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43 results about "Virtual displacement" patented technology
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In analytical mechanics, a branch of applied mathematics and physics, a virtual displacement δrᵢ "is an assumed infinitesimal change of system coordinates occurring while time is held constant. It is called virtual rather than real since no actual displacement can take place without the passage of time." Also, virtual displacements are spatial displacements exclusively - time is fixed while they occur.
Human posture feature extraction in personal emergency response systems and methods
A non-wearable Personal Emergency Response System (PERS) architecture is provided, implementing RF interferometry using synthetic aperture antenna arrays to derive ultra-wideband echo signals which are analyzed and then processed by a two-stage human state classifier and abnormal states pattern recognition. Systems and methods transmit ultra-wide band radio frequency signals at, and receive echo signals from, the environment, process the received echo signals to derive a spatial distribution of echo sources in the environment using spatial parameters of the at least one transmitting and / or receiving antennas, and estimate postures human(s) in the environment by analyzing the spatial distribution with respect to echo intensity. The antennas may be arranged in several linear baselines, implement virtual displacements, and may be set into multiple communicating sub-arrays. The decision process is carried out based on the instantaneous human state (local decision) followed by abnormal states patterns recognition (global decision).
Owner:ECHOCARE TECH LTD
Method for computing electromagnetic force of transformer iron core based on finite element method
InactiveCN106570218ACalculation method directlyCalculation method is simpleDesign optimisation/simulationSpecial data processing applicationsTransformerLow voltage
The invention discloses a method for computing electromagnetic force of a transformer iron core based on a finite element method. The method comprises the steps that structural parameters of a winding, the iron core and a fuel tank of a transformer are collected, and then a three-dimensional geometric grid model of the transformer is established; the three-dimensional geometric grid model is input into software, sinusoidal currents with a phase different of 120 DEG are applied to the cross section of the three-phase low voltage winding respectively, and Dirichlet boundary conditions are applied to the outer side of the structural grid model; and an instant electromagnetic field is solved by a virtual displacement method, magnetic field energy is computed, a virtual work method is used to compute instant electromagnetic force borne by the transformer iron core and the winding, FFT is conducted to the instant electromagnetic force, and frequency domain distribution of the electromagnetic force of the iron core can be obtained. The computation method disclosed by the invention is direct and convenient; electromagnetic vibration and force bearing situations of the transformer iron core can be analyzed from the perspective of energy; each influential factor on force bearing of the iron core is considered comprehensively; and computation results are accurate and reliable.
Owner:CHINA ELECTRIC POWER RES INST +1
Ultra-wide band antenna arrays and related methods in personal emergency response systems
A non-wearable Personal Emergency Response System (PERS) architecture is provided, implementing RF interferometry using synthetic aperture antenna arrays to derive ultra-wideband echo signals which are analyzed and then processed by a two-stage human state classifier and abnormal states pattern recognition. Systems and methods transmit ultra-wide band radio frequency signals at, and receive echo signals from, the environment, process the received echo signals to yield a range-bin-based slow signal that is spatio-temporally characterized over multiple spatial range bins and multiple temporal sub-frames, respectively, and derive from the slow signal multiple characteristics of human(s) in the environment. The reception antennas may be arranged in several linear baselines, implement virtual displacements, and may be set into multiple communicating sub-arrays. The decision process is carried out based on the instantaneous human state (local decision) followed by abnormal states patterns recognition (global decision).
Owner:ECHOCARE TECH LTD
Human respiration feature extraction in personal emergency response systems and methods
A non-wearable Personal Emergency Response System (PERS) architecture is provided, implementing RF interferometry using synthetic aperture antenna arrays to derive ultra-wideband echo signals which are analyzed and then processed by a two-stage human state classifier and abnormal states pattern recognition. Systems and methods transmit ultra-wide band radio frequency signals at, and receive echo signals from, the environment, process the received echo signals to yield a range-bin-based slow signal that is spatially characterized over a plurality of spatial range bins, and estimate respiration parameter(s) of the human(s) by analyzing the slow signal. The antennas may be arranged in several linear baselines, implement virtual displacements, and may be set into multiple communicating sub-arrays. A classifier uses respiration and other derived features to classify the state of the human(s). A decision process is carried out based on the instantaneous human state (local decision) followed by abnormal states patterns recognition (global decision).
