143 results about "Equivalent stiffness" patented technology

The invention discloses a metro shield tunnel crack width refined numerical simulation method under surface loading, and the method comprises the following specific steps: describing the overall stress deformation characteristics of a soil body-shield tunnel structure based on a stratum-structure method, and simulating a macroscopic equivalent model by adopting a continuous medium model, and the equivalent stiffness reduction effect caused by the influence of longitudinal seams and circular seams is fully considered, the most unfavorable section position along the shield tunnel is determined, so that the key section is replaced with a refined model considering local hand hole weakening, multi-contact and built-in steel bars, and the shield tunnel crack evolution characteristics are described by adopting a total strain crack model. And obtaining the millimeter-scale crack width of the target tunnel structure based on a load-structure method. According to the analysis method, the millimeter-scale crack width of the shield tunnel under the action of ground surface loading can be accurately obtained, the structure safety state can be rapidly evaluated in combination with current specifications, and an important basis is provided for operation and maintenance of the subway shield tunnel.

The invention relates to the technical field of vibration tests, in particular to a ground resonance test suspension device and a test method. The ground resonance test suspension device is provided with a bearing frame body, a hoisting mechanism, a bearing mechanism and a suspension mechanism, the bearing frame body is composed of a bearing supporting column, a cross beam and a longitudinal beam, and the position of the cross beam can be adjusted; a bracket of the bearing mechanism is provided with a bottom beam, an auxiliary supporting beam and a supporting beam, and a flexible air cushion is arranged on the supporting beam. A flexible supporting unit of the suspension mechanism is provided with a main spring rope, an upper hanging scaffold, a lower hanging scaffold and an auxiliary spring rope, and an auxiliary spring rope connecting unit can control the state of the flexible supporting unit. The invention further provides a ground resonance test method which comprises the steps of suspension pretreatment, aircraft suspension and test, and the equivalent stiffness of the suspension mechanism can be adjusted. The aircraft suspension system can adapt to different aircraft sizes and weight distribution, and the equivalent stiffness of the whole suspension system can be adjusted to meet the test support frequency requirement.

The invention discloses a nonparametric prediction method for the fatigue life of a steel-FRP composite bar, and belongs to the field of fatigue performance evaluation of civil engineering materials and structures, and the nonparametric prediction method comprises the following steps: initializing component material attributes, load conditions and initial states of the steel-FRP composite bar, the component materials comprising an inner core steel bar and an FRP layer; according to an equivalent stiffness distribution principle, fatigue stresses of the component materials are calculated respectively; according to the fatigue stress of the component material, theoretical fatigue life of the component material is obtained in combination with the S-N curve relation, and cyclic jumping is executed; calculating accumulated fatigue damage of the component materials respectively based on results after cyclic jumping; and circularly updating the dynamic stiffness and the equivalent cycle number of the component material until the accumulated fatigue damage of any component material reaches a critical threshold value, judging that the component material is invalid, and outputting the fatigue life. According to the method, the fatigue life of the steel-FRP composite rib can be efficiently and accurately predicted, and the test cost is remarkably reduced.

The invention discloses a side face direct-insertion wiring terminal block structure and an elastic piece simulation design method of the side face direct-insertion wiring terminal block structure. Comprising an insulating shell, a conducting strip, a first elastic piece, a second elastic piece and a push block abutting against the elastic pieces, a wire can be inserted along the side face and clamped by a wire clamping block, and electricity conduction and disengagement prevention are achieved; the elastic piece is made of a metal material with resilience, and the elastic piece is bent to form a mounting part and a camber beam structure so as to provide stable clamping force. In order to optimize the performance of the elastic sheet, a simulation design method is adopted to establish an elastic sheet finite element model, set material attributes and constraint and loading conditions, carry out mesh refinement on a bending area and a wire clamping opening, start large deformation analysis and draw a force-displacement curve, so that the equivalent stiffness, the maximum stress and the deformation of the elastic sheet are obtained. Through simulation comparison of different design schemes, the optimal structure meeting the strength and resilience requirements can be determined. According to the invention, the stable conduction of the side plugging terminal and the predictable design of the performance of the elastic sheet are realized, and the assembly reliability and the design efficiency are improved.

