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206 results about "Stiffness coefficient" patented technology
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Stiffness coefficient. [′stif·nəs ‚kō·i‚fish·ənt] (mechanics) The ratio of the force acting on a linear mechanical system, such as a spring, to its displacement from equilibrium.
Method and system for analyzing and designing floating type wind power foundation structure
The invention discloses an analysis and design method and system for a floating type wind power foundation structure, and the method comprises the steps: selecting a part of section according to a preliminary design scheme of a floating type wind power foundation, and dividing the section into a plurality of floating body subareas; performing multi-body frequency domain hydrodynamic analysis on the floating body partition to obtain a multi-body hydrodynamic coefficient; calculating a rigidity coefficient at a part of the cross section; a wind turbine generator, a tower drum, a mooring system and the floating type wind power foundation are built into a multi-body coupling model, floating type wind power system time domain coupling analysis is conducted, internal force and stress of part of sections are calculated, the strength of the part of sections is checked, and the design scheme of the floating type wind power foundation is determined. According to the method, on the basis of floating body partition of the floating type foundation, the floating type foundation serves as a multi-body system composed of the multiple rigid bodies, the internal force at the connecting cross section of the multiple rigid bodies is obtained during time domain coupling analysis, analysis and design of the floating type wind power foundation structure are improved, and the design precision and the safety coefficient of the floating type wind power foundation structure are improved.
Owner:华能烟台新能源有限公司 +3
Constant force control method and system for multi-joint flexible mechanical arm
The invention discloses a constant force control method and system for a multi-joint flexible mechanical arm, and belongs to the technical field of robots. The method specifically comprises the steps that through a force sensor installed at the tail end of the flexible mechanical arm, the difference value of contact force between the tail end of the flexible mechanical arm and the environment and expected force serves as a force error, and the difference value of the change rates of the contact force and the expected force serves as the force error change rate; calculating a damping coefficient and a corresponding stiffness coefficient variable quantity; an impedance control model is constructed and solved, and an expected trajectory of the flexible mechanical arm is obtained; obtaining a track deviation and a speed deviation; a fast terminal sliding mode controller is constructed, and a control law is solved in combination with an extended state observer; and carrying out driving control on the flexible mechanical arm by utilizing the obtained control law to realize constant force control on the tail end of the flexible mechanical arm. According to the invention, the response speed of the system and the stability of the transition process are ensured, the problem of impedance coefficient selection is solved, automatic adjustment can be carried out according to real-time information, and the control precision, the response speed and the anti-interference capability are improved.
Owner:STATE GRID LIAONING ELECTRIC POWER CO LTD +1
Spiral bevel gear system dynamics modeling method based on bidirectional fluid-solid coupling
The invention relates to a spiral bevel gear system dynamics modeling method based on bidirectional fluid-solid coupling, and belongs to the technical field of aviation transmission, and the method comprises the following steps: S1, calculating the radial deformation and deformation speed of an elastic ring through an analytical method; s2, solving a transient control equation of oil film pressure by taking the radial deformation and the deformation speed of the elastic ring calculated in the step S1 as input to obtain ERSFD internal and external oil film pressure distribution; obtaining a rigidity coefficient and a damping coefficient of the oil film through numerical integration; s3, establishing a kinetic model of the spiral bevel gear transmission system by adopting a lumped parameter method, and deducing a differential equation of the gear system; and S4, through the ERSFD oil film dynamic characteristics calculated in the S2, internal excitation and external excitation are comprehensively considered, an ERSFD-spiral bevel gear system coupling dynamic response result is obtained, the modeling method considers the influence of the elastic ring boss structure characteristics and the complex coupling relation oil film-elastic ring current-solid coupling effect, and the accuracy and calculation efficiency of the model are improved to the maximum extent.
