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4636 results about "Safety coefficient" patented technology

Coefficient of safety. Determination of the corresponding coefficient of safety is a complicated and responsible task. A high coefficient of safety usually results in a safer design, however with a higher weight and thus a higher price and vice versa.

Vehicle autonomous parking path programming method used for multiple parking scenes

The invention provides a vehicle autonomous parking path programming method used for multiple parking scenes. The method is used for automatically parking a vehicle in a parking space through an autonomous parking system when the autonomous parking system detects the available parking space. The method includes the steps that target parking space information is detected, and a parking scene is determined; the initial state and target state of the to-be-parked vehicle are determined; a vehicle kinematics differential equation is established; state variables and control variables of the vehicle are segmented, equidistance sampling is performed on each segment according to certain time step, and to-be-optimized variables are obtained; an equality constraint, boundary constraints and inequality constraints of the to-be-optimized variables are formed; motion range constraints of the to-be-parked vehicle are formed according to the motion range limit in the parking process of the vehicle; an optimization objective is determined, and an objective function is established; and by means of a nonlinear programming solver, an optimal solution of a parking path is obtained. The vehicle autonomous parking path programming method is suitable for the multiple parking scenes, the design is reasonable, abundant information can be provided so as to control autonomous parking of the vehicle, and the security coefficient is high.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Unmanned aerial vehicle bridge bottom surface crack detection method and system

The invention provides an unmanned aerial vehicle bridge bottom surface crack detection method and system. The unmanned aerial vehicle bridge bottom surface crack detection system comprises an unmanned aerial vehicle end and a ground workstation. The unmanned aerial vehicle end utilizes an airborne laser radar and an inertial measurement unit to position an unmanned aerial vehicle and form an unmanned aerial vehicle peripheral barrier point cloud to avoid barriers and plan a path; and an airborne platform camera photographs a bridge bottom surface at a constant frequency and stores a high-definition image into a memory. The ground workstation processes the photographed image, and splices an image between bridge piers to form a large-sized bridge bottom surface image; then the edge information in the image is acquired, the morphological corrosive expansion and connection are performed on the edge to extract a complete crack, and the crack is roughly positioned by virtue of a bridge pier position at which the spliced image is arranged; and finally the crack is evaluated, and information about the crack such as a length, a width, a distribution density and the like is analyzed and measured. The unmanned aerial vehicle bridge bottom surface crack detection method and system are high in automation degree, high in efficiency, high in safety coefficient, low in cost and wide in application prospect on the aspect of the bridge bottom surface route inspection.
Owner:WUHAN UNIV

Screen display data protection method

The invention discloses a screen display data protection method and belongs to the field of computer information safety. The method includes that the triggering mechanism and the watermark information of secret-associated data and a screen data protection system are set; a user accesses the secret-associated data and trigger the screen data protection system; the screen data protection system extracts current user information, generates watermark and displays the information; a secret divulging user is searched according to the watermark information on the secret divulging document. The protection system is triggered when the user accesses the secret-associated data and generates the protection watermark with the information of the current user to display the watermark on the screen, the possibility of stealing the secret-associated data and documents through camera shooting, screenshot, picture recording and the like is effectively reduced. Once the data are disclosed, the secret divulging source can be tracked quickly according to the user information recorded by the watermark in the secret divulging document. The watermark is set to be a two-dimensional code or a bar code, the user information can be hidden, the fact that the user who steals the information avoid or remove the watermark on purpose is avoided, and the safety coefficient of the secret-associated data is further improved.
Owner:江苏敏捷科技股份有限公司

Three-connected-arch tunnel double-side cavity construction method for soft geological

InactiveCN101196116AReasonable division of single excavation areaSuitable for manual excavationUnderground chambersTunnel liningEnvironment effectWall rock
The invention relates to the technical field for the engineering of large-section tunnel, in particular to an engineering method for the double lateral tunnel of a three-arc tunnel on soft and weak geological condition, which resolves the problem of longer duration for the exposure of wall rock, easy deformation of tunnel and poor waterproof effect in existing tunnel engineering method. The invention comprises: (1) excavation of lateral tunnel; (2) lining of later tunnel: first of all, dismantle the primary support of the whole section, then pour the arc invert secondary lining and arc section secondary lining with the construction joint being configured at the lower section of the middle wall for the lateral tunnel; (3) after the circular lining a left lateral tunnel I and a right lateral tunnel II on a same section, excavate and line a middle tunnel III. This method realizes simple equipment and convenient engineering; with the construction sequence of building the lateral tunnel and then the middle tunnel, the invention gives full play to the supporting function of the secondary lining of the middle wall, so as to reduce the load borne by the primary support of the arc section of middle tunnel and elevate the safety coefficient; the invention reduces the settlement and impact on peripheral environment, so as to ensure the stability and safety of the excavation working face; small number of construction joint and high working efficiency.
Owner:CHINA RAILWAY 12TH BUREAU GRP

