73results about How to "Reasonable parameters" patented technology

The invention relates to a supporting method of a roadway in a coal mime, particularly to a supporting method of a permeable soft broken rock stratum roadway. The supporting method aims at solving the problems that soft broken rock stratum roadways especially permeable soft broken rock stratum roadways are poor in supporting effect, high in cost and the like. The supporting method comprises the steps of first concrete spraying; combined support through high strength deformed steel bar anchor rods and diamond metal nets; anchor cable installation; secondary concrete spraying; installation of chemical pulp grouting anchor rods; installation of cement slurry grouting anchor rods.

The invention relates to a method for cladding a copper alloy layer on the surface of a steel substrate by laser brazing. A method of feeding powder by argon gas, cladding by laser brazing and vacuum heat treatment is used on a laser machine for cladding a copper alloy layer on the surface of the steel substrate by laser brazing; the laser machine is used for remelting and curing the surface of the steel substrate firstly; and laser beams irradiate in all directions according to the geometric locus of ring steel set by computer programs to enable copper alloy powder and borax powder to be melted and cured on the surface of the steel substrate to form the copper alloy layer. The thickness of the copper alloy layer is 0.5mm; the average microhardness of the copper alloy layer is 375HV0.2 which is 2 times of the average microhardness of the steel substrate; and compared with the steel substrate, the wear resistance of the copper alloy layer is improved by 52.8%, and the corrosion resistance of the copper alloy layer is improved by 45.3%. The method has advanced processes and reasonable parameters; the metallographic structure of the cured and melted layer is compact and firm and can not fall off easily; and the method can be used for cladding alloy layers on the surfaces of steel substrates of various molded surfaces by brazing and can be used for cladding alloy layers on various molded surfaces and special-shaped non-standard molded surfaces, thereby greatly improving the performance of the surfaces of the steel substrates.

The invention provides a method and a system for checking an electric power system model based on hybrid dynamic simulation. The method comprises the following steps: collecting the active power and the reactive power of circuits connected with all PMU installation nodes in a subsystem to be checked, and obtaining a time series of measurement values of the input active power and reactive power ofthe PMU installation nodes; collecting voltage amplitude values and voltage phase angles of all PMU installation nodes in the subsystem to be checked, taking the voltage amplitude values and the voltage phase angles as the input of hybrid dynamic simulation containing multiple slack nodes, and obtaining a time series of calculated values of the input active power and reactive power of the PMU installation nodes; comparing the time series of the measurement values and the time series of the calculated values, and then judging whether the structure and parameters of the subsystem to be checked are reasonable or not. The invention avoids the existence of median errors without introducing any new element, and therefore, whether the structure and parameters of the electric power system model are reasonable or not can be accurately judged.

The invention discloses a network security situation awareness model and method based on CE-RBF. The model comprises a data preprocessing module, a situation calculation module, a parameter optimization module and a situation prediction module. The method comprises the following steps: collecting data sets from different sources, and extracting principal component information for situation awareness to obtain asset attack threat data and system state data; calculating a risk value according to the asset attack threat data of the network equipment, and evaluating the security situation of the whole network; determining initial parameters of the RBF neural network, establishing an optimization objective function, optimizing the parameters in the optimization objective function by using a CEalgorithm, substituting the optimal parameter set into the RBF neural network after finding the optimal parameter set, and training by using historical network situation values as sample data; and performing situation prediction by using the trained RBF neural network. According to the method, the problem of parameter optimization in the high-dimensional model is solved by utilizing the efficientoptimization capability of CE, and the prediction capability of the neural network is improved.

