22 results about "Stress change" patented technology

The invention provides a mass flow meter measurement compensation method and system combined with pipeline stress perception, and relates to the technical field of instrument correction. The method comprises the steps that an original stress data set is obtained; constructing a stress characteristic parameter set; constructing a sensor parameter set; based on the stress characteristic parameter set and the sensor parameter set, calculating the stress variation of the pipeline in the axial direction, the radial direction and the torsion direction to obtain a stress variation data set; utilizing the stress change data set and the sensor parameter set to establish a coupling model of the pipeline stress change to the vibration frequency and the phase signal of the sensing pipe, and calculating a corrected mass flow value; according to the comparison result of the corrected mass flow value and the calibration point in the long-term operation process, a parameter optimization algorithm is applied to conduct self-adaptive adjustment on the coupling coefficient, and coupling model optimization is achieved. The technical problem of measurement deviation caused by external stress, structural deformation and dynamic load in the prior art is solved.

The application discloses a water gate structure stress and seepage flow intelligent monitoring system, and belongs to the technical field of water conservancy projects.The system comprises a stress monitoring module, a seepage flow collecting module and a data processing and analysis module.The stress monitoring module is used for monitoring the stress change of the water gate, including the stress change of key parts, wherein the key parts include a gate pier, a gate and a breast wall.The seepage flow collecting module is used for collecting the seepage pressure and seepage flow of the water gate.The data processing and analysis module is used for processing the stress change, seepage pressure and seepage flow, including cleaning and correction.The application can monitor the stress change of the key parts of the water gate, collect the seepage pressure and seepage flow, obtain more comprehensive and accurate monitoring data, and perform fusion processing on the data, so that the limitation of relatively independent data in traditional monitoring is broken, mutual verification and supplement among the data are realized, the safety state of the water gate is comprehensively evaluated from multiple dimensions, and the accuracy and reliability of monitoring are improved.

The invention relates to the technical field of structural stability analysis, in particular to a support hanger instability early warning method fusing stress and angle data, which comprises the following steps: synchronously acquiring real-time axial stress and space pitch angle of a support hanger node, and generating a time sequence data pair; calculating a stress change rate and an angle change rate; constructing a stress-angle deviation index; setting a dynamic threshold value according to the real-time thermal displacement speed of the pipeline; and when the duration when the stress-angle deviation index is greater than the dynamic threshold exceeds the early warning time window T, determining that the constraint is invalid and triggering early warning. Compared with a traditional monitoring method which only depends on stress or displacement judgment, early coupling instability symptoms such as structural rigidity degradation, gap slippage and thermal expansion constraint imbalance can be effectively captured, and high-sensitivity response to dynamic structural behaviors is achieved.

The application provides a pipeline stress-aware mass flowmeter measurement compensation method and system, relates to the technical field of instrument correction, and the method comprises the following steps: obtaining an original stress data set; constructing a stress characteristic parameter set; constructing a sensor parameter set; calculating stress change amounts of the pipeline in axial, radial and torsional directions based on the stress characteristic parameter set and the sensor parameter set, and obtaining a stress change data set; establishing a coupling model of pipeline stress change on sensor vibration frequency and phase signal by using the stress change data set and the sensor parameter set, and calculating a corrected mass flow value; and according to the comparison result of the corrected mass flow value and a calibration point in a long-term operation process, applying a parameter optimization algorithm to adaptively adjust the coupling coefficient, so that the coupling model is optimized. The technical problem of measurement deviation caused by external stress, structural deformation and dynamic load in the prior art is solved.

The present application relates to the technical field of structural stability analysis, and particularly relates to a support and hanger instability early warning method fusing stress and angle data, comprising the following steps: synchronously collecting real-time axial stress and spatial pitch angle of a support and hanger node to generate a time series data pair; calculating stress change rate and angle change rate; constructing a stress-angle deviation index; setting a dynamic threshold according to a real-time thermal displacement speed of a pipeline; when the stress-angle deviation index is greater than the dynamic threshold for a duration exceeding an early warning time window T, determining that the constraint is invalid and triggering early warning. Compared with a traditional monitoring method relying only on stress or displacement, the present application can effectively capture early coupling instability signs such as structural stiffness degradation, gap slip and thermal expansion constraint disorder, and realize high-sensitivity response to dynamic structural behavior.

