315results about How to "Improve energy absorption" patented technology

The invention discloses a heat exchange structure design method based on three-period minimal curved surface space subdivision. The invention provides a heat exchange structure design method based on a three-period minimal curved surface (TPMS) structure, and aims to improve the performance of efficient heat dissipation equipment. According to the method, by generating the Gyandroid structure and conducting multi-layer subdivision, the fluid flowing path is optimized, and the heat exchange efficiency is improved. Meanwhile, by adopting the lightweight composite material for construction, the structural weight is remarkably reduced, and the composite material is suitable for high-efficiency heat dissipation application in the fields of new energy automobile battery heat management, electronic equipment, aerospace and the like. Through finite element simulation analysis, the heat dissipation performance and mechanical strength of the structure are verified, efficient heat dissipation can be achieved in a limited space, and the service life of equipment is prolonged.

The utility model belongs to the technical field of anti-collision beams, and particularly relates to an anti-collision beam, a vehicle body front structure and a vehicle. The anti-collision beam comprises a main anti-collision beam, a first energy absorption box and a second energy absorption box, the first end of the first energy absorption box is connected with the main anti-collision beam, and the second end of the first energy absorption box is suitable for being connected with a longitudinal beam of the vehicle; the first end of the second energy absorption box is installed on the main anti-collision beam, and the second end of the second energy absorption box is suitable for transmitting stress to the longitudinal beam through an inclined strut of the vehicle. The second energy absorption box deflects inwards and collides with the inclined strut on the longitudinal beam, the inclined strut serves as a collision structure to transmit force to the longitudinal beam, the force transmission path of small deflection collision is increased, more force is guided to the longitudinal beam, the energy absorption effect of the longitudinal beam is improved, the collision performance of the whole vehicle is improved, and the invasion amount of a barrier to a passenger compartment is reduced.

The invention belongs to the technical field of battery protection, and particularly relates to an energy-absorbing anti-collision material and a preparation method thereof. The energy-absorbing anti-collision material comprises an energy-absorbing layer and a layer plate which are sequentially stacked, the energy-absorbing layer comprises a polyurethane energy-absorbing layer, and preparation raw materials of the polyurethane energy-absorbing layer comprise a premix and a curing agent; the premix comprises polyether glycol, polyether polyol, a chain extender, a cross-linking agent, a filler, a coupling agent, a foaming agent, an emulsifier and a catalyst; the curing agent comprises diisocyanate; the molar ratio of hydroxyl groups in the premix to isocyanate groups in the curing agent is 1: (1-1.1). According to the invention, the energy absorption layer and the laminate are compounded, and the energy absorption layer comprises the non-Newtonian fluid shear thickening composite material and can absorb and disperse impact force, so that the overall anti-collision performance of the battery chassis is improved, and the service life of the battery is prolonged; and the density is small and the weight is light.

The invention belongs to the technical field of fiber metal laminates, and particularly discloses an anti-shearing fiber metal laminate and a preparation method thereof. A stainless steel ultra-thin belt, carbon fiber woven cloth and one-way carbon fiber prepreg are laid according to a laying scheme of [W / [G / 0 / G / 90] 2 / Gc] s, modified epoxy resin is coated between every two layers in the laying process, and the anti-shearing fiber metal laminate is obtained after curing; wherein W represents the carbon fiber woven cloth, G represents the stainless steel ultra-thin strip, 0 represents the unidirectional carbon fiber prepreg laid at 0 degree, 90 represents the unidirectional carbon fiber prepreg laid at 90 degrees, Gc represents the central layer, s represents the symmetrical laying layers along the central layer, and 2 represents the repetition frequency of [G / 0 / G / 90]. According to the prepared anti-shearing fiber metal laminate, the anti-shearing performance of the fiber metal laminate is greatly improved, and the possibility of damage such as layering damage, matrix fracture, fiber fracture and metal plastic deformation is reduced.

The invention belongs to the field of computer aided design, and discloses a design method of a multistable metamaterial with an ideal energy absorption characteristic, which comprises the following steps of: firstly, carrying out theoretical analysis on a buckle to establish a mathematical model; then, according to the theoretical solution of the rigidity value of the buckle structure, reverse topological optimization design is carried out on the curved beam, so that a force displacement curve of the curved beam has negative rigidity and peak force corresponding to the buckle. The buckle structure and the optimized and customized curved beam are assembled through the functional part, and the multistable metamaterial unit cell with the ideal energy absorption characteristic can be obtained. And programming design is carried out on the unit cells, so that the required metamaterial can be constructed to meet the energy absorption requirement under the complex load. The technical scheme is widely applicable to the fields of aerospace, automobile industry, building protection and the like, and excessive rebound of impact energy is avoided while the impact resistance of equipment is improved.

