27 results about "Transient kinetics" patented technology

The invention relates to the technical field of precision transmission, and discloses an impact resistance design method for a harmonic gear transmission mechanism, which is used for constructing an impact performance evaluation model by analyzing an impact force change rule in an engaging impact process. The method comprises the following steps: firstly, establishing a harmonic gear transmission impact model based on an improved kinematics method, calculating a contact force when a flexible gear is engaged with a rigid gear based on a Hertz contact theory and an elastic thin plate theory, solving a hysteresis damping coefficient in a collision process by combining a Hunt-Crossley hysteresis model with a damping coefficient and an energy conservation law, and calculating a harmonic gear transmission impact model according to the hysteresis damping coefficient. According to the method, a harmonic gear transmission collision process impact force model is established, an engaging-in impact force and impact duration conforming to a Hunt-Crossley hysteresis loop are obtained, an impact slow release index (IRI) is constructed, and the impact resistance of a harmonic gear transmission mechanism is evaluated. Through a transient dynamics analysis method, the accuracy of a theoretical impact model calculation method is verified. The method can effectively predict the shock resistance of the harmonic reducer, and provides a theoretical basis for the flexible gear profile design of the harmonic reducer.

The application discloses a grid-construction converter parallel system transient stability evaluation and enhancement method, and belongs to the technical field of power system transient stability evaluation; the evaluation method comprises the following steps: a differential-algebraic model of a hybrid system is established and is converted into a state space form, time variables are eliminated by performing quotient operation on equations to establish a time domain separation reduced-order model; a multivariable alternating iteration algorithm is used to solve implicit space trajectory integral equation groups, and a generalized transient kinetic energy is used to find a farthest point of a phase orbit, so that instantaneous generalized acceleration torque at the point is calculated to quantitatively evaluate transient stability margin of the system. The enhancement method comprises the following steps: a frequency deviation signal of a local phase-locked loop of the grid-construction converter is collected, and an active current reference value is dynamically reduced by a feedback controller to adjust output current. The application breaks through the order limitation of a traditional equal-area criterion, realizes accurate evaluation of a high-order hybrid system, and the control strategy can spontaneously reduce acceleration torque without station communication, thereby improving system synchronous stability.

The invention relates to a reaction cavity assembly for a diffuse reflection in-situ pool and a design method thereof, the reaction cavity assembly comprises an air inlet pipe, a dome upper cover and a reaction cavity which are connected in sequence, the reaction cavity is of a hemispherical shell structure made of a light-transmitting material, and the dome upper cover is of a flying saucer-shaped structure and comprises a circular ring part and a hollowed-out hemispherical shell with three hollowed-out areas. And the gas inlet pipe is axially and vertically arranged, so that reaction gas can axially and vertically enter a cavity formed by the diffuse reflection in-situ pool platform along the reaction cavity. Compared with the prior art, the gas flow field distribution uniformity is effectively improved through the axial gas inlet mode, the flow stagnation area and the large-scale vortex phenomenon caused by traditional lateral gas inlet are eliminated, gas flow is closer to the ideal plug flow state, and the accuracy of transient dynamic measurement is remarkably improved.

The application provides a length simulation calculation method for metal hoses for engines based on a finite element method, comprising the following steps: S1, importing a metal hose model into finite element software; S2, establishing a connection relationship between components; S3, calculating the maximum displacement of a servo actuator in the X direction under a follow-up coordinate system according to the maximum swing angle requirement of the engine; S4, setting the displacement-time load of the lower support point of the first servo actuator in the X direction under the first follow-up coordinate system, setting the displacement-time load of the lower support point of the second servo actuator in the X direction under the second follow-up coordinate system, and setting the total analysis step time; S5, performing transient dynamics analysis to simulate the maximum angle circle swing of the engine under the double servo actuators; and S6, observing the swing animation diagram according to the calculation result to analyze whether the length deformation of the metal hose is coordinated.