Owner:CHONGQING UNIV +1
Test identification method and apparatus for vibration-involved dynamic parameters of bearing pedestal and using additional masses
PCT designated stage expiredWO2025077362A1Machine part testingDesign optimisation/simulationStiffness coefficientFrequency spectrum
Provided in the present invention application is a test identification method and apparatus for vibration-involved dynamic parameters of a bearing pedestal and using additional masses. The method comprises: simplifying a dynamic model of a bearing pedestal into a single-degree-of-freedom system; applying an excitation force to the bearing pedestal, testing a response, plotting a frequency spectrogram, and obtaining a resonance frequency; adding additional masses to the bearing pedestal, and testing inherent frequencies under different additional masses; calculating vibration-involved masses on the basis of test results; plotting a curve of the vibration-involved masses changing with the additional masses, performing fitting by using the least-squares method, and performing extrapolation, so as to obtain a vibration-involved mass for when the additional mass is 0 and use same as a vibration-involved mass of the bearing pedestal; adding additional masses to the bearing pedestal, and testing damped vibration responses under different additional masses, so as to obtain logarithmic decrements and damping factors; plotting a curve of the damping factors changing with the additional masses, obtaining a damping factor in the same manner to use as a damping factor of the bearing pedestal, and performing calculation on the basis of the damping factor and the mass to obtain a vibration-involved stiffness coefficient of the bearing pedestal. The present invention using the solution can realize accurate identification of vibration-involved dynamic parameters of a bearing pedestal.
Owner:XIAN THERMAL POWER RES INST CO LTD
On-line automatic test method for compressive capacity of corrugated carton
ActiveCN120275174AMaterial analysis using acoustic emission techniquesMaterial strength using tensile/compressive forcesSensor arrayStiffness coefficient
The invention provides an on-line automatic test method for the compressive capacity of a corrugated carton, and belongs to the technical field of corrugated carton production. A micro-deformation loading system is constructed to apply a test load which does not exceed 10% of the expected maximum bearing capacity, and a laser displacement sensor array is adopted to measure micro-deformation displacement data of six surfaces of the carton; and synchronously acquiring acoustic emission signals and extracting spectrum characteristic parameters. Micro-deformation data is analyzed based on a carton fiber structure physical mechanism model, stress field distribution is calculated, analysis is carried out in combination with a hierarchical attention carton strength evaluation model, a rigidity coefficient is calculated and compared with a reference threshold value, a structural weak area is identified through a strain energy distribution diagram, and a damage risk index is quantified. And comprehensively evaluating the compressive strength prediction value and the confidence interval of the corrugated carton, and outputting a prediction result, thereby realizing accurate evaluation of the compressive strength of the corrugated carton under a non-destructive condition.
Owner:ANHUI HUAYI PRINTING & PACKAGING CO LTD
Testing platform and testing method for dynamic stiffness and dynamic damping of ship water lubricated bearing
ActiveCN119666363AMachine bearings testingElasticity measurementStiffness coefficientDynamic stiffness
The invention relates to the technical field of ship water lubricated shaft testing, in particular to a dynamic stiffness and dynamic damping testing platform and method for a ship large-length-diameter-ratio water lubricated bearing in an unbalance loading operation state. Through cooperation of the rotor-bearing system, the driving system, the loading system, the lubrication system and the test system, different radial specific pressures can be flexibly and conveniently applied to two sides of the water-lubricated bearing so as to simulate various unbalanced motion working conditions of the rotor-bearing system, and the test platform is simple to operate, small in installation error, high in measurement precision and high in reliability. The dynamic characteristics of the water lubricated bearing can be accurately identified; the dynamic equation of the bearing system and the mechanical model of the bearing connecting part are established, the displacement impedance method is combined, the comprehensive rigidity coefficient and the damping coefficient of the liquid film and the structure of the water lubricated bearing can be accurately measured, and the testing method is short in calculation time, high in measurement efficiency and wide in application range.
Owner:CHINA SHIP DEV & DESIGN CENT
Aircraft thin-wall structure optimization design method and related device
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI +1
High-precision load control method and system for aircraft tire test
ActiveCN119618521Aavoid damageAccurate fitMachine part testingSustainable transportationAviationStiffness coefficient
The invention relates to the field of aircraft tire tests, in particular to a high-precision load control method and system for an aircraft tire in a simulated take-off test, and aims to solve the problem of poor control precision of a large-inertia and high-frequency-response dynamic load. According to the invention, a loading force and deformation displacement double-quantity feed-forward closed-loop control mode is adopted to realize load control. The core of the method is that the dynamic stiffness of the aircraft tire is calculated by utilizing a force and a displacement value which are measured in real time in a test, a stiffness coefficient is used for adjusting a feedforward parameter in real time, and a first candidate displacement amount is calculated through a target load and the stiffness coefficient; in addition, the second candidate displacement amount is calculated by using the number set in the section with the high target load change rate. And finally, selecting the first candidate displacement or the second candidate displacement according to the actual situation to execute the action. In the face of a complex load curve, the high-precision control task of the load curve can be effectively completed.