Owner:ECHOCARE TECH LTD
Cable buckling modeling method
ActiveCN106886645AReduce stressReasonable casing heightDesign optimisation/simulationSpecial data processing applicationsVirtual displacementEngineering
The invention discloses a cable buckling modeling method. The modeling method comprises the steps of performing node division on an original whole cable core wire according to a change property of a geometric shape; decomposing the cable core wire into small units; constructing a corresponding stiffness matrix; and establishing a balance relationship by adopting a virtual displacement principle. Any point P is obtained in the cable core wire, and a tiny parallelepiped is cut, wherein the edge lengths in x, y and z directions are dx, dy and dz respectively. Firstly, a straight line for connecting the centers of the front and back surfaces of the hexahedron is taken as a moment axis; a balance equation sigma Mee'=0 of moments is listed out; and two similar equations are obtained according to the rest of two balance equations sigma Fy=0 and sigma Fz=0. According to the modeling method, a buckling stress generated during excessive cutting of cable wire cores with different lengths based on ANSYS finite element software is simulated, an influence law of core wire length on casing stress is analyzed, a simulation result shows that the casing stress is remarkably reduced with increment of the cable wire core length, and a reasonable casing height is given. A theoretical basis is provided for reasonable design and installation of a cable terminal of a ring main unit.
Owner:CHINA THREE GORGES UNIV
Human posture feature extraction in personal emergency response systems and methods
A non-wearable Personal Emergency Response System (PERS) architecture is provided, implementing RF interferometry using synthetic aperture antenna arrays to derive ultra-wideband echo signals which are analyzed and then processed by a two-stage human state classifier and abnormal states pattern recognition. Systems and methods transmit ultra-wide band radio frequency signals at, and receive echo signals from, the environment, process the received echo signals to derive a spatial distribution of echo sources in the environment using spatial parameters of the at least one transmitting and / or receiving antennas, and estimate postures human(s) in the environment by analyzing the spatial distribution with respect to echo intensity. The antennas may be arranged in several linear baselines, implement virtual displacements, and may be set into multiple communicating sub-arrays. The decision process is carried out based on the instantaneous human state (local decision) followed by abnormal states patterns recognition (global decision).
Owner:ECHOCARE TECH LTD
Transformer substation inspection robot navigation system and transformer substation inspection robot navigation method
ActiveCN109031373AImprove Outdoor Navigation AccuracyImprove stabilitySatellite radio beaconingReal time navigationTransformer
The invention discloses a transformer substation inspection robot navigation system and a transformer substation inspection robot navigation method. The transformer substation inspection robot navigation system comprises a robot body and a ground station. The ground station is used to transmit difference information to the robot body. The robot body is used to process the difference information toacquire positioning information, and the robot body is used to acquire first measuring navigation information of a current mobile station by virtual displacement information, gesture information, andpositioning information through a fusion algorithm, and the virtual displacement information and the gesture information are provided by the robot body. The robot body is used to establish a raster map according to polar coordinate information, and according to the raster map and the polar coordinate information, the second measuring navigation information of the current mobile station is acquired. The robot body is used to fuse the first measuring navigation information and the second measuring navigation information by Kalman filtering to acquire real-time navigation information. Accordingto the invention, automatic navigation capability is provided, and outdoor navigation precision and navigation stability are greatly improved.
