unfolded state. When the vacuum compression bag is vacuumed, the folding mechanism can transition from the unfolded state to any folded state or stored state until mechanical equilibrium is achieved.

The invention relates to a coal mine numerical simulation and monitoring data fusion method based on the shortest distance, and the method comprises the steps: constructing a global target functional with the minimum deviation between simulation data and actual measurement data as a target according to the mechanical characteristics of a rock mass material and with rock mass mechanical balance as a constraint; by solving a global target functional, an optimal solution meeting the minimum data deviation and rock mass mechanical equilibrium is obtained through multi-field game equilibrium; if the optimal solution does not meet the preset convergence condition, data driving is conducted again according to the optimal solution, the global target functional is solved till the obtained optimal solution meets the preset convergence condition, and simulation data fitting the actual coal mine rock is output. According to the method, the shortest distance is defined, and the data driving and game equilibrium algorithms are combined, so that the optimal solution meeting mechanical equilibrium and minimum deviation at the same time is found, the simulation result strictly follows the rock mass mechanical constitutive and is close to the actually measured data as much as possible, and the accuracy of the coal mine rock mass simulation data is improved.

The application discloses a structure high-cycle fatigue increment analysis method based on internal force amplitude correction, and belongs to the technical field of metal structure fatigue analysis. First, key fatigue details of a metal structure are determined, and S-N curves are determined according to the closest fatigue detail classification in a hot spot stress method suggestion. Correction factors are determined according to actual nodes of the key fatigue details, and a corrected F-N curve is obtained, and a pre-damage index is calculated. A non-steady-state high-cycle fatigue pre-damage evolution criterion based on a time domain increment is used to filter a non-steady-state loading original curve, and an input non-steady-state fatigue loading system is obtained. Finally, a metal structure high-cycle fatigue increment analysis model is established, kinematics relationship and mechanical equilibrium relationship between a rod element and nodes at two ends of the rod element are constructed, an elastic stiffness matrix is established, a high-cycle fatigue loading test is simulated, a non-steady-state high-cycle fatigue pre-damage evolution process of the metal structure is predicted in real time, and the high-cycle fatigue life of the metal structure such as a large-span steel bridge can be more accurately predicted.

This invention discloses a method, computer equipment, and storage medium for calculating the critical thickness of the rock mass for preventing tunnel bursts when crossing inclined discontinuous geological bodies under construction disturbance. It acquires parameters of the tunnel, rock mass, and support structure, as well as information on the discontinuous geological bodies the tunnel will cross; quantifies the impact of stress release on the mechanical equilibrium of the rock mass for preventing bursts; and determines the stress release rate of the surrounding rock relative to the excavation distance. x The relationship; by constructing a numerical model, the distance from the tunnel face to the target section is obtained. S t The stress relief coefficient curve is used as the independent variable, and the fitting parameter values ​​are determined to obtain different excavation distances. x The stress release coefficient is determined; a thin-layer unit model of the discontinuous geological body is constructed, and the expressions for the vertical and horizontal stresses of the surrounding rock of the discontinuous geological body are obtained; the critical thickness of the anti-outburst rock block is calculated based on mechanical equilibrium. This enables dynamic quantification of construction disturbance effects, dynamically responding to changes in the spatial location of the discontinuous geological body, and improving adaptability to complex geological conditions and the accuracy of early warning for sudden water inrush disasters.

The invention belongs to the technical field of strength analysis of components of a wind generating set, and discloses a method for calculating load distribution, service life and rigidity of an asymmetric back-to-back three-degree-of-freedom single-row tapered roller bearing. Constructing a mechanical equilibrium equation set fusing the flange contact model and the bearing clearance parameter; rotation-revolution kinematics characteristics of a roller and a microcosmic contact deformation theory are coupled, contact pressure distribution of each slice is solved by adopting an iterative algorithm, and cooperative calculation of rigidity parameters of a large bearing and a small bearing is completed while non-uniform load distribution high-precision analysis and service life calculation of the bearing are realized. Compared with the existing statics technology, the method has the advantages that the load distribution solving efficiency and calculation precision of the asymmetric size bearing under the complex working condition are remarkably improved, theoretical support is provided for optimization design of a wind power bearing structure and improvement of the reliability of a transmission system, and a load-service life-rigidity three-in-one innovative analysis framework is established.

This invention discloses a numerical method for transparent characterization of stress fields in mining engineering, belonging to the field of numerical simulation. The method includes: constructing a standardized numerical computation environment and determining the target processing area; establishing a three-dimensional rock mass mesh model and performing mechanical equilibrium solutions, simultaneously acquiring stress component and elastic strain energy data to achieve stress-energy dual-dimensional characterization; based on preset target center coordinates, real-time analysis and direct storage of spatial distance and angle information of each mesh point; writing node coordinates, displacement, stress, energy, and element connection relationships into a unified ASCII universal format file to generate a cross-platform readable data file; and finally, data verification and output. This invention overcomes the limitations of traditional methods, such as single characterization dimension, reliance on third-party processing for spatial analysis, and difficulties in cross-platform data interaction, significantly improving the efficiency and accuracy of stability analysis in mining engineering.

The invention discloses an unmanned sailboat navigational speed prediction method based on a wind speed gradient and a wind-induced torsion effect, and relates to the technical field of unmanned sailboats. The aerodynamic model is constructed based on the wind speed gradient and the wind-induced torsion effect of the unmanned sailboat in the sailing process, the hydrodynamic model is constructed in combination with the condition of the flow field where the unmanned sailboat sails, the aerodynamic model is used for simulating the wind condition of the unmanned sailboat in the sailing process in computational fluid dynamics software, aerodynamic parameter data are obtained, and the aerodynamic model is used for simulating the wind condition of the unmanned sailboat in the sailing process. Meanwhile, a hydrodynamic model is used for simulating the stress condition of the unmanned sailboat during sailing, hydrodynamic parameter data are obtained, the aerodynamic parameter data and the hydrodynamic parameter data are input into numerical calculation software, expressions of all gas-water dynamic parameters are determined in a fitting mode and applied to a three-degree-of-freedom mechanical equilibrium equation set, and a three-degree-of-freedom mechanical equilibrium equation set is obtained; by solving a three-degree-of-freedom mechanical equilibrium equation set, accurate prediction of navigation parameters of the unmanned sailboat under the condition of a complex wind field is realized, and a foundation is laid for guiding autonomous navigation and track optimization of the unmanned sailboat.