180 results about "Strain response" patented technology

The invention relates to the technical field of material fatigue performance testing, in particular to a fatigue acceleration detection method and system for a high-fatigue-resistance cast wheel, and the method comprises the steps: generating a dynamic load spectrum containing a multi-axis combined load according to the actual operation condition of a target cast wheel; applying a dynamic load spectrum to the target casting wheel to perform an acceleration test, and monitoring dynamic strain responses on the surface and inside of the target casting wheel in real time based on the distributed sensing array; establishing a damage accumulation calculation model by taking a loading parameter of the dynamic load spectrum as an additional correlation condition, and calculating an equivalent fatigue damage accumulation value based on the dynamic strain response; when the equivalent fatigue damage accumulated value reaches a preset damage threshold value, it is judged that the target cast wheel reaches the fatigue life end point, and the damage evolution rule in the acceleration test is kept consistent with the damage mechanism of the actual operation working condition. According to the invention, the problems of multi-axis load simulation distortion, incomplete damage monitoring, low service life prediction precision and the like in traditional fatigue detection are effectively solved.

The invention provides a macroscopic finite element simulation analysis method and device for a sealing element considering plastic deformation, and belongs to the field of sealing element design. The method comprises the following steps: acquiring an engineering stress-strain curve of a plastic material in a compression state; converting the engineering stress-strain curve into a real stress-strain curve; determining a yield limit, and taking a strain point corresponding to the yield limit as a demarcation point of elasticity and plastic deformation; an elastic section of a real stress-strain curve is extracted, the elastic modulus is calculated, and the Poisson's ratio is obtained through axial and transverse strain measurement in a uniaxial compression test; a true stress-strain curve plastic section is extracted, and a multi-linear isotropic hardening model is established; constructing a complete elastic-plastic constitutive model covering the elastic deformation area and the plastic deformation area; the stress distribution, the strain response and the contact performance of the plastic sealing element in a compression deformation state are simulated. According to the method and the device provided by the invention, the problem that the result does not conform to the reality due to the fact that only elastic modulus and Poisson's ratio are used in existing sealing element simulation can be solved.

The invention relates to the technical field of special-shaped pipe gallery manufacturing, and discloses a special-shaped prefabricated pipe gallery component forming method based on BIM parameter optimization. The method comprises the following steps: receiving initial BIM model data, extracting geometric topology features and material attribute features, and generating multi-dimensional feature vectors; performing structural characteristic classification on the component according to the vector, and dividing the component into a static characteristic component and a dynamic characteristic component according to a strain response threshold value when the component is stressed; when it is detected that parameter conflicts exist in the two types of components, an optimization constraint condition set containing conflicting parameters is constructed, and a multi-target parameter optimization path is generated; and performing iterative simulation on the initial BIM model data according to the path, and outputting optimized BIM model parameters meeting a preset forming standard. According to the method, through multi-dimensional feature integration, accurate classification and multi-target parameter optimization, dynamic coordination of parameters of the special-shaped prefabricated pipe gallery component is achieved, the consistency of component design and forming is improved, and the method is suitable for production of the special-shaped prefabricated pipe gallery component in a complex engineering environment.

The invention provides an in-situ real-time monitoring method and system for a rock microscopic fracture mechanism and stress evolution. The method comprises the following steps: S1, standardized preparation and pretreatment of a rock sample; s2, in-situ loading and multi-modal data synchronous acquisition are carried out; s3, crack dynamic tracking and stress-strain field joint calculation; s4, constructing a microscopic-macroscopic quantitative correlation and damage model; and S5, performing multi-dimensional dynamic visualization and engineering output. The in-situ scanning electron microscope and the mechanical loading device are integrated, so that cross-scale synchronous monitoring and quantitative analysis of micro crack evolution and macroscopic stress-strain response are realized. A low-disturbance clamping device and a conductive anti-charge sample are treated, and in-situ testing is ensured; combining DIC and deep learning to quantify a crack propagation path, a local strain field and energy characteristics; through DIC strain inversion and finite element calculation, a non-contact stress cloud picture is generated in real time, and finally quantitative correlation between a microscopic fracture mechanism and macromechanical response is established.

