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1821results about "Vibration testing" patented technology
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Out-of-Distribution Fault Detection Method and System Based on Energy Propagation and Graph Learning
The present invention relates to the technical field of intelligent out-of-distribution fault detection for construction machinery, and discloses an out-of-distribution fault detection method and system based on energy propagation and graph learning, and the method includes: acquiring vibration acceleration signals in typical fault states, carrying out similarity calculation to obtain an adjacency matrix composed of the maximum mutual information coefficients, and taking the adjacency matrix as input in a graph neural network; carrying out feature extraction on the adjacency matrix through adopting a GraphSage graph convolution method, and generating each node representation; calculating an energy score of each node, and distinguishing between in-distribution data and out-of-distribution data; and enhancing out-of-distribution data confidence estimation for each node, and carrying out out-of-distribution data identification and out-of-distribution data detection under different working conditions of a rolling bearing.
Owner:BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
Vessel equipment vibration test method and system based on frequency domain kurtosis mapping and non-Gaussian signal generation
The invention discloses a ship equipment vibration test method and system based on frequency domain kurtosis mapping and non-Gaussian signal generation. The ship equipment vibration test method comprises the following steps: collecting an actual ship impact vibration signal and extracting a target power spectral density curve; the method comprises the following steps: identifying an impact energy concentration frequency band based on spectrum energy distribution, carrying out frequency band division by adopting an elliptical filter bank with a second-order section structure, and calculating an envelope kurtosis value of each frequency band to establish a kurtosis-frequency mapping model; after the initial Gaussian driving signal is generated, a non-Gaussian driving signal is generated through a phase randomization and amplitude dynamic scaling algorithm based on a mapping model; a multi-target optimization controller based on Pareto leading edge search is adopted, a power spectral density error and a kurtosis error are taken as optimization targets, synchronous optimization is carried out through fast non-dominated sorting and an adaptive hybrid variation strategy, and a driving signal is output. According to the invention, the broadband and non-Gaussian impact vibration environment of the ship equipment in the actual severe sea condition can be reproduced in a high-fidelity manner, and the authenticity of the test and the fault mode coverage capability are remarkably improved.
Owner:CHINA SHIPBUILDING IND CORP NO 723 RESEARCH INSTITUTE
Electrified vibration test clamp for surface-mounted integrated circuit with pins
PendingCN121522422AElectronic circuit testingMeasurement instrument housingHemt circuitsTest fixture
The invention relates to an electrified vibration test clamp for a pin-containing surface-mounted integrated circuit, belonging to the technical field of integrated circuit test. Comprising a road board part and a structural member part, and the structural member part comprises a limiting base, a fixing buckle and a silica gel sheet for pressing the fixing buckle. The test circuit and peripheral elements thereof are arranged on one side of the circuit board, and the package of the device to be tested is independently arranged on the other side of the circuit board. The limiting base is used for being installed and fixed on a functional circuit board, a positioning groove for containing a device is formed in the limiting base, the position of a notch is just consistent with the packaging layout position of the device on the circuit board, and after the device is placed in the notch, pins can be matched with bonding pads in a one-to-one correspondence mode. The fixing buckle is installed and fixed on the notch of the limiting base for placing the device and reliably presses the pin of the device. The problems that the reliability of surface pressing type and pin locking type testing technologies is poor and a testing device is easily damaged during an electrified vibration test of an existing pin-mounted surface-mounted integrated circuit are solved. The device can be widely applied to electrified vibration and related environment tests of surface-mounted integrated circuits with pins.
Owner:GUIZHOU ZHENHUA FENGGUANG SEMICON
Vibration test bench
The invention provides a vibration test bench, and relates to a vibration test device, and the vibration test bench comprises a pedestal, and a plurality of vibration frames which are arranged on the pedestal in parallel at intervals and are sequentially arranged on the pedestal from top to bottom; each sliding guide rail is arranged between every two adjacent vibration frames and between the vibration frame on the lowermost layer and the base, and the guide directions of the sliding guide rails are different from one another; each driving mechanism is fixedly connected to the vibration frame located on the lower layer or the base and drives the vibration frame located on the upper layer to do reciprocating rectilinear motion along the corresponding sliding guide rail. Each locking mechanism is arranged between every two adjacent vibrating frames and between the vibrating frames and the base, and each locking mechanism can selectively lock the reciprocating motion of the vibrating frame located on the upper layer; the control unit is in communication connection with all the driving mechanisms and independently controls operation of all the driving mechanisms. The vibration test bench can realize multi-degree-of-freedom movement, and has a broadband vibration frequency / amplitude adjusting function.
