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50 results about "Failure zone" patented technology
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Catheter sleeve assembly and one step injection molding process for making the same
InactiveUS6887417B1Inexpensive and comfortable and safe catheter insertionReduce manufacturing costGuide needlesCatheter introducerInjection molding process
An enhanced catheter introducer and method for making the same are disclosed. The catheter introducer may have a splittable sleeve assembly configured to be inserted into a blood vessel with a cannula. The cannula may then be removed, and a catheter may be inserted into the sleeve assembly. The sleeve assembly may be removed from the catheter by pulling handles of the sleeve assembly in different directions to split the sleeve assembly into two pieces. The sleeve assembly may have failure zones that enable the sleeve assembly to be easily split; the failure zones may take the form of thinned regions running along the length of the sleeve assembly. The sleeve assembly may be injection molded with a single step by injecting flows of molten plastic into a cavity of a mold such that the flows converge into an even distribution about the circumference of the sleeve. The mold may have a core pin designed to fit into the cavity. Through the use of the even distribution of flows, the core pin may seat within the cavity in an untensioned manner.
Owner:BECTON DICKINSON & CO
Electronic map aided inertial navigation method in GPS dead zone
InactiveCN101696886AHigh precisionImprove reliabilityInstruments for road network navigationNavigation systemMap matching
The invention discloses an electronic map aided inertial navigation method in a GPS dead zone, relates to the technical field of navigation and solves problems of low system precision and poor reliability in a GPS failure zone where the prior vehicle-mounted SINS / GPS integrated navigation system is positioned. The method comprises the following steps of: firstly, determining an error area range matching with the map and searching for a candidate road section; secondly, judging whether a vehicle is in a crossing turning state or not, if the vehicle is not in the crossing turning state, using a matching degree weighting recursion-based map matching method to determine the best matching position of the vehicle, and if the vehicle is in the crossing turning state, using a related coefficient-based map matching method to determine the best matching position of the vehicle; and finally, using the best matching position of the vehicle, which is obtained by map matching, to aid a strapdown inertial navigation system to combine and correct position. By combining the prior navigation method, the method of the invention effectively improves the precision and the reliability of the vehicle-mounted SINS / GPS integrated navigation system.
Owner:HARBIN INST OF TECH
Train combined positioning method under condition of limited satellite signal
ActiveCN108196289ASolve the positioning problemGuaranteed continuityNavigation by speed/acceleration measurementsSatellite radio beaconingNavigation systemMarine navigation
The invention provides a train combined positioning method under a condition of a limited satellite signal. The method can revise bias of an inertial navigation system by using position information provided by a satellite navigation system under the condition of effective satellite positioning, combines train gesture information with output parameter of a wheel sensor, calculates to obtain three-dimensional speed under a navigation coordinate system and reserves information of satellite unlocking. Under the condition of satellite positioning failure, a wheel sensor / inertial navigation systemis applied to combine and position; a wheel sensor is applied to revise the bias of the inertial navigation system, thus the train combination navigation system can provide positioning information with a certain precision. A high-precision digital track map is used for revising the bias of the train on the track vertical direction, thus the positioning precision of the train is guaranteed. The method can solve the positioning problem of the failure zone of the satellite signal, and carry out system independent switching under different satellite positioning conditions, thus the continuous, exact and reliable train position information can be acquired.
Owner:BEIJING JIAOTONG UNIV
Horizontal triaxial tension and compression tester
InactiveCN101614638AImprove integrityGuaranteed integrityMaterial strength using tensile/compressive forcesData acquisitionEngineering
The invention relates to a horizontal triaxial tension and compression tester comprising an AC machine arranged on a test platform. The power output end of the AV machine is connected with a rigid load bar on which a force sensor is arranged; the rigid load bar is connected with a front piston rod; the front piston rod is also provided with a displacement sensor; the force sensor, the displacement sensor and a data acquisition board are connected with a computer; the other end of the front piston rod is connected with a sample cap after passing through a front baffle board, and the sample cap is connected with an air exit hole on the front baffle board by a plastic soft tube; the other end of a rolling bearing on a horizontal stand is also provided with a sample cap which is connected with a rear piston rod; the rear piston rod is connected with a fixed baffle board after passing through a rear baffle board; the AC machine is started, and then an acquisition program carries out real-time acquisition and preserves output values of the force sensor and the displacement sensor; a drain hole is opened, and then a sample is removed after water is completely discharged; and subsequently, the width of a sample tension failure zone is measured. The invention has the characteristics of good integrity, high stability of loading and high axial rigidity.
