1815 results about "Honeycomb structure" patented technology

A pickleball paddle includes a handle, and a paddle head coupled with the handle. The paddle head includes a first outer faceplate, a second outer faceplate, and a core arranged between the first outer faceplate and the second outer faceplate. The core includes a honeycomb structure having multiple cells, with each of the multiple cells defined by honeycomb cell walls, and each of the honeycomb cell walls having a height. A majority of the multiple cells of the honeycomb structure are filled with a polymer, the polymer does not extend past the height of the honeycomb cell walls, and the polymer does not expand when exposed to heat.

An integrated carbon honeycomb structure material and its preparation method are disclosed, belonging to the field of carbon materials technology. Based on a co-sacrificial template low-temperature pyrolysis strategy, the target material can be obtained through three main steps: preparation of a metal salt-colloidal microsphere template precursor, precursor pressing and molding, and subsequent calcination and carbonization. This technology has the characteristics and advantages of simple preparation process, regular and controllable macroscopic structure of the sample (such as shape, area, and thickness), rich and tunable chemical composition, and three-dimensional interconnection of graphene carbon matrix. It has great application potential in many fields such as electrochemical energy storage, catalysis, gas separation, adsorption, and electromagnetic shielding.

The invention relates to the technical field of power transmission, in particular to a moisture-proof cable which sequentially comprises a conductive wire core, a gradient buffer layer, a dynamic sealing layer, a flexible supporting layer and a self-repairing sheath from inside to outside. A gradient buffer layer; the dynamic sealing layer is of a split type sealing structure formed by an outer ring surface sealing lip and an inner ring surface static sealing belt, the outer ring surface sealing lip is formed by embedding a polytetrafluoroethylene fiber reinforcing layer in a silicone rubber matrix, and the surface of the outer ring surface sealing lip is coated with a humidity response type graphene coating; the flexible supporting layer is formed by spirally winding a nickel-titanium alloy belt, and bionic fish scales are welded to the surface of the nickel-titanium alloy belt; the self-repairing sheath is characterized in that a hexagonal honeycomb structure is molded on the outer layer, hydroxyl-terminated polysiloxane and a platinum catalyst are contained in an A-type microcapsule, and modified epoxy resin is contained in a B-type microcapsule. The moisture-proof cable shows excellent corrosion resistance, moisture resistance and self-repairing capability in a humid environment, and can maintain good performance when subjected to external physical impact.

The invention relates to an integrated carbonaceous honeycomb framework lithium metal composite negative electrode and a preparation method thereof, and belongs to the technical field of lithium metal batteries, the integrated carbonaceous honeycomb framework lithium metal composite negative electrode is formed by depositing lithium metal in an integrated carbonaceous honeycomb framework host, and the host is constructed by adopting metal salt-colloidal crystal microsphere template precursor preparation, compression molding and controllable carbonization processes. The structure has a highly ordered three-dimensional integrated macroporous skeleton, and can realize rapid transmission and uniform electric field distribution of lithium ions and electrons, so that dendrite-free homogeneous lithium deposition under ultrahigh capacity is realized, volume expansion is remarkably inhibited, and the reversible stability of lithium metal deposition / stripping is improved. The invention provides an efficient and stable negative electrode solution for a high-energy-density lithium battery, and has an important application prospect.

An apparatus and a method are provided for a sports paddle for pickleball, tennis, smashball, ping pong, or racquetball. The sports paddle comprises a planar portion defining opposing flat surfaces for striking a ball and a handle portion for grasping in a hand. A skin layer encloses the planar portion and the handle portion. Rounded edges are disposed around the planar portion and the handle portion. The planar portion may comprise a core material surrounded by a rigid portion. The rigid portion may comprise 20-24 lb. foam while the core material is a honeycomb structured material. A synthetic or polymeric grip is wrapped around the handle portion to provide stability and firmness for a player. A binding secures the grip to a neck of the planar portion. An end cap placed at an end of the handle provides support and protection of the paddle.