The present invention relates to a double anti-collision safety type automobile anti-collision beam structure, and relates to the technical field of automobile safety; it comprises two parallel distributed main anti-collision beams and a secondary anti-collision beam, both sides of the secondary anti-collision beam are provided with an integrated welded connecting beam, the outside of the connecting beam is provided with an energy absorption box, and the two ends of the main anti-collision beam are slidably arranged on the inner wall of the connecting beam; the ends of the two connecting beams away from the secondary anti-collision beam are integrated with the secondary side beams, and the secondary side beams and the secondary anti-collision beams are on the same arc line; the ends of the two connecting beams away from the main anti-collision beams are provided with main side beams, and the main side beams and the main anti-collision beams are on the same arc line; the present invention improves the safety performance of the automobile through the double anti-collision structure of the main anti-collision beam and the secondary anti-collision beam, and the main anti-collision beam can be buffered and expanded within a certain range, which greatly reduces the impact force when the automobile collides, and ensures the stability of the main anti-collision beam.

The invention discloses a multi-cell energy-absorbing thin-walled tube based on a paper folding structure, which belongs to the technical field of structural mechanics and comprises a thin-walled inner tube, a thin-walled outer tube and a plurality of rib plates. Each layer of unit cell structure is defined by n unit wall plates in an end-to-end connection mode, each unit wall plate comprises an upper trapezoidal unit plate and a lower trapezoidal unit plate which are connected along a first crease, and the left side and the right side of each upper trapezoidal unit plate are connected with upper triangular unit plates along second creases correspondingly. The left side and the right side of the lower trapezoidal unit plate are respectively connected with the lower triangular unit plate along a third crease, and the upper triangular unit plate and the lower triangular unit plate are connected through a fourth crease. According to the multi-cell energy absorption thin-walled tube based on the paper folding structure, the thin-walled inner tube and the thin-walled outer tube which are of the paper folding structure are compounded through the rib plates, higher average crushing force is obtained through the compound design, and therefore the load stability of the structure is improved; the deformation process of the multi-cell energy-absorbing thin-walled tube is stable and controllable through specific crease lines and geometric shape design.

The invention belongs to the field of material science and metamaterials, and particularly relates to an internal stress self-loading two-rod two-cable tension characteristic negative poisson ratio metamaterial structure which comprises an internal stress self-loading two-rod two-cable tension metamaterial cell element structure and a rotating hinge. The two-rod and two-cable tensioning metamaterial cell element structure capable of automatically loading the internal stress comprises a rigid shell part, a T-shaped rod piece, a pressed elastic assembly, a tensioned elastic assembly and a hydrogel driving assembly. The characteristics of self-stabilization, self-recovery, self-adjustment and the like of the overall tensioning structure are combined, the unique deformation mechanism of the negative Poisson's ratio material is reserved, the local stress concentration effect of a traditional material is overcome, the limitation that the tensioning structure depends on external loading internal stress is broken through, the energy absorption, shock absorption, impact resistance and other performance of the negative Poisson's ratio material are improved, and the tensile strength of the negative Poisson's ratio material is improved. The method is expected to be developed vigorously and can realize application value in multiple fields.

The present invention discloses a novel sandwich structure automobile front anti-collision beam and assembly, the anti-collision beam comprises a tubular aluminum alloy shell, the shell is provided with aluminum foam, two-layer lattice structure and honeycomb structure inside, the honeycomb structure is filled between the two-layer lattice structure, the two-layer lattice structure comprises a first lattice structure arranged on a side away from the automobile, the first lattice structure comprises a plurality of interconnected first unit cells in the shape of a structure, and the aluminum foam is filled in the gap between the two-layer lattice structure and the inner wall of the shell. The present invention has the advantages of absorbing impact energy, reducing impact peak force and being conducive to achieving lightweight of automobiles.