Owner:CHONGQING CAERI AUTOMOBILE TEST EQUIP DEV +1
Accurate calculation method for horizontal bearing capacity of offshore wind power foundation
The invention belongs to the technical field of calculation of horizontal bearing capacity of foundations, and particularly discloses and provides an accurate calculation method for horizontal bearing capacity of an offshore wind power foundation, which comprises the following steps: integrating wave spectrum, wind regime, tide and soil mass parameters to form a multi-dimensional data set; a three-dimensional pile-soil model is constructed, and wave force and wind load are coupled; calculating a stiffness coefficient and identifying a pile body type in combination with a length-diameter ratio; quantifying an environment deviation compensation coefficient according to the pile body type; after the initial horizontal bearing capacity is calculated, the bearing capacity failure critical state is judged based on real-time displacement monitoring data, and if the critical state is reached, the initial bearing capacity is corrected through linear weighting of the displacement deviation compensation coefficient and the environment deviation compensation coefficient. According to the method, the time-varying environment load is dynamically coupled, the pile-soil interaction is finely simulated, a rigidity self-adaptive grading mechanism and a double compensation feedback system are established, and the calculation precision and the real-time early warning capability of the horizontal bearing capacity in the complex marine environment are remarkably improved.
Owner:CHINESE CLASSIFICATION SOC
Relay
ActiveCN119626846Areliable closurehigh contact pressureElectromagnetic relay detailsContact engagementsStiffness coefficientStructural engineering
The invention discloses a relay which comprises a push rod assembly, a movable spring assembly and an elastic assembly. The movable spring assembly comprises a movable spring sheet, the elastic assembly is connected to the movable spring assembly and the push rod assembly, and the elastic assembly is used for providing contact pressure for the movable spring sheet; in the over-travel process, the push rod assembly extrudes the elastic assembly, and the push rod assembly has an over-travel initial position, an over-travel end position and a transition position between the over-travel initial position and the over-travel end position relative to the position of the movable contact spring. In the process that the push rod assembly moves from the over-travel initial position to the transition position, the elastic assembly has a first stiffness coefficient; in the process that the push rod assembly moves from the transition position to the over-travel ending position, the elastic assembly has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.
Owner:XIAMEN HONGFA ELECTRIC POWER CONTROLS CO LTD
Robot force and position hybrid control method and device based on Gaussian process regression
The invention belongs to the technical field of robot motion control, and discloses a robot force-position hybrid control method and device based on Gaussian process regression, and the method comprises the steps: constructing a Gaussian process regression model of a stiffness coefficient; inputting the speed obtained in real time, the position error of the robot tail end and the contact force error between the robot tail end and the environment into the trained Gaussian process regression model; taking a rigidity coefficient output by the Gaussian process regression model as an optimization reference value, constructing a convex optimization problem, and solving the convex optimization problem to obtain an optimized rigidity coefficient; and in combination with an impedance control model of the robot, according to the optimized rigidity coefficient, the expected position of the tail end of the robot and the expected contact force between the tail end of the robot and the environment are obtained, and constant contact force control over the tail end of the robot in the operation process is achieved. Impedance parameters are dynamically adjusted according to environment feedback, and the precision of robot tail end contact force control is improved.
Owner:ZHEJIANG UNIV OF TECH
Robust adaptive variable admittance control method based on different intentions in feature space
The invention relates to a robust adaptive variable admittance control method based on different intentions in a feature space. The method comprises the following steps: determining a mapping relation between an actual contact force and a virtual contact force by adopting a mechanical arm kinematics and dynamics model; determining an adaptive stiffness coefficient based on the actual contact force change, and determining a robust adaptive virtual damping coefficient based on direct intention based on the virtual motion speed of the feature point; adjusting the robust adaptive virtual damping coefficient based on the expected contact force of the adjustment robot, and determining an admittance control virtual damping coefficient based on direct and indirect intentions; based on the mapping relation, the adaptive stiffness coefficient and the admittance control virtual damping coefficient, determining robust adaptive variable admittance control based on human intention in the feature space; and a robot image visual servo control law is determined based on the real-time image feature points and the expected feature points, the real-time joint speed of the mechanical arm is obtained, and the mechanical arm is controlled to move.