Owner:CHINA STATE RAILWAY GRP CO LTD +4
Method and apparatus for synthesizing spatially cross-correlated multi-point ground motions fitting response spectrum
PCT designated stageWO2026077150A1Design optimisation/simulationSeismic signal processingTarget ResponseSynthesis methods
Disclosed in the present invention are a method and apparatus for synthesizing spatially cross-correlated multi-point ground motions fitting a response spectrum. The method comprises: using an influence matrix method to obtain ground motion acceleration time histories fitting a target reaction spectrum with high precision, and calculating a Fourier amplitude spectrum and a phase spectrum thereof; and considering a calculation relationship between a power spectral density function and the Fourier amplitude spectrum, taking the power spectral density function of the obtained time histories as an initial value, using a random vibration theory and Cholesky decomposition to obtain spatially cross-correlated multi-point ground motion time histories, further taking into account a phase spectrum of the ground motion time histories fitting the target reaction spectrum with high precision, and performing correction and iteration to obtain spatially cross-correlated multi-point ground motions fitting a response spectrum. The present invention overcomes the shortcomings in current multi-point ground motion time history synthesis techniques, such as the difficulty in ensuring good fitting to a target response spectrum and the non-stationarity of synthesized ground motions, helping to improve the reliability of dynamic response analysis results for large-scale engineering structures under the action of multi-point ground motions.
Owner:JIANGNAN UNIV
Deep underground structure pseudo-dynamic test method and device
The invention belongs to the technical field of underground structure tests, and provides a deep underground structure pseudo-dynamic test method and device.The method comprises the steps that a numerical substructure and a test substructure are constructed, and an interaction boundary is arranged between the numerical substructure and the test substructure; and compensating the boundary prediction data according to the inertia force compensation coefficient based on the numerical sub-structure in each loading process, and loading the compensated prediction data to the test sub-structure, so that the test sub-structure outputs prediction response data and updates the rigidity of the numerical sub-structure, and determining a target balance force according to the prediction response data based on the numerical simulation substructure, driving a next loading process by using the target balance force, and obtaining a dynamic response rule of the soil-structure system when respective boundaries of the numerical simulation substructure and the test substructure meet displacement coordination and force balance. According to the method, the initial stress state of the deep underground structure can be accurately simulated, and the accuracy of obtaining the mechanical response rule of the underground structure is improved.
Owner:HUNAN UNIV
Wind turbine generator deformation vibration monitoring device based on millimeter wave radar
The invention relates to the technical field of wind power generation, in particular to a wind turbine generator deformation vibration monitoring device based on millimeter wave radar. The core function module comprises a benchmark sensing radar, a blade monitoring radar, a reference beacon, an inertial measurement unit, a data synchronization and acquisition unit and a signal processing unit; a reference beacon fixed on a substrate is detected through a reference sensing radar, an absolute motion vector A of the reference sensing radar is solved, then the absolute motion vector A is converted into an absolute motion vector B of a blade monitoring radar, then data C measured by an IMU (Inertial Measurement Unit) is converted into data D of the blade monitoring radar in a coordinate system of the blade monitoring radar, and the blade monitoring radar can be used for monitoring the blade. The absolute motion vector E of the blade monitoring radar is fused and extracted through an extended Kalman filter, and is finally used for compensating original data of blade measurement by the blade monitoring radar, so that the influence of cabin motion on deformation vibration monitoring is eliminated.