Granular PLA modified material for FDM printing and preparation method thereof

The invention discloses a granular PLA modified material for FDM printing and a preparation method of the granular PLA modified material for the FDM printing, and in particular relates to a novel environmental protection PLA modified material of the FDM printing for large industry and the preparation method of the novel environmental protection PLA modified material for the FDM printing. The granular PLA modified material for the FDM printing comprises the following components in parts by weight: 100 parts of polylactic resin, 10 to 30 parts of inorganic fillers, 5 to 30 parts of polymer elastomers and 1 to 10 parts of other additives. The PLA modified material is manufactured by granulating the components through a mixing extrusion process. The product disclosed by the invention is easy to degrade, environment-friendly and non-toxic, smooth in printing, free of smells and pollution and high in safety coefficients, the printed product has the good characteristics of smooth surface, beautiful appearance, symmetry, stable dimension, difficult shrinkage and the like and is very suitable for use in an FDM 3D printer. Furthermore, waste materials in the production process can be fully recovered and recycled. According to the invention, the polymer elastomers are added, so that the durability of the product printed by using the PLA material is further better than that of the conventional PLA material, and the product further can withstand more pressure and wear.
Owner:NINGXIA KOCEL MOLD

Straddle type monorail operation vehicle with structure comprising two pairs of wheels

The invention relates to an urban rail operation vehicle and in particular relates to a straddle type monorail operation vehicle with a structure comprising two pairs of wheels. The straddle type monorail operation vehicle comprises a carriage, a steering frame, an engine, a transfer case and a walking pump, wherein the steering frame is connected with an underframe of the carriage through a central pin dragging device; the steering frame comprises a framework, a secondary suspension device and a dragging device; the overall framework is of an II-shaped full-steel installed and welded plate type box structure and comprises a side beam, end beams connected to two ends of the upper part of the side beam and two vertical beams which are connected between the end beams; a motor bracket is fixed between the upper part of the side beam and the corresponding vertical beam; two independently-driven walking wheel assemblies are mounted on two motor brackets; four guide wheel assemblies are mounted on two sides of the middle part of the side beam; two stabilizing wheel assemblies are mounted on two sides of the lower part; the secondary suspension device adopts a secondary steel coil spring assembly. The straddle type monorail operation vehicle can reasonably meet the circuit requirements of monorail PC beams and is high in safety coefficient, excellent in dragging performance, simple and compact in structure, easy to maintain, stable in running and excellent in brake performance.
Owner:太原中车时代轨道工程机械有限公司

Transformer substation device maintenance safety monitoring system and method

The invention discloses a transformer substation device maintenance safety monitoring system and method. The system adopts non-contact human body induction and wireless transceiving signal technologies. When a person approaches a device which needs to be monitored, the system carries out automatic verification on the identity of the person and makes a corresponding action and if the identity verification is successful, a camera is started to record videos of a work project, or a database takes corresponding measures of alarm check and the like so as to prevent non-maintenance personnel from approaching a dangerous device and prevent maintenance personnel from personal injuries caused by finding of a wrong target device. The database allocates operation permission electronic certificates to maintenance personnel who already obtain work tickets or operation tickets and the maintenance personnel can only enter specific allowed areas to work when wearing the operation permission electronic certificates and can maintain a device only after fingerprint verification. The transformer substation device maintenance safety monitoring system and method have the advantages of being high in spontaneity, accurate in monitoring, high in safety coefficient, reasonable in design, simple and convenient to operate and high in performance cost ratio so that the security of devices and maintenance personnel is ensured.
Owner:STATE GRID CORP OF CHINA +2

Method and equipment for binding intelligent mobile terminal and intelligent wearable equipment