Owner:TSINGHUA UNIV
Manufacturing of decorative workpieces by inkjet
ActiveUS20160347085A1Quick responseFast preparationSpecial ornamental structuresTypewritersEngineeringFailure zone
A method for manufacturing decorative workpieces includes the step of nesting a set of decorative patterns digitally printed on a decoration layer to reduce the waste of decoration layer. To perform a corresponding relief for the nested decorative patterns on a nested decorative workpiece, the relief provided by a digital relief apparatus is in a correct match with the nested decorative workpiece. If the printing zone of the digital printer has a failure zone, the nesting method prevents arranging of the decorative patterns in this failure zone.
Owner:AGFA NV +1
Cable mixed circuit failure zone identification method adopting line model current for PCA cluster analysis
ActiveCN104155575AAccurate judgmentReliable judgmentFault locationGround failureElectric power system
The invention relates to a cable mixed circuit failure zone identification method adopting line model current for PCA cluster analysis and belongs to the field of electric power system ranging technology. The method comprises the following steps: failure initial line model current travelling wave data of a cable mixed circuit positioned at the beginning end of an overhead line of a measuring end is extracted for PCA cluster analysis; when a failure occurs, the failure initial line model current travelling wave data detected by the measuring end is subjected to PCA cluster analysis to obtain the projection value q 1 of the data on a PC 1 coordinate axis; according to the projection value positioned at the positive semi-axis and the negative semi-axis of the PC 1 coordinate axis, the situation that whether the failure occurs in a cable zone or the overhead line zone can be decided; if q 1 is less than 0, the failure occurs in the overhead line; if q 1 is greater than 0, the failure occurs in a cable circuit. According to the method, the failure initial line model current travelling wave is adopted to position the single-phase ground failures occurred in the cable mixed circuit, evidences are provided for the follow-up travelling wave positioning and the simulation indicates that the method can accurately and reliably detect the failure zone of the cable mixed circuit.
Owner:KUNMING UNIV OF SCI & TECH
Bottom plate mining failure zone segmental observation method
InactiveCN106595986AReduce the number of movesImprove stabilityMeasurement of fluid loss/gain rateWater leakageObservation system
The invention discloses a bottom plate mining failure zone segmental observation method, belonging to the technical field of mine bottom plate rock mass failure scope determination. The observation method includes the steps of boring a detection hole, installing an observation system, expanding all of the plugging capsules, determining the water leakage amount parameters, and pressure-releasing and draining the plugging capsules. The plugging system in the observation system includes plugging outer pipes, a capsule water inlet switch, plugging capsules, and a slip sleeve, the top part of the plugging outer pipe between the adjacent plugging capsules is provided with a drain hole, the detection inner pipes in the detection system are arranged inside the plugging outer pipes and perform relative sliding in the plugging outer pipes, and the capsule water inlet switch is arranged on the plugging outer pipe at the outermost side of the plugging capsules. The expansion of all of the plugging capsules can be realized by the water filling in one step, the one-time plugging multi-section successive measurement of the observation system can be realized, the measuring efficiency is improved, and the power supply determination integration of a single system can be realized.