The invention provides a shell-based mechanical metamaterial design strategy based on level set function weighted combination. The framework is inspired by a three-period minimal curved surface, and a shell-based mechanical metamaterial database is constructed by adopting a level set function weighted combination strategy. The effective elastic performance of the metamaterial is evaluated through the homogenization theory of voxel modeling. A back propagation neural network model is developed, and the model can realize reverse mapping between geometric parameters and material attributes of a shell base unit. In addition, the reliability of the homogenization theory is verified by adopting a quasi-static compression test, and the effective elastic characteristic and the compression response of the shell-based structure are evaluated. Research results show that the shell-based mechanical metamaterial not only shows isotropic elasticity and high rigidity exceeding the upper limit of the Hashin-Shtrikman theory, but also has significantly improved yield strength and energy absorption ability under compression. According to the design, a series of light-weight and high-rigidity-strength structures are finally formed, and 3D printing forming is conducted through the PolyJet technology.

The utility model belongs to the technical field of wall structures, and particularly relates to an anti-explosion vibration-reduction energy-absorption wall structure which comprises a base layer wall board body, and a reinforcing assembly is arranged on the surface of the base layer wall board body. During use, the prefabricated concrete layers are poured between the two base layer wallboard bodies, the elastic steel plate is arranged between the prefabricated concrete layers, the energy absorption effect of the wall is improved, the multiple protruding blocks are installed on the surface of the elastic steel plate, gaps are reserved between the poured prefabricated concrete layers, and therefore the elastic steel plate can be used for reinforcing the prefabricated concrete layers. A viscoelastic damping material is poured between the two pouring prefabricated concrete layers, the anti-seismic and vibration-reducing performance of the wall is improved, a concrete prefabricated block is installed in an installation frame in cooperation with an installation assembly, a clamping block is installed on the surface of the installation frame, and a clamping groove is formed in the other side of the installation frame; the clamping blocks on one mounting frame are clamped into the clamping grooves formed in the surface of the other mounting frame, the two mounting frames are fixed through the fixing bolts b, wall splicing is facilitated, and mounting is convenient.

The invention belongs to the technical field of armor protection, and particularly relates to an anti-penetration bionic spiral laminated backboard packaging ceramic composite structure. According to the composite structure, the metal frame strongly restrains ceramic, so that the erosion efficiency of a ceramic material to a projectile is improved, meanwhile, the damage range under single impact is reduced through packaging, and therefore the multiple-impact-resistant capacity of the protective structure is improved. And the spiral laminated backboard on the lower surface of the ceramic is mainly used for providing back support for the ceramic material, so that the crushing of the ceramic material is delayed, and the penetration resistance of the ceramic is improved. The high-molecular polymer material back plate of the composite protection structure absorbs energy of shots and broken ceramic fragments through large deformation by means of the high tensile strength of the high-molecular polymer material back plate, and therefore the protection structure is prevented from being subjected to aftereffect damage after penetration of the shots. In addition, the overall thickness and the surface density of the composite protection structure are low.

The invention relates to a composite material / metal combined type automobile door anti-collision beam structure with an energy absorption box and preparation, and belongs to the technical field of automobile parts, the composite material / metal combined type automobile door anti-collision beam structure comprises a metal anti-collision beam main body, the metal energy absorption box, a double-concave outer arch type thermal forming stamping metal plate and a double-concave outer arch type carbon fiber composite material plate. The cross section of the metal anti-collision beam main body is shaped like a Chinese character'ri ', and a metal foam material foamed aluminum is added in a gap part of the shape like the Chinese character'ri' to serve as an energy absorption core material; the metal anti-collision beam body, the metal energy absorption box and the double-concave outer arch type thermal forming stamping metal plate are fixedly connected in a bolt connection mode. The double-concave outer arch type carbon fiber composite material plate is designed in a variable-angle and variable-thickness layering mode. The automobile door anti-collision beam has good corrosion resistance and excellent mechanical property, the strength of the automobile door structure is improved, and meanwhile the requirements of the current market for automobile light weight, energy conservation and emission reduction are met.