The utility model discloses a mute floor which comprises a surface treatment layer, a protection layer, a decoration layer, a first carrier, a first buffer layer and a second carrier. The surface treatment layer is arranged on one side of the protection layer, the decoration layer is arranged on the other side of the protection layer, the first carrier is arranged between the decoration layer and the first buffer layer, the first buffer layer is arranged between the first carrier and the second carrier, and the first buffer layer is of a porous structure and / or a net structure. A buffer groove is formed in at least one side face of the first buffer layer and extends to the two ends of the side face. By arranging the floor with the first buffer layer with the porous and / or honeycomb structure, noise is reflected and refracted for multiple times in the porous and / or honeycomb structure, so that sound is attenuated, a sound wave propagation path is prolonged, and the effect of more effectively reducing noise propagation is achieved.

The invention provides an effective electromagnetic parameter acquisition method and device of a honeycomb structure, and relates to the technical field of electromagnetism. Firstly, a reflection coefficient data set and an effective electromagnetic parameter data set are constructed, a preset forward neural network is trained through the reflection coefficient data set, and a preset reverse neural network is trained through the effective electromagnetic parameter data set. Inputting a target parameter of a honeycomb structure to be measured, predicting a reflection coefficient through the trained forward neural network, and constructing a frequency-reflection coefficient curve based on the relationship between the reflection coefficient and the frequency; the frequency-reflection coefficient curve is processed through the feature vector matrix, and a feature curve of the honeycomb structure to be measured is obtained; and inputting the characteristic curve into the trained reverse neural network to obtain effective electromagnetic parameters of the honeycomb structure to be detected. The method does not need to depend on the traditional quasi-static hypothesis, can quickly and accurately obtain the effective electromagnetic parameters, and remarkably improves the obtaining efficiency and precision.

The invention discloses an energy-absorbing reinforced honeycomb structure with the Poisson's ratio capable of being adjusted positively and negatively and a design method, and relates to the field of honeycomb structures. Two horizontal outer ribs and four inclined outer ribs of the honeycomb structure form a hexagon; the two ends of the first arc-shaped inner rib are connected with the left upper vertex and the left lower vertex of the hexagon and are concave towards the left vertex of the hexagon; the second arc-shaped inner rib is connected with the right upper vertex and the right lower vertex of the hexagon and is concave towards the right vertex of the hexagon; two ends of one horizontal inner rib are respectively connected with the left vertex of the hexagon and the first arc-shaped inner rib, and two ends of the other horizontal inner rib are respectively connected with the right vertex of the hexagon and the second arc-shaped inner rib; and the circular ring is embedded in the convex parts of the two arc-shaped inner ribs. According to the honeycomb structure, the positive Poisson's ratio honeycomb and the negative Poisson's ratio honeycomb are fused through the two horizontal inner ribs, so that the inner ribs and the outer ribs are mutually balanced, the circular ring design is added, and the structural strength is improved; through the thickness parameter design of the inner ribs and the outer ribs, flexible transformation of the positive Poisson's ratio or the negative Poisson's ratio is achieved on the premise that light weight and high strength are guaranteed.

The invention relates to the technical field of river bank protection, in particular to a river bank slope protection for cofferdam construction and a construction method thereof. S2, construction of a near-water area structure; s3, construction of a far water area structure; s4, ecological enhancement; triple optimization of river bank protection is achieved through dynamic water level monitoring and modular design, a double-layer reinforced concrete and elastic sealant structure is adopted in a near-water area, the compressive strength is improved by 20%, the crack width is smaller than or equal to 0.2 mm, and material waste is reduced by 15% in cooperation with dynamic width adjustment (+ / -2 m); the mold bag concrete slope protection is combined with an atomization spraying system, the anti-scouring capacity reaches 5 m / (m.s), the vegetation coverage rate is larger than or equal to 80% within 3 months, and the water and soil loss rate is reduced by 70%; the modular honeycomb structure inflation assembly efficiency is improved by 40%, the transportation cost is reduced by 50%, the distributed sensors achieve structure displacement / pressure three-level early warning, the operation and maintenance cost is reduced by 70%, the overall service life is prolonged by more than 5 years, and an ecological-engineering collaborative protection system is formed.