Owner:SHANDONG UNIV OF SCI & TECH
Multi-block slide calculation method for giant landslide
ActiveCN105069248AOvercoming the plastic zone is enlargedOvercoming featureSpecial data processing applicationsMassifNumerical models
The invention relates to a multi-block slide calculation method for a giant landslide, and belongs to the field of geological disaster engineering. The method is used for landslide disaster stability evaluation and engineering prevention and control. The method comprises the steps of: (1) finding out a landslide region range, deformation features and hydrogeology and engineering geology conditions; (2) based on a finite element program, establishing a finite element numerical model of a side slope; (3) inputting formation mechanical parameters of the side slope; (4) inputting reduction parameters and physical and mechanical characters of landslide massif for performing finite element calculation; (5) determining a side slope failure region; (6) continuously reducing failure strength parameters until slide surfaces are communicated; (7) determining a tension failure zone of each stage of slide surface; (8) setting the tension failure zone as a null unit in the model; and (9) re-calculating a new numerical model and searching out multiple stages of slide surfaces. According to the multi-block slide calculation method for the giant landslide, provided by the invention, the multiple stages of slide surfaces of the giant landslide can be accurately searched out and an important basis is provided for giant multi-stage landslide stability evaluation and engineering prevention and control.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Method for rapidly positioning short circuit of three-dimensional memory array zone
ActiveCN107993951AQuickly achieve positioningQuickly achieve characterizationSemiconductor/solid-state device testing/measurementMemory arrayFocused ion beam
The invention provides a method for rapidly positioning short circuit of a three-dimensional memory array zone, which includes steps of processing a to-be-tested sample to a tungsten plug layer; marking a failure zone block of the processed to-be-tested sample by a focusing ion beam machine table; applying a certain voltage to the tungsten plug of a step zone through a nano-point needle table, andfinding out a failure path between an array zone word line layer and the word line layer or between the word line layer and a source electrode; applying the focusing ion beam machine table to draw out a line at the tungsten plug of the step zone corresponding to the failed word line layer; then depositing a metal cushion body at the tail end of the line; applying a certain voltage to the metal cushion body through a micro-light microscope and thereby highlighting the hot spot signal at the failure place; marking a laser mark at the failure point; performing section cutting on the laser marking place by the focusing ion beam machine table while observing the failure point, and preparing a transmission electron microscopy test block; representing the test block by the transmission electronmicroscopy. The method can rapidly position and represent the short circuit point of the word line layer.
Owner:YANGTZE MEMORY TECH CO LTD
Mixed line self-adaptive reclosing method based on traveling wave ranging principle
InactiveCN102064539AImprove power supply reliabilityImprove power supply stabilityEmergency protective arrangements for automatic disconnectionEngineeringSelf adaptive
The invention provides a mixed line self-adaptive reclosing method based on a traveling wave ranging principle, which comprises the following steps of: (1) representing both ends of a mixed line by M and N, wherein M is a cable end bus, and N is an overhead line end bus; calculating line total length L after wave velocity reduction; (2) measuring a difference of time (delta t) spent in surging line failure initial traveling wave to the buses at both ends and calculating distance DMF or DNF between a failure point and any end of a line after wave velocity reduction; (3) confirming a failure zone according to the DMF or DNF; and (4) when the failure point is positioned in the overhead line zone, starting reclosing by a line protecting device after line failure is cut off; and otherwise, locking reclosing. The method realizes mixed line self-adaptive reclosing, improves the power supply reliability and has wide application prospect.
Owner:STATE GRID SICHUAN ELECTRIC POWER +1
Strong-side and strong-corner coal entry anchor rod support method
InactiveCN101915112AIncrease the speed of excavationImprove stabilityAnchoring boltsEngineeringRock bolt
The invention discloses a strong-side and strong-corner coal entry anchor rod support method. The anchor bolt support comprises a plurality of top anchor rods and top anchor cables which are arranged on a roadway top plate, and a plurality of side anchor rods and side anchor cables which are arranged on the side wall of a roadway. In the plurality of top anchor rods and top anchor cables, the top anchor rods and the top anchor cables close to both sides of the roadway are respectively inclined for 15-30 degrees towards the outer side of the roadway; and in the plurality of side anchor rods and side anchor cables, the side anchor rods and the side anchor cables on the upper most layer are upwards inclined for 15-30 degrees, and the side anchor rods and the side anchor cables on the lower most layer are downwards inclined for 15-30 degrees. The invention greatly improves the support effect of the coal entry and the integral stability of the roadway, reduces the deformation and the plastic failure zone of the roadway, guarantees the safety of the roadway, reduces the cost and the maintenance difficulty of the roadway support and improves the advance rate of the roadway.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
Slope progressive failure whole process calculating method
ActiveCN106503421AAddress stressResolve continuitySpecial data processing applicationsPeak valueStressed state
The invention provides a slope progressive failure whole process calculating method. The calculating method includes: calculating random stress and strain of a material whole process main stress-strain in the hypothesis that the geological material whole process main stress-strain meets a relevant constitutive relation; acquiring the stress and a strain value in random stress state through coordinate transformation and the characteristic that reversible strain and irreversible strain are irrelevant; generating leftover gliding force due to reduction of frictional resistance of a failure zone in the condition that a slide face failure meets a certain peak stress principle, increasing normal stress a slide body front unit and drive shearing stress along a slide surface, and then causing failures of a slope progressively forward; and determining a relative strain value of both the slide body and a slide bed by calculating the slide body unit strain on the slide surface, and calculating the frictional resistance of a slide surface according to the strain value. The slope progressive failure whole process calculating method can directly calculate the shearing stress and the shearing strain of the slide surface, can avoid deformation coordination hypothesis among blocks, and can calculate the stress and the strain of the slide body.
