60results about How to "Meet the requirements of engineering applications" patented technology

The invention discloses a fusion-deposition 3D printer. The fusion-deposition 3D printer comprises a shell, a lifting mechanism and a composite extruding mechanism, wherein the lifting mechanism is mounted in the shell; the composite extruding mechanism comprises a machine cylinder, a screw rod and a long-fiber conveying pipe, a feeding pipe communicated with a material cavity of the machine cylinder is arranged on the side wall of the machine cylinder, the screw rod is rotatably mounted in the material cylinder and is provided with a mounting channel, and the upper and lower ends of the screw rod are communicated through the mounting channel; the long-fiber conveying pipe is inserted into the mounting channel and is provided with a conveying channel for conveying long continuous fibers; the conveying channel, the mounting channel and the material cavity are sequentially communicated. The invention further discloses a printing method of the fusion-deposition 3D printer. According to the fusion-deposition 3D printer and the printing method thereof, the long continuous fibers and printing materials packing the long continuous fibers are synchronously extruded to a working platform, so that the strength and surface flatness of a printed product are improved, and the machining efficiency is improved.

An enhancement type analog predistortion linear power amplifier, including a signal splitter unit, a first main power amplifier, a predistortion generation unit, a delaying filter, a error power amplifier, a 3dB electric bridge, a control cell and a receiver, the input end of the signal splitter unit is a radio frequency input terminal port, the input end of the first main power amplifier and the first input end of the predistortion generation unit are respectively connected to the output end of the signal splitter unit, the first output end of the first main power amplifier is connected to the input end of the delaying filter, the second output end is connected to the second input end of the predistortion generation unit, the output end of the predistortion generation unit is connected to the input end of the error power amplifier, the control cell controls every device, the output ends of the delaying filter and the error power amplifier are connected to the input end of the 3dB electric bridge, and the output end of the 3dB electric bridge is a radio frequency output terminal port. The enhancement type analog predistortion linear power amplifier provided by the invention has the advantages of improved ACPR, self-adapting function, considerably improved integral efficiency of power amplifier, thereby totally meeting the applied request of engineering.

The invention relates to the communication technology field and especially relates to a method and a system for realizing dual-mode network energy-efficiency joint simulation. The method comprises that simulation parameters are set and comprise at least a first predetermined amount of simulation time slices; aiming at every simulation time slice, energy-efficiency simulation of a first system network is carried out, mobile station states accessing the first system network are saved, the energy-efficiency simulation of a second system network is carried out and the mobile station states accessing the second system network are saved; based on the mobile station states accessing the first system network and the mobile station states accessing the second system network, a network energy-efficiency simulation result of every simulation time slice is obtained. The method provided by the invention is suitable for energy-efficiency simulation and evaluation of a dual-mode mobile network, has good simulation precision and high simulation efficiency, can satisfy requirements of engineered application and evaluate network energy-efficiency of different scenes, different business demands and different site selection and layout plans.

The invention discloses an identification and judgment method for switching into fault protection. A Prony analysis method is used for current waveform fitting and acquiring frequency, amplitude, attenuation factor and phase characteristic values of current components, criteria of switching into line fault protection are proposed by the aid of frequency, amplitude, attenuation factor and phase characteristic value parameters, and frequency domain characteristics of signals are identified. By the aid of a large number of simulation experiments, current waveforms of line no-load switching-in, single-phase fault and three-phase fault lines with fault distances of 10km, 50km, 90km, 100km, 200km, 300km and 400km are simulated respectively and fitted by the Prony analysis method, and frequencies, amplitudes, attenuation factors and phases of the current components are extracted. The criteria of switching into line fault protection are proposed by the parameters, and simulation results prove accuracy and reliability of the criteria.

The invention discloses a diagnosis and compensation method for a rigid spacecraft multi-reaction flywheel fault. According to method, attitude dynamics and kinematics mathematical models for the rigid spacecraft multi-reaction flywheel fault are established; a fault diagnosis unit is designed to detect and estimate an unknown fault; and a non-singular fast terminal sliding mode technology is adopted to design an active fault-tolerant control scheme on the basis of fault estimation information obtained from the fault diagnosis unit. With the diagnosis and compensation method of the invention adopted, the fault of a rigid spacecraft can be diagnosed and compensated when the rigid spacecraft has a multi-reaction flywheel fault, or the reaction flywheels of the rigid spacecraft are saturated;inertia uncertainty and the adverse effects of external disturbances on the system in a design process can be processed at the same time; and the fault diagnosis unit and the fault-tolerant controller are designed independently, and therefore, design complexity can be reduced, and the requirements of engineering applications can be better satisfied.