The invention provides a method and equipment for binding an intelligent mobile terminal and intelligent wearable equipment, and solves the problems that operation is inconvenient, a safety coefficient is low in conventional equipment binding and the like. The method comprises steps as follows: the intelligent wearable equipment has a number and can generate an encryption code, and a two-dimensional code picture is generated according to the encryption code and the number and is displayed on a screen; a related APP (application) is loaded onto the intelligent mobile terminal, the two-dimensional code picture is scanned, and then a scanning result and the number are uploaded to a server; the server judges whether transmission content is valid after receiving the data, and if the answer is positive, the uploaded data are forwarded to the intelligent wearable equipment; the intelligent wearable equipment verifies whether the data are valid after receiving the forwarded data, and if the answer is positive, a module of the intelligent wearable equipment is activated, and an activation and binding success response is sent to the server; the server binds and associates a number of the intelligent wearable equipment with the number of the intelligent mobile terminal after receiving the binding success response, and the binding operation is completed.
Owner:陈王胜

Method for calculating slope stability safety coefficient based on strength reduction of humidifying condition

InactiveCN107330182AOvercome the shortcomings of the unclear mechanical concept of the strength reduction methodLow shear strengthDesign optimisation/simulationSpecial data processing applicationsWeight changeUltimate tensile strength
The invention discloses a method for calculating the slope stability safety coefficient based on strength reduction of a humidifying condition. The method comprises the steps of testing the dry density rhod, the natural moisture content omega1, and the percentage of saturated moisture content omega2 of a slope soil body sample, testing the cohesive force c and internal friction angles of samples with different moisture contents, and calculating the volume weight gamma of the samples, wherein the formula of internal friction angles is shown in the description; drawing the relation curves of the cohesive force c and the internal friction angles respectively with the moisture content omega, and obtaining a mathematic formula of a fitting relation curve; adopting a dichotomy approximation method and considering the volume weight change, and calculating the moisture content omegaF when the slope is in critical failure; calculating the slope stability safety coefficient F. According to the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition, anti-shearing strength of the slope soil body is reduced based on the humidifying condition, the method better conforms to the engineering practice that the moisture content of the soil body is increased, and thus the strength is lowered due to rainfall infiltration or irrigation or the like, and the shortcoming that a prior strength reduction method is not clear in mechanical concept is overcome. When strength reduction is conducted, the adverse influence of the increase of the volume weight of the soil body on the slope stability is further considered. Therefore, the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition is more scientific and safer.
Owner:NORTHWEST A & F UNIV

Slope slipping preventing system of electric car and work method of slope slipping preventing system

The invention discloses a slope slipping preventing system of an electric car and a work method of the slope slipping preventing system.The slope slipping preventing system of the electric car comprises a four-channel anti-lock system, a vehicle control unit, a gear sensor, a motor controller, a motor, an accelerator pedal, a brake pedal, a hand brake switch and a gradient sensor.The accelerator pedal, the brake pedal, the hand brake switch and the gear sensor are all connected with the vehicle control unit through hard wires.The four-channel anti-lock system and the vehicle control unit are connected through a hard wire or CAN wire.The vehicle control unit and the motor controller are connected through a CAN wire.The motor controller and the motor are connected through a hard wire.According to the slope slipping preventing system, the safety coefficient of the whole car can be increased, and the slope slipping danger of the electric car is effectively eliminated.After the electric car gets into the slope slipping preventing mode, An ABS works, the motor and a battery can be effectively protected, the service life of the whole car can be prolonged, energy consumption can be effectively reduced, and driving mileage can be increased.The electric car adapts to the driving habit of a driver and can be safety driven without special operation, and the slope slipping preventing system can be fast put into use in batches.
Owner:NANJING JINLONG NEW ENERGY AUTOMOBILE RES INST

Auxiliary power supply system for motor train unit and fault load reducing method

ActiveCN103935246AGuaranteed operating safety factorLow redundancy requirementElectric devicesElectric powerLow voltageAuxiliary power unit
The invention relates to an auxiliary power supply system for a motor train unit and a power supply method and a load reducing method of the auxiliary power supply system. The auxiliary power supply system for the motor train unit comprises auxiliary current transformers, a bus I, a bus II, bus connectors, a contactor box, medium-voltage loads and a low-voltage power supply system. The bus I and the bus II penetrate through the whole auxiliary motor train unit through the bus connectors on the two sides of carriages. The auxiliary current transformers and the medium-voltage loads are connected with the bus I or the bus II alternately according to the parity number of the motor train unit carriages. Part of the medium-voltage loads of the motor train unit operate in a load reducing mode or are directly disconnected when the auxiliary current transformers break down. The auxiliary power supply system operates in a parallel connection mode through the buses penetrating through the whole auxiliary motor train unit, the relative concentration and flexible arrangement eliminating mode of the motor train unit is achieved, the requirement for the redundancy of each set of auxiliary current exchanging system is low, the economic cost is greatly reduced, the power supply of the whole train unit is stable and reliable, and the passenger comfort level and the running safety coefficient of the motor train unit are guaranteed.
Owner:CRRC QINGDAO SIFANG ROLLING STOCK RES INST

