9 results about "Transient response analysis" patented technology

The invention relates to the technical field of motor control, in particular to a variable frequency motor dynamic adaptive control method and system based on multi-parameter analysis. The method comprises the following steps: collecting a multi-dimensional electrical operation monitoring parameter flow of a variable frequency motor, carrying out multi-parameter nonlinear correlation analysis and parameter topological correlation reconstruction, and constructing a multi-dimensional feature topological correlation network; a variable frequency motor multi-working-condition travel history database is obtained, multi-working-condition disturbance transient response analysis is carried out, multi-modal behavior prediction evolution is carried out based on the multi-dimensional feature topological association network, and a dynamic multi-modal behavior prediction engine is constructed; and acquiring multi-part electromagnetic sensing parameters of the motor, and performing abnormal electromagnetic intensity fluctuation detection and abnormal part power loss calculation to obtain abnormal part power loss characteristics. The self-adaptive real-time parameter motor control is realized, the energy efficiency of the motor is improved, the maintenance frequency and cost are reduced, and the full-life-cycle optimal control of the motor is realized.

The invention relates to the field of data visualization, in particular to a data visualization method and system for an intelligent automobile data recorder of an electric vehicle. The method comprises the following steps: acquiring a real-time video stream of a driving scene based on an intelligent automobile data recorder, performing motion visual jitter elimination compensation and multi-level scene target feature perception, and constructing a multi-level scene target information sequence; performing space-time connection rendering according to the multi-level scene target information sequence, and performing scene evolution smoothing processing so as to construct a dynamic driving scene topology rendering model; vehicle running state parameters are obtained, multi-parameter correlation analysis and vehicle transient response analysis are carried out, and a real-time vehicle state evaluation report is constructed; and performing multi-target constraint calculation based on the dynamic driving scene topology rendering model, and performing optimal vehicle speed prediction to obtain the optimal vehicle speed. According to the invention, through multi-dimensional driving visual rendering, good real-time feedback and behavior early warning are provided for the user.

The invention relates to the technical field of vapor-liquid two-phase cooling, and discloses a vapor-liquid two-phase cooling method and system based on phase change immersion. The method comprises the following steps: acquiring a multi-modal monitoring data set of a target cooling system; performing spatial gradient feature extraction, transient response analysis and motion mode analysis processing on the data to obtain a temperature field feature matrix, a thermal load fluctuation vector and a bubble dynamics feature sequence; performing multi-physical field coupling processing on the features to generate a fusion cooling state feature set; a pre-configured multi-phase flow simulation model is called to carry out cooling efficiency evaluation, and a cooling efficiency index set containing the correlation mapping relation between the working medium flow characteristics and the heat exchange efficiency is generated; performing collaborative anomaly traceability processing based on the mapping relationship, and generating a phase change anomaly traceability report for identifying an abnormal boiling region and a working medium flow defect mode; and generating a cooling parameter self-adaptive control strategy according to the traceability report, and sending the cooling parameter self-adaptive control strategy to a cooling control system to execute real-time parameter adjustment.

The invention provides a flow-induced vibration analysis method for a large top-exposed plane gate with high submerging water depth. The flow-induced vibration analysis method comprises the steps that a hydraulic parameter set and a gate structure parameter set corresponding to an ultrahigh submerging ratio submerging outflow working condition are obtained; constructing a three-dimensional fluid-structure interaction numerical model comprising a gate solid domain and a water flow fluid domain based on the hydraulic parameter set and the gate structure parameter set; calculating a pressure pulsation load component and a vortex-induced vibration load component distributed on the surface of the gate through the three-dimensional fluid-solid coupling numerical model; inputting the pressure pulsation load component and the vortex-induced vibration load component into a gate structure dynamics solver for transient response analysis, and outputting a gate vibration displacement distribution map and a key component dynamic stress data set; and generating a flow-induced vibration safety performance evaluation conclusion according to the vibration displacement distribution map and the key component dynamic stress data set. The operation reliability and safety of the large top-exposed plane gate under complex working conditions can be improved.