Owner:CHINA RESOURCES WIND POWER (VIETNAM) CO LTD
Ground resonance test suspension device and test method
PendingCN121084632AAircraft components testingVibration testingClassical mechanicsEquivalent stiffness
The invention relates to the technical field of vibration tests, in particular to a ground resonance test suspension device and a test method. The ground resonance test suspension device is provided with a bearing frame body, a hoisting mechanism, a bearing mechanism and a suspension mechanism, the bearing frame body is composed of a bearing supporting column, a cross beam and a longitudinal beam, and the position of the cross beam can be adjusted; a bracket of the bearing mechanism is provided with a bottom beam, an auxiliary supporting beam and a supporting beam, and a flexible air cushion is arranged on the supporting beam. A flexible supporting unit of the suspension mechanism is provided with a main spring rope, an upper hanging scaffold, a lower hanging scaffold and an auxiliary spring rope, and an auxiliary spring rope connecting unit can control the state of the flexible supporting unit. The invention further provides a ground resonance test method which comprises the steps of suspension pretreatment, aircraft suspension and test, and the equivalent stiffness of the suspension mechanism can be adjusted. The aircraft suspension system can adapt to different aircraft sizes and weight distribution, and the equivalent stiffness of the whole suspension system can be adjusted to meet the test support frequency requirement.
Owner:BAI JING HANG XIAN (CHANG ZHOU) KE JI YOU XIAN GONG SI
Smooth processing method for time domain waveform reproduction signal
PendingCN121327333AMachine part testingDesign optimisation/simulationTime domain waveformsSignal processing
The invention relates to the technical field of signal processing, and provides a time domain waveform reproduction signal smooth processing method, which is used for detecting the fatigue durability of automobile parts in a vehicle vibration acquisition system, and comprises the following steps: S1, obtaining the initial impedance of the automobile parts and multiple frames of to-be-reproduced signals; s2, calculating a first frame first driving signal, and smoothing the first driving signal to form a target driving signal; s3, calculating and generating a first driving signal of a corresponding frame based on the to-be-reproduced signal of each subsequent frame and the updated impedance corresponding to the previous stage in sequence, and forming a target driving signal; and S4, performing stress analysis on the multi-frame response signals, quantifying the damage accumulation process of the automobile part under the simulated working condition, and evaluating the fatigue durability of the automobile part. According to the invention, the generation of response pulses can be avoided, and the signal waveform reproduction precision is improved, so that the accuracy of fatigue durability detection of automobile parts is improved.
Owner:CHINA AUTOMOTIVE ENG RES INST +1
Vibration excitation device, vibration excitation system and use method of vibration excitation system
The invention discloses a vibration excitation device, a vibration excitation system and a use method of the vibration excitation device, and relates to the field of engineering structure detection, and the vibration excitation device comprises a supporting frame which is used for being placed on a vibration-excited object; the supporting hinge is arranged on the supporting frame; one side of the lever is rotationally connected with the supporting hinge; the mass block is connected with the other side of the lever and is arranged on the support frame; the actuator is arranged on the supporting frame, and the output end of the actuator is connected with the lever; and the elastic piece is arranged on one side, hinged with the support, of the lever and is connected with the support frame and the lever. According to the vibration excitation device, the elastic force provided by the elastic piece fixedly installed on the supporting hinge side during resonance counteracts the inertia force, the actuator only needs to overcome the damping force, the reverse elastic force provided by the elastic piece can reduce friction damping, and the actuator power of the vibration excitation device is further reduced.
Owner:CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD +2
Method and system for detecting anti-seismic property of fabricated steel-wood composite structure
ActiveCN121298163AAnalysing solids using sonic/ultrasonic/infrasonic wavesMaterial analysis using acoustic emission techniquesInterface wavesGeophysics
The invention relates to the technical field of anti-seismic performance detection, in particular to an anti-seismic performance detection method and system for an assembled steel-wood composite structure, and the method comprises the steps: arranging a multidirectional acoustic emission sensor in a steel-wood structure node area, applying simulated seismic vibration, and synchronously collecting acoustic emission signals; the method comprises the following steps: preprocessing collected acoustic emission signals, dividing the acoustic emission signals into signals corresponding to microcracks and contact slippage, respectively calculating an energy attenuation rate and a phase offset, and constructing a matrix; micro-impact is applied to the steel-wood node through an electromagnetic excitation device, a response signal is collected, resonant frequency is extracted, the drift distance between the resonant frequency and a reference value is calculated, and the severity of interface damage is determined according to the value of the drift distance; the damage correlation index calculation takes the characteristic value of the interface wave propagation characteristic matrix and the resonance frequency drift distance as input, the damage correlation index is calculated through the correlation coefficient, and the damage grade is divided according to the correlation coefficient. And differential characterization of different damage types is realized through the interface wave propagation characteristic matrix.
