198 results about "Stress level" patented technology

The invention belongs to the technical field of bridge engineering, and aims to eliminate the problem of systematic underestimation of web bearing capacity under the condition of standard effective loading length. The invention provides a method for correcting a local pressure bearing capacity calculation formula of a steel beam web, which comprises the following steps of: identifying and determining a key parameter ratio and an engineering application range thereof by carrying out sensitivity parameter analysis on a bending reduction coefficient; on the basis of the reference engineering case, fixed values are taken from part of parameters, and other geometric quantities are inversely calculated; based on a preset variable sequence, finite element models are established in Abaqus in batches, and the ultimate bearing capacity and the flange longitudinal stress level of each model are extracted; the standard calculation value is corrected according to a finite element result, the corrected ultimate bearing capacity of the steel beam web is calculated, and a corrected bending reduction coefficient is obtained accordingly; and finally, fitting a corrected formula about the regularized slenderness ratio on the correction coefficient by taking the specification parameter as an independent variable to obtain an expression capable of directly replacing the original specification. The method can significantly improve the calculation precision.

The invention provides a reservoir mechanical integrity evaluation method under high-frequency injection and production. The evaluation method comprises the steps that S1, rock sample compressive strength and mechanical property parameters of a reservoir under multiple confining pressures are determined; s2, determining the upper limit and the lower limit of the reservoir pressure of the energy storage reservoir in the injection-production process; s3, obtaining the critical fatigue strength of the reservoir rock sample under a plurality of confining pressures within the designed age limit; s4, determining a deviating stress-average stress plane according to the compressive strength and the critical fatigue strength of the rock sample under the plurality of confining pressures, and dividing rock failure zones on the deviating stress-average stress plane; and S5, establishing a geomechanical model to predict the stress level of the reservoir, and judging the safety of the reservoir during the cyclic injection-production period from the perspective of mechanical integrity. Safe, efficient, economical and lasting operation of the energy storage warehouse is guaranteed, and a feasible method is provided for expanding the application range of compressed air energy storage.

The invention discloses a ship mechanical and electrical product accelerated life test stress profile generation method and device, a medium and a product, and relates to the field of ship reliability engineering and test.The method comprises the steps that working condition profile data and marine environment stress data of a target ship mechanical and electrical product under a typical navigation task are obtained, and a working condition-environment mapping model is established; according to the designed life target of the target ship mechanical and electrical product, the whole life cycle total damage to the target ship mechanical and electrical product is determined by using the working condition-environment mapping model and the failure physical damage model, an accelerated stress profile is generated by strengthening the stress level with damage equivalence as the principle, an accelerated factor is calculated, and an accelerated life test is performed; and failure data of the failure event is recorded, parameters of the failure physical damage model are calibrated, and the accelerated stress profile is iteratively optimized by using the calibrated failure physical damage model. Accurate and dynamic generation of the accelerated life test stress profile of the ship mechanical and electrical product is realized.

The utility model relates to the technical field of pile foundation construction, in particular to a grading-free integrated drill bit which comprises a mounting shaft, an outer cylinder, a middle cylinder and a righting drill bit are sequentially and fixedly mounted on the outer surface of the mounting shaft from top to bottom, and the diameters of the outer cylinder, the middle cylinder and the righting drill bit are sequentially reduced. According to the grading-free integrated drill bit, the righting drill bit with the small diameter at the front end is firstly used for drilling, loosening the circumference of a rock core in a hole and increasing the free surface of a rock stratum so as to reduce the stress level of the righting drill bit, further drilling of a large-diameter barrel drill is facilitated, the working efficiency of the large-diameter barrel drill is improved, and meanwhile a free surface for rock mass breaking is manufactured for the righting drill bit for middle barrel drilling; the cone on the middle cylinder forms a rock mass crushing free surface for the outer cylinder, and the drill bit sequentially utilizes more than two drill bits to alternately work, so that the free surfaces can be provided mutually, the drilling efficiency is greatly improved, and the rock crushing capability is also improved.

