45results about How to "Expand the scope of engineering applications" patented technology

The invention discloses an integrated pin tool used for friction stir welding and a composite method of resistance-friction stir welding thereof. The pin tool comprises a pin tool body arranged on a friction welder and a tool pin arranged at the lower part of the tool pin body which is connected with the welder in a clamping and insulating manner; the pin tool also comprises a forced cooling system, a current carrying system, a gas shielding system, a temperature sensing and detecting system, a sealing and insulation system, an inner shaft shoulder and the tool pin, and is an integrated pin tool which has the functions of gas shielding, forced circulation cooling of internal liquid medium, automatic temperature sensing and detection, tool pin changing and composite non-keyhole resistance-friction stir welding. The invention overcomes the difficulty of friction stir welding of the high melting point metal and meets the harsh technical requirements of the friction stir welding of the low melting point metal, improves the quality of welding joints, prolongs the service life of the pin tool and realizes the friction stir welding of high melting point metal and low melting point light alloy, with low cost, high efficiency and excellent quality.

The invention provides an energy-saving resonance type electric actuator. The energy-saving resonance type electric actuator comprises a casing, an excitation coil group, a leaf spring and a runner, wherein the casing is formed by connecting an upper end cover and a base, the excitation coil group comprises a bracket and coils wound on the bracket, the bracket is fixedly connected with an upper end cover, the runner is formed by connecting an internal yoke iron, an external yoke iron and a permanent magnet in series, the internal yoke iron, the external yoke iron and the permanent magnet are fixed on a guide shaft, the bracket is positioned in an air gap formed by the internal yoke iron and the external yoke iron, the internal yoke iron forms a sealed magnetic path with the permanent magnet and the external yoke iron, the guide shaft is installed between the upper end cover and the base by a bearing, and the external yoke iron is connected with the base by the leaf spring. The invention can output larger actuation force under the condition of low energy consumption and has compact structure and extensive engineering application prospect.

The invention relates to a method for preparing a nano material with large thickness and area through acute plastic deformation. The method comprises the following steps: adopting carrying current acute stirring friction forced highly undercooled control technology under the action of electromagnetic vibration in-situ compound electromagnetic field to prepare a metallic nano grain material and a ultrafine grain material with large thickness and area; adopting an electromagnetic vibration coil to ensure that a stirring head carries out high-speed stirring and electromagnetic vibration stirring friction composite motion combined with electromagnetic vibration at a certain frequency; and forming an alternating electromagnetic field of a certain intensity inside a workpiece. Under the joint action of carrying current stirring friction and a forced highly undercooled control temperature mechanism, coarse grain structure of the metal surface in a certain thickness undergoes acute plastic deformation and breaks to form stable nano grain and ultrafine grain structure; thus, the method realizes the preparation or surface modification of the metallic nano material with large thickness and area and uniform structure, and can also be used in stirring friction welding.

The invention belongs to the technical field of structure vibration control and discloses an ultralow frequency swinging type tuning mass damper and an achieving method thereof. The novel tuning mass damper is formed through an added negative stiffness adjusting device with a novel structure, meanwhile, the achieving method of the tuning mass damper is disclosed, accordingly the swinging length of the ultralow frequency swinging type tuning mass damper (TMD) can be effectively shortened, the mounting space of the TMD is decreased, and the engineering application range of the ultralow frequency swinging type TMD is expanded.

The invention relates to a mountainous region photovoltaic power station addressing method based on DEM data, and belongs to the technical fields of geographic information system and photovoltaic engineering. The steps of the method are listed as follows: an addressing region slope degree and slope direction digital landform model is established based on the DEM; if the slope degree of a certain point lies in the latitude range of +/-5 degrees of the location, and the slope direction lies in the range of +/-2 degrees of the right south direction, the photovoltaic power station is suitable to establish, and thus the certain point is marked; adjacent marked points are communicated, and addressing classification is performed and installation capacity of the photovoltaic power station in a certain mountainous region is calculated according to the size of area; and a KML script file is outputted, and Google Earth is applied to browse addressing results. According to the method, preliminary addressing of the photovoltaic power station can be rapidly completed and a basis for photovoltaic power station engineering design and labor field investigation is provided so that cost of photovoltaic power station is lowered and establishing speed is enhanced. Besides, analysis and evaluation can be performed on establishing potential of the photovoltaic power station on global geographic positions, and thus more detailed assessment can be performed on solar energy resources.