The application discloses a kind of rock burst damage phenomenon's fraction compensation control method, belong to geotechnical engineering technical field, comprising the following steps: S1: geological exploration;S2: prestressed anchor cable system construction;S3: place, fixed stress monitoring element;S4: anchor cable placement and hole grouting treatment;S5: initial tensioning;S6: rock burst section excavation;S7: fraction compensation tensioning;S8: rock burst zone excavation is completed.The application uses anchor cable prestressed tendon, cooperates the real-time stress monitoring result of rock mass, obtains the stress change of rock mass after stress release under external force, according to stress change, fraction compensation tensioning is carried out to prestressed anchor cable, to meet the external force acting on rock mass, reach the balance when rock mass is undisturbed, avoid the harm caused by rock burst.

The application relates to the technical field of injection molding process control, and discloses an intelligent regulation and control elimination method and system for internal stress of an injection molded part. The method is used for monitoring temperature and time data in the forming process of the injection molded part in real time, constructing a stress distribution field in a glass transition temperature interval through numerical simulation, extracting a threshold value in combination with a material characteristic database to determine a stress change turning point time position, comparing stress locking stage values based on the time position, dividing a high-risk area and determining an intervention priority, screening an intervention opportunity window, establishing a dynamic corresponding relationship between time and stress, and determining an optimal intervention time point for internal stress regulation under the condition that stress is not completely locked and elimination efficiency is optimal. The application can accurately position an internal stress intervention opportunity, improve stress elimination efficiency and injection molded part forming quality, effectively avoid problems such as deformation and cracking caused by excessive internal stress, and adapt to the intelligent regulation and control requirements of high-precision injection molding.

The invention relates to the technical field of mine safety monitoring and disaster early warning, in particular to a stress co-evolution point column type filling stope roof health diagnosis and early warning method. The method comprises the steps that a monitoring system is arranged, and three monitoring points are arranged in a roof rock mass right above point columns, in a roof rock mass between adjacent point columns and in a roof rock mass supported by the maximum-span point-free columns respectively; collecting three-dimensional stress data monitored by each group of monitoring points, and synchronously recording the mining progress; determining the length of a monitoring time window according to the mining progress; calculating a roof danger index, wherein the roof danger index comprises a load transfer ratio, a stress change collaboration degree, a horizontal constraint weakening index and a principal stress change increment trajectory angle; and calculating the dynamic roof health degree according to the roof danger index, and performing roof health diagnosis and graded early warning. By adopting the method, the cooperative working state of the point column top plate structure can be dynamically sensed, and accurate and advanced top plate health diagnosis and early warning can be realized.

This invention relates to a method for expressing the physical properties of an elastic material when there is a change in strength in a plastic region. The method includes: a region setting step, wherein the region setting step defines a base region indicating the relationship between strain and stress in the first material and a variation region indicating the portion of stress change according to strain caused by factors induced by the pre-straining and heat treatment of the second material in a first material; and a simulation step, wherein the simulation step expresses the relationship between stress change and pre-strain in the variation region as a Boltzmann function, and derives the relationship between strain and stress in the second material as the sum of stresses according to strain in the base region and the variation region.

The application discloses a method for converting strain rate by using an environmental fatigue correction factor, and the method is based on the peak stress and the valley stress of transient combination in fatigue calculation, and the average strain rate and the strain range are calculated, and the environmental fatigue correction factor under each combination is obtained by weighting. The method can consider the influence of the stress history of the structure on the environmental fatigue correction factor by considering the peak value and the valley value in the stress change history, and the influence of the transient stress fluctuation can be simplified and enveloped by the average effect of the peak value and the valley value stress, so that the method is suitable for a wide range of applications.

This invention discloses a test device for monitoring deformation and stress changes in roadway surrounding rock, comprising: a mounting plate with four L-shaped vertical plates; a pressure assembly including multiple vertically mounted, rectangularly arranged pressing components on the mounting plate, each pressing component having a downward-facing telescopic end and a pressure plate at each telescopic end, the pressing components driving the pressure plate downward to apply test pressure to the test specimen; a detection assembly with a moving trolley at its bottom, the moving trolley driving the detection assembly to move closer to or further away from the test specimen, the detection assembly being able to insert into the corresponding test position on the test specimen during movement, and also being able to rotate, expand, or retract to cooperate with the pressing components in performing test measurements on the test specimen; and a sensing assembly mounted on the mounting plate. This invention can simulate relevant roadway conditions and perform test monitoring, thus facilitating practical use.