Owner:CHINA RAILWAY INVESTMENT GRP CO LTD +2
Large-stroke hydraulic vibration horizontal test bench
The invention discloses a large-stroke hydraulic vibration horizontal test bed, which is used for solving the problems of interference, abrasion and easy fatigue fracture of a force transmission component caused by a centering error between a large-stroke hydraulic vibration exciter and a horizontal table board. The test bed comprises a base, a hydraulic vibration exciter, a horizontal table top and a spring plate assembly connecting the base and the hydraulic vibration exciter. A function decoupling design is adopted, wherein a guide rail compensation block with horizontal transverse elasticity is arranged in a guide mechanism between a horizontal table top and a base and is specially used for dynamically compensating centering errors in the horizontal direction; meanwhile, the spring plate assembly is constructed to be composed of multiple layers of stacked spring plates parallel to the horizontal table top, centering errors in the vertical direction are dynamically compensated through bending flexibility of the spring plates in the vertical plane, the working stress is greatly reduced through the multi-layer structure, and the fatigue life is prolonged. By means of the design, unification of high-rigidity excitation force transmission and multi-dimensional dynamic error compensation is achieved, the reliability and precision of equipment are remarkably improved, and the service life of the equipment is remarkably prolonged.
Owner:SUZHOU WEIBO TESTING INSTR CO LTD
Container shipping vibration simulation method, simulation device and simulation system
The invention belongs to the technical field related to energy storage safety, and particularly relates to a simulation method, a simulation device and a simulation system for container shipping vibration. A sea wave spectrum model and a cargo ship model are obtained, and a time domain signal is obtained according to the sea wave spectrum model; defining the time domain signal as fluid excitation, and obtaining a first response signal of a preset acquisition point of the cargo ship model according to the fluid excitation; acquiring a frequency domain sequence according to the first response signal, and calculating and acquiring power spectral density according to the frequency domain sequence; obtaining a container model, and calculating and obtaining a second response signal of the container model according to the power spectral density; whether the container of the current cargo ship meets the safety requirement or not is judged according to the second response signal. Safety simulation is carried out on the energy storage container body during marine transportation, so that mechanical damage caused by design problems during marine transportation of the designed energy storage container is avoided.
Owner:HUIZHOU DESAY INTELLIGENT ENERGY STORAGE CO LTD
Rotary machine domain confrontation fault diagnosis method based on multi-angle feature perception
The invention provides a rotating machine domain confrontation fault diagnosis method based on multi-angle feature perception, and the method comprises the steps: obtaining the original vibration signal data of a rotating machine, and constructing a label source domain data set and a multi-angle feature extraction structure; based on a multi-angle feature extraction structure, performing multi-scale parallel convolution on the original vibration signal by using three time domain branches to obtain a time domain feature vector; performing fast Fourier transform on the original vibration signal by using the three frequency domain branches to obtain a frequency domain feature vector; and splicing the time domain feature vector and the frequency domain feature vector into a fusion feature in the channel dimension, and constructing a domain adversarial learning module based on the fusion feature to perform fault diagnosis. According to the method, the essential characteristics of the signal can be deeply sensed from multi-granularity and multi-mode angles, efficient modeling of non-stationary impact, a periodic mode and a key response position is realized, and the robustness and the cross-domain generalization ability of fault diagnosis are further improved.