The invention discloses an automobile part accelerated life test method and system, and the method comprises the steps: setting an extreme temperature cycle: setting a cycle of keeping a low temperature of-40 DEG C for 30 minutes and keeping a high temperature of 180 DEG C for 30 minutes, and setting a temperature change rate of 15 DEG C / min; a multi-physics field coupling test: in an extreme temperature cycle process, synchronously carrying out a resistance test, a withstand voltage test, a turn-to-turn insulation test, a vibration test, a humidity test and a salt spray test, and comprehensively evaluating the electrical, mechanical and environmental adaptability of the parts; multi-scale numerical simulation: establishing material-level, part-level and system-level coupling models, and predicting life distribution of parts; and data-driven optimization: based on historical test data and a numerical simulation result, establishing an acceleration model, dynamically adjusting a temperature cycle parameter and a stress level, and realizing maximization of test efficiency. Based on extreme temperature circulation (-40 DEG C / 30 minutes to 180 DEG C / 30 minutes) and multi-physical field coupling strengthening stress testing, the test time is shortened by 70% or above, and the evaluation error is smaller than or equal to + / -5%.

The invention relates to the field of pressing equipment, and discloses a pull rod pre-pressing type pressing mechanism and a pre-tightening force applying method thereof. The mechanism comprises a fixed plate, a movable plate, a pull rod, a pre-tightening rod, a mold locking unit and a mold moving unit, initial pressure stress is applied to the pull rod through a pre-tightening structure, the tensile stress level of the pull rod in work is reduced, and the safety is improved by combining a double-insurance mechanism of the pull rod and the pre-tightening structure. The pre-tightening force is transmitted to the pull rod through the pre-tightening rods, the pre-tightening nuts and the pre-tightening plates, and the adjacent pre-tightening rods can be combined to optimize the structure. The fatigue life of the pull rod can be remarkably prolonged, crack propagation is restrained, material consumption is reduced, cost is reduced, and meanwhile safety accidents caused by failure of a single component are avoided.

Disclosed are a method, system, and apparatus of a biometric sensor of a tactical gear to monitor health and stress of a wearer. In one embodiment, personal protective equipment includes a language translator module integrated in a tactical gear, a biometric sensor, and a responsive device integrated in the tactical gear. A wearer bi-directionally communicates with an individual in an ambient environment using any language other than a primary language spoken by the wearer when the language translator module is activated. The biometric sensor detects the health condition of the wearer. The responsive device vibrates to notify the wearer when the biometric sensor detects an elevated stress level of the wearer of the tactical gear. The biometric sensor is detachable from the tactical gear and placeable on an injured person nearby to the wearer through an armband extendable from the biometric sensor when it is removed from the tactical gear.

The invention provides a dangerous rock degradation and collapse simulation test system and method under a multi-field coupling effect, and the system comprises a flexible stress loading device which provides a vertical stress for a dangerous rock mass sample to enable the sample to have the same stress level as a natural state; a dangerous rock mass sample is used for simulating various collapse modes by controlling the angle of a soft belt and a hollowed-out area; the corrosion device is used for providing a dry-wet cycle and osmotic pressure environment for the dangerous rock mass sample; the data acquisition device is used for recording surface displacement, acoustic characteristics and external factors of the rock mass along the soft zone; the damage degree calculation device is used for calculating the damage degree of the dangerous rock mass under multi-field coupling; the safety coefficient calculation device is used for obtaining the safety coefficient of the dangerous rock mass under multi-field coupling; and the safety evaluation device is used for constructing an evaluation model and evaluating the safety state of the dangerous rock mass. According to the method, collapse simulation caused by degradation of the soft belt under the multi-field coupling effect is achieved, and the problems of early-stage safety evaluation and graded early warning of dangerous rock instability based on multi-index fusion are solved.

The invention discloses a high-performance cast cold roll evaluation method based on stress of a working layer and a bonding layer, and belongs to the technical field of metallurgical mechanical equipment design and life evaluation, and the method comprises the following steps: calculating the maximum contact pressure between a working roll and a supporting roll and the flattening width of a contact surface; further determining the maximum shear stress in the working roll and the depth position corresponding to the shear stress; according to radius changes of the working roller in different wear stages, the maximum contact pressure and the contact surface flattening width in different wear stages are calculated for multiple times, and then normal stress at the position of a bonding layer in each stage and shear stress derived from the normal stress are calculated; performing simulation verification on calculation data based on a stress field of finite element simulation; comparing the shear stress of the bonding layer obtained after calculation with the total stress level after the residual stress is considered, and the allowable shear stress of the same material; and the risk is judged. The service life of the roller can be prolonged, and the equipment loss cost of cold-rolled strip steel production is reduced.