Smart construction site management system based on cloud platform, server and storage medium

PendingCN110222918AGuaranteed safety managementImprove securityResourcesReal-time dataMonitoring system
The invention provides a smart construction site management system based on a cloud platform, a server and a storage medium, and the system comprises a construction site module which collects work information about construction equipment and workers on a construction site; a data storage module which is used for storing the working information in a distributed manner according to the classification of workers, construction equipment and safety; a data analysis module which is used for calling the working information and carrying out real-time data analysis on the working information to generate an analysis result related to the construction equipment and workers associated with the construction equipment; a monitoring system module which is used for acquiring video information corresponding to the workers, construction equipment and safety; the cloud platform, which judges whether working personnel, construction equipment and safety on the construction site generate early warning information or not according to the analysis result and the monitored video information; and an early warning terminal which makes an early warning response according to the early warning information so asto remind the workers and construction equipment on the construction site. Through real-time monitoring, early warning feedback is analyzed in time, and the safety coefficient of construction site management is improved.
Owner:重庆恢恢信息技术有限公司

Automatic stamping production line for electric appliance casings

InactiveCN103071712AReduce labor intensityMeet the stamping / stretching production process requirementsMetal-working feeding devicesPositioning devicesProduction lineNumerical control
The invention relates to an automatic stamping production line for electric appliance casings. As casing parts need to be stamping/stretching-molded by multiple procedures in the existing electric appliance industry, different stamping/stretching presses are needed. Meanwhile, a large quantity of assisting labor is needed for transport, locating and the like among the procedures, so that the existing electric appliance industry also has the defects of large worker labor intensity, low safety coefficient and low efficiency. According to the automatic production line provided by the invention, four numerical-controlled stamping/stretching hydraulic machines are used for the stamping/stretching molding of casing sheets, off-line blanks are conveyed to a centering table one by one to be located after being detached by a set of disassembling and stacking manipulators, the blanks on the centering table are conveyed into a press one by one by a feeding manipulator to be stamped/stretched, the stamped/stretched blanks are taken out by a next feeding manipulator, conveyed to a next centering table to be located, sent to a next press and pressed into products, and the finished products are finally conveyed to an output machine by a discharging manipulator. The provided automatic stamping production line for the electric appliance casings is fully novel, can meet the technical requirements of electric appliance casing production and has the advantages of compact structure, simplicity in operation and convenience in maintenance.
Owner:CHONGQING JIANGDONG MACHINERY

Method for distributing code stream encrypting and decrypting keys in SIP video monitoring system

The invention discloses a method for distributing code stream encrypting and decrypting keys in an SIP video monitoring system. In the method, in a process for calling a 3 pcc between code stream encrypting monitoring front end equipment and code stream decrypting customer premise equipment, or a process of calling a 3 pcc between the code stream encrypting monitoring front end equipment and a media server and a 3 pcc between code stream decrypting customer premise equipment and the media server, seeda, seedb and seedc, which are obtained by the monitoring front end equipment, the media server and the customer premise equipment in an identity authentication process during registration, are used as keys shared with an SIP server and identifiers, the content of an SIP signaling message bodySDP is expanded to carry the encrypting and decrypting keys, and a symmetric algorithm or asymmetric algorithm is used to guarantee the safety of the transmission of the encrypting and decrypting keys. The method has the advantages of generating different keys at each time of broadcasting, greatly improving safety coefficient, resisting replay attack and eliminating the safety hazards of the storage of the keys at multiple places.
Owner:THE FIRST RES INST OF MIN OF PUBLIC SECURITY +1

Single-rail bogie central suspension device provided with aluminum alloy connection sleeper beam