The invention discloses a method for supporting an ultra-thick and fluffy coal roadway, aiming at solving the problem that the ultra-thick and fluffy coal roadway is hard to support since the coal bed is fluffy, easy to smash, and easy to nick, and the roof is easy to fall. The mode for supporting the ultra-thick and fluffy coal roadway provided by the invention is changed into various multi-support and union-support mode from the single anchor rod support mode and erected steel shed support mode, in particular, the union-support of an anchor rod, an anchor cable, a steel belt and a mesh. The method has the unique advantage that the reinforcing theory and the suspending theory can be combined with each other, and the stability of the ultra-thick and fluffy coal roadway can be controlled. The method has the advantages of being good in support effect, reasonable in parameters, simple in construction, lower in cost, safe, reliable, better in work environment and the like, and is particularly suitable for the support of the ultra-thick and fluffy coal roadway.

The symmetrical admission and exhaust cam for three cylinder gasoline engine has profile line with the work section equation of h=(hmax-hr)(1+c2A2+c4A4+cpAp+cqAq+crAr+csAs), where, h is the lift of the cam work section, hmax is the maximum lift and equals to 7.3-7.5 mm, hr is the lift of cam buffer section and equals to 0.3-0.35 mm, A is cam angle, p, q, r and s are indexes, c4=0.1, p=14, q=28, r=42, and s=56. The cam has base circle diameter of 33 mm, contact width to the jib of 10 mm, total contact angle of 167-172 deg, work section angle of 121 deg, and buffer section angle of 46-52 deg. The symmetrical admission and exhaust cam has the advantages of capacity of reaching excellent dynamic characteristic of gasoline engine and smooth running of the valve mechanism, and small thickness.

The invention relates to a casting spliced diamond composite sheet anchor rod drill bit and a connecting sleeve thereof. Although certain effects on improving and perfecting the conventional drill bit are achieved, the problems of difficulty in assembling and disassembling a drill bit and complex processing technic are not solved. In the invention, the lower end of a drill bit body is connected with a connecting rod; the lower end of the outer wall of the connecting rod is provided with a connecting pin hole; two wing end faces of cutting wings are formed oppositely and symmetrically at 180 degrees; the tops of the cutting ends of the cutting wings are circular-arc-shaped, and smoothly extend to the gauge protection ends of wing parts; two circular medium channels are formed between the two cutting wings, are formed outside the drill bit body, and extend to the bottom of the outer wall of the connecting rod; and an acute angle is formed between a welding surface and a drill bit body vertical surface. According to the invention, the early-stage manufacturing flow of the drill bit is simplified, the production efficiency is increased, the drill bit is more convenient to assemble and disassemble, and damage to drill bit cutting teeth in the assembling and disassembling processes is avoided.

The invention provides an electromagnetic anti-interference device for a sub-module controller of a flexible DC transmission valve, belonging to the field of electromagnetic anti-interference design of a flexible DC transmission system. The device improves the electromagnetic anti-interference ability of each sub-module of the flexible direct current transmission system, and has good versatility, so that all control boards of the whole system can use the device, reducing the cost of the whole system. The anti-interference device conducts targeted selection of varistors, transient voltage suppression diodes (TVS), electrolytic capacitors, X capacitors, common mode inductors and other devices to match the parameters, and then concentrates them in one module for packaging. The module has two input ports and two output ports. The device of the invention centrally encapsulates various devices in one module, with reasonable parameter matching, small overall volume, high integration, and reliable performance; it can be applied to the power input ports of various circuit boards, directly welded, and very easy to install. convenient.

The invention relates to the technical field of wave simulation and discloses a push plate type wave maker. A wave generating unit comprises a supporting frame, a servo driver, a servo motor, a coupler, a ball screw, a screw nut, a linear guide rail, a sliding block and a wave pushing plate; the ball screw is arranged on the supporting frame in a penetrating mode; one end of the ball screw is connected with the servo motor through the coupler; the servo motor is electrically connected with the servo driver; the servo driver controls starting, stopping, rotating speed and steering of the servomotor; the ball screw is sleeved with the lead screw nut; the upper end of the sliding block is fixedly connected with the lower end of the lead screw nut; the lower end of the sliding block is fixedly connected with the upper end of the wave pushing plate; and the linear guide rail is installed on the lower end face of the supporting frame and slides on the linear guide rail. By means of the pushplate type wave maker, waves which are reasonable in parameter and accord with expectation can be manufactured. The push plate type wave maker is suitable for wave simulation experiments, and is highin wave making accuracy.