Owner:HARBIN INST OF TECH
Ultrasonic welding quality online detection system and method
PendingCN121762147AHigh temporal and spatial synchronizationimprove fidelityMachine part testingAnalysing solids using sonic/ultrasonic/infrasonic wavesVibration measurementEnergy absorption
The invention discloses an ultrasonic welding quality online detection system and method, and belongs to the technical field of laser non-contact measurement. According to the invention, the laser vibration measurement probe is rigidly coupled to the welding head to construct a follow-up-common-optical-path measurement unit, so that synchronous acquisition of vibration signals with zero mass loading is realized; further extracting an attenuation section after welding is finished from the signal, and inverting an equivalent modal damping ratio representing an interface energy dissipation state based on an exponential attenuation model; meanwhile, multi-dimensional physical indexes such as an energy transfer efficiency index Itrans and an input stability index Iin are calculated, and in combination with an energy absorption state index, collaborative fusion is carried out through a weighted fusion formula to obtain a comprehensive quality score; and finally, realizing quality attenuation early warning based on time sequence trend analysis of a scoring sequence. On-line sensing of the deep dynamic state in the welding process is achieved, the early defect recognition sensitivity and the system anti-interference capacity are remarkably improved, and the predictive maintenance capacity of quality degradation is achieved.
Owner:ANHUI ZHIBO PHOTOELECTRIC TECHNOLOGY CO LTD
Comprehensive test box
The utility model discloses a comprehensive test box which comprises a foundation, a downwards-sunken foundation pit is arranged in the foundation, a concrete bearing base body is poured in the foundation pit, and a first buffer layer, a framework layer and a second buffer layer are arranged between the concrete bearing base body and the foundation pit. The first buffer layer, the framework layer and the second buffer layer are all of a cylindrical structure and wrap the circumferential direction and the bottom of the concrete bearing base body, and the framework layer is provided with a supporting part extending upwards in the vertical direction to form a foundation pit; the vibration table is fixedly mounted at the upper end of the concrete bearing base body through a metal base; the bottom of the test box body is provided with a butt joint window, and the butt joint window is fixedly connected to the supporting part in a sealed mode. The utility model has the beneficial effect of solving the technical problem that the connection sealing difficulty of the large-scale vibration table and the box body is large.
Owner:HARDY TECH INT LTD
Method for detecting hidden defect of iron tower based on vibration acceleration
PendingCN121090018ADesign optimisation/simulationConstraint-based CADTransmission towerVibration acceleration
The invention relates to the technical field of iron tower detection, in particular to a method for detecting hidden defects of an iron tower based on vibration acceleration, and the method comprises the steps: building a finite element simulation model of a power transmission tower, carrying out the comparative analysis of modal and vibration response before and after damage, and determining a preliminary point distribution position; performing iron tower damage and health state vibration detection experiments on the experimental power transmission tower, setting damage points, arranging vibration acceleration sensors according to initial point distribution positions, applying unit load, drawing a frequency response curve according to data acquired by the sensors, and analyzing the frequency response curve; and if the analysis result does not meet the requirement on the accuracy of identifying the hidden defect of the power transmission tower, adjusting the point distribution position to obtain a final point distribution position. According to the method, efficient and accurate recognition of the hidden defects of the iron tower is achieved, remote monitoring can be conducted, safety, economical efficiency and operability are achieved, the use cost is lower, reliable technical support is provided for intelligent monitoring of electric power facilities, and the obvious engineering application value is achieved.
Owner:国网黑龙江省电力有限公司牡丹江供电公司 +1
Method and system for monitoring bridge piers based on digital twin, and flow-induced vibration protection device
The present invention belongs to the technical field of bridge protection. In order to solve the problem of how to protect bridge piers from flow-induced vibration (FIV), the present invention provides a method and system for monitoring the bridge piers based on digital twin and a FIV protection device, comprising: an annular steel board and multiple polyurethane boards, an inner wall of the annular steel board is fixedly connected to a structure to be protected, hydraulic devices and multiple energy-dissipation springs are arranged between an outer wall of the annular steel board and the polyurethane boards, and the polyurethane boards are spaced apart. The present invention may reduce or even eliminate the FIV caused by seawater or rivers to the structure to be protected, thereby slowing down the fatigue damage caused by FIV to the structure to be protected.