The invention belongs to the technical field of converter transformers, and particularly discloses a converter transformer vibration noise control method and system, a terminal and a medium, and the method comprises the steps: constructing a converter transformer structure geometric model, setting material attributes, and carrying out the grid division; based on the geometric model, establishing an electromagnetic field simulation model, applying excitation conditions, obtaining electromagnetic field distribution, establishing an iron core magnetostriction mathematical model, calculating vibration acceleration caused by magnetostriction and transient electromagnetic force of an iron core and a winding, and solving and extracting a displacement field and stress-strain response; establishing an acoustic coupling model on the basis of a structure vibration result, and calculating sound pressure level distribution under different frequencies by setting a structure-air coupling boundary and a matching layer; according to an acoustic simulation result, an iron core positioning structure and an oil tank reinforcing rib arrangement mode are optimized, vibration noise prediction and control of the converter transformer in a multi-harmonic excitation environment are realized, and equipment structure stability, operation reliability and environment adaptability are improved.

The invention relates to the technical field of spring measurement, and discloses a spring fatigue life test system and a dynamic balance evaluation method, and the system comprises a reference length acquisition module, a dynamic balance state determination module, a working condition spectrum loading module, a stress-strain response data acquisition module, a damage feature extraction module and a life evaluation module. Acquiring a reference length in a free state; step increasing preload is applied, and when it is detected that the deformation rate of the to-be-detected spring is smaller than a set threshold value, it is judged that the to-be-detected spring reaches a dynamic balance state; in a dynamic balance state, loading the to-be-tested spring based on the variable amplitude load time sequence signal, and synchronously acquiring stress-strain response data; identifying the stress characteristics of the to-be-tested spring in the load period; generating a life evaluation report based on the stress characteristics; the accuracy of the fatigue life of the spring can be improved.

The invention relates to the technical field of submarine cable engineering equipment, and discloses a submarine cable bending limiter failure analysis method and system, and the method comprises the steps: constructing a large-scale wave water tank experiment system; a wave flow test is carried out in a large-scale wave water tank experiment system, and three-dimensional terrain evolution data of a scouring pit formed at the single-pile foundation model and dynamic strain response and displacement of the submarine cable bending limiter model are obtained; constructing a hydrodynamic force-sediment transportation-submarine cable motion coupling numerical model according to the three-dimensional terrain evolution data, the dynamic strain response and the displacement; and according to the hydrodynamic force-sediment transportation-submarine cable motion coupling numerical model and different hydrodynamic force conditions, the quantitative relation between the scour range extension and the failure threshold value of the submarine cable bending limiter is determined. According to the scheme, the tensile stress and bending response change rule of the submarine cable and the bending limiter can be quantitatively analyzed, and reference is provided for optimal design and protection of the offshore wind power pile foundation submarine cable bending limiter.

The invention relates to the technical field of arc shaped energy-gathered blasting parameter design, and provides an arc shaped energy-gathered blasting parameter design method under a complex crustal stress condition, which comprises the following steps: establishing a double-hole blasting three-dimensional model comprising a rock mass, an arc explosive, an energy-gathered pipe and coupled air, applying a crustal stress boundary condition and carrying out stress initialization; setting material model parameters based on the test data; performing fluid-structure interaction dynamic response numerical simulation on the model by adopting LS-DYNA to obtain stress and strain response caused by blasting; and establishing evaluation indexes based on tensile stress, compressive stress and through crack formation, carrying out sensitivity analysis and optimization adjustment on key blasting parameters such as blast hole spacing, delayed detonation time, explosive loading amount and coupling coefficient, and finally determining an optimal blasting parameter combination in different stress states. The method can effectively meet the blasting operation requirement under the complex ground stress condition, the presplitting quality and the rock mass stability are remarkably improved, and the method has wide engineering application prospects.

The invention discloses a six-dimensional force sensor dynamic decoupling and coupling processing method, and relates to the technical field of mechanical measurement sensing detection, and the method comprises the steps: building a dynamic decoupling relation of six-dimensional mechanical component and elastomer strain response coupling mapping based on an original voltage signal and a static calibration parameter of a six-dimensional force sensor; dynamically modulating the mechanical compensation factor of the dynamic decoupling relation through the environmental influence factor; according to the modulated mechanical compensation factor, performing real-time suppression and compensation on coupling deviation caused by environmental disturbance, and outputting a six-dimensional mechanical component subjected to environmental compensation; performing high-precision decoupling processing on the six-dimensional mechanical component subjected to environment compensation to generate a corrected six-dimensional mechanical component; performing closed-loop online updating on the mechanical compensation factor of the dynamic decoupling relation by using the corrected six-dimensional mechanical component; according to the invention, the coupling deviation caused by environmental disturbance is suppressed and compensated in real time, and the defects of the six-dimensional force sensor in the aspects of decoupling precision and measurement stability are improved.