The invention relates to the technical field of battery packs, and discloses a bottom protection structure for a battery pack and the battery pack, the bottom protection structure for the battery pack comprises a liquid cooling plate, a bottom protection plate and a buffer layer; the bottom of the liquid cooling plate comprises a non-flow channel area and a protruding flow channel area; the bottom protection plate is arranged at the bottom of the liquid cooling plate, and the bottom protection plate and the liquid cooling plate are arranged at intervals; the buffer layer is arranged between the liquid cooling plate and the bottom protection plate, and the bottom of the buffer layer abuts against the bottom protection plate; in the flow channel area, the top of the buffer layer abuts against the liquid cooling plate; according to the present invention, the impact force can be effectively absorbed and dispersed when the different regions of the battery pack are impacted so as to ensure that the battery cells in the battery pack are not extruded when the battery pack is subjected to the external force effect, such that the battery pack can be prevented from being damaged, and the battery pack is prevented from being damaged. And the protection level of the battery cells in the battery pack is improved, and the overall safety of the battery pack is ensured.

The invention provides an anti-collision cross beam assembly of a vehicle forecabin, a vehicle body assembly of a vehicle and the vehicle. The anti-collision cross beam assembly of the vehicle forecabin comprises a first anti-collision cross beam, a first energy absorption box, a second anti-collision cross beam and a second energy absorption box. The first anti-collision cross beam is located above the second anti-collision cross beam in the height direction of the vehicle, the first anti-collision cross beam is located on the front side of a vehicle body longitudinal beam of the vehicle in the length direction of the vehicle, and the first energy absorption box is used for being connected between the first anti-collision cross beam and the vehicle body longitudinal beam; the second anti-collision beam and the second energy absorption box are both located on the front side of an auxiliary frame assembly of the vehicle in the length direction of the vehicle, the second anti-collision beam and the second energy absorption box are arranged in a staggered mode in the height direction of the vehicle, and the second anti-collision beam is connected with one end of the second energy absorption box through an anti-collision supporting piece. And the other end of the second energy absorption box is used for being connected with an auxiliary frame assembly, so that the collision force absorption effect of the anti-collision beam assembly is improved.

The invention discloses a high-toughness carbon-glass super-hybrid composite material as well as a preparation method and application thereof. Carbon fiber broadened filaments and glass fiber broadened filaments prepared by ultrathin carbon fiber spreading equipment are subjected to super-hybrid doubling, and the carbon-glass super-hybrid composite material with better reinforcing and toughening effects is prepared through a vacuum-assisted resin transfer molding process. An existing mixing method is improved, the problems that an interlayer mixing method is poor in mixing designability, low in fiber mixing degree, poor in toughening effect and the like are solved, the prepared carbon-glass super-mixed composite material has better reinforcing and toughening effects, and under the same carbon-glass volume ratio, the carbon-glass super-mixed composite material has the better reinforcing and toughening effects. The carbon-glass super-hybrid composite material is higher in tensile modulus, elongation at break and loss factor, and a drop hammer impact test shows that the carbon-glass super-hybrid composite material has the characteristics of larger energy absorption, small damage area and the like. In conclusion, the carbon-glass super-hybrid composite material shows better reinforcing and toughening effects, the mechanical property of the composite material is improved, and the carbon-glass super-hybrid composite material is better than an interlayer hybrid composite material on the whole.

The invention discloses a high-toughness zinc alloy with a prefabricated quasi-microcrack petal-shaped toughness second phase and a preparation method and application of the high-toughness zinc alloy, and belongs to the technical field of zinc alloy material processing. The microstructure of the high-toughness zinc alloy comprises a prefabricated quasi-microcrack petal-shaped GdZn12 phase or NdZn11 second phase or a mixture of the two second phases, wherein the volume fraction of the prefabricated quasi-microcrack petal-shaped GdZn12 phase or NdZn11 second phase is 3-10%, the average size distribution of the prefabricated quasi-microcrack petal-shaped NdZn12 phase or NdZn11 second phase is 5-40 microns, and the average grain size of matrix grains in the alloy is 0.5-1.2 microns. The degradable zinc alloy has high strength and high toughness at the same time, by means of the good toughness and deformation coordination capacity of the petal-shaped second phase, cracks can be prevented from being generated from the interface of the second phase and a matrix, meanwhile, the petal-shaped second phase can improve the energy absorption capacity through the cracks generated by the petal-shaped second phase, and in other words, the obdurability of the zinc alloy is improved.

