456results about How to "Meet lightweight requirements" patented technology

The invention discloses an elastic membrane-type low-frequency sound insulation metamaterial structure which comprises two frames and a silicone rubber elastic membrane arranged between the two frames. A plurality of mass blocks are pasted on one side of the silicone rubber elastic membrane, and the mass blocks are separated with one another through the frames. The elastic membrane-type low-frequency sound insulation metamaterial structure solves the problems that a traditional sound insulation material is poor in low-frequency sound insulation performance, large in thickness, heavy in mass and the like and meets the five requirements of low-frequency sound insulation, wherein the five requirements include the low-frequency sound insulation requirement for noise below 500 Hz, the broadband requirement, the requirement for low structural thickness and low weight, and the requirement of easy design processing and low processing difficulty. The elastic membrane-type low-frequency sound insulation metamaterial structure has excellent low-frequency sound insulation performance, can effectively isolate low-frequency noise ranging from 200 Hz to 500 Hz, and can be applied to various carrying tools such as planes, automobiles, trains and ships and various types of building decoration. A brand new sound insulation solution is provided for creating low-noise working and living environments.

The invention belongs to the field of aluminum-based composite material and preparation technology thereof and in particular discloses a ceramic particle reinforced aluminum-based gradient composite material, a preparation method thereof and a device used by the method. The composite material uses aluminum alloy as a matrix; the volume fractions of ceramic particles serving as a reinforcement material in the surface layer and the bottom layer are between 30 and 40 percent and between 0 and 5 percent respectively; the ceramic particles perform continuous gradient variation from the surface layer to the bottom layer; and the preparation method comprises the following steps: introducing the ceramic reinforced particles to a high-pressure airflow channel by a discharge amount regulation device to form a solid phase flow and a gas phase flow; atomizing molten aluminum alloy liquid, mixing the molten aluminum alloy liquid and the ceramic particles of the solid phase flow and the gas phase flow, and precipitating the mixture on a deposition matrix to prepare a deposition billet; and controlling the discharge amount regulation device and output air pressure through a programmable logic controller according to the height information of the deposition billet to obtain the ceramic particle reinforced aluminum-based gradient composite material. The preparation method of the invention has convenient operation and high automation degree; and the prepared composite material has the advantages of light weight, high wear resistance and anticorrosion of the surface and the like.

The invention relates to a method for producing a magnesium alloy sheet, comprising the following steps: casting step: fused magnesium alloy which is added with grain refiner and has the solid phase with weight proportion between 10% and 15% is supplied between at least one pair of rollers, and a board with the thickness of 4.0-6.0mm is formed by continuous casting at the temperature that is 40-50 DEG C higher than the fusion temperature of the alloy; extruding step: the magnesium alloy board which is formed by continuous casting is further extruded into a wave-shaped magnesium board, and the extruded magnesium board has the thickness within the range of 2.0-3.5mm; flattening step: the wave-shaped magnesium board is rolled and unfolded to be a tabulate magnesium board; rolling step: the tabulate magnesium board is rolled to be the thinner magnesium alloy sheet with the width of 450-500mm and the thickness of 0.5-1.5mm; surface treatment step: surface coating is carried out on the magnesium alloy sheet to prevent oxidation corrosion. The thinner magnesium alloy sheet produced by the method can be applied to 3C products.

The invention provides a method for producing thin REH380LA steel based on an ESP thin slab continuous casting and rolling process. The method includes the steps that raw materials are selected, and the raw materials comprise, by mass, 0.04-0.10% of C, 0.15-0.50% of Si, 0.50-0.10% of Mn, 0.008-0.04% of Alt, 0.008-0.04% of Ti, 0.010-0.030% of Nb, 0.0010-0.0030% of S, 0.0080-0.0130% of P, no more than 0.0035% of N, and the balance Fe; the raw materials are sequentially smelted in a converter, an LF furnace and an RH furnace; molten steel obtained after refining in the RH furnace is manufactured into hot-rolled strip steel of different thicknesses through an ESP production line, wherein, in the ESP production line, the temperature of a rough rolling outlet is 920-980 DEG C, and the temperature of a fine rolling outlet is 800-870 DEG C; and the hot-rolled strip steel is cooled to 530-680 DEG C, and then the strip steel enters a winder to be wound and stored in a warehouse. By means of the method, the problems that subsequent cold rolling and annealing are required in the traditional production technology are solved.

