21 results about "Stress limit" patented technology

The invention relates to the technical field of intelligent manufacturing, in particular to a chain production data monitoring and optimizing system based on industrial internet of things, which comprises a stress load monitoring module, a shock wave propagation analysis module, a vibration feature extraction module, a load optimization control module and a fracture risk early warning module. According to the method, through combination of stress data acquisition and coordinate index and gradient calculation, a transient stress overload area of chain plate stamping and pin shaft heat treatment is positioned, local extreme points are dynamically screened to improve anomaly detection precision, an energy accumulation coefficient is quantified by shock wave propagation speed and attenuation rate, and a vibration anomaly source of a chain pin shaft and a chain plate is associated. The vibration signals are subjected to short-time Fourier transform to analyze riveting and assembling characteristic frequencies, high-resolution stress mode characteristic values are generated to support parameter optimization, operation data are simulated to construct a stress accumulation curve, test parameters are dynamically adjusted in combination with a short-term stress limit to optimize load uniformity, and an impact energy accumulation value is matched with a safety threshold to calibrate load distribution; the fracture risk is reduced.

The invention relates to the technical field of oil and gas exploitation, and discloses a complex well open hole plugging well completion device which comprises a casing pipe, an end socket in threaded connection with the top of the casing pipe, an end socket in threaded connection with the bottom of the casing pipe and an annular sinking groove formed in the side wall of the casing pipe. A rubber sleeve is fixedly arranged at the position, located at the annular sinking groove, of the side wall of the sleeve, a first feeding opening is formed in the position, located below the annular sinking groove, of the inner wall of the sleeve, a pipe groove is formed in the side wall of the sleeve, and the two ends of the pipe groove communicate with the annular sinking groove and the first feeding opening correspondingly; a supporting frame is arranged on the inner wall of the sleeve, a first pressure spring is fixedly connected to the top of the supporting frame, and a movable sleeve is fixed to the tail end of the first pressure spring. The stress limit of the pin shaft and the stress of the connecting sleeve are dynamically calculated through the pump pressure real-time adjusting system, precise closed-loop control of the pump pressure is achieved in combination with a temperature compensation model and pressure drop loss compensation, and the problems of pin failure and pressure overshoot caused by temperature change of a traditional device are solved.

The application discloses a room temperature bending fatigue life improvement and prediction method of a ceramic piece containing microcracks, and belongs to the technical field of mechanical structure strength. The method comprises the following steps: collecting the spatial information of microcracks on an original ceramic piece, testing the power index and critical fatigue life of the original ceramic piece; processing the microcracks into circular holes according to the spatial information of the microcracks, performing a polishing and cleaning process on the circular holes, obtaining a processed ceramic piece, and completing room temperature bending fatigue life improvement; performing size measurement on the circular holes to obtain the radius and cross-sectional area of the circular holes, calculating the stress limit of the processed ceramic piece under the action of static load by using the radius and the cross-sectional area; drawing an S-N curve of the processed ceramic piece by using the stress limit, the power index and the critical fatigue life; and testing the maximum bending stress of the processed ceramic piece, taking the corresponding abscissa of the maximum bending stress on the S-N curve as the prediction result of the room temperature bending fatigue life.

The utility model relates to the technical field of detection equipment, in particular to an anti-falling device of foreign object detection equipment for an FOD runway. The device can buffer instant impact force, the instant stress limit value of the mooring rope is reduced, the occurrence rate of breakage accidents at the connecting position of the mooring rope is reduced, and the device is safer and more reliable. Comprising a supporting mechanism, a detection module and an anti-falling buffer mechanism, the supporting mechanism comprises a mounting chassis, an easy-to-break rod and a supporting rod, the easy-to-break rod and the supporting rod are both of a hollow structure, the easy-to-break rod is provided with an easy-to-break point, the lower end of the easy-to-break rod is connected with the mounting chassis, the upper end of the easy-to-break rod is connected with the lower end of the supporting rod, and the upper end of the supporting rod is fixed to the detection module; the anti-falling buffer mechanism comprises a mounting plate fixedly connected with the mounting chassis, a universal ball fixedly mounted on the mounting plate, a universal seat rotationally connected with the universal ball, a plurality of retaining ropes and a plurality of connecting springs, the retaining ropes are uniformly distributed in the circumferential direction of the universal seat, and one end of each retaining rope is fixedly connected with the edge of the universal seat.

