818results about "Elastic dampers" patented technology

This invention relates to metamaterials for shock absorption and load bearing applications and to the methods for producing said metamaterials, wherein the essence of the metamaterial design lies in creating materials through artificially crafted structural units with specific properties and functions.

An additively manufactured cushion includes an array of interconnected surface lattice unit cells. The surface lattice unit cells are comprised of a unit cell surface portion configured as a Schoen F-RD minimal surface unit cell, and the unit cell surface portion is comprised of a rigid, flexible, or elastic polymer. In some embodiments, the surface lattice unit cells have an average width of from 1 to 100 millimeters and an average volume fraction of from 5 or 10 percent to 50 or 60 percent.

The invention relates to a shock-absorbing structure, in particular for a motor vehicle, having a main direction of shock absorption, and having at least one profiled member made of composite material containing reinforcing fibers, this profiled member having a substantially cylindrical shape having a straight-line generatrix, this straight-line generatrix being oriented in the main direction of shock absorption.

An automotive body side structure includes: a side sill extending in a vehicle length direction; a battery pack disposed vehicle inside in a vehicle width direction relative to the side sill; and a collision energy absorptive part having a substantially U-shaped cross section, the substantially U-shaped cross section including: a bottom portion substantially parallel to a vehicle height direction; and a pair of side wall portions continuous from an upper end and a lower end of the bottom portion. The collision energy absorptive part is provided in a protruding shape toward vehicle outside in the vehicle width direction on an outer peripheral side in the vehicle width direction of the battery pack facing the side sill. The collision energy absorptive part is made of a steel sheet having a tensile strength of 270 MPa-class to 340 MPa-class and a plate thickness of 1.0 mm to 1.4 mm.

The invention relates to a shock absorption structure (50), particularly for motor vehicles, having a principal direction (DP) of shock absorption, and comprising at least one profiled element (51) made of composite material containing reinforcing fibers, this profiled element having a substantially cylindrical shape having a generating line, this generating line being oriented along the principal direction of shock absorption.

The invention discloses a multi-density honeycomb core energy absorption structure and application thereof.The energy absorption structure is integrally formed by adjacently arranging a plurality of honeycomb cores, the aperture of each honeycomb core is gradually decreased from the center of the energy absorption structure to the periphery, and the arrangement density of the honeycomb cores is gradually increased from the center of the energy absorption structure to the periphery. The multi-density honeycomb core energy absorption structure is small in middle density and large in periphery density, has the advantages of being good in energy absorption curve stability, small in trigger impact force, stable in curve, high in bending strength and the like, and compared with existing products at present, the multi-density honeycomb core energy absorption structure can effectively improve the compressive strength of unit area. And meanwhile, the cross section density of the energy absorption structure can be changed and adjusted, the size can be customized, and the application range is wider.

The invention relates to the technical field of mechanical metamaterials, in particular to a negative Poisson's ratio cell element with an embedded symmetrical broken subcell structure, which comprises a concave hexagonal main body, the concave hexagonal main body comprises two horizontal cell walls and inclined cell walls arranged at two ends of the two horizontal cell walls, and the central points of the two inclined cell walls are bent towards one side close to the central points of the horizontal cell walls; the number of the bent wall rods is two, and the two bent wall rods are symmetrically arranged in the inwards-concave hexagonal body. The inherent contradiction that the stretching performance must be sacrificed when the rigidity of a traditional concave honeycomb structure is improved is successfully solved, and the negative Poisson's ratio effect and the energy absorption capacity of the structure can be further improved while the structural rigidity is enhanced.

The invention discloses a self-adaptive impact-resistant protective metamaterial with a Poisson's ratio autonomous constraint function, which comprises a PMP honeycomb, the PMP honeycomb comprises a plurality of honeycomb unit cell structures, and each honeycomb unit cell structure comprises a hexagonal thin-wall structure I and a hexagonal thin-wall structure II internally connected in the hexagonal thin-wall structure I. The invention further discloses a preparation method of the self-adaptive impact-resistant protective metamaterial with the Poisson's ratio autonomous constraint function. Compared with an SHC honeycomb, the PMP honeycomb has the advantages that the dynamic Poisson ratio of the PMP honeycomb is relatively stable in the whole crushing process, and the initial fluctuation range is only 0.1. In addition, the average dynamic Poisson's ratio of the PMP honeycomb is relatively small, indicating that the PMP honeycomb is almost free of transverse deformation without additional assistance. After the PMP honeycomb is compressed to be densified, the transverse length of the PMP honeycomb is only increased by 3.5%. Wherein the PMP honeycomb has better self-constraint capability, so that the PMP honeycomb has a more stable energy absorption mode.