The invention discloses a load distribution method and system for multi-pier coordination of a scouring damaged beam bridge and a storage medium. The method comprises the steps that horizontal and vertical loads acting on a bridge superstructure are obtained; calculating a load distribution result of a vertical load acting on the upper structure of the bridge on the pier according to the counter-force influence line; calculating the horizontal load which acts on the upper structure of the bridge and is distributed to the pier by adopting an iterative method, namely calculating the pier top displacement according to the latest calculated horizontal load of the pier, calculating the equivalent stiffness according to the latest calculated pier top displacement, recalculating the horizontal load distributed to the pier according to the latest calculated equivalent stiffness, and calculating the horizontal load of the upper structure of the bridge according to the calculated equivalent stiffness. The pier top displacement is the pier top displacement of the pier-pile foundation under the conditions of scouring damage, flood load and vehicle load. According to the method, the influence of scouring damage, flood and vehicle load on load distribution is considered, and the accuracy of full-bridge bearing characteristic analysis is improved.

The invention discloses a numerical simulation analysis method for a near-river ultra-deep foundation pit under the action of seepage flow, and the method comprises the following steps: S1, constructing a three-dimensional numerical model based on finite element software PLAXIS 3D, and constructing a non-uniform stratum model in combination with a Borehole module; s2, fine modeling is conducted through the underground diaphragm wall, the reinforced concrete supports and the latticed columns; s3, simulating a small strain hardening characteristic and a rigidity attenuation effect of the soil body by adopting an HSS model; s4, simulating underground water flow by combining plastic steady-state seepage analysis, and simplifying the three-axis cement mixing pile into an underground diaphragm wall structure through an equivalent stiffness principle; and S5, step-by-step excavation and support sequential control construction procedures are adopted, and finally, the reliability of the model is verified by comparing a horizontal displacement simulation result of the diaphragm wall with field monitoring data. According to the method, the foundation pit deformation rule is predicted through HSS constitutive model and seepage coupling analysis, and the foundation pit deformation prediction precision is remarkably improved.

The invention discloses a frame structure design method based on rigidity reduction. The method comprises the following steps that 1, rod end bending moments Mb and Mc and axial force Nc of frame beams and columns are obtained through calculation; step 2, obtaining actual reinforcement areas Asb0 and Asc0, section sizes and concrete strength of frame beams and columns; 3, the equivalent stiffness Kb1 of the frame beam is obtained through calculation according to the formula Kb1 = Mb0.75y / phi b0.75y; 4, the equivalent stiffness Kc1 of the frame column is obtained through calculation according to the formula Kc1 = Mc0.75y / phi c0.75y; 5, comparing the equivalent stiffness of the frame beam and the frame column with the initial flexural stiffness, and ending after the deviation is less than or equal to 15%; 6, calculating a shear force design value of the frame beam, calculating stirrups needing to be configured for the frame beam, and rechecking a shear-resistant section; and 7, calculating a shear force design value of the frame column, calculating stirrups needing to be configured for the frame column, and rechecking a shear-resistant section. Compared with the prior art, an overall calculation model of the frame structure is established, the real rigidity of a structural member is obtained through multiple iterations, section reinforcement is optimized, and the reinforcement amount is reduced; and the overall anti-seismic performance is improved.

The invention discloses a viscoelastic boundary verification method, device and equipment based on isoparametric elements and a medium, and the method comprises the steps: building a three-dimensional geometric model of a target structure according to geometric dimensions and material attributes, discretizing the three-dimensional geometric model into initial three-dimensional subunits, and then building an initial finite element mesh model; after identifying a target boundary surface to be applied with an artificial viscoelastic boundary, assigning boundary parameters to obtain each three-dimensional subunit and form a finite element model; all the three-dimensional subunits are mapped to a standard unit through equal-parameter coordinate transformation, an equivalent stiffness coefficient matrix and an equivalent damping coefficient matrix are obtained through calculation and then stacked and assembled, and an overall stiffness matrix and an overall damping matrix are formed; and calculating displacement response data based on the overall stiffness matrix and the overall damping matrix. According to the embodiment of the invention, by introducing the isoparametric coordinate transformation, the irregular boundary form can be directly processed without introducing an additional boundary unit, and the calculation requirement of an actual complex engineering model is met.

