266results about How to "Meet engineering requirements" patented technology

The invention discloses an adjustable bending sheath tube, which comprises a tube body, a traction fiber and a handle. The traction fiber can slide in the tube body and the handle, the tube body has a near end and a far end, the near end is connected with the handle, the handle comprises a branch which is arranged on one side near the near end of the tube body, a movable part which can transversely move along the branch is mounted on the branch, a near end of the traction fiber is fixed on the movable part, a far end of the traction fiber is fixed on the far end of the tube body, an elastic section is positioned near the far end of the tube body, the bending angle of the elastic section is changed when the movable part moves transversely on the branch, and the movable part is threaded with the branch. Compared with bending sheath tubes in prior art, the bending sheath tube is capable of shortening the effective lengthen of the handle and improving the accuracy of the angle controlling, and the operating process is enabled to be convenient and easy to control.

The chemical constituent (weight percentage) of the copper alloy material includes Te 0.1-1.2, Mg 0.2-1.3, Li 0.02-0.50 and Cu as the rest as well as unavoidable impurities. According to specification needed, the contact line of conducting wire is made through the procedures of getting conventional materials ready, mixture making, melting, casting ingot as well as cold working and hot working. Its copper alloy possesses the properties of tensile strength as 523-576 MPa, resistivity as 0.022695-0.023764 ohm mm2/m, recrystallization temperature as 390-410 deg.C. The invented alloy provides the capability of anti electric arc equivalent to the alloy of 0.3Ag-Cu but with lower cost than the 0.3 Ag-Cu alloy about 10-20%.

The invention discloses a nondestructive test and evaluation method of a metal member / material residual life. The method comprises steps of: acquiring a relation curve between a metal member / material residual life and an ultrasonic second harmonic normalized value; carrying out ultrasonic second harmonic signal measurement on a metal member / material to be measured and obtaining a residual life score corresponding to the measured second harmonic normalized value according to the relation curve; predicting a residual life of the metal member / material to be measured according to the residual life score and a loading time of the metal member / material to be measured. The nondestructive test and evaluation method of the metal member / material residual life of the invention can carry out detection and evaluation on creep deformation damage of a working metal member / material part, rapidly and effectively predict the residual life of the working part and provide basis for safe service of the metal member / material.

The invention belongs to the field of sea surface wind direction inversion through a remote sensing means, and particularly relates to a navigation radar image sea surface wind direction inversion method based on a wave number energy spectrum. The method comprises the steps of preprocessing a radar image, extracting sea surface static characteristics and inverting sea surface wind direction information. According to the navigation radar image sea surface wind direction inversion method based on the wave number energy spectrum, a space domain does not need to be reduced, the space domain can automatically adapt to wind stripes of different scales, the wind direction can be measured under different sea conditions, an error result is stable, and engineering availability is high. According to the navigation radar image sea surface wind direction inversion method based on the wave number energy spectrum, only the wind stripe energy spectrum is extracted through wave number energy spectrum wave number scale separation, the wind direction inversion precision is improved, and the interference of the noise of other scales is reduced.

The invention discloses a method for combined measurement of permeability and porosity of a dense rock under dynamic confining pressure. A device for realizing the method comprises a confining pressure control device, a rock core pressure chamber, a downstream air cylinder, an upstream air cylinder, a pressure loading device, an upstream air pressure recorder, a downstream air pressure recorder, an upstream-downstream air pressure difference recorder and a computer. According to the method for the combined measurement of permeability and porosity of the dense rock under dynamic confining pressure provided by the invention, few physical quantities need to be measured, the operation is easy, and dynamic measurement of permeability and porosity under complex stress is realized. In addition, the method has the advantages that the measurement time is short and the accuracy is high for dense rocks with a permeability less than 10 to 17m<2> and a porosity less than 1.5%, and can automatically record the test data; the test result is accurate; the test efficiency is improved; and test data under different pressures are obtained to calculate the permeability and porosity at one time.