Owner:SOUTHWEST JIAOTONG UNIV
Centrifugal pump shafting critical speed calculation method
ActiveCN116050213BDesign optimisation/simulationSpecial data processing applicationsStiffness coefficientModal analysis
The application discloses a kind of centrifugal pump shafting critical speed calculation method, including the finite element calculation of radial roller bearing and thrust roller bearing stiffness coefficient curve, the prestressed modal analysis and critical speed calculation of centrifugal pump shafting considering different bearing stiffness coefficient.The setting of constraint condition of this method is in line with actual situation, which can realize the accurate calculation of centrifugal pump shafting critical speed, and help to improve the reliability of safety check of centrifugal pump shafting in design stage, at the same time, the calculation steps are simple, and the engineering application range is wide.
Owner:NAT ENG RES CENT OF DREDGING TECH & EQUIP
Variable stiffness spring simulation design method for high-pressure common rail pump
The invention relates to the technical field of diesel engine fuel supply, in particular to a variable stiffness spring simulation design method for a high-pressure common rail pump. Comprising the steps of establishing a multi-physics field coupling model based on simulation software; establishing a thermodynamic module; simulating the movement of the plunger; simulating the movement of the valve core; establishing a fuel pressure dynamic change model; calculating the spring stiffness; calculating a target adjustment parameter; optimizing a spring stiffness coefficient: adjusting the spring stiffness coefficient through a genetic algorithm; a population is set and initialized, then an operation method is selected, crossover operation is carried out, and filial generation individual data is obtained; outputting an optimal parameter; optimal target parameters are calculated, specifically, the optimal parameters are introduced into simulation software, so that the maximum collision speed V of the valve element is reduced, and the system volume efficiency L is improved; by using the variable stiffness spring, the collision speed can be effectively reduced, the impact stress between the valve element and the valve seat is reduced, the fatigue damage between the valve element assemblies is reduced, and the service life of the pump valve assembly of the high-pressure common rail pump is prolonged.
Owner:NAVAL UNIV OF ENG PLA
Method and system for predicting inherent frequency of conical plate made of three-phase functionally graded composite material
ActiveCN121617522ASustainable transportationDesign optimisation/simulationStiffness coefficientStructural dynamics
The invention relates to the technical field of composite material structure dynamics analysis, and provides a method and system for predicting the inherent frequency of a three-phase functionally graded composite material conical plate, and the method comprises the steps: employing an improved Halpin-Tsai model to calculate the equivalent parameters of a GPL-containing two-phase composite matrix, solving the equivalent parameters of a three-phase composite layer, and calculating the inherent frequency of the three-phase composite material conical plate. The method comprises the following steps: constructing a nonlinear geometrical relationship between a displacement field and a strain field, calculating a stiffness coefficient of each layer, constructing kinetic energy of the three-phase composite material conical plate, calculating an energy coefficient according to the stiffness coefficient of each layer, constructing potential energy of the conical plate according to the energy coefficient, and constructing a modal displacement function by adopting a Chebyshev polynomial and a boundary function. And establishing a characteristic equation based on a minimum potential energy principle and solving to obtain the inherent frequency of the three-phase composite material conical plate. According to the method, efficient calculation of the inherent frequency of the three-phase composite material conical plate is achieved, and the reliability and engineering application value of structural dynamics analysis are remarkably improved.
