97 results about "Impact energy absorption" patented technology

The invention belongs to the field of material surface treatment, and relates to a glass explosion-proof rubber coating process. According to the process, alpha-Al2O3 nanoparticles and fatty acid grafted modified nano SiO2 are prepared, a nano composite adhesive containing aramid fibers and nickel hydroxyl iron powder is prepared in combination with a three-stage dispersion process (mechanical shearing, ultrasonic cavitation and rolling grinding), and a glass surface nano rough interface is constructed in combination with plasma treatment and a PECVD (Plasma Enhanced Chemical Vapor Deposition) technology. A magnetoelectric synergistic coating (magnetic field orientation + vacuum infiltration + gradient pressure + electrostatic overlock) and electromagnetic curing-gradient cooling process is adopted to realize uniform coating and rapid crosslinking of an adhesive layer. Through cooperation of material modification and a multi-field coupling process, the impact energy absorption of an adhesive layer is greater than or equal to 80%, the interface bonding strength reaches 22MPa, the curing time is shortened by 50%, degumming is avoided in an extreme environment, and the thickness deviation of the adhesive layer is + / -5 [mu] m. By adopting natural raw materials and a low-VOC formula, the anti-explosion glass is suitable for scenes such as building curtain walls and automobile glass, the anti-explosion performance is improved, and the service life is prolonged.

The subject of the invention is an impact energy absorbing device, comprising a shock absorber (3) with a cylinder (3a) and piston rod (3b), a sleeve (1) to be cut and a machining tool (2) surrounding the sleeve (1) to be cut, for machining the surface of the sleeve (1) to be cut, characterized in that the sleeve (1) to be cut is a cylinder (3 a) of the shock absorber (3).

The invention discloses a liquid cooling plate and a battery pack, and aims to solve the problems of insufficient structural strength, weak bottom protection, low thermal management efficiency, unreliable sealing, high cost and the like of the existing liquid cooling plate. The liquid cooling plate comprises an upper-layer aluminum plate used for being in contact with a battery cell group for heat conduction; the bottom surface of the inner side of the lower-layer box-shaped steel plate is fixedly connected with the upper-layer aluminum plate, a concave-convex structure is arranged on one surface, facing the upper-layer aluminum plate, of the lower-layer box-shaped steel plate, and the concave-convex structure is matched with the bottom surface of the upper-layer aluminum plate to form a closed cooling flow channel; and the bottom foamed aluminum is fixedly connected to the bottom surface of the outer side of the lower-layer box-shaped steel plate and is preferably provided with a profiling structure corresponding to the bottom of the lower-layer box-shaped steel plate. The battery pack provided by the invention adopts the liquid cooling plate, and the lower box-shaped steel plate of the liquid cooling plate is connected with the steel rolling battery frame body and forms reliable sealing with the upper cover of the battery pack through the bolt, the rivet nut and the sealing gasket. Through the three-layer composite structure design, the effects of high structural strength, excellent bottom impact energy absorption protection (an independent bottom protection plate can be omitted), efficient and uniform heat management, reliable sealing and simplified integration are achieved, and the overall performance, safety and economical efficiency of the battery pack are improved.

The invention discloses high-performance brittle-crack-resistant steel for nuclear power pressure-bearing equipment and a manufacturing method of the high-performance brittle-crack-resistant steel. The high-performance brittle-crack-resistant steel comprises the following chemical components: 0.16%-0.24% of C, 0.20%-0.40% of Si, 1.25%-1.60% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.25%-0.45% of Cr, 0.25%-0.40% of Cu, 0.30%-0.50% of Ni, 0.005%-0.008% of Ca, 0.65%-1.25% of Mo and 0.04%-0.08% of V. The manufacturing method comprises the steps of smelting, continuous casting, heating rolling and heat treatment. The thickness of the steel plate is 30-120 mm, and through hardening and tempering and simulated postweld heat treatment, the normal-temperature tensile yield strength is larger than or equal to 620 MPa, the tensile strength is larger than or equal to 770 MPa, the 360-DEG C high-temperature tensile yield strength is larger than or equal to 518 MPa, the tensile strength is larger than or equal to 618 MPa, the impact absorption energy at the temperature of-40 DEG C is 195 J or above, the non-ductility transition temperature is smaller than or equal to-52 DEG C, and the grain size is larger than or equal to 8.5 grades. The steel provided by the invention has good mechanical properties and brittle crack resistance, and fully meets the requirements of steel for pressure-bearing equipment of a nuclear power unit.