The invention relates to a doorsill assembly, a vehicle body structure and a vehicle. The doorsill assembly comprises a doorsill inner plate, a doorsill outer plate and a reinforcing plate. The threshold inner plate and the threshold outer plate are connected and define an energy absorption cavity. The reinforcing plate is arranged in the energy absorption cavity, and the two opposite sides of the reinforcing plate are connected with the threshold inner plate and the threshold outer plate correspondingly. A connecting support is arranged at the bottom of the reinforcing plate and connected with the doorsill outer plate. The two opposite sides of the reinforcing plate are connected with the doorsill inner plate and the doorsill outer plate correspondingly, meanwhile, the bottom of the reinforcing plate is provided with a connecting support connected with the doorsill outer plate, at least three connecting and fixing points are arranged between the reinforcing plate and the doorsill outer plate and between the reinforcing plate and the doorsill inner plate, the position of the reinforcing plate in the energy absorption cavity is more reliable, the reinforcing plate is prevented from turning over, and the service life of the doorsill is prolonged. Therefore, collision energy can be transmitted to the reinforcing plate from the doorsill outer plate and then transmitted to the doorsill inner plate, so that the energy absorption effect of the doorsill assembly is improved, the collision intrusion amount is reduced, and the safety performance of the vehicle can be improved.

The utility model belongs to the technical field of photovoltaic panels, in particular to a photovoltaic panel mounting mechanism at the top of an industrial factory building, which comprises a mounting frame and an angle adjusting assembly mounted on the surface of the mounting frame, the angle adjusting assembly comprises two fixing rods hinged in a groove formed in the top surface of the mounting frame, and according to the gradient of the roof of the industrial factory building, the angle adjusting assembly can adjust the angle of the photovoltaic panel according to the gradient of the roof of the industrial factory building. A screw rod is rotated to drive a push block to slide in a support plate, a support rod is pushed through the push block, one end of the support rod jacks up a fixed rod, the two fixed rods drive one fixed plate at the same time, then a photovoltaic panel is placed on the fixed plate, and the other end of the photovoltaic panel is inserted into a fixed frame of a U-shaped structure on the top surface of a mounting frame. Meanwhile, bolts on the pressing plates are rotated, the pressing plates of T-shaped structures can be pressed on the photovoltaic panels through the bolts, the photovoltaic panels are fixed, the angles of the photovoltaic panels can be changed, adjustment can be conducted according to the gradient of the roof of the industrial factory building, the sunlight irradiation range is widened, and the energy absorption effect of the photovoltaic panels can be improved.

According to the cushion applied to the child safety seat and the child safety seat, the cushion is detachably laid on the child safety seat, the through hole is formed in the middle of the cushion so that a front striding belt can penetrate through the through hole to be connected in a restrained mode, and the seat part is divided into the hip supporting area and the thigh supporting area with the through hole as a reference. At least the thigh supporting area is filled with an energy absorption material with a slow rebound characteristic; under the condition that a vehicle collides or drastically slows down, the action time of elastic compression deformation of a child passenger on the thigh supporting area is effectively prolonged, the thigh supporting area reduces the resultant acceleration and displacement of corresponding parts of the body of the child passenger through a certain counter-acting force, and the real energy absorption effect is achieved; it is ensured that the injury index of the child passenger is optimized, the injury risk of the child passenger is reduced, and the riding safety and reliability of the child passenger are improved; meanwhile, the thigh supporting area is filled with the energy absorption material with the slow rebound characteristic, and the comfort of the child passengers is further improved.

The utility model discloses a road and bridge anti-collision pier, and relates to the technical field of anti-collision piers. Comprising anti-collision frames, the number of the anti-collision frames is at least two, the two anti-collision frames are fixed, a plurality of inner frames are installed in the anti-collision frames, a plurality of anti-collision plates are further fixed outside the anti-collision frames, each anti-collision frame comprises a patch and an outer blocking piece, and the patch and the two ends of the outer blocking piece are fixed through connecting plates. The surface of the patch is arc-shaped and is attached to the surface of the road pier. Through the arrangement of the anti-collision frame, the inner frame, the anti-collision plate and the like, compared with a traditional construction method, installation of the anti-collision pier is simpler, after the anti-collision frame is installed and fixed through the screw rods, reinforced concrete is poured into the inner frame, a formwork does not need to be erected and then disassembled, and the construction cost is reduced. In addition, the anti-collision pier has good energy absorption and buffering effects, and compared with a traditional anti-collision pier, the anti-collision pier has a good protection effect on the vehicle.