The utility model relates to a safety device, comprising a screw body (10), which has a screw head (36), which is integrally connected to the screw body, as a rotational drive part, and which has a thread (30), which is integrally connected to the screw body, as a fastening part, and which has a bursting device (12), which is arranged in a channel (16) of the screw body (10), the sight glass (20) is completely received as an inspection device (14) together with the bursting device (12) in the channel (16) of the screw body (10) for identifying the state of the bursting device (12). The disclosure also relates to a hydraulic component having a housing with such a safety device. The utility model relates to a safety device, by means of which it is ensured that the bursting device breaks as a safety element when a predefinable pressure limit value is exceeded, as a result of which the channel of the fastening device is filled with a fluid until an inspection device arranged opposite the bursting device "responds" and notifies a failure situation.

The invention provides a method for determining a key threshold value of mass concrete temperature control in a construction period, and belongs to the technical field of constructional engineering.The method comprises the steps that a simulation analysis method is adopted, a mass bottom layer concrete model is established preferentially, and then an upper layer concrete thin-wall structure model is established on the upper surface of the mass bottom layer concrete model; the whole hydration heat process of the upper-layer concrete thin-wall structure model is simulated; a temperature time-varying load is applied to a large-volume underlying concrete model, stress and temperature distribution of an upper-layer concrete thin-wall structure model are obtained, and finally whether a temperature crack occurs or not is judged according to a stress upper limit value. And key threshold values such as a temperature change rate threshold value, an internal highest temperature threshold value and an exterior-interior temperature difference threshold value in the mass concrete temperature control process are obtained. According to the method, a simulation analysis model of the mass bottom concrete-upper concrete thin-wall structure is built, the key threshold value of model temperature control is obtained, and a design basis is provided for temperature control and cracking prevention of mass concrete in the building and maintenance period.

The application provides a steel reinforced concrete structure construction load intelligent monitoring safety early warning system, comprising: a collection module for collecting sensing data of preset sensors arranged on steel reinforced concrete members, a transmission module for transmitting the sensing data to a monitoring module, the monitoring module for obtaining strain information of each steel reinforced concrete member based on the sensing data, judging whether the stress value of each steel reinforced concrete member reaches a stress limit range according to the strain information, and an alarm module for performing alarm work when the stress value of the steel reinforced concrete member reaches the stress limit range, so as to analyze the stress and strain real-time monitoring data of the member, intelligently analyze and alarm in time, and thus take timely and effective emergency measures to avoid safety quality accidents and structural defect damage.

The present invention provides a method for obtaining the strength safety factor of a centrifugal impeller, which solves the problems of the existing calculation method that the solver iterates repeatedly during calculation, takes a long time, occupies a large amount of computing resources, cannot quickly know the safety of the impeller strength, and affects the design efficiency of the impeller. The present invention includes the following steps: step 1) establishing an elastic-plastic finite element calculation model of the impeller; step 2) statistically analyzing the plastic strain limit value; step 3) establishing the relationship between plastic strain and elastic stress; step 4) calculating the elastic stress limit value σ of the impeller lim ; step 5) calculating the elastic stress of the impeller; step 6) calculating the safety factor n; step 7) comparing the safety factor n with a preset value to finally know the safety of the impeller. The present invention combines the elastic and elastic-plastic finite element calculation methods of impeller strength into one calculation method, effectively solving the problems of long time consumption and large computing resource occupation of the elastic-plastic finite element method, thereby improving the design efficiency of the impeller.

The present invention relates to a method for jacking construction of a large-span composite arch bridge with adjustable construction status. The method is characterized in that steel arches, steel beams, hangers, and temporary struts connecting the steel arches and steel beams are pre-assembled on shore into a beam-arch composite system, and the hangers are initially tensioned. During the jacking process of the composite arch bridge with the hangers and temporary struts, a functional function is constructed based on the stress limit of the components, and the construction status during the jacking process is adjusted by optimizing the tensioning force of the hangers. This construction method adjusts the stress state of the composite arch bridge during the jacking process in real time by adjusting the tensioning force of the hangers, thereby ensuring the coordination of the arches and beams to a certain extent, improving the stress performance of the structure, reducing the number of temporary piers in the water and the number of temporary struts for the arches and beams, and reducing the complexity of the structural construction. It has high promotion value in terms of applicability, economy, construction quality, construction period, etc., and has pioneering significance for similar projects in the future.

The utility model discloses a longitudinal negative stiffness measuring device for a steel plate, belongs to the technical field of measuring devices, and solves the problems that in the prior art, when the longitudinal negative stiffness of the steel plate is measured, the steel plate is easy to deform or break excessively, a sample is easy to damage, and equipment operation or personnel are easy to be injured. The steel plate clamping device comprises a base, a clamp arranged on the base and used for clamping a steel plate, a pressure applying structure arranged on the base or the clamp and used for applying pressure to the steel plate clamped on the clamp, and a limiting structure arranged on the base and used for limiting the moving distance of the steel plate. The limiting structure comprises a longitudinal supporting piece and a stress limiting plate arranged on the longitudinal supporting piece. The device is used for measuring the longitudinal negative stiffness of the steel plate.