According to the anti-collision beam for power battery protection and the installation position determining method, an aluminum alloy irregular cavity anti-collision beam structure is adopted, a multi-stage energy absorption channel formed by connecting multiple cavities and inner ribs is utilized, and efficient impact energy absorption under the light weight condition is achieved; meanwhile, the optimal arrangement distance between the anti-collision beam and the front wall of the battery pack is determined through simulation analysis, so that the anti-collision beam collapses and absorbs energy step by step in the collision process, impact energy is dissipated step by step through a shell of the battery pack, the maximum deformation quantity of a battery cell is remarkably reduced, and the impact-resistant safety performance of a battery system and the protection reliability of the whole vehicle are improved.

The invention provides a textile composite material impact energy absorption simulation method, system and device and a medium, and the method comprises the steps: carrying out the connected domain analysis of a tomography image, and determining the equivalent diameter distribution characteristics of pore defects in a textile composite material; performing stochastic simulation based on the equivalent diameter distribution characteristics in combination with a mesoscopic geometric model of the textile composite material to obtain stochastic pore space distribution of the textile composite material in the resin enrichment area; geometric difference is carried out on the random pore space distribution and the mesoscopic geometric model, and then a mesoscopic finite element model containing pore defects is constructed; and endowing the mesoscopic finite element model with material attributes and carrying out explicit kinetic analysis on impact load, and further determining the impact energy absorption performance of the textile composite material prepared in the batch according to an analysis result. By adopting the scheme of the invention, systematic deviation of impact energy absorption performance prediction caused by model idealization can be reduced.

The present application relates to an aircraft seat impact energy absorption protection bracket assembly and an aircraft seat. The aircraft seat impact energy absorption protection bracket assembly comprises a limiting pin accommodating hole, a chair tubular accommodating part, a gas compression cavity, a one-way gas flow channel, an outer cavity, a sliding block, a roller, and an elastic member. The limiting pin accommodating hole is used for accommodating a limiting pin, and the chair tubular accommodating part is used for accommodating a chair tubular. The aircraft seat impact energy absorption protection bracket assembly is connected with a backrest structure through the limiting pin and connected with a seat plate through the chair tubular. The one-way gas flow channel connects the gas compression cavity and the outer cavity. The sliding block is at least partially accommodated in the gas compression cavity and one end of the sliding block is in contact with the chair tubular. The roller is supported by the elastic member and abuts against a side surface of the sliding block to form a lock. When an acting force of the chair tubular on the sliding block exceeds a lock threshold, the sliding block pushes away the roller and slides in the gas compression cavity, compresses the gas in the gas compression cavity, and then the compressed gas is released to the outer cavity through the one-way gas flow channel.

To provide an impact energy absorption structure member having excellent impact energy absorption performance relative to an oblique impact.SOLUTION: An impact energy absorption structure member includes an aluminum extrusion material and has a shape in which an extrusion material cross section with a specific shape extends in an extrusion direction that is a vertical direction to the extrusion material cross section. The extrusion material cross section includes a shape in which two or more sections surrounded by a wall part comprising the aluminum extrusion material are aligned adjacent to each other in one direction. In an impact test, before a section 1 that receives an impact first is crushed completely, a boundary of a section 2 that receives the impact secondarily with the section 1 is deformed in an inner direction of the section 2, and a wall part that does not come into contact with a section other than the section 2 is deformed in an outer direction of the section 2 on the extrusion material cross section.SELECTED DRAWING: Figure 1