The invention discloses a method for predicting mechanical properties of ultra-high performance concrete, particularly relates to the technical field of dynamic property analysis of building materials, and aims to solve the problem that sudden brittle failure of materials cannot be accurately predicted under impact and explosion loads in the conventional method. The method comprises the following steps: calculating a macroscopic stress-strain response based on a continuum mechanical equation by acquiring a material ratio parameter and a dynamic load condition; constructing topological features through the strain energy entropy change rate to locate a damage area; determining an interface debonding energy threshold value and a crack growth rate of the damaged area in combination with interface fracture mechanics; utilizing the law of conservation of energy to establish dynamic correlation between interface debonding energy and strain energy density; when the crack growth rate exceeds an interface debonding energy threshold value, correcting macroscopic response data of a sudden stress drop interval based on the dynamic association relationship; the cross-scale coupling of a microscopic damage mechanism and a macroscopic mechanical behavior is realized, and the prediction precision under a dynamic load is remarkably improved.

A gas cylinder having a structural health self-sensing monitoring function, a manufacturing method therefor, and a gas cylinder system. The gas cylinder comprises a liner, a carbon fiber winding layer, a glass fiber insulating layer, an intelligent sensing layer and a glass fiber protective layer being successively stacked on the outer surface of the liner. The carbon fiber winding layer contains carbon fibers and cured resin I; the glass fiber insulating layer contains glass fibers I and cured resin II; the intelligent sensing layer contains glass fiber bundles, cured epoxy resin and few-layer graphene dispersed in the cured epoxy resin; the glass fiber protective layer contains glass fibers II and cured resin III. While the strength and airtightness of the winding layer of the gas cylinder can be improved, by means of the resistance / strain response effect of the winding layer and electrical resistance tomography, in-situ, online and full-lifetime structural health self-sensing monitoring of the gas cylinder can be implemented without disassembling the gas cylinder, thereby achieving real-time structural sensing and damage monitoring and location of the gas cylinder.

The invention provides a thermoelectric device analysis method considering the variable-temperature elastic-plastic mechanical property of a thermoelectric material, and the method comprises the steps: firstly obtaining a real variable-temperature mechanical property curve of the thermoelectric material in a set temperature range through a performance experiment test, and carrying out the fitting to obtain a variable-temperature damage model of the thermoelectric material; then establishing a thermoelectric device model in finite element software, and defining material attributes of each component; carrying out bearing performance simulation on the hot arm component to obtain a stress-strain response simulation curve; comparing the stress-strain response simulation curve with the real variable-temperature mechanical property curve, and judging whether the finite element simulation process is accurate or not; thermal field boundary conditions and load boundary conditions of all components of the thermoelectric device are set, design parameters are adjusted, the bearing performance and damage of the adjusted thermoelectric device are analyzed, and the thermoelectric device configuration with the optimal performance is selected. According to the method, the real mechanical response of the thermoelectric material in a high-temperature and high-load service environment is considered, and the structure optimization design of the thermoelectric device is realized.

The invention provides a bridge monitoring method and system based on dynamic bridge grains. The method comprises the following steps: acquiring full-bridge dynamic strain response of a bridge under vehicle load excitation based on a grating array sensing network in the bridge; constructing a dynamic bridge grain based on the full-bridge dynamic strain response; the dynamic bridge pattern is a strain change curve which changes along the mileage position of the bridge and represents the mutual stress relation of the structure; and determining whether the bridge has abnormal traffic flow, heavy vehicles, sudden accidental impact and diseases or not based on the dynamic bridge grains. According to the method, the dynamic bridge grain representing the structural characteristics of the bridge is constructed by using the strain data of the whole domain of the bridge, the overall structural characteristics of the bridge are considered, the relevance between the dynamic bridge grain and the bridge state is improved, and then the purpose of accurately monitoring the bridge state based on the dynamic bridge grain can be achieved; and the comprehensiveness, the accuracy and the real-time performance of bridge monitoring are improved.