The invention discloses a control loop vertical ring stress trend identification method based on regression fusion, and relates to the technical field of hydroelectric generating set operation and maintenance monitoring and fault early warning, and the method comprises the steps: collecting related data of a control loop vertical ring, and carrying out the preprocessing; acquiring historical operation data lasting for a preset duration, and taking the historical operation data as a health reference sample; obtaining a regression prediction equation based on the health reference sample; calculating the statistical magnitude of the vertical ring stress of the control ring, and generating a dynamic statistical reference for real-time monitoring; calculating a real-time predicted stress by using the regression prediction equation, and comparing the real-time stress with the real-time predicted stress and a statistical reference to obtain a stress deviation index and a stress fluctuation index; and performing multi-stage judgment according to the stress deviation degree index and the statistical reference. According to the method, the quantitative relation between the working condition parameters is constructed through the linear regression method, prediction of the stress change trend is achieved, and multi-level health state recognition is achieved through multi-index judgment.

The invention relates to the technical field of rehabilitation monitoring, in particular to a surface electromyogram signal-based exercise ability rehabilitation monitoring system for the elderly at home. The data acquisition module is used for acquiring pressure and electromyographic signal time sequence data of each monitoring point of the intelligent mattress, determining a pressure core point according to a pressure value difference at each moment, and reflecting a main stress position; the monitoring weight analysis module analyzes the pressure value change to determine a human body state change index, further determines a pressure stable node, analyzes the position relation between a monitoring point and a pressure core point and the pressure change trend under the pressure stable node, and determines a monitoring weight, so that data acquisition and analysis are more targeted; the monitoring necessity analysis module integrates various factors to obtain the monitoring necessity degree value of each monitoring point at each moment, and reflects the importance degree of the monitoring point on rehabilitation monitoring; and the rehabilitation condition monitoring module accurately intercepts electromyographic signal segments in sequence to truly reflect the muscle activity of the old people during effective movement, so that the rehabilitation evaluation is more accurate and credible.

The application discloses a stress-life model considering the influence of stress gradient and micro-sliding amount of the edge of a contact area in a plane contact state, designs a mathematical model for calculating the fatigue life of a component by using stress in the plane contact state considering the plane stress gradient and the influence of the micro-sliding of the contact area, and introduces the stress gradient of the edge of the contact area and the sliding displacement amount of the edge of the contact area for the plane contact problem on the basis of the most basic stress-life equation, and corrects the stress term on the left end of the equation, so that the stress-life model has good fitting effects on high-cycle fatigue and low-cycle fatigue and has good physical significance. When the stress-life model is applied, only the data of the stress change and the relative sliding amount of the structure are needed, and then the life prediction calculation can be performed, so that the process of the fatigue life prediction is simplified.

The present application relates to the technical field of mine safety monitoring and disaster early warning, and more particularly to a stress synergistic evolution point column filling stope roof health diagnosis and early warning method. The method steps are: arranging a monitoring system, setting three monitoring points in the roof rock mass directly above the point column, in the roof rock mass between adjacent point columns, and in the roof rock mass without point column support with the maximum span; collecting three-direction stress data monitored by each group of monitoring points, and synchronously recording the mining progress of the mine; determining the monitoring time window length according to the mining progress of the mine; calculating the roof danger index, which includes the load transfer ratio, the stress change synergy degree, the horizontal constraint weakening index, and the main stress change increment trajectory angle; calculating the dynamic roof health degree according to the roof danger index, and performing roof health diagnosis and grading early warning. By using the above method, the synergistic working state of the point column roof structure can be dynamically perceived, and accurate and advanced roof health diagnosis and early warning can be realized.