Owner:SOUTHWEST JIAOTONG UNIV
System and method for monitoring reserved coal pillaralong-goaf remained gateway floor crack development
ActiveCN106223931AReasonable structural designSafe and stable drillingSurveyConstructionsButt jointDrill site
The invention discloses a system and method for monitoring reserved coal pillaralong-goaf remained gateway floor crack development. A floor drill site is dug in one side of a reserved coal pillaralong-goaf remained gateway, different depths of drilling is conducted on a floor, and a butt joint sealing system is adopted to deliver transparent hollow pipes to drill holes in a section-by-section butt joint mode; after casting is conducted in gaps between the drill holes and the transparent hollow pipes for anchorage, a detecting and positioning assembly is utilized to record surrounding rock gaps of the drill holes at different positions on a measuring ruler, and floor's mining fracture law evolution monitoring tasks are carried out at different mining stages for multiple times till data trends to stable observation finishing. According to the method, floor shallow part drill holes, floor middle deep drill holes and floor deep part drill holes extending from the floor drill site to the mining coal floor and arranged side by side are arranged in a stereo mode, the middle floor plastic failure zone developmental morphology during mining and floor failure zone developmental morphology can be delineated by observing the adjacent drill holes and the gap situations of the same drill holes at different coal mining stages at the same time, and reliable data reference can be provided for safe construction.
Owner:中国平煤神马控股集团有限公司 +2
GaN-based semiconductor laser chip detecting device and method
ActiveCN108318800ASimple structureVersatileElectronic circuit testingMicroscopic imageCatastrophic optical damage
An embodiment of the present invention provides a GaN-based semiconductor laser chip detecting device and method. The device comprises a chip loading module, a power supply module, a microscopic imaging module and a laser marking module. By the power supply module, a certain current is applied to a chip to be detected such that the chip to be detected emits two fluorescences from a p-plane and a front cavity surface, the microscopic imaging module receives the two fluorescences and performs fluorescence imaging on the p-plane and the front cavity surface of the chip to be detected and judges whether an active area of the chip to be detected has a failure zone and whether the front cavity surface has a catastrophic optical damage point, and finally, the p-plane directly above the failure zone of the active area of the chip to be detected is marked by the laser marking module for subsequent processing. The device has a simple structure and can mark the p-plane region directly above thefailure zone of the active region of the chip to be detected, thus the location of the failure zone in the active region is determined, functions are rich, and the device has a good practical value.
Owner:BEIJING UNIV OF TECH
Method for determining widths of partition coal pillars at slope based on creep test of coal sample
The invention provides a method for determining the widths of partition coal pillars at a slope based on the creep test of a coal sample. The method comprises the following steps: acquiring a coal sample and determining the time of one stoping; with the time of one stoping as destroy time of the coal sample on a testing machine, setting normal stresses of different grades, setting horizontal stresses by using the Cheng' step loading method, carrying out creep fracture test on the coal sample within the time of one stoping, acquiring a creep stress-strain curve of the coal sample and a series of shear fracture strength data under the action of the normal stresses of different grades, and recording target time strength of the coal sample; subjecting the target time strength under the action of the normal stresses of different grades to fitting and determining the cohesive force and internal friction angle of the coal sample according to a fitting curve and Mohr' strength equation; setting the width range of the coal pillars, and simulating the vertical stress field distribution rule and plastic failure zone distribution rule of the coal pillars under the conditions of different coal pillar widths by using FLAC3D software according to the determined cohesive force and internal friction angle of the coal sample; and carrying out contrastive analysis so as to obtain the proper width range of the coal pillars.