The application discloses a bionic variable stiffness interlocking structure suitable for a planetary lander and a preparation method, and relates to the technical field of deep space exploration. The bionic variable stiffness interlocking structure of the application reserves a gap, an auxiliary rib or a cylinder as a weak end, the weak part is preferentially dissipated damage under load, and the overall secondary stiffness change is realized through truss fitting and locking and compression. The application adopts a partition functional arrangement, uses a martensite dominant nickel-titanium alloy lattice support in a landing impact energy absorption part, relies on martensite reorientation to realize efficient energy dissipation, low residual strain and shape recovery, uses an austenite dominant nickel-titanium alloy lattice support in a main load bearing core area, and uses the high modulus and buckling resistance characteristics to guarantee the structure stiffness and stability. Through the collaborative combination of the two types of alloy units, the load bearing, buffering and adaptive variable stiffness integration are realized, the planetary landing process multi-load coupling working condition requirements can be effectively met, and the structural reliability and buffering performance of the lander under deep space extreme environment are improved.

The present invention discloses a non-pneumatic tire and a multi-scale parallel topology optimization design method thereof, which relates to the field of wheel design technology. It solves technical problems existing in traditional single-scale tire topology optimization design methods, such as limited design space, high computational cost, and poor connectivity of connected structures. The key point of its technical solution is to map the tire annular design domain to a rectangular design domain through coordinate transformation, thereby reducing optimization costs. Multiple types of microstructures are introduced into the multi-scale optimization of the structure, and a multi-scale parallel topology optimization design model for the non-pneumatic tire structure is constructed based on the SIMP method and the energy homogenization method. This also effectively solves the topology optimization design problem of the mechanical properties of the continuum structure considering the non-design domain, and realizes the parallel topology optimization of the non-pneumatic tire macrostructure and microscopic unit cell configuration, so as to give full play to the advantages of the porous structure, so that the non-pneumatic tire has the characteristics of high specific stiffness, impact energy absorption, light weight, and designability.

The invention discloses a strain rate sensitive composite foam material and a preparation method thereof, and relates to the technical field of high polymer materials, and the preparation method comprises the following steps: mixing hydroxyl-terminated polydimethylsiloxane, thermoplastic polyurethane powder, a microsphere foaming agent, boric acid and a derivative thereof, and foaming in a temperature range of 65-120 DEG C to obtain the strain rate sensitive composite foam material, the mass ratio of the hydroxyl-terminated polydimethylsiloxane to the thermoplastic polyurethane powder is within the range of 1: (1-10); the addition amount of the microsphere foaming agent is 0.02-15wt% of the total mass of the foaming powder; the molar weight of the boric acid and the derivative thereof is 1-10 times of the molar weight of the hydroxyl-terminated polydimethylsiloxane; the strain rate sensitive composite foam material prepared by the invention has good size and structural stability, good strain rate effect and impact energy absorption effect, and the preparation method is simple.

The application discloses an insect exoskeleton morphological layup composite panel, a sandwich structure and a preparation method. The sandwich structure comprises two pieces of bionic layup composite panels and a piece of aramid honeycomb core layer. The bionic layup composite panel draws lessons from the spiral stacking microstructure of the insect exoskeleton, the layup design considers the symmetry and balance requirements of the composite material, a fixed rotation angle is introduced between adjacent fiber layers, and the rotation angle is taken as a period of 180 degrees, and after a plurality of periods are laid and heat-pressed and cured, the bionic layup composite panel is obtained. The bionic layup design effectively reduces the interlaminar shear stress of the composite material, weakens the inherent anisotropy of the composite material, and improves the transverse bearing capacity and impact resistance. The bionic layup composite panel and the aramid honeycomb core layer have the advantages of high specific strength, high specific stiffness, impact energy absorption, vibration and noise reduction, electromagnetic shielding and the like, and a structure and function integrated material with more excellent comprehensive performance is obtained, and the structure and function integrated material is expected to be widely used in main load-bearing structures of various spacecrafts.