The invention provides a determining method of the mining roadway critical width. The method includes the steps of determining main parameters of a Platt's arch theory, calculating mining roadway surrounding rock pressure, and determining the mining roadway critical width. The deformation of a broken rock-covering mining roadway is effectively controlled, an I-beam shed supporting technology is adopted according to the occurrence features of the roadway, the formation principle of the broken rock-covering Platt's arch structure is analyzed, and the mining roadway critical width is researched.The invention belongs to the technical field of roadway construction.

The design method of radial magnetic bearing with permanent magnetic bias outer rotor has the displacement rigidity of the magnetic bearing as main consideration, and the maximum bearing capacity, saturation magnetic induction and tankful rate as restraint conditions. Compared with available design method with optimal work point of the permanent magnet as target, the method of the present invention has the advantages of easy control of magnetic bearing, reasonable permanent magnet size, high accuracy, and being simple and practical. The design philosophy of the present invention may be used in design of different kinds of radial magnetic bearing with permanent magnetic bias outer rotor.

The design method of radial magnetic bearing with permanent magnetic bias inner rotor has the displacement rigidity of the magnetic bearing as main consideration, and the maximum bearing capacity, saturation magnetic induction and tankful rate as restraint conditions. Compared with available design method with optimal work point of the permanent magnet as target, the method of the present invention has the advantages of easy control of magnetic bearing, reasonable permanent magnet size, high accuracy, and being simple and practical. The design philosophy of the present invention may be used in design of different kinds of radial magnetic bearing with permanent magnetic bias inner rotor.

The invention relates to an excavator provided with an auxiliary traction device of a hydraulic winch. A console of the excavator is connected with a control valve group of an auxiliary traction mechanism of the hydraulic winch; the rear part of the excavator is connected with a connecting bottom plate of the traction mechanism; a bottom seat of the winch is arranged on the connecting bottom plate; the hydraulic winch is connected onto the bottom seat; one end of a fixed frame is connected with a conveyor of the excavator and the other end thereof is connected with the connecting bottom plateof the traction mechanism; and one end of a steel wire rope of the hydraulic winch is fixed on the side wall of an underground tunnel or the bottom plate. The excavator can realize independent operation in large-gradient laneway, reduce labor intensity, improve working efficiency and improve excavating speed.

The invention provides an environment-friendly oil wax discoloring cattle-hide sofa leather and a processing process thereof. The environment-friendly oil wax discoloring cattle-hide sofa leather solves the technical problems that the structure of existing discoloring leather is too simple, cannot be used under various environments, does not have a processing process, and the like. The environment-friendly oil wax discoloring cattle-hide sofa leather comprises a cattle-hide base layer, a discoloring paint layer, an oil wax layer and a processing layer. The environment-friendly oil wax discoloring cattle-hide sofa leather has the advantage of being good in using effect.

The invention discloses a method for preparing a multi-layer antibacterial stainless steel material. The antibacterial stainless steel material is basically composed of a double-layer structure of steel forming a base and steel forming a surface antibacterial layer. A double-layer composite material with the base material and the surface layer material metallurgically bonded is formed through a double-layer composite casting method, the double-layer composite board obtained through continuous casting is subjected to fixed-length cutting to obtain a double-layer slab with a fixed length, rolling is performed to obtain the antibacterial stainless steel material, then, heat treatment, rolling and stamping are performed to obtain a semi-finished product, and the semi-finished product is subjected to antibacterial heat treatment, rough grinding, fine grinding polishing, cleaning, drying and packaging to obtain a finished product. According to the method, the processing process has a low cost, and the antibacterial layer has a large thickness. Besides, the base and the surface antibacterial layer are composed of stainless steel components, metallurgical bonding formed in the casting process is high in strength and firm, wear resistance is achieved, and the service life is long.