The invention discloses a starting noise control method and system of a hybrid electric vehicle and the hybrid electric vehicle, and relates to the technical field of vehicles. The method comprises the steps that relevant structure parameters of a hybrid engine are collected, and a thermodynamic simulation model of the hybrid engine is established and calibrated; different initial phase angles of the crankshaft are adjusted as input boundaries, and an engine cylinder pressure curve and torque fluctuation data are calculated; the method comprises the following steps: collecting parameter information of a hybrid engine, a dual mass flywheel and an all-in-one transmission, constructing a hybrid assembly dynamic model, and performing transient dynamic analysis and calibration to obtain a hybrid assembly transient dynamic model; adjusting the initial phase angle of the crankshaft, calculating the fluctuation of the output torque of the engine and the surface vibration amplitude of the junction surface of the gearbox to obtain the optimal initial phase angle, and calibrating and controlling the crankshaft to stop at the optimal initial phase angle when the hybrid engine flames out. The technical problem that in the prior art, when a hybrid engine is started, the abnormal sound phenomenon exists can be solved.

The invention relates to the field of structural design and impact dynamic modulation of sports equipment and handheld impact tools, and discloses an inertia-elasticity coupling modulation assembly based on controlled micrometric displacement and a dynamic regulation and control method thereof. The assembly can be embedded into an internal cavity of sports equipment or a tool and comprises a mass block, an elastic body or an elastic element, a limiting structure and an optional guide structure. The mass block generates controlled micro-displacement relative to the main body structure due to the inertia effect when high-speed impact or impact operation occurs to equipment or tools, and the elastic body or the elastic element is driven to deform in a controlled range and generate elastic restoring force, so that transient dynamic response of the impact process is participated in a millisecond-level time scale, and the impact force is generated. And the time distribution, the energy transfer mode and the transient stability of the structure of the impact force are modulated. Through the inertia-elasticity coupling modulation mechanism, on the premise that the original geometric structure and macroscopic mass distribution of equipment or tools are not obviously changed, the force output consistency in the impact process can be improved, transient torsion and local deformation sudden change caused by eccentric impact are restrained, and the impact strength of the equipment or tools is improved. And the stability and the fault tolerance of the equipment or the tool under the impact working condition are improved. The assembly has various structural forms and adjustable parameters, is suitable for handheld impact tools such as tennis rackets, badminton rackets, squash rackets, baseball bat, golf clubs, hammers, axes and the like, and has good universality and industrial application prospects.

The application relates to a kind of transient load under the function gradient porous structure of multiphase filling dynamics topology optimization method and system, belong to the topology optimization design field of function gradient porous structure.The technical problems to be solved by the application are: how to fully exploit design space, construct the efficient function gradient porous structure of multiphase filling dynamics topology optimization method, realize the optimal anti-vibration design of porous filling structure with high-quality transient dynamic performance.Technical points: based on characteristic orthogonal decomposition method, the reduced transient dynamic finite element equation of function gradient porous multiphase filling structure is constructed;the material interpolation model and volume constraint model of function gradient porous multiphase filling structure are constructed, and the transient dynamic multiphase filling topology optimization reduced model with the minimum dynamic compliance as the optimization objective is proposed;the reduced sensitivity time-domain accompanying equation is constructed, and the sensitivity of dynamic compliance and volume constraint is efficiently calculated;based on ADMM-MMA hybrid optimization algorithm, the optimal topology design of function gradient porous multiphase filling structure is efficiently solved and obtained.The application can maximize the optimal anti-vibration performance of function gradient porous filling structure, and is especially suitable for the structure lightweight anti-vibration design of large engineering equipment.

The embodiment of the invention provides an air compressor energy recovery control system and method, and relates to the technical field of air compressor energy recovery technologies. The method comprises the following steps: monitoring operation state parameters of the air compressor system in real time; on the basis of the operation state parameters, predictive perception is conducted on a shutdown event of the air compressor system, so that a shutdown preparation instruction is generated; and in response to the shutdown preparation instruction or the external shutdown instruction, executing regenerative braking and recovery operation of transient kinetic energy. According to the invention, the problem of energy waste of the air compressor is solved, so that the effect of improving the energy utilization efficiency is achieved.