Owner:BEIJING AEROSPACE GUANGHUA ELECTRONIC TECH CO LTD
Design method of compact plane structure parabolic reflector antenna based on meta-material
ActiveCN105305096ACompact structureAvoid separationRadiating elements structural formsVirtual displacementParaboloid
The invention discloses a design method of a compact plane structure parabolic reflector antenna based on meta-material. The design method comprises the following steps that a feed source unit with a plane boundary is designed by using the principle of transformation electromagnetics; a plane structure parabolic reflector is adopted to replace a conventional curved surface structure parabolic reflector to act as the reflecting surface of the reflector antenna; and the plane reflector and the feed source unit are combined to be designed into the compact plane reflector antenna. The plane reflector is adopted to act as the reflecting surface and the reflecting characteristics of the plane reflector are equivalent to those of the conventional parabolic reflector; the designed feed source unit is transparent to rays without blocking to the rays, and the radiation characteristics of a feed source arranged in the feed source unit are equivalent to the radiation characteristics generated by the feed source arranged at the position far from the reflecting surface due to the virtual displacement effect generated by the metal-material; and the reflector and the feed source unit are combined together in the reflector antenna to form a compact structure so that the phenomenon of separation of the reflecting surface and the feed source in the conventional reflector antenna can be avoided.
Owner:SHANGHAI NORMAL UNIVERSITY
Sensitivity solving method under multiple displacement constraints
ActiveCN106202699AFully consider reusabilityImprove efficiencyGeometric CADSpecial data processing applicationsVirtual displacementReusability
The invention discloses a sensitivity solving method under multiple displacement constraints. The sensitivity solving method comprises the following steps: constructing an airplane structure optimization model, and acquiring variables, boundary conditions and displacement constraint information of the optimization model under respective working conditions; performing static analysis, and calculating a real displacement; grouping the working conditions according to the boundary conditions and the displacement constraints to obtain a real displacement matrix U; performing reduction K according to the boundary conditions to form Ki; defining a virtual load array Pri according to the displacement constraints; solving the equation set Ki*Upsei=Pri; calculating unit differential matrixes Kde, and assembling a structural differential matrix Kd; and extracting respective columns of the real displacement matrix U, transposing the columns, multiplying the columns with corresponding columns of the structural differential stiffness matrix Kd and a virtual displacement array Upse to obtain each displacement constraint sensitivity of the current variable. The method solves the problem of sensitivity solving of multiple displacement constraints under different working conditions; no assumption of a boundary of a virtual working condition is needed in advance; and when a static balance equation is solved, the data reusability is considered, so that a sensitive information-based planning method can be applied to structural optimization problems under global constraints such as displacement.
Owner:CHINA AIRPLANT STRENGTH RES INST
Linkage locking anti-rebounding civil defense door utilizing fluid pressure
PendingCN108222788AFix stability issuesSolve operational problemsWing accessoriesNon-mechanical controlsVirtual displacementEngineering
The invention relates to protective equipment in the field of civil defense engineering and national defense engineering and discloses a linkage locking anti-rebounding civil defense door utilizing fluid pressure. The linkage locking anti-rebounding civil defense door comprises a door frame, door leaves, fluid pressure systems arranged on the door leaves, and lock heads used for opening and closing. The door leaves and the door frame are connected through hinges; each fluid pressure system comprises a pump, a reversing valve, pipelines and a plurality of double-effect pressure cylinders; the pumps communicate with the reversing valves, and the reversing valves communicate with the double-effect pressure cylinders through pipelines; the lock heads are in matched connection with the double-effect pressure cylinders and comprise lock bodies and sliding lock cylinders; lock boxes matched with the lock cylinders correspondingly are arranged on the door frame; and limiting grooves are formedin the lock cylinders, and limiting blocks in sliding fit with the limiting grooves are arranged on the lock bodies. The fluid pressure system in the linkage locking anti-rebounding civil defense door can keep the stable pressure in a long term, and the pressure is transmitted through fluids, so that operation is easier, linkage is more stable and more reliable, and virtual displacement is avoided; and synchronous linkage arrangement is conducted, and thus synchronization of the multiple lock heads at the time of executing unlocking and locking is better; and therefore, the locking anti-rebounding civil defense door is worth popularizing.