The utility model provides a kind of Apli leg type impact energy-absorbing protective device for automobile pedestrian protection, including box, box inside hollow formation accommodating cavity, the side of box is equipped with the impact port that is communicated with accommodating cavity, the hook in accommodating cavity is set to the top of box, the side wall of box is set to first protective pad back to impact port, the bottom of box is set to second protective pad, the top of box is set to third protective pad. By setting box, the flight distance of Apli leg type after being impacted can be limited, which is limited in accommodating cavity, after the flight distance is reduced, the landing point deviation rate caused by flight angle is reduced, at the same time, by setting first protective pad on the side wall back to impact port, second protective pad and third protective pad are respectively set on the bottom and top of box, different angle protective measures can be formed in the direction away from impact port, after Apli leg type is impacted and flies, kinetic energy is absorbed, Apli leg type is protected from damage.

The application relates to the application field of metal powder metallurgy technology and discloses a copper-based composite material metal block capable of resisting impact energy and a preparation process and application thereof. The copper-based composite material metal block is used in impact and collision process tests, and impact energy absorption, reduction or elimination is realized by self-pulverization and disintegration. Raw materials of the copper-based composite material capable of resisting impact energy include, in percentage by mass, 1-95% of atomized copper powder, 0-95% of electrolytic copper powder, 1-15% of tin powder, 1-2% of molybdenum disulfide, 0-3% of graphite, 0-7% of phenolic resin, 0-1% of lithium stearate and 0-1% of magnesium stearate. The above raw materials are mixed, secondarily pressed, sintered and electroplated to form the copper-based composite material. When encountering an impacted metal barrier section, the metal block can absorb the counter-impact energy and disintegrate by itself, so that the running speed instantaneously drops to zero, the metal fragment splashing phenomenon does not occur, and the copper-based composite material does not contain lead metal, so that the whole impact and collision process is harmless to the surrounding environment.

The invention provides a method and a device for testing the buffer performance and energy absorption of a flexible film material, and the method comprises the following steps: measuring an initial speed V0, obtaining the change F (t) of force along with time by the product of the change of acceleration along with time measured in the step S8 and the mass of a small ball, and obtaining the change S (t) of displacement along with time by two-time integration, and the specific calculation formula is as follows: the maximum energy absorbed by a film is Emax = E (t), compared with the prior art, the method has the following beneficial effects: 1, a calculation model of the method for testing the buffer performance of the flexible thin film material is established, so that the buffer performance index is more scientific and accurate; 2, the device for testing the buffer performance and the energy absorption of the flexible thin film material studies the influence of the factors on the buffer performance and the energy absorption test result of the flexible thin film material; 3, the impact energy absorption performance of the film is evaluated, and a direct test feedback and comparison reference is provided for research and development of a formula, a structure and a process of the film with higher impact resistance.

The present disclosure provides novel microfiber and graphene reinforced polymer matrix composites and methods of forming them. The disclosed microfiber and graphene reinforced polymer matrix composites exhibit improved mechanical properties such as stiffness, tensile strength, and impact energy absorption.

This invention provides a highly versatile impact energy absorption mechanism that can absorb the impact energy of a colliding object regardless of its installation location. [Solution] The impact energy absorption mechanism consists of a collision receiving part 10, a disc 20, and a specific link mechanism 30. The collision receiving part 10 is movable with one degree of freedom in the collision direction of the colliding object 1. The disc 20 has a one-way clutch 21 and a handle connection point 22 for rotating the disc around a rotation axis. The specific link mechanism 30 is designed to prevent the impact on the colliding object 1 from being transmitted to the collision receiving part 10 during the collision and to prevent the impact on the colliding object 1 when it has finished stopping. One end of the specific link mechanism 30 is connected to the collision receiving part 10 so as to be axially rotatable on an axis perpendicular to the collision direction of the colliding object 1, and the other end is connected to the handle connection point 22 so as to be axially rotatable on an axis in the same direction as the rotation axis of the disc 20.