The invention discloses a large-sized air-inflating thin film light-shielding cover structure with expanded space. The large-sized air-inflating thin film light-shielding cover structure comprises a light-shielding cover base fixedly connected with a space camera base, and folding cylinders distributed along the light-shielding cover base; the folding cylinders are sleeved with an air-inflating pipe framework; the large-sized air-inflating thin film light-shielding cover structure also comprises adjusting rope-rods which are expanded and pulled on the surface of the air-inflating pipe framework and used for performing unfolding control of the air-inflating pipe framework, and a light-shielding thin film which is glued on the outer side of the air-inflating pipe framework to form rope net reinforcement of the light-shielding cover; and air-inflating tanks which are corresponding to and connected with the air-inflating pipe framework are arranged on the light-shielding cover base, wherein the air-inflating tanks and the folding cylinders on the light-shielding cover base are fixedly connected with the light-shielding cover base in a manner of inward arrangement in sequence based on the peak position of a regular n polygon in the radial direction. By adoption of the large-sized air-inflating thin film light-shielding cover structure, feedback control can be performed by only adjusting the rope length/rope force in the unfolding process, without needing other driving and sensing apparatuses; and in addition, the large-sized air-inflating thin film light-shielding cover structure has the advantages of simple structure, light weight, small size, low storage space requirement, low manufacturing cost and the like, and can satisfy the light weight requirement of a spacecraft.

The invention discloses a hydro-thermal preparation method for spherical boric acid yttrium doped europium fluorescent powder in a hollow structure. 0.01 to 1.0 mole/liter yttrium ions, europium ions and boric acid are mixed, the mole ratio of the yttrium ions to the europium ions to the boric acid in the mixed solution is 19/1/20, organic topography induction reagents are added into the mixed solution, the ratio of the mol number of the added organic topography induction reagents to the sum of the mol number of the yttrium ions and the europium ions is 3/2, 1 to 8 milliliters of nucleating reagents are added into the mixed solution, and suspending liquid is obtained; the alkali liquor is used for regulating the pH to be 8 to 10; the suspending liquid is moved into a 100mL reaction kettlefor carrying out hydrothermal reaction; and the heat treatment is carried out on powder products after the hydrothermal reaction, and the spherical fluorescent powder in the hollow structure is obtained. The spherical boric acid yttrium doped europium fluorescent powder has the smaller specific gravity because of the adoption of the hollow structure, and requirements of luminescent devices on light weight of fluorescent luminescent materials can be met.

The invention relates to a planetary gear transmission device based on a conjugate curve herringbone gear, and belongs to the technical field of gear transmission. The planetary gear transmission device comprises a sun gear, a planet gear, a planet carrier and an inner gear ring. The sun gear and the planet gear are driven by the conjugate curve herringbone gear to form a sun gear and planet gear engagement pair, and contact curves formed by tooth surface engagement points are conjugate curves. The planet gear and the inner gear ring are driven by the conjugate curve herringbone gear to form a planet gear and inner gear ring engagement pair, and contact curves formed by tooth surface engagement points are conjugate curves. According to the planetary gear transmission device based on the conjugate curve herringbone gear, few-tooth large-modulus optimization design can be carried out, the whole machine weight is effectively reduced, and the requirement for low weight is met; the bearing capacity is high, no axial force influence exists in the gear surface engagement process, relative gear surface sliding is reduced through point contact engagement, the transmission efficiency is effectively improved, and the whole machine service life is effectively prolonged.