The invention discloses a novel phosphorus and magnesium based cement grouting material and a preparation method and belongs to the field of technical application of grouting materials. The grouting material is prepared from the following raw materials in parts by weight: a component A: 30 to 90 parts of a compound magnesium compound, 0.5 to 5 parts of a compound retarder, 0.2 to 0.7 part of a water reducer, 0.2 to 1.5 parts of an acid-alkali buffering agent, 1 to 5 parts of a compound stabilizer and 0.5 to 1.5 parts of a compound surfactant; a component B: 20 to 50 parts of phosphate and 0.2to 2 parts of a de-foaming agent. The preparation method comprises the following steps: accurately weighing materials of the component A and the component B according to the ratio and uniformly stirring; mixing with water according to the weight ratio of 100 to (20 to 50) and stirring to form slurry; after uniformly mixing, pressing a mixture into gaps or cracks and curing. The novel phosphorus and magnesium based cement grouting material disclosed by the invention has the beneficial effects of controllable coagulation time, large adjustable range, high early age strength, high bonding strength, good permeability, simplicity and convenience for construction, greenness and environment protection and low cost, and meets the requirements on three properties including injectability, controllability and permeability resistance.

The invention provides an oil-well cement additive for preventing corrosion of hydrogen sulfide as well as a preparation method and an application thereof, belonging to the field of oil-well cement well cementation. The oil-well cement additive mainly comprises the following components in percent by weight: 20-75% of volcano cinerea mineral, 2-35% of silica powder, 5-30% of aluminum salt mineral,2-35% of pitch organic material, 1-10% of gangue, and the like. By adding 15-60 parts of the oil-well cement additive in the well cementation cement slurry system with 100 parts of cement, the invention can enhance the tightness of a cement loop pillar, has low gas permeability and strong ability for resisting the corrosion of hydrogen sulfide, is suitable for different temperatures in the bad well cementation environment and has wider application range.

The invention discloses a three-dimensional reference line-based BIM creation method for a building. The method comprises the following steps of S1, generating a spatial three-dimensional line based on planar and longitudinal section data of a line; S2, extracting the position of a building plane center, and generating a discontinuous three-dimensional building model according to a relationship between the position and the spatial three-dimensional line; S3, establishing a local coordinate system corresponding to a mileage point of the line, drawing a corresponding structure outline according to the local coordinate system, and performing sweeping and lofting on the structure outline based on the spatial three-dimensional line to generate a continuous three-dimensional building model; and S4, generating a complete BIM of the building. According to the method, the BIM of the building is created; three-dimensional visual design of building layout is realized; the generated model is visual and vivid, and the model is extremely convenient to update and modify, so that the engineering efficiency can be improved; and in addition, the generated model establishes a building full-life-cycle database, so that more bases are provided for later operation and maintenance.

The invention relates to a rapid damage positioning scheme for an internal geomembrane in anti-seepage engineering, belonging to the technical field of hydraulic engineering (civil engineering)- anti-seepage engineering. The method comprises the following steps of: combining continuous optical fibers and the geomembrane into a whole, wherein the optical fibers are uniformly arranged in a snakelike shape on the geomembrane, and the distance between the optical fibers is not greater than the temperature-sensitive distance of double optical fibers; using the geomembrane as an anti-seepage material and making the optical fiber path of the whole anti-seepage area through; leading out the endpoints of the optical fibers to an optical fiber temperature-measurement detection device and covering aprotective layer of the geomembrane; and establishing a conversion formula between the XY coordinate values of optical fiber length L and an anti-seepage face according to the arrangement design of the anti-seepage engineering, monitoring the temperature of each position of the geomembrane by adopting the optical fiber temperature-measurement detection device, judging the area with abnormal temperature comparison to be a seeping position and judging the position with highest temperature abnormality to be the central position of the geomembrane damage. The method solves the problem of difficult damage positioning of the geomembrane and can obviously improve the safety of a dam using the geomembrane as an anti-seepage body.

The invention relates to the technical field of retaining walls of soil filling slopes, and discloses a semi-assembly type retaining wall of a soil filling slope. The semi-assembly type retaining wall of the soil filling slope comprises a plurality of reinforced concrete piles, pile top tie beams and upright columns, wherein the pile top tie beams are arranged at the upper ends of the reinforced concrete piles; intercolumnar tie beams are arranged in the middles of the upright columns; an intercolumnar gap is formed between each two adjacent upright columns; a balancing beam is arranged on the back side of each upright column; an inter-beam gap is formed between each two adjacent balancing beams; a retaining vertical plate is inserted in each intercolumnar gap; and a balancing flat plate is paved in each inter-beam gap. The retaining wall is provided with the reinforced concrete piles, and is well-adapted to geological conditions; balancing beam and slab structures are arranged on the back sides of the upright columns, so that the stress of the whole retaining wall is reasonable, the construction cost for the retaining wall is saved, and the applicable height of the retaining wall is increased; and moreover, the retaining wall has a semi-assembly structure, the curing period of pouring baffles is avoided, the construction speed is increased, and anchor cables are not required in the retaining wall, so that potential safety hazards caused by the reason that the anchor cables are easy to corrode and poor in durability are avoided.