This invention provides a pump-probe (TAP) instrument, relating to the fields of transient dynamics and catalytic interface research. The TAP instrument provided by this invention includes a sample introduction pulse system, a microreactor, a liquid nitrogen cooling system, a mass spectrometry system, and a vacuum system. Through the above-described configuration, this invention can realize experiments involving continuous or intermittent pulses (also known as pump-probe pulses) of one or two gas molecules, thereby obtaining surface chemistry and microdynamic information related to elementary steps.

The invention discloses a dynamic driving experience-driven electric vehicle acceleration process dynamics response quality optimization method, which comprises the following steps of: 1) designing a longitudinal vibration suppression controller based on model prediction, designing a dual-objective optimization function considering longitudinal vibration suppression and torque tracking, and verifying the performance of the controller through simulation; 2) obtaining an objective index set and a subjective score set of the acceleration process; 3) utilizing a machine learning method to construct a subjective and objective evaluation model of the transient dynamic response in the acceleration process of the pure electric vehicle; and 4) optimizing weight coefficient selection by using the subjective and objective evaluation model. The dynamic response quality optimization method for the acceleration process of the pure electric vehicle driven by dynamic driving experience is researched, the test cost can be reduced in the forward design process, and technical support is provided for developing high-performance electric vehicle products.

The invention discloses a gear dynamic response analysis and calculation method and device, equipment and a medium. The method comprises the steps that S1, excitation frequency which does not generate a beat vibration phenomenon is screened out from inherent frequencies, obtained through modal calculation, transient dynamics calculation and verification, of a gear to serve as final excitation frequency; s2, determining the number of partial teeth loaded by the gear according to the overlap ratio of the gear, and carrying out analog loading instead of full-tooth analog loading by utilizing the final excitation frequency and the determined number of partial teeth to obtain an excitation load curve; s3, determining a corresponding gear damping ratio according to the material characteristics of the aviation gear; and S4, performing dynamic response solution according to the final excitation frequency, the excitation load curve and the gear damping ratio to obtain a dynamic response result of the target position. According to the method, the calculation precision of the real dynamic response of the gear in the damping state is improved; the gear meshing loading process is simulated through cyclic loading on a small number of gear teeth, and the simulation efficiency and computer memory consumption are remarkably improved.

The invention provides a spectrum coupling system based on TAP, and relates to the field of transient dynamics and catalytic surface and interface catalysis research. The invention provides an expansion device based on the TAP on the first aspect, provides a Raman spectrum coupling system based on the TAP on the second aspect and provides a UV-Vis DRS spectrum coupling system based on the TAP on the third aspect. According to the invention, the TAP-based expansion device is coupled with the Raman spectrum device or the UV-Vis DRS spectrum device, so that the synchronous characterization of the structure and chemical properties of the active site / active component of the sample under in-situ and near working conditions can be realized.

The application provides a numerical control machine tool optimization design method and device, electronic equipment and storage medium, belongs to numerical control machine tool optimization design technical field, method includes constructing the dynamic model of numerical control machine tool, dynamic model includes numerical control machine tool main body, tool and workpiece;The transient dynamic characteristic analysis is carried out to the dynamic model, and the start-stop impact characteristic curve of the tool tip and the workpiece is obtained;According to the start-stop impact characteristic curve, whether the dynamic error curve of the tool tip relative to the workpiece satisfies the preset dynamic error index is judged, if not, the modal analysis is carried out to the numerical control machine tool main body according to the frequency domain characteristic curve of the start-stop impact characteristic curve, the weak link of the numerical control machine tool main body is determined and optimized, until the dynamic error index is satisfied.The dynamic error of numerical control machine tool is characterized by the dynamic error curve of tool tip relative to workpiece, the dynamic characteristics of numerical control machine tool can be more accurately evaluated, and high-precision machining of numerical control machine tool is ensured.

The invention discloses a fluid-structure interaction dynamics simulation analysis method of a nuclear reactor control rod drive line under a multi-point excitation load. The method comprises the following steps: firstly, obtaining a fluid resistance rule in a control rod falling process in advance through fluid simulation and fitting a quantitative relation; secondly, simulating incomplete elastic collision and friction between the control rod and the guide structure by adopting a contact model based on a lubrication theory; and finally, on the basis of commercial finite element software, in each step of transient dynamic analysis, calculating and applying corresponding fluid force according to the real-time motion state of the control rod to realize fluid-structure interaction simulation, and supporting an explicit time integration algorithm and an implicit time integration algorithm. According to the method, the rod dropping process can be completely and accurately simulated, the simulation process is standardized, the use complexity is reduced, and an efficient and reliable virtual experiment means is provided for safety design and performance optimization of the control rod drive wire.