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.

A steering column assembly includes a lower jacket. The steering column assembly also includes an upper jacket disposed within the lower jacket and being telescopingly adjustable relative to the lower jacket. The steering column assembly further includes a telescope drive assembly electrically moving a telescope drive nut axially to telescopingly adjust the upper jacket. The steering column assembly yet further includes an energy absorption strap directly coupled to the upper jacket and directly coupled to the telescope drive nut to transfer axial movement of the telescope drive nut to the upper jacket.

The invention relates to a concave angle asymmetric double-layer negative Poisson's ratio superstructure and application thereof. A concave angle asymmetric double-layer negative Poisson's ratio superstructure comprises bearing pressing plates symmetrically arranged at the upper end and the lower end and a plurality of unit cell elements arranged between the two pressing plates, and is characterized in that the unit cell elements are arranged at equal intervals in the transverse direction and the vertical direction respectively to form an m * n array, each unit cell unit comprises a double-layer concave corner body, transverse connecting rods on the two sides and a vertical connecting rod on the upper portion, the lower portion of each double-layer concave corner body is an outer flat plate cell wall, and the ends of the transverse connecting rods between every two transversely adjacent unit cell units are connected into a whole. And the end parts of the vertical connecting rods between the vertically adjacent unit cell elements are connected with the outer flat plate cell walls into a whole. The deformation mode of the superstructure is influenced by the impact speed, when the speed is increased, the deformation mode transits from overall deformation to local deformation, different local deformation zones are generated, the superstructure has different horizontal contraction processes at different impact speeds, the negative Poisson's ratio effect is reduced along with the increase of the speed, and the local deformation zones are reduced. The superstructure can be applied to anti-impact protection parts of automobiles, airplanes and unmanned aerial vehicles and anti-impact protection parts of wearable protection devices.

The invention provides a negative poisson ratio tension metamaterial structure and application thereof in impact resistance of an unmanned aerial vehicle. The negative Poisson's ratio stretch-draw metamaterial structure is composed of a plurality of two-dimensional D-bar stretch-draw integral structures. The two-dimensional D-bar stretch-draw integral structure is composed of a plurality of two-dimensional D-bar stretch-draw unit structures. The two-dimensional D-bar tensioning unit structure is composed of four same rod pieces, four rigid hinges and two same elastic ropes. Wherein every two of four rod pieces of the two-dimensional D-bar tensioning unit structure are connected through a rigid hinge to form a quadrilateral structure, and the four rigid hinges are diagonally connected and fixed through two elastic ropes; and two elastic ropes are adopted for fixing. Compared with other stretch-draw metamaterial structures, the stretch-draw metamaterial based on the two-dimensional D-bar has the advantages that the negative Poisson's ratio structure can be utilized to show better energy absorption characteristics, and when the unmanned aerial vehicle collides or falls off, impact force can be effectively dispersed, and damage to an aircraft body is reduced.

The invention relates to a nickel-titanium alloy buffering and energy-absorbing lattice structure and a preparation method thereof.The nickel-titanium alloy buffering and energy-absorbing lattice structure comprises a plurality of unit cells which are arranged in three directions perpendicular to one another in a three-dimensional space, and the number of the unit cells in the three directions is the same; each unit cell is a body-centered cube and comprises eight spiral supporting columns. Each unit cell is composed of a nickel-titanium shape memory alloy, the atomic percent of the Ni element in the nickel-titanium shape memory alloy is 50.0%-50.6%, and the balance is Ti atoms. According to the scheme provided by the invention, the concentration of stress and strain can be effectively relieved through the twisting and mutual supporting effects of the spiral supporting columns, the formation and expansion of a shear band are inhibited, and the repeated energy absorption capacity and damage tolerance of the nickel-titanium alloy lattice structure are improved.