The invention provides a trajectory prediction system and method, electronic equipment and a readable storage medium, and the method comprises the steps: obtaining the historical position of an automatic vehicle in a world coordinate system, the historical relative position of a to-be-predicted object relative to the automatic vehicle, and the environment information of the to-be-predicted object, based on the historical position of the automatic vehicle in the world coordinate system, the historical relative position of the to-be-predicted object relative to the automatic vehicle and the environment information of the to-be-predicted object, obtaining the historical positions of the to-be-predicted object and surrounding obstacles in the world coordinate system; according to the historical positions of the to-be-predicted object and the surrounding obstacles in the world coordinate system, obtaining and semantically extracting the relative historical trajectory of the to-be-predicted object based on the historical relative positions of the to-be-predicted object relative to the surrounding obstacles, and combining the relative historical trajectory with the lane information subjected to semantic extraction to obtain a semantic historical trajectory; and inputting the semantic historical trajectory into the trajectory prediction model to perform trajectory prediction of the to-be-predicted object. According to the method, the unmanned driving computing power is greatly improved, the computing consumption in the unmanned driving operation is minimized, the prediction precision can be ensured, and the engineering requirements are better met.

The invention relates to a method for simulating noise radiation and decomposing noise sources when an automobile speeds up, which is characterized in that: individual noise characteristics are measured by performing a bench test on a structure and an engine, the engine and a gearbox, a cooling fan, a muffler, an exhaust port, an inlet port, tires and a rear axle of a vehicle. The method comprises the following specific steps: (1) establishing an acoustical model of an assembly individual; (2) establishing a motion equation of the vehicle in an accelerating outside noise test based on an incoming speed, an outgoing speed and a length of the vehicle regulated by an accelerating outside noise measurement method; (3) when the vehicle is at an x position, measuring predicted sound pressure at a microphone by using a formula; and (4) predicting a sound pressure level of maximum accelerating outside noise. The accelerating outside noise is simulated, predicted, and compared with an outfield measurement and an anechoic chamber through a noise simulation test; and a deviation between a simulation calculation and a measured result is within 2dB (A) so as to meets project requirements.

The invention discloses an oil well cement additive used for preventing H2S/CO2 co-corrosion, and a preparation method and an application thereof. The oil well cement additive comprises 100 parts of fly ash, 20-40 parts of slag, 6-10 parts of sodium methylsiliconate, 10-30 parts of organic material asphalt, 10-30 parts of micro silica powder, and 10-40 parts of ultrafine alumina. Calculated according to the weight of cement as 100 parts, 30-65 parts of the oil well cement additive used for preventing H2S/CO2 co-corrosion is added. With the additive, cement stone compactness is improved. Cement stone gas permeability is low, and hydrogen sulfide and carbon dioxide co-corrosion resistance is high. The additive can be applied in different temperatures, and an application range is wide.

The invention discloses a novel flexible coast protection structure and a construction method of the novel flexible coast protection structure. The structure comprises a mattress tying beam and a wave dissipating platform, wherein the mattress tying beam and the wave dissipating platform are close to the designed water level; the wave dissipating platform is connected with the bottom and the top of a bank slope through a slope and a wave wall respectively; a pebble cushion layer and composite geotextiles are sequentially laid on the lower surface of the slope and the lower surface of the wave dissipating platform. Composite geotextiles and a gravel cushion layer are sequentially laid on the upper surface of the slope and the upper surface of the bottom of the bank slope. A concrete hinged mattress is laid on the gravel cushion layer. The top end of the hinged mattress is connected to the mattress tying beam. The method comprises the steps of prefabrication of concrete ballast block bodies, construction of the mattress tying beam and a bank protection structure above the mattress tying beam, splicing of the concrete hinged mattress, mattress sinking construction and the like. Compared with the existing coast protection technology, the novel flexible coast protection structure has the advantages that the integrity is good, the anti-erosion capability and the coastal erosion deformation adaptability are high, materials are easy to obtain, construction is easy, and maintenance management is convenient; the problem that a traditional rigid seawall bank protector is prone to collapse and damage on the condition of coastal washout deformation can be effectively solved, and a new approach is provided for coast protection.