The invention discloses a lightweight honeycomb structure shoe mold printing method based on an SLM process, and the method specifically comprises the following steps: S1, building a three-dimensional model of a shoe mold, and carrying out honeycomb embedding on the three-dimensional model of the shoe mold to obtain a lightweight three-dimensional shoe mold model; s2, the lightweight three-dimensional shoe mold model is uploaded to Msgics software for slicing processing and scanning strategy planning, and the lightweight three-dimensional shoe mold model is uploaded to SLM forming equipment; s3, after parameter setting is carried out on the SLM forming equipment, entity printing of the three-dimensional shoe mold model is carried out according to a scanning strategy; the invention relates to the technical field of additive manufacturing. According to the light-weight honeycomb structure shoe mold printing method based on the SLM process, through arrangement of honeycomb holes, the material consumption is reduced, meanwhile, light-weight design of the shoe mold is achieved, through edge enhancement design of the honeycomb structure, the bearing performance, the elastic modulus and the yield strength of the shoe mold are effectively improved, and the printing quality of the shoe mold is improved. And the high-efficiency preparation targets of light weight, high performance and low cost of the shoe mold are achieved.

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 copper surface micro-etching coarsening solution for a fine circuit as well as a preparation method and application of the copper surface micro-etching coarsening solution, and relates to the technical field of printed circuit board manufacturing. The copper surface micro-etching coarsening solution for the fine circuit is prepared from, by mass concentration, 60 g / L to 100 g / L of sulfuric acid, 40 g / L to 60 g / L of hydrogen peroxide, 0.5 g / L to 2 g / L of zinc sulfate, 10 g / L to 30 g / L of copper ions, 0.5 g / L to 1 g / L of pyridine heterocycle-containing Schiff base, 10 g / L to 100 g / L of ethyl alcohol, 1 g / L to 3 g / L of 2-mercaptobenzothiazole, 1 g / L to 5 g / L of methionine and 1 g / L to 5 g / L of polyacrylamide. According to the copper surface micro-etching coarsening solution, the 2-mercaptobenzothiazole and the methionine in the copper surface micro-etching coarsening solution can enable the copper surface to form a honeycomb structure under the low micro-etching amount, the zinc sulfate and the pyridine heterocyclic ring-containing Schiff base can form a composite film layer with copper ions on the surface of the honeycomb structure, and the interlayer binding force is improved.

The invention discloses a carbon-based metamaterial electromagnetic wave absorber and a preparation method and application thereof. The wave absorbing body adopts a three-layer composite structure, wherein the bottom layer is a copper plate reflecting layer; the lower layer is of a honeycomb-like structure and is formed by periodically arranging regular octagons and square hollow quadrangular prisms externally connected with the regular octagons, and the adjustable wave absorbing frequency band is achieved by adjusting and controlling the width and height of the hollow cores; the upper layer is of a pointed cone structure, and the impedance matching characteristic is enhanced by optimizing the vertex angle of the regular rectangular pyramid. The wave absorber is made of photosensitive resin, based on the photocuring 3D printing technology, honeycomb-like and pointed cone structures are printed step by step and bonded and combined, and high-precision forming is achieved in combination with parameterized regulation and control. The wave absorber has the advantages of light weight, broadband absorption and adjustable mechanical performance, can be applied to the fields of EMI shielding of electronic equipment, military radar stealth, high-frequency communication protection, electromagnetic environment protection and the like, and remarkably improves the electromagnetic wave absorption and shielding effectiveness through the metamaterial structure design and a multi-component cooperative loss mechanism.

The utility model discloses an aerogel structure and a battery cell module, and belongs to the technical field of batteries, and the aerogel structure comprises a frame member, a first electrode, a second electrode, a third electrode and a fourth electrode, the framework component is arranged in the through opening structure and assembled on the frame component, and the framework component forms a honeycomb structure; and an aerogel unit. The framework component with the cavity is arranged, the cavity is filled with air, a part of aerogel is replaced based on the heat insulation effect of the air, under the condition that the low heat conductivity of the whole structure is maintained, the use of the aerogel is reduced so as to reduce the cost, meanwhile, the honeycomb structure has high stability, efficient mechanical performance and excellent load bearing capacity, and the honeycomb structure is suitable for large-scale popularization and application. Normal stress can be borne, and the overall strength of the battery cell module can be improved.