The invention belongs to the field of industrial control, particularly relates to a cone floating sleeve drill bit bearing analysis method based on cloud computing, and aims to solve the problem that systematic errors are generated in fault diagnosis due to the fact that the actual working condition influence is ignored in the related technology. The method comprises the following steps: acquiring a bearing vibration signal; working parameters are determined, signal decomposition operation is executed according to the working parameters, and bearing characteristic components are obtained; according to the bearing characteristic component and the environmental parameters, determining an equivalent stiffness tensor of the cone floating sleeve drill bit bearing working under a preset working condition, and according to the equivalent stiffness tensor, solving a bearing system dynamic model to obtain evolution field data; determining a target feature vector according to the bearing feature component and the evolution field data, and mapping the target feature vector to a preset fault feature space; and determining the distance between the target feature vector and the plurality of typical fault feature vectors, and determining a bearing control strategy of the cone floating sleeve drill bit according to the distance. When the method is applied to bearing analysis, the accuracy is higher.

The invention discloses a parameter checking and estimating method for an anti-impact isolator with spring pre-tightening force. The method comprises the following steps: acquiring parameters of the anti-impact isolator; determining equivalent stiffness, equivalent damping and equivalent pre-tightening force based on the parameters so as to convert the anti-impact isolator model into a single-degree-of-freedom mechanical model and obtain a single-degree-of-freedom kinetic equation with pre-tightening force; obtaining a target impact spectrum, and determining the acceleration of the upper platform and the relative displacement of the upper platform and the lower platform of the anti-impact isolator under the target impact spectrum in combination with the single-degree-of-freedom kinetic equation; if the acceleration of the upper platform and the relative displacement of the upper platform and the lower platform are both smaller than the maximum acceleration index and the maximum relative displacement index, the parameters serve as dynamic simulation initial parameters, and otherwise the parameters are adjusted. By calculating the equivalent stiffness, the equivalent damping and the equivalent pre-tightening force, an anti-impact isolator model is simplified into a single-degree-of-freedom mechanical model, and rapid checking and estimation of design parameters are achieved.

The invention relates to the technical field of simulation calculation, in particular to a simulation calculation method of a U-shaped steel-encased-concrete composite beam, which comprises the following steps: S1, establishing a two-parameter interface equivalent stiffness model of the U-shaped steel-encased-concrete composite beam with a rear anchor bolt; s2, solution and response extraction; s3, calculating a slip residual error and interface energy, and judging whether a target slip feature is met or not according to a double-convergence criterion; if the convergence requirement is not met, adaptively updating the interface parameters and returning to S2 for repeated solution, and if the convergence criterion is met, applying the converged interface rigidity parameters to design feedback of pretightening force selection of the rear anchor bolts and anchor bolt spacing and node construction of the rear anchor bolts. According to the method, the two-parameter interface equivalent stiffness model and the adaptive algorithm based on the slip residual error enable the interface normal stiffness and the interface tangential stiffness to be automatically converged to the target slip characteristic, manual parameter adjustment is avoided, the simulation stability and the calculation precision are improved, and integration of composite beam structure design and simulation analysis is achieved.

The invention provides a dense pre-support structure thin shell mechanical modeling method, and relates to the technical field of tunnel engineering soft stratum pre-support structure mechanical modeling, and the method comprises the steps: calculating the equivalent stiffness of a pipe shed-jet grouting pile composite layer based on a Voigt theory; establishing a continuous thin shell model taking the control equation as a core; constructing a plastic / elastic disturbance partition in front of the tunnel face and a four-section type boundary condition of a supporting structure through a Pasternak foundation model; and solving the constructed continuous thin shell mechanical model through a finite difference method to obtain radial displacement, and completing mechanical modeling of the tunnel engineering soft stratum pre-supporting structure. The continuous thin shell model designed by the invention can provide high-reliability theoretical support for tunnel pre-support design.

