69 results about "Stress evaluation" patented technology

The invention discloses a multi-parameter mental stress assessment method based on an analytical hierarchy method and a device. The method obtains a parameter set of mental stress influential factors through analysis of a frequency domain, a time domain and non-linearity of HRV signals of a testee, and obtains mental stress assessment results of the testee by the analytical hierarchy method and a mental stress assessment model. The device collects electrocardiograph signals of the testee, analyzes and assesses the electrocardiograph signals by the multi-parameter mental stress assessment method based on the analytical hierarchy method, outputs an assessment report and transmits the assessment report outwards. The multi-parameter mental stress assessment method based on the analytical hierarchy method and the invention have the beneficial effect that (1) a mental stress state of the testee is monitored according to changes of HRV physiological parameters of the testee, so influences brought by subjective factors and different cognitive levels of the testees to monitoring results are effectively avoided; and (2) the daily mental stress state of the testee is effectively recorded and analyzed, and key data is stored to remind the testee of self-adjustment and taken for standby application of medical staffs.

The invention relates to the stress evaluation of a laser cladding layer and in particular relates to a nondestructive evaluation method of the stress of a cladding layer based on a critical refraction longitudinal wave. According to the invention, the nondestructive evaluation of the cladding layer stress is realized through selecting a double critical refraction longitudinal wave probe with a suitable central frequency; an optimum propagation distance is determined as the spacing distance between a propagation probe and a receiving probe to be fixed by combining the law that the energy of the critical refraction longitudinal wave in the cladding layer decays; the time difference between the critical refraction longitudinal signals is used for representing the change amount of the propagation speed of the cladding layer in the critical refraction longitudinal wave caused by the stress and taken as the characteristic parameter to evaluate the stress of the cladding layer to build a stress-time difference relation; a liner function is adopted to fit results to obtain an acoustoelastic equation used for representing the stress of the cladding layer, and therefore the nondestructive evaluation of the stress of the cladding layer based on the critical refraction longitudinal wave is realized.

The invention discloses a multi-parameter mental stress evaluation method based on a BP neural network algorithm. The method comprises the steps that an HRV signal of a person to be tested is subjected to frequency domain, time domain and nonlinear analysis to obtain mental stress influence factor parameter set, according to the parameter set, the BP learning algorithm is adopted, an error function is adopted for learning according to a gradient descent method, the mean square error between an actual output value and an expected output value of a network is made to be the minimum, and an accurate mental stress evaluation result of the person to be tested is obtained. By adopting changes of HRV physiological parameters of the person to be tested, the mental stress state of the person to be tested is monitored, and the influence caused by different subjective factors and cognitive levels of the person to be tested on the monitoring result is effectively avoided; the mental stress evaluation accuracy and reasonability of the person to be tested are effectively improved.

The invention relates to an electromechanical comprehensive supporting and hanging bracket design method based on a BIM technology. The method comprises the steps of determining an electromechanical pipeline space arrangement scheme and building an electromechanical pipeline model; 2, compiling a three-dimensional comprehensive supporting and hanging bracket preliminary design scheme, creating a comprehensive supporting and hanging bracket design model, linking and merging an electromechanical pipeline BIM model member and a comprehensive supporting and hanging bracket preliminary design modeland conducting bump detection; 3, utilizing stress calculation software of SAP 2000 and the like to conduct three-dimensional supporting and hanging bracket stress evaluation and modifying the three-dimensional comprehensive supporting and hanging bracket preliminary design scheme according to stress calculation analysis data; 4, outputting a comprehensive supporting and hanging bracket design calculation sheet and extracting a comprehensive supporting and hanging bracket engineering quantity; 5, exporting a construction map according to the three-dimensional model, outputting a BIM model file and conducting visualized design technology disclosure. By means of the electromechanical comprehensive hanging bracket design method based on the BIM technology, the field actual supporting and hanging bracket installation effect can be visually displayed, the installation space is saved, it is guaranteed that an electromechanical pipeline is reasonably and attractively arranged, and the risk of implementing the project is lowered.

To fully evaluate a real signal line and a real memory cell adjacent to a dummy signal line and utilize dummy signal line as real signal line, a semiconductor memory includes at least one real signal line connected to real memory cells driven by a real driver and at least one dummy signal line outside the real signal line connected to dummy memory cells, driven by a dummy driver. Real driver and dummy driver drive the real signal line and the dummy signal line synchronous with a common timing signal generated by an operation control circuit. Consequently, a stress evaluation is also performable, e.g., on a real signal line outside of a memory cell array under the same condition of a real signal line on the inner side. Dummy signal line is driven using common timing signal and evaluated, thus being usable as a redundancy signal line to relieve failure.

