58 results about "Virtual work" patented technology

The invention discloses a robot intelligent management and control system for energy conservation and efficiency improvement of a cold end of an indirect cooling auxiliary unit, and belongs to the technical field of intelligent management and control, the robot intelligent management and control system comprises an initial evaluation module, a dynamic planning module and a feedback monitoring module, obtaining a scaling thickness distribution diagram and a scaling coverage rate, and generating a fin flow channel matrix model; the dynamic planning module is used for dividing virtual operation blocks, constructing a scaling planning path in combination with a cleaning index, carrying out rapid rough sweeping, carrying out cavitation early warning, and processing cavitation early warning through a hierarchical control architecture; and the feedback monitoring module is used for constructing a quality deviation set, screening out substandard virtual operation blocks, calculating and correcting priorities, sorting and grading, optimizing and correcting parameters by utilizing a genetic algorithm, and performing feedback regulation and control, so that the cold end heat exchange efficiency is improved to achieve an energy-saving target, a fin structure is protected, and the service life of equipment is prolonged.

The invention provides a control method and system for a five-degree-of-freedom marine crane under a non-inertial system, and relates to the technical field of automatic control of cranes. The method comprises the following steps: acquiring a real-time state variable of the crane under a non-inertial system; the state variables are input into a self-adaptive radial basis function neural network, a lumped disturbance estimated value is obtained, and the neural network is designed based on a five-degree-of-freedom dynamical model established by utilizing a Lagrange equation and a virtual work principle under a ship coordinate system and considering ship six-degree-of-freedom motion and installation position offset; calculating a tracking error function according to the state variable and the expected trajectory; and inputting the disturbance estimation value and the error function into a feedback controller, calculating to generate a control torque, and outputting the control torque to an execution mechanism to drive the crane to track an expected trajectory and suppress load swing. According to the method, direct modeling and control under a non-inertial system are realized, the problems of coordinate transformation disturbance and singularity caused by inertial system modeling are solved, and the trajectory tracking precision and the anti-interference robustness are improved.

The invention discloses a synchronous bidirectional coupling solving method for large deformation of a flexible slender beam under uniformly distributed pressure based on an accurate load stiffness matrix, and relates to the field of computational mechanics. According to the method, a local curve coordinate system and a uniformly distributed pressure vector function are constructed through an absolute node coordinate Euler-Bernoulli beam unit discrete beam structure, a unit external force vector is derived based on a virtual work principle, and a precise load stiffness matrix is obtained through a vector value function differential rule. The load stiffness matrix and the elastic tangent stiffness matrix are synchronously assembled in the Newton-Rafson iteration step, and synchronous bidirectional coupling solution of the load and the configuration is achieved. According to the method, the numerical value loading limit of a traditional method is broken through, error accumulation is avoided, the calculation stability and precision are improved, the large deformation and even post-buckling behavior of the flexible slender beam under the uniformly distributed pressure can be accurately analyzed, and the method is suitable for design optimization of related equipment in the fields of ocean engineering, mechanical engineering and the like.

The invention discloses a recruitment post recommendation method and device based on career prediction, and relates to the technical field of online recruitment. The method comprises the steps of obtaining user portrait data of a job seeker; predicting the next virtual work experience according to the resume information of the job seeker; vectorizing the next segment of virtual work experience to obtain vectorized representations of a plurality of virtual work experiences, and adding the vectorized representations to the user portrait data; performing vector retrieval on the vectorized representations of all the recruitment post information to obtain a plurality of vectorized representations of the recruitment post information matched with the vectorized representation of the virtual work experience; and filtering and sorting the recruitment post candidate set according to the screening conditions, and taking the sorted recruitment posts as recruitment post recommendation results of the job seekers. According to the method, strong dependence on user dominant requirements, resume integrity and behavior data is remarkably overcome, and the problems of fuzzy job application requirements, data sparsity and cold start are effectively solved.