The invention relates to a fatigue life prediction method and system for a common threaded connection pair bolt, and belongs to the technical field of fatigue life prediction. The method comprises the following steps that a prediction result for predicting the fatigue life of the bolt is obtained by combining a correction fitting relational expression of the total strain amplitude and the fatigue life of the common threaded connection pair bolt with a fatigue load spectrum and a fatigue cumulative damage rule. According to the method, a fitting relational expression of total strain amplitude and stress amplitude, a hysteresis loop curve expression and a modified Neuber hyperbolic expression are combined to obtain local stress-strain response in combination with a fatigue load spectrum and a fatigue notch coefficient at the root of the bolt; the fitting relational expression of the total strain amplitude and the fatigue life is corrected through the Morrow average stress solved through the local stress strain response to obtain a corrected fitting relational expression, and the corrected fitting relational expression is combined with a fatigue load spectrum and a fatigue accumulated damage rule to achieve high-precision prediction of the fatigue life of the bolt of the common threaded connection pair.

The invention provides an underwater vehicle measuring point layout optimization method and system, and belongs to the technical field of experimental measuring point layout optimization. Comprising the following steps: obtaining simulation data of an underwater vehicle structure through finite element simulation, and extracting strain data of a unit capable of arranging a strain gauge area according to actual engineering constraints; centroid coordinates of the units, sensitivity values of strain response values relative to working conditions and strain gradients are calculated by taking centroids of the units in the areas where the strain gauges can be arranged as nodes; mapping the strain response values of all the nodes to a unified interval to obtain a normalized strain response value; obtaining sensitivity coverage and strain gradient coverage, and calculating space coverage of all nodes; integrating the normalized strain response value, sensitivity coverage, strain gradient coverage and space coverage as optimization indexes, and performing optimization by adopting an improved discrete artificial bee colony algorithm; and a final layout scheme is decided by outputting the relationship between the number of the measuring points and the information amount.

The embodiment of the invention relates to the technical field of energy absorption metamaterial structures, and discloses a mixed lattice lattice metamaterial structure which comprises a plurality of lattice structure unit cells which are sequentially arranged in the X direction, the Y direction and the Z direction to form a lattice metamaterial unit. Each lattice structure unit cell comprises a cubic truss, a transition rod and a supporting column, and the two ends of the transition rod are connected with the cubic truss and the supporting column respectively. According to the embodiment, the problem that the energy absorption capacity of a stretching dominant structure is reduced due to unstable stress-strain response in the nonlinear stage is effectively solved, and through the unique structural design, the yield resistance of the structure in the initial loading stage is enhanced, so that the structure can bear external loads more stably.

The invention belongs to the technical field of bridge health monitoring, and particularly relates to a bridge damage positioning method and system based on deep learning and strain response, and the method comprises the steps: obtaining the basic parameters, damage position and damage degree of a bridge, and obtaining the damage condition of the bridge according to the basic parameters, damage position and damage degree of the bridge; according to the bridge damage working condition, strain response data of the bridge under the load effect are calculated through finite elements; according to the strain response data, obtaining a training data set containing single-damage and multi-damage samples; training a one-dimensional convolutional neural network model containing multi-scale feature extraction and a multi-channel attention mechanism by using the training data set to obtain a damage positioning model; and accurately positioning the bridge damage by using the damage positioning model to obtain a positioning result.

The invention provides a bolt group loosening state optical fiber identification method based on strain response self-correlation characteristics. The bolt group loosening state optical fiber identification method comprises the steps of 1, designing a quasi-distributed fiber grating sensor layout scheme oriented to large-scale high-density bolt group loosening characteristic identification; 2, establishing a bolt mechanical transfer model; 3, establishing a dynamic model of the fastening structure; 4, constructing an optical fiber actual measurement strain response self-correlation characteristic function, and representing corresponding strain time sequence value correlation before and after bolt loosening; 5, proposing a strain response self-correlation change rate index, and judging whether the bolt is loosened or not and the loosening time based on the strain response self-correlation change rate index; and step 6, proposing a bolt looseness degree discrimination index based on the relative change rate of the pre-tightening force, and realizing bolt looseness degree discrimination. The method can be well suitable for monitoring the health state of the major equipment bolt group, the operation process is simple, and the method has good engineering practicability.