In an evaluation process, a first muscle strength (i.e., muscle potential) of a first muscle responsible for a dorsiflexing action of the ankle joint of a leg manipulating an accelerator pedal is acquired using a first muscle potential sensor. A second muscle strength (i.e., muscle potential) of a second muscle responsible for a plantarflexing action of the ankle joint of the leg manipulating the accelerator pedal is acquired using a second muscle potential sensor. Then, on the basis of time-series variation of each of the muscle potentials acquired using the first and second muscle potential sensors, a synchronous activity level is calculated as an evaluation index. When the difference between the evaluation index and an evaluation standard pre-determined is not less than a prescribed value, it is evaluated that an occupant of a vehicle feels stress as a result of manipulating an in-vehicle information apparatus while driving the vehicle.

The invention relates to a production increase method for a deep layer shale gas reservoir. The production increase method comprises the following steps that (1) compressibility and ground stress evaluation is conducted on a stratum; (2) cluster perforation parameters are determined, and the perforation mode is circumferential perforation; (3) after crake parameters and construction parameters are determined, fracturing is conducted on target stratum shale; (4) pre-acid-fracturing treatment is conducted, and acid fracturing adopting high mucic acid and closed acidizing treatment adopting low mucic acid are included; (5) slickwater containing a propping agent is injected, and the sand-to-liquid ratio is gradually increased to be 20% from 1%; and (6) high viscosity glue liquid containing a propping agent is injected, and the sand-to-liquid ratio is gradually increased to be 23% from 5%. A deep layer shale gas well is transformed by using the production increase method, and the productive potential of the deep layer shale gas reservoir can be increased.

The invention discloses a fuzzy logic and evidence reasoning-based transformer insulation stress calculation and evaluation method. The method comprises the following steps of firstly normalizing field data, namely, converting input data for describing a normal value, a limit value and the like of a transformer into dimensionless variables of a [0,1] region; secondly fuzzifying the input data, namely, mapping the input data to a fuzzy membership function, wherein a trapezoidal membership function, a generalized bell-like membership function or a Gaussian membership function can be used; thirdly building a transformer stress evaluation tree model, namely, establishing nodes from the input data of the transformer to an insulation stress of the transformer, and a connection mode of the nodes, and correlating the nodes of upper and lower layers by using a fuzzy correlation matrix; fourthly determining a weight value between the nodes, namely, obtaining a synthesized weight value by using a subjective weight value of an analytic hierarchy process and an objective weight value of eigenvector analysis; and finally obtaining the insulation stress of the transformer, namely, determining a total stress level of the transformer by using a reasoning mechanism and an evidence synthesis rule. The method has the advantages in accuracy, flexibility and capability of processing measurement uncertainty.

The invention discloses a shale gas rock physics and logging method comprising the following steps: building a shale gas reservoir rock physics model considering Kerogen particles, and predicting logging vertical and transverse wave speed; calculating reservoir maximum and minimum horizontal principal stress and fracture pressure; carrying out accurate stress evaluation for the shale gas reservoir even under no transverse wave logging. The shale gas rock physics and logging evaluate method can build the rock physics model so as to truly reflect shale gas reservoir complex minerals and multi-pore types caused by the complex minerals, i.e., the method can reflect the rock physics characteristics of the Kerogen existing in certain form in a scatter manner; the rock physics model can carry out reservoir speed prediction, thus improving prediction speed precision, i.e., improving shale gas reservoir logging method reliability.

The invention provides a valve body optimization design method. A three-dimensional geometrical model is established through a parameter method, thereby facilitating optimization design and greatly shortening design modification time. Through an established stress evaluation rule, various types of stresses which generate different failures are considered. A plurality of evaluation conditions are used for evaluating the stress. Whether the structural strength of the valve body satisfies a safety requirement can be comprehensively and integrally evaluated. Furthermore the economical performance of the structure is evaluated through a stress result. According to an economical performance evaluation standard, contributions of different types of stresses to the structural strength are sufficiently considered, and furthermore a difference between design and reality is considered. When the structure of the valve body satisfies safety evaluation and furthermore satisfies economical performance evaluation, not only is high safety of the valve ensured, but also the material can be saved maximally and the bearing potential of the structure is sufficiently exerted, thereby reducing weight of the valve body, saving material, reducing cost, and making the designed structure more reasonable and more economical.

