481 results about "Structural rigidity" patented technology

The invention relates to the technical field of structure optimization design, and particularly discloses a box-type beam structure lightweight design method based on topological optimization, which comprises the following steps: constructing a multi-physics field coupled three-dimensional parameterized model, and performing cross-scale analysis on integrated structure rigidity, thermal deformation, vibration mode and fatigue life to obtain a three-dimensional parameterized model; a variable density method and level set method mixed topological optimization strategy is adopted, and an initial material distribution scheme meeting the structural function integrity is generated by modeling the relationship between density and stress strain; starting a quantum genetic algorithm and deep reinforcement learning fused intelligent optimization engine; according to the method, through the multi-physics field coupled three-dimensional parameterized model, a variable density method and level set method mixed topological optimization strategy is combined, the relation between the structural lightweight target and the additive manufacturing process is effectively balanced, multi-physics field analysis of thermal response, vibration, fatigue and the like is introduced, and the structural lightweight target is obtained. And it is guaranteed that the box-type beam meets the mechanical property and other functional requirements in actual application.

The invention relates to the technical field of bridge health monitoring, and discloses a method for judging rigidity change of a bridge structure based on bridge health monitoring deformation data. The method comprises the following steps: establishing an initial data set of bridge deformation monitoring data and performing multi-scale decomposition processing to generate deformation component data of different time scales; inputting the deformation component data of different time scales into a pattern recognition engine, and recognizing a characteristic pattern data stream associated with the structural rigidity; constructing a rigidity influence factor sequence based on the characteristic mode data flow, and calculating a statistical characteristic quantity of the rigidity influence factor sequence through a sliding time window; performing multi-dimensional matching analysis on the statistical characteristic quantity and a historical reference database, and outputting a stiffness anomaly probability index; and activating a hierarchical verification mechanism according to the stiffness anomaly probability index, and confirming a stiffness change trend through a cross validation algorithm. Reliable data support is provided for bridge structure health condition evaluation.

The invention relates to the technical field of mine safety, and provides a cross-layer roadway multi-rock-stratum rigidity matching collaborative segmented supporting method which comprises the steps that plastic zone ranges of different rock stratum areas in a cross-layer roadway are determined, and rock stratum joint fissure zones and weak intercalated layers are identified; monitoring the elastic zone rigidity and the plastic zone weakening rate of the surrounding rock, constructing a surrounding rock mechanical model, obtaining the supporting structure rigidity for inhibiting the expansion of the plastic zone through the surrounding rock mechanical model, and constructing a supporting structure according to the supporting rigidity; and the reinforcing material is sprayed to the surface of the surrounding rock through high-pressure jet flow to form a protective layer. Through the cooperative control thought of weak layer control, rigidity adjustment and resistance transfer, breakthrough transformation of crossing roadway support from passive defense to active control is achieved, according to a scientific surrounding rock mechanical model, the rigidity of the support structure can effectively inhibit expansion of a plastic zone, the stability of a system is maintained, and the stability of the system is improved. And finally, an ultrahigh strength performance and gradient spraying layer structure technology is adopted, so that the compression strength and the shear strength of the surrounding rock are remarkably improved.

The invention relates to the technical field of monitoring, in particular to a method and system for detecting and evaluating the corrosion risk of an offshore wind power steel structure. The method comprises the following steps: acquiring corrosion environment parameters and corrosion response parameters of a corrosion area in the offshore wind power steel structure; according to the corrosion environment parameters and the corrosion response parameters, the real-time corrosion rate of the corrosion area is determined; determining a local stress concentration factor of the corrosion area according to the three-dimensional scanning characteristics of corrosion deposits in the corrosion area; the dynamic pressure parameters of the marine environment serve as dynamic boundary conditions, the real-time corrosion rate and the local stress concentration factor serve as the basis, and the structural rigidity degradation amount of the steel structure in the corrosion area is determined through finite element iteration; according to the structural rigidity degradation amount, the structural safety coefficient of the steel structure in the corrosion area is determined; and determining the corrosion risk of the steel structure in the corrosion area according to the dynamic pressure fluctuation range of the marine environment and the structure safety coefficient of the steel structure in the corrosion area.

The embodiment of the invention provides a three-degree-of-freedom waist structure and a humanoid robot, and relates to the technical field of humanoid robots. The three-degree-of-freedom waist structure of the humanoid robot comprises a first joint mounting piece and a second joint mounting piece. And a waist turnover joint is arranged in the first joint mounting piece. The output end of the waist turnover joint is connected with the robot lower limb structure. And the second joint mounting piece is rotationally connected with the first joint mounting piece. And a waist side-sway joint and a waist pitching joint are arranged in the second joint mounting piece. The waist side-sway joint and the waist pitching joint are sequentially arranged in the direction of the output shaft of the waist pitching joint. And the output end of the waist side sway joint is connected with the first joint mounting piece through a crank connecting rod mechanism. The output end of the waist pitching joint is connected with the robot chest structure. A full series connection mode can be adopted, the whole structure is compact, the structure is prevented from being bloated, good structural rigidity is achieved, kinematics calculation and control of the series connection structure are simple, and the motion control difficulty is reduced.

The invention belongs to the technical field of tire engineering design, and discloses an engineering tire belted layer end structure finite element design analysis method and system. Comprising the steps of obtaining and preprocessing tire carcass contour data and initial belted layer parameters, conducting belted layer end parametric modeling on the basis of a standardized tire geometric model, constructing a durability finite element analysis model to obtain a stress-strain distribution field, conducting multi-parameter sensitivity analysis to determine a key influence factor weight matrix, and obtaining a stress-strain distribution field. And optimally designing a belted layer end structure based on the matrix, and finally performing durability verification and evaluation. According to the method, through accurate geometric expression, flexible parametric modeling, accurate performance analysis and multi-objective optimization design, belted layer end stress distribution uniformization and structural rigidity optimization are achieved.

The invention discloses a foundation pit excavation and support cooperative control method based on finite element dynamic feedback, which comprises the following steps: S1, establishing a foundation pit support finite element model, defining constitutive parameters of a soil body small strain hardened soil model HSS and support structure rigidity, and obtaining an initial displacement field and a stress field through step-by-step excavation simulation; and S2, iteratively calibrating parameters based on the simulation result and the field monitoring data, and constructing a construction stage dynamic adjustment threshold library which comprises a displacement warning value (UXmax), a stress safety coefficient (SF is greater than or equal to 1.3) and a support activation time sequence. According to the method, dynamic parameter iteration is achieved, a finite element model is reversely optimized through monitoring data, and the parameter solidification problem of a traditional method is solved; automatic closed-loop control is achieved, manual intervention is reduced, and the response speed is increased to the minute level; and economical efficiency is improved, waste of materials such as steel is reduced through accurate control, and the comprehensive cost is reduced by 15%-25%.

The invention belongs to the technical field of data processing, and particularly relates to a lithium battery homogenizing equipment state monitoring method and system.The method comprises the steps that a torque signal and an angular speed of a stirring shaft, a strain signal of a slurry tank wall and a slurry solid content set value are collected, and the effective viscosity of slurry and the equivalent rigidity of equipment are calculated; constructing a stirring system kinetic equation containing a fluid damping item and a structural rigidity item, decoupling to obtain a fluid resistance component and a mechanical resistance component, performing kernel smoothing regression modeling on standard working condition data under different operation stages and solid content conditions, and matching a corresponding model according to a current working condition to obtain a dynamic state of the stirring system; a mechanical resistance reference value is obtained by combining the real-time fluid resistance component, and a mechanical resistance residual error is calculated; by comparing the difference between the residual error and historical normal distribution, the health index of the equipment is determined, and graded monitoring and fault early warning of the homogenate equipment state are achieved. According to the invention, process fluctuation and mechanical abnormity can be effectively separated, and monitoring accuracy and reliability are improved.

The invention discloses a high-strength heat-insulation aerogel structure with a dual multi-scale design and a preparation method thereof, relates to the technical field of thermal protection of spacecrafts, and in particular relates to the high-strength heat-insulation aerogel structure with the dual multi-scale design and the preparation method thereof. The invention aims to solve the problems of insufficient structural rigidity and poorer thermal protection property and thermal stability of the traditional spacecraft surface aerogel structure under the conditions of extreme high temperature and mechanical load. The structure is composed of an upper carbon-carbon composite material plate, a lower carbon-carbon composite material plate, an alloy skeleton and a filler. The method comprises the following steps: 1, preparing a multi-scale C / C composite material; 2, designing and preparing a titanium alloy honeycomb framework; 3, proportioning the multi-scale aerogel; 4, in-mold in-situ gelation; 5, drying and heat treatment; and 6, assembling and solidifying. The porosity of the aerogel is 85-98%, the structure has high rigidity and thermal protection performance, and the aerogel is applied to the field of aerospace thermal protection.

The invention discloses a solid rocket engine bearing structure lightweight determination method based on a carbon fiber composite material, and relates to the technical field of composite material structure design, and the method comprises the steps: obtaining the structure size and geometric shape of a fixed body; replacing a titanium alloy material with a carbon fiber composite material, and determining a carbon fiber composite material structure response model based on a finite element modeling method; determining an optimal layering scheme based on structural response sensitivity analysis and a multi-objective optimization method; then determining a thickness optimization scheme based on the structural size and geometric shape of the fixed body and load distribution; determining a reinforcement optimization scheme based on a parametric modeling method; determining a metal reinforcement configuration by adopting a structural rigidity-quality collaborative evaluation method; and finally, determining a lightweight structure of the fixed body based on a composite material layering process design method. The mass of the fixing body structure can be reduced, the mechanical property of the fixing body structure is improved, and the high-performance design requirement of a solid rocket engine is met.

The invention relates to a self-adaptive force output and energy consumption bridge vibration and vibration control inerter tuning device, and belongs to the technical field of vibration control. Comprising a roll shaft support, a spring rod, a main inerter element, a box chamber main body, a secondary inertia flywheel, a flow guide pipe, a transmission connecting rod and a flow baffle, the main inerter element penetrates through and is arranged in the box chamber main body, the outer end of the main inerter element is connected with the spring rod, the spring rod is connected with the roll shaft support, and the roll shaft support is respectively fixed with the bottom surface of a main beam and the top of a bridge pier; in addition, the flow guide pipe is arranged in the box chamber body, a flow baffle and a transmission connecting rod are further arranged in the flow guide pipe, and the transmission connecting rod is further connected with a secondary inertia flywheel. The damping device is achieved through a hydraulic mechanism, and the damping device with the self-adaptive inerter coefficient is formed through linkage of the inerter devices in the main box chamber and the auxiliary box chamber, so that the purposes of changing the inerter coefficient in real time and damping are achieved. The shock resistance, the transmission efficiency, the energy consumption effect, the structural rigidity and the stability of a vibration reduction system can be improved.

The invention relates to the technical field of carbon fiber design, and discloses a carbon fiber composite material lightweight design method and system.The method comprises the steps that a lightweight design scheme of a carbon fiber composite material is generated based on the real-time environment of the carbon fiber composite material in combination with a carbon fiber distribution cloud atlas, determining a layering design domain of the carbon fiber composite material according to the lightweight design scheme, obtaining a main bearing direction of the layering design domain, matching a rigidity response corresponding to an angle in the layering design domain, obtaining a corresponding rigidity value of the layering design domain, and obtaining a corresponding rigidity value of the layering design domain; the deviation of the corresponding rigidity value is corrected on the basis of the main bearing direction, and the corrected corresponding rigidity value serves as the mapping relation between the laying layer angle and the structural rigidity in the carbon fiber composite material. The prior art generally has the problem of poor adaptability between a layering scheme and an actual working condition.

The invention discloses a ship sensor measuring point optimization method and system, and relates to the technical field of sensor measuring point optimization, and the method comprises the steps: generating a fractal hierarchical weight matrix through a fractal geometric model based on pre-obtained ship navigation working condition data, and carrying out the load sensitivity analysis through the combination of pre-obtained sea area observation data, obtaining a dynamic load sensitive matrix; a morphological load coupling weight matrix is obtained, a preset ship body layout node set is combined, a layout optimization algorithm is utilized to carry out sensor measuring point layout of guide type search, and candidate measuring point layout is obtained; and carrying out time domain dynamics simulation by using the simulation model, carrying out ship whole-field structure state reconstruction in combination with a state inversion method, and optimizing the candidate measuring point layout to obtain an optimized measuring point layout. The spatial-temporal variability of external excitation is fully considered, and the problem of high-rigidity low-response misjudgment possibly caused by a traditional method only depending on structural rigidity or mass distribution is avoided.

The invention relates to the technical field of intelligent control, and discloses an optical lens flexible clamping identification control method and system, and the method comprises the steps: constructing a composite supporting structure, adjusting the rigidity of the composite supporting structure, selecting an optimal wave band to calculate the spectral reflectivity, introducing polarization features, constructing an anti-reflection defect detection algorithm, and correcting the spectral reflectivity; a modular clamping unit based on topological structure recognition is constructed, edge feature extraction and shape classification are performed on an optical lens, optimization force distribution is calculated, strategy weight is dynamically adjusted according to a task completion rate by calculating strategy entropy and introducing a loss function in a combined manner, the rigidity of the optical lens is calculated, and force control or position control is adopted in a differentiated manner; based on the rigidity of the lens, constructing a self-adaptive clamping structure, minimizing the deformation energy of the lens, and calculating and predicting the residual life; a three-level heterogeneous computing architecture is constructed based on a self-adaptive clamping structure, state synchronization of a physical system and a virtual mirror image is realized, and a defect detection model in an anti-reflection defect detection algorithm is cooperatively trained.

The invention discloses a bridge disease unmanned aerial vehicle multi-sensor cooperative detection method, and relates to the technical field of bridge monitoring, and the method comprises the following steps: generating a corrosion layering thickness distribution condition through a spectrum matching algorithm; acquiring three-dimensional point cloud data of the surface of the bridge through a laser radar carried by an unmanned aerial vehicle, and generating deformation distribution data; calculating a local stiffness degradation coefficient matrix according to the thickness distribution condition of the erosion layer, and inputting the local stiffness degradation coefficient matrix into the finite element model to generate predicted deformation distribution data; comparing the deformation distribution data generated in the step 2 with predicted deformation distribution data to generate residual data, generating a dynamic detection priority map by the residual data, and marking a bridge area needing to be remeasured; and executing the re-flight planning detection strategy. Structural rigidity parameters are dynamically corrected according to the corrosion layering thickness, model precision is optimized by combining actual measurement deformation data feedback, closed-loop optimization is formed through data interaction, and the problem of one-sidedness of single sensor detection is solved.

The invention relates to the technical field of optimization design and fatigue life analysis, and discloses an open combined deck weld joint arrangement and fatigue life collaborative topological optimization method, which comprises the following steps of: establishing a finite element model of an open deck and performing statics analysis; material distribution is optimized by adopting a topological optimization technology, high and low density areas are distinguished, and welding seams are reasonably arranged at junctions; the optimization result is verified and iteratively adjusted; and carrying out fatigue analysis based on the optimization model, and carrying out secondary topological optimization by taking the fatigue life as a constraint condition. According to the technical scheme, the lightweight design of the open deck is achieved, meanwhile, the structural rigidity and strength are improved, the fatigue life is prolonged, material energy consumption is effectively reduced, and the method is suitable for optimal design of complex structures such as ships and ocean platforms and has wide application prospects.

The invention discloses a high-frequency vibration absorption fastener design method for restraining local bending mode vibration of a steel rail. The method comprises the following steps that a finite element analysis model of the steel rail is established according to the set length and steel rail parameters, a rail model under the harmonic excitation condition is established, and a relational expression met by the overall rigidity and damping of a double-layer fastener model is established; constructing a kinetic equation of vertical movement of the iron base plate; constructing a target optimization function for designing the track fastener system based on the error; and constructing a cost model of the fastener in the production process, optimizing cost control of fastener design, outputting the quality of the iron base plate, the rigidity of the upper layer structure and the rigidity of the lower layer structure under the optimal cost control, and designing the fastener system. According to the method, high-feasibility solutions are provided for relieving local bending modal vibration of the steel rail, high-order polygons of wheels and corrugation of the steel rail.

The invention belongs to the technical field of heavy-load vehicle control, and particularly discloses a bottom die trolley walking control method and system, and the control method comprises the steps: starting a task and setting parameters; collecting multi-dimensional data in real time; a displacement target is judged; calculating theoretical motion parameters; target torque distribution and instruction adjustment; and finishing the task and resetting the system. According to the control method, torque control, speed control, displacement control and energy consumption optimization are fused, a closed-loop feedback strategy, a fuzzy PID self-adaptive algorithm and a multi-motor cooperative algorithm are utilized, and track pre-detection and energy recovery are combined, so that the heavy-load and high-rigidity bottom die trolley can still run stably and accurately under the non-ideal track condition, and the control method is suitable for large-scale production. The control precision and stability of trolley running are remarkably improved, running deviation caused by poor rails and structural rigidity is reduced, the linear and dimensional precision of segmental beam prefabrication is guaranteed, and meanwhile the equipment failure rate, the maintenance cost and the energy consumption are reduced.

The invention belongs to the technical field of bridge engineering, particularly relates to a bridge stress state diagnosis method based on digital twinning and movable sensing, and aims to diagnose the real-time stress state of a bridge with diseases. The method comprises the steps of obtaining existing disease space data of a bridge, implanting disease parameters in a twin model, and generating an initial twin body of the bridge with the disease; a modular monitoring station formed by movable sensing devices is deployed on a bridge, data are transmitted to an edge computing terminal through a Mesh ad hoc network between the devices, and the edge computing terminal executes data preprocessing. In the monitoring period, vehicle load, temperature and humidity, displacement or vibration data are injected into the initial twinborn body of the diseased bridge in real time, an FEM-disease coupling algorithm is established to dynamically correct a structural stiffness matrix, and a digital twinborn body is formed. And establishing a stress state diagnosis index system, comparing the responses of the digital and healthy twins under the same load, calculating the variation amplitude of each diagnosis index, marking a structural health degree map, and judging whether the bridge has an abnormal stress state.

The invention provides equipment and a method for measuring the static rigidity of a bridge girder erection machine. The method comprises the following steps: determining the strain contribution degree of each stage of static load to a target bridge girder erection machine through strain data of the target bridge girder erection machine under each stage of static load; according to all the strain contribution degrees and the structural characteristics of the target bridge erecting machine, determining the loss gradient of the strain state in the target bridge erecting machine when the static load increases progressively, and determining the dominant strain mode of each stage of static load to the bridge erecting machine based on the loss gradient of the strain; according to the displacement data and the strain data of the target bridge girder erection machine under each stage of static load, determining an inter-stage coupling residual error between each adjacent static load on the target bridge girder erection machine; and determining the structural stiffness of the target bridge girder erection machine under each stage of static load based on the static stiffness measurement model in combination with all the dominant strain modes and the inter-stage coupling residual errors between the adjacent static loads. By adopting the scheme of the invention, the influence of the displacement and strain coupling relationship on the measurement of the static rigidity of the bridge girder erection machine during dynamic strain change can be reduced.

A dismantlable pallet including a substantially planar, upper load bearing member with a reinforcing internal frame; a substantially planar, lower supporting base with a reinforcing internal frame configured to improve the structural rigidity and load bearing capacity of the base. The pallet further includes a plurality of spaced apart support members sandwiched between the load bearing member and the base defining apertures between the load bearing member and the base, rendering the pallet releasably engageable with conventional and compatible load transporting apparatuses; and at least one releasable fastener to secure the load bearing member to the base with their respective reinforcing internal frames and the support members sandwiched between the member and the base wherein the load bearing member and the base are made of a rubber compound selected from the group including hardness, tensile strength, tear resistance, abrasion resistance, temperature resistance, impact resistance, slip resistance and moisture resistance.

Described are glass articles comprising a first glass-based layer, a second glass-based layer, and a polymer layer disposed between the first glass-based layer and the second glass-based layer. The first and second glass-based layers may comprise coefficients of thermal expansion that differ from one another by at least 0.5 ppm / ° C. The first glass-based layer may comprise a thickness that is less than or equal to 300 μm, while the second glass-based layer may comprise a thickness that is greater than 2.0 mm. The second-glass based layer may provide structural rigidity to the article, while the first glass-based layer may render impact-induced damage less visible and less prone to negatively effecting optical performance.

The invention discloses an efficient identification method for connection rigidity of a steel pipe pole of a power transmission line, which relates to the field of structural health monitoring, and comprises the following steps: constructing a multi-scale finite element model of the steel pipe pole, acquiring displacement and frequency response of the structure to carry out parameter sensitivity analysis, and screening key correction parameters; constructing a key parameter-structure response sample data set, and training and optimizing an FEA-Net neural network model; and constructing a Bayesian correction framework, solving posterior probability distribution by adopting a TMCMC algorithm, and realizing the probabilistic identification of the connection stiffness and the systematic correction of the finite element model. By constructing a local refined contact model, a bolt pretightening force-connection rigidity corresponding relation is established, and an effective means is provided for verifying whether the rigidity of the corrected model is matched with the rigidity of an actual structure or not. The structure rigidity damage position can be accurately recognized, the rigidity degradation degree can be quantified, and a high-credibility model basis is provided for safety evaluation, digital twinborn construction and operation and maintenance decision making of engineering structures such as electric transmission line steel pipe poles and the like.

The utility model discloses a high rigidity machine tool work table, which comprises a work table shell, a work table top and a driving mechanism, the driving mechanism is provided with a main shaft which is matched with the work table top and is used for driving the work table top to rotate, and a bearing seat which is used for being matched with the main shaft through a bearing assembly in a rotating mode is concentrically arranged in the work table shell. Bearings of the bearing assembly are arranged in the axis direction of the main shaft. The working table is fixedly connected with the end part of the main shaft; the lower part of the working table surface is in running fit connection through a working table bearing arranged on a bearing seat, and a sealing mechanism for sealing the space where the working table bearing is located is arranged on the outer side of the working table bearing; the bearing, the workbench shell and the main shaft are concentrically arranged in a penetrating mode, the bearing is arranged in the axial direction of the main shaft to support the main shaft, and the overall structural rigidity of the workbench can be improved; and through cooling oil ways arranged in the bearing seat and the motor shell, the whole workbench is cooled in all directions, and continuous operation of the workbench is guaranteed.

The invention provides a composite energy dissipation self-resetting steel frame connecting joint and a steel frame, belongs to the technical field of assembly type steel structures, and aims at solving the technical problems that a traditional steel frame is large in residual deformation after an earthquake, difficult to maintain and multiple in potential safety hazards. Comprising a steel frame column, a steel frame beam, a self-resetting sliding energy dissipation mechanism and a self-resetting rotating energy dissipation mechanism. The self-resetting sliding energy dissipation mechanism is connected between the steel frame column and the side face of the end of the steel frame beam and can absorb energy through stretching and retracting, and the self-resetting sliding energy dissipation mechanism is arranged between the steel frame column and the upper side face and / or the lower side face of the end of the steel frame beam. The self-resetting rotating energy dissipation mechanism is connected between the steel frame column and the end face of the end of the steel frame beam and can absorb energy through rotation. And the technical effects of good self-resetting and energy consumption during an earthquake, improvement of structural rigidity stability and reduction of post-earthquake maintenance cost and period are achieved.

The invention relates to the technical field of data processing, in particular to an elastic frame optimization design method and system based on the finite element theory, and the method comprises the steps: constructing a nonlinear finite element model of an elastic frame, and for each node, determining the sealing reliability of the node based on the normal contact stress value, fluid pressure value and displacement vector of the node; for each unit, determining a fluid permeation trend factor of the unit based on the sealing reliability of the nodes in the unit, remodeling a material relative density iterative updating formula of the optimization criterion method by using the fluid permeation trend factor, updating the material relative density of each unit, generating an optimal topological configuration, and carrying out the optimal topological configuration; therefore, the optimal design of the elastic frame is completed. According to the method, the problem of high-pressure leakage caused by neglecting microscopic sealing in traditional topological optimization is solved, and synchronous optimization of the structural rigidity and the sealing performance under the ultrahigh-pressure working condition is achieved.

The invention belongs to the technical field of rub-impact force calculation, and discloses a blade-coating casing normal rub-impact force calculation method considering a heat-wear effect. Based on a one-dimensional unsteady state heat conduction theory, analytic expressions of temperature rise and linear thermal expansion of the blade and the casing are respectively established, and instantaneous temperature change in each contact process is considered. Secondly, physical modeling of various abrasion mechanisms (such as cutting type abrasion, adhesive abrasion and microcrack abrasion) is introduced, and the influence of coating gap changes on the contact force is effectively captured; in addition, the composite stiffness characteristics of the casing coating and the supporting structure are further integrated, so that the rub-impact force calculation can cover the response characteristics under different structural stiffness conditions. Through finite element comparison and experimental verification, the calculation method disclosed by the invention shows relatively high precision in the aspects of predicting thermal deformation, contact force and wear trend, and provides powerful support for subsequent rub-impact fault diagnosis and structural design.

The invention discloses a V-Ti-Ni shape memory alloy with high elasticity modulus and high hardness and a preparation method of the V-Ti-Ni shape memory alloy. The preparation method comprises the steps of raw material proportioning, V-Ni pre-alloy smelting, vacuum induction smelting and argon protection pouring, multi-pass hot forging and hot rolling and fine cold drawing, and particularly, 7-9 at% of vanadium element is introduced, so that the diameter phi of the prepared V-Ti-Ni shape memory alloy wire is 0.10-0.50 mm. According to the V-Ti-Ni shape memory alloy prepared through the method, the elasticity modulus at the room temperature reaches 100-110 GPa, the microhardness is 320-360 HV, the phase transition temperature regulation and control range of the NiTi-based shape memory alloy is widened, and the structural rigidity, abrasive resistance, plasticity and cycle stability of the V-Ti-Ni shape memory alloy material are remarkably improved. The V-Ti-Ni shape memory alloy prepared through the method is mature in process route, can be produced in batches and is suitable for precise elastic components in medical instruments, micro electro mechanical systems, thermal actuators and spaceflight structures.

The invention discloses a composite material fastening structure which is used for fastening products made of composite materials and comprises reinforcing ribs, an inner ring layer, an outer ring layer, a filling layer and a surface layer. The inner ring layer is an annular composite material laying layer distributed on the inner side, forms an accommodating space, is in direct contact with a product placed in the inner ring layer and is used for fastening and protecting the product in the inner ring layer; the outer ring layer is used for tightly combining the components and assisting the inner ring layer to realize fastening; the filling layer is located between the inner ring layer and the outer ring layer and used for filling a cavity between the inner ring layer and the outer ring layer and providing end structure rigidity. The surface layer is an outermost protective layer of the whole structure; the reinforcing ribs are main structures for improving the rigidity of the end structure, the invention further provides a manufacturing method of the composite material fastening structure, and the composite material fastening structure can provide huge end face structural rigidity on the premise that the self weight is small, end pressure generated by an internal product is remarkably resisted, and the structure of the internal product is compact and dense.

The application discloses a numerical control rotary table integrated structure, which comprises a linear slide rail, a linear slide table and a rotary shaft table. The linear slide rail is arranged along a preset direction and is provided with slide rail grooves which are parallel to each other on the two side walls. The linear slide table is symmetrically provided with slide blocks which are matched with the linear slide rail at the bottom, and the slide blocks are embedded in the slide rail grooves. A circular groove is formed in the middle of the linear slide table, and a plurality of positioning holes are formed in the groove bottom of the circular groove. The rotary shaft table is provided with positioning columns which are matched with the positioning holes at the bottom, and the rotary shaft table is installed in the circular groove through the cooperation of the positioning columns and the positioning holes, and the outer peripheral wall of the rotary shaft table is tightly combined with the inner wall of the circular groove. Through the structural optimization and the innovative design of the linear slide rail, the linear slide table and the rotary shaft table, the assembly error in the traditional structure is eliminated, the overall height of the rotary table is reduced, the structural rigidity is improved, and the machining precision, the stability and the service life of the numerical control rotary table are improved.