Owner:TIANJIN POLYTECHNIC UNIV
Control model construction method based on intelligent suspension system
The invention relates to the technical field of model construction, and discloses a control model construction method based on an intelligent suspension system, which comprises the steps of data acquisition, feature extraction, control parameter analysis, control model construction and suspension system control. According to the method, key data such as vehicle body vertical acceleration and wheel vertical displacement are accurately collected, feature extraction and control parameter analysis are combined, accurate calculation of the damping coefficient and the spring stiffness coefficient of the suspension system is achieved, and a basis is provided for real-time control; mutual relations among parameters of the suspension system, such as correlation between a stress value and a damping coefficient and correlation between wheel vertical displacement and a spring stiffness coefficient, are comprehensively considered, so that the control is more scientific and reasonable; a kinetic equation is constructed according to the mechanics principle, data and parameters are substituted into the equation to determine an adjustment coefficient, and a solid theoretical basis is provided for control; the suspension system can be dynamically adjusted in real time according to road conditions, the driving comfort and safety are improved, and the intelligent development requirement of modern automobiles is met.
Owner:SUZHOU AUTOMOBILE RES INST OF TSINGHUA UNIV (WUJIANG) +1
Die cutting equipment error optimization method and system based on group collaboration
InactiveCN121143230AMechanical oscillations controlMetal working apparatusStiffness coefficientControl signal
The invention provides a die cutting equipment error optimization method and system based on group collaboration, and relates to the technical field of die cutting machines, and the method comprises the steps: carrying out the spectrum analysis of a frequency characteristic curve of each piece of die cutting equipment, so as to divide an initial interference group; establishing a virtual spring damping network in the initial interference group, regarding each die cutting device in the initial interference group as a mass point, and determining a spring stiffness coefficient and a damping coefficient according to an actual distance between adjacent mass points; determining vibration mode characteristics of each die cutting device according to the spring stiffness coefficient and the damping coefficient, and converting a control signal generated according to the vibration mode characteristics into a parameter adjusting variable by using a preset control algorithm; and determining a vibration coupling relationship according to the collected vibration energy data of the initial interference group after the initial processing parameters are adjusted according to the parameter adjusting quantity, and determining an optimal production takt and a parameter compensation value according to the vibration coupling relationship. The technical problem that in the prior art, due to vibration coupling of a die cutting equipment group, the machining error cooperative control difficulty is large is solved.
Owner:SHENZHEN HUAYIXIN ELECTRONICS CO LTD
Foundation pit supporting structure deformation and internal force calculation method
PendingCN121211693AGeometric CADDesign optimisation/simulationStructural deformationStiffness coefficient
The invention discloses a foundation pit supporting structure deformation and internal force calculation method. In the calculation method, an out-pit constraint stiffness matrix is introduced as a calculation factor, and a stiffness coefficient is iteratively calculated; the calculation method comprises the following steps: S1, constructing a foundation pit supporting structure calculation model; s2, a displacement-load total balance equation of the supporting structure under the undetermined supporting working condition of the foundation pit is determined; s3, a servo support is installed, prestress is loaded, a constraint stiffness matrix is introduced, a stiffness coefficient is calculated in an iterative mode, a displacement-load total balance equation of the supporting structure is established step by step, and the deformation condition of the supporting structure is analyzed and calculated; s4-5, the steps S2 to S3 are repeated until installation of all servo supports and prestress loading are completed, and displacement and internal force of the supporting structure are calculated; and S6, the foundation pit continues to be excavated to the pit bottom, deformation and internal force under all working conditions are calculated, and regulation and control calculation can be conducted in the process. By means of the calculation method, accurate calculation of deformation and internal force of the foundation pit supporting structure under the servo supporting effect can be achieved.
Owner:SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
Robust adaptive variable admittance control method based on different intentions in feature space
The present application relates to a robust adaptive variable admittance control method based on different intentions in a feature space. The method includes: using the kinematic and dynamic models of the manipulator to determine the mapping relationship between the actual contact force and the virtual contact force; determining the adaptive stiffness coefficient based on the actual contact force change, and determining the robust adaptive virtual damping coefficient based on the direct intention based on the virtual motion speed of the feature point; adjusting the robust adaptive virtual damping coefficient based on the contact force expected by the robot, and determining the admittance control virtual damping coefficient based on direct and indirect intentions; determining the robust adaptive variable admittance control based on human intention in the feature space based on the mapping relationship, the adaptive stiffness coefficient and the admittance control virtual damping coefficient; determining the robot image visual servoing control law based on the real-time image feature points and the expected feature points, obtaining the real-time joint velocity of the manipulator, and controlling the manipulator movement.