A novel method for whole field thin film stress evaluation is provided. Through the provided method, the whole filed thin film stress distribution for an optical thin film would be developed with a commercial interferometer, so that a whole field evaluation for the crack or peel-off of thin film is hence achievable.

The invention relates to an evaluation method for critical stress and plateau stress of honeycomb paperboard, belonging to the performance detection field of honeycomb paperboard. The detection method adopts a measurement device to measure the thickness t of a honeycomb fiberboard medium, the edge length I of honeycomb pores, the elastic modulus Es, the poisson ratio vs and the flexing stress of the honeycomb fiberboard medium and the like; utilizes critical stress detection method and plateau stress evaluation method to process detection and calculation. The invention adopts the evaluation method on the critical stress and plateau stress of honeycomb paperboard to test the data relative to honeycomb paperboard, therefore, obtained relative detection data is accurate and the evaluation method is simple and fast. The evaluation method provides basis for the manufacture, material selection and structure design of honeycomb paperboards.

To provide a technique for measuring a state of stress by objective symptoms having a correlation with stress in a mobile terminal device. In order to the above object, a program is provided, and a mobile terminal device reads and executes the program to perform: a video-on step for enabling a moving image capturing function of the mobile terminal; a light-on step for enabling a light disposed at an image capturing side of the mobile terminal; a pupil recognition step for recognizing pupils of animal eyes from an image that is being captured, wherein the animal eyes include human eyes; and a pupil change calculation step for calculating a pupil change, wherein the pupil change is a change in a dilation level of the recognized pupil over time.

The present invention provides a method which can simply and quickly evaluate a fatigue characteristic of a T joint part of a T-type welding joint structure without actual manufacturing of a welding joint for fatigue test, wherein, when a curvature radius of a weld toe of the T joint part is set to rho (mm), a uniform strain rate (%) of a welding heat effect part of the T joint part is set to UEHAZ, and a yield stress (MPa) of the welding heat effect part of the T joint part is set to YPHAZ, the fatigue characteristic of the T type welding joint structure is evaluated through using a weld toestress evaluation parameter which is represented by a formula (1): weld toe stress evaluation parameter (1)= (1.13*10-2*rho-0.59)*(1.05*10<-4>*UEHAZ+1.64*10<-2>)*(5.15*YPHAZ-0.92).

The invention relates to a three-modulus-based shale ground stress three-dimensional seismic characterization method. Firstly, three-dimensional seismic characterization of a shale ground stress is achieved. Different logging information of a stratum is analyzed and judged through regressive analysis by utilizing actual logging data, three-modulus rock physics elastic parameters are preferably regarded as characterization independent variables for stress evaluation, and a maximum principal stress and a minimum principal stress are characterized; the advantages of a seismic data three-dimensional data volume are exerted in space variation prediction, and an elastic parameter data volume of stress characterization is obtained through inversion by combining a seismic prestack elastic inversion technology. Finally, the three-dimensional quantitative evaluation of the ground stress is achieved through analyzing and correcting errors of the data volumes, thereby providing a three-dimensional quantitative judgment method for prediction and effective evaluation of the ground stress, and effectively solving the problem of stress seismic prediction. The three-modulus-based shale ground stress three-dimensional seismic characterization method increases the precision of stress prediction, and provides effective technical guidance for unconventional oil and gas exploration.

The invention discloses a steel bridge structure health state evaluation method and device, equipment and a storage medium. The method comprises the steps of collecting various disease images of the surface of a steel bridge and microscopic images of the surfaces of all components under different stress and fatigue states; constructing and training a structural disease classification and damage evaluation model by taking the various disease images as input and taking disease types and damage degrees as output; constructing and training a steel classification and stress evaluation model and a steel classification and fatigue state evaluation model by taking the microscopic images as input and taking steel type, fatigue life and stress identification as output; using a multi-lens steel bridge wall-climbing robot to collect fixed-time and fixed-point detection images; and respectively inputting the detection images into the corresponding evaluation models to respectively obtain predictedscoring results of the disease damage degree, the stress state and the fatigue state, and performing weighted summation according to the three evaluation scores of each component to obtain an overallhealth state score of the steel bridge structure. The method is safe, effective, easy and convenient to operate, higher in precision and high in intelligent degree.

A stress evaluation apparatus includes an impedance measuring unit for measuring an impedance of a fluid discharged from a living body; a temperature measuring unit for measuring a temperature of the fluid discharged from the living body; a pH calculating unit for calculating a pH value based on the impedance and temperature of the fluid discharged from the living body; and a stress evaluating unit for evaluating a stress based on the pH value calculated by the pH calculating unit.