InactiveCN106740956AImprove the state of stressIncreased anti-roll safety factorBogie-underframe connectionsBogieAir spring
The invention discloses a single-rail bogie central suspension device provided with an aluminum alloy connection sleeper beam. The single-rail bogie central suspension device is characterized in that a center pin is connected with a connection sleeper beam; two air spring seat holes in the lower surface of the connection sleeper beam are connected with air springs; a height adjusting device consists of a height valve, a horizontal rod, an upper spherical hinge, a lower spherical hinge, an upper double-end stud, a lower double-end stud and a helical buckle; the upper double-end stud and the lower double-end stud are reverse in rotation directions and construct a bidirectional screw-nut mechanism together with a middle helical buckle; one end of the height valve is fixed to a train body; the other end of the height valve is connected with the horizontal rod; the horizontal rod is connected with the upper end of the screw-nut mechanism through the upper spherical hinge; the lower end of the screw-nut mechanism is connected with a bogie truss through the lower spherical hinge; one end of an anti-rolling steel wire rope is fixed to the connection sleeper beam through a hoisting base; a circular block at the other end is limited through a blocking base on the truss. By adopting the single-rail bogie central suspension device, the connection sleeper beam is provided, so that the stress state of a chassis of an aluminum train body is improved greatly, and convenience is brought to height adjustment of the train body; the single-rail bogie central suspension device has a simple structure and high adjustment accuracy; the anti-rolling safety coefficient of the train body under the working condition of heavy wind is increased greatly through the anti-rolling steel wire rope.
Owner:CRRC CHANGCHUN RAILWAY VEHICLES CO LTD

Intelligent integration equipment in integral kitchen

InactiveCN1600195ARealize integrationRealize networked remote control operationKitchen cabinetsRemote controlEngineering
The invention discloses an intelligent integrated device of an integrated kitchen, comprising kitchen cabints and kitchen electrical equipments, the kitchen cabints and the kitchen electrical equipments are components of the intelligent integrated device of the integrated kitchen, the device is provided with a center controller, respective electrical equipments are interconnected with a center controller circuit, centralization control by the center controller and independent work of the kitchen electrical equipments can be realized simultaneously, each kitchen electrical equipment in the intelligent integrated device of the integrated kitchen comprises a uniform power supply line, a uniform venting and heat sink passage, a uniform plumbling tube and independent smoke evacuation tubes. The kitchen electrical equipment is provided with a temperature detection member for increasing a safety coefficient, safe operation and use condition of the electrical equipments can be operated and monitored on a display screen of the center controller; the center controller also can be accessed to a network to realize network remote control. The invention completely integrates the kitchen cabints and the kitchen electrical equipments, circuits, the vent and heat sink passages are uniform, arrangement is handsome, and operation is safe and convenient.
Owner:惠州市厨易智能科技有限公司

Automatic subpackage and injection device of anchoring agent cartridge

The invention belongs to the technical field of maintenance of mine top plates, and provides an automatic subpackage and injection device of an anchoring agent cartridge to solve the technical problems of bad working environment and high security risk in maintenance of anchor rods by manual cartridge loading. The device comprises a push oil cylinder, a push rod, the anchoring agent cartridge, a cartridge storage box, an injection guide pipe, an injection hose, a positioning sleeve, a nozzle, a spring, a positioning oil cylinder and a drilling rig; one end of the push oil cylinder is connected with the back end of the push rod; the front end of the push rod is inserted in the back end of the injection guide pipe; the cartridge storage box is arranged above the injection guide pipe; an injection port is formed in the side surface of the injection guide pipe; the front end of the injection guide pipe is connected with the back end of the injection hose; the front end of the injection hose is connected with the positioning sleeve; the nozzle and the spring are arranged in the positioning sleeve; a hydraulic oil pipe is arranged at the lower part of the positioning sleeve; and the positioning sleeve is connected with the drilling rig through the positioning oil cylinder. The device is adopted to reduce the work quantity of workers, to improve the working environment and to improve the safety coefficient of the workers.
Owner:TAIYUAN INST OF CHINA COAL TECH & ENG GROUP +1

Distributed optical fiber temperature measurement-based fire early warning method for belt conveyor

The invention relates to the field of coal mine safety, in particular to a distributed optical fiber temperature measurement-based fire early warning method for a belt conveyor. The method comprises the following steps of: dividing a temperature measuring optical fiber into a temperature measuring point, a channel and an area, and processing temperature data measured by the temperature measuring optical fiber by an absolute temperature early warning method, an area relative temperature difference early warning method, an area normal distribution early warning method, a measuring point temperature rise slope early warning method and a measuring point temperature rise variation trend early warning method to acquire a channel threshold early warning characteristic value, an area threshold early warning characteristic value, an area relative temperature early warning characteristic value, an area temperature normal distribution statistical characteristic value, a measuring point threshold early warning characteristic value, a measuring point temperature rise slope early warning characteristic value and a measuring point temperature rise accumulated trend early warning characteristic value; inputting the characteristic values and the measuring point temperature rise accumulated trend early warning characteristic value into a back propagation (BP) neural network model; and outputting a warning coefficient, an early warning coefficient and a safety coefficient by using the BP neural network model.
Owner:CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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