138 results about "Time stress" patented technology

The invention relates to a high temperature creep life accelerated test method of a material, which comprises: a plurality of groups of short time stress relaxation tests of the material at the same temperature, acquiring a relaxation rate-stress curve based on the numerical differentiation principle, forming a relaxation creep rate-stress curve by utilizing a relaxation equation, calculating creep data to build a creep curve, and building a steady state creep rate curve and a Norton creep equation. The method starts from the physical relation between relaxation and creep, covers rather broad properties of creep strain rate by utilizing the short time relaxation process, and educes broader creep data than that educed from general creep tests by above ten times, thereby effectively reducing the amount of high temperature creep tests and time of tests and providing basic data for development of new material and engineering application.

The invention relates to a dynamic soft reduction method for detecting the tail end of a solidified liquid core of a casting blank based on pressure feedback, belonging to the technical field of metallurgy continuous casting control. The method comprises the following steps of: firstly, establishing a control platform for remotely and automatically adjusting roll gaps of all sector sections on a continuous casting machine, and calculating the stress of the casting blank in different sector sections by utilizing the detection result of pressure sensors installed on all the sector sections; detecting the stress difference of the casting blank in each sector section during roll gap variation by changing the roll gap contraction size of each sector section; judging the position of the tail end of the solidified liquid core of the casting blank according to the stress difference between the casting blank with the liquid core and the casting blank without the liquid core; and finally, dynamically adopting different reduction quantities in all sector sections of a casting machine by using a soft reduction control system according to the position of the tail end of the liquid core judged by the method. The method for judging the tail end of the solidified liquid core of the casting blank is directly obtained by calculating the real-time stress of the casting blank. Because the calculation of casting blank surface temperature and blank shell thickness does not need a large quantity of mathematical models, the calculation method is simple and effective and ensures the stability and the execution efficiency of a casting machine control system.

The invention discloses a dangerous and old building monitoring system based on the Beidou positioning technology. The dangerous and old building monitoring system comprises a, an inclination and settlement monitoring module which is used for extracting the inclination characteristic quantity of the monitored house building in real time; b, a crack monitoring module which is used for monitoring the crack width of the monitored house building in real time; c, a stress-strain monitoring module which is used for performing real-time stress-strain characteristic quantity monitoring on the monitored house building; d, a dynamic characteristic monitoring module which is used for monitoring the change of the dynamic characteristic after internal damage of the monitored house building; e, an information processing module which is used for receiving the monitoring data outputted by the inclination and settlement monitoring module, the crack monitoring module, the stress-strain monitoring moduleand the dynamic characteristic monitoring module; f, a BDS positioning system; g, an auxiliary monitoring module; h, a central processing module; i, an intelligent analysis cloud platform; and j, a client side module. The advantages are that safety warning of the dangerous and old building can be realized.

The invention relates to a tooth orthodontic correction material which comprises the following components based on the total weight of the correction material: (A), 50-90wt% of polyethylene glycol terephthalate-1,4-cyclohexane dimethyl alcohol ester; (B), 5-45wt% of polycarbonate; and (C), 5-45wt% of thermoplastic polyurethane, wherein the sum of the percentage contents of all components of the correction material is 100wt%. The invention also relates to a preparation method of the tooth orthodontic correction material and application of the tooth orthodontic correction material used for manufacturing a tooth orthodontic correction device. The tooth orthodontic correction material disclosed by the invention has high transparency and excellent low-stress relaxation rate and can provide long-time stress and long-lasting correction effect.

The invention relates to a red high-brightness elastic stress luminescent material and a preparation method thereof. The preparation method is characterized in that a red high-brightness elastic stress luminescent material (Ba, Ca) TiO3:Pr<3+>, Re<3+> (Re<3+> is one or more of Y<3+>, La<3+>, Nd<3+>, Gd<3+>, Yb<3+> and Lu<3+>) is prepared by taking a complex-phase (Ba, Ca) TiO3:Pr<3+> material as a matrix and using a method for co-doping one or more of trivalent rare earth ions Y<3+>, La<3+>, Nd<3+>, Gd<3+>, Yb<3+> and Lu<3+> and a trivalent rare earth ion activating agent Pr<3+>. The red high-brightness elastic stress luminescent material and the preparation method thereof have the advantages: (1) the preparation method of the material is simple, easy to operate and low in equipment requirement; (2) the prepared material (Ba, Ca) TiO3:Pr<3+>, Re<3+> is relatively strong in elastic stress luminescence, clear and macroscopic in elastic stress luminescence brightness at dark places, rapid in stress luminescence afterglow attenuation, free of macroscopic stress luminescence glows and stress tracks and capable of being widely applied to the fields such as real-time stress distribution detection, stress sensors, displays, entertainment devices and the like for living bodies, mechanical parts, buildings and the like; (3) the raw materials Ba, Ca and Ti of a material system are all rich elements on the earth and belong to environment-friendly materials.