The invention relates to a novel method for constructing a soil constitutive model based on a stress test, which comprises the following steps of: performing the stress test on a soil sample by adopting a discrete element method, and analyzing the strain response of the soil under the action of stress increment in different directions; deriving key composition elements of the constitutive model based on the response envelope obtained by the stress test, including a yield surface, a plastic flow direction, a shear expansion coefficient and a plastic modulus; establishing a state-related constitutive model in combination with a critical state theory; and verifying the prediction capability of the constitutive model through a DEM heuristic test and a triaxial loading test. The method has the beneficial effects that the incremental behaviors of the soil body under different stress paths can be accurately captured through a stress tentative test, and the simulation precision of the model is remarkably improved.

The invention belongs to the technical field of electronic packaging board level interconnection, and particularly relates to a DIC-based surface-mounted component welding spot vibration strain non-contact test method and system. The testing method comprises the following steps: testing the amplitude of a welding spot by adopting a laser displacement sensor method through carrying out a vibration test, or carrying out calculation and analysis on the vibration amplitude of a welding spot area by establishing a finite element model; carrying out the type selection of telecentric / double telecentric lenses, and selecting the lens with the smallest field of view under the condition that the depth of field is close to the amplitude of the welding spot; further determining erection angles of a high-speed camera and a lens; speckles of the welding spots to be detected are manufactured; carrying out speckle quality evaluation by adopting DIC analysis software; assembling a three-dimensional strain test system, completing the setting of shooting parameters of a high-speed camera, and completing the calibration of the three-dimensional strain test system by adopting DIC analysis software; setting control parameters of a vibration table, carrying out a vibration test of the board-level assembly welding spot, and synchronously collecting a vibration image of the welding spot; and carrying out strain calculation on the welding spots under the vibration working condition by adopting DIC calculation and analysis software. According to the DIC-based non-contact test method and system for the vibration strain of the welding spot of the surface-mounted component, the strain response process of the surface-mounted welding spot can be accurately obtained, quantitative analysis and research on the vibration reliability of the welding spot are supported, and key data support is provided for reliability design of board-level interconnection products of the surface-mounted component.

The invention relates to a deep tunnel support design method considering rock mass dynamic damage, which comprises the following steps: acquiring and dynamically updating rock mass in-situ mechanical parameters, engineering parameters and the like of a tunnel excavation surface in a strong earthquake region, and calculating to obtain rock mass dynamic damage and strength parameters by combining a GZZ three-dimensional dynamic strength theory; the method comprises the following steps: simulating a total stress-strain response process of surrounding rock under the action of three-dimensional static-dynamic coupling disturbance in a tunnel excavation process by introducing damage parameters of a dynamic disturbance rock mass and adopting a deep tunnel excavation static-dynamic coupling three-dimensional numerical model and a dynamic three-dimensional strength criterion; a stress control method is provided from two angles of dynamic force and static force to improve the stress state of a rock mass, so that the positive analysis support design of the deep tunnel under the conditions of blasting construction, strong earthquake or rock burst and the like is realized, and active control measures are adopted to realize active control of the stability of the surrounding rock of the deep tunnel in the strong earthquake area. Compared with the prior art, the method has the advantages that reliability and scientificity of dynamic analysis and support design of the deep tunnel rock mass in the strong earthquake area are improved, and the like.

The invention discloses a turbine blade probability strength design optimization method and device, equipment, a medium and a product, and relates to the technical field of blade strength design, the method comprises the following steps: obtaining a preliminary blade geometric structure and preliminarily selecting material parameters according to strength requirements and operation load working conditions; the probability distribution of the load working condition, the geometric structure, the material parameters and the model parameters serves as input variables of finite elements, and stress-strain response is obtained; designing a similar structural member, carrying out multi-level verification on the precision of the life prediction model, calculating the total damage of the blade based on the life prediction model, obtaining the probability distribution of the total damage, and further obtaining the reliability under the design life meeting the strength requirement; and judging whether the reliability meets design requirements or not, and if not, performing optimization design by taking improvement of a reliability value as a target until the reliability meets the design requirements. The objective uncertainty in the design process can be considered, the part service life prediction precision is improved, and more accurate strength design is achieved.

