18 results about "Energy method" patented technology

The application discloses a kind of wind turbine single blade installation process dynamic response analysis methods considering wind load action, comprising: according to the wind turbine blade installed and construction sea area, establish blade airfoil database and turbulent wind field database;When the position of lifting point and the position of tappet vertex are described, homogeneous transformation matrix is used to describe the motion of each mechanism of ship-mounted crane;When the position of lifting point is described, the position of tappet vertex is described, and the position of blade centroid in space is described by lifting point position, sling length and generalized coordinate;Wind load at each time point in the process of blade installation is obtained;The sling tension in the process of blade installation is obtained;The dynamics model of single blade installation system is established by using Lagrange method;The method can accurately analyze the coupling motion response between crane ship, ship-mounted crane, sling and blade in the installation process, and simultaneously by selecting generalized coordinate and modeling and analyzing the system based on energy method, the system modeling efficiency is effectively improved.

The invention relates to an engine component fatigue life evaluation method based on a structural simulation part, and belongs to the technical field of simulation data processing, and the method comprises the following steps: building a tensile strain energy life prediction model based on elastic strain energy and plastic strain energy, and predicting the fatigue life of a structural part based on the model; optimizing the design parameters of the simulation part of the engine component, manufacturing the simulation part based on the design parameters, performing a low-cycle fatigue test on the simulation part, and analyzing the fatigue life of the simulation part; comparing the fatigue life of the simulation part with the predicted fatigue life of the structural part, and if the requirements are not met, re-optimizing the design parameters of the simulation part; and if the requirement is met, outputting the fatigue life of the structural member. According to the method, the fatigue life of the simulation part is compared with the predicted fatigue life of the structural part, the model is further improved, a closed-loop research method is formed, the accuracy and efficiency of fatigue life prediction are improved, the limitation of a traditional hysteresis energy method is overcome, and the research cost and period are reduced.

The invention discloses a power system oscillation traceability analysis method and system based on multi-method probability fusion, which can effectively solve the problem of oscillation source positioning error caused by sparse measurement data and compressed sensing. Firstly, the oscillation source probability of each node is calculated through an oscillation energy method, a frequency spectrum characteristic method, a correlation analysis method, a voltage fluctuation method and a phase angle gradient method; secondly, calculating the adaptive weight of each method based on an information entropy theory, and completing multi-method probability fusion; the fusion probability is optimized in combination with a power grid topological structure, and an oscillation source candidate sequence is determined; and finally, a comprehensive probability distribution diagram and a detailed analysis report are output through a visual module, and reliable technical support is provided for safe and stable operation of a power system.

The present application relates to the field of tunnel engineering, and specifically discloses a method and system for fine prediction of rock burst grade in tunnel construction stage by drill and blast method, comprising the following steps: constructing a basic sample library; establishing a mapping relationship between drilling parameters and first principal stress, second principal stress, third principal stress, elastic modulus and Poisson's ratio and other surrounding rock mechanical parameters based on energy method; constructing an extended sample library based on the mapping relationship and the basic sample library; constructing an intelligent rock burst grade prediction model based on deep learning, and bringing the extended sample library into the intelligent rock burst grade prediction model for training; and fine prediction of rock burst grade in front of the tunnel face according to the constructed intelligent rock burst grade prediction model. The present application can effectively reduce the input of construction personnel and prevent the impact of rock burst on the safety of construction personnel, and guide the intelligent construction of tunnels.

The application provides a distributed line selection and positioning method, which synchronously and high-speed collects zero sequence voltage, zero sequence current and / or three-phase current on each power supply section, carries out zero sequence transient energy method and / or three-phase current transient correlation method analysis, determines a grounding line and positions a grounding fault section; each power supply section on the grounding line is differentially delayed and tripped by a power receiving end phase power supply end, when the fault section is tripped and the fault disappears, all power supply sections before the fault section stop timing, after the fault section isolation time reaches, the power supply of the fault section is restored through reclosing, if the fault is a transient fault, the power supply of the line on the fault section can be restored; if the fault is a permanent fault, the fault section is removed again through post-acceleration, and the permanent isolation of the fault is realized. The application realizes accurate positioning and reliable isolation of a single-phase grounding fault section, guarantees the reliability and safety of power supply, and improves the stability of power distribution network operation.