The invention relates to the technical field of ductile structure system analysis and design, and provides a design method of a ductile supporting frame structure and a numerical analysis model based on a beam unit fiber section. By controlling the rigidity ratio of the frame to the support and the section parameter ratio of the connecting piece to the support, the section parameter design limit value of the ductility connecting piece is given, and the ductility of the structure is ensured. Secondly, based on an equivalent stiffness principle, a ductile support bilinear skeleton calculation model considering stiffness degradation is provided, then an existing buckling-restrained support calculation model is improved, and the mechanical behavior of the whole support is simulated by adopting plastic connection units and beam unit fiber sections; and forming a numerical calculation model of the ductile support steel frame structure based on the fiber section of the beam unit. The model can accurately simulate the mechanical characteristics of the overall support and the structural system thereof, the huge workload of multi-time iterative modeling is omitted, the analysis cost is low, and the efficiency and simulation precision are higher.

The invention discloses a reinforced concrete bonding performance sequence progressive analysis and prediction method considering interface friction and differential slip characteristics. The method comprises the following steps: (1) establishing a reinforcement rib front concrete equivalent stiffness calculation model; (2) quantifying the interface friction force when the reinforcing steel bar slides; (3) considering concrete damage, and calculating the slippage extrusion force of a single circle of reinforcement ribs; (4) dividing the member into a plurality of segments, and calculating the total concrete reaction force caused by differential slippage in each segment; and (5) determining the average bonding stress, and drawing a bonding stress-slip curve of the loading end and the free end. According to the method, the interface friction effect and the slippage difference caused by steel bar deformation are innovatively and systematically considered, and the problem that a traditional model does not fully reflect the two key factors is solved. Compared with an existing method, the method is higher in prediction precision and clear in calculation process, and a more reliable theoretical basis can be provided for adhesive property evaluation, anchoring design and durability analysis of the reinforced concrete structure.

The invention discloses an electrostatic tuning optimization method and device for a metal resonator gyroscope. The method comprises the following steps: establishing a dynamic model based on structural symmetry disturbance and a coupling stiffness effect; based on the dynamic model, calculating modal frequency distribution of the metal resonator gyroscope under different azimuth angles to obtain modal frequency difference data, and based on the modal frequency difference data, constructing an equivalent stiffness distribution model, and quantifying stiffness nonuniformity of the resonant structure to obtain a stiffness matrix; based on the stiffness matrix, voltage control parameters corresponding to the azimuth angles are obtained, the voltage control parameters are applied to the multiple electrostatic tuning electrodes, and an optimized stiffness matrix is obtained; and recalculating the modal frequency of the metal harmonic oscillator based on the optimized stiffness matrix. The invention solves the technical problem that the prior art is mainly suitable for the inertial device before or after packaging but is difficult to effectively eliminate the frequency cracking after packaging.

The application provides a piezoelectric energy feedback suspension equivalent stiffness and damping measurement method and device, and relates to the technical field of suspension stiffness and damping measurement. The method comprises the following steps: building a test platform; simulating the motion process of the excitation gear and the piezoelectric cantilever beam when the piezoelectric energy feedback suspension vibrates, obtaining the vibration displacement of the free end of the piezoelectric cantilever beam, and measuring the voltage signal generated by the piezoelectric cantilever beam during the vibration process; obtaining the speed change curve of the free end of the piezoelectric cantilever beam based on the change of the vibration displacement with time; drawing the voltage change curve of the piezoelectric cantilever beam during the vibration process according to the voltage signal; obtaining the continuous stiffness of the piezoelectric cantilever beam, so as to obtain the equivalent stiffness and equivalent damping of the piezoelectric energy feedback suspension. The application can measure the equivalent stiffness and damping of the piezoelectric energy feedback suspension, and provides a theoretical basis for the dynamic characteristic analysis and real vehicle application of the piezoelectric energy feedback suspension.

The present disclosure provides a Timoshenko beam model equivalent method and system of a corrugated steel plate support structure, and relates to the technical field of stress analysis of a corrugated steel plate support structure, comprising: solving the stiffness coefficients of the corrugated steel plate in a local coordinate system, including tensile stiffness, bending stiffness and shear stiffness; solving the equivalent stiffness coefficients of the orthotropic corrugated steel plate in a global coordinate system, including equivalent tensile stiffness, equivalent bending stiffness and equivalent shear stiffness; solving the equivalent section bending stiffness of the corrugated steel support structure; solving the equivalent section shear stiffness of the corrugated steel support structure; and equivalent the corrugated steel support structure to a Timoshenko beam model. The present disclosure can realize the rapid equivalent of the corrugated steel plate support structure to a Timoshenko beam model.