Owner:SHANDONG UNIV
Vibration excitation method and system based on impedance identification
PendingCN121954387Aprevent overloadImprove transfer efficiencyMechanical oscillations controlVibration testingClassical mechanicsImpedance matching
The invention relates to a vibration excitation method and system based on impedance identification, and the method comprises the steps: carrying out the frequency domain conversion of force-speed data obtained by a displacement closed-loop system, and obtaining the mechanical impedance of a drive point; performing flexibility compensation on the mechanical impedance of the driving point to obtain the real impedance of the structure end; extracting an imaginary part and constructing a matching residual error by using the real impedance of the structure end, correcting the excitation frequency of the current vibration exciter through gradient frequency, and iteratively determining the optimal excitation frequency of the vibration exciter meeting a convergence condition; mechanical active power generated by the vibration exciter is calculated under the optimal excitation frequency, dual-target optimization is carried out on the amplitude of the vibration exciter, and the optimal amplitude with the maximum mechanical active power and the minimum equivalent output of the actuator is obtained; based on the real impedance of the structure end, the matching criterion and the optimal amplitude, variable parameters are introduced to construct a source-side impedance model, a source-side impedance matching frequency domain interval is expanded through slow time mark setting parameters, and mechanical active power generated by a vibration exciter is coupled to a tested structure.
Owner:CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD +2
Clamp group for evaluating influence of installation direction of electric connector on performance of electric connector
Owner:ZHEJIANG SCI-TECH UNIV
Track-bridge system anti-seismic evaluation method, medium and equipment
ActiveCN121302525AGeometric CADDesign optimisation/simulationSeismic displacementEarthquake resistance
The invention relates to the technical field of railway earthquake safety, in particular to a rail-bridge system earthquake resistance evaluation method, a medium and equipment. The method comprises the following steps: establishing a finite element model of a track-bridge system; carrying out nonlinear time-history analysis on the track-bridge system under different working conditions; analyzing control factors of earthquake response of the track-bridge system; establishing a mapping relation between the seismic response of the track structure and the seismic response of the main beam; calculating the earthquake response of the main beam, and evaluating the earthquake displacement response of the track structure; and the anti-seismic evaluation of the track-bridge system is realized. Through the method, the method can be used for all high-speed railway bridge types and rails at present, the anti-seismic evaluation of the rail-bridge system based on the driving performance can be indirectly and quickly realized based on the mapping relation, a large amount of time-consuming and labor-consuming train-rail-bridge system finite element simulation calculation does not need to be carried out, and the calculation efficiency is improved. The efficiency is effectively improved, the cost is reduced, the calculation is simple and convenient, and the calculation result is accurate.
Owner:CENT SOUTH UNIV +2
Method and device for calculating b value of micro-seismic data of rock burst mine
The invention relates to the technical field of coal mine rock burst monitoring and early warning, in particular to a rock burst mine micro-seismic data b value calculation method and device, electronic equipment and a computer readable storage medium, and the method comprises the steps: obtaining original micro-seismic time sequence data of a target monitoring area; preprocessing the original micro-seismic time sequence data to obtain preprocessed micro-seismic time sequence data; performing normalization processing on the preprocessed micro-seismic time sequence data to obtain standardized micro-seismic time sequence data; performing wavelet multi-scale decomposition to obtain a low-frequency approximate component and a high-frequency detail component; carrying out linear fitting by utilizing a Guyden-Ricker law to obtain a multi-scale b-value data set; and constructing and training a long-short-term memory network model, and obtaining a multi-scale b value fusion result as a final b value. Through a wavelet multi-scale decomposition technology, micro-seismic data is adaptively decomposed into components reflecting different time scales, and the limitation of manually setting a single sliding window is eliminated.