The application discloses a stress test and dangerous area evaluation method for an intermittent heat source heat storage tank of a fusion device, belongs to the technical field of performance detection of core equipment of an energy storage system of a fusion device, and aims at liquid level periodic change and thermal-mechanical coupling problems caused by intermittent operation of a fusion reactor. The application reproduces a heat storage tank operation process by simulating liquid level circulation and thermal loss boundary conditions under actual working conditions. Strains are monitored by using a layered point distribution mode to obtain stress change rules, maximum stress values and amplitudes in a complete period. On this basis, strength and fatigue dangerous areas are identified, and dynamic migration characteristics of the dangerous areas with changes in a liquid level and a temperature interface are revealed. The application solves the problem that existing technologies cannot reflect dynamic coupling stress and dangerous area changes, and provides reliable data support for structural optimization design, strength checking and fatigue life analysis of the fusion heat storage tank.

The utility model discloses a sensor bolt which comprises a bolt body, a sensor mounting hole, a threaded base, a counterbore and a sensor. Compared with the prior art, the sensor is installed inside the bolt in a composite mode, the stress change condition can be monitored in real time, the overall stress state can be known, meanwhile, the temperature change can be monitored in real time, the situation of insufficient bolt pre-tightening force can be found in time, maintenance can be optimized, the service life of equipment can be prolonged, and the overall safety of a connecting structure can be improved. And subsequent intelligent management is facilitated.

The invention relates to the technical field of medical instruments, and provides a collision detection method and system, and the method comprises the steps: obtaining the real-time stress data of an execution part in a process of controlling the execution part to move to a target position, and the real-time stress data comprises a strain signal value provided by a strain sensor; according to the real-time stress data, whether a stress change value of the execution part meets a collision triggering condition or not within specified time is monitored, and the stress change value is the fluctuation amplitude of the strain signal value relative to the strain reference value; after the collision triggering condition is met, the stress change acceleration condition of the execution part is determined according to the real-time stress data within the specified time; and when the stress change acceleration condition is in an abnormal acceleration state, judging that the execution part is collided. According to the invention, high-precision collision detection can be realized, the anti-interference capability is strong, and the collision damage of the liquid transfer part can be effectively prevented.

The utility model provides a coil pipe which comprises a pipe body, and a plurality of notches are formed in the pipe body so as to improve flexibility and allow the pipe body to adapt to different bending angles. A first protrusion and a second protrusion are arranged between every two adjacent notches, the protrusions extend outwards from the pipe body, and a first wire containing portion and a second wire containing portion are formed on the base portions of the protrusions respectively. When the pipe body is bent, the adjacent first wire containing part and second wire containing part respectively face different side surfaces, so that staggered arrangement of the wires is realized, the wires are prevented from slipping off due to stress change, and the stability of the pipe body in a bent state is improved. The coil pipe provided by the utility model has excellent flexibility, durability and wire rod fixing capability, and is particularly suitable for application scenes requiring accurate adjustment of wire rod layout and bending control.

A method for generating stress level information indicative of a stress level of a population comprising a plurality of individuals, in which a real-time statistical value of the stress level of the population is generated by statistically processing real-time individual stress information for each of the plurality of individuals of the population; upon receiving more real-time individual pressure information for each of the plurality of individuals via the network, continuously updating the real-time statistical value; receiving, via the network, information indicative of a pressure change event occurring in real time, and associating the real-time statistics of the pressure level for the population with the pressure change event occurring in real time; obtaining a group pressure index according to the association, wherein the group pressure index indicates the pressure of a group consisting of the plurality of individuals caused by a pressure change event occurring in real time; and notifying at least some of the plurality of individuals of the population stress index or notifying a third party of the population stress index.

This invention relates to the field of aircraft structural stress change detection technology, and particularly to a system for monitoring structural stress changes in aircraft and its usage method. It solves the problem that existing aircraft protective supports cannot automatically control and detect the aircraft's stress status in real time. The technical solution is as follows: A system for monitoring structural stress changes in aircraft includes: a ground operation module, multiple protection and support adjustment modules, and multiple attitude detection modules; the ground operation module, multiple protection and support adjustment modules, and attitude detection modules are connected wirelessly; a usage method for monitoring structural stress changes in aircraft includes the following steps: S1: manual mode operation; S2: adjusting the aircraft state to its original gravity state; S3: adjusting the aircraft state to its original attitude state; S4: automatic mode and system fault operation state. The beneficial effects of this invention are: this invention can monitor the stress changes of the aircraft in real time, effectively protecting the structural safety of the aircraft.