Owner:张阳鑫
Method for calculating drilling layering critical axial force of composite material plate by considering deformation
The invention discloses a method for calculating drilling layering critical axial force of a composite material plate by considering deformation. The method is characterized in that: aiming at the drilling layering defect of the carbon fiber composite material with smaller thickness, the influence of the bending deformation of the composite material component on the drilling layering in the drilling process is considered, and the critical axial force for generating the layering defect is calculated, and then the layering defect in the drilling process is effectively predicted; and meanwhile, the combined action of a tool chisel edge and a main cutting edge is considered, and the axial force borne by the tool chisel edge part is equivalent to the concentrated force effect, and the axial force borne by the tool main cutting edge is equivalent to the uniform distribution force effect, and the drilling layered critical axial force considering the overall and local bending deformation of the composite material is finally obtained by applying the virtual displacement principle. According to the method, the stress condition of the tool in the drilling process and the deformation conditionof the composite material are fully considered; the carbon fiber composite material drilling layering defect prediction model is established; the drilling layering critical axial force is calculated;and the method has a very good effect on inhibiting the drilling layering defects of the carbon fiber composite material.
Owner:DALIAN UNIV OF TECH
System and method for monitoring building displacement in fire based on Beidou satellites
PendingCN109405731AAvoid security crisisElectrical/magnetic solid deformation measurementSatellite radio beaconingNetwork connectionVirtual displacement
The invention provides a system and method for monitoring building displacement in fire based on Beidou satellites. The system comprises a control center, a plurality of monitoring stations and a plurality of reference stations. The monitoring stations and the reference stations are disposed at stable base points, and the monitoring stations and the reference stations are each provided with a GNSSreceiver, and the GNSS receivers are connected with the control center through a network. The control center includes a client, a database, and a resolving unit, wherein the client is used for data analysis, icon display, and alarm, the resolving unit is used for receiving the data transmitted by the GNSS receivers and performing data conversion, and the database is used for storing the data solved by the solving unit as a data source for the client 5 for data analysis. A virtual displacement monitor is installed on a monitored building, and transmits the data to the GNSS receivers of the monitoring stations in real time, and the Beidou satellites simultaneously receive signals from the GNSS receivers of the monitoring stations and the reference stations.
Owner:HUAQIAO UNIVERSITY
Human respiration feature extraction in personal emergency response systems and methods
A non-wearable Personal Emergency Response System (PERS) architecture is provided, implementing RF interferometry using synthetic aperture antenna arrays to derive ultra-wideband echo signals which are analyzed and then processed by a two-stage human state classifier and abnormal states pattern recognition. Systems and methods transmit ultra-wide band radio frequency signals at, and receive echo signals from, the environment, process the received echo signals to yield a range-bin-based slow signal that is spatially characterized over a plurality of spatial range bins, and estimate respiration parameter(s) of the human(s) by analyzing the slow signal. The antennas may be arranged in several linear baselines, implement virtual displacements, and may be set into multiple communicating sub-arrays. A classifier uses respiration and other derived features to classify the state of the human(s). A decision process is carried out based on the instantaneous human state (local decision) followed by abnormal states patterns recognition (global decision).