The invention discloses a near-field resonance induction temperature sensor based on a microwave complementary interdigital resonator. According to the sensor, on the basis of the idea that temperature information response and temperature information generation are isolated from each other, near-field multi-resonance temperature tuning of the microwave complementary interdigital resonator based on metal thermal expansion strain response is realized by introducing a metal induction sheet, a high-temperature-resistant ceramic shell and a metal thermal branch knot; resonance characteristic parameters of the sensor are read in real time based on the vector network analyzer so as to obtain real-time temperature information. Besides, by introducing the high-temperature-resistant ceramic shell and the metal thermal branch knot, the temperature sensor is endowed with long-time stable and reliable working characteristics in a complex working condition environment, and one-way support constraint and one-way free strain displacement conduction of the metal thermal branch knot are also realized. Finally, the temperature regulation and control of the metal induction sheet in the loading state and the temperature conversion characterization of the near-field multi-resonance response of the resonator are realized. The sensor provided by the invention has the characteristics of flexible material and structure type selection customization based on actual temperature sensing requirements.

The invention relates to a fatigue life prediction method and system for an arc threaded connection pair bolt, and belongs to the technical field of fatigue life prediction. The method comprises the following steps that a prediction result for predicting the fatigue life of the bolt is obtained by combining a correction relational expression of the total strain amplitude and the fatigue life of the arc threaded connection pair bolt with a fatigue load spectrum and a fatigue cumulative damage rule. According to the method, a fitting relational expression of total strain amplitude and stress amplitude, a hysteresis loop curve expression and a modified Neuber hyperbolic expression are combined to obtain local stress-strain response in combination with a fatigue load spectrum and a fatigue notch coefficient at the root of the bolt; a size effect coefficient, a surface processing strengthening coefficient and an SWT damage parameter selected through the local stress-strain response are used for correcting an elastic line of a fitting relational expression of the total strain amplitude and the fatigue life to obtain a corrected relational expression; the correction relation is combined with a fatigue load spectrum and a fatigue accumulated damage rule to realize high-precision prediction of the fatigue life of the bolt.

The invention relates to a large-span bridge steel box girder fatigue damage local and overall collaborative evaluation method and system. Acquiring strain responses of a reference section and a test section of the steel box girder before and during traffic service based on a dynamic load test, defining and calculating a strain ratio and a rigidity ratio of each monitoring point, and diagnosing local crack positions of the steel box girder by utilizing statistical characteristics of the strain ratios; establishing a mapping relation between the rigidity ratio and local damage such as crack length, expansion rate and tip position, and proposing a fatigue crack safety coefficient to realize collaborative quantitative characterization of local damage and overall safety; and constructing a genetic algorithm to optimize a support vector machine model, and developing a real-time evaluation system which takes the real bridge strain response as input and takes the local crack damage type and the overall safety level of the steel box girder as output. The defect that local damage diagnosis and overall performance evaluation of the steel box girder are mutually separated in a traditional method is overcome, and real-time diagnosis and safety evaluation of fatigue damage of the large-span bridge can be synchronously achieved.

The invention discloses a local damage identification method for a 32-meter simply-supported box girder, and relates to the technical field of bridge health monitoring. The method comprises the following steps: establishing a train-rail-bridge multi-body dynamic model, extracting strain response of each key section of a bridge as a data set for algorithm verification, dividing the key sections into different plate element components based on a plate element analysis method, converting train-induced strain signals into wavelet time-frequency diagrams through wavelet transform, and calculating the train-rail-bridge multi-body dynamic model. The sum of wavelet coefficients in the time-frequency graph is used as potential indexes of damage characteristics, an optimal frequency interval is selected by using a particle swarm algorithm, and the sum of the wavelet coefficients in the optimal frequency interval is not sensitive to passing vehicles under different baseline working conditions and is only sensitive to the damage size of the bridge; and the damage is identified and quantified by comparing whether the damage index exceeds the confidence boundary of the baseline working condition, so that the damage identification of different plate element components of the key section is realized.