To fully evaluate a real signal line and a real memory cell adjacent to a dummy signal line and utilize dummy signal line as real signal line, a semiconductor memory includes at least one real signal line connected to real memory cells driven by a real driver and at least one dummy signal line outside the real signal line connected to dummy memory cells, driven by a dummy driver. Real driver and dummy driver drive the real signal line and the dummy signal line synchronous with a common timing signal generated by an operation control circuit. Consequently, a stress evaluation is also performable, e.g., on a real signal line outside of a memory cell array under the same condition of a real signal line on the inner side. Dummy signal line is driven using common timing signal and evaluated, thus being usable as a redundancy signal line to relieve failure.

The invention belongs to the experimental animal field and relates to a method for evaluating and intervening the experimental animal short-distance transportation stress. By observing the effect of the short-distance transportation stress on the experimental animals, the method establishes the short-distance transportation stress evaluation, comprises technology index systems such as energy metabolism totem GLU, immunologic function executor WBC, HPA axial final effect laser CORT, etc., ensures that the health adaptive stage after the short-distance transportation stress is at least 72 hr and provides the nutrition replenisher intervention measure for relieving the adverse reaction of the short-distance transportation stress. The method can provide the experiment basis for scientification and standardization of the experimental animal short-distance transportation, avoid the damage to the health and the wellbeing of the experimental animals caused by the short-distance transportationstress and the background disturbance thereof, solve the actual problems with production and linkage and ensure the scientificity and the validity of the biomedical scientific research and the product certification.

The invention discloses a well-surrounding near-well-wall stratum damage evaluation method based on logging information. The method comprises the steps: calculating a rock anisotropic rigidity coefficient according to full-wave-train dipole acoustic logging information; calculating the elastic modulus, Poisson's ratio and Thomsen coefficient of the rock and the flexibility coefficient of the rock; according to the full-wave-train dipole acoustic logging information, obtaining the radial section of the acoustic velocity of the stratum around the well wall; calculating the flexibility tensor variable quantity of any position close to the well wall; and according to the flexibility tensor variable quantity of any position near the well wall, calculating dispersion damage parameters of stratum rocks at any position near the well wall. According to the method, acoustic logging is adopted to evaluate the damage characteristics of the stratum close to the well wall, the stratum is regarded as a transverse isotropic medium, and acoustic logging information is utilized to calculate and analyze rock mechanical parameters, Thomsen anisotropy coefficients and mechanical damage parameters of different lithology and different radial positions; and the method plays a very important role in ground stress evaluation, borehole wall stability analysis, hydraulic fracturing and the like.

The invention relates to an evaluating method for the pressure of tight seamless underwear based on a double logarithmic model. The method includes the steps of taking three indexes including human dimension, clothing dimension and fabric elongation as parameters, and constructing a pressure prediction model for the upper and lower portions of the tight seamless underwear by using a regression equation and based on a double log-linear model; building a pressure evaluative criterion table through a box control chart statistical mode; and obtaining predicted pressure, feeling of pressure, comfort and forming effects of the tight seamless underwear product according to the pressure prediction model and the pressure evaluative criterion table. The method can predict the pressure comfort and forming effect of the tight seamless underwear in a wearing process.

The present invention discloses a correction method of influence of a pore diameter on evaluating stress of metal materials through critical refraction longitudinal waves. The method comprises: optimizing the center frequency and the propagation distance of a dual-critical refraction longitudinal wave probe, signal amplitudes received by the critical refraction longitudinal wave are taken as evaluation parameters, the critical refraction longitudinal wave detection depth is determined by combining an equivalent method, and regular blind holes with a constant processing depth and different diameters are configured to simulate internal pores. A probe clamping device with adjustable pressure is employed to collect critical refraction longitudinal wave signals, the time difference of the critical refraction longitudinal waves passing through the same propagation distance is taken as a stress evaluation parameter, and the relationship between the critical refraction longitudinal wave propagation time difference of each blind hole with different diameters and the stress is built, so that the relation of the critical refraction longitudinal wave sound elastic coefficient and the diameters of the blind holes is obtained, and the correction of the influence of the pore diameters on evaluating stress through critical refraction longitudinal waves. The correction method of influence of a pore diameter on evaluating stress of metal materials through critical refraction longitudinal waves is lossless and rapid, etc.