The invention discloses a shear thickening fluid and gradient negative Poisson's ratio metamaterial composite impact-resistant energy-absorbing structure, which comprises an upper high-strength aluminum alloy plate, a lower high-strength aluminum alloy plate and a middle multi-layer gradient honeycomb core, the honeycomb core adopts a single reentrant hexagonal structure, and concave angles of each layer are gradually increased layer by layer to realize graded absorption and uniform dispersion of impact energy. The honeycomb units are filled with the shear thickening fluid, the shear thickening fluid is rapidly tackified at a high shear rate in the compression deformation process of the negative Poisson's ratio honeycomb core, and the energy dissipation performance of the composite protection structure is improved through cooperative energy absorption of the gradient negative Poisson's ratio honeycomb structure and the shear thickening dynamic thickening effect. All the layers are tightly connected through a high-strength interface bonding technology, and the overall structure is stable and durable. According to the invention, impact energy transfer is effectively blocked, light weight, simple process and cost optimization are taken into consideration, and the method is suitable for high-impact scenes such as aviation, automobiles and buildings, and has wide market prospects and application values.

In an energy absorbing member (10), a basic unit (20) with a U-shaped cross-section comprising a press-molded article is formed by a first sheet section (41) and a pair of second sheet sections (42, 42). An inner surface (21) and an outer surface (22) of the basic unit (20) that has been configured having the U-shaped cross section are contours that do not have an undercut shape in a direction along a reference line (CL2). The first sheet section (41) and the pair of second sheet sections (42, 42) have imaginary parallelograms (90) that extend from a first end surface (51) to a second end surface (52) of the basic unit (20) and are respectively deviated around an axis (CL1). At least one of two diagonals (91, 92) of each imaginary parallelogram (90) is formed by a fold line.

An energy absorption device for absorbing at least a portion of impact energy occurring in an impact of an impact body in a safety net construction includes at least one cable guiding unit forming at least one cable receiving region for receiving and / or guiding at least one cable, and further includes at least one energy absorption element, arranged in the cable receiving region and forming at least one friction surface for the guided cable, the energy absorption element being configured, if a force inducing movement of the cable across the friction surface is exerted on the cable, to selectively absorb at least a portion of energy the force created via substantial deformation and / or abrasion of the friction surface. A cable brake, particularly a block-and-tackle cable brake, includes an energy absorption element of the energy absorption device, which is arranged at the deflection element on a side facing toward the cable.

The invention discloses a chiral paper folding superstructure connecting pipe for vibration control, and relates to the technical field of structural mechanics and vibration reduction performance of cylindrical shell type connecting pipes. The invention aims to solve the problem that the existing chiral superstructure cannot meet the vibration reduction requirements under different frequencies. The structure comprises a plurality of superstructure unit cells, the superstructure unit cells are sequentially arranged from top to bottom in the axial direction, every two adjacent superstructure unit cells are connected through a set of unit cell connecting rods, the superstructure unit cells comprise a plurality of unit cells arranged in the circumferential direction, the upper ends of the unit cells are twisted anticlockwise, and the lower ends of the unit cells are twisted anticlockwise. And the upper end inner blade angle of each unit cell is connected with the lower end inner blade angle of the adjacent unit cell through a unit cell connecting rod, and the upper end outer blade angle of each unit cell is connected with the lower end outer blade angle of the adjacent unit cell through a unit cell connecting rod. The method is used for superstructure vibration reduction design.

The invention relates to the field of buffering energy absorption structures, in particular to a repeatable energy absorption structure formed by compounding an elastic material and an elastic plastic material, which comprises an energy absorption unit made of the elastic plastic material, the supporting unit is made of an elastic material; the supporting units are arranged between the energy absorption units and used for providing anti-deformation force when the energy absorption units absorb energy and providing restoring force after the energy absorption units absorb the energy. The elastic material is filled with the elastic plastic material, so that the area of a hysteretic loop of a force-displacement curve can be increased on the premise that the recovery rate is not reduced. Compared with a traditional repeatable energy absorption structure for increasing the hysteretic loop area through the friction effect, the elastic material and elastoplastic material composite structure increases the hysteretic loop area through the plasticity generated by repeated deformation of the elastoplastic material. The energy absorption structure can achieve repeated energy absorption, and the problem that most of existing energy absorption structures made of elastoplastic materials cannot achieve repeated energy absorption is solved.