Owner:CCTEG COAL MINING RES INST
Vibrating table test method considering time-varying deterioration of anti-seismic property of anchored rock slope
ActiveCN121384373AClimate change adaptationDesign optimisation/simulationEarthquake engineeringTime space
The invention belongs to the technical field of geotechnical engineering disaster prevention and reduction and earthquake engineering tests, and relates to a vibration table test method considering time-varying deterioration of anti-seismic performance of an anchored rock slope. The method comprises the following steps: firstly, constructing a dynamic performance time-varying deterioration model based on an anchoring system interface bonding force and a free section steel bar yield resistance attenuation rule; physical equivalent simulation of interface degradation and component yield resistance reduction is realized by regulating and controlling the proportion of rock mass similar materials and utilizing a graded rigidity anchoring system. The core of the method is that before a vibration table applies seismic waves, attenuation of the anchoring performance of a supporting structure is actively simulated in advance, so that a real evolution path that the bearing capacity of an anchoring system is reduced firstly, slope stress redistribution and accumulated damage are caused, and then sudden seismic loads are suffered is reproduced; the limitation that only the static low bearing capacity is simply simulated in a traditional test is broken through. According to the method, space-time coupling of static time-varying degradation accumulation and transient earthquake dynamic action is effectively achieved, the problems of interface degradation simulation distortion and the like are solved, and a reliable test method is provided for dynamic stability evaluation and reinforcement design of a long-term service anchoring slope.
Owner:DALIAN JIAOTONG UNIVERSITY
Method and device for controlling operation noise of vehicle-mounted head-up display
The invention relates to the technical field of head-up display optimization, in particular to an operation noise control method and device for a vehicle-mounted head-up display, and the method comprises the steps: carrying out the bench noise and vibration testing of a target vehicle-mounted head-up display, so as to collect the body operation noise and vibration data in a bench state; the body operation noise and vibration data in the rack state are compared with a preset threshold value, and under the condition that the body operation noise and vibration data in the rack state are larger than the preset threshold value, motor or vibration isolation optimization is conducted on the target vehicle-mounted head-up display; and under the condition that the body operation noise and the vibration data in the rack state are smaller than a preset threshold value, performing a whole vehicle vibration test on the target vehicle-mounted head-up display to collect vibration data in the whole vehicle state, and optimizing the target vehicle-mounted head-up display according to the vibration data in the whole vehicle state. Therefore, noise generated in the self-checking process of the HUD assembly is effectively reduced, and the sound quality of the whole vehicle is improved.
Owner:CHINA FAW CO LTD
Multi-connected crown blade vibration test device, test system and test method
The invention relates to a vibration test device and a test method. The vibration test device comprises a force bearing frame which is used for being connected with a plane where a test is located; the torque loading device is used for being connected with the top of the multi-connected shrouded blade, and the torque loading device can move in the circumferential direction of the multi-connected shrouded blade; the mounting base is used for being connected with the bottom of the multi-connected shrouded blade, and the mounting base can move in the radial direction of the multi-connected shrouded blade; wherein the mounting base is used for receiving centrifugal force loading, and the blade body part of the multi-connected shrouded blade is used for receiving vibration loading.
Owner:AECC COMML AIRCRAFT ENGINE CO LTD
Multi-station integrated circuit vibration testing device
The invention belongs to the technical field of integrated circuit testing, and particularly relates to a multi-station integrated circuit vibration testing device. Comprising a device body and further comprises a plurality of steel jackets, and the steel jackets used for installing testing clamps of different specifications are distributed on the four side faces and the upper surface of the device body respectively. The center of the upper surface of the device body is provided with the cylindrical groove cavity used for placing a sensor; and the locking screw holes are circumferentially distributed in the outer side of the cylindrical groove cavity, and the multiple locking screw holes penetrating to the lower surface are formed in the upper surface of the device body and used for locking and fixing the device body to a vibration table. According to the invention, a plurality of standardized steel sleeves are densely arranged on the side surface and the upper surface of the device body, so that the device can be simultaneously provided with a plurality of clamps with different specifications, thereby supporting the synchronous vibration test of integrated circuits with various packaging forms.