The application discloses a rotor coupling dynamics calculation method of complex three-dimensional shape layout. A coordinate conversion relationship caused by a front protrusion / after-sweeping / downward-reversing configuration is established; nonlinear elastic deformation of elastic blades waving, oscillating and twisting and nonlinear coupling relationship among them are described; nonlinear motion caused by the complex three-dimensional shape layout is described based on the coordinate conversion relationship and the nonlinear coupling relationship; and the relationship among strain energy, kinetic energy and virtual work of external force of the rotor is established based on the Hamilton principle according to the description of the nonlinear motion, and a finite element method of a 15-degree-of-freedom beam element is used to establish a rotor dynamics equation. The application can effectively reflect the structural coupling characteristics and coupling degree of the waving-torsion direction caused by the front / rear sweep of the blade tip, effectively reflect the structural coupling characteristics and coupling degree of the oscillation-torsion direction caused by the upward / downward reversal of the blade tip, and effectively reflect the rotor dynamics characteristic behaviors caused by the three-dimensional shape of the blade.

The invention provides a path adjustment method and device, equipment and a storage medium. The method comprises the steps that an operation interface is displayed, the operation interface comprises a virtual path, a virtual operation topographic map and a path angle adjusting control, the virtual path is displayed in the virtual operation topographic map, and the path angle adjusting control is used for adjusting the angle of the virtual path in the virtual operation topographic map; in response to a first operation on the path angle adjustment control, the path angle adjustment control is rotated to a target scale, and the target scale corresponds to a first angle of the virtual path in the virtual operation topographic map; determining an angle change value based on the target scale; and adjusting the virtual path to the first angle according to the angle change value. According to the method, the angle of the virtual path in the virtual operation topographic map can be directly adjusted through the path angle adjusting control, the virtual path and the virtual operation topographic map are visually displayed through the operation interface, the adjusting efficiency and accuracy are improved, the adjusting effect is fed back in time, and then the path optimization efficiency is improved.

The present application belongs to the field of elastic motion modeling of air defense missiles, and particularly relates to an elastic motion modeling method for air defense missiles with trajectory control and direct-gas combined control, aiming at solving the problem that the traditional modeling method is insufficient in covering trajectory control force, thus being difficult to realize accurate modeling of the elastic motion of air defense missiles with trajectory control and direct-gas combined control. The present application comprises: calculating the kinetic energy T of the missile system caused by the bending deformation of the elastic missile body, the elastic potential energy U of the missile system, and the damping energy D of the missile system caused by the bending deformation of the elastic missile body; calculating the generalized force Q acting on the missile body corresponding to the virtual work through the virtual work principle i ; based on the kinetic energy T of the missile system, the elastic potential energy U of the missile system, the damping energy D of the missile system, and the generalized force Q i , constructing the dynamic equation of the elastic missile body through the Lagrange equation. The present application corrects and improves the problem of insufficient coverage of trajectory control force in the traditional modeling method, and has high accuracy and precision in the elastic motion modeling of air defense missiles with trajectory control and direct-gas combined control.

The invention discloses a dynamic modeling and performance analysis method for a quartz double-end tuning fork resonator, and the method comprises the steps: constructing a high-order displacement field which meets the condition that the free boundary stress is zero in prior to describe the deformation of a mass block, and employing a coupling scheme based on a virtual work principle; the tuning fork arms and the mass block are integrated into an energy conservation dynamic self-consistent system. According to the method, the linear characteristic frequency and modal of the system are solved, then geometric nonlinearity is introduced, and the amplitude-dependent nonlinear frequency response is accurately calculated through an iterative algorithm. According to the dynamic modeling and performance analysis method for the quartz double-end tuning fork resonator, the fundamental frequency prediction error is reduced to 0.34% from 1.6% of a traditional model, and the relative precision is improved by 79%; meanwhile, the non-physical residual stress at the free boundary is restrained to the magnitude of the maximum stress in the domain, the boundary stress distortion is fundamentally eliminated, and a reliable theoretical tool is provided for accurate design and optimization of the high-performance MEMS resonator.