The invention provides a high collision energy absorption 550MPa grade zinc-based coated steel plate which comprises a base plate and a coating, the base plate comprises the following components in percentage by weight: 0.05%-0.09% of C, 0.15%-0.45% of Si, 1.20%-2.50% of Mn, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.03%-0.06% of Al, 0.02%-0.10% of Nb, 0.02%-0.10% of Ti, 0.15%-0.60% of Cr, and Fe and other inevitable impurities; and the plating layer comprises the following components in percentage by mass: 0.15%-3.50% of Al and the balance of Zn. The invention further provides a manufacturing method of the 550MPa-grade zinc-based coated steel plate with the high collision energy absorption. The manufacturing method comprises the steps of smelting, casting, hot rolling and hot dipping. The invention further discloses a hot stamping method of the 550MPa-grade zinc-based coated steel plate with the high collision energy absorption. The hot stamping method comprises the steps of steel plate heating, steel plate cooling and hot stamping. According to the hot stamping forming part produced through the method, the tensile strength is larger than 550 MPa, the yield strength is larger than 370 MPa, liquid-phase brittleness and liquid-phase cracks do not exist, and the hot stamping forming part has good obdurability, excellent corrosion resistance and high collision energy absorption performance.

The present invention relates to a thick steel plate for a container with high strength and low welding crack sensitivity. The chemical composition of the steel plate is as follows by mass percentage: C: 0.04%-0.06%, Si: 0.15%-0.30%, Mn: 1.60%-1.70%, P≤0.005%, S≤0.001%, Ni: 0.05%-0.13%, Cr: 0.20%-0.30%, Mo: 0.10%-0.20%, Nb: 0.01%-0.02%, V: 0.08%-0.15%, Al: 0.01%-0.02%, Cu≤0.02%, B≤0.003%, Zr: 0.003%-0.008%, V+Zr≤0.15%, and the balance is Fe and unavoidable impurities. The steel plate of the present invention has a yield strength of ≥700MPa; a tensile strength of 800-950MPa; an elongation of ≥19%; an impact energy absorption at -50°C of ≥100J; and a crack tip opening displacement CTOD value of δ R Between 0.800 and 0.820; the crack extension Δa is between 0.62 and 0.65, and the low welding crack sensitivity coefficient Pcm≤0.22.

A tire (1) is disclosed comprising a tread (20) and a belt portion (100) located radially below the tread (20). The tread (20) has two shoulder portions, each shoulder portion comprising a shoulder groove (21). The belt portion (100) comprises an intermediate belt (120) and a pair of working belts comprising a first working belt (110) and a second working belt (130) arranged radially above the first working belt (130). The intermediate belt (120) is arranged between the first working belt (110) and the second working belt (130) and has elongated reinforcement elements making an angle of less than 5° with a circumferential direction of the tire (1). The intermediate belt (120) comprises a first layer (121) and one or more further layers (122, 123). The first layer (121) of the intermediate belt (120) extends over at least 70% of the axial width of an axially largest working belt (110, 130) of the pair of working belts. Each layer of the one or more further layers (122, 123) of the intermediate belt (120) is arranged radially below one of the shoulder grooves (21) and extends over at most 50% of the axial width of the axially largest working belt (110, 130). The belt portion (100) further comprises a top belt (140) arranged radially above the second working belt (130). The top belt (140) comprises reinforcement cords having an impact energy absorption higher than 7 J / mm2.