A singular energy absorber and an offset pilot seat including the same. The pilot seat includes a seat base, a seat bucket positioned laterally offset relative to a centerline of the seat base, a singular motion controller movably coupling the seat bucket to the seat base, wherein the singular motion controller is centered relative to the seat bucket and laterally offset relative to the seat base, and the singular energy absorber associated with the singular motion controller, the singular energy absorber operative to maintain relative positions of components of the singular motion controller during normal use of the rotorcraft pilot seat and allow relative motion between the components of the singular motion controller during a dynamic event.

The invention relates to a vibration absorption unit with a three-dimensional negative Poisson's ratio effect and a vibration absorption device, and relates to the technical field of vibration reduction devices. The vibration absorption unit comprises a metal frame and a vibration absorption unit, wherein the metal frame has a three-dimensional negative Poisson's ratio effect; the elastic piece is arranged in the metal frame, and the elastic piece is connected with the inner wall of the metal frame; the load block is arranged in the metal frame, and the load block is connected with the elastic piece; and the fixing piece is connected with the elastic piece and the load block. The vibration absorption unit provided by the invention overcomes the defect that a traditional two-dimensional negative Poisson's ratio honeycomb structure only presents a negative Poisson's ratio effect in a single dimension, and is suitable for a multi-axis loading condition. Meanwhile, the metal frame is combined with the elastic piece and the load block in the metal frame, so that the vibration reduction effect at a specified frequency point can be achieved, the phenomenon that the low-frequency vibration line spectrum is prominent can be avoided, and when the external excitation frequency is close to the inherent frequency of the vibrator system, the energy of elastic waves is greatly absorbed; therefore, the propagation of elastic waves in the vibration absorption unit and the vibration absorption device is isolated.

An automotive body side structure includes collision energy absorptive parts provided on the outer peripheral side of a battery pack in a vehicle width direction in a protruding shape toward a vehicle outside in the vehicle width direction, and a recessed portion formed in the side sill to secure a space between the collision energy absorptive parts and the side sill. When a collision load is input to the side portion of the side sill, the timing at which the side sill and the collision energy absorptive parts contact each other is delayed, the collision load input to the side sill is transferred to the floor cross member until the side sill contacts the collision energy absorptive parts, after the side sill and the collision energy absorptive parts contact each other, the collision energy absorptive parts absorb the collision energy to reduce a load transferred to the battery pack.

The invention relates to the technical field of automobile passive safety protection, in particular to a bionic hierarchical multi-cell pipe energy absorption structure which comprises a multi-cell circular pipe and bionic hierarchical structure units, the multi-cell circular pipe is composed of five partition plates and a circular pipe, and the multi-cell circular pipe with five cell elements is formed; each bionic hierarchical structure unit is composed of triangular hierarchical units, a triangle is formed by connecting the midpoints of two partition plates of each cell element and the midpoints of corresponding arcs, and the triangular hierarchical units are formed by parity of reasoning; the triangular hierarchical units are distributed in each cell element in a gradient mode from large to small in the radial direction, and the triangular hierarchical units of the adjacent cell elements are connected with each other. The bionic hierarchical multi-cell pipe energy absorption structure is stable in deformation in the collision compression process, the platform force fluctuation range is small, collision force can be effectively absorbed, and the safety of passengers is protected. According to the bionic hierarchical multi-cell tube energy absorption structure provided by the invention, under the condition that the structural quality is not changed, the energy absorption characteristic is increased along with the increase of hierarchical orders.