The application provides a chain calculation method of a suspension type steel structure support system based on elastic stability theory, and belongs to the field of foundation pit support, and comprises the following steps: a mechanical calculation model is established, the stiffness of the first layer truss and the suspension component is synthesized into equivalent stiffness according to a series coupling relationship, and the support effect of the upper structure on the support component is equivalent to an elastic support; based on the mechanical model, a deformation coordination equation is established by using the force method principle, a flexibility matrix is constructed, and the second order effect caused by the axial force and the rotation and translation coupling effect are considered; the last support component is taken as a starting point, each support component is sequentially solved from bottom to top, the support reaction force of the current support component at the elastic support is taken as an equivalent external load and is applied to the corresponding elastic support of the adjacent upper support component, and the internal force and deformation distribution of the whole suspension type steel structure support system are obtained by combining the deformation coordination equations of each support component. The method avoids the problem of large calculation workload of the finite element method.

The application discloses a six-stable-state piezoelectric vibration energy collector, which comprises a base, a cantilever beam, ring magnets, rectangular magnets, MFC piezoelectric sheets and wires. The six-stable-state design of the collector is realized by finely adjusting the equivalent stiffness of the piezoelectric beam, the size and magnetization intensity of the magnets, and the spatial layout of the magnets. When the base is subjected to external excitation in the vertical direction, the MFC piezoelectric sheet on the cantilever beam is subjected to extrusion to generate a voltage difference, and the vibration energy is effectively converted into electric energy. The traditional six-stable-state system needs at least six magnets, and the application only needs to configure four magnets to realize the six-stable-state characteristics. The application not only greatly simplifies the design, simulation and installation process of the multi-stable-state collector, but also brings a new breakthrough to the piezoelectric energy collection technology; and the application also provides a scientific method for determining the stable-state number of the collector, lays a solid theoretical foundation for the manufacture and application of the collector, and has a wide application potential.

The invention relates to the technical field of earthquake resistance of bridge engineering, and particularly discloses a railway beam bridge damping system based on metal damper coordination and a design method.The railway beam bridge damping system adopts direct displacement design based on equivalent linearization and comprises the steps that firstly, shock insulation displacement and an initial equivalent damping ratio are set as design parameters; the design displacement target is achieved within the reasonable range of the two parameters, accurate calculation can be conducted according to specific structural requirements, blind accumulation only based on the number of existing dampers in previous design is avoided, and design pertinence and scientificity are effectively improved. On the premise that different metal dampers are combined, the independent design of the equivalent damping ratio and the equivalent rigidity is achieved, the flexibility of the damping design is improved, the damping design of a common railway beam bridge is optimized, and the cost of the damping device is reduced.

The present invention discloses a method for identifying nonlinear parameters of structural clearances. First, a mathematical model of the structural clearance nonlinear system is established; then, the frequency response function of the system under sinusoidal sweep excitation is obtained through the input-output response of the system; in the frequency response function, a pair of symmetric displacement points exist at any displacement response amplitude to define the same displacement frequency response function. By defining the real and imaginary parts of the displacement frequency response function through the symmetric displacement FRF points at each given displacement response amplitude, the natural frequency of the system related to the displacement response amplitude can be obtained; then, the expression of the nonlinear equivalent stiffness of the system is extracted through the simulation analysis of the model, and the equivalent stiffness curve of the system is further obtained through the model simulation data; finally, based on the particle swarm algorithm, the clearance characteristic parameters are obtained by curve fitting according to the equivalent stiffness expression obtained by integration and the equivalent stiffness curve obtained by model simulation; the present invention can identify the clearance nonlinear parameters more quickly and accurately globally.