The invention discloses a novel core-shell structured biological filler and a preparation method of the novel core-shell structured biological filler. The filler is prepared from the following raw materials in terms of mass percent: 20 percent to 30 percent of activated sludge, 0.2 percent to 1 percent of antibacterial deodorizing agent, 15 percent to 25 percent of bamboo charcoal powder, 2 percent to 5 percent of iron oxide red, 8 percent to 15 percent of calcium oxide and 35 percent to 50 percent of silicate inorganic gel. The method comprises the following steps of mixing the activated sludge, the antibacterial deodorizing agent and 15 percent to 35 percent of the silicate inorganic gel in total quantity, and squeezing, granulating and drying the mixed materials to obtain aggregates; uniformly mixing the bamboo charcoal powder, the iron oxide red, the calcium oxide and the residual silicate inorganic gel to obtain a powder material; putting the aggregates onto a ball forming disk, and spraying the powder material and water at the same time along with the process of rotating the ball forming disk, wherein the water spraying quantity is 5 percent to 20 percent of the total mass of the raw materials; gradually wrapping the surface of the aggregates by utilization of the powder material so as to obtain a preliminarily-cured core-shell filler, and obtaining the novel core-shell structured biological filler after curing. The filler disclosed by the invention has the advantages of short biological startup period, strong acid/base buffering capacity and rapid biochemical reaction rate.

The invention discloses a digital data acquisition device. The device comprises the following functional plugins: a power panel, an AC sampling panel, an FT3 panel, a CPU panel, a bus back panel, and a liquid crystal display panel, wherein the AC sampling panel is connected to an analogue voltage and current signal output by a traditional electromagnetic mutual inductor; the FT3 panel is connected to the digital signals acquired by an electronic voltage transformer and an electronic current mutual inductor; the CPU panel is used for processing sampled data, transmitting a sampled message and receiving an external IEEE1588 time tick message and a GMRP message, and transmitting equipment state alarm information through GOOSE at the same time; the bus back panel is connected to the plugins of the device and realizes bus communication between the panels; and the liquid crystal display panel is used for displaying the sampled data of the device, recording failure events and setting parameters. The device can realize whole-station sharing of the sampled data, can control the sampling synchronous error of the data to be lower than 1 microsecond at the same time, greatly improves the data sampling precision and improves the reliability and accuracy of protection over the whole station.

The invention discloses an outgoing light power monitoring method for an ONU (Optical Network Unit) optical module. The method comprises the following steps of: judging an outgoing light power monitoring value through the light emitting state of a laser module; assigning the initial monitoring value in MCU (Microprogrammed Control Unit) as 0; and then obtaining a sampling value transmitted from a monitoring circuit; refreshing and storing a new monitoring value if the laser module emits light; and still keeping the previous monitoring value if the laser module does not emit light. Therefore, problems that false report of light power is caused by environment light and the traditional sampling keeping circuit cannot keep light power sampling value for a long time can be solved; and the requirements of engineering application are satisfied with high efficiency at low cost.

The invention discloses an aluminium base amorphous composite powder, comprising the following four elements in atomic percent: 86-89.8% of aluminium, 5-7% of nickel, 5-7% of yttrium and 0.2-0.5% of carbon. The invention also discloses a mechanical alloying preparation method of the amorphous powder and an aluminium base bulk amorphous alloy obtained by adopting a powder consolidation forming method while the amorphous powder is utilized. A carbon element material with high thermal stability is doped, and reasonable composition proportion is adopted, thus thermal stability of the amorphous alloy is unprecedentedly improved, glass transition temperature and initial crystallization temperature are respectively adjusted and increased to 945K and 1063K, and an enhancement effect is obvious. The preparation method has a simple process and low cost, the prepared bulk amorphous alloy can guarantee performances of bulky amorphous alloys, and reliable technological parameters are provided for industrial production of the aluminium base amorphous alloy in future.

The invention discloses a process for preparing high-compactness tungsten-copper alloy metal materials by utilizing tungsten powder. The process comprises the following steps: (1), dispersing the tungsten powder in copper-plating liquid, and pre-plating copper by adopting an electroless plating method; transferring the tungsten powder subjected to pre-plating of copper into CuSO4 acidic electroplating liquid and performing electro-plating of copper; and performing post-treatment after electro-plating so as to obtain tungsten-in-copper composite powder; (2), pouring the tungsten-in-copper composite powder prepared in the step (1) into a graphite mould, then putting the graphite mould in a discharge plasma sintering furnace, and then performing vacuumizing and pressurizing to obtain a sintered body; and (3), performing hot isostatic pressing resintering on the sintered body in the step (2), and finally obtaining the high-compactness tungsten-copper alloy with the compactness degree beingmore than 99.5 percent. The process disclosed by the invention has the disadvantages of difficult sintering of the tungsten-copper alloys and low compactness degree.

The invention provides a digitalized designing and manufacturing method for an inserting pipe. The method includes firstly conduction determination of manufacturing and mounting data of the inserting pipe with a digitalized measuring instrument; converting the measured data into data needed for the computer aided design of the pipe manufacture; and then conducting computer aided design and manufacture of the inserting pipe. The proposal of the invention realizes the effective connection of digitalized measurement and digitalized design and manufacture, and considerably improves the manufacture precision and the yield rate, thereby shortening the manufacture period, lowering the manufacture cost and overcoming the defects of the prior low-performance inserting-pipe manufacture mode which contains artificial sampling, experience-based pipe producing and filed fitting.

