354 results about "Stress level" patented technology

The invention relates to a stamping die service life dynamic evaluation system and method based on multi-mode sensing. According to the system, a feature extraction module obtains stress distribution data and crack position information and inputs the data into a trained three-dimensional stress field model to obtain dynamic feature parameters of a stress concentration area under high-frequency cyclic loads; the crack prediction module judges the dynamic characteristic parameters based on a preset threshold value, and once the dynamic characteristic parameters exceed the preset threshold value, analysis is carried out according to the mapping relation between the stress level and the crack rate and the microstructure evolution rule at the same time, and a crack propagation prediction value is generated. And the service life evaluation module inputs the crack propagation prediction value into the trained health state evaluation model, and finally the service life evaluation value of the stamping die is obtained. The service life evaluation value of the stamping die under the existing working condition and the operation condition is accurately estimated, the production efficiency is effectively improved, the production cost is reduced, the potential crack risk of the die is perceived in advance, and accurate and dynamic die service life evaluation is achieved.

The invention discloses a soft rock geological cavern tunneling construction method, belongs to the technical field of underground engineering tunnel construction, and aims to solve the safety risk problem caused by high surrounding rock deformation rate, insufficient supporting structure stability and dynamic adjustment lag in the tunnel construction process under the soft rock geological condition. According to the method, an upper pilot tunnel area, a middle pilot tunnel area and a lower pilot tunnel area are divided in the axial direction of a tunnel and excavated step by step, multiple layers of steel arches are sequentially installed, prestressed anchor rods are constructed, a real-time stress monitoring and early warning system is combined, the supporting force of adjustable hydraulic supporting rods is dynamically adjusted, and the deformation rate and the stress level of surrounding rock are controlled. According to the technical scheme, the method is characterized by comprising partition and layering excavation, steel arch and anchor rod collaborative supporting, stress monitoring point arrangement and a dynamic compensation mechanism. The method is mainly used for safe and efficient tunneling of the soft rock geological tunnel, the surrounding rock stability and the construction safety are remarkably improved through refined construction control and real-time feedback adjustment, and the method is suitable for tunnel engineering construction under the complex geological condition.

The invention relates to the technical field of livestock breeding, in particular to an intelligent feed optimal proportioning method based on pig herd nutrition analysis, which comprises the following steps: S1, collecting stress index data of a pig herd; s2, analyzing the stress level and the stress source of the swinery; s3, dynamically adjusting nutritional requirement parameters according to the stress level and the stress source, and determining nutrients needing to be adjusted under different stress conditions; s4, making corresponding stress mitigation measures based on the stress source and the stress intensity; s5, generating an optimal feed formula meeting the nutritional requirements of the swinery under the stress condition; and S6, converting the optimal feed formula into a production instruction, and sending the production instruction to feed production equipment. By dynamically adjusting the nutritional requirements of the swinery under different stress conditions and combining intelligent feed production equipment, precise feed formula optimization and efficient production are achieved, the feed utilization rate and the swinery health level are improved, and meanwhile the breeding cost is reduced.

According to one aspect of the disclosure, a method for measuring stress of a subject includes: transmitting, by a sensor, a wireless signal within an environment comprising the subject: measuring reflections of the wireless signal to generate a physiological signal responsive to changes in distance between the subject and the sensor over time: processing the physiological signal to extract feature data of the subject; and providing the feature data as input to a stress classification network to determine a stress level of the subject.

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 provides a composite material bearing structure storage life evaluation method considering an acceleration stress lower limit, and the method comprises the steps: 1, carrying out the initialization modeling: enabling the service life of a product to obey the logarithmic normal distribution, and building a three-parameter inverse power law acceleration model of the service life feature theta and the stress level S; 2, estimating parameters: estimating unknown parameters by applying a maximum likelihood estimation method for the three-parameter inverse power law acceleration model; 3, model selection: comparing the calculated likelihood function values, wherein the larger the likelihood function value is, the more stable and more accurate the model is; meanwhile, the variation coefficients of the acceleration factors are calculated in combination with test data for comparison, and the model with the small variation coefficient is more accurate; and 4, accelerated life evaluation: giving reliability, and evaluating the storage life of the three-parameter inverse power law model. The method is suitable for accelerated test evaluation of a product with a threshold effect; the three-parameter inverse power law model provided by the invention can show a better model fitting effect when the acceleration effect does not meet the linear characteristic.