The invention discloses a compact phase change heat storage honeycomb structure heterogeneous metal microdroplet interactive printing forming method, and belongs to the field of metal additive manufacturing. According to the method, the characteristic that aluminum alloy and a phase-change material are a solubility gap system is utilized, a micro-droplet interactive printing forming method is adopted, and aluminum alloy micro-droplets and phase-change metal micro-droplet double nozzles are controlled to conduct collaborative printing by designing a honeycomb structure and planning a printing track, so that alternate deposition and space integration of a structural material and the phase-change material are achieved; therefore, the compact honeycomb metal phase change heat storage structure is prepared. Compared with a traditional method, the method has the advantages that high-density integrated printing forming of the aluminum alloy and the phase change metal heterostructure can be achieved without reserving a flow channel, an exhaust hole and a packaging auxiliary structure, the manufacturing process is simplified, meanwhile, the compactness and the overall sealing performance of the heat storage structure are remarkably improved, and the manufacturing cost is reduced. The problem of high-heat-flux heat management in a narrow space is solved.

A preparation method of a foldable / unfoldable honeycomb structure lunar module can meet the requirements of astronauts living on extraterrestrial bodies, liquid transportation, pressure-resistant containers, etc. In the present invention, a planar circular ring sheet material is equally divided and marked, misaligned and connected, axially stretched, and then glued and cured at a specified position to obtain a foldable and telescopic hollow honeycomb structure; the structure shaping of the honeycomb structure lunar module is realized by stepwise curing of the resin coating on the honeycomb surface. The present invention proposes a new hollow honeycomb structure as the skeleton structure of the lunar module. The planar honeycomb structure has the advantages of low density and strong pressure resistance, and is applied to the sandwich of anti-theft doors, airplanes, corrugated cardboard, etc. When the planar honeycomb is bent, the honeycomb will be deformed, seriously affecting its mechanical properties. The novel hollow honeycomb structure not only has the advantages of the planar honeycomb, but also solves the problem that the planar honeycomb is difficult to be applied to curved surfaces.

The invention provides a solar cell and a photovoltaic module, and relates to the field of photovoltaic technology. The solar cell includes: a silicon substrate including a first surface and a second surface opposite to each other in a thickness direction of the silicon substrate; the first doping layer and the first passivation layer are sequentially arranged on the first surface; the first seed layer penetrates through the first passivation layer and is electrically connected with the first doping layer, the first base metal layer covers the first seed layer, the first base metal layer is electrically connected with the first doping layer through the first seed layer, and the first seed layer is of a honeycomb structure comprising a plurality of first holes; the first base metal layer comprises a plurality of first metal particles; an interface between the first base metal layer and the first seed layer includes a plurality of interface regions, and in a first interface region of the plurality of interface regions, the first metal particles are filled in the first holes. According to the invention, the cost of the battery is reduced, the conductivity, the drawing force and the structural stability of the electrode structure are improved, and recombination is reduced.

The invention relates to the technical field of biomechanical detection and automobile safety evaluation, and discloses an automobile collision dummy abdomen safety test device and method. The testing device comprises a human body feature modeling module which is used for establishing a target population abdomen parameterized model based on statistical analysis, determining a key size design domain covering target population percentile and constructing a target population metrology database; the abdominal mechanical property simulation module is used for obtaining a human tissue relative density distribution function based on the hyperelastic constitutive model, taking the density distribution function as an input parameter for manufacturing a gradient honeycomb structure and simulating human abdominal mechanical properties through relative density gradient distribution in the thickness direction; the multi-mode sensor integration module adopts a distributed intelligent sensing network architecture and is composed of a sensing layer, a transmission layer and a processing layer. By integrating pressure, deformation, acceleration and tissue stress sensors and combining a real-time feedback algorithm, collision parameters are dynamically optimized, and the test precision and the biological fidelity are improved.