The invention provides a numerical simulation method for fluid-structure interaction vibration of wind tunnel airflow and a tunnel wall structure, and belongs to the technical field of wind tunnels. Geometric parameters of a wind tunnel section are obtained, a multi-layer grid sequence is established, an implicit Runge-Kutta format and an explicit Newmak method are adopted to solve a flow field and a structure field respectively, and the wind tunnel airflow and tunnel wall structure fluid-structure interaction vibration is obtained. Mesh deformation is realized by using tightly-supported radial basis function interpolation, a volume conservation constraint is introduced, an interface projection matrix is constructed based on a virtual work equivalence principle to transmit interface data, a force balance and displacement coordination constraint is introduced, and coupling iteration convergence is accelerated through an inverse Broyden formula. A density gradient shock wave sensor is adopted to drive grid adaptive encryption and a mixed indicator function to control turbulence model switching, and the technical problems that wind tunnel section airflow and wall surface structure fluid-structure interaction vibration numerical simulation calculation is low in efficiency and insufficient in precision are solved.

The invention discloses a rotary steerable drilling tool, a posture correction method and system thereof and a medium, and particularly relates to the technical field of oil field drilling engineering, and the method is technically characterized in that the method comprises the steps that the internal friction torque and the eccentric torque of the rotary steerable drilling tool during underground work are obtained; dispersing the drill string into a structural model comprising at least one beam unit by utilizing a finite element method, and analyzing the dynamics of the rotary steering drilling tool by utilizing the structural model in combination with a virtual work principle to obtain a dynamic analysis result of the rotary steering drilling tool; constructing a first relation model by using the internal friction torque, the eccentric torque and the drilling fluid flow; obtaining attitude data of any hole drift angle and a tool face angle of the rotary steering drilling tool, and constructing a second relation model between the theoretical measured value of the well track and the actual measured value of the well track; and constructing a well track correction matrix error model through the first relation model, the second relation model and a preset flow feed-forward compensation algorithm.

The invention belongs to the field of numerical control machining and manufacturing, and discloses a mechanical structure frequency response function identification method based on variable spindle rotating speed excitation. Taking cutting force borne by a tail end cutter as a quasi input signal, taking a machine tool driving shaft tracking error as an output signal, and determining a signal sampling period according to an identification precision requirement; according to the virtual work principle, the cutting force borne by the tail end cutter is converted into equivalent loads of all driving shafts of the machine tool in combination with a machine tool Jacobian matrix; then, calculating a cross-power spectrum of the input signal and the output signal and an auto-power spectrum of the input signal by using fast Fourier transform; and finally, the frequency response function of the mechanical structure can be obtained by calculating the ratio of the cross-power spectrum to the self-power spectrum. The method effectively avoids physical damage to the mechanical structure of the numerical control machine tool caused by an existing excitation identification method, has the advantages of being simple and easy to operate, and has great significance in perfecting the efficient and high-precision machining technology of mechanical parts.

The invention belongs to the technical field of protection, and particularly relates to a method and device for evaluating the damage degree of a functional gradient multilayer metal plate under a near-field explosion load. The method specifically comprises the following steps: determining the pulse pressure generated by explosion according to the spatial distribution characteristic of the peak value of the pulse pressure on a loaded surface and the attenuation change rule of the pulse pressure along with time; calculating the plastic work of the first layer of metal according to the plastic strain component expression of the first layer of metal and the incompressibility principle; according to the plastic work of the first layer of metal, the total kinetic energy of the multiple layers of metal plates and virtual work of pulse pressure generated by explosion on virtual displacement, a control differential equation of transverse displacement of the multiple layers of metal plates is obtained; solving the differential equation to obtain the maximum lateral displacement of the multilayer board, calculating the average strain rate according to the maximum lateral displacement, and updating the flow stress; the differential equation is solved again through the flow stress obtained through updating till the set condition is met, and the currently obtained maximum transverse displacement of the multi-layer board serves as the damage degree.