The present invention discloses a highly elastic professional court structure, comprising a waterproof base layer, a first elastic layer, and a second elastic layer. The lower end surface of the first elastic layer is connected to the waterproof base layer, and the first and second elastic layers are connected via an adhesive layer. Foam balls are embedded within the first elastic layer, and a layer of red rubber particles is provided on the upper surface of the second elastic layer. The density of the second elastic layer is greater than that of the first elastic layer. The present invention provides an upper buffering bump on the lower surface of the second elastic layer and a lower buffering bump on the upper surface of the first elastic layer. The top corners of the lower buffering bumps correspond to inverted "V"-shaped grooves, which can enhance the connection strength between the first and second elastic layers. This structure, combined with the foam balls, significantly improves the court's compressive resistance and enhances its impact energy absorption.

The purpose of a side sill for a vehicle according to an embodiment of the present invention is to improve the impact energy absorption efficiency of the side sill and to achieve light-weight, and the side sill for the vehicle comprises: a side sill frame which extends in a first direction and has a hollow cavity part; and a reinforcement frame which is arranged in the hollow cavity part and includes a plurality of unit patterns extending in the first direction, wherein the unit patterns each comprise a plane portion arranged on a plane formed in the first direction and a second direction crossing the first direction, and an inclined portion connected to the plane portion and arranged to be inclined with respect to the plane portion, and at least one of the plane portion and the inclined portion includes a bent portion extending in the second direction.

This invention discloses an in-situ self-generated TiBw and TiCp synergistically reinforced bi-matrix heterostructure titanium matrix composite material prepared by powder metallurgy, and its preparation method. This invention aims to solve the problems of "strength-plasticity mismatch" and insufficient dynamic impact energy absorption efficiency in traditional titanium alloys and their composites. The composite material uses pure Ti as the soft phase, TC4 as the hard phase, and B4C particles as the reinforcing precursor. It can be formed by low-energy ball milling, vacuum drying, rapid hot pressing sintering, and heat treatment, without subsequent rolling or forging. B4C reacts in-situ with the matrix to generate TiBw (TiBw) and TiCp (TiCp), constructing a discontinuous in-situ self-generated bi-scale TiBw and TiCp synergistically reinforced heterostructure at the soft-hard phase interface, achieving a significant synergistic effect of strengthening and toughening. The prepared composite material has a quasi-static tensile strength of 1085 MPa and a fracture strain of 16.3%; at 3000 s⁻¹, the tensile strength is 1085 MPa. ‑1 The dynamic compressive strength under strain rate reaches 1562 MPa, with a true strain of 27.8% and an energy absorption efficiency of 408 MJ / m³. This composite material achieves synergistic optimization of high strength, high plasticity, and high energy absorption through mechanisms such as twinned coordinated plasticity, multi-stage whisker fracture energy dissipation, and adiabatic shear band suppression. The invention features a simple process and low cost, making it suitable for the fabrication of lightweight, high-impact-resistant structural components for aerospace, armor protection, and other applications.

The invention relates to a truck tire. A tire includes a tread, two working belts, and an intermediate belt disposed radially between the two working belts. In addition, the tire further comprises a top belt layer comprising reinforcing cords having an impact energy absorption rate higher than 7 J / mm2. In one aspect, the intermediate belt includes a first layer extending over at least 70% of an axial maximum working belt axial width, and one or more further layers underlying one or more shoulder grooves extending over at most 50% of the axial width. In another aspect, the intermediate belt layer comprises a metal cord having the structure a + b x d, where a is 1 to 5, b is 2 to 7, and d is 0.2 mm to 0.5 mm. In another aspect, the intermediate belt has a rubber permeability of at least 90% along at least 90% of its axial width.

To provide a laminated lithium ion secondary battery which is strong against impact from external force and has high reliability and high safety even if it has high capacity and high voltage.SOLUTION: The separator of the laminated lithium ion secondary battery includes a substrate and a heat-resistant coating layer formed on the substrate, wherein the separator has an impact energy absorbing capacity C of not less than 36.0 and not more than 55.0 in MD and TD, and a ratio (CMD / CTD) of a value CMD of the impact energy absorbing capacity C in MD to a value CTD in TD is not less than 0.80 and not more than 1.25. The impact energy absorbing capacity is an area value surrounded by a stress-strain curve and a horizontal axis from an origin to a breaking point in the stress-strain curve obtained by performing a tensile test under a condition of a tensile speed of 100mm / min using a test piece of test piece type 2 by a method in accordance with JISK7127 Plastics-Determination of tensile properties-Part 3: Test conditions for films and sheets.SELECTED DRAWING: Figure 2