This utility model relates to an electronic device. The electronic device according to this utility model is characterized by comprising a processor that acquires a heart rate variability signal related to the heart rate of a user sitting on the massage chair from a sensor mounted on the massage chair; the processor determines the user's stress level or parasympathetic nervous system activity based on the heart rate variability signal and the user's breathing rate; the processor determines a suitable target breathing rate for the user based on the stress level or the parasympathetic nervous system activity; and the processor controls the massage chair to induce the user to breathe at the target breathing rate. According to this utility model, the electronic device controls the massage chair based on the target breathing rate, thereby inducing the user to breathe at the determined target breathing rate.

This invention belongs to the fields of rock mechanics, geological engineering, and geophysical exploration technology. Specifically, it discloses a method and system for constructing a mapping relationship between acoustic wave velocity and surrounding rock stress. The method includes: performing uniaxial graded loading on a standard sandstone sample and simultaneously measuring the P-wave velocity and S-wave velocity under each stress level; then fitting a linear mapping relationship between the P-wave / S-wave velocity ratio and the axial stress of the surrounding rock; introducing joint correction coefficients and water content correction coefficients to optimize the linear mapping relationship and constructing an acoustoelastic model; and using the acoustoelastic model and field-measured wave velocity data to invert the stress state of the actual surrounding rock, thus completing the construction of the acoustic wave velocity-surround rock stress mapping relationship. This invention solves the problems of traditional wave velocity-stress relationships, which, when describing the nonlinear response of rocks at different stress stages, are not sensitive enough to subtle stress changes and lack a complete, high-precision, and interference-resistant stress inversion calculation method, making them difficult to directly apply to complex actual engineering environments.

The invention discloses a method for evaluating the low-temperature fatigue performance of an asphalt mixture, belongs to the technical field of road engineering, and aims to solve the technical problem of how to more accurately and comprehensively evaluate the fatigue performance of the asphalt mixture in a low-temperature environment. According to the technical scheme, the method comprises the following steps: preparing a prismoid test piece and a beam test piece made of the same asphalt mixture as the prismoid test piece; acquiring a temperature change sequence of the pavement structure in the target test environment for a plurality of continuous hours through temperature acquisition equipment; taking the collected temperature change sequence as an environment control condition, carrying out a constraint test piece temperature stress test on the prismoid test piece, and synchronously recording the axial force per hour in the test process; calculating the average temperature stress value in the test period according to the axial force per hour and the size of the prism test piece; the average temperature stress value serves as the initial stress level of the four-point bending fatigue life test and is pre-loaded on the beam test piece, and a plurality of different load stress levels are selected for testing.

This invention belongs to the technical field of information technology, specifically disclosing a method and system for AGC load allocation in hydropower stations considering vibration risk. The method includes: acquiring real-time tilt angle time-series data of the unit bearing housing and guide vane support; processing the real-time tilt angle time-series data using preset high-pass and low-pass filters; the high-pass filter output representing rapid fluctuation components changing from seconds to minutes, and the low-pass filter output representing slow drift components changing from hours to days; calculating the transient vibration impact index and the long-term structural degradation index based on the amplitude characteristics of the rapid fluctuation components and the cumulative trend of the slow drift components, respectively; the transient vibration impact index reflecting the instantaneous mechanical stress level caused by the current load adjustment; the purpose of this invention is to solve the problem in the prior art of how to simultaneously identify and weigh the transient vibration risk caused by rapid tilt angle changes and the long-term structural degradation risk caused by slow tilt angle drift in load allocation decisions.