The invention discloses a high-strength photovoltaic module structure and a preparation method thereof.The high-strength photovoltaic module structure comprises a core structure used for improving the elasticity modulus, fiber reinforcing layers are arranged on the end faces of the two sides of the core structure, the fiber reinforcing layers arranged on the end faces of the two sides are connected at the side edge parts, and fiber winding surrounding parts are formed on the side edges of the core structure; all the side faces of the periphery of the core structure form full-connection type fiber binding reinforced fixing. Fiber winding is carried out on the side edge of the honeycomb structure photovoltaic module, fibers in a lower panel of the photovoltaic module are connected with fibers in an upper panel of the photovoltaic module, the bending rigidity of the photovoltaic module can be further enhanced, and the fibers in the lower panel of the photovoltaic module and the fibers in the upper panel of the photovoltaic module are connected in the mode that the fibers are wound on the side edge. The bending rigidity of the photovoltaic module is effectively enhanced, and the problem that the improvement of the bending rigidity is limited due to weak side edges of the module in the prior art is solved.

The invention relates to a solid-state electrolyte membrane, a preparation method thereof and a solid-state battery, and belongs to the technical field of solid-state electrolyte materials. The solid electrolyte membrane is provided with a honeycomb structure framework, and the honeycomb structure framework is filled with a lithium-conducting copolymer and a lithium salt; the honeycomb structure framework is prepared from the following raw materials: a fluorine-containing polymer, an inorganic nano filler and a lithium-conducting polymer. The solid electrolyte membrane prepared by the embodiment of the invention meets at least one of the following indexes: the thickness of the solid electrolyte is 1-30 [mu] m, and the conductivity at room temperature is gt; 5.0 * 10 <-4 > S.cm <-1 >, and the ion transference number is gt; and 0.80, so that an ultrathin solid electrolyte structure which has rapid lithium ion transmission, high mechanical strength and a stable interface is obtained.

The invention discloses a broadband paper-based honeycomb microwave absorber with bidirectional impedance gradually changing, and relates to the technical field of electromagnetic protection radar stealth, the broadband paper-based honeycomb microwave absorber comprises a paper-based honeycomb structure, the paper-based honeycomb structure comprises N paper-based honeycomb units which are periodically arranged, and a bottom plate of each paper-based honeycomb unit is a grounded metal bottom plate; wherein each paper-based honeycomb unit comprises six honeycomb walls, the six honeycomb walls are a first honeycomb wall, a second honeycomb wall, a third honeycomb wall, a fourth honeycomb wall, a fifth honeycomb wall and a sixth honeycomb wall in sequence, and impedance gradual change structures are printed on the inner surfaces of the first honeycomb wall, the second honeycomb wall and the sixth honeycomb wall; or impedance gradient structures are printed on the inner surfaces of the second, fourth and sixth honeycomb walls; or impedance gradient structures are printed on the inner surfaces of the second, third, fifth and sixth honeycomb walls; the impedance gradual change structure is composed of carbon paste and silver paste, and bidirectional impedance gradual change from the free space to the grounded metal bottom plate is achieved. The paper-based honeycomb microwave absorber has the advantages of light bearing, wide band, low profile and small thickness.

A star-shaped negative Poisson's ratio honeycomb structure with double stress platforms comprises a plurality of star-shaped cell elements which are periodically arranged in the same plane in the transverse direction and the longitudinal direction, and each star-shaped cell element comprises a quadrangular star-shaped structure, a circular structure and two double-arrow-shaped structures; the quadrangular star-shaped structure is formed by connecting eight inclined cell walls end to end, so that a closed hollow structure which is symmetrical in the up-and-down and left-and-right directions is formed; the circular structure is embedded in the quadrangular star-shaped structure and intersects with four concave points of the quadrangular star-shaped structure; the two double-arrow-shaped structures are located on the left side and the right side of the quadrangular star-shaped structure respectively, each double-arrow-shaped structure comprises two long cell walls and two short cell walls, and the intersection point of the two long cell walls coincides with the inward concave point of the quadrangular star-shaped structure. Under the action of longitudinal compression, the double-stress-platform characteristic is shown, the good negative Poisson's ratio effect is achieved, the structural bearing capacity and the energy absorption efficiency can be improved, and the double-stress-platform metamaterial belongs to the technical field of mechanical metamaterials.