The invention relates to the technical field of power distribution and protection and in particular relates to a DC zonal power distribution system and a power distribution protection method developed based on the power distribution system. The power distribution system comprises a medium-voltage DC bus, a low-voltage DC bus, a DC low-voltage load, an AC low-voltage load, an AC medium-voltage load and a plurality of AC generators; the AC generated by each AC generator is converted into DC by a rectifier for supplying to the medium-voltage DC bus; the medium-voltage DC bus is capable of inverting medium-voltage DC into medium-voltage AC by use of a primary inverter and then supplying the medium-voltage AC to the AC medium-voltage load, and the medium-voltage DC bus is also capable of stepping down the medium-voltage DC into low-voltage DC by use of a primary chopper and supplying the low-voltage DC to the low-voltage DC bus; the low-voltage DC bus is capable of stepping down the low-voltage DC into the voltage needed by the DC low-voltage load by use of a secondary chopper and inverting the low-voltage DC into the voltage needed by the AC low-voltage load by use of a secondary inverter. The power distribution system realizes the conversion, transmission and distribution of electric energy; besides, the engineering application range of the DC power system is expanded.

The invention discloses a superlattice multilayer film and a preparation method thereof. The superlattice multilayer film comprises nanocrystal phase layers, an amorphous transition layer and amorphous phase layers, wherein the nanocrystal phase layers and the amorphous phase layers are alternately deposited on the amorphous transition layer. The preparation method comprises the following steps: arranging a magnetron sputtering source at one side of a vacuum chamber, and arranging an electric arc source at the other side; placing a polished and cleaned workpiece into the vacuum chamber, and setting process parameters; introducing Ar gas into the vacuum chamber, biasing to carry out Ar ion bombardment cleaning on the surface of the workpiece, and decreasing the bias; starting the electric arc source and the magnetron sputtering source, and depositing for certain time to generate a Ti/WC amorphous transition layer; and inflating N2 gas into the vacuum chamber for a certain time, and depositing to generate a TiN nanocrystal phase layer and WC amorphous phase layers. The obtained product is compact and uniform, and the bonding strength is improved. The invention realizes the superhardness effect and the high tenacity of the Ti/N-based film, and the amorphous WC layers in the superlattice multilayer structure also greatly improve the corrosion resistance and the oxidation resistance of the superlattice multilayer structure.

The invention relates to a design process of a shield for resisting electro-magnetic interference in a liquid capacitance type sensor, which comprises firstly determining the frequency spectrum of an interference source needing to be shielded, secondly determining the sensitivity characteristic of the sensor, conducting the sensitivity test for a device which is actually interfered to obtain the sensitivity characteristic curve line, thirdly calculating the round hole size of the shield according to the relative theories of cut-off waveguide, the actual shielding requirements and the working environment request of the sensor, fourthly building a simulation model in a computer, and conducting value emulation calculation, comparing the shielding results, and finally instructing to process real objects according to the calculated results. The invention solves the problem of the electro-magnetic interference of the sensor, and facilitates the sensor to work normally under the electro-magnetic radiation, and the shield which is designed has light weight and excellent oil permeability, and can not affect the normal working.

The invention relates to a distributed fault diagnosis method based on a centrosymmetric polyhedron, and provides a distributed fault diagnosis method for distributed measurement systems such as grid-connected power generation. Herein, the centrosymmetric polyhedron is adopted to describe disturbance and noise ranges, a distributed fault diagnosis observer is constructed, the range of residual errors is further analyzed, and the fault diagnosis accuracy is improved. Then dynamic threshold value for fault diagnosis is generated, so that the limitation that the threshold value cannot be effectively obtained through an existing distributed fault diagnosis method is broken through, and the accuracy of fault diagnosis is improved. Moreover, aiming at the problem that the distributed fault diagnosis centrosymmetric polyhedron of a distributed measurement system for grid-connected power generation and the like is large in local calculation workload over time, a simplified dimension reductionmethod of the centrosymmetric polyhedron is adopted, so that the calculation amount of a distributed fault diagnosis threshold value is reduced, real-time fault diagnosis in industry is facilitated, and the practical engineering application range is expanded.

The invention provides a test method applying compressing load and stretching load in the vertical direction and the horizontal direction simultaneously, belongs to the technical field of polymer-based shape memory material training methods and solves the problems of poor shape memory effect and limited application range caused by the unidirectional training method at present. The test method comprises the steps that firstly, a polymer-based shape memory material is prepared and processed into a cross test piece, and the cross test piece is mounted and fixed in a clamp; compressing load is applied under the condition that the temperature is higher than the glass-transition temperature of the test piece, compressing stress and stretching stress are produced simultaneously in the vertical direction and the horizontal direction of the test piece simultaneously, heating is stopped when the test piece is deformed to a designed value, the compressing load is kept unchanged, the test piece is cooled naturally to the room temperature and the load is removed, and a sample with a shape memory function is prepared; the shape memory effect, molecular orientation, internal stress and structure change of the sample are inspected finally, and the shape memory of the sample is studied. With adoption of the convenient training method, the two-dimensional training difficulty of the polymer-based shape memory material is reduced, the shape memory effect is improved, and the engineering application range is enlarged.