The invention relates to a device and method for electric machining with a circular electrode and ultrasonic waves used for cutting. A metal wire electrode used for electrode-wire cutting is replaced by the circular electrode so that the problem of wire penetration in the process of cutting can be solved. According to the wire passing speed in the process of wire-electrode cutting, a rotary speed is provided for the circular electrode so that the ionization electricity discharge phenomenon evenly and continuously caused by the circular electrode and metal can be generated, and therefore cutting machining is conducted on a workpiece. A prior wire-electrode cutting power source is improved and optimized so that the electricity discharge requirement of the circular electrode can be met. The parameters such as the rotary speed and the feeding amount of the circular electrode are controlled through an automatic electric control system so that automatic control can be achieved. The device control parameters are reasonable and the machining accuracy is high. Ultrasonic vibration is exerted on the workpiece so that the slag discharging function can be achieved and therefore fine slag generated by electricity discharge of the electrode and the workpiece is rapidly separated from the machined portions.

The invention provides a method for producing a burnt-out velvet fabric, which belongs to the technical field of textile fabrics. It includes the following steps: step (1), select the yarn used, the type of yarn used is polyester semi-gloss FDY, polyester semi-gloss DTY; step (2), use warping machine for warping; step (3), Use the warp knitting machine for weaving. After the head of the warping machine is adjusted, weaving production should be carried out on the warp knitting machine; step (4), arrange and replace the variety weaving process according to the designed production process sheet; step (5), check ; Step (6), blank inspection; Step (7), blank stacking; Step (8), napping; Step (9), shaping; Step (10), dyeing; Step (11), burnt-out; Step ( 12), post-processing. The invention improves the quality of the burnt-out velvet fabric, has good pattern effect, simple production process and good stability.

The invention discloses a life-saving descent control device, which comprises a left shell and a right shell, wherein the right end face of the left shell is provided with a disc-shaped left circular cavity; a left counter bore used for installing a bearing is at the central position of the left shell, which is located on the left circular cavity; three planetary gear mounting shafts are arranged in the left circular cavity; the left ends of the three planetary gear mounting shafts are connected with the left shell into a whole; the outer edge of the right end of the left shell is provided with a left flange; the left end face of the right shell is provided with a disc-shaped right circular cavity; a right counter bore used for installing the bearing is arranged at the central position of the right shell, which is located on the right circular cavity; the outer edge of the right end of the right shell is provided with a right flange; the left end face of the right flange and the right end face of the left flange are pasted; a placement cavity is arranged between the right flange and the left flange; and the placement cavity is communicated with the outside through two steel wire rope perforations. The invention aims to provide the life-saving descent control device which is small in size, high in strength and safe and reliable in performance.

The invention discloses a bidirectional fresh air purifier. The bidirectional fresh air purifier comprises a shell, an outdoor air inlet, an outdoor air outlet, an indoor air return port, an indoor air supply port, a heat exchange core and an electric control box; the heat exchange core is provided with a fresh air hole channel and an air return hole channel; a fresh air duct is provided with theoutdoor air inlet, the fresh hole channel, an air inlet flow guide plate, an air inlet fan, a fresh air filter element and the indoor air supply port; an air return channel is provided with the indoorair return port, an air return filter element, the air return hole channel, an air return flow guide plate, an air return fan and the outdoor air outlet; the air inlet flow guide plate comprises an air inlet side flow guide inclined plate, a main air inlet guide plate and an air supply side flow guide inclined plate; the air return flow guide plate comprises an air return side flow guide inclinedplate and a main air return flow guide plate; and the electric control box comprises a control circuit board and an electrical component. The bidirectional fresh air purifier has the advantages of being relatively high in heat exchange rate and air purification rate, exquisite in structure, reasonable in arrangement, long in service life and low in cost; and air guide rings are additionally arranged, and therefore the pressure loss can be reduced, and the noise is low.