The invention relates to a parallel type six-degree-of-freedom force feedback master manipulator and system, and belongs to the technical field of robot teleoperation and man-machine interaction. The master manipulator comprises a frame type base, six motor modules integrated with angle and current detection units, a motor connecting rod, a platform connecting rod, a motion platform and a rocker integrated with a force sensor. A current closed loop is arranged in the motor module, and high-precision torque control is achieved. Six-degree-of-freedom motion is achieved through a spherical hinge space connecting rod mechanism formed by a motor connecting rod and a platform connecting rod. The master manipulator control unit receives the angle information of the motor, and the forward kinematics pose of the motion platform is solved through nonlinear least square numerical iteration; meanwhile, a Jacobian matrix is constructed based on the virtual work principle, and the expected generalized force at the tail end is mapped into a torque instruction of each motor, so that high-fidelity force feedback is realized. The device is compact in structure, high in rigidity and fast in dynamic response, the integrated force sensor can accurately sense the force application intention of an operator, and the device is suitable for teleoperation scenes such as nuclear environments and minimally invasive surgeries.

The present application relates to the field of material mechanical property characterization, in particular to a high-temperature thermal softening variable stiffness and strength metal elastic-plastic parameter global characterization method, comprising: obtaining strain field data and temperature field data of the test piece, and tensile load data; constructing a thermal-mechanical coupling elastic-plastic constitutive model of the metal plate, and establishing a target function of temperature-related parameters to be solved under the constraint of multiple virtual fields based on the virtual work principle; accurately identifying high-temperature thermal softening elastic parameters by using elastic stage data, and then identifying anisotropic strength thermal softening plastic parameters by using composite field data of the whole loading process under variable stiffness; the present application breaks through the condition restriction of constant stiffness when characterizing thermal-mechanical coupling properties of metal materials by using existing test methods, and can realize global accurate characterization of high-temperature thermal softening and anisotropic complex elastic-plastic thermal-mechanical coupling property parameters by only one test, thereby minimizing the number of tests and simplifying the test process.

The invention discloses a particle earth and rockfill dam large deformation calculation method based on node integration, and relates to the technical field of geotechnical engineering large deformation. The method comprises the following steps: establishing a generalized shape function and a strain displacement matrix of a proportion boundary finite element SBFEM under a Laplacian equation; under an updated Lagrange framework, state variables at Gaussian integral points of the triangular SBFEM unit are projected to nodes through a strain smoothing technology, a momentum equation is converted into a balance equation based on node integration through a virtual work principle and a Green divergence theorem, and the dynamic equation is solved through a central difference method; and when the grid distortion degree reaches a significant level, discarding the current grid and performing re-grid division. All state variables such as stress, displacement, speed and the like are concentrated on nodes of abandoned grids, so that the subsequent grid generation and calculation process can be seamlessly continued. According to the invention, continuous simulation of the whole large deformation process based on the proportional boundary finite element method is realized.

The application discloses a method for analyzing bearing capacity of two-span concrete floor slabs under column end constraints, comprising: obtaining position parameters of the concrete floor slabs, calculating displacement coefficients of different beams based on the position parameters; establishing slab plane equations of a yield line load stage based on the displacement coefficients, obtaining slab rotation angles of each slab along x and y coordinate axes based on the slab plane equations; calculating yield line load values according to the virtual work principle based on the slab rotation angles; calculating membrane force parameters based on force balance equations, moment balance equations and elliptical regions of each slab; establishing plane equations of each slab under a limit state, calculating bearing capacity increase coefficients according to the plane equations; obtaining a total increase coefficient based on the force equivalence principle, and obtaining a limit bearing capacity based on the total increase coefficient and the yield line load values. The application can make the bearing capacity of the reinforced concrete floor slabs under column end constraints have a smaller error compared with the actual situation.