The invention belongs to the technical field of electronic measuring instruments, and particularly relates to a pressure transmitter for a fluid pipeline. Comprising a strain gauge arranged in a shell, a liquid inlet channel is formed in the shell, a miniature electric control valve is installed on the shell, and a rotating part is arranged on an output shaft of the miniature electric control valve; the rotating part is provided with a communicating hole, a first through hole and a second through hole, elastic rings are fixedly connected in the first through hole and the second through hole, and the elastic rings are fixedly connected with sliding pieces. Liquid pressure is buffered through deformation of the elastic ring and sliding of the sliding piece, when the liquid pressure is close to the pressure limit capable of being borne by the strain gauge, the pressure borne by the strain gauge is reduced, the liquid pressure in the fluid pipeline is calculated by combining the elastic coefficient of the elastic ring and the liquid pressure borne by the strain gauge, and the liquid pressure in the fluid pipeline is calculated. While the damage probability of the strain gauges is reduced, the amplitude of the pressure monitored by the strain gauges is increased, and then the application range of the device is widened.

An embedded straddle-type upper pressure roller structure for a single-end precision milling machine for wooden windows belongs to the field of machining technology. The pressure roller of the embedded straddle-type upper pressure roller and the roller table are arranged vertically opposite each other on the single-end precision milling machine, clamping and feeding the wooden window. This invention uses a spring to connect the embedded straddle-type upper pressure roller and the scissor-lifting platform. This structure changes the range of preload force on the wooden window by changing the type of spring. The spring is easy to replace and has low maintenance costs. By adjusting the type of spring and the height of the scissor-lifting platform, adaptive clamping of wooden windows of different thicknesses or materials can be achieved. The spring spacing adjustment mechanism can independently adjust the compressible stroke and initial pressure of the spring, adjusting the levelness of the embedded straddle-type upper pressure roller to ensure the shape accuracy during wooden window processing. Furthermore, by adjusting the type of spring and the height of the scissor-lifting platform, the stress limit on the wooden window can be further controlled.

The application relates to the technical field of oil and gas exploitation, and discloses a complex well open-hole plugging completion device, which comprises a sleeve, a head threadedly connected to the top of the sleeve and a sealing head threadedly connected to the bottom of the sleeve, an opening is arranged at the bottom of the head, and the device further comprises an annular groove arranged on the side wall of the sleeve, a rubber cylinder fixedly arranged on the side wall of the sleeve at the annular groove, a feeding port one arranged on the inner wall of the sleeve below the annular groove, a pipe groove arranged in the side wall of the sleeve, and the two ends of the pipe groove are communicated with the annular groove and the feeding port one respectively, a support frame arranged on the inner wall of the sleeve, a compression spring one fixedly connected to the top of the support frame, and a moving sleeve fixed to the tail end of the compression spring one. The pump pressure real-time adjustment system dynamically calculates the stress limit of a pin shaft and the stress of a connecting sleeve, temperature compensation models and pressure drop loss compensation are combined, pump pressure precise closed-loop control is realized, and the problems of pin failure and pressure overshoot caused by temperature change of a traditional device are solved.

The invention relates to a height adjusting integrated support and a method. According to the height-adjusting integrated support, in the transverse bridge direction, the abutting limiting relation between a retaining wall and a limiting check block is directly adopted, in the longitudinal bridge direction, the stress limiting relation between the retaining wall, a shear force piece and the limiting check block is adopted, and therefore the limiting strength in the transverse bridge direction is larger than that in the longitudinal bridge direction, and under the normal use working condition, especially under the live load effect, the height of the height-adjusting integrated support can be adjusted. The horizontal displacement of the height-adjusting upper seat plate can be limited through the limiting stop block, so that the stable normal use state of the height-adjusting integrated support is ensured; under the earthquake working condition, the shearing force piece provided with the limiting stop block is sheared off in the longitudinal bridge direction, the guide column plays a role in horizontal rigidity, horizontal displacement between the height adjusting upper base plate and the height adjusting lower base plate is limited, strong earthquake horizontal force is borne, and the safety of a bridge girder is guaranteed. And the intelligent height adjusting system can intelligently adjust the height of the height adjusting integrated support according to the elevation change condition of the bridge girder or the pier top of the bridge pier, the real-time performance is higher, and the safety of the bridge is guaranteed.