The invention relates to the technical field of detection equipment, in particular to an automobile anti-impact bumper performance detection device which comprises a base station, a pushing unit, two fixing frames, two pressure gauges and a center control box, the base station mainly plays a supporting role, and the pushing unit, the fixing frames, the pressure gauges and the center control box are all arranged on the base station. An impact block is arranged at the output end of the pushing unit, the pushing unit is used for pushing the impact block to move and impacting the bumper, and a range finder used for measuring the moving position of the impact block is arranged on the pushing unit; in the impact resistance detection process of the bumper, impact deformation detection, deformation time detection and impact force detection are carried out on the bumper, and the impact resistance detection of the bumper based on pedestrian protection work can be realized, so that the bumper can achieve the purpose of better protecting pedestrians; and the detection comprehensiveness and accuracy can be improved.

The utility model belongs to the technical field of absorption rods, and particularly relates to a Hopkinson pressure bar absorption rod which comprises a first rod used for being connected with a main rod of a Hopkinson pressure bar. The first bulge is fixed with the edge of the first rod; the second rod is used for being connected with the first rod, a circular groove is formed in the second rod, and a part of the first rod and the first protrusion are arranged in the circular groove. The spring in the pre-compression state is arranged in the circular groove of the second rod, so that the rigidity of the spring is increased, the energy absorption range is widened, meanwhile, certain thrust is applied to the first rod, and the energy absorption effect is improved. When the impact force is smaller than the thrust, the first rods are kept relatively static, when the impact force is larger than the thrust, the first rods extrude the elastic pieces, the elastic pieces reduce reflected waves by absorbing part of impact energy, and therefore the energy absorption efficiency is improved, and the shock wave absorption capacity of the absorption rods is improved.

The invention discloses ZnO-based voltage-sensitive semiconductor ceramic as well as a preparation method and application thereof, and belongs to the technical field of semiconductor ceramic. The ZnO-based voltage-sensitive semiconductor ceramic provided by the invention is prepared from the following components: ZnO, Bi2O3, MnO2, Co3O4, Cr2O3, Sb2O3, Al (NO3) 3, a disulfide bond organic silicon cross-linking agent, a photothermal conversion agent, a photoinitiator, a dispersing agent and a solvent I. The ZnO-based voltage-sensitive semiconductor ceramic has the characteristics of continuous thickness and uniform components, the voltage gradient and the nonlinear coefficient of the ZnO-based voltage-sensitive semiconductor ceramic are superior to those of a traditional product, the parameter drift rate after surge impact is small, and the ZnO-based voltage-sensitive semiconductor ceramic can be applied to high-end application scenes such as vehicle-mounted chargers of new energy automobiles.

The present invention relates to the field of solar energy fixing, and in particular to a solar energy fixing device for air-film buildings used for photovoltaic power generation. It comprises an auxiliary fixing component, and a convenient disassembly component is installed on one side wall of the auxiliary fixing component; the present invention starts a second motor to drive two groups of clamping blocks to fix the solar energy, thereby improving the limiting stability of the fixing device and the convenient disassembly effect; drives the temperature sensor to perform heat detection with one group of solar photovoltaic panel bodies in turn, and when it is found that the surface temperature of the solar photovoltaic panel body is lower than the surface temperature of the surrounding solar photovoltaic panel bodies, starts a fourth electric push rod to push the contact piece path detection structure to detect the circuit source of the solar photovoltaic panel body, thereby reducing the detection labor intensity and improving the protection detection accuracy of the fixing device, improving the fixing effect and improving the photovoltaic power generation effect of the device.

The damping and buffering connecting mechanism comprises a switching assembly and a damping assembly, the switching assembly is arranged at the top end of a machine gun frame, the top of the switching assembly is connected with the damping assembly, and the top of the damping assembly is connected with the infrared sighting telescope; the adapter assembly comprises an adapter base, the adapter base is connected with an energy absorption adapter plate, and the energy absorption adapter plate is connected with a Picatinny guide rail piece; the damping assembly comprises a locking base and a locking bolt, the half side of the locking bolt is tightly embedded into the locking base, and the other half side of the locking bolt is tightly embedded into a transverse groove of the picatinny guide rail piece. The locking seat is connected with a connecting frame, and a damping shock absorber and a damping spring are arranged between the connecting frame and the connecting seat. According to the scheme, the shock absorption device has the beneficial effects that the structure is simple, the design is reasonable, and the shock absorption assembly is adopted to effectively protect the infrared sighting telescope, so that the shock absorption device adapts to the impact force of various machine guns with small and medium diameters, the use reliability of the infrared sighting telescope is improved, and the tactical application performance of the machine guns is powerfully ensured.