A phase control technology-based overvoltage suppression method, apparatus and device, and a storage medium, the method comprising: according to a preset iterative symplectic geometric mode decomposition-difference Hilbert transform model, obtaining transient characteristics from a collected voltage signal; determining a stable zero crossing point according to the transient characteristics; in a preset period of the stable zero crossing point, voltage values and current values at all moments before and after the stable zero crossing point are obtained; according to the voltage value and the current value at each moment before and after the stable zero crossing point, and a preset capacitance value and a preset inductance value, respectively calculating an energy sudden change value at each moment; and determining a minimum energy abrupt change value from the energy abrupt change values of the moments according to a minimum energy method, determining the moment corresponding to the minimum energy abrupt change value as a target moment, and controlling the switch to be switched on so as to suppress overvoltage, thereby solving the problems of large stable zero crossing point detection error, uncertain switch switching-on moment and poor stability in the prior art. And the overvoltage suppression effect is not good.

The invention relates to an electromagnetic transient modeling and simulation method for a direct-current isolating switch based on variable capacitance. The method comprises the following steps: step 1, simplifying a three-dimensional geometric model of the direct-current isolating switch; 2, setting material attributes and excitation of a conductor part in the three-dimensional geometric model according to the type of the capacitor to be solved; 3, calculating the distribution of a three-dimensional electric field and a three-dimensional magnetic field of the direct-current isolating switch at different operation moments according to the setting in the step 2 by adopting a finite element method; 4, calculating capacitance values under different solving objects and an equivalent inductance value when the switch is completely closed in finite element software by adopting an electric field energy method and a magnetic field energy method; and 5, performing curve fitting on the capacitance values at the plurality of operation moments calculated in the step 4 to obtain a function relational expression between the capacitance values and the operation time. And 6, carrying out simulation analysis on the electromagnetic transient model of the isolating switch, and verifying the accuracy and effectiveness of the model.

The application discloses a method and system for determining seismic energy and ground motion amplification coefficient under complex terrain geological conditions based on energy method and artificial intelligence, and belongs to the technical field of earthquake engineering and geotechnical engineering. The method comprises the following steps: determining the energy of a seismic source; calculating the energy attenuation on the seismic wave propagation path; calculating the energy transformation of different geological interfaces; extracting terrain feature parameters and constructing a training database to train a deep neural network to determine the energy distribution coefficient of a complex combined terrain; predicting the energy distribution coefficient of each point of a target site; combining the incident energy of bedrock to calculate the ground motion amplification coefficient and perform energy conservation correction; and finally outputting an amplification coefficient distribution map. The application combines physical mechanisms with artificial intelligence, can efficiently and accurately predict the ground motion amplification effect of complex combined terrains (such as mountain groups and valleys), and the result conforms to energy conservation, so that the application can provide a scientific basis for seismic zoning and engineering seismic design.

This invention discloses a method for calculating the damage and deformation of a compartment structure under an internal explosion, relating to the field of ship damage and protection technology. The method includes: calculating the local damage area formed by the shock wave load on each compartment wall structure during the explosion; calculating the quasi-static pressure load on the exploded compartment; calculating the maximum overall deflection of each compartment wall structure under the coupled action of the two loads based on the energy method; determining the degree of damage to each compartment wall structure; if overall damage to the wall structure occurs, calculating the quasi-static pressure load on the adjacent damaged compartments, and calculating the maximum overall deflection of each compartment wall structure under the quasi-static pressure load; re-performing the determination of the degree of damage to each compartment wall structure until the deformation and damage status of all compartments is obtained. This method comprehensively considers the coupled loading effect of the two loads on the compartment structure under implosion, enabling rapid and accurate assessment of the damage and deformation status of the compartment structure under an internal explosion.