The present invention relates to a crash-load absorbing attachment fitting (1; 101; 201; 301; 401), comprising a first and second part (3, 6; 103, 106; 203, 206; 303, 306; 403, 406) that are joined to each other at a joint (10; 110; 210; 310; 410), the first and second parts being load-bearing parts. The joint is configured such that the joint is capable of transferring, during normal use of the crash-load absorbing attachment fitting, a load (F) which is below a pre-determined load-absorption activation threshold value between the first and second parts, and such that the joint breaks when the load reaches or exceeds the pre-determined load-absorption activation threshold value. The crash-load absorbing attachment fitting further comprises a destroyer device (15; 115; 215; 315; 415), wherein the destroyer device is rigidly connected to and / or rigidly supported by one of the first and second parts and wherein the destroyer device is arranged so as to be capable of destructively acting on the other one of the first and second parts after breaking of the joint. Moreover, the invention proposes an aircraft or spacecraft (91) comprising a tank for storing hydrogen, in particular liquefied hydrogen, and at least one such crash-load absorbing attachment fitting (1; 101; 201; 301; 401), the tank being attached to a structural member (78) of the aircraft or spacecraft using the crash-load absorbing attachment fitting.

The invention belongs to the technical field of vibration isolation, and particularly relates to a quasi-zero stiffness metamaterial sandwich structure, a vibration isolation device and a manufacturing method. The quasi-zero stiffness metamaterial sandwich structure is formed by periodically arranging unit cells in the horizontal direction, and each unit cell comprises an upper panel, a lower panel, a QZS resonator core body and a vertical supporting column; the QZS resonator core comprises a central mass block, QZS resonator units are arranged on the upper portion and the lower portion of the central mass block in a mirroring mode, each QZS resonator unit is composed of two quasi-zero-stiffness unit cells which are arranged in a crossed mode, and each quasi-zero-stiffness unit cell is composed of a negative-stiffness component comprising a horizontal curved beam and a positive-stiffness component comprising an oblique straight beam. According to the sandwich structure, the quasi-zero-stiffness resonator of a novel structure serves as a core body, wider application in the ultra-low frequency vibration reduction field can be achieved, the band gap is adjustable, and the problems that a traditional metal base material structure is high in band gap frequency and limited in application field can be solved.

The invention relates to a pre-folded thin-walled tube structure filled with density gradient honeycombs. Comprising a pre-folded thin-wall square tube and a density gradient honeycomb filling structure filled in the pre-folded thin-wall square tube, the inner diameter and the outer diameter of the pre-folded thin-wall square pipe in the axial direction are not changed, the side wall face of the pre-folded thin-wall square pipe is a corrugated plate, the thickness of the corrugated plate is gradually increased from the near-impact side to the far-impact side in the axial direction of the pipe, the corrugated shape of the corrugated plate is a triangle, and the span of the triangle is gradually increased from the near-impact side to the far-impact side in the axial direction of the pipe. The density gradient honeycomb filling structure is formed by a plurality of thin-wall cell elements through a coincident boundary array, the cross section of each cell element is in a regular polygon shape, arc-shaped reinforced cell walls are arranged in all vertexes of the regular polygons, and the arc-shaped reinforced cell walls are gradually increased from the near-impact side to the far-impact side in the axial direction of the cell elements. The collision load transfer characteristic is remarkably improved, local damage and overall instability of the thin-wall structure are avoided, and the energy absorption efficiency of the thin-wall structure is improved.

An additively manufactured lattice includes a plurality of symmetrically oriented repeating unit cells. Each of the unit cells is comprised of a vertically oriented tubular structure having a top edge and bottom edge, said tubular structure defined by a circumferential side wall extending from said top edge to said bottom edge. The side wall has a lower portion, an intermediate portion, and an upper portion, with the lower portion terminating at the bottom edge, the upper portion terminating at the top edge, and the intermediate portion positioned between the lower portion and the upper portion. A plurality of spaced legs is included with each unit cell, with each leg formed as an outfolding of the side wall, each outfolding beginning at the side wall intermediate portion and extending progressively further outward through the side wall lower portion to the bottom edge.

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 present invention provides an embedded reinforced impact energy absorbing negative Poisson's ratio honeycomb lattice structure. The embedded reinforced impact energy absorbing negative Poisson's ratio honeycomb lattice structure comprises N embedded reinforced unit cells, each comprising a concave hexagonal unit cell structure and a sinusoidal structure embedded within the concave hexagonal unit cell structure. The embedded reinforced impact energy absorbing negative Poisson's ratio honeycomb lattice structure is formed by a periodic array of the embedded reinforced unit cells. The present invention effectively improves the compression stability, self-contact effect, specific energy absorption, and energy absorption efficiency of the negative Poisson's ratio honeycomb lattice structure, exhibiting excellent performance.