The invention relates to a spraying method of a secondary solution for improving expansive soil. The spraying method is characterized by comprising the following steps of: (1) dissolving water glass with the mass m1 into water with the mass mw1 to prepare water glass solution, uniformly spraying the water glass solution into dry expansive soil with mass ms, mixing uniformly, standing for 2-12h for later use; and (2) dissolving aluminum sulfate powder with mass m2 into water with mass mw2 to prepare an aluminum sulfate solution, uniformly spraying the aluminum sulfate solution in a standby soil sample obtained in the step (1), mixing uniformly, standing for over 2h, and carrying out compaction treatment when the moisture content is reduced to the optimal moisture content. Compared with the traditional method for improving lime or cement and the like, the spraying method is simple in process and remarkable in effect and meets the requirement for environment friendliness.

The invention discloses an ultra-wide-band horizontally-polarized omnidirectional connection type Vivaldi circular array antenna, and mainly solves the problems of wide frequency band, omnidirectional horizontal polarization and miniaturization of an antenna cannot be satisfied in the prior art. The ultra-wide-band horizontally-polarized omnidirectional connection type Vivaldi circular array antenna comprises a radiation unit (1), a feeding network (2) and a dielectric plate (3), wherein the radiation unit (1) is a 16-element connecting type Vivaldi antenna array which is formed by a Vivaldi unit around a center in a rotating manner; the feeding network (2) adopts a one-into-sixteen broadband Wilkinson power divider and a coupling microstrip feeder line; electromagnetic energy is coupled to the radiation unit through the coupling microstrip feeder line; the dielectric plate (3) adopts a Kangtaini (a Chinese brand name)dielectric plate with a dielectric constant of 2.55; the radiation unit and the feeding network are printed on the upper and lower surfaces of the dielectric plate; and the centers of the radiation unit and the feeding network coincide with that of the dielectric plate. The circular array antenna has the characteristics of ultra wide band, omnidirectional horizontal polarization and miniaturization, and can be used in a full-coverage ultra-wide-band wireless communication system in the peripheral regions.

The invention provides a symmetric turnout for line rails No.4 and No.5 in urban rail traffic engineering. The turnout is arranged on a parking line rail of an underground line in an urban rail engineering, the structure of the symmetric turnout comprises a group of railroad switches, a group of frogs and a connecting steel rail, wherein the railroad switches are connected with the frogs by virtue of the connecting steel rail so as to form a symmetric turnout provided with two side rails. The symmetric turnout provided by the invention has the beneficial effects that the turnout ensures a subway and a light rail vehicle to travel safely between a main line and a parking line, related technical standards and safety requirements of the urban rail engineering are met, and the advantages of safety, reliability and convenience in manufacturing, paving, construction and maintenance are realized. By applying the symmetric turnout provided by the invention, turnout investment can be saved, and length of an auxiliary line can be obviously shortened, thus investment of a building project is greatly saved, construction difficulty is reduced, and project risk is reduced.

The invention discloses a method for constructing a collaborative awareness system on the basis of development objects of complex products. The method particularly includes steps of firstly, selectively using a B/S network structure, namely a Browser/Server network structure, as a system architecture; secondly, analyzing elements relevant to a complex product development procedure and relations of the elements and creating a database table; thirdly, searching collaborative awareness information of current users; fourthly, visually displaying awareness results; fifthly, creating an operational mechanism of the system. Displayed contents of the awareness results include a current operation model, a current task, a current task flow diagram, an object diagram, a total task list, other tasks and relevant personnel. The method has the advantages that the information concerned by the users is displayed in proper modes, so that convenient and simple user interfaces are provided for the users, the users can concentrate on completing the tasks, the collaborative work efficiency can be improved, and the method has a wide application prospect in the fields of computer-supported collaborative work and complex product development.

An ultrasonic guided wave detector for detecting length of anchor bolt is prepared as connecting arbitrary function generator to change - over switch through power amplification module, connecting change - over switch to guide wave transmitting - receiving element and gain amplification module, connecting gain amplification module to waveform analysis and display module.