The application discloses a state observer design method of a space tether system, a rigid body tether with a tensioning effect is used as the tether; firstly, a dynamics equation of the whole tether satellite system is established by using a Lagrange energy method; then, a criterion for the observability of the system is derived by using a linearization method when the velocity term state of the system is unobservable; and a nonlinear system state observer satisfying a linear observation convergence condition is further designed under the observability condition; the obtained observer can guarantee local asymptotic stability around a linearization point. The application can guarantee that the observation error converges in a dynamically changing neighborhood of an equilibrium point, and the application can be designed separately from a controller to realize the stability of the system.

The invention provides a method for optimizing the dynamic reliability of a dangerous resonance component of a permanent magnet electric drive gear transmission system, and the method comprises the following steps: building an electromechanical coupling dynamic model of the system, and recognizing a dangerous resonance rotating speed and a component through a Campbell diagram and a modal energy method; applying a rain flow counting method and a modified P-S-N curve to analyze the strength degradation of the component, and establishing a dynamic reliability evolution model of the component; and a two-stage nesting strategy of firstly optimizing motor PI parameters and then optimizing mechanical parameters is adopted to carry out parameter optimization on the components which do not meet the life reliability requirement. According to the method, rapid prediction and collaborative optimization of the dynamic reliability of the dangerous resonance component can be realized in the design stage, and repeated design and expensive tests caused by resonance in the later stage are avoided, so that the research and development cycle is shortened, and high reliability and long service life of the system in the whole life cycle are guaranteed.

The invention discloses a bending, twisting and buckling bearing method for duplex stainless steel cold-bent edge-rolled angle steel, and relates to the technical field of metal structure materials. The method comprises the four steps of material mechanical property parameter acquisition, bending-torsion coupling calculation model establishment, bending-torsion combination test verification and engineering design method output. Accurate parameters are acquired by testing material microstructures and mechanical properties under different cold bending processes; deriving a bending-torsion coupling equation based on an energy method, and establishing a calculation model in combination with a finite element method; designing a standardized bending torsion loading test device, and verifying and correcting the model; load conditions are classified, a design formula is simplified, and an engineering design process is formulated. According to the method, the problems of large calculation error and poor practicability in the prior art are solved, the calculation error of the bending-torsion-buckling critical load is reduced to 5% or below, the blank of design specifications is filled up, the method can be applied to the fields of buildings, oceans, chemical engineering and the like, material waste is reduced by 10%-15%, and remarkable technical, economic and social benefits are achieved.

The invention discloses a multi-direct-current power oscillation bearing capacity evaluation method based on an energy method and a physical information neural network, and the method comprises the steps: firstly, collecting the voltage and current of each node of a power system and the instantaneous values of related active power and reactive power at different oscillation frequencies, and forming time sequence data; secondly, the PINN model calculates energy flow conditions among nodes in the system through a physical constraint formula of an embedded augmented energy function; and finally, by analyzing the energy flow direction under the dominant frequency and positioning the position of the oscillation source, the oscillation source in the power system is positioned, and the multi-direct-current power oscillation bearing capacity is evaluated. By embedding the physical law of the power system into a physical information neural network (PINN), it is ensured that the model outputs fitting data and conforms to the law of the power system, the accuracy of multi-direct-current power oscillation bearing capacity evaluation is remarkably improved, the problem that internal physical behaviors of the system cannot be explained is avoided, and meanwhile the generalization ability and the real-time performance of the model are improved.

The invention provides a transmission system dynamics analysis method based on a finite element transfer matrix method, relates to the technical field of finite element analysis, and solves the technical problem that in the prior art, an energy method, a finite element method and the like are difficult to model for transmission assemblies with various types and complex structures. According to the scheme, the method comprises the steps of modeling based on transmission system component multi-physics field coupling, modeling of a component dynamic model based on a finite element-transfer matrix method, modeling of a transmission system dynamic model, quoting boundary conditions to a transmission system total dynamic transfer equation to obtain a characteristic frequency equation of a transmission system, and solving to obtain an analysis result. On the premise that the precision equivalent to that of a traditional FEM is kept, the calculation efficiency is improved by nearly 8000 times, and the method is more suitable for real-time simulation and system-level optimization of transmission system engineering.