Owner:扎鲁特旗扎哈淖尔煤业有限公司
Light guide plate making method for improving color gamut and yield, light guide plate and backlight module
ActiveCN106443870AImprove yieldImprove color gamutLight guides with fluorescent dopantsPlanar/plate-like light guidesPolyesterGamut
The invention provides a light guide plate making method for improving color gamut and yield. The light guide plate making method for improving the color gamut and yield comprises the following steps: firstly, blending yellow fluorescent powder ink; then, according to the range of high color gamut failure zone of the backlight module, plate-making lattice points to be a steel wire net or a polyester net, designing the lattice points from outside to inside and from large to small, coating the blended yellow fluorescent powder ink on the steel wire net or the polyester net, printing on the incident light surface of the light guide plate by a printer, and solidifying the yellow fluorescent powder ink on the light guide plate by a baking oven IR; and then, according to the range of the visual zone of the backlight module, designing the lattice points of dots or lines, and inputting to a laser machine computer, setting the variation tendency of the light energy, and performing the laser dotting to the light guide plate printed with the yellow fluorescent powder ink. The light guide plate making method is capable of improving the color gamut of the backlight module, the optical brightness is not affected, and the product yield is greatly improved.
Owner:青岛国骐光电科技有限公司
Quick-loosening mechanical linking device
A quick-loosening mechanical linking device that includes housing, a release cavity having a predetermined height, a bolt, and an actuator. The bolt is disposed within the housing and includes an attachment means projecting out from the housing, a release zone such as an intended failure zone, and a head with a piston face. Upon actuation of the actuator, the bolt deforms and / or fails at the release zone and the attachment means moves farther out from the housing by a distance equal to the height of the release cavity. The release cavity preferably includes an abutment formed at its bottom, and the actuator is preferably an electric initiator having a pyrotechnic charge.
Owner:DAICEL CHEM IND LTD
Layout method of coal seam gas extraction engineering
The invention provides a layout method of coal seam gas extraction engineering, which comprises layout steps of ground surface extraction engineering, layout steps of downhole coal seam roof extraction engineering and downhole coal seam floor extraction engineering, wherein the layout steps of the ground surface extraction engineering include observation and analysis of ground surface movement parameters, calculation of a ground surface movement scope of a coal excavation working face, and layout of the ground extraction engineering of coal seam gas in an area with small ground movement deflection according to calculation results; at the layout steps of the downhole coal seam roof extraction engineering, development heights of a caving zone and a fractured zone are determined according to overburden failure rules, and the downhole coal seam roof extraction engineering of the coal seam gas is laid in the middle lower part of the fractured zone above the caving zone; and at the layout steps of the downhole coal seam floor extraction engineering, a development depth of a floor failure zone is determined according to floor mining facture rules, and the downhole coal seam floor extraction engineering is laid in a complete rock layer zone in the lower part. The layout method of the coal seam gas extraction engineering is advantageous in that extraction effects can be improved, and the ground surface and downhole extraction engineering can be maintained more easily, so that maintenance cost is reduced.
Owner:TIANDI SCI & TECH CO LTD
A Removable Car Seat Cover Having A Predetermined Pre-Weakened Failure Zone Of A Known Bursting Strength For Facilitating Reliable Airbag Deployment
ActiveUS20170072822A1Reliable deploymentAvoid problemsSeat coveringsPedestrian/occupant safety arrangementBursting strengthLateral airbag
A removable car seat cover for a car seat having an integral side airbag including a side panel having a predetermined pre-weakened failure zone that is pretreated by controlled laser ablation of the side panel. The pre-weakened failure zone is located at or adjacent to an airbag deployment area of a car seat when the car seat cover is installed on the car seat, and is in the form of an elongate strip extending along the side panel. The pre-weakened failure zone has a known bursting strength to thereby facilitate reliable deployment of the side airbag from the car seat as a result of tearing of the pre-weakened zone when the removable car seat cover is installed thereon.
Owner:CUSTOM ACCESSORIES
Manufacturing of decorative workpieces by inkjet
ActiveUS9840091B2Reduce wasteMaximizing numberSpecial ornamental structuresTypewritersEngineeringFailure zone
A method for manufacturing decorative workpieces includes the step of nesting a set of decorative patterns digitally printed on a decoration layer to reduce the waste of decoration layer. To perform a corresponding relief for the nested decorative patterns on a nested decorative workpiece, the relief provided by a digital relief apparatus is in a correct match with the nested decorative workpiece. If the printing zone of the digital printer has a failure zone, the nesting method prevents arranging of the decorative patterns in this failure zone.