The invention belongs to the technical field of rock engineering, discloses a carbonaceous slate unsteady creep model construction method based on time-stress evolution, and aims to solve the problem that creep parameters of existing carbonaceous slate cannot be accurate due to the fact that the creep parameters are regarded as constants or expressed by a nonlinear function. The unsteady creep model comprises an improved generalized Kelvin body and a Newton body with a switch, wherein the Newton body takes the stress level into consideration, and the improved generalized Kelvin body is connected with the Newton body with the switch in series. According to the method, more accurate creep parameters of the carbonaceous slate can be obtained, and a theoretical model is provided for tunnel surrounding rock creep deformation research and tunnel long-term stability analysis of a carbonaceous slate stratum tunnel penetrating through an extremely high crustal stress area.

The invention relates to a fatigue limit rapid prediction method based on infrared thermal image energy dissipation characteristics. The method comprises the steps of sample preparation and pretreatment, fatigue loading stress level upper limit determination, infrared fatigue test and temperature rise data acquisition, thermal image data processing and temperature rise feature extraction, energy dissipation model construction, fatigue limit value prediction, error analysis and method verification. The method comprises the following steps: monitoring steady-state temperature rise rates under different stresses through a thermal infrared imager, establishing a relation curve between a dissipation rate and a stress amplitude, predicting a fatigue limit based on a least square method, and comparing the fatigue limit with an S-N test result for verification. Compared with a traditional method, the method has the advantages of high prediction precision, high response sensitivity, low loss, short test period and the like, and is particularly suitable for rapid fatigue limit prediction and strengthening effect judgment of the high-temperature alloy material subjected to laser-assisted ultrasonic rolling strengthening.

The invention belongs to the technical field of welding stress control, and discloses an inner floating disc splicing stress parameter optimization method and system. Real-time working condition information such as the construction stage, the accumulated stress level, the overall structure rigidity and field environment parameters is combined with a dynamic adjustment mechanism of a stress optimization priority set; therefore, the problem that global optimization control is difficult to realize under multi-target conflict, construction stage evolution, cumulative stress change and field environment disturbance is solved, and the effect of realizing continuous balance and global optimization control among the targets in the whole construction period is achieved.

The invention discloses a disturbance degree unified evaluation method considering soil stress and structural change, and belongs to the technical field of rock soil and underground engineering. The method comprises the following steps: calculating a soil body average effective stress used for representing a soil body stress state, and a body strain and a shear strain used for representing a soil body initial structure; calculating structural parameters for representing the initial structural property of the soil body; and substituting the calculated average effective stress, the shear strain, the body strain and the structural parameters of the soil body into a soil body disturbance degree evaluation formula, respectively calculating soil body disturbance degrees SDD under an unloading working condition and a loading working condition, and evaluating soil body disturbance caused by underground engineering construction. The method has the beneficial effects that the stress level change and the soil structure change caused by underground engineering construction are comprehensively considered, and the accuracy of disturbance degree evaluation is improved; soil disturbance can be accurately predicted before construction, and the method has important guiding significance on actual engineering deformation prediction, reinforcement scheme optimization and the like.

The present application relates to a complex variable function and model construction method for solving the stress field of rigid inclusion problems. First, for a given distal loading method and rigid inclusion shape, a corresponding conformal mapping function and distal boundary conditions are established; secondly, based on the boundary conditions of the matrix and the inclusion, a closed-form solution of the potential function that characterizes the stress field and displacement field in the matrix is ​​given with the help of the analytical properties of the potential function and the Cauchy integral; then, through the solved potential function, a numerical program for calculating the stress distribution on the interface between the matrix and the rigid inclusion is given; finally, for the stress at the corner point of the polygonal inclusion that has been obtained, an empirical formula for predicting the stress level using the curvature at the corner point is provided. It is convenient to calculate the stress distribution at the interface and analyze the influence of relevant parameters on the stress field; the research on the distribution of the stress field and the prediction of the stress level is relatively in-depth, and compared with the finite element method, it can greatly improve the calculation accuracy and speed.