Owner:ECHOCARE TECH LTD
Virtual displacement tester for measuring virtual displacement of reduction gear unit
ActiveCN106324504AEasy to operateEasy to useDynamo-electric machine testingVirtual displacementControl theory
The invention is applicable to the technical field of measuring devices, and provides a virtual displacement tester for measuring virtual displacement of a reduction gear unit. The virtual displacement tester comprises a base, a main control board, a display screen, an adjusting mechanism and a bilateral adjusting component, the adjusting mechanism comprises a rudder arm, a magnetic ring, a sub-circuit board, an angle sensor, a horizontal adjusting component and a vertical adjusting component, the rudder arm is mounted on an output shaft, the angle sensor is opposite to the magnetic ring, and the angle change of the magnetic ring is detected by the aid of the angle sensor. According to the virtual displacement tester for measuring virtual displacement of the reduction gear unit, the magnetic ring is mounted on the rudder arm, the position of the angle sensor relative to the magnetic ring on the sub-circuit board is adjusted by the horizontal adjusting component, the vertical adjusting component and the bilateral adjusting component, so that the angle sensor is adjusted to be aligned to the magnetic ring, the aligning position of the angle sensor and the magnetic ring is kept, and the angle change of the magnetic ring is detected by the aid of the angle sensor to effectively test virtual displacement errors of the reduction gear unit.
Owner:UBTECH ROBOTICS CORP LTD
Design method applied to mooring system
InactiveCN110298123AInnovative ideasImprove build efficiencyDesign optimisation/simulationSpecial data processing applicationsMooring systemNonlinear systems of equations
The invention discloses a design method applied to a mooring system, which comprises the following steps of: (1) setting wind power Ff in the horizontal direction as main power, taking the position ofa connecting point of an anchor and an anchor chain as an origin of coordinates, taking a seabed as an X axis and taking the direction vertical to the seabed as a Y axis, establishing a generalized coordinate system and drawing a coordinate schematic diagram; (2) carrying out stress analysis from top to bottom from the buoy, and sequentially establishing virtual work equations of the buoy, the steel pipe, the steel barrel, the heavy ball and the anchor chain; (3) solving a constraint virtual displacement equation of the buoy, the steel pipe, the steel barrel, the weight ball and the anchor chain according to the virtual work equation of the buoy, the steel pipe, the steel barrel, the weight ball and the anchor chain; (4) constructing an objective function from the generalized coordinate system; and (5) solving a nonlinear equation set composed of a virtual work equation and a constraint virtual displacement equation according to the objective function, and calculating the inclinationof the anchor chain, the steel barrel and the steel pipe, the depth of the buoy entering water and the floating range of the buoy.
Owner:HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
A method for solving discrepancy between optical flow field and motion field due to self-similar characteristics
In order to improve the consistency of an optical flow field and a motion field due to the self-similar characteristicsj, a method for detecting the inconsistency between optical flow field and motionfield generated by the self-similar feature includes the steps of obtaining single channel video stream and single channel gray scale image, carrying out the image pyramid processing on the image tomake the pyramid of K layers; dividing the first pyramid layer of the original image into detection regions, detecting a feature point in each detection region, calculating a virtual displacement sequence V on the original image, and obtaining a virtual displacement image sequence IV, comprising m virtual displacement images; carrying out image pyramid processing on each virtual displacement imageto obtain m K-layer virtual displacement pyramids, wherein each V (i) corresponds to one virtual displacement pyramid; finally, obtaining the optical flow field by traditional optical flow tracking using the feature points after virtual displacement filtering.
Owner:深圳市艾为智能有限公司
400Hz structural performance balanced cable for ships and manufacture method thereof
InactiveCN102969062AEasy to bendSmall outer diameterPower cablesCable/conductor manufacturePower cableElectrical conductor
The invention relates to a 400Hz structural performance balanced cable for ships and a manufacture method thereof. The centers of three composite cable cores are connected into a regular triangle; the center of each composite cable core is a power cable conductor and is extruded and wrapped with a power cable insulating layer, and the periphery of each power cable insulating layer is provided with an insulating wire core set which is formed in a twisting way; ten grounding conductors are divided into two sets and are symmetrically arranged around each power cable insulating layer; eight control wire cores are divided into four sets, and are respectively arranged into two sets between two sets of grounding conductors, and a virtual displacement member is respectively arranged among each set of the control wire cores and between the control wire cores and the grounding conductors; the outer diameters of each grounding conductor, control wire core and virtual displacement member are the same as one another and are distributed on the same circle; the periphery of the insulating wire core set is extruded and wrapped with an internal protecting bush, and the periphery of the internal protecting bush is extruded and wrapped with an external protecting bush; and the external protecting bushes of the three composite cable cores are tangent with one another two by two and are glued into a whole. The cable simultaneously has the functions of a power cable and a control cable, and is balanced in structure and small in outer diameter and bending radius.