Owner:SOUTHWEST JIAOTONG UNIV
Method for calculating equivalent pile length of long and short piles of foundation pit based on non-limit state
ActiveCN121457219AFoundation testingDesign optimisation/simulationStiffness coefficientComputational model
The invention discloses an equivalent pile length calculation method for long and short piles of a foundation pit based on a non-limit state, and relates to the field of equivalent pile length calculation, the equivalent pile length calculation method for the long and short piles of the foundation pit based on the non-limit state comprises the following steps: S1, acquiring parameters, and presetting a standard, principle and scheme set; s2, matching the long parameter with the scheme set, and arranging a displacement meter and a strain meter; s3, collecting data through a displacement meter and a strain meter, and forming effective mechanical response data; s4, establishing a stiffness load displacement equivalent length calculation model; s5, the rigidity coefficient and the load sharing proportion are calculated, and an equivalent pile length initial value is obtained through reverse deduction; and S6, the equivalent pile length initial value is adjusted, and a foundation pit long and short pile equivalent pile length calculation report is generated. According to the method, engineering suitability calculation of the equivalent pile length in a non-limit state is achieved through a non-limit state guided double-equivalent logic driven equivalent pile length calculation system for the long and short piles of the foundation pit, and the one-sided core pain point of single equivalent logic is avoided.
Owner:EAST CHINA JIAOTONG UNIVERSITY
Calculation method of broadband consistent damping force in time domain dynamic analysis
The invention discloses a method for calculating broadband consistent damping force in time-domain dynamic analysis, which comprises the following steps of: constructing a finite element model of a hydroelectric plant, endowing the model with material attributes, and then obtaining an initial stiffness matrix of the hydroelectric plant by adopting a finite element method; idealizing the finite element model as a main spring, and connecting a plurality of combined elements consisting of sticky kettles and springs in parallel to form an idealized model; according to the initial stiffness matrix, the dynamic stiffness model of the combined element and a damping ratio in time domain dynamic analysis, calculating a stiffness coefficient of each combined element by adopting a least square method; when the dominant frequency of the combined element is uniformly distributed in the broadband range, calculating the viscosity coefficient of the combined element according to the dominant frequency of the combined element and the target damping ratio; and according to the rigidity coefficient and the viscosity coefficient, a time domain damping force model is adopted to calculate the consistent damping force of the hydroelectric plant in the broadband range.
Owner:HUANENG LANCANG RIVER HYDROPOWER CO LTD +2
Active vibration absorber control strategy and system for vibration at tail end of flexible arm
The invention discloses an active vibration absorber control strategy for vibration at the tail end of a flexible arm, and relates to the technical field of mechanical arm control, and the active vibration absorber control strategy comprises the following steps: building a three-dimensional model for a two-degree-of-freedom flexible mechanical arm, describing the joint flexibility of a system by using a linear spring, and representing the rigidity coefficient of a flexible joint by using the elastic coefficient of the linear spring; fuzzy RBF adaptive PID control is trained in combination with a real object, the identification precision of the model is improved, and vibration suppression is realized; in the fuzzy control, input variables are fuzzified by simulating the thinking mode of human beings, reasoning is carried out in combination with expert experience rules, and finally a system of an accurate dynamic model is established. According to the control strategy, the limitation of a traditional control technology based on a model during control is reduced, dynamic hysteresis nonlinearity generated in actual work is effectively corrected, the control precision is improved, fuzzy rule parameters are adjusted through modal analysis in combination with system characteristics, and the control precision is improved. Therefore, the vibration suppression force synthesis in different scenes is more accurate, and the vibration suppression effect is better.