Owner:AGFA NV +1
Method for processing lightweight orthopedic stent
ActiveCN108707744AImprove fatigue lifeNo reduction in fatigue lifeFurnace typesHeat treatment process controlProcessing InstructionLaser peening
The invention discloses a method for processing a lightweight orthopedic stent. The method comprises the steps that the orthopedic stent is tested according to a structural parameter of the orthopedicstent and a load spectrum of a stent service interval to determine a fatigue life before strengthening of the orthopedic stent; mechanical analysis is performed on the orthopedic stent to determine afailure zone so as to perform laser peening treatment on the failure zone of a sample stent; the fatigue life of the sample stent after strengthening is tested and a preferred thickness is determinedaccording to the fatigue life before strengthening and the fatigue life after strengthening; a processing instruction is generated according to the preferred thickness so as to process the orthopedicstent with the preferred thickness as a processing thickness and perform laser peening treatment on the failure zone to obtain the lightweight orthopedic stent. The method can further reduce overalldimensions of the orthopedic stent without reducing the fatigue life of the orthopedic stent.
Owner:GUANGDONG UNIV OF TECH
Connection history-based retry throttling
PendingCN111294759ANetwork traffic/resource managementParticular environment based servicesData miningTelematics
A telematics controller is programmed to identify a location responsive to detecting a failed data call from a vehicle, and if the location is within a geographic boundary of a failure zone within a cellular tower region and a cause of the failure matches a recorded cause for the failure zone, initiate data throttling until the vehicle moved outside of the geographic boundary.
Owner:FORD GLOBAL TECH LLC
Mining coal seam floor damage depth monitoring method
ActiveCN114397421AScientific risk predictionScientific Safety PredictionEarth material testingUsing optical meansMining engineeringMonitoring methods
The invention relates to the technical field of coal seam floor damage depth monitoring, and provides a mining coal seam floor damage depth monitoring method which comprises the following steps: determining a water guide damage zone according to fracture development conditions and water guide properties before and after coal seam floor recovery, and determining a stress-strain zone according to strain change conditions before and after coal seam floor recovery, determining a physical property difference zone according to the physical property change condition before and after the coal seam floor is stoped; and monitoring the damage depth of the coal seam floor during mining according to the water diversion damage zone, the stress-strain zone and the physical property difference zone. The coal seam floor can be divided into a water guide failure zone, a stress-strain zone and a physical property difference zone through a point-line-plane full-space and multi-parameter cooperative monitoring mode, the influence degree of the coal seam floor during mining can be analyzed, the failure condition of the coal seam floor can be monitored, and the coal seam floor can be protected from being damaged by the water guide failure zone, the stress-strain zone and the physical property difference zone. And scientific risk prediction, safety prediction and water disaster prevention and control schemes can be formulated.
Owner:CCTEG COAL MINING RES INST +1
Lubrication oil failure alarm display device
The invention relates to a lubrication oil failure alarm display device. When lubrication oil enters a failure zone, an oil dipstick ultraviolet sensor can start an alarm circuit and a display device to display a lubrication oil state. When a detection switch is opened, lubrication oil performance situations can be known at any time. The lubrication oil failure alarm display device of a power generator set effectively prevents an engine from being pulled and abraded artificially and prevents the service life of the engine from being shortened.
Owner:何良智
Method for evaluating loading capacity of complete bottom plate during under-pressure mining
PendingCN114659898AThe principle of stress is simpleThe evaluation result is accurateMaterial strength using tensile/compressive forcesPorosityRock sample
The invention discloses a method for evaluating the pressure-bearing capacity of a complete bottom plate mined under pressure. The method comprises the following steps: (1) determining the damage depth of the bottom plate; (2) determining whether a floor failure zone has affected an aquifer and causes unsafe mining or not, and otherwise, performing evaluation by adopting steps (3)-(8); (3) determining the position of a specific water-containing rock stratum, coring, and obtaining the porosity n of the water-containing rock stratum; (4) acquiring tensile strength values of the rock samples of the water-containing rock stratum, the overlying rock stratum of the water-containing stratum and the contact zone of the water-containing stratum and the overlying rock stratum; (5) obtaining a top plate water pressure value of the water-containing rock stratum; (6) solving the effective water pressure of the water-containing rock stratum; (7) solving effective tensile strength, and determining the minimum effective tensile strength; (8) calculating a water inrush safety coefficient e; the principle is simple, application is convenient, and evaluation results are more accurate.