The invention relates to the technical field of disassembly-free cement fiber truss plate construction, in particular to a construction method of an energy-saving sloping roof disassembly-free cement fiber truss plate system, which comprises the following steps: determining an initial support distance based on the daily average temperature difference between the roof slope angle of a sloping roof and the construction period; a formwork supporting system is installed, and truss plates are laid and fixed to serve as permanent formworks; a grading test load is applied to the permanent formwork, and whether the real-time safety margin of the formwork supporting system is qualified or not is determined based on the load ratio of the critical yield load to the designed wet concrete load, so that the initial equivalent stiffness is optimized; based on the distance deviation between the initial supporting distance and the actual supporting distance, the reinforcing mode of the formwork supporting system is determined; concrete is poured on the reinforced formwork supporting system and vibrated and compacted, and the preset ratio is optimized based on the compactness characterization value of the concrete layer after vibration is finished; curing of the concrete layer is completed, acceptance check is conducted, and construction of the truss plate system is completed. The construction safety risk is reduced.

The invention discloses a high-overload gyroscope impact resistance design method based on a multi-section trial function energy method, and belongs to the technical field of micro electro mechanical system structure design. Comprising the following steps: constructing a physical model; establishing a trial function; calculating out-of-plane bending flexibility of the novel structural beam; introducing a torsion correction term and an outer frame equivalent flexibility; the flexibility is accumulated, and the reciprocal is taken to obtain the out-of-plane total rigidity; and the out-of-plane rigidity is applied to construction of an impact kinetic equation. A traditional Euler-Bernoulli beam theory cannot effectively consider the influence of rigidity coupling and torsional deformation of multiple sections of beams and the rigidity of an outer frame on the overall rigidity of a structure. According to the method, the out-of-plane equivalent stiffness of the novel structural beam and outer frame combined structure can be quickly estimated and obtained, the obtained stiffness parameter is applied to dynamic characteristic analysis of the gyroscope, and effective theoretical support is provided for design and engineering application of the novel structural beam structure of the high-overload gyroscope in the out-of-plane direction.

The invention belongs to the technical field of photovoltaic power generation engineering structure test and optimization, and provides a photovoltaic module frame and connecting piece optimization method and system based on a strength test, and the method comprises the steps: fixing two ends of a frame through a preset tensile test upper clamp, fixing a purline through a preset tensile test lower clamp, and carrying out a tensile test; through the action of a preset shear test upper clamp on the frame, the purline is fixed by the frame through a shear test lower clamp, and a shear test is carried out; according to the tensile measurement rigidity, the temperature correction coefficient and the pre-tightening force attenuation coefficient, correcting to obtain the tensile equivalent rigidity under the actual working condition; correcting to obtain the shear equivalent stiffness under the actual working condition through the linear section slope and the environment friction correction coefficient; the difference between the environment such as temperature and the actual working condition environment of photovoltaic module service is considered, module optimization is performed through the actual working condition tensile equivalent stiffness and the actual working condition shear equivalent stiffness obtained through correction, and the photovoltaic module optimization effect is ensured.

The invention belongs to the field of mechanical simulation analysis of composite material structural parts, and particularly discloses an equivalent mechanical modeling method of a variable-thickness composite material component, which comprises the following steps: acquiring a laying deformation measure, and determining deformation distribution of fiber cloth by using the laying deformation measure through a fishing net method; mapping the deformation distribution of the fiber cloth to a target structure grid by using a grid mapping method; constructing a numerical model of equivalent mechanical characteristics of the target structure grid by using a multilayer structure equivalent calculation formula; the equivalent mechanical characteristics comprise equivalent density, an equivalent stiffness matrix and an equivalent damping matrix; and determining a numerical value implementation program of the numerical value model, and performing equivalent mechanical analysis simulation on the variable-thickness composite material component by the numerical value model through the numerical value implementation program by adopting a finite element method. According to the method, the modeling accuracy of the variable-thickness composite material component is improved.

The application discloses a kind of water turbine rotor dry mode model updating method and related device, comprising: forming numerical modal family;Equivalent boundary parameter and key connecting surface equivalent stiffness are set;Under the predetermined rotating speed set, calculate centrifugal prestress;On the basis of the centrifugal prestress, consider gyroscopic effect, sequentially solve each rotating speed condition, obtain the natural frequency and vibration mode branch varying with rotating speed;Identify test frequency, damping and vibration mode;With adjacent sector vibration mode phase difference consistency and vibration mode energy distribution as criterion, carry out node radial number determination to test vibration mode, and with the numerical modal family is matched one by one;With the deviation of test frequency and mode assurance criterion as comprehensive target, the equivalent boundary parameter and key connecting surface equivalent stiffness are carried out inversion updating, until meeting preset convergence criterion, complete the updating of water turbine rotor dry mode model, the method and related device can reduce model scale and improve solving convergence.