The present disclosure provides a data processing device, a bridge stiffness evaluation system, a data processing method, a bridge stiffness evaluation method, a storage medium and a computer program product, which first determines the position-displacement mapping relationship between a plurality of positions of the stiffening beam of the suspension bridge and the lateral displacement under the action of the transverse wind load, then determines the position-stress mapping relationship between the plurality of positions and the stress through the position-displacement mapping relationship and the displacement-stress mapping relationship, then determines the maximum stress position point in the plurality of positions according to the position-stress mapping relationship, and finally determines the transverse deflection-span ratio limit value of the stiffening beam through the operation relationship between the maximum stress position point and the corresponding maximum stress value, the operation relationship between the maximum displacement position point and the corresponding maximum lateral displacement, and the stress limit value of the stiffening beam.

The present disclosure provides a data processing apparatus, a bridge stiffness evaluation system, a data processing method, a bridge stiffness evaluation method, a storage medium, and a computer program product. The apparatus first determines a position-displacement mapping relationship between a plurality of positions and lateral displacements of a stiffening girder of a suspension bridge under the action of a transverse wind load, then determines a position-stress mapping relationship between the plurality of positions and stresses on the basis of the position-displacement mapping relationship and a displacement-stress mapping relationship, then determines a maximum stress position point among the plurality of positions on the basis of the position-stress mapping relationship, and finally determines a transverse deflection-to-span ratio limit value of the stiffening girder on the basis of an operation relationship between the maximum stress position point and a corresponding maximum stress value, an operation relationship between the maximum displacement position point and a corresponding maximum lateral displacement, and a stress limit value of the stiffening girder.

The application provides a force-bearing casing support plate and mounting edge axial distance design method, and relates to the technical field of an aero-engine. The method comprises the following steps: S1, determining the maximum load of the force-bearing casing mounting edge according to a set engine design method; S2, equivalent the force and moment of the maximum load acting on the casing mounting edge to a maximum resultant force F 合 ; S3, taking the material yield limit as the maximum stress limit value of the force-bearing support plate root rounding position, calculating the minimum axial distance l min of the force-bearing casing support plate and the mounting edge according to the maximum resultant force F 合 of the force-bearing casing mounting edge; S4, taking the minimum rigidity of the casing mounting edge as the minimum rigidity of the casing mounting edge according to the maximum resultant force F 合 , calculating the maximum axial distance l max of the force-bearing casing support plate and the mounting edge according to the minimum rigidity. The application can guarantee that the maximum stress level and the minimum deformation of the casing meet the design requirements, and realize the optimal solution of the strength life and the rigidity.

The invention discloses a shape and position control method, device and equipment of a multi-layer heterogeneous spherical shell structure and a preparation method, and relates to the technical field of design of the multi-layer heterogeneous spherical shell structure. The method comprises the following steps: firstly, deducing a working strain interval of each interlayer filling material based on basic parameters of the multilayer heterogeneous spherical shell, and iteratively adjusting a working stress lower limit of each interlayer filling material according to an end face closing condition by considering a load, a stress limit value in a vibration environment and a tangent modulus constraint; and the stress of the whole structure is at the lowest level while the shape and position state control of the structure in a related environment is met.

The invention discloses a fastening bolt and a design method thereof, and belongs to the technical field of bolts, the fastening bolt comprises a bolt head, and the bolt head comprises a first bolt head, a connecting element and a second bolt head; one end of the rod part is connected with one of the first end of the first bolt head and the first end of the second bolt head, the fastening bolt is placed in the internal thread, a tool matched with the first bolt head is utilized to rotate and fasten the fastening bolt, and when the fastening torque reaches a target value, the fastening bolt can be rotated to be fastened. And when the connecting element reaches the stress limit, the connecting element is automatically broken, and the bolt fastening torque is a target value. Meanwhile, the first bolt head falls off, only the second bolt head is left for fastening, and the second bolt head is consistent with a common bolt in form, so that the function of the second bolt head is consistent with that of the common bolt during later disassembly and maintenance, the effect that the bolt is fastened by using a single tool and preset torque can be achieved is achieved, and a special tool is replaced.

The invention relates to the technical field of automobile safety, and particularly discloses an automobile structure safety design method based on multi-attitude simulation, which comprises the following steps: constructing an automobile composite attitude, analyzing and identifying multi-load direction nodes through load path overlapping, and screening failure risk nodes in combination with stress redundancy; calculating a simulation priority based on a failure risk node risk coefficient and a composite attitude historical incidence rate, carrying out simulation positioning of stress exceeding nodes, and dividing types; according to the method, the node optimization type is judged through the standard exceeding proportion, the nodes needing structure optimization are reinforced in combination with the maximum stress standard exceeding degree, differential path adjustment is conducted on the nodes needing path optimization according to the type, and the problems that in traditional automobile structure design, due to the fact that the composite attitude load coupling effect is neglected, the single working condition reaches the standard, and the composite working condition fails are solved; accurate recognition and targeted optimization of the automobile structure risk under the composite posture are achieved, and meanwhile the frequency of later simulation model adjustment and computer and auxiliary equipment repair is reduced.