A pickleball paddle includes a first padding, two second paddings, an edge strip, and a grip. The first padding is a honeycomb structure made of polypropylene. The second paddings are bonded to two opposite surfaces of the first padding, and the second paddings each have a polypropylene layer and a fiber fabric bonded to the polypropylene layer. The edge strip is connected to the edge of the first padding and the edges of the second paddings, and the edge strip is made of a material including polypropylene. The grip is connected to the edge strip, and the grip is made of a material including polypropylene. Thus, the pickleball paddle of the present invention is easy to recycle and can reduce harm to the environment. Additionally, the present invention further includes a method of recycling the aforesaid pickleball paddle.

The utility model belongs to the technical field of building materials, and relates to an anti-skidding and shock-absorbing mute composite floor which sequentially comprises a resin layer, a mute layer, a base material layer, a balance layer and a shock-absorbing layer from top to bottom. Wherein the mute layer is a cork layer, and the thickness of the mute layer is 2-4 mm; the base material layer is a plywood layer, and the thickness of the base material layer is 7-9 mm; the balance layer is a plywood layer, and grooves which are uniformly distributed in parallel are formed in the surface of the balance layer; the damping layer is a foaming material layer, the thickness of the damping layer is 4-6 mm, and the damping layer is provided with evenly-distributed air channels. The mute layer is made of cork, is light in density and has soft and elastic touch feeling, cells of the cork are of a honeycomb structure filled with gas, have low conductivity on heat, noise and vibration and have a synergistic effect with the foaming damping layer at the bottom, and the surface is coated with the anti-skid coating with good flexibility, so that the anti-skid damping mute floor has a good impact sound absorption effect; the impact absorption performance is excellent, the head injury evaluation value is low, and the protection and mute effects are achieved.

The invention discloses a novel bionic arc-shaped reinforced re-entry honeycomb structure and a platform stress theoretical model, and arc-shaped supports are embedded into traditional re-entry unit cells by utilizing a bionic principle to trigger coupling deformation of multiple plastic hinges, so that the strength, rigidity, stability and energy absorption of the structure are remarkably improved. A platform stress theoretical model of the novel structure is provided based on an energy conservation principle, so that the cost of time, workload and the like of numerical simulation and experiments in a preliminary optimization design stage of the structure is remarkably reduced. Under the parameters of the invention, the platform stress and the specific energy absorption of the reentrant honeycomb structure are up to 10.4 times that of the traditional reentrant honeycomb structure, the rigidity and the stability of the reentrant honeycomb structure are improved to 11.7 times and 1.7 times, and the stable deformation mode and the crushing force efficiency of the reentrant honeycomb structure are superior to those of the traditional reentrant honeycomb structure. The composite material is suitable for scenes requiring high energy absorption and stable impact resistance, such as the protection fields of equipment such as pier collision resistance, canal collision resistance gates, automobile collision resistance, aircraft wing buffer layers and run-flat tires in civil engineering.

The invention discloses a bionic heterogeneous composite structure bone implant and a preparation method thereof, and relates to the technical field of medical implants.The bionic heterogeneous composite structure bone implant comprises an inner-layer cross-shaped structure, a middle-layer negative Poisson's ratio structure and an outer-layer honeycomb structure, and the cross-shaped structure, the negative Poisson's ratio structure and the honeycomb structure jointly form a bionic composite structure; and immersing the bionic composite structure subjected to double-network crosslinking into a drug-containing solution for post-treatment and drug loading to obtain the bionic heterogeneous composite structure. According to the invention, bionic adaptation and intelligent optimization of mechanical properties are realized, and the stress shielding problem is solved; according to the invention, osseointegration and vascularization processes are obviously accelerated and enhanced, and leap-type improvement of biological activity is realized; a novel intelligent treatment mode based on in-vivo microenvironment response is developed, and on-demand and accurate drug delivery is achieved.