The application discloses a rigidity design method of a self-standing reinforced steel chimney, and belongs to the technical field of structural engineering. Firstly, according to the chimney size of the preliminary design and the basic wind pressure value of the design, the standard value of the along-wind load and the equivalent static load of the transverse-wind vortex-induced resonance are respectively calculated, and based on the virtual work principle of structural mechanics, a theoretical solution of the top horizontal displacement of the chimney is obtained. Secondly, considering the influence of the deformation characteristics of the chimney shell and the like, the theoretical solution is multiplied by a maximum horizontal displacement correction coefficient to obtain a real value of the maximum absolute value of the horizontal displacement of the top of the chimney cylinder. Finally, whether the real value of the horizontal displacement exceeds the limit value of the specification is checked to determine whether the chimney wall thickness needs to be increased to improve the rigidity. The application is accurate and reliable, simple to calculate, can save the building materials as much as possible under the premise of ensuring the reliable rigidity of the chimney cylinder structure, and is helpful to obtain a reasonable and reliable rigidity design scheme of the self-standing reinforced steel chimney under the combined action of the along-wind load and the transverse-wind load.

A system for generating a work plan for autonomous operation of a compactor in tandem with an earthmoving machine includes a first controller that receives information pertaining to a work area on which the earthmoving machine is required to perform at least one operation. The system also includes a central controller that receives, from the first controller, information pertaining to the work area on which the compactor is required to perform the at least one operation and analyzes the work area for virtually segmenting the work area into a plurality of virtual work areas, and data indicative of a movement of the earthmoving machine through each virtual work area from the plurality of virtual work areas. The central controller determines an optimal direction of movement for the compactor based on the data indicative of the movement of the earthmoving machine, topographical conditions, as well as geometry of the work area.

This invention provides a control method and system for a five-degree-of-freedom marine crane in a non-inertial frame, relating to the field of crane automatic control technology. The method includes: acquiring the real-time state variables of the crane in a non-inertial frame; inputting the state variables into an adaptive radial basis function neural network to obtain a lumped disturbance estimate, the neural network being designed based on a five-degree-of-freedom dynamic model established in the ship's coordinate system using the Lagrange equations and the principle of virtual work, considering the ship's six-degree-of-freedom motion and installation position offset; calculating a tracking error function based on the state variables and the desired trajectory; inputting the disturbance estimate and the error function into a feedback controller to calculate and generate a control torque, which is then output to the actuator to drive the crane to track the desired trajectory and suppress load sway. This invention achieves direct modeling and control in a non-inertial frame, solving the coordinate transformation disturbance and singularity problems caused by inertial frame modeling, and improving trajectory tracking accuracy and disturbance rejection robustness.

The invention belongs to the field of multi-physics field coupling modeling and simulation, and relates to a space-time interpolation mapping method for simulation data of a multi-physics field collaborative heterogeneous model. In the aspect of spatial interpolation, target point data is calculated through source point data on the basis of Shepard interpolation, so that the boundaries of physical quantities are ensured. In the aspect of space-time mapping of physical quantities such as load and heat flow, based on the virtual work principle, physical quantity data of each discrete moment of one physical field A is utilized to calculate equivalent physical quantities of unit nodes of another physical field B, and equivalence of the physical quantities of the nodes is guaranteed; and then according to the law of conservation of momentum or energy, calculating the change of momentum in the time step length of the physical field B to obtain the equivalent physical quantity of the unit node in each discrete moment of the physical field B, thereby ensuring the conservation of the physical quantity of the node. The method is suitable for data interpolation and space-time mapping links in collaborative analysis and optimization design of multi-specialty and multi-physics field heterogeneous models.

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 invention provides a coupled six-degree-of-freedom elastic aircraft flight simulation method. The method comprises the following steps: step 1, modeling a kinematic equation of an aircraft; 2, according to the virtual work principle, modeling is conducted on a kinetic equation of the aircraft on the basis of the kinematic equation; 3, performing elastic correction on the airflow angle of the aircraft, and calculating aerodynamic force borne by the aircraft and corresponding aerodynamic torque according to the airflow angle subjected to elastic correction; calculating an external force, an elastic deformation generalized force and a moment borne by the aircraft; 4, substituting the external force, the torque and the elastic deformation generalized force borne by the aircraft into the kinetic equation in the step 2 to obtain a kinetic equation after elastic correction of the aircraft, and calculating flight parameters of the aircraft according to the kinetic equation so as to realize flight simulation of the aircraft; according to the method, flight simulation considering the aeroelastic effect and the rigid-elastic coupling effect at the same time can be achieved, and finally more accurate flight simulation is provided for the elastic aircraft.