Aspects of the subject disclosure may include, for example: obtaining first data that is associated with a first user and that is indicative of personality trait(s) of the first user; obtaining second data that is associated with a second user and that is indicative of personality trait(s) of the second user; receiving first usage data that is indicative of viewing by the first user of media content; receiving second usage data that is indicative of viewing by the second user of the media content; determining change(s) to be made to the media content, wherein the change(s) are in accordance with the first and second personality traits, and wherein the change(s) are designed to minimize a stress level of the first user and / or the second user; editing the media content to reflect the change(s); and providing edited media content to the first and second users. Other embodiments are disclosed.

The present invention discloses a slurry shield excavation device and method suitable for super gravity simulation. The shield body and the slag feeding and discharging system are fixed by a bottom plate and placed on a geotechnical centrifuge. The soil box and the shield power system are connected by the shield body, and the shield body is connected to the slag feeding and discharging system. The front partition divides the working cabin into a slurry cabin and an air cushion cabin. One end of the main shaft passes through the slurry cabin and the air cushion cabin in sequence and is connected to the cutter head, and the other end is connected to the driving motor; one end in the cabin shell is movably connected to the opening of the soil box, and the other end is fixedly connected to the power box. The slag feeding and discharging system is used to transport mud in the working cabin and discharge mud. A pressure maintaining system is provided inside the cabin shell, and the pressure maintaining system is used to control the gas pressure in the air cushion cabin. The present invention can restore the stress level of the actual soil and simulate the excavation process of the actual slurry shield. Through the excavation parameters, mud pressure and soil response law during the excavation process, a theoretical basis is provided for the construction of deep buried and cross-sea tunnels.

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 embodiment of the invention relates to the technical field of casting nondestructive testing, and provides a casting risk grading nondestructive testing method and device, electronic equipment and a medium, and the method comprises the following steps: simulating stress distribution of a casting in an acceptance stage or a service stage of the casting to obtain different stress horizontal intervals corresponding to the casting; according to different stress horizontal intervals, different parts of the casting are divided into areas of different risk grades; and for areas with different risk levels, different detection methods are adopted to carry out nondestructive detection on the casting. According to the embodiment of the invention, a more scientific method is provided for nondestructive testing in the acceptance stage and the service stage of the casting, and the leak detection risk in the acceptance stage and the service stage is reduced.

The present invention relates to a method for estimating the severity of vibration, which is the product of vibration frequency f by antinode amplitude of vibration A, and for estimating fatigue lifetime or damage of a suspended electrical cable span of overhead power lines, said suspended electrical cable span having a sag possibly negligible with respect to span length, and a mean local tension H, and a local oscillating motion amplitude u(x, t) with a local space derivative of motion (I), and being subject to a variation of said tension H, motion amplitude u(x, t) and said space derivative over time (I) due to vibration, wherein said estimation of the severity of vibration Af is obtained from the measurements of said amplitude motion u(x, t) and said space derivative of the motion amplitude (I) according to the formula (II), where ω, (III), H, m, (I) and (IV), are respectively the pulsation of the oscillating motion, the wave speed, the mean local tension of the suspended cable span, the mass per unit length of the suspended cable span, the space derivative of said motion amplitude, and the acceleration of said motion amplitude; and wherein said fatigue lifetime or damage are obtained from a number of cycles estimated from said tension frequency analysis and a stress level is obtained from said motion amplitude and said space derivative of the motion amplitude.

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.

In an illustrative embodiment, an apparatus for controlling or reducing stress levels includes an ear-mounted device having an earpiece for positioning over a wearer's ear contacting tissue regions surrounding the ear, and electrodes for delivering non-piercing neurostimulation, with first electrode(s) arranged on a first surface of the earpiece to contact a first tissue region, and second electrode(s) are arranged on a second surface to contact a second tissue region. The auricular branch of the vagus nerve or the auriculotemporal nerve is situated beneath the first tissue region. The apparatus includes a controller to deliver therapeutic stimulation pulses via the stimulation device, where the pulses in combination with the positioning of the first electrode(s) and the second electrode(s) are configured to modulate the activity ratio between the sympathetic nervous system and the parasympathetic nervous system, thereby increasing vagal tone.

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 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.