The invention relates to a method for calculating the composite stiffness of a main and auxiliary spring type composite material plate spring. The calculation method comprises the following steps: firstly, calculating the bending stiffness of each cross section of a composite main spring and an auxiliary spring according to the mechanics of the composite, and deducing a calculation formula for thebending stiffness of each cross section of the composite main spring and the auxiliary spring through a formula; and then, based on the finite difference theory, a step of calculating the composite stiffness of the main and auxiliary springs of the composite material after the main and auxiliary springs work together is given, and deriving a calculation formula of the composite stiffness of the main and auxiliary spring type composite material plate spring. The calculation method provided by the invention not only provides a theoretical basis for the calculation of the composite stiffness ofthe main and auxiliary spring type composite material plate springs, but also is high in calculation precision and applicable to the calculation of the composite stiffness of the main and auxiliary spring type composite material plate springs with any section shapes. Besides, the calculation method is also suitable for programming calculation, the calculation speed is far higher than that of traditional calculation methods such as finite element analysis, the research and development period of the composite material plate spring can be remarkably shortened, and the research and development cost is reduced.

The invention discloses an infrared target detection method and device based on multi-feature fusion, equipment and a medium. The method comprises the following steps: acquiring a detection target image; performing global threshold segmentation on the detection target image to obtain a binary image; performing connected domain marking on the binary image to obtain candidate targets; performing feature extraction on each candidate target, and performing filtering processing on each feature channel to obtain a feature component value of each candidate target; performing multi-feature fusion on the candidate targets to obtain a normalized feature vector; and judging whether the normalized feature vector reaches a detection threshold, if the normalized feature vector reaches the detection threshold, reserving the candidate targets, and otherwise, deleting the candidate targets. Aiming at the problems of low infrared image contrast, less target feature information and the like, multi-feature fusion processing is performed by mining multiple feature information of targets and clutters, and parallel processing is performed by using multiple feature channels, so that the target detection probability is improved, and the false alarm rate is reduced.

The invention belongs to the technical field of shield construction engineering and relates to a shield construction soil discharge quantity real-time on-line measuring device based on a pin wheel device. The shield construction soil discharge quantity real-time on-line measuring device comprises the pin wheel device, wherein the pin wheel device is arranged at the soil outlet part of a spiral conveyer of a shield machine and is arranged in a plane vertical to the residue soil direction. The pin wheel device comprises a pin wheel, a pin wheel shaft, a left box body, a right box body and a shaft coupler, and the pin wheel shaft is connected with a rotary encoder through the shaft coupler. A control part is used for carrying out storage, preprocessing, integrating and display operation on original data, the cross section value of the soil outlet is integrated with the output speed of the rotary encoder by software, and the soil discharge quantity volume is obtained. The measuring device is applicable to conditions that the shield machine passes through humid soil layers with a certain viscosity, and the outlet soil of the spiral conveyor can form humid column bodies with a certain viscosity, the accurate and real-time measurement of the soil discharge volume is realized, the precision and the real-time performance of the original measuring method is improved, and the shield construction requirements are met.

The invention provides a PC (polycarbonate) composite with high wear resistance and high strength and a preparation method of the PC composite. The composite comprises main raw materials as follows: bisphenol A PC, fluorine-containing polymer micronized wax, glass fiber, a solubilizer and a flow modifier. Firstly, the raw materials except the glass fiber are added to a mixer for sufficient mixing,then the mixed material and the glass fiber are added to an extrusion machine for blending extrusion and granulation, and finally, granules are added to an injection molding machine for injection molding. The adopted fluorine-containing micronized wax has smaller grain size, is an organic high-molecular compound, is easily dispersed in a PC matrix and keeps better compatibility and interfacial adhesion property with matrix resin. Meanwhile, with addition of the solubilizer, compatibility between the PC and the glass fiber and compatibility between the fluorine-containing micronized wax and the glass fiber can be remarkably improved, so that the prepared composite has good wear resistance and mechanical performance, and can be widely used for manufacturing products meeting requirements forhigh wear resistance, high strength and better toughness.

The invention relates to a regulation and control system and a method for effect of atmospheric temperature on power of combined cycle unit, and belongs to the technical field of electric power and energy saving. The method includes the steps that first sample data is collected through a sensing measurement module, original data and generated power data at test points on the combined cycle power generating unit are obtained under conditions of different atmospheric temperatures and a standard generated power, original data and generated power data at test points corresponding to the same atmospheric temperature are stored in a database module as a sample group; then several sample groups are selected from the database module by a simulation calculation module to build a original sample data set, and a maximum value and a minimum value of the original data at test points in the original sample data set are determined, and a maximum value and a minimum value of the generated power data at test points in the original sample data set are also determined; finally, a correction curve of effect of atmospheric temperature on the generated power of the combined cycle power generating unit is calculated by BP neural network. The regulation and control system and the method for effect of atmospheric temperature on the power of combined cycle unit have the advantages that the generated power of the combined cycle power generating unit is corrected without the need for various test debugging, a practical and reliable basis is provided for optimization of the unit and energy saving and emission reduction evaluation.