The invention discloses a geostress evaluation method based on mechanical instability collapse of a well wall. The method comprises the following steps: screening mechanical instability collapsed well sections and classifying data; representing deep ground stress and borehole wall stress based on a tectonic strain coefficient; establishing a tectonic strain coefficient equation based on a stress limit equilibrium condition; solving the tectonic strain coefficient based on a least square method and calculating horizontal principal stress; In the present invention, the well wall stress instability collapsed well section data and collapsed data classification are screened, the stress limit equilibrium equation is created based on the strain factor and solve the overdetermined equation based on the information constraints of the critically collapsed formation, the maximum principal stress and minimum principal stress of the in-situ level of the evaluation deep part are calculated. an in-situ stress result rationality evaluation method is given, quantitative calculation and evaluation of the horizontal principal stress of the deep stratum are realized, and necessary deep stratum mechanics basic parameters are provided for underground deep engineering, especially oil and gas well engineering, oil and gas exploitation engineering and the like.

The invention relates to an application method of industrial pipeline mechanics computational analysis, in particular to an easy-to-use pipeline stress evaluation method aiming at engineering practical problems. The application method of industrial pipeline mechanics computational analysis starts with load type during actual analytical calculation, then takes various conditions in completing calculation into consideration, and at last acquires required calculation results; and accordingly a new analytical requirement definition method completing the whole pipe stress calculation process is designed. The method can lower professional requirements on program application workers, reduces the error possibility during program using, and further improves efficiency and quality of pipeline mechanics calculation works.

The invention discloses a mental stress evaluation system based on VR equipment. The system comprises an external physiological parameter acquisition module, a test program module, a visual output module, an auditory output module and input equipment. The external physiological parameter acquisition module is used for acquiring various human physiological parameters in a mental stress evaluation process; the test program module is used for storing three test programs used for mental stress evaluation; the visual output module is used for clearly displaying set content and content changes in the test programs to achieve exact mental stress applied on an experimental subject; the auditory output module is used for playing the content set in the test programs in the mental stress evaluation process and guiding the experimental subject in correctly completing the mental stress evaluation; the input equipment is used for selecting the content in the mental stress evaluation process. The system can eliminate external disturbances and accurately perform mental stress evaluation on the experimental subject.

The invention relates to the technical field of ground stress measurement, in particular to a deep hole difference stress evaluation method based on a secondary sleeve core. The evaluation method comprises the following steps of: taking out a large rock core with a large diameter from a drill hole, and carrying out a radial deformation test on the large rock core; sleeving the large rock core to take a small rock core, and performing radial deformation test on the small rock core; wherein the difference value of the horizontal principal stress is that the diameter of the large rock core is larger than that of the small rock core. According to the method, the accumulated width of the stress-induced micro-cracks in the large rock core can be obtained and eliminated, so that the difference stress measured based on the elastic deformation of the rock core can be more real and accurate.

The invention discloses a stress evaluation method and a stress evaluation system. At first, accord to that load component causing the primary stress in the connected area between the nozzle and the shell, the characteristic parameter of the nozzle and the distance from the action point corresponding to each load component to each evaluation path, each stress component of the composite primary stress is determined; then, the three-dimensional principal stress is determined according to each stress component, and the calculated stress intensity of the primary stress is determined according to the three-dimensional principal stress. Finally, according to the allowable stress of the material corresponding to the position of the evaluation path and the calculated stress intensity, the joint area of the nozzle and the shell is evaluated once. The invention takes the dangerous path as the evaluation path, and evaluates the different stress components caused by different loads accordingly, soas to effectively ensure that the strength of the pressure vessel is qualified and avoid unnecessary cost increase at the same time. On this basis, the stability of the pressure vessel can be ensuredby combining the primary and secondary stress assessment of the connecting area between the nozzle and the shell.

The invention discloses a human body heat stress early warning system based on heart rate monitoring and a labor metabolism prediction method. The system mainly includes a heart rate monitoring device, a metabolic rate calculation module, a PHS prediction module, a thermal stress index HSI calculation module, a thermal stress grading evaluation module and a human body thermal stress warning module. The method mainly includes the steps of 1) monitoring the real-time heart rate under working conditions; 2) calculating the real-time metabolic rate; 3) calculating physiological parameters and human physiological heat production and heat dissipation through a PSH model; 4) calculating and outputting the actual vaporization heat loss Ereq and the maximum vaporization heat loss Emax; 5) outputting the real-time thermal stress index HIS of a tester; 6) predicting and judging the risk level signals; 7) outputting the thermal stress evaluation level and warning signals by a controller. Accordingto the method, convenient safe evaluation guarantee can be provided for labor protection and occupational injury reduction of labor groups in high temperature operation related industries.