The invention discloses a separate steel box girder cable-stayed bridge SMA + UHPC pavement layer fatigue life evaluation method, which comprises the following steps: carrying out statistical analysis on the traffic volume at the bridge location of a cable-stayed bridge to be evaluated to obtain the bridge crossing traffic volume composition of each characteristic year; classifying according to the axle number of the vehicle type and the composition of the bridge crossing traffic volume of each characteristic year, and selecting a standard fatigue vehicle based on asphalt concrete of a bridge deck pavement layer according to a fatigue equivalent damage principle; establishing a full-bridge model and a local model of the to-be-evaluated cable-stayed bridge, and determining boundary conditions of the local model; the boundary condition acts on the local model, the stress condition of a local beam section under the most unfavorable working condition is simulated, and the stress-strain response of the bridge deck pavement layer considering the whole bridge effect is analyzed; and according to a stress analysis result, evaluating the fatigue performance of the pavement layer by utilizing a linear fatigue cumulative damage theory to obtain the total damage degree of the bridge deck pavement layer. The method has the remarkable effects that the fatigue degree of the SMA + UHPC pavement layer of the steel box girder is accurately evaluated, so that guidance is formed for the design of a steel bridge deck pavement system.

The invention discloses an air turbine starter complete machine containment test platform and method. The air turbine starter complete machine containment test platform comprises a supporting assembly, a verification aluminum cylinder for judging the damage condition of wheel disc trisection fracture impact on the exterior of a starter, a safety protection assembly, a rotating speed control assembly and a high-speed photographing assembly for capturing the impact process. The super-dynamic strain response measuring assembly comprises a plurality of sets of strain gauges arranged on the periphery of the containing ring, and the strain gauges in the sets are arranged in the axial direction and the circumferential direction of the starter respectively. The vibration measurement assembly comprises acceleration sensors which are arranged in multiple groups and are perpendicular to one another in all positions of the shell; the trigger signal assembly comprises a trigger controller and a trigger line arranged on the outer wall of the containing ring, and the trigger controller is electrically connected with the high-speed camera, the super-dynamic strain response measuring assembly, the vibration measuring assembly and the high-pressure air source providing equipment and conducts trigger control on the high-speed camera, the super-dynamic strain response measuring assembly and the vibration measuring assembly. According to the invention, examination of the complete machine containing capacity of the air turbine starter is realized, and the strain of the containing ring, the vibration response of the shell and the impact load transmission in the impact process can be obtained.

The invention provides a numerical simulation method for dynamic behaviors among immiscible solution drops in shear flow, and relates to the technical field of fluid mechanics, and the dynamic behaviors among immiscible solution drops in shear flow are calculated by combining microfluidic drop generation with dynamic strain mechanics test, constructing a water-in-oil drop interfacial membrane parameter correlation model and combining measured data of interfacial membrane strain response after progressive increase stress is applied. Systematic analysis on the initial state and the critical state of the boundary membrane is realized; the stability and the performance of the liquid drops in the shear flow are effectively optimized by identifying parameters influencing the critical state of the boundary membrane and implementing an adjusting strategy; em and Ub are accurately regulated and controlled based on definite physical and chemical parameters such as interfacial agent concentration, HLB value, temperature, pH and the like, and deformation and fracture behaviors of liquid drops in shear flow are optimized; the mechanical behavior of the liquid drop can always meet the design requirement, and accurate regulation and control are realized.

The invention discloses a concrete bridge girder elastic modulus and strength evaluation method based on fiber bragg grating, and relates to the technical field of bridge nondestructive testing, the method comprises the following steps: constructing a multi-scale finite element model, simulating the wheel weight of a vehicle by concentrated force in the multi-scale finite element model to obtain a loaded vehicle parameter, determining a vehicle loading test scheme; respectively carrying out dynamic and static force loading tests on the main beam, and collecting strain response data in the dynamic and static force loading tests by using a distributed fiber grating strain sensor; performing parameter updating on the elasticity modulus of the multi-scale finite element model according to the dynamic characteristics of the bridge structure, and taking the elasticity modulus after parameter updating as a benchmark reference value for actual bridge elasticity modulus evaluation; evaluating the elastic modulus by using the datum reference value; and reversely deducing the concrete compressive strength according to the calculated elastic modulus of the concrete. According to the method, the elastic modulus and the compressive strength of the concrete bridge girder can be effectively evaluated in a lossless manner.