An embodiment of the invention provides a skirt plate structure of a rail traffic vehicle body and a forming method of the skirt plate structure, and belongs to the technical field of composite structure forming. The skirt plate structure of the rail traffic vehicle body comprises an outer skin layer, a honeycomb core layer, an inner skin layer and a support frame, wherein upper and lower surfacesof the honeycomb core layer are connected with the outer skin layer and the inner skin layer respectively, a mounting groove is formed in the inner skin layer and the honeycomb core layer, the support frame is located in the mounting groove and connected with the outer skin layer, the outer skin layer and the inner skin layer are made of a composite material, and the support frame is made of a metal material or a composite material. The skin layers are made of the composite material, uniform radian of the inner and outer skin layers is realized by the honeycomb core, and surface precision ofthe large curved skirt plate structure is guaranteed; mechanical strength of the large skirt plate structure is guaranteed by the support frame; with adoption of the composite materials and a hollow structure, the weight of the large skirt plate structure is reduced by about 20%, and the requirement for the light vehicle body is met.

The invention discloses a traction bar ball assembly, an assembling tool and an assembling method for the traction bar ball assembly. The traction bar ball assembly comprises a traction bar ball joint and a traction bar ball, wherein the traction bar ball comprises a traction bar ball body and turnup structures arranged at the two ends of the traction bar ball body, the turnup structures and the traction bar ball body are integrally formed, and the turnup structures at the two ends of the traction bar ball body are matched with the traction bar ball joint to limit the traction bar ball joint in the traction bar ball. The turnup structures arranged at the two ends of the traction bar ball and integrated with the traction bar ball are buckled on the traction bar ball joint, and the traction bar ball joint is limited in the traction bar ball, so that the traction bar ball assembly is simple in structure and free from maintenance, the manufacturing cost of the traction bar ball assembly is lowered, the weight is relatively light, and the requirements of light weight is completely met. When the assembling tool and the assembling method are used to assemble, the operation is simple, the assembling time is shortened, and the assembling efficiency is improved.

The invention discloses a cubesat brake sail de-orbit device. The cubesat brake sail de-orbit device is composed of two completely identical cubesat brake sail de-orbit sub-devices. Each cubesat brake sail de-orbit sub-device comprises a de-orbit device body and a partition board arranged on the top of the de-orbit device body, wherein the de-orbit device body is of a central symmetry structure and comprises a main frame, an upper end cover, a sail storage chamber guide rail, a Hall sensor, a base plate and two expanding mechanisms, the main frame is Z-shaped, the main frame is divided into two identical chambers with the center of the main frame as the symmetry center, and the two expanding mechanisms are arranged in the two chambers respectively. Four film sails are expanded in four directions by means of tape spring masts to increase the normal sectional area of satellite movement, so as to successfully solve the problem that a cubesat stays on the original track for a long time after fulfilling a task and becomes space debris.

The invention discloses a composite energy absorption tube machining device which comprises a rectifier (1), a resistor (2), a switch (3), a capacitor (4), a boosting transformer (5), an upper fixing plate (6), a fixing bolt (7), a pressing block (8), a mould frame (9), a constraint mould (11), a coil (12), a lower fixing plate (13), a T-shaped platform (14), an exhaust vent (16), a fixing groove (17) and a wire hole (18). Compared with a hydraulic forming method and a mechanical bulging method, a composite metal energy absorption forming method based on the electromagnetic forming principle and used in the composite energy absorption tube machining device is high in machining efficiency and high in the pipe fitting forming speed and enables composite metal tubes to be formed under the high strain rate; due to the fact that the high strain deformation process can be used for forming metal materials which are deformed difficultly through a conventional method, the plasticity of the metal materials is greatly improved, and the yield strength of the materials is greatly improved. Different wave forms and reinforcing ribs can be formed by changing the shape of the constraint mould in a mould body, and the machining flexibility is high.