Owner:58TH RES INST OF CETC
Drill rod signal transmission monitoring control method
PendingCN121539266AThermometer applicationsMagnitude/direction of magnetic fieldsVibration amplitudeSignal quality
The invention discloses a drill rod signal transmission monitoring control method, which comprises the following steps: capturing drill rod axial vibration waveform and peripheral magnetic field vector change data in real time, analyzing and marking potential resonance frequency points, calculating magnetic field intensity break variable, and judging a geomagnetic anomaly region; determining the relevance between a resonance frequency point and geomagnetic mutation through time alignment processing, and separating and coupling interference signals; generating an anti-phase damping wave according to the resonance frequency point, dynamically adjusting the amplitude, and injecting a pre-compensation phase to counteract carrier offset; the signal-to-noise ratio and the phase error after suppression are calculated in real time, and a parameter readjustment process is triggered to ensure the suppression effect; when the rock drilling vehicle enters a new rock stratum, parameters are automatically recorded and updated to adapt to different rock stratum interference characteristics; the drilling stability and the signal quality are obviously improved, and the equipment loss and the maintenance cost are reduced.
Owner:CHINA RAILWAY 12TH BUREAU GRP CO LTD +3
Physical simulation method and equipment for seismic response certainty of urban underground rail transit network
The invention discloses a physical simulation method and device for seismic response certainty of an urban underground rail transit network, and the method comprises the steps: constructing a mixed seismic source model based on the active fault parameters and kinematic parameters of a target region, the seismic source model integrates a low-wavenumber deterministic slip component and a high-wavenumber random slip component on a fault fracture surface to generate a broadband seismic wave field source reflecting the physical process of a seismic source; the constructed seismic source model is used as input, a regional crustal velocity structure model is combined, propagation of seismic waves in a layered geological medium is simulated through a frequency-wavenumber domain method, and a seismic oscillation space-time field is obtained through calculation; and establishing a finite element model of the urban underground rail transit network, applying the seismic oscillation time-space field as non-consistent seismic oscillation input to the finite element model, and solving through dynamic time-history analysis to obtain the dynamic response of the whole underground rail transit network in the earthquake process. According to the invention, a complete physical chain from seismic source fracture to structural response can be reproduced.
Owner:TIANJIN UNIV
Positioning execution mechanism for swing inclination test of marine equipment
The invention relates to the technical field of ship equipment swing inclination tests, in particular to a positioning execution mechanism for ship equipment swing inclination tests, which comprises two symmetrically distributed fixed bottom plates, two connecting frames are fixedly mounted on the upper sides of the fixed bottom plates, and mounting blocks are fixedly mounted on the corresponding sides of the two connecting frames. A rotating tooth block is engaged with a first adaptive rack, a first sliding block and a second adaptive rack at the bottom of the first sliding block are driven to reciprocate, the second adaptive rack is engaged with a tooth groove in a second rotating shaft, and finally, the rotating motion of a first rotating disc is accurately converted into preset-angle reciprocating swing of the second rotating shaft; according to the series of transmission structures, continuous rotation of the motor is converted into accurate swing output, the swing amplitude of the swing rod can be linearly controlled by controlling the rotation angle of the motor, high-precision amplitude setting capacity is provided for tests, and the defects that the swing amplitude of a traditional mechanism is difficult to adjust and low in precision are overcome.
Owner:大连石岛工业有限公司
Wind wave flow-earthquake coupling load simulation device and method for offshore wind power system
The invention discloses a wind wave flow-earthquake coupling load simulation device and method for an offshore wind power system, and relates to the technical field of offshore wind power. The device comprises a comprehensive simulation platform, a model installation area and a data acquisition and monitoring system, wherein the comprehensive simulation platform cooperatively simulates a wind wave flow and an earthquake coupling load through a rectangular water tank, a vibration table system, a wave maker system and a water flow driving device; the model installation area is provided with special installation structures matched with multiple types of foundations such as pile foundations and jacket foundations, and multiple types of sensors are arranged in a matched mode. And the data acquisition and monitoring system realizes data acquisition, analysis and image recognition. According to the method, system safety evaluation is completed through model preparation, coupling load application and data acquisition and analysis. The problems that an existing device is single in simulation and poor in adaptability are solved, and an accurate and reliable experiment means is provided for stability research of an offshore wind power system.
Owner:TIANJIN UNIV