The invention discloses a honeycomb structure wave-absorbing composite material based on resistive films and a preparation method thereof. The honeycomb structure wave-absorbing composite material comprises a glass fiber board skin layer, a first resistive film layer, a first honeycomb dielectric layer, a second resistive film layer, a second honeycomb dielectric layer, a third resistive film layer and a metal backboard. All the layers are connected through a bonding layer. According to the honeycomb structure wave-absorbing composite material based on the resistive film and the preparation method thereof, the sheet resistance in the first resistive film layer, the second resistive film layer and the third resistive film layer is controllable and customizable, so that impedance matching can be regulated and controlled by regulating and controlling the sheet resistance gradient of the resistive film, the process parameters are more stable, the broadband (2-18GHz) wave-absorbing performance is good, and the application prospect is wide. The first honeycomb dielectric layer and the second honeycomb dielectric layer do not need secondary processing, so that the wave-absorbing performance is endowed, and the resistive film is easy to prepare; in addition, the wave-absorbing composite material prepared by the invention is thin in structural material thickness, light in weight, capable of effectively absorbing a wide frequency band and easy to process.

The invention belongs to the technical field of hydroacoustic detection, and particularly relates to a high-precision multi-beam sonar with echo noise suppression, the high-precision multi-beam sonar comprises a sonar detector, a transducer and a heater, the transducer is arranged in the middle of the inner side of the sonar detector, and the heater is arranged in the sonar detector. The sonar detector converts electric energy into a sound wave signal through a transducer by arranging the flow guide cover, the honeycomb damping shell, the silica gel damping agent filling layer, the reflection energy absorption frame, the variable-diameter reflection hole and the active isolation mechanism, and the sound wave signal is propagated in water. When sound waves rebound after encountering obstacles and being reflected, the honeycomb damping shell converts sound energy into heat energy through viscous friction of the silica gel damping agent filling layer in the honeycomb damping shell, and the honeycomb structure prolongs the noise propagation time through multiple reflection paths. The active isolation mechanism guides gas in a high-pressure helium tank through a micro air pump and enables the gas to be sprayed out of an air spraying hole, a bubble curtain with the diameter smaller than 1 mm is continuously manufactured to form an impedance abrupt change layer, and the influence of noise is further reduced.

The present disclosure provides a thin-layer low-frequency underwater sound insulation metamaterial, including two cover plates and a sound insulation layer. The sound insulation layer is composed of sound insulation components arranged in an array periodically. The sound insulation components each include a sound insulation unit and four connecting units. The sound insulation unit is of a hollow rectangular column structure. The four connecting units are arranged at four corners of the sound insulation unit. Every two adjacent sound insulation units are connected through the connecting units. A long side wall of the sound insulation unit and the corresponding cover plate have an included angle of 0-90°. The metamaterial can obtain a smaller equivalent acoustic impedance in propagation direction of acoustic waves, and compared with a sound insulation material of a square honeycomb structure with the same thickness, the metamaterial has greatly improved sound insulation performance.

To perform heat exchange between a first fluid and a second fluid while suppressing increase in size of a heat exchange member.SOLUTION: A heat exchanger 7 includes a plurality of heat exchange members 5 and an outer wall part 6. Each of the plurality of heat exchange members 5 is a structure in which an outer peripheral surface of a honeycomb structure 1 is covered by a cylindrical covering part 4. The honeycomb structure 1 has a cylindrical outer peripheral wall, and a partition wall partitioning an internal space of the outer peripheral wall and extending in an axial direction. The partition wall forms a plurality of cells in which a first fluid flows. The plurality of heat exchange members 5 are arranged in parallel with each other at the same position in the axial direction. The outer wall part 6 forms a second flow passage 70 in which a second fluid flows which exchanges heat with the first fluid between itself and an outer peripheral surface of each of the plurality of heat exchange members 5, by covering the outer peripheral surface of each of the plurality of heat exchange members 5 in a state of being separated to the outside from the outer peripheral surface of each of the plurality of heat exchange members 5. Thereby, heat exchange between the first fluid and the second fluid can be performed efficiently, while suppressing increase in size of the heat exchange member 5.SELECTED DRAWING: Figure 1