The present application relates to the field of textile machinery and equipment damping, specifically warp knitting machine bed damping device and method thereof; containing damping base, negative Poisson's ratio lattice metal bearing framework, corrugated air chamber, venturi micro flow channel, composite fluid and electromagnetic coil and controller and other modules; The system fills the shear thickening and magnetorheological mixed composite fluid in the bearing cavity, cooperates with the bearing framework with three-dimensional interconnected pores, and occurs local shear thickening under high frequency impact; The core is that the controller extracts the high frequency vibration characteristics of the main shaft motor, combines the air chamber pressure pulse to solve the dynamic kinetic energy and total stiffness demand, and actively adjusts the electromagnetic coil current and duty cycle; The present application effectively avoids the dynamic hardening defect of traditional hydraulic damping, and realizes the active adjustment type energy consumption and self-adaptive compensation of equivalent stiffness for high frequency periodic impact.

The invention discloses a ship mooring part split design method based on multi-process forming parameter optimization, and relates to the technical field of ship structural part precision forming and process optimization design. The method comprises the following steps: generating a plurality of candidate split structure schemes and corresponding multi-process forming paths; working procedure state vectors used for representing the equivalent stiffness, the plate thickness change and the residual stress after the single-section structure is formed are constructed; establishing a cross-process state association mechanism based on process state vector recursion; based on the cross-process state correlation mechanism, stability analysis is conducted on forming parameters within the process disturbance range, and a forming parameter robust value interval meeting the target assembly precision requirement is determined; and performing quantitative comparison and optimization on each candidate split structure scheme based on the value interval. The technical problems that in the prior art, split design of ship mooring pieces depends on experience, the multi-process forming coupling effect is difficult to quantitatively evaluate, the assembly precision is difficult to guarantee, and the process robustness is insufficient are solved.

A flexible thin-wall crossed roller bearing multi-target parameter optimization method relates to the technical field of bearing design, and comprises the following steps: 1, establishing a parameterized system model containing a shaft system, a thin-wall crossed roller bearing and a box body assembly relation, the bearing model being determined by geometric and assembly parameters; 2, carrying out finite element modeling on the inner / outer ring of the bearing, and carrying out polycondensation on the degree of freedom of an interface to obtain an equivalent stiffness matrix; 3, inputting working conditions and material parameters, and setting a design variable feasible region and constraints; 4, coupling a mapping matrix to solve load distribution, calculating the maximum contact stress and the life damage rate, and constructing a dual-objective optimization model; 5, performing test design to obtain response data, and performing multi-target algorithm iterative optimization to obtain a Pareto optimal solution set; and 6, screening the solution set, and outputting a structure parameter combination meeting the requirement. The method can solve the problems that in the prior art, it is difficult to consider calculation efficiency and ferrule flexibility effect precision, and it is difficult to conduct rapid iterative optimization on roller load distribution and life / contact stress indexes.

The application discloses a preliminary design rapid estimation method and system for tower deviation of a multi-tower cable hoisting system, and relates to the field of tower deviation estimation in bridge construction technology.The estimation method comprises the following steps: calculating the single-span horizontal elastic stiffness of each span compression tower cable based on an equivalent elastic modulus method; calculating the total equivalent stiffness of each tower according to a series stiffness model, specifically comprising the following steps: first, calculating the corresponding left series stiffness and right series stiffness, and then adding the left series stiffness and the right series stiffness to the self equivalent stiffness of the tower to obtain the corresponding total equivalent stiffness; when a single tower is subjected to an external force, calculating the self deviation and the collaborative deviation of the adjacent tower based on a deviation influence coefficient; and when multiple towers are simultaneously subjected to force, calculating the total deviation of any tower by using a superposition principle.The application is suitable for rapid scheme comparison and selection in the preliminary design of a multi-tower cable hoisting system with any number of spans and towers, and has the advantages of strong universality, reliable precision, easy implementation and the like.