The invention relates to a mixed tower conversion section real-time health monitoring method based on optical fiber sensing, and the method comprises the steps: obtaining multi-source sensing data of a mixed tower conversion section, carrying out the feature extraction and compensation operation based on the multi-source sensing data through a pre-constructed temperature-slippage two-stage decoupling model, and outputting pure mechanical strain data after the temperature interference is eliminated; on the basis of the virtual work principle, full-domain slip distribution inversion is carried out along a sensor layout path by utilizing pure mechanical strain data, and the circumferential slip physical quantity of the steel-concrete conversion section contact surface is obtained; and a health assessment result is generated based on the circumferential slip physical quantity, and when the health assessment result meets a preset triggering condition, a hierarchical control instruction is sent to a wind turbine generator master control system. The method has the characteristics of high accuracy, high reliability and high real-time performance in evaluation of the health state of the steel-concrete joint part, and can prevent serious accidents such as breakage of a steel-concrete section bolt or a steel strand and the like.

The present application relates to the technical field of bridge engineering, and provides a load-deformation determination method and system for a precast pier under compression-bending-shear-torsion action, which comprises determination of stage division and analysis assumption of a torsion moment-angle analysis model and a shear force-displacement analysis model of the precast pier under compression-bending-shear-torsion action; based on concrete mechanics parameters, a spatial truss model, the principle of virtual work and force balance, critical point calculation formulas of each stage of the two models are respectively established, and each model is simplified into a complete curve of the critical point connecting line; precast piers with different parameters are selected, the load-deformation analysis model is used to calculate the torsion moment-angle curve and the force-displacement curve, and comparison and verification are made with the test curve. The present application comprehensively considers the stiffness attenuation, crack development and deformation formation of each stress stage of the precast pier, can accurately reflect the dynamic relationship between the load and the deformation, and realizes accurate prediction of the change rule of the lateral force and the torsion moment of the precast pier with the loading displacement and the angle under compression-bending-shear-torsion load.

The invention relates to the technical field of rotary hearth furnace shock isolation devices, in particular to a rotary hearth furnace quasi-zero stiffness shock isolation device and a performance curve calculation method thereof.The device comprises a negative stiffness assembly, a positive stiffness assembly and an auxiliary assembly, the negative stiffness assembly provides negative stiffness through a spiral pre-pressing spring and a guiding structure, the positive stiffness assembly is borne by a positive stiffness spring, and the auxiliary assembly is connected with the spiral pre-pressing spring; the auxiliary assembly realizes force transmission and guiding through an outer bottom cylinder, an outer upper cylinder and the like, and the three cylinders cooperate to realize the quasi-zero stiffness characteristic; according to the calculation method, a total output and rigidity curve is obtained by deducing formulas of positive rigidity, inclined guide rod parameters, negative rigidity output and the like in combination with a virtual work principle; the device can block earthquake energy transfer, the calculation method provides quantitative basis for design, and safe operation of the rotary hearth furnace in a high-intensity earthquake area is guaranteed.

The application relates to the technical field of industry, and discloses a wisdom industrial control collaborative control system and method, which comprises the following steps: obtaining initial attribute data of target batch material in a material supply end, the running speed and distance of a material transmission device, and real-time working condition data of a target reaction device at the current moment; inputting the above data into a space-time domain mapping model to calculate the transmission delay time of the target batch material to the target reaction device; inputting the initial attribute data into a digital twin model as a feedforward variable, combining the transmission delay time with the real-time working condition to generate virtual reaction working condition data after the delay time; when the virtual working condition data deviates from an index threshold, outputting a feedforward control instruction through a global collaborative control model to adjust the target reaction device after the delay time, and outputting a feedback intervention instruction to adjust the material supply and the transmission device. The application breaks through the limitation of traditional lag feedback, and realizes space-time accurate feedforward and bidirectional collaborative control.