Owner:JIANGSU YUANYANG DONGZE CABLE
Mechanical-hydraulic guiding virtual displacement variable hydraulic transformer and variable method
InactiveCN101398018AMovement without hindranceTorque is not consumedServomotor componentsFluid-pressure convertersVirtual displacementOil distribution
The invention relates to a hydraulic transformer and a control method thereof which aims at providing a mechanism-liquid lead virtual displacement variable hydraulic transformer and a variable technique. The hydraulic transformer comprises a torque filtering device, a ration swash plate, a plunger case, a plunger and a plunger cavity as well as an oil distribution valve bank, an oil distribution plate and a mechanism-liquid virtual displacement variable driving device. Compared with the prior art, the hydraulic transformer has the beneficial effects such as simplifying the structure, several-fold increasing the high efficient variable control range, saving energy, continuously variable of the pressurization and depressurization operating mode, increasing an order of magnitude in response speed, avoiding the zero crossing problem, and the like.
Owner:杭州慧翔机电控制工程有限公司 +1
Dam state prediction method and system based on data assimilation
ActiveCN114547951AAdjust the direction of evolution in real timeImprove estimation accuracyGeometric CADClimate change adaptationState predictionAlgorithm
The invention discloses a dam state prediction method and system based on data assimilation, and belongs to the technical field of dam state prediction. According to an existing dam state prediction method, the calculation precision is extremely dependent on correct description of a concrete material constitutive model, generally, model parameters can only be obtained from prototype observation or twinborn experiments, and determination and calibration of the parameters are complex. According to the method, the nonlinear evolution characteristic of a concrete material along with time is fully considered, a data assimilation model is constructed by utilizing a dam body virtual displacement field and the displacement amount of an actual dam measurement point at the same moment, and displacement back analysis is performed on linear elastic constitutive parameters of the concrete material of the dam; observation data is introduced into the data assimilation model for model updating, the influence of data errors on the model is fully considered, and the evolution direction of the data assimilation model is adjusted in real time, so that the estimation precision of the data assimilation model is improved, the prediction capability of a prediction model is effectively improved, and important reference data can be provided for real-time early warning analysis of a dam.
Owner:浙江远算科技有限公司 +1
Inverse problem design method for quasi-s1 flow surface of axial flow compressor
ActiveCN110566506BIncrease pressure ratioImprove insulation efficiencyGeometric CADPump componentsVirtual displacementLoad distribution
Owner:NORTHWESTERN POLYTECHNICAL UNIV
An identification method of road driving quality based on inverse virtual excitation method
ActiveCN107894223BAccurate and real-time identificationImprove efficiencyMeasurement devicesMatrix inverseVirtual displacement
The invention discloses a road surface riding quality identification method based on an inverse virtual excitation method. The road surface riding quality identification method comprises the steps ofestablishing a 1 / 2 vehicle 6-DOF system model, obtaining a frequency response function matrix [H(f)] of the system, and based on a matrix inverse transformation method, solving for a generalized inverse matrix [H(f)]+ of the frequency response function matrix of the system; obtaining an unsprung mass and centroid vertical acceleration of a front axle and an unsprung mass and centroid vertical acceleration of a rear axle, obtaining a vehicle body centroid vertical acceleration and a vehicle body pitch acceleration, and constructing a vertical displacement response vector {z-tilde(t)} of the system using a fast Fourier transform method; according to the generalized inverse matrix [H(f)]+ and the virtual displacement response vector {z-tilde(t)}, solving for an effective road surface virtualexcitation vector {qe-tilde(t)}, and according to a time domain transfer function H(f)qe~qr of tire containment characteristics, solving for an actual road surface virtual excitation vector {qr-tilde(t)}; and according to the actual road surface virtual excitation vector {qr-tilde(t)}, solving for an international roughness index (IRI) of the spatial frequency to further obtain the road surface riding quality index (RQI). The method is simple to operate and high in efficiency.