This invention provides a novel vibration fatigue testing method for gas turbine blades. Addressing the problems of large specimen wear, long testing time, and limited results associated with traditional step-and-step stress loading methods for obtaining blade fatigue limits, this invention excites blade resonance on an electromagnetic vibration table using novel step-and-step stress loading techniques on identical blade specimens. While retaining the step-and-step matching standard, when limited test data cannot meet the matching requirements, a stress "concession" method is rationally applied based on the turbine blade structure and fatigue strength level to eliminate test data with significant stress deviations, thereby obtaining the median fatigue strength of blades from the same batch. This invention makes stress matching faster and more flexible, requiring only 2-3 stress levels to achieve a test fitting result with a confidence level of over 95%, demonstrating high accuracy. This method is applicable to fatigue limit tests of all gas turbine blades.

The invention discloses a titanium alloy component stress relief annealing effect evaluation method and device, a medium and equipment, and relates to the technical field of part heat treatment. According to the method, the two samples with the arc sections are adopted for evaluation, stress relief annealing treatment is carried out on the blocky sample firstly, typical structural characteristics of an actual target part are effectively simulated while testing is facilitated, then the stress relief annealing process is optimized by comparing test results, and the method is suitable for actual engineering application and has good application prospects. The optimized process is used for conducting stress relief annealing treatment on the flat plate fatigue sample, the typical structural characteristics of an actual target part are simulated, the machining process and process parameters of the actual part are also simulated, and finally the stress relief annealing effect is evaluated through fatigue tests under different stress level conditions. The fatigue life design requirement is met to a greater extent, and the stress relief annealing effect is evaluated based on the fatigue life.

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass; by making the tensile stress linear density value of the chemically strengthened microcrystalline glass and the ratio of the stress integral of the tensile stress layer close to the middle position to the thickness t satisfy a specific difference relationship, the internal stress distribution of the chemically strengthened microcrystalline glass can be ensured to be safer under the condition that the chemically strengthened microcrystalline glass has a relatively high overall stress level, so that the chemically strengthened microcrystalline glass can be kept in a safe stress state.

The application discloses a kind of asphalt mixture fatigue life prediction methods, comprising the following steps: S1, making the standard test piece of asphalt mixture;S2, the three-point bending fatigue test of asphalt mixture under different stress levels is carried out to the standard test piece made under the setting parameter;S3, according to the stress-strain hysteresis curve of asphalt mixture is fitted to test data;S4, the accuracy of the stress-strain hysteresis curve obtained is verified;S5, based on the hysteresis curve, the fatigue damage variable of asphalt mixture is constructed;S6, the fatigue life prediction model of asphalt mixture is constructed.The method of the application avoids the defect that the relative change rate of dissipation energy is the discrete index data of prediction fatigue life, so as to improve the prediction accuracy of asphalt mixture fatigue life, the model construction step is less, form is simple, and has higher practical value.

The invention discloses a zero-stress test block model obtaining method and device, a medium and equipment, and relates to the technical field of nondestructive detection.The method comprises the steps that ultrasonic measurement is conducted on a solid test block under different stress levels, ultrasonic propagation signals are collected, training data are formed according to corresponding residual stress, and a stress prediction model is constructed; the model can correspondingly output the characteristics of the ultrasonic propagation signal according to the input stress value, finally, zero stress is used as input, the characteristics of the ultrasonic propagation signal under the stress level are output, the zero-stress test block model without the solid test block is constructed, the tedious process of solid test block preparation can be avoided, and the production efficiency is improved. In the subsequent detection, comparison can be completed only by calling corresponding electronic test block data, the detection efficiency is improved, the electronic test block restores the zero stress state as far as possible through the neural network model, the detection error introduced by solid test block preparation is avoided, the detection precision is improved, and the effect of ultrasonic residual stress measurement is improved.

The application discloses a test piece design method for reflecting the weld load characteristics of a Ti2AlNb alloy electron beam welded combustion chamber case, and belongs to the technical field of test piece design reflecting load characteristics. The method comprises the following steps: determining model geometric shape parameters according to test piece size limit conditions and test piece size stress level limit conditions, and then building a test piece model and a pin model by using Abaqus; applying displacement load on the pin model, and applying contact control on the contact surface between the pin model and the pin hole, so as to solve the parallel section stress of the test piece model, the maximum stress at the pin hole and the maximum stress of the circular arc transition section, and then obtain the stress reserve coefficient of the pin hole and the stress concentration coefficient of the circular arc transition section; when the stress reserve coefficient of the pin hole and the stress concentration coefficient of the circular arc transition section meet the test piece size stress level limit conditions, a test piece is manufactured according to the model geometric shape parameters, and a weld is arranged on the test piece.

