3001 results about "Energy absorption" patented technology

The invention relates to the technical field of bolt tightening, and provides an intelligent bolt tightening control method and system based on axial force measurement. Comprising the steps of collecting bolt identification and process parameter data, collecting temperature measurement data, and obtaining sound velocity compensation parameters and elastic modulus compensation parameters. And zero-load preloading data are collected and processed to generate zero-load baseline data, and a self-calibration model is obtained. Axial force data and ultrasonic echo data are collected, and an axial force fusion estimation result is obtained. And comparing an axial force fusion estimation result with target axial force data. And when in the target interval, fine twisting control is carried out based on model predictive control and a micro-stepping strategy, and the controllable damping unit is driven to carry out energy absorption and stopping. And acquiring an axial force fusion estimation result when the target axial force is reached, processing the data in the holding stage to obtain an axial force rebound check result, and if the axial force rebound check result exceeds the limit, performing secondary twisting control. According to the scheme, refinement and traceability of the bolt tightening process are achieved.

The invention discloses a digital calibration system and method for dynamic response parameters of a surge protection circuit, relates to the technical field of power electronic protection and test calibration, and is used for solving the problem that an existing surge protection circuit calibration method cannot reflect device degradation and dynamic response mismatch. Surge event voltage and current waveforms are collected through a synchronous trigger mechanism, non-stationary signal features are extracted through combined time-frequency analysis, and a voltage-current phase trajectory diagram is constructed to generate a response feature matrix; performing phase-space reconstruction on the matrix, calculating Kolmogorov entropy quantification system stability, and establishing a material degradation transfer function in combination with an energy absorption sequence to generate a grain boundary degradation index; key parameters are screened through L1 regularization regression, and a quantitative relation between a grain boundary degradation index and a protection threshold value is established to realize adaptive threshold value calculation; and executing strategy switching from calibration to predictive maintenance according to the degradation trend and threshold fluctuation change, and outputting a maintenance signal to complete dynamic accurate calibration and reliable operation of the surge protection circuit.

A pickleball racket includes a racket frame, a racket face and a handle. The handle is connected to one end of the racket frame, the racket frame is arranged around the racket face, the racket face and the racket frame enclose to form a filling cavity filled with elastic components. The pickleball racket has excellent elastic property, improves energy absorption and rebound efficiency, and improves the user's usage experience.

The invention discloses a multi-parameter collaborative optimization design method for lateral impact resistance of a honeycomb sandwich panel battery pack, and relates to the technical field of structural safety and lightweight design of new energy automobile battery packs. An existing battery pack generally has the defects of insufficient light weight, limited energy absorption efficiency and lack of multi-parameter collaborative optimization with an upper box body, a lower box body and a stiffening beam in impact resistance research. Therefore, according to the honeycomb sandwich panel battery pack lateral impact resistance multi-parameter collaborative optimization design and parameter calculation method, a honeycomb sandwich panel finite element model is established, performance parameters are obtained, an optimal energy absorption combination is screened, then a battery pack box body finite element model is established, and multiple design variables are set; and constructing a function relationship between variables and responses by utilizing an agent model, and carrying out multi-objective optimization by combining an NSGA-II algorithm to finally obtain an optimal design parameter meeting a safety threshold and carrying out simulation verification. The method is suitable for battery pack anti-impact protection design work of the electric automobile under the lateral collision working condition.

The invention discloses a pressure storage and heat storage coupled regenerative heat pump power storage system and a regulation and control method thereof. The system is composed of an electric-power generation integrated unit, an energy storage compression and energy release expansion integrated unit, an energy storage expansion and energy release compression integrated unit, a high-temperature heat exchanger, a backheating heat exchanger, a cold energy absorption heat exchanger, a heat storage and cold storage storage tank, a high-pressure gas storage tank and the like. And an energy storage / energy release loop, a heat storage / heat release loop, a cold storage / cold release loop and a pressure heat coupling loop are formed by connecting pipelines. In the energy storage mode, the compressor unit is driven by electric energy to conduct multi-stage compression, and compression heat and expansion cold are stored in the high-temperature storage tank and the low-temperature storage tank correspondingly. In the energy release mode, the heat storage medium and the cold storage medium are sequentially released to supply heat or cold to the circulating working medium, and the expansion unit is driven to drive the generator to generate electricity. According to the method, bidirectional operation of energy storage and energy release is achieved through valve switching and circulation control, and power output and load change are adjusted within a second level through a pressure-heat coupling mechanism.

The invention provides a coal mine fluidized mining dynamic disaster prevention and control method and system, and relates to the technical field of disaster prevention and control. The method comprises the following steps: establishing a risk map based on mining area multi-field information, setting a seismic source intensity upper limit, a path attenuation target and an energy absorption displacement target, implementing in-situ transformation under the constraint of a control index to form a distributed micro-fracture network, and calculating a residual dynamic load spectrum to weaken a seismic source; according to the residual dynamic load spectrum, constructing an artificial barrier and an energy absorption band with wave impedance abrupt change so as to realize propagation energy reduction; a flexible energy absorption protection system is configured according to the residual dynamic load spectrum and the propagation attenuation coefficient, micro-seismic, stress and displacement data are monitored in real time, and parameter self-adaptive correction is achieved through linkage treatment triggered by a threshold value. According to the method, a source-diameter-field integrated active prevention and control system is constructed, dynamic regulation and control and closed-loop management in the fluidized mining process are achieved, and the intrinsic safety and the intelligent level of deep mining are remarkably improved.

The invention discloses a damping shell easy to assemble and a kitchen waste processor using the damping shell. The damping shell comprises a shell body, an upper end cover is fixedly connected to the upper portion of the shell body, a plurality of supporting cushion blocks are fixedly connected to the upper portion of the bottom end of the shell body, and a plurality of fixing rod pieces are fixedly connected to the periphery of the upper end cover downwards; the top surface of the vibration isolation base is upwards and fixedly connected with hoisting rod pieces corresponding to the fixed rod pieces, and the hoisting rod pieces are respectively fastened and mounted on the corresponding fixed rod pieces through corresponding locking assemblies, so that the vibration isolation base is positioned on the upper side of the supporting cushion block to form suspension mounting; the vibration isolation supporting assembly comprises a rotating plate rotationally installed on the bottom side of the vibration isolation base, the periphery of the rotating plate extends outwards to be provided with supporting parts, and the bottom sides of the supporting parts are fixedly connected to the upper sides of the corresponding supporting cushion blocks in an abutting mode; provided is a vibration reduction and energy absorption device. The vibration reduction effect can be effectively and obviously improved, and the machine core of the kitchen garbage processor can be conveniently installed.

A lower vehicle-body structure of a vehicle is provided that increases energy absorption in a side collision. A vehicle body includes a first reinforcement (main reinforcement) and a third reinforcement (sub-reinforcement) which are disposed in a closed cross-section of a side sill. The first reinforcement has a hat shape including an upper wall (second wall), a lower wall (first wall), and a vertical wall extending in an up-down direction. The third reinforcement and lower wall together form a plurality of second closed cross-sections (sub-closed-cross-sections). The third reinforcement is disposed on a lower surface of the lower wall. The side sill inner portion includes a corner portion that is a deformation promoting portion to be deformed inward of the side sill in a side collision of the vehicle such that it is brought into contact with the third reinforcement from the outer side in the up-down direction.

The invention relates to the technical field of coal mine safety mining, and discloses a coal mine roadway high-stress area unloading-to-suction danger relieving method which comprises the following steps: step 1, a pressure relief stage: drilling holes in a roadway high-stress area to form a pressure relief channel; 2, a transfer stage, wherein stress is transferred to the deep part of the coal rock mass through the layout of the drill holes; and (3) an energy absorption stage: an energy absorption device is installed in the drill hole, the device comprises an outer steel pipe, an internal high polymer material and a monitoring element, the diameter of the drill hole in the step (1) is 50-150mm, the depth of the drill hole is 5-20m, a one-time hole forming process is adopted for construction, and the drill hole is formed in a high stress concentration area which is 6-20m away from the surface of the roadway and is arranged at intervals in the axial direction of the roadway. By constructing a pressure relief-transfer-energy absorption three-stage synergistic effect system, the whole-process dynamic regulation and control of the surrounding rock stress of the roadway is realized, and the problem that the pressure relief effect is uncontrollable due to the fact that a stress transfer path is not clear in the prior art is effectively solved.

The invention provides a compression-torsion coupled metamaterial cell element and a negative Poisson's ratio energy absorption structure composed of the compression-torsion coupled metamaterial cell element, and relates to the technical field of compression-torsion energy absorption metamaterials. The cell element comprises an upper connecting plate assembly and a lower connecting plate assembly, an upper-layer four-rod tensioning assembly and a lower-layer four-rod tensioning assembly are arranged between the upper connecting plate assembly and the lower connecting plate assembly, each of the upper-layer four-rod tensioning assembly and the lower-layer four-rod tensioning assembly comprises four compression rigid rod pieces and a plurality of tension elastic bodies, the compression rigid rod pieces are staggered in space to form a quadrangular prism-like frame, and the tail ends of the upper compression rigid rod piece and the lower compression rigid rod piece are hinged; adjacent hinge points and two corresponding corners of the surfaces of the upper connecting plate assembly and the lower connecting plate assembly are connected through tensile elastic bodies and apply pre-tightening force; the energy absorption structure is formed by combining a plurality of cell element arrays, and the negative Poisson's ratio effect is achieved by regulating and controlling the arrays. According to the cell element, a tensioning structure is integrated into a metamaterial configuration, the cell element has the compression-torsion coupling characteristic, the non-localized deformation response of the structure is achieved, and the energy absorption structure has the negative Poisson's ratio effect and provides excellent bearing and impact resistance through an efficient energy absorption mechanism.

The invention relates to the technical field of sound absorption, noise reduction and impact resistance, in particular to a multifunctional tunable bionic sound absorption and collision prevention integrated superstructure and a preparation method thereof.The multifunctional tunable bionic sound absorption and collision prevention integrated superstructure comprises a shell, an upper sound absorption layer, a lower sound absorption layer and a middle collision prevention layer, the sound absorption layer is provided with a plurality of curved-surface microwell plates which are connected end to end to form a cavity, and the embedded pipe is combined with the cavity to form a Helmholtz resonator; the anti-collision layer is composed of an energy absorption unit array. The preparation method comprises the steps that a three-dimensional model is firstly built, then a laser scanning mode and parameter printing are set, then heat treatment is conducted, then cutting and layer taking are conducted, and finally the superstructure is manufactured through glue joint. The sound absorption and noise reduction functions and the energy absorption and anti-collision functions are integrated, the sound absorption performance is improved through the bionic structure, energy is efficiently absorbed through the middle layer dot matrix, adjustable performance and lightweight design are achieved through parameterized design, the additive manufacturing process is simple, convenient and efficient, and large-scale production and application are facilitated.

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 belongs to the technical field of metamaterials, and particularly relates to a diamond substrate lattice metamaterial and an additive manufacturing method thereof. The structure is designed based on the geometric configuration of a diamond lattice, and has excellent high specific absorption mechanical properties. The design process comprises the following steps: firstly, carrying out spatial registration positioning on the basis of a unit cell structure with a preset wall thickness t and a unit cell width a; then, through a multi-unit-cell splicing design, the unit cells are spliced repeatedly for 12 times to form three-dimensional periodic stacking; then, the stacked structure is cut along the six datum planes; then cross plates are inserted into the six cutting faces respectively to enhance the integrity and strength of the structure; and finally, a complete DM plate lattice metamaterial structure is formed. The structure is provided with a plate-plate cross supporting framework, a complex three-dimensional inner cavity and highly symmetrical space distribution, the energy absorption capacity under unit mass is greatly improved, the mechanical properties are basically consistent in multiple directions, and the structure is suitable for the engineering fields of impact protection, energy absorption buffering and the like.

The invention discloses an industrial robot motion planning system and method based on artificial intelligence, and belongs to the field of industrial robot intelligent obstacle avoidance. Based on a visual sensor, a depth sensor and a material priori library, feature extraction and attribute judgment are performed on an obstacle, and the risk is preliminarily evaluated; based on a force control sensor at the tail end of the robot and low-speed contact motion, contact force and displacement curve changes are obtained, the deformable characteristic of an obstacle is evaluated, and based on a deformation potential value, contact force and displacement curve analysis, contact stress calculation and obstacle energy absorption calculation, the damage risk of the obstacle is evaluated. The contact impact energy and the damage coefficient of the robot are evaluated based on the quality, the running speed and the anti-seismic coefficient of the industrial robot, the danger of the robot facing the obstacle is comprehensively evaluated based on the obstacle initial judgment risk, the damage probability and the robot damage coefficient, and the working efficiency and safety of the industrial robot are improved.

The invention discloses an all-dielectric structure type broadband wave-absorbing metamaterial and a design method thereof. The all-dielectric structure type broadband wave-absorbing metamaterial comprises a substrate and a plurality of resonators, the plurality of resonators are periodically and uniformly arrayed on the surface of the substrate, the adjacent resonators are connected with each other, each resonator comprises a pyramid structure unit and a grid structure unit, the pyramid structure units are nested in the grid structure units to form a pyramid-grid composite resonator, and the substrate and the resonators are both made of a high dielectric loss composite material. Based on the brand new design angle of wave absorbing performance complementation, the limitation of the wave absorbing performance of a single structure is broken through, the wave absorbing performance is improved from the microstructure level, meanwhile, efficient electromagnetic wave energy absorption is achieved in a wider frequency range, multi-stage dissipation and broadband impedance matching of incident electromagnetic waves are achieved, and the wave absorbing performance is improved. And the technical limitation of thickness constraint and narrow-band response of the traditional wave-absorbing material is broken through.

An integrated energy absorbing system of a vehicle with a front integrated energy absorbing casting and a back integrated energy absorbing casting. Each front and back casting is a single unified casting that makes up the integrated energy absorbing system. Ribbed sections such as “I” sections and “C” sections make up the castings and are formed from a variety of different techniques and / or formings such as cutout, waveform profile, tapering, flaring and / or rib spacing. Additional sections such as closed section castings may also be integrated in the integrated energy absorbing system.

The invention relates to the technical field of lattice structure topological optimization, and discloses a multi-scale hybrid lattice structure double-variable topological optimization method, which comprises the steps of defining double variables, including a first design variable as a scaling scale and a second design variable as a relative density; determining a basic unit cell of the hybrid lattice structure and obtaining a corresponding unit cell size, wherein the second design variable is determined based on the unit cell size; obtaining a first filling unit cell and a second filling unit cell; determining a design domain, and filling the first filling unit cells and the second filling unit cells into the design domain by taking the flexibility minimization of the hybrid lattice structure as a target and the volume fraction as a constraint; and optimizing the filling process based on a moving asymptote optimization algorithm so as to carry out topological optimization of the hybrid lattice structure based on double variables, and outputting an optimized multi-scale hybrid lattice structure. According to the industrial bearing structure, higher structural specific stiffness, specific strength and energy absorption efficiency are achieved, and the requirements for light weight, self-adaption and high performance in an existing industrial bearing structure can be met.

The invention discloses a kilometer deep well roadway toughness regulation and control supporting system and a dynamic design method, and belongs to the field of deep well roadway supporting. The supporting system comprises a multi-layer collaborative structure and an intelligent regulation and control module, the multi-layer collaborative structure sequentially comprises a shape memory alloy energy absorption layer used for resisting impact loads and a gradient pore foam metal buffer layer used for energy grading dissipation from inside to outside, and the multi-layer collaborative structure is connected with roadway surrounding rock in an anchoring mode through an anchor rod anchoring structure; the intelligent regulation and control module comprises a distributed optical fiber sensor array used for monitoring surrounding environment signals of surrounding rock in real time, an electrostriction driver used for regulating and controlling the rigidity of the multi-layer cooperative structure and a multi-channel data fusion terminal used for achieving underground and surface data transmission synchronization. By the adoption of the kilometer deep well roadway toughness regulation and control supporting system and the dynamic design method, the problems that a traditional supporting mode is too high in material rigidity, lacks dynamic regulation and control capacity and is insufficient in impact toughness can be solved.

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 provides a high-pile wharf anti-seismic toughness evaluation method and system based on finite elements, and relates to the technical field of high-pile wharfs, and the method comprises the steps: firstly constructing a finite element soil body model and a finite element wharf model at a high-pile wharf, and forming a finite element coupling model after coupling for simulating an earthquake situation under a real condition; after simulated seismic waves are applied to the finite element coupling model, the damage condition of the soil body, the damage index of the wharf, the energy dissipation of the wharf and the ductility coefficient of the wharf under the action of the seismic waves are analyzed respectively; wherein the damage index, the energy dissipation coefficient and the ductility coefficient are used for evaluating the damage degree, the energy absorption and consumption capacity, the deformation capacity and the ductility of the wharf respectively, fitting analysis is conducted on analyzed parameters, a comprehensive toughness evaluation index for reflecting the anti-seismic capacity of the high-pile wharf is generated, and finally the anti-seismic grade of the wharf structure is output. Workers are assisted to complete shock resistance toughness evaluation of the wharf, and the working efficiency is greatly improved.

The invention provides an innovative design of a corrugated pipe damper integrated on a sliding main bearing aiming at the problems of transmission system abrasion and fatigue damage caused by vibration energy accumulation of the wind power main bearing under a complex wind load, and belongs to the technical field of wind power generation equipment. A traditional main bearing damping structure is low in energy absorption efficiency, insufficient in dynamic response and difficult to effectively suppress vibration. Through collaborative design of a corrugated pipe multi-stage laminated structure and a fluid energy dissipation channel, a composite mechanism for dynamically dissipating vibration energy is formed. The core of the damping device is composed of a corrugated pipe assembly, damping cavities and a main shaft adaptive structure, impact energy is absorbed through axial flexible deformation of the corrugated pipe, vibration attenuation is achieved in combination with reciprocating flowing of damping fluid in the multiple cavities, and low-frequency swing and high-frequency harmonic waves of a main bearing are synchronously restrained. According to the design, the bearing capacity is guaranteed, vibration transmission is remarkably reduced, the service life of the main bearing is effectively prolonged, the operation reliability of a unit is improved, and the damping requirement of a core transmission system of a high-power wind turbine generator is met.

The invention discloses a UHPC-foam concrete composite material with a sandwich structure and a preparation method of the UHPC-foam concrete composite material. The composite material comprises two ultra-high performance concrete (UHPC) panel layers, a foam concrete sandwich layer of a negative Poisson's ratio three-dimensional framework prepared through a photocuring three-dimensional printing technology is arranged between the two ultra-high performance concrete (UHPC) panel layers, and the three-dimensional framework is of an inward-concave honeycomb topological structure and has the characteristic of transverse expansion after being pressed; impact stress can be effectively dispersed, and a dual energy dissipation path is formed through a synergistic effect with a porous energy absorption mechanism of the foam concrete. The panel layer and the sandwich layer are combined through a layered pouring process, and an interface is subjected to scabbling treatment so as to enhance the bonding strength. The composite material is superior to a traditional material in the aspects of compressive strength and energy absorption performance, is suitable for the fields of anti-explosion buildings, military protection engineering, frontier defense facilities and the like, and has a wide application prospect.

The invention discloses a strong anti-overturning power generation device and method based on wind wave combined capture, and the device comprises a four-column type semi-submersible fan platform and a wind driven generator located above the four-column type semi-submersible fan platform, and the four-column type semi-submersible fan platform comprises hollow columns. The bottom of the hollow stand column is fixedly connected with the bottom of the outer side stand column through a horizontal column, a floating wave energy absorption system is arranged on the outer side of the outer side stand column, and the output end of the floating wave energy absorption system is connected with the input end of a power generator system through a bevel gear power generation system in the hollow stand column. One end of the floating wave energy absorption system is connected with the spring system in the hollow stand column; the core technical problems that an existing device is poor in stability, high in cost, low in efficiency, weak in adaptability and the like are solved.

The invention relates to a negative Poisson's ratio composite anti-explosion wallboard unit, an anti-explosion wallboard structure and a construction method of the anti-explosion wallboard structure. The anti-explosion wallboard unit comprises an impact protection layer, a negative Poisson's ratio steel plate layer, a multifunctional back plate layer and a buffering energy absorption layer from outside to inside. The outer surface of the impact protection layer is an anti-impact wave curved surface; the negative Poisson's ratio steel plate layer is composed of two layers of negative Poisson's ratio steel plates which are arranged in parallel, a containing cavity is formed in each layer of negative Poisson's ratio steel plate, a plurality of rhombic negative Poisson's ratio units are evenly distributed in each containing cavity, and hinge joints are formed between the end points of the rhombic negative Poisson's ratio units and the inner wall of a cavity body of each containing cavity; the multifunctional backboard layer comprises a support body and an assembly space arranged along the back surface of the support body, and the assembly space is used for detachably embedding a functional board; and the buffer energy absorption layer is used for absorbing and dissipating residual energy attenuated by the layers. Through a multi-stage collaborative energy consumption mechanism of curved surface deflection, negative poisson ratio structure energy absorption, back plate dispersion and elastic body buffering, the anti-knock performance and the energy dissipation efficiency of the wallboard are remarkably improved.

The utility model relates to the field of new energy, and discloses a battery bottom protection plate which comprises an impact release layer, a first fiber reinforced resin layer, a metal layer, an impact absorption layer and a second fiber reinforced resin layer, and the first fiber reinforced resin layer, the metal layer and the second fiber reinforced resin layer are all arranged between the impact release layer and the impact absorption layer. And the impact release layer, the first fiber reinforced resin layer, the metal layer, the second fiber reinforced resin layer and the impact absorption layer are laminated. The battery bottom guard plate has the beneficial effects that the battery bottom guard plate adopts the design concept of gradient energy absorption and has high impact resistance, and meanwhile, the multi-layer composite structure can be produced in different processes, so that the heat dissipation between layers is reduced, the interface bonding force is improved, the reliability of the bottom guard plate is improved, the protection function of the bottom guard plate is ensured, and the service life of the bottom guard plate is prolonged. And the battery pack can be well protected.

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 discloses steel fiber reinforced metakaolin-based recycled concrete and a preparation method thereof, and belongs to the technical field of civil engineering materials. The concrete is prepared from the following components in percentage by mass: 60wt%-80wt% of recycled aggregate, 20wt%-40wt% of a cementing material, 0.5 wt%-1.4 wt% of steel fibers and 0.1 wt%-0.7 wt% of an additive, wherein the cementing material comprises cement and metakaolin, and the mass ratio of the metakaolin to the cement is (1-3): (7-9). A nano silicon dioxide coating is arranged on the surface of the steel fiber. The preparation method adopts a step-by-step stirring process. The problem that dynamic impact resistance and green low carbon are difficult to cooperate in the prior art is solved, through component optimization and process control, the dynamic compressive strength of the concrete is improved, the energy absorption capacity is improved, the damage mode is converted into ductility from brittleness, fiber distribution is uniform, and the concrete is suitable for impact-resistant projects such as airport runways and protective structures.

The invention relates to the technical field of ultrasonic riveting, in particular to a 224G high-speed wire harness assembling method and system based on ultrasonic riveting, and the method comprises the steps: carrying out the pretreatment of a high-speed wire harness raw material, and obtaining a pre-riveted wire harness; aligning the pre-riveted wire harness with a pre-constructed target connector to obtain a to-be-riveted wire harness; riveting the to-be-riveted wire harness by using the ultrasonic parameter value, the environment temperature value and the riveting time, and monitoring the to-be-riveted wire harness during riveting in real time based on the riveting monitoring instruction to obtain a compression deviation value and an energy absorption value; based on the compression deviation value and the energy absorption value, acquiring an updated ultrasonic frequency value by using a fuzzy control algorithm, and acquiring a pre-confirmed high-speed wire harness by using the updated ultrasonic frequency value; and performing quality detection on the pre-confirmed high-speed wire harness to obtain a target high-speed wire harness, and realizing the assembly of the high-speed wire harness based on the target high-speed wire harness. According to the invention, high-precision assembly of the high-speed wire harness can be realized by utilizing ultrasonic riveting.

The invention relates to the technical field of aero-engine nondestructive testing, and discloses a method for detecting defects and thickness of a surface coating of an aero-engine blade. The invention designs a novel acoustic impedance sensor special for a blade coating, the novel acoustic impedance sensor comprises a plurality of independently controlled transduction units, each transduction unit has multi-band detection capability, main resonant frequencies of different transduction units are configured in a differentiated manner, and during detection, the novel acoustic impedance sensor is coupled to the surface of a blade; the material state is reversely deduced by measuring the energy absorption spectrum of broadband sound waves in the coating, and the blade surface coating defect and thickness detection is achieved.

The invention discloses a cutting fluid drainage nozzle of a high-measurement slicing machine, which belongs to the technical field of cutting processing equipment and comprises a base, a drainage panel, an adjustable composite damping support module, a piezoelectric adjusting strip, a microcirculation flow channel network, a vibration sensing system and a control system. Comprising a high-molecular polymer damping material layer and a high-strength light alloy restraint layer, a piezoelectric ceramic actuator is embedded, passive damping energy absorption and active vibration counteracting are achieved, a piezoelectric adjusting strip is fixed in a drainage groove, and the dual functions of local vibration suppression and flow control are achieved; vibration sensing monitors the vibration state in real time through a plurality of piezoelectric acceleration sensors, the control system achieves working condition self-adaption and frequency division cooperative control through a neural network algorithm, cooperative work is achieved through multiple vibration reduction mechanisms, the vibration suppression effect is improved, the line breakage rate is reduced, meanwhile, the functions of fault diagnosis and predictive maintenance are achieved, and the reliability of the system is improved. And the cutting precision and efficiency and the equipment intelligence level are improved.