Owner:JILIN UNIV
Geometric nonlinear analysis method for CFRP (carbon fiber reinforced plastic) laminated plate in humid and hot environment
InactiveCN113486496AClose to goodGood methodDesign optimisation/simulationSpecial data processing applicationsFiberShear deformation theory
The invention relates to a geometric nonlinear analysis method for a carbon fiber reinforced plastic (CFRP) laminated plate under the action of uniformly distributed load in a humid and hot environment, and belongs to the technical field of modern engineering structure analysis and application, namely the influence of a humid and hot effect is considered in a CFRP engineering structure based on a Reddy high-order shear deformation theory. According to the method, aiming at solving the problem of damp and hot deformation in engineering materials, a geometric nonlinear control equation is deduced by utilizing a virtual displacement method, and the boundary condition is considered to be elastic limited rotation; then, physical parameters of the CFRP are regarded as constants in the damp-heat effect, a Galerkin method is used for solving a control equation, and the clamped rectangular CFRP laminated board is used; according to the method, the damp-heat deformation prediction of the engineering structure is realized by utilizing a nonlinear analysis method, a new method is provided for the structural damage prediction of the CFRP, and the method has certain guiding significance in reducing composite material structure accidents.
Owner:HUNAN UNIV
Truss structure damage evaluation method based on pulsation test
ActiveCN112525519AShorten the timeCut costsMachine part testingAnalysing solids using sonic/ultrasonic/infrasonic wavesElement modelStructure health monitoring
The invention discloses a truss structure damage evaluation method based on a pulsation test, and relates to the field of structure health monitoring. The method comprises the steps: firstly, numbering all rod pieces of a truss structure and degrees of freedom of all end nodes of the rod pieces, and establishing a finite element model of the truss structure to obtain a rigidity matrix and a mass matrix; secondly, mounting wireless acceleration sensors on all nodes of the truss structure, and recording characteristic values of all orders of structural pulsation and corresponding vibration modes; carrying out normalization operation on each order of vibration mode; calculating a virtual displacement matrix, a damage index vector and a damage degree factor of the truss structure; and finally,evaluating the position of the damaged rod pieces according to the damage index vector, and evaluating the damage degree according to the damage degree factor. When the method is used for evaluatingthe damage of the truss structure, no special manual excitation external load needs to be applied, and the time and cost required by damage evaluation can be saved.
Owner:NINGBO UNIVERSITY OF TECHNOLOGY
Method for optimized autonomous driving of vehicle
PendingCN112440993AImprove propertiesOptimize trajectoryNavigation instrumentsOther vehicle parametersControl engineeringVirtual displacement
A method and device for optimized autonomous driving are provided. A trajectory (106) for the actuation of a vehicle (100) is determined. A profile of the trajectory (106) is defined by a bending lineof a bending band (300) . The bending line is preferably determined by the finite element method, in particular according to the principle of virtual shifting, and achieves an optimization goal and satisfies a boundary condition. The boundary condition is defined in accordance with a profile of a roadway (102) for the vehicle (100). The optimization goal is defined by a desired driving property of the vehicle (100).