The invention discloses a production method of a high-Ni ultrahigh-strength high-toughness steel plate. The steel comprises the following chemical components in percentage by mass: 0.03-0.05% of C, 0.10-0.35% of Si, 0.50-0.70% of Mn, less than or equal to 0.008% of P, less than or equal to 0.0053% of S, 8.6-9.0% of Ni and the balance of Fe and inevitable impurities. The steel plate is produced by adopting a continuous casting billet with the thickness of 180-220 mm, and the thickness of the steel plate is 10 In the casting process, 1-2 kg / min of iron powder is added into a crystallizer so as to control the lower superheat degree; a high-temperature short-time heating process is adopted for the blank, the heating temperature ranges from 1240 DEG C to 1260 DEG C, the heat preservation time ranges from 20 min to 40 min, and water cooling is conducted to the temperature below 350 DEG The heat treatment adopts a quenching, tempering and water cooling process, the quenching temperature is 780-820 DEG C, the tempering temperature is 580-620 DEG C, and water cooling is performed after tempering. According to the steel plate produced through the method, the tensile strength ranges from 760 MPa to 820 MPa, the yield strength ranges from 650 MPa to 690 MPa, and the impact absorption energy at the temperature of minus 196 DEG C is larger than or equal to 120 J.

The invention provides a cabin body buffer structure under gliding landing impact load, and belongs to the field of buffer structures, the cabin body buffer structure comprises a buffer part, a throwing cabin and an ultra-high molecular weight polyethylene plate, hard rubber is fixedly connected to four corners of the ultra-high molecular weight polyethylene plate, and a carbon fiber composite plate is fixedly connected to the outside of the hard rubber; a honeycomb aluminum structure layer is fixedly connected to the interior of the ultra-high molecular weight polyethylene plate and filled with high-density polyurethane foam, and a silicon rubber cushion is arranged on the inner side of the honeycomb aluminum structure layer. According to the invention, through the arrangement of the buffer component, by utilizing the combined design of hard rubber and carbon fiber composite boards, and honeycomb aluminum structural layers and high-density polyurethane foam, the structure and material combination accurately matches the stress characteristics according to the specific working condition of medium inclined falling of the heavy cabin, so that the buffer efficiency is improved; meanwhile, the graded buffer structure and the composite material have a synergistic effect, so that impact energy is fully absorbed, and the impact acceleration is stably controlled.

The invention discloses a steer-by-wire collapse compensation system and device, and the system comprises a position monitoring module which is configured to obtain a first position where a steering wheel slides in a first axis and a second position where the steering wheel rotates in a second axis in steer-by-wire, and merge the first position and the second position to obtain a position signal; the track determination module is configured to receive the position signal and determine the signal variation between the position signal at the current moment and the position signal at the previous moment; the crumple adjusting module is used for receiving the signal variable quantity and determining whether to adjust the crumple quantity of the steer-by-wire crumple compensation device or not according to the value of the signal variable quantity; if the signal variable quantity exceeds the preset variable quantity within the preset time threshold value, crumple adjustment is executed, and otherwise, the current crumple adjustment quantity is kept. According to the invention, through cooperation of passive and active crumple mechanisms, active compensation is carried out on spatial offset caused by different-plane axes, and stable and reliable impact energy absorption under all working conditions is realized.

A protective helmet and an associated impact protection layer are shown. The impact protection layer serves to improve the impact energy absorption of a rigid material within the helmet shell. The impact protection layer is connected to the helmet shell via a support positioned along the inner surface of the helmet. In various embodiments, the impact protection layer comprises a plurality of projections. In certain embodiments, the plurality of projections are conical.