The invention discloses a reduced order modeling method for online state monitoring of a wind turbine generator blade, which comprises the following steps of: 1) constructing a kinetic equation of the wind turbine generator blade by using a central rigid body-flexible beam model, and dispersing the kinetic equation by using a finite element method to obtain a finite element model; (2) solving the finite element model obtained in the step (1) to obtain a displacement solution set of blade nodes, constructing a transformation matrix through the displacement solution set of the nodes, and performing order reduction on the finite element model obtained in the step (1) by using the transformation matrix to construct an order reduction model; 3) giving the geometric dimension of the wind turbine generator blade and the actual operation parameters of the wind turbine generator, respectively calculating the transverse displacement of the tail end of the blade by using the reduced order model and the finite element model, comparing the precision of the reduced order model with different reduced order numbers, and selecting a proper reduced order number; a calculation result shows that the calculation cost of transient response analysis is effectively reduced on the premise that the blade transient response calculation precision is guaranteed.

The invention belongs to the technical field of steel structure floor design, and particularly relates to a transient response analysis method for converting structural damping into equivalent viscous damping in a full frequency band, which comprises the following steps of: 1, establishing a finite element model of a structure, and outputting characteristic matrixes of the structure, including a stiffness matrix and a mass matrix; 2, performing modal analysis based on the finite element model of the structure to obtain a modal matrix of the structure; 3, calculating a generalized stiffness matrix and a generalized mass matrix of the structure based on the stiffness matrix, the mass matrix and the modal matrix; step 4, calculating viscous damping of each order vibration mode of the structure based on the generalized stiffness matrix; 5, calculating the transient response of each order vibration mode of the structure based on the generalized stiffness matrix, the generalized mass matrix and the viscous damping of each order vibration mode of the structure; and 6, converting the transient response of each order vibration mode of the structure to a physical coordinate to obtain the transient response of the structure at each moment.

A method for obtaining micro-vibration test conditions for aerospace vehicles involves: searching for micro-vibration disturbance sources during the vehicle's on-orbit operation; classifying the micro-vibration disturbance sources and identifying those that cannot be avoided; conducting micro-vibration environment measurement tests on the unavoidable disturbance sources to obtain the time-domain curve of the maximum vibration environment of the disturbance sources; establishing a finite element model for micro-vibration response analysis; conducting transient response analysis to determine the micro-vibration response of precision instruments; converting the time-domain curve of the micro-vibration response of the precision instruments into a frequency-domain curve and performing envelope design to obtain the micro-vibration test conditions of the precision instruments for subsequent experimental verification.

The invention provides a vibration response modeling and analysis method for a forward-backward swept and up-down reverse blade tip configuration helicopter. The method comprises the following steps: establishing system coordinate systems and a relationship between the coordinate systems; establishing a rotor blade structure dynamic model; establishing a rotor blade aerodynamic model; establishing dynamic and pneumatic models of the blade tip section; establishing a body structure dynamic model; establishing an airframe aerodynamic model; establishing a complex three-dimensional shape rotor wing and body coupling mode comprehensive model, and deducing a kinetic equation; discretizing finite elements of space coordinates of the blades in the kinetic equation; balancing analysis is carried out; solving vibration response by a time finite element method; and transient response analysis.

The present invention discloses a method for optimizing the scheduling and control of heliostat fields in a solar tower-type solar thermal power station, which relates to the field of solar thermal power generation technology and includes the following steps: continuously and synchronously acquiring the temperature distribution matrix and heat flux density matrix of the tower top receiver surface with a millisecond sampling period, respectively recording their continuous change processes in the time dimension, and forming a thermal characteristic input data set for transient response analysis. The present invention generates a transient thermal shock intensity index with predictive capabilities by constructing a joint characteristic sequence of temperature and heat flux, thereby realizing feedforward identification and adaptive regulation of thermal disturbances. The system can actively adjust the working fluid flow rate and heliostat focusing behavior before a thermal shock occurs, dynamically balance heat input and conduction capacity, effectively prevent faults such as overheating and overpressure, and improve the receiver life and the operating efficiency of the solar thermal power generation system.