Owner:GUIZHOU UNIV
Variable damping-variable rigidity joint of robot grinding motorized spindle and flutter suppression method
The invention provides a variable damping-variable rigidity joint of a robot grinding motorized spindle and a flutter suppression method. The variable damping-variable rigidity joint comprises a driving end used for driving a grinding wheel to rotate. The variable damping-variable rigidity joint is used for adjusting grinding damping and rigidity; the upper computer is used for processing signals and calculating damping-rigidity; the torque sensor is used for detecting and collecting relative rotation angle signals and rotation torque signals of the grinding wheel; the variable damping-variable stiffness joint comprises a power input shaft, a magnetorheological fluid magnetic field coil, a disc type rotor, magnetorheological fluid, a stator coil, a permanent magnet, a connecting piece, a thin flexible rod, a rotating shell and a grinding output shaft. According to the method, the optimal joint damping coefficient-rigidity coefficient parameter combination is calculated, and the currents of the magnetorheological fluid coil and the stator coil are accurately adjusted, so that the torsional damping and torsional rigidity of the joint are controlled, high-efficiency and high-quality stable grinding work of the non-circular curved surface grinding robot is achieved, and the adaptive capacity of the robot to the grinding environment is improved.
Owner:JIANGSU UNIV
Evaluation method, device and medium for importance of plane frame structure members and joints
ActiveCN118709398BGeometric CADSustainable transportationStiffness coefficientStructural engineering
The present invention discloses a method, device and medium for evaluating the importance of plane frame structure members and joints, which relates to the field of structural engineering. Among them, the importance coefficient of a joint is determined based on the comprehensive stiffness coefficient of the joint, and then the energy distribution coefficient of a member is calculated by using the structural energy flow network. The importance coefficient of the joint is distributed to the member by using the energy distribution coefficient of the member to obtain the importance coefficient of each member. At the same time, when calculating the structural energy flow network diagram, it can be divided into the intact elastic state of the structure and the damaged elastoplastic state of the structure, and the importance distribution of members and joints in the two states of the structure can be calculated respectively. The method of the present invention can efficiently and reasonably quantify and evaluate the importance of members and joints in the intact elastic state and the damaged elastoplastic state of the plane frame structure, making up for the deficiencies of the existing methods for evaluating the importance of members and joints, such as unreasonable evaluation of the damage state, large computational amount and low evaluation efficiency.
Owner:CHONGQING UNIV
Steam turbine regulating valve performance monitoring method and steam turbine regulating valve
PendingCN119435154Aeasy to set upMachine valve testingMachines/enginesStiffness coefficientHealth index
The invention relates to a steam turbine regulating valve performance monitoring method and a steam turbine regulating valve. The method comprises the following steps: dividing working conditions; constructing a calculation model of the operation performance indexes of the regulating valve under different working conditions; initial measurement values of the operation performance indexes of the regulating valve under different working conditions are obtained, and a health index database is established; constructing an early warning threshold database of the operation performance indexes under different working conditions according to the health index database; the real-time value of the running time of the valve rod assembly under the preset stroke is obtained; judging whether the real-time value of the operation time exceeds an early warning threshold value of a working condition corresponding to the operation time or not; if yes, according to a calculation model, the real-time value of friction force between the valve rod assembly and the valve seat, the real-time value of thrust borne by an actuating mechanism of the hydraulic servo-motor and the real-time value of the elastic stiffness coefficient of the spring assembly are calculated so as to diagnose the fault position of the adjusting valve; the method has the advantages that the performance of the regulating valve can be accurately monitored, and the fault position can be quickly judged.
Owner:HUADIAN ELECTRIC POWER SCI INST CO LTD
Method for eliminating error of quasi-static compression mechanics experimental system
ActiveCN116499886BSustainable transportationMaterial strength using tensile/compressive forcesStiffness coefficientUniaxial compression
The present application belongs to the field of mechanics, and particularly relates to a method for eliminating error of a quasi-static compression mechanics experiment system. By using a constant pressure or a constant loading speed of a pressure head on a testing machine to perform quasi-static uniaxial compression on a test piece at room temperature, and taking two test pieces of different heights, the relationship between the system stiffness, the force and deformation of the system pressure head can be obtained, so as to obtain two corresponding force-time curves and displacement-time curves. By combining the two equations and eliminating the unknown Young's modulus E, the stiffness coefficient of the test system can be obtained, and the displacement-time curve of the pressure head can be obtained. Subsequently, the Young's modulus E can be inversely solved. The present application corrects the error of the mechanics experiment by defining the system stiffness coefficient, so as to realize a higher precision of the Young's modulus E and improve the accuracy of the quasi-static mechanics experiment.