The invention provides a ballastless track concrete dynamic fatigue life prediction method and system, and relates to the technical field of high speed railway ballastless track performance evaluation.The method comprises the steps that a load spectrum of a ballastless track is obtained, and the load spectrum comprises a train dynamic load spectrum and an environment temperature change spectrum; based on the load spectrum, a fatigue stress spectrum of the track slab is calculated through a track fatigue stress calculation model, and the fatigue stress spectrum comprises a stress amplitude, a stress base value and an action frequency; dividing stress grades according to the fatigue stress spectrum, determining stress parameters of each grade in combination with concrete tension and compression characteristics, and calling a corrected fatigue life equation to calculate the fatigue life under the current stress grade; based on the fatigue life, a damage variable increment is calculated through a nonlinear damage accumulation criterion, and a total damage variable is obtained through accumulation; and judging a fatigue failure state according to the total damage variable, and if the fatigue failure state does not occur, updating material parameters and carrying out iterative calculation until the fatigue failure is judged.

The application discloses a kind of based on initial modulus index asphalt mixture fatigue life prediction method, the present application includes the following steps: S1, the standard test piece of asphalt mixture is made;S2, the three-point bending fatigue test of asphalt mixture under different stress levels is carried out to the standard test piece made under setting parameter;S3, according to test data fitting asphalt mixture stress strain hysteresis curve;S4, based on the stress strain hysteresis curve obtains the initial modulus and failure modulus of asphalt mixture;S5, based on the initial modulus and failure modulus described above constructs the fatigue damage factor model of asphalt mixture based on initial modulus;S6, based on the fatigue damage factor model constructed predicts the fatigue life of asphalt mixture in use.The present application is more reasonable by introducing failure modulus and constructing damage factor model, so that the residual life of asphalt mixture can be more accurately and quickly predicted.

The application discloses a kind of crew workload self-adaptive prediction methods based on multi-source heterogeneous data fusion, the method includes: the physiological characteristic data of crew is collected to obtain the current physiological load of the individual;Based on the current physiological load of individual and the physiological load parameter of historical time, the individual physiological load prediction value of next time period is obtained;Obtain the navigation environment data of the ship where the crew is in next time period, and obtain the comprehensive stress level of the navigation environment where the crew is in next time period;Based on the comprehensive stress level of the navigation environment where the crew is in next time period and the individual physiological load prediction value of the next time period, input causal reasoning graph model, predict the workload level of crew.The application comprehensively, multidimensionally reflects the working state of crew by collecting and fusing the physiological characteristic data of crew, historical physiological load parameter and navigation environment data, improves the information quantity and comprehensive analysis ability of prediction model.

An incentive providing system capable of letting a user behave in such a way that his / her stress level is lowered and thus reducing his / her stress is provided. The incentive providing system according to the present disclosure executes: processing for acquiring a stress level indicating a degree of stress of a user; and providing an incentive for a user in a case in which the stress level of the user is lower than a predetermined standard.

An impact wrench comprising a control unit. The control unit is configured to receive a number of connectors and, for each connector of a plurality of connectors corresponding to the number of connectors, to determine a torque for the connector based on the number of connectors, wherein, if the connector is a connector other than a finally tightened connector, the specified torque is assigned to a stress level higher than a desired stress level, and the connector is tightened using the torque specified for the connector.

The invention discloses an optimization method, device and equipment of a biodegradable bone fracture plate and a storage medium, and is applied to the technical field of medical instruments, and the method comprises the following steps: constructing a finite element model of femoral shaft fracture; in the finite element model, applying a dynamic biomechanical load simulating a human body walking cycle; the stress level of the bone fracture plate and the displacement level of the fixed thighbone are used as optimization targets, and multi-dimensional parameters of the bone fracture plate are optimized; delimiting a safety area of the bone fracture plate according to the optimized bone fracture plate design parameters; according to the method, the technical steps of base material type selection and process optimization, finite element model construction and dynamic load application, multi-dimensional parameter optimization, safety area demarcation and personalized adaptation and the like are organically combined; the technical problems of secondary operation, stress shielding, high biological safety risk, poor adaptability, high engineering difficulty and the like of a traditional bone fracture plate are effectively solved.