The application provides a high-speed high advance ratio rotor transient dynamics analysis method, the method comprises the following steps: establishing a variable speed transient process dynamics equation, wherein the variable speed transient process dynamics equation comprises a system kinetic energy term; two coordinate systems are established, and the system kinetic energy term is derived based on the coordinate systems to obtain a system kinetic energy equation; a transient aeroelastic analysis model is established based on the system kinetic energy equation; variable speed transient dynamics analysis is carried out based on the transient aeroelastic analysis model to obtain transient aeroelastic response results; meanwhile, the application also provides a high-speed high advance ratio rotor transient dynamics analysis device; the application develops a high-speed high advance ratio rotor transient dynamics calculation method, studies the transient aeroelastic behavior characteristics in the variable speed process, and provides a theoretical basis and technical support for the development of high-speed high advance ratio rotors.

The invention relates to a fatigue damage tolerance evaluation method for a spaceflight power component in a vibration environment. The method is mainly used for solving the technical problem that the residual service life of a typical component of a spaceflight power system in a complex vibration load environment is difficult to accurately predict by an existing life prediction method. The method comprises the following steps: modeling a to-be-evaluated component and an initial crack on the to-be-evaluated component, performing transient dynamic analysis on a finite element model to obtain dynamic stress-time history data of the crack, and calculating the dynamic stress-time history data by adopting a stress extrapolation method to obtain stress intensity factor K-time history data of the crack; the time-domain variable-amplitude load is introduced into fracture mechanical modeling. And performing cyclic statistical processing on the stress intensity factor K-time history data by adopting a rain flow counting method to obtain a three-variable rain flow matrix of a stress intensity factor range delta K-cyclic ratio R-cyclic index n, and performing high-precision prediction on the residual life of the to-be-evaluated component.

The application provides a tire transient instability processing method and device and a storage medium, relates to the tire vibration analysis technical field, and comprises the following steps: acquiring driving condition data of a tire, wherein the driving condition data comprises a rolling angular velocity, a vertical load and a dynamic unbalance eccentric moment; inputting the rolling angular velocity and the vertical load into a transient dynamics model to obtain a dynamic unbalance eccentric moment threshold value of tire transient instability, wherein the transient dynamics model is used for reflecting the corresponding relationship between the rolling angular velocity and the vertical load and the dynamic unbalance eccentric moment threshold value; and determining that the tire transient instability occurs when the dynamic unbalance eccentric moment is greater than or equal to the dynamic unbalance eccentric moment threshold value. According to the real-time driving condition data of the tire, the dynamic unbalance eccentric moment threshold value of tire transient instability is obtained through the transient dynamics model, the influence of the driving condition and the vertical load of the tire on the transient dynamics behavior of the tire is fully considered, the threshold value determination result is more accurate, and the safety and stability of the vehicle can be significantly improved.

The application relates to the technical field of vehicle body endurance simulation analysis, and discloses a part fatigue analysis method and device based on a whole vehicle road spectrum and a storage medium, wherein the method comprises the following steps: acquiring a vehicle body model and collecting a road spectrum response signal of a whole vehicle on a test field; processing the road spectrum response signal and obtaining force value signals of a plurality of vehicle body and chassis connecting points; inputting the force value signals into the vehicle body model, so as to perform transient dynamics simulation analysis on the vehicle body, and obtaining a first analysis result, wherein the first analysis result comprises a target part signal; inputting the target part signal into a target part, so as to analyze the target part, and obtaining a first signal of a function representing stress or modal coordinates on the target part changing with time; inputting the first signal into fatigue analysis software, so as to obtain a fatigue result of the target part; and judging whether the target part needs to be optimized based on the fatigue result.