The invention provides a gas cylinder fixing rack, a gas cylinder frame, an LNG gas supply system adopting the frame, and a vehicle. The gas cylinder frame comprises an external fixing connection portion, an internal holding portion and a supporting connection part arranged between the external fixing connection portion and the internal holding portion, the fixing connection portion is fixedly connected with a vehicle body or other parts, the holding portion internally holds and fixes a gas cylinder, the supporting connection part is connected to the fixing connection portion and the holding portion, the fixing frame is evenly divided into at least two modularized mounting racks, and the modularized mounting racks have a same shape. Batch production and rapid connecting use are realized, so the cost is saved, and the precision and the quality stability of the frame are improved.

The invention discloses a wind resistance braking device applied to a high-speed train. Speed brakes for braking and decelerating by using air resistance are arranged on a locomotive of the high-speed train and the top outer surface of each carriage. During conventional braking or emergent braking of a train running at a high speed, the speed brakes are opened, and pressure difference resistance generated by air flow is taken as main braking power for conventional braking and auxiliary braking power for emergent braking, so that the comfort of passengers is improved during conventional braking of the high-speed train, and friction loss caused by braking with a brake disc is avoided; meanwhile, the braking distance of emergent braking is shortened, and the running safety of high-speed train is improved. Moreover, the air resistance is in direct proportion to the square of the speed, so that the effects of the speed brakes are best for the train running at a high speed. Meanwhile, the air resistance is generated by air power without consuming energy additionally, so that pollution is prevented; and moreover, the wind resistance braking device is simple in structure, and is easy to implement.

The invention belongs to the technical field of electric vehicle transmission, and specifically relates to a drive system of a double-motor double-shaft input speed changing box and a gear shifting control method of the drive system. The system comprises a drive motor I, a drive motor II and an electronic control mechanical automatic transmission. The electronic control mechanical automatic transmission comprises a first-gear gear set, a second-gear gear set, a third-gear gear set, a fourth-gear gear set, a coupling sleeve I, a coupling sleeve II, a transmission input shaft I, a transmission input shaft II and a transmission output shaft. The electronic control mechanical automatic transmission provides three gears for power output of the drive motor I and the drive motor II. By means of coupling of the drive motor I, the drive motor II and the electronic control mechanical automatic transmission and drive of the drive motor I and the drive motor II, shifting of three gears can be achieved. According to the system, the arrangement space of a finished vehicle is saved, the gears do not affect one another, the requirements for bearing and gear rotating speed are not high, and the life is long.

The invention provides an automobile collision energy absorbing box capable of achieving high-efficiency and stable energy absorption. The automobile collision energy absorbing box comprises flanges,a square thin-walled outer shell, lattice structures and a sandwich plate; the flanges are arranged at the upper and lower ends of the square thin-walled outer shell, the lattice structures are arranged on the upper and lower ends of the sandwich plate, and the lattice structures and the sandwich plate are integrally arranged in the square thin-walled outer shell; each lattice structure is formedby distributing aluminum tubes according to the body square diagonal; the sandwich plate comprises two layers of carbon fiber sheets and a honeycomb structure arranged between the two layers of carbonfiber sheets; the honeycomb structure is formed by staggered distribution of regular octagons and regular squares; the lattice structures and the sandwich plate are connected into a whole through spot welding, and the square thin-walled outer shell and the flanges are connected into a whole through spot welding; and the flanges are connected and fixed to a transverse beam and a longitudinal beamof an automobile through bolts. The automobile collision energy absorbing box solves the problems that a traditional energy absorbing box is unstable in energy absorption, poor in multi-angle impact adaptability, discontinuous, low in efficiency and the like.