The invention discloses a tensioning device and application thereof, belongs to the technical field of building material performance testing, and solves the problems that the deviation between the actual stress ratio and the theoretical stress ratio of a test piece is large, and the stress level is too high due to the fact that the bolt pretightening force is not easy to control too tight during unloading, and the stress level is insufficient due to the fact that the bolt pretightening force is too loose. The tensioning device comprises base plates, twisted steel bars and loading frames, a concrete cylinder test piece is arranged between the two symmetrical base plates, the two twisted steel bars are symmetrically distributed on the two sides of the concrete cylinder test piece, the two ends of the twisted steel bars penetrate through the base plates, the loading frames are arranged on one base plate, the twisted steel bars penetrate through the loading frames, and the loading frames are arranged on the other base plate. Self-locking assemblies are arranged on the back surfaces of the loading frame and the other base plate to realize self-locking of the twisted steel, and centering assemblies are arranged on the front surfaces of the two base plates to center and reinforce the concrete cylinder test piece. Different stress levels are applied to the concrete cylinder test piece by utilizing the tensioning device, so that dynamic mechanical property testing is carried out.

The invention provides a mental stress quantitative evaluation method and device for physiological and biochemical fusion monitoring, a skin interface microfluidic module of the device is used for realizing fresh sweat sampling and rapid refreshing, and accurate sweat analysis is carried out with high time resolution; the multiple layers of sensor patches are used for collecting physiological and biochemical signals related to mental stress; and the evaluation module is used for realizing continuous, real-time and accurate mental pressure monitoring according to the physiological and biochemical signals. According to the invention, long-term, real-time and accurate mental stress condition assessment can be carried out by using the wearable device without intervention of professionals; physiological and biochemical signals of a human body can be monitored at the same time, and specific recognition of a pressure source and a pressure level is achieved by combining the two signals; and sweat can be automatically collected for non-invasive monitoring.

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.

This disclosure provides methods, components, devices, and systems for mitigating anxiety of a passenger along a travel route while in a vehicle. Some aspects, more specifically, relate to detecting an anxiety level of a passenger during travel and implementing anxiety mitigating techniques to alleviate the anxiety. Travel anxiety can increase the stress of a passenger during travel, especially during air travel. In some aspects, a vehicle can analyze sensor data to detect a stress level of a passenger and determine a remedial action based on the stress level. Upon determining the remedial action, the vehicle can implement the remedial action so as to mitigate or alleviate the stress associated with the passenger while traveling in the vehicle.

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 relates to a method for predicting the fatigue life of an oil supply element of a high-pressure common-rail pump. The method comprises the following steps: acquiring the structural composition, load condition, failure form and stress analysis result of the oil supply element of the high-pressure common-rail pump of a diesel engine; key design parameters are obtained; carrying out single-factor test design and response surface test design; establishing a finite element model of the oil supply element, and obtaining stress distribution conditions of the oil supply element under different stress analysis results; solving the stress field finite element model, and recording a calculation result; obtaining single-factor regression analysis and response surface analysis of the key design parameters on the maximum equivalent stress of the key parts; under the same working condition, the stress level of the oil supply element is greatly reduced; predicting the fatigue life of the oil supply element of the high-pressure pump under different key parameter design values; predicting the maximum equivalent stress of the oil supply element under different key parameter design value combinations; and the research and development cost is greatly reduced.

Methods and systems for preparing a patient suffering from burnout to return to work with a therapeutic process by applying exposure therapy, including: applying a first scenario protocol, including: presents a first virtual reality scenario representing a first return-to-office scenario, including one or more burnout related triggers at a first level; applying a second scenario protocol, including: presents a second virtual reality scenario representing a second return-to-office scenario, including one or more burnout related triggers at a second level; wherein the burnout related triggers at the second level in the second return-to-office scenario are at a higher stress level in comparison to the burnout related triggers at the first level in the first return-to-office scenario.

Provided is an ultrafast laser shock forging assisted laser powder bed fusion (LPBF) method capable of inhibiting formation of thermal cracks in a high-strength aluminum alloy. Technical points of the present disclosure: During a LPBF process of an aluminum alloy, a molten layer is subjected to shock forging with a mechanical effect of ultra-high-pressure shock waves induced by an ultrafast laser to reduce a stress level of the molten layer, and a stress level is controlled layer by layer to eliminate the local stress concentration, thereby inhibiting the formation of thermal cracks. Advantages of the present disclosure: During a LPBF-based additive manufacturing process, a stress field is controlled to inhibit the formation of thermal cracks, and there is no need to add an alloying element or adopt a post-treatment, resulting in a simple and reliable process. A thermal crack density is accurately and efficiently controlled layer by layer.