Owner:NANJING UNIV OF SCI & TECH
A Timoshenko beam model equivalent method and system of a corrugated steel plate support structure
ActiveCN121598644BDesign optimisation/simulationSpecial data processing applicationsStiffness coefficientClassical mechanics
The present disclosure provides a Timoshenko beam model equivalent method and system of a corrugated steel plate support structure, and relates to the technical field of stress analysis of a corrugated steel plate support structure, comprising: solving the stiffness coefficients of the corrugated steel plate in a local coordinate system, including tensile stiffness, bending stiffness and shear stiffness; solving the equivalent stiffness coefficients of the orthotropic corrugated steel plate in a global coordinate system, including equivalent tensile stiffness, equivalent bending stiffness and equivalent shear stiffness; solving the equivalent section bending stiffness of the corrugated steel support structure; solving the equivalent section shear stiffness of the corrugated steel support structure; and equivalent the corrugated steel support structure to a Timoshenko beam model. The present disclosure can realize the rapid equivalent of the corrugated steel plate support structure to a Timoshenko beam model.
Owner:SHANDONG UNIV +1
Sample shearing device
ActiveCN222379426Uavoid damageavoid accuracyPreparing sample for investigationWork holdersStiffness coefficientClassical mechanics
The utility model provides a sample shearing device, and relates to the technical field of cutting. The elastic parts are connected to a cutting plate of the cutting mechanism at intervals, the axes of the elastic parts are arranged in the cutting direction of the cutting plate, a plurality of adjusting plates are arranged on each elastic part in the cutting direction at intervals, and a partition part is detachably connected between every two adjacent adjusting plates; when the fixing force of the elastic pieces under the same deformation quantity needs to be adjusted, the partition pieces are arranged between every two adjacent adjusting plates of part of the adjusting plates, the elastic pieces at the corresponding positions cannot generate elastic force due to the fact that every two adjacent adjusting plates provided with the partition pieces cannot stretch out and draw back, and the elastic force can only be generated through the elastic pieces which are not located at the limiting positions; therefore, the stiffness coefficient of the elastic piece can be increased, larger fixing force can be generated under the same deformation quantity, different fixing forces can be used according to corresponding samples, and the shearing quality and efficiency are improved.
Owner:LINGYUAN IRON & STEEL CO LTD
Method for determining p-wave velocity of fluid replacement in anisotropic media and related apparatus
The application provides a method for determining the longitudinal wave velocity after fluid replacement in an anisotropic medium and related equipment. The method comprises the following steps: determining an average bulk modulus based on a matrix bulk modulus; determining a first bulk modulus when the medium contains fluid based on first property data; determining a second bulk modulus when the medium does not contain fluid based on the first property data, the matrix bulk modulus, the average bulk modulus and the first bulk modulus; determining a second vertical stiffness coefficient when the medium does not contain fluid based on the first property data, the average bulk modulus, the first bulk modulus and the second bulk modulus; obtaining second property data of each predetermined replacement fluid; and determining the longitudinal wave velocity after the fluid in the medium is replaced by the predetermined replacement fluid based on the first property data, the average bulk modulus, the second bulk modulus, the second vertical stiffness coefficient and the second property data. The technical problem that the longitudinal wave velocity determined after fluid replacement in an anisotropic medium is not accurate in the prior art is solved.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
Machining precision control method and management system for numerical control milling and boring machine
The invention discloses a numerical control milling and boring machine machining precision control method and a numerical control milling and boring machine machining precision management system, and relates to the technical field of milling and boring machine precision control. Calculating to obtain a comprehensive error predicted value delta pred by combining the square sum of the delta z and the sum value of the cutting force deformation delta form and the thermal deformation error delta thermal at the same time; then through the synchronously-arranged closed-loop feedback adjustment on the rigidity coefficient, the machining precision of the milling and boring machine can be better guaranteed, the machining precision of the milling and boring machine is adjusted in order and within a reasonable range in combination with the real-time situation monitored on site, and excessive adjustment is avoided; and meanwhile, different conditions after adjustment can be analyzed again, and more refined adjustment and attack control can be carried out.
Owner:HUNAN HANXUAN MASCH CO LTD