The invention discloses a flexible joint and a double-drive gantry rectangular coordinate platform. The flexible joint comprises a first connecting block, a second connecting block, a connecting structure and an offset connecting tool. One end of the first connecting block is connected with one end of the second connecting block through a connecting structure; the whole connecting structure is ina wheel type crossed shape, the other end of the first connecting block is fixedly connected with a first object, the other end of the second connecting block is connected with the offset connecting tool, the offset connecting tool is fixedly connected with a second object, and the connecting position of the second connecting block and the offset connecting tool deviates from the center line of the second object. According to the invention, the joint stress can be effectively buffered, and the accurate detection of the cross beam corner can be realized through the analytical model.

The invention discloses a remote engineering and geological disaster safety monitoring system based on an unmanned aerial vehicle and a method thereof. The system comprises data acquisition units, a wireless communication management unit, an unmanned aerial vehicle and a wireless data acquisition unit, wherein the data acquisition unit acquires monitoring data; the wireless communication management unit reads monitoring data from each data acquisition unit and stores the monitoring data; when the unmanned aerial vehicle flies to an engineering destination with the wireless data acquisition unit, the power supply of the wireless data acquisition unit is turned on, and a communication link command is sent to the wireless communication management unit; after the communication link is established, the wireless data acquisition unit receives monitoring data sent by the wireless communication management unit, and when the monitoring data are received, the communication link is disconnected,and the wireless data acquisition unit power supply is disconnected by the unmanned aerial vehicle. Based on the unmanned aerial vehicle, the wireless data acquisition unit, a low-power consumption data acquisition unit, the wireless communication manager and the like, the automatic safety monitoring system with low equipment cost and low operation and maintenance cost is constructed, and the automatic safety monitoring system has the advantages of strong feasibility and good application prospect.

The invention relates to an ultra-thick hydrogen-free diamond-like film and a preparation method thereof. A Cr bonding layer coats the upper part of a metal matrix, the upper part of the Cr bonding layer is provided with a C/C multilayer composite film, and the C/C multilayer composite film is formed through alternating deposition of a soft C film and a hard C film. The preparation method comprises the following steps of (1) pretreatment of a workpiece, (2) ion cleaning, (3) preparation of the Cr bonding layer, and (4) preparation of the C/C multilayer composite film. According to the film andthe preparation method thereof, the soft and hard alternating C/C multilayer film is prepared by controlling a bias voltage of the matrix by using a vacuum ion plating technology, all layers of interfaces are matched with one another, the film has good binding force and toughness, the induced effect generated by ion bombardment under high bias voltage causes a SP2 bond in the film to be transformed to a SP3 bond, and the wear resistance of the diamond-like film is enhanced. According to the homogeneous multi-layer structure, the hardness of the film is up to 40 GPa, the coefficient of friction is less than 0.15, and good durability is achieved, so that the engineering application range of the diamond-like film is expanded.

The invention discloses a method of using urban domestic waste incinerator residue to produce lightweight foam concrete. The method comprises the steps of 1) weathering urban domestic waste incinerator residue, and washing with water; 2) pouring the materials other than a foaming agent and water, into a stirrer, and mixing well; 3) adding quantitative super-pure water and prepared sodium alginateinto the stirrer; 4) adding the foaming agent during stirring, pouring the mixed slurry immediately into a produced mold, covering the surface with a layer of preservative film, and allowing standingfor foaming; 5) removing the mold, storing the foam concrete in a curing tank for curing so as to obtain the lightweight foam concrete with good mechanical properties. The method provides a wider engineering applicable range for incinerator residue, has the advantages of environmental friendliness, low price, good simplicity and the like, and is worthy of application in the large-scale productionof lightweight foam concrete.

The invention discloses a pin tool used for friction stir welding and a current carrying friction stir welding method, wherein the pin tool comprises a pin tool body arranged on a friction welder and a tool pin arranged at the lower part of the pin tool body; the pin tool body is connected with the welder in a clamping way; the pin tool is characterized by being further provided with a forced cooling device, a current carrying device, a gas shielded device, a sensing device, sealing equipment and an insulating device. The invention has the advantages of high efficiency, low cost, high stability and excellent quality, breaks the limitation of conventional friction stir welding technology, overcomes the dependency of the pin tool for friction stir welding of the high melting point metal on high-quality materials and complex preparation technique, enriches the quality control methods of friction stir welding of the low melting point light alloy, realizes the effective and reasonable matching of high quality and low cost of friction stir welding and improves the friction stir welding technology, thus broadening the range of engineering application in the fields of solid phase welding and surface engineering.