The invention discloses a preparation method of an aluminum alloy casting with cavity filled with foamed aluminum. The preparation method comprises the following steps of providing formed foamed aluminum with soldering flux on the surface; fixing the formed foamed aluminum with the soldering flux on the surface in a mold; and casting through using a molten aluminum alloy. According to the preparation method of the foamed aluminum filled aluminum alloy cavity casting, the foamed aluminum is used for replacing a traditional sand core, so that higher strength is obtained while lightweight requirements are met, procedures of sand vibrating, shakeout, sand blowing, sand recovering and the like are further omitted, and the production efficiency is improved.

The invention discloses a liquid-cooled fixing structure for a battery system. The liquid-cooled fixing structure comprises an upper water cooling plate and a lower water cooling plate, wherein the upper water cooling plate and the lower water cooling plate are arranged up and down and are connected with each other, each of the interior of the upper water cooling plate and the interior of the lower water cooling plate is provided with a medium flow passage for a cooling medium to flow, and the medium flow passage inside the upper water cooling plate communicates with the medium flow passage inside the lower water cooling plate to form a circuit; lower installation bases fixed to two sides of the lower water cooling plate are arranged on two sides of the lower water cooling plate, the lower installation bases on the two sides are matched with each other, a lower installation surface for a battery module to install is formed above the lower water cooling plate, and a lower fixing mechanism for fixing the battery module is arranged on the lower installation surface. According to the liquid-cooled fixing structure, a fixing device and a cooling device of the battery module are combined into one, the maximum utilization of system inner space is realized, the lightweight requirement of the system is met, and simultaneously the reliability requirement of the structure is further met.

The invention relates to the machining field of car components, particularly to an auxiliary frame and a forming method thereof. The car auxiliary frame is formed by directly molding a uniform-wall-thickness cylindrical pipe and is of one piece. The forming method comprises the following steps: firstly selecting the uniform-thickness cylindrical pipe as a raw material, and then bending the round pipe to obtain an elbow pipe; then pre-molding the elbow pipe, hydraulically molding the pre-molded frame pipe, and finally cutting the end part of the formed frame to obtain a needed component. According to the auxiliary frame and the forming method, one round pipe is sequentially bent, pre-molded and hydraulically-molded to finally obtain the needed auxiliary frame. Compared with the auxiliary frame component manufactured in a traditional stamping welding way, the forming method has advantages of high production efficiency, fewer molds, light component weight, high strength and low comprehensive component cost; while the material cost is reduced, the light-weight requirement of vehicles can be realized, and the product competence can be improved.

The invention provides a seat and a vehicle, the seat includes: a seat frame and at least one functional module, the seat frame includes: a back frame and a seat cushion and pan assembly, the back frame includes: an upper and lower horizontal plate and two side plates, The seat pan is arranged on the front side of the seat cushion, the seat cushion includes two seat cushion side panels and two linkage rods spaced front and rear, at least one functional module is arranged on the seat frame and includes: seat cushion seat pan assembly front and rear adjustment mechanism, shoulder adjustment Mechanism, backrest frame angle adjustment mechanism, seat basin height adjustment pump. Therefore, the seat structure is simple and light in weight, the seat can meet the lightweight requirements of the vehicle, and the seat can be matched with various adjustment functions.

The invention discloses an electric vehicle wheel side driving system and a driving method. The electric vehicle wheel side driving system comprises a deceleration driving system disposed in a wheel hub and a direct driving system fixedly connected with the wheel hub and directly driving a wheel. The electric vehicle wheel side driving method is realized via the electric vehicle wheel side driving system. By the use of the electric vehicle wheel side driving system and the driving method, motors of various systems can be guaranteed to work within the rated power and motor output efficiency can be ensured; demands for normal power can be met and overall vehicle weight can be reduced; large transmission ratio is achieved and high mechanical transmission efficiency is provided; and the electric vehicle wheel side driving system possesses compact structure, facilitates spatial arrangements and meets requirements for light weight of the electric vehicle.