Owner:DR ING H C F PORSCHE AG
A control method of a speed servo system
ActiveCN110611470BQuick responseSolve the problem of slow response speedMotor parameters estimation/adaptationSimulationVirtual displacement
Owner:YUBEI XINXIANG POWER STEERING SYST
A Method for Correcting the Influence of Thermal Air Flow on the Measurement Accuracy of Digital Image Correlation
ActiveCN108955551BEasy to implementGuaranteed corrective effectUsing optical meansMeasurement deviceVirtual displacement
Owner:SOUTHEAST UNIV
Numerical method and system for simulating crack tip stress field
ActiveCN111274665AHigh precisionImprove stabilitySustainable transportationDesign optimisation/simulationNumerical methodologyVirtual displacement
The embodiment of the invention relates to a numerical method and system for simulating a crack tip stress field, and the method comprises the steps: employing two-dimensional geometric description inparameter coordinates of a crack tip region, and obtaining a two-dimensional geometric description formula of the crack tip region according to a crack curve and a circumferential boundary curve; converting the two-dimensional geometric description formula into a displacement approximate expression of a crack tip region by utilizing a one-dimensional basis function in a xi direction and a one-dimensional basis function in an eta direction; converting an expression of a virtual displacement principle into a weak form in a crack tip region based on a linear elasticity problem equation; obtaining a solving equation formed by a rigidity matrix, a force vector and a displacement vector according to the displacement approximate expression in combination with a weak form; and solving a variableto be solved according to the solving equation, and obtaining a stress field of the crack tip region based on solving of the variable to be solved and the like. According to the invention, the crack tip stress field can be accurately simulated, the stress solution can gradually converge to an accurate solution, and the precision and stability of numerical simulation are improved.
Owner:CHINA SPECIAL EQUIP INSPECTION & RES INST
Method for solving continuous beam support counterforce
InactiveCN110672286AHigh precisionThe calculation formula is simpleElasticity measurementReliable computingTheoretical computer science
The invention relates to a method for solving continuous beam support counterforce and belongs to the technical field of structural mechanics. The invention particularly relates to a method for solving the continuous beam support reaction force. The method for solving the continuous beam support counterforce provided by the invention has the advantages of accurate and reliable calculation result and simple calculation process, and the method is a matrix lever method. According to the method, a support counterforce value is calculated by uniformly compiling numbering codes for supports, establishing a matrix lever method basic system, listing linear equations, listing matrixes, selecting basic structure calculation coefficients and free items and inputting coefficient and free item calculation results into a matrix. The matrix lever method is based on lever principle moment balance and is not based on a virtual work principle and the assumption of structural virtual displacement, the calculation method is single, disorder is not prone to occur after the numbering codes are compiled on the supports in a unified mode, the calculation is mostly repeated calculation work, the programming is simple, the calculation result precision is high, the universality is high, and the computer program operation is easy to achieve.
Owner:王开明
A Modeling Method for Cable Buckling
ActiveCN106886645BReduce stressReasonable casing heightDesign optimisation/simulationSpecial data processing applicationsModelSimClassical mechanics
Owner:CHINA THREE GORGES UNIV
Track generation method for balancing impact dynamic load in robot picking and placing task
ActiveCN111966040AHigh control precisionAccurate pick and place tasksNumerical controlMathematical modelSimulation
The invention discloses a track generation method for balancing impact dynamic load in a robot picking and placing task. The method comprises steps of obtaining link and joint parameters, obtaining apose mathematical model of the six-axis robot joint and the end effector and obtaining intersection point positions of the three intersected connecting rods; calculating the component of the tail endrotating rod to obtain the set axial angles of the three crossed connecting rods; obtaining a Lagrange model by summing the product of the externally applied acting force and the virtual displacementset of the generalized coordinates to be zero; selecting a plurality of path points in a sliding manner for track fitting, obtaining a picking and placing movement track, obtaining a set power value to optimize external load distribution torque, calculating a joint rotation angle according to the set optimized power value, and combining the obtained picking and placing movement track to obtain theoptimized picking and placing movement track, so that the control precision of the robot in the process of completing a picking and placing task is improved, and the accuracy of a picking and placingposition is ensured.
Owner:NANJING CHENGUANG GRP +1
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