The invention discloses a method for optimizing parameters of a mixed lattice structure, which comprises the following steps of: taking a unit cell type, porosity and relative volume in the mixed lattice structure as design variables, introducing structural strength and rigidity as constraint conditions, and performing finite element modeling on the mixed lattice structure by taking maximization of energy absorption capacity as a target; on the basis of the built mixed lattice structure model, grids at the joints of the mixed lattice structure are locally encrypted; building an automatic simulation analysis process system; a firefly population is initialized based on different structure parameters, models of different structures are imported into finite element simulation software based on an established simulation analysis system to analyze the mechanical properties of the models, and the optimal solution is searched in the solution space by calculating the mechanical parameters of the mixed lattice structure, evaluating the corresponding fitness of the mixed lattice structure and updating the position and brightness of the firefly. The parameter optimization model of the mixed lattice structure is used for optimizing the mixed lattice structure, and the energy absorption capacity of the structure can be effectively improved.

The invention belongs to the technical field of radio frequency coaxial connectors, and particularly discloses an elastic connecting piece of a radio frequency coaxial connector and a connector with the elastic connecting piece, the elastic connecting piece comprises a tubular body, a plurality of through grooves are formed in one end of the tubular body in the axial direction, and the end where the through grooves are located is divided into a plurality of deformation units through the through grooves; the adjacent deformation units can be close to or far away from each other under the action of radial external force; first corrugated folds are arranged on the tubular body in the circumferential direction away from the deformation unit, or a corrugated fold ring is coaxially arranged at the end, away from the deformation unit, of the tubular body, and the first corrugated folds and the corrugated fold ring can deform and stretch out and draw back in the axial direction under the action of external force. Through the design of the invention, the service life of the elastic connecting piece can be prolonged, and the connection reliability of the radio frequency coaxial connector is improved.

The utility model provides a kind of ECC bridge crash barrier belongs to ECC bridge field, including frame, energy-absorbing installation component being arranged in the inside of frame and support fixed component being arranged on the surface of frame, energy-absorbing installation component includes the vertical barrel being arranged in the inside of frame, vertical barrel is internally provided with inner chamber, detachably connected with water storage bucket in inner chamber, internally fixedly connected with fixed column, energy-absorbing is carried out by vertical barrel, support fixed component includes the support rod of detachably connected in one side of the surface of frame, the utility model frame inside both ends are equipped with connecting seat, connecting seat is attached to the inside surface of frame, wherein connecting seat surface is all provided with connecting hole, fixed column surface is equipped with vertical barrel, vertical barrel is installed to water storage bucket by the inner chamber being internally provided, water storage is carried out by water storage bucket, energy-absorbing work is carried out when collision occurs, increase the anti-collision property of whole, and then ECC bridge crash barrier is used, and the energy-absorbing property of whole is higher.

The utility model discloses a permanent and temporary combined steel cofferdam suitable for a shallow water tidal zone, which comprises a bearing platform pile foundation (1), a protection structure (2) is arranged on the outer side of the bearing platform pile foundation (1), the protection structure (2) comprises a steel pipe pile (21) arranged on the outer side of the bearing platform pile foundation (1), a lock catch (22) is arranged on the side edge of the steel pipe pile (21), a buckle block (23) matched with the lock catch (22) is arranged on the other side of the steel pipe pile (21), and the buckle block (23) is connected with the bearing platform pile foundation (1). The bearing platform pile foundation (1) is surrounded by the connected steel pipe piles (21), and the outer side of each steel pipe pile (21) comprises the side shell (3), so that the water surrounding problem of construction of the bearing platform pile foundation (1) can be effectively solved, the structure is simple, construction is convenient, large equipment and equipment are not needed, the influence on a channel is small, the construction cost can be effectively reduced, and the construction efficiency is improved. And energy dissipation schemes are designed on the inner sides and the outer sides of the steel pipe piles (21), so that good collision prevention and energy absorption capacities are achieved, and ships and bridge piers and abutments are protected.