The application discloses a rapid starting control method and a rapid starting control system for a steam turbine of a combined cycle generating unit. Because the starting speed of the steam turbine is constrained by the stress level of a rotor of the steam turbine, under the condition that the stress of the rotor does not exceed a maximum stress range, the starting curve of the steam turbine is adjusted according to real-time stress received by the rotor, the heating time of the steam turbine is shortened, moreover, the steam turbine is heated under low load, consequently, the steam turbine is started rapidly, and the purpose of generating more electricity and saving energy in the process of starting is achieved.

The invention provides a tensional cable assembly applied to a flexible pressing and releasing device of a spacecraft. The tensional cable assembly comprises a rope, block pins clamped to the two ends of the rope, a movable end, a fixed end and fasteners, wherein the movable end and the fixed end are arranged at the two ends of the rope correspondingly, and the two block pins at the two ends of the rope are arranged in the movable end and the fixed end correspondingly; the fasteners are arranged in the movable end and the fixed end correspondingly. Compared with the prior art, the tensional cable assembly has the beneficial effects that 1, the high-strength fiber rope can be effectively fixed to the movable end and the fixed end; 2, under the condition of long-time stress, the rope cannot be dragged out from the fixed end and the movable end; 3, external connectors are simple, and assembling is convenient.

The invention provides a structural member residual strength assessment method based on multi-factor fusion correction. The method includes the following steps that finite element software is used for conducting finite element analysis on a to-be-tested structural member, and the most easily broken position, the maximum stress value and stress state distribution near the position with the maximum stress value of the to-be-tested structural member are obtained; a fatigue test is conducted on the to-be-tested structural member, and the fatigue life under the maximum stress value condition is obtained; the real-time stress value of the most easily broken position of the to-be-tested structural member under the actual working condition is measured; a stress concentration correction coefficient is obtained; the dimension correction parameter of the to-be-tested structural member is calculated; the surface quality correction parameter of the to-be-tested structural member is obtained; the residual strength of the to-be-tested structural member is calculated finally. The method takes all factors capable of affecting the damage state of the structural member into account, wherein the factors refer to the fatigue life of the structural member, stress concentration, stress distribution conditions, a manufacturing process, the surface strength and the like; the problem that in the prior art, factors taken into account are singular is effectively solved, and the accuracy of an assessment result is greatly improved.

The invention discloses an ice-coated electric transmission line weak link early warning method. The ice-coated electric transmission line weak link early warning method comprises the following steps that firstly, weather forecast information, ice-coating information and electric transmission line information are determined; secondly, the real-time stress values of grades in a tension support section are solved based on an accurate model stress calculation model of an electric transmission line wire, and the unbalanced force received by a pole tower is worked out; thirdly, the numerical relationship between the real-time stress values and the limiting stress value is analyzed, wire early warning is carried out according to grades, the unbalanced force of the pole tower and the limiting unbalanced force are compared, and pole tower early warning is carried out according to grades. By means of the ice-coated electric transmission line weak link early warning method, the broken electric transmission line wire can be intelligently judged when an electric system is in an ice-coating period. Information is comprehensively collected, stress values of all the grades of the line are measured through a ruling span calculation model and the accurate stress calculation model, and therefore whether the line faces the line broken risk or not can be accurately judged, and the defects that a traditional judging method is not direct and is low in precision and long in consumed time can be avoided.

The invention, which belongs to the dynamic strain measurement technology field, relates to a real-time strain measurement apparatus for stamping and forming and a test method thereof. The real-time strain measurement apparatus comprises a static strain indicator, leads, foil gauges and a die. The foil gauges are fixed on test points and are connected with the static strain indicator through leads; besides, the die comprises a punch die and a female die; and a groove that is used for placing the foil gauges is arranged at positions of the female die, wherein the positions are corresponded to the test points. When real-time strain measurement on stamping and forming is carried out, different deformation portions of a workpiece and portions having different strain characteristics are utilized as test points of a sheet metal; the foil gauges are pasted; the foil gauges of the apparatus and the connecting leads are placed in the groove; the connecting leads are led out by the groove; and on the basis of utilization of a step-by-step stamping method, a real-time stress strain value is measured and obtained. According to the invention, the structure of the apparatus is simple and reasonable; it only needs to improve a die, so costs are low; and the apparatus has strong practicability; besides, the test method is simple and rapid; and during the part stamping stroke, it is convenient to measure a strain value.

The invention provides a monitored wristband, monitoring wristband equipment and an abnormal emotion monitoring system and method. The monitored wristband collects real-time stress physiological parameters produced when a wristband wearer answers the question put forward by a questioner each time, an abnormal emotion evaluation machine judges whether the current emotion of the wristband wearer is abnormal according to the baseline state physiological parameters and the real-time stress physiological parameters, when it is monitored that the current emotion is abnormal, vibration prompt messages are sent to all monitoring wristbands, and all monitoring wristbands send corresponding vibration according to the vibration indication manners in the vibration prompt messages after receiving the vibration prompt messages. According to the technical scheme, an efficient abnormal emotion detection scheme is provided, vibration can be triggered when the abnormal emotion is detected, the abnormal emotion phenomenon can be reminded effectively, and the questioner can put up more effective follow-up questions.

The invention discloses a construction method for bent cap hoop support integral detachment. The method includes the following steps that S1, pressure bearing devices are installed; S2, steel wire ropes are installed; S3, first-time stress system conversion is conducