412 results about "Structural rigidity" patented technology

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a sliding time window; performing multi-dimensional matching analysis on the statistical characteristic quantity and a historical reference database, and outputting a stiffness anomaly probability index; and activating a hierarchical verification mechanism according to the stiffness anomaly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 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 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 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 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.

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.

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 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.

The present application relates to the technical field of structural design of construction engineering, and especially relates to a large-span roof tensile membrane structure and a design method thereof; the large-span roof tensile membrane structure comprises: no less than two non-draining boundaries and one draining boundary; the tensile membrane is tensiled between the non-draining boundaries and the draining boundary; the non-draining boundaries are located at the same elevation or different elevations; and the draining boundary is in a concave arch shape. The present application constructs a tensile membrane structure which does not rely on arches, cables, struts and other supporting members, forms a negative Gaussian surface by concave design of the membrane boundary, forms a draining path along the concave direction, and realizes organized drainage of the tensile membrane structure. Meanwhile, under the action of prestress, the membrane structure of the negative Gaussian surface has a structural rigidity which meets the use requirements. The corresponding design method can determine the size of the concave of the outer boundary of the tensile membrane based on the geometry of the roof structure of different shapes. The tensile membrane structure and the design method thereof proposed by the present application can avoid the influence and limitation of the traditional membrane structure modeling and internal supporting members on the architectural effect, maximize the realization of the demand for transparent and light architectural effect, and at the same time avoid water accumulation of the membrane structure.

The application discloses a left-right splicing type motorcycle control method and system based on rigid connection. The scheme proposes a rigid-flexible integrated construction method, and a flexible control system is constructed on a rigid truss. The rigid truss guarantees the structural integrity of the vehicle body and the conduction of force, the Ackermann geometry correction model is used to correct the Ackermann geometry relationship, the sensor data is used to correct the steering angle and driving torque in real time, the dynamic weight model is used to predict the controller to coordinate the steering and torque distribution of the two sides of the wheel, and the steering error, the vertical vibration error and the slip rate error are optimized, so that the multi-objective cooperative control problems such as load transfer, vertical disturbance, differential constraint and steering stability are solved. The application takes into account the overall structural rigidity and the control system flexibility, can effectively suppress the slip and vibration caused by the road disturbance, significantly improve the response speed and precision of steering and driving, and ensure the stability and safety under complex road conditions.

Methods and devices are provided for fabricating and employing patient immobilization devices during radiation treatment procedures. Immobilization devices are provided that include a thin conformal shell configured to conform to an anatomical region of a patient that is to be exposed to radiation during a radiation treatment procedure, with a rigid lattice structure extending outwardly, in an external, beam-facing direction, from the conformal shell. The rigid lattice structure confers structural rigidity to the device, and the thin cellular regions mitigate the impact of the device on a surface dose delivered to the patient or subject. The present mechanical-metamaterial-based immobilization devices incorporate structural features that confer advantageous mechanical properties and radiation transmissive properties when compared with conventional solid or mesh-based immobilization devices used in radiation therapy.

The invention relates to the technical field of arch bridge construction, and discloses a cable hoisting system profile steel tower mounting construction method which comprises the following steps: S1, adopting H-shaped steel as a tower stand column, and bolting the H-shaped steel through a gusset plate and a high-strength bolt; and S2, the tower stand columns are assembled in a different-position mode, the standard sections and the non-standard sections are combined, so that the flange connecting faces of the adjacent stand column sections are not located on the same horizontal plane, and the height difference is formed. H-shaped steel is adopted as a tower stand column, lattice type transverse connection and inclined connection are formed through channel steel and angle steel, a space lattice type bearing system is formed, the structural rigidity is large, the overall stability is good, the core innovation is that the dislocation splicing technology is adopted, and the standard sections and the non-standard sections with different lengths are combined, so that the space lattice type bearing system is formed. And the flange connecting surfaces of the adjacent stand columns naturally form height difference, so that the weak anti-shearing link caused by the fact that all flanges of a traditional tower are located on the same horizontal plane is eliminated, and the overall anti-shearing capacity, safety and reliability of the tower are greatly improved.

The invention belongs to the field of unmanned aerial vehicle rotor power systems, and particularly relates to a compact rotor power system tension measurement structure and a design method thereof, and the method comprises the following steps: selecting an annular tension sensor which is geometrically compatible with a motor shaft and has a redundant range according to the size parameter and the maximum theoretical tension of a rotor motor; a force transmission assembly used for bearing an axial load is arranged between the lower end of the motor shaft and the annular tension sensor, and an axial limiting component matched with the force transmission assembly is arranged; constructing an axial stacking size chain based on the height of the force transmission assembly, the size of the limiting component and the height of the sensor, and determining the axial extension amount of the motor shaft and the mounting position of the limiting component according to the axial stacking size chain; and a mounting base for enveloping the force transmission assembly and the annular sensor is designed, so that the motor stator and the base are fixed to form a compact integral structure. By simplifying a force transmission path and shortening a dimension chain, the number of parts and the axial height are remarkably reduced, and the structural rigidity and the measurement stability are improved.

The invention relates to the technical field of building construction, in particular to a formwork multi-stage erecting device. According to the technical scheme, the device comprises a bottom plate, an arch shell structure template made of a colloid flexible film, a fixing mechanism, an inflation mechanism, an internal air bag and an auxiliary mechanism. The multiple bottom plates are quickly connected through the splicing mechanism, and a stable foundation is formed. The adjusting mechanism achieves accurate adjustment and control of the shape of the arch shell structure formwork through the synergistic effect of a supporting base, a top push plate, a pushing plate, a threaded rod and a connecting rod assembly. The inflation mechanism inflates the formwork to form the formwork, the structural rigidity is enhanced through an internal air bag, and the auxiliary mechanism keeps the internal air pressure stable through a pressure sensor and a controller. The problems that in traditional arch shell formwork erecting, the operation efficiency is low, and adaptability is poor are solved, rapid erecting, accurate shape adjusting and stable forming of the formwork are achieved, the construction efficiency and quality are remarkably improved, and the method is particularly suitable for a large-span arch shell structure and formwork engineering under the complex working condition.

The invention relates to the technical field of urban construction, in particular to a kerb and tile visual grabbing control system. A kerb and tile visual grabbing control system comprises a visual identification module, a system control module and a six-axis mechanical arm module, the six-axis mechanical arm module comprises a mechanical arm main body and an auxiliary control assembly, the mechanical arm main body is used for grabbing and laying kerbs and tiles, and the auxiliary control assembly is used for controlling the mechanical arm main body. The mechanical arm body comprises a supporting arm, a lifting arm, a swing arm and a mechanical claw which are sequentially and rotationally connected, and the auxiliary control assembly is connected between the front end of the supporting arm and the front end of the swing arm and used for supporting the mechanical arm body and reducing the equipment load. According to the mechanical arm, the torque generated to the front end of the swing arm when the mechanical claw grabs a heavy object can be effectively shared, the load of each joint motor is greatly reduced, and therefore the structural rigidity and the movement stability of the whole mechanical arm under the heavy-load and large-arm-span working conditions are enhanced, and the precision and stability of the laying action are ensured.

The invention belongs to the technical field of buildings, and relates to a building structure with the component size determined according to the structural stress magnitude, the building structure comprises a supporting column (1) and a cross beam (2) connected with the supporting column (1), the cross beam (2) is a fish-belly sill, the cross section of the fish-belly sill is in a fish-belly form, the middle cross section size is large, the cross section sizes of the two ends are small, the supporting column (1) is a fusiform column, and the cross section of the cross beam (2) is a triangular column. The middle section size of the fusiform column is large, and the section sizes of the two ends are small. While the requirement for building attractiveness is met, the sizes of all structural components are set according to the stress of the structure, the area of the beam is increased at the position where the stress of the beam is maximum, the structural rigidity and the stress performance are improved, the height of the beam is reduced at the position where the stress of the beam is small, the effect of reducing cost can be achieved, and a structural system combining architectural aesthetics and structural stress is formed.

This invention provides a method for analyzing assembly deviations in ultra-large structures with non-uniform stiffness condensation, comprising the following steps: S1: dividing the ultra-large structure into a plastic region and an ultra-large stiffened elastic region; S2: constructing a model for the non-uniform stiffness condensation of ultra-large structures suitable for the network-like concentrated distribution characteristics of assembly deviations; S3: establishing an overall stiffness model of the ultra-large structure described by the weld region and its interface; S4: considering the influence of welding deformation during the welding process, introducing a welding stress field, and establishing a welding deviation analysis model based on the deformation coordination relationship before and after assembly in the plastic region; solving for the welding deviations of the ultra-large structure, thereby realizing the prediction and analysis of assembly deviations in ultra-large stiffened structures. This invention's method for analyzing assembly deviations in ultra-large structures with non-uniform stiffness condensation enables the prediction and analysis of assembly deviations in ultra-large structures with overall flexibility and local rigidity, providing a theoretical basis for compensation and control of assembly deviations in ultra-large structures, and improving product assembly quality.

The invention discloses an R-test-based measuring device in a small five-axis machine tool space error measuring system. The R-test-based measuring device comprises a cutter handle, a shell and a central mounting frame, wherein the central mounting frame is an I-shaped cylindrical component and is divided into a front section, a middle section and a rear section; the front section of the central mounting frame is a mounting part of a sensor; the middle section of the central mounting frame is a connecting column; the rear section of the central mounting frame is a connecting end of the cutter handle; the shell is assembled from the rear section to the front section of the center mounting frame and wraps the center mounting frame. By designing an integrated overall structure (a non-contact measurement system with an I-shaped center frame as a core), the problems that an existing R-test device is difficult to flexibly adapt to automatic tool changing of a small five-axis machine tool, the structural rigidity is insufficient, and the measurement range is small are solved, high integration level, high rigidity and in-situ measurement characteristics of the device are achieved, and the measurement accuracy is improved. And the measurement sensitivity, the measurement stability and the measurement space size are improved through the optimization of the installation poses of the sensors.