Owner:CHINA UNIV OF MINING & TECH
Water-rich fault tunnel face water inrush evolution simulation test device and method
InactiveCN113030400AReveal the law of time and space evolutionMaterial analysisMonitoring siteInformation monitoring
The invention discloses a water-rich fault tunnel face water inrush evolution simulation test device and method, and belongs to the field of underground construction engineering simulation. The water-rich fault tunnel face water inrush evolution simulation test device comprises a water pressure loading system, a simulation box body, simulation soil layers laid in the simulation box body in a layered mode, an information monitoring system and a simulation tunnel excavation system. The water pressure loading system firstly adds water into a pressurizing tank and then injects air to achieve a pressure maintaining effect, and constant pressure stability of the information monitoring system is guaranteed; and the information monitoring system comprises a plurality of stress monitoring points, and the stress monitoring points are evenly distributed around the simulated fault and the simulated tunnel and used for monitoring the dynamic deformation process. The device is used for simulating the conversion process among the thicknesses of the disturbance failure zone, the effective water insulation zone, the induced fault zone and the fault failure zone. Multi-field coupling of a stress field, a seepage field, a displacement field and the like in the tunnel water inrush process can be obtained, and mechanical characteristics and evolution laws in the tunnel rock mass structure progressive failure process are disclosed.
Owner:ZHENGZHOU INST OF TECH
A method for measuring solid-liquid two-phase flow in water pump system based on Echo-PIV
ActiveCN109242871AHigh precisionHigh measurement accuracyImage enhancementPump testingSonificationMeasurement precision
The invention provides a method for measuring solid-liquid two-phase flow in water pump system based on Echo-PIV. The procedure is as follows: establishing a visual pump system suitable for Echo-PIV Measurement; correcting Echo-PIV particle image cross-correlation algorithm ,based on multi-iteration algorithm and sub-pixel edge detection method, by combining with filtering and two-line interpolation function, eliminating pseudo-vector; establishing Echo-PIV velocity correction formula; using BEM-based inversion algorithm to modify velocity vector of Echo-PIV measurement failure zone; analyzingThe influence of ultrasonic scanning depth and angle on Echo-PIV measurement results; determining optimal query region scope of solid-liquid two-phase flow Echo-PIV measurement in pump system; basedon contour wavelet transform algorithm, establishing pump system Echo-PIV image boundary extraction method; based on Echo- PIV, testing and measuring the solid-liquid two-phase flow in the pump system, and analyzing the mechanism of solid phase movement in the pump system under different particle size and different volume fraction. The invention not only can accurately measure the solid-liquid two-phase flow rule in the pump system, but also can improve the efficiency of Echo-PIV measurement accuracy.
Owner:JIANGSU UNIV ZHENJIANG RES INST OF FLUID ENG EQUIP TECH +1
Multi-block sliding calculation method for giant landslides
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Removable car seat cover having a predetermined pre-weakened failure zone of a known bursting strength for facilitating reliable airbag deployment
ActiveUS10532676B2Reliable deploymentAvoid problemsSeat coveringsPedestrian/occupant safety arrangementCar seatLateral airbag
Owner:CUSTOM ACCESSORIES
Segmented observation system for mining failure zone of mine roof bottom plate
ActiveCN108643900ARealize the integration of plugging testImprove stabilityBorehole/well accessoriesWater sourceWater leak
The invention belongs to the technical field of rock mass failure range measuring, and discloses a segmented observation system for a mining failure zone of a mine roof bottom plate. The segmented observation system comprises a testing probe, a drilling rig, a drilling rod and a control operating table. The testing probe comprises a front plugging device, a tail plugging device, a converter and acommunicating pipe. The plugging devices comprise water leaking pipes, connectors and rubber bags, wherein the connectors and the rubber bags are connected to the two ends of the water leaking pipes.The rubber bags wrap the peripheries of the water leaking pipes in a surrounding mode, a plugging cavity is formed between each rubber bag and the corresponding water leaking pipe, and an external water source is injected into the plugging cavities to expand the rubber bags to form water injecting cavities with drill holes. A testing device can complete the plugging process and the testing processthrough the same external water source, high and lower hydraulic pressure variable control is achieved, it is guaranteed that the plugging process and the testing process are executed under the pressure required by the plugging process and the testing process, the winding problem of the drilling rod and a hose is avoided, operation steps are reduced, the number of workers is decreased, and the propulsion measuring efficiency is improved.
Owner:DALIAN UNIV OF TECH
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