The invention belongs to the field of engine design, and particularly relates to an aero-engine whole machine dynamic structure design parameter optimization method, which utilizes an APDL language of ANSYS software to carry out parametric modeling on an aero-engine whole machine (including a rotor, a support and a stator casing), and applies additional centrifugal force and additional gyroscopic moment generated by maneuvering flight. The stress level of the bearing case, the strain energy distribution of a rotor system and the rotor and stator gap change are obtained through bearing case stress analysis, critical speed analysis and unbalanced response analysis. Based on the analysis results, multi-objective optimization is carried out on complete machine dynamic design parameters, so that the stress level of a force bearing casing is lowest, rotor strain energy distribution meets rotor dynamic design requirements, rotor and stator gap changes are minimum, the rub-impact risk is reduced, optimization of the structural design parameters is completed through software, the design efficiency is improved, and the design cost is reduced. The design period is shortened.

A method 600 and system 200 for assessing a stress level of a user during a driving session is disclosed A processor 502 receives physiological data of the user from one or more biometric sensors 316 embedded in a wearable ring 202. Vehicular data associated with the driving session is received from a vehicular API 410 embedded in a vehicle computing device 204. The physiological data is correlated with the vehicular data on time-synchronized timestamps to identify one or more stress-inducing driving conditions. A stress score is computed for the user during the driving session based on a comparison of the physiological data with one or more baseline physiological measurements of the user obtained during non-driving periods. The stress score normalized on a predetermined scale is displayed via a user interface 504. The stress score is displayed in association with the one or more identified stress-inducing conditions.

The application discloses a kind of simulation device and loading method for deep buried roadway slotting blasting in the technical field of experimental equipment, including double-shaft loading unit and the rock mass simulation test piece being arranged in the double-shaft loading equipment;First, make roadway experimental model, use electric blasting comprehensive experimental system to carry out blasting on the model, study the rock breaking mechanism of slotting hole blasting under different stress levels, the movement characteristics of post-blasting rock mass, dynamic strain evolution process and post-blasting effect analysis.This application mainly studies deep high-stress roadway, independently selects stress similarity constant and geometric similarity constant according to similarity experiment law, arranges blasting borehole and network according to on-site blasting live, which can realize comprehensive and real simulation of on-site slotting blasting process.Provides reliable experimental method and result for mine roadway slotting blasting mechanism research, which can provide guidance for on-site slotting blasting optimization.

In the present disclosure, an electronic device may comprise: at least one sensor; a memory including one or more storage media storing instructions; and at least one processor including a processing circuit. The instructions may, when individually or collectively executed by the at least one processor, cause the electronic device to perform at least one operation. The at least one operation may comprise an operation of acquiring a biometric signal by using the at least one sensor. The at least one operation may comprise an operation of identifying a stress level at least partially on the basis of the acquired biometric signal. The at least one operation may comprise an operation of determining a conversation topic at least partially on the basis of the identified stress level satisfying a specific stress range. The at least one operation may comprise an operation of outputting a plurality of messages corresponding to the determined conversation topic as at least a part of an interactive conversation with a user through a specific application.

The utility model provides a flange used for a bell jar standing cavity and the bell jar standing cavity, and the flange used for the bell jar standing cavity comprises an annular flange main body and an external connection part used for being connected with an external base, the external connecting part is arranged on the outer side wall of the flange main body; an annular butt joint groove used for being in butt joint with a bell jar standing cavity is formed in the upper end of the inner side wall of the flange body, and the bottom wall of the annular butt joint groove is connected with the inner side wall of the flange body through a first inclined face. The first inclined face is used for being matched with the bottom end face of the bell jar standing cavity to form a first groove used for welding when the bell jar standing cavity is embedded in the annular butt joint groove. According to the utility model, the effective length of the weld joint at the joint of the flange and the bell jar standing cavity is increased, so that the stress level of the weld joint in unit length is effectively reduced, the connection stability between the flange and the bell jar standing cavity is enhanced, and the overall rigidity of a final product is improved.