The invention belongs to the technical field of anti-seismic reinforcement of building structures, and discloses a method for calculating lateral stiffness of an externally-attached energy dissipation frame reinforcement system based on a virtual work principle. The problem that in the prior art, a quick and reliable theoretical calculation method for quantizing contribution of the bending type damper to the lateral stiffness of the attached frame column is lacked is effectively solved. The method aims at a frame reinforcing system composed of an existing frame, an externally-attached frame and a bent metal damper connected to a beam-column joint of the externally-attached frame. The method comprises the following steps that (1) a damper rotating rigidity model is established and solved; (2) establishing an equivalent linear stiffness model of the reinforced combination column and solving the equivalent linear stiffness model; and (3) establishing and solving an overall frame lateral stiffness resistance model. The closed analysis method is clear in physical concept and simple in calculation, parameter design and structural scheme optimization of the damper can be efficiently guided, and the design efficiency is remarkably improved.

The invention discloses an electromechanical equipment simulation verification method based on a digital twinning technology, and the method comprises the steps: constructing a material scale model, a part scale model and a system scale model, and carrying out the three-level digital twinning modeling; the tensor product of the physical quantity gradient is defined, an energy weight factor is introduced for weighted summation, and a definition result of a gradient conservation tensor is obtained; constructing a conservation constraint condition according to a virtual power principle; and constructing a physical conformal modal space and a data driving compensation space, combining the physical conformal modal space and the data driving compensation space to generate a solution space, and according to a new working condition input selection solution strategy, solving multi-scale state prediction and physical response of the electromechanical equipment to obtain a simulation verification result. According to the invention, a material-part-system energy conservation cross-scale transmission mechanism is constructed, a physical constraint solver based on virtual work balance is developed, a physical conformal and data compensation bimodal solution space is integrated, and millisecond-level high-precision response is realized, so that the integration bottleneck of complex electromechanical equipment in a full life cycle is broken through.

This invention discloses a dynamic simulation method, system, computer, and storage medium for a space thin-film antenna system based on the absolute nodal coordinate method. The space thin-film antenna is simplified into a rigid-flexible coupled multibody system composed of a flexible support frame, a tensioned cable net, and a thin-film reflector. Nonlinear cable elements are introduced between the frame and the thin film as connections. The flexible frame and the non-bending stiffness thin film are divided into elements based on the absolute nodal coordinate method. According to the theory of continuum mechanics and the principle of virtual work, a dynamic model of the flexible frame-cable net-thin film coupled multibody system under pretension is established. A form-finding strategy for gentle slope loading is proposed. The generalized -α implicit time integration algorithm is used to solve the dynamic equations of this system, obtaining curves showing the displacement and vibration attenuation of the space thin-film antenna under impact disturbance as a function of time. This invention provides a new dynamic modeling model for large-scale space thin-film antenna systems and offers researchers in this field more comprehensive data and image data.

The application discloses a synchronous bidirectional coupling solving method for large deformation of a flexible slender beam under uniform pressure based on an accurate load stiffness matrix and relates to the field of computational mechanics. The method discretizes a beam structure through absolute node coordinate Euler-Bernoulli beam elements, constructs a local curvilinear coordinate system and a uniform pressure vector function, derives an external force vector of the element based on a virtual work principle, obtains an accurate load stiffness matrix through a vector-valued function differential rule, synchronously assembles the load stiffness matrix and an elastic tangent stiffness matrix in a Newton-Raphson iteration step, and realizes synchronous bidirectional coupling solving of load and configuration. The method breaks through the numerical loading limit of a traditional method, avoids error accumulation, improves calculation stability and precision, can accurately analyze large deformation and even post-buckling behavior of the flexible slender beam under uniform pressure, and is suitable for design optimization of related equipment in the fields of ocean engineering and mechanical engineering.