Method for a vehicle comprising: - Determining a change in the square of the vehicle speed by a controller (12); - Comparing the change in the square of the vehicle speed with a first threshold value by the controller (12); - Determining a change in the vehicle's altitude by the controller (12); - Comparing the change in the vehicle's altitude with a second threshold value by the controller (12);if a positive change in the square of the vehicle speed is greater than the first threshold, and / or if a positive change in the vehicle altitude is greater than the second threshold: - Estimating a fuel conversion factor due to stored vehicle energy by the controller (12), wherein the conversion factor is determined by the controller (12) based on a difference between a fuel flow rate measured under steady-state driving conditions and a current fuel flow rate; - Compensating a measured fuel consumption value for changes in stored energy based on the estimated conversion factor by the controller (12) to obtain a compensated instantaneous fuel consumption value; and - Displaying the compensated instantaneous fuel consumption value to the driver of the vehicle.

The application discloses a perforating cable weak point failure calculation method based on an energy method, first, a reasonable assumption is made to a cable weak point-pipe column system based on engineering practice and a dynamic model is established; subsequently, a system energy balance equation is constructed, impact kinetic energy, cable weak point elastic energy and fluid damping energy consumption are calculated respectively; then, a cable weak point fracture criterion is established based on energy balance; finally, system energy response characteristics are obtained through numerical solution, and cable weak point failure risk assessment is completed. The application realizes accurate quantitative calculation of cable weak point failure under impact load generated by perforation, and provides reliable guarantee for safe design of perforation engineering.

The invention relates to the technical field of tunnel blasting, in particular to a surrounding rock three-dimensional strength cloud picture drawing method and a tunneling construction method. Comprising the steps that while-drilling data are collected, and while-drilling measurement system data generated when hole positions of all peripheral holes are drilled currently are collected; the drilling specific energy is calculated, and the energy needed by the drilling machine for drilling the unit volume of the rock under different depths of the hole positions of the peripheral holes is calculated according to the while-drilling data; drawing a three-dimensional intensity cloud picture, and performing continuous reconstruction on the space coordinates of the hole positions of the peripheral holes by using a triangulation algorithm; carrying out continuous treatment on the drilling specific energy intensity of each peripheral hole site under different depths by utilizing an interpolation method; and drawing a final three-dimensional intensity cloud picture of the tunnel surrounding rock for guiding the next blasting and drilling operation. According to the method, the measurement-while-drilling data generated by the drilling machine in the tunnel is utilized to form the tunnel surrounding rock energy method cloud picture which is used for indirectly evaluating the surrounding rock strength, guiding blasting construction, guaranteeing the construction safety of an engineering project and improving the construction efficiency of the engineering project.

The present application relates to a kind of ammunition danger assessment method, belong to the technical field of shell explosive. Including: the reaction intensity expression of constrained charge and its normalized function are constructed;Based on energy method, shell crushing energy, shell kinetic energy, air shock wave overpressure and its corresponding reaction degree are obtained, and terminal state reaction degree is obtained;Based on terminal state reaction degree and reaction time, maximum reaction rate is obtained;Based on terminal state reaction degree and maximum reaction rate, the reaction intensity of constrained charge and its normalized value are obtained;Based on the normalized value of the reaction intensity of constrained charge, the corresponding danger score of constrained charge under different IM accidental stimulation and the total score of danger are obtained.The method obtains the reaction intensity of constrained charge and its normalized value by establishing the reaction intensity expression of constrained charge, and obtains the corresponding danger score under different IM accidental stimulation and the total score of danger based on the normalized value, solves the problem of lacking the method for quantitatively evaluating the danger of ammunition under accidental stimulation.