The application discloses a gear dynamic response analysis calculation method, device, equipment and medium, the method comprises the steps that S1, the gear inherent frequency obtained from modal calculation, transient dynamics calculation and checking is screened out as the final excitation frequency which does not produce beat vibration phenomenon;S2, according to the coincidence degree of gear, the part of tooth number of gear loading is determined, the final excitation frequency, the determined part of tooth number is used to simulate loading to replace full tooth simulation loading to obtain excitation load curve;S3, according to the material characteristics of aviation gear, the corresponding gear damping ratio is determined;S4, according to the final excitation frequency, excitation load curve and gear damping ratio, dynamic response is solved, and the dynamic response result of target position is obtained.The application improves the calculation precision of the real dynamic response of gear in the calculation of damping state;Through the cyclic loading on a small amount of teeth, the meshing loaded process of gear is simulated, and the simulation efficiency and computer memory consumption are significantly improved.

The invention relates to a mechanism and AI hybrid modeling and optimization method applied to petrochemical pipeline vibration reduction, and the method comprises the following steps: S1, obtaining the detail features of a pipeline system based on a pipeline engineering drawing, constructing a flowing CFD model, and obtaining the transient pressure change process of the inner wall surface of a pipeline; s2, constructing a structure simulation model of the pipeline, and performing modal analysis and transient dynamic solution on a pipeline system to obtain a vibration characteristic response of the pipeline structure; s3, constructing a regression prediction model based on a neural network, adjusting simulation boundary parameters, defining boundary parameter characteristic variables, and obtaining pipeline boundary condition characteristic parameters meeting error range requirements through prediction of the regression prediction model and benchmarking with measured values; and S4, simulation is carried out based on the adjusted pipeline boundary condition characteristic parameters, fluid-solid coupling analysis is carried out, and an optimal vibration reduction scheme is generated by adjusting five mechanism factors. According to the method, the appropriate pipeline vibration reduction optimization scheme and the vibration reduction optimization effect can be rapidly determined.

The invention belongs to the technical field of in-situ infrared spectrum characterization, and discloses a steady-state isotope transient kinetic analysis technology and infrared spectrum technology combined in-situ reaction tank, which comprises a reaction tank main body, a sample bracket and an accessory, due to the design of the sample bracket, gas enters the sample chamber from the gas inlet, is in contact with a sample immediately and then flows out from the gas outlet, so that the problem of gas vortex backmixing is solved; and the thermocouple is inserted into the sample bracket to be in close contact with the sample, so that the temperature of the sample is controlled at high precision, and the problems of large temperature gradient and slow time response are solved. The design of a single-side double-window-sheet structure is adopted, the inner-layer window sheet is close to the sample chamber to reduce dead volume, and the inner-layer window sheet is arranged in a heating area; the outer-layer window sheet is arranged in the cooling area so as to protect the in-situ reaction tank from being damaged by high temperature. The in-situ reaction tank provided by the invention can realize dynamic detection of species and products thereof on the surface of the catalyst under a steady-state condition by being combined with a steady-state isotope transient kinetic analysis technology and an infrared spectrum technology.

The present invention discloses a method, device, and medium for identifying faults in a closed-structure reactor shielded pump, comprising: establishing a guide bearing model for the reactor shielded pump; obtaining the bearing capacity at a specific position and speed based on the guide bearing model; establishing a rotor dynamics model, dynamically coupling the rotor dynamics model with the guide bearing model to obtain a rotor-bearing coupled dynamics model, and obtaining first nonlinear transient dynamic response data of the system; loading a fault excitation into the rotor-bearing coupled dynamics model to obtain second nonlinear transient dynamic response data; establishing a pump casing transient dynamics model, loading the second nonlinear transient dynamic response data into the pump casing transient dynamics model to calculate third nonlinear transient dynamic response data; and further employing an artificial intelligence algorithm for fault pattern identification. The present invention can obtain effective fault data and improves the accuracy and efficiency of fault identification.

The present application relates to a kind of virtual impact test method of paint coating of suspension launching device, and particularly to a kind of virtual impact test method of paint coating of suspension launching device.The measurement range of experimental table is relatively narrow, the error of test result is greater, and the production cycle of paint coating is longer.The present application obtains the relationship of pit depth x about punch initial velocity V using transient dynamics theory and finite element simulation, and obtains the equation of pit depth x about punch initial velocity V by fitting;Build the impact test physical platform of paint coating of suspension launching device, obtain the pit depth x of paint coating when drop hammer falls from different height H, and obtain the equation of pit depth x about drop hammer height H by fitting;According to the analytical expression of punch initial velocity v about drop hammer height H, calculate the punch initial velocity under different height conditions, obtain the pit depth and residual stress under different height conditions;According to criterion, evaluate the strength of paint film.The confidence of impact strength of paint coating of suspension launching device is improved, the experimental period is shortened, and the experimental efficiency is improved.

The application discloses a kind of electromechanical coupling variable position gear stiffness and transient dynamics calculation method, and its specific steps are as follows: (1) establish small modulus variable position gear tooth profile equation;(2) according to tooth profile equation, calculate healthy variable position gear stiffness using material potential energy method;(3) determine crack position and crack form according to the size of dedendum circle and base circle;(4) crack form is substituted into potential energy method calculation formula;(5) establish electromechanical coupling dynamics model under transient operating condition, put healthy gear and crack gear into dynamics, solve vibration displacement;Beneficial effect is to consider the influence mechanism of base circle and graduation circle size on time-varying mesh stiffness, establish small modulus variable position gear time-varying mesh stiffness calculation method, improve the time-varying mesh stiffness calculation precision, improve the accuracy of dynamics analysis.

The invention provides an analysis method for flow-induced vibration of spiral cross-shaped fuel rods, which comprises the following steps of: establishing a three-dimensional geometric model of a fluid domain by enlarging the distance between rods so as to eliminate the influence of self-supporting contact on grids, and carrying out grid division by adopting an unstructured grid and boundary layer optimization strategy; capturing a transient turbulence pulsating pressure field based on a WALE sub-grid model of a large eddy simulation model; solid domain modeling keeps the original position of a fuel rod and explicitly defines a contact pair, and the contact force is calculated in real time according to a penalty function method; the fluid time-varying pressure load is mapped to the solid surface to execute transient dynamic calculation, and vibration displacement response and contact force time history data are synchronously output; the vibration dominant frequency is extracted through frequency domain power spectrum analysis, and the resonance risk is compared and evaluated by combining the wet mode inherent frequency. According to the method, co-simulation of fluid domain gap processing and solid domain real contact dynamics can be achieved, and an analysis means is provided for prediction of flow-induced vibration and fretting wear of the spiral cross-shaped fuel rod.

The invention belongs to the technical field of battery structure design. The invention provides a fluid-solid coupling simulation analysis method for mechanical properties of a flexible storage type lithium battery. According to the embodiment of the invention, the dynamic interaction between the fluid and the flexible wave-shaped battery structure can be accurately simulated by introducing a complete bidirectional fluid-solid coupling theory and transient solution according to the mechanical characteristics in the bending process of the battery, and meanwhile, transient dynamic behaviors, such as flow-induced vibration and dynamic deformation, of the battery under the fluid load can be captured, so that the bending performance of the battery is improved. Therefore, the possible resonance risk and fatigue damage position can be predicted; through parameterized geometric modeling and effective homogenization material definition, the macromechanical characteristics of the multi-layer composite battery structure are accurately represented, and the accuracy of the model and the economical efficiency of calculation are both achieved.

This invention relates to the field of polymer material additives and discloses a method for modifying TPU film components to improve weather resistance. The method includes: coating the surface of nano-zinc oxide powder with a molten hindered amine light stabilizer in a high-pressure frictional flow field to form a core-shell structured composite preform; introducing the preform into a gradient thermal evolution field of a polyurethane base material; using transient kinetic energy generated by pulsed alternating shear force to peel off the shell of the preform; inducing in-situ hydrogen bonding between the exposed active crystal faces of the nano-zinc oxide powder and the hard segment polar groups of the molten polyurethane base material to form anchoring units; and inducing transient phase separation in the hard segment micro-regions by adjusting the temperature difference and locking the anchoring units at the phase interface. This invention eliminates the physical path of spontaneous migration of non-polymer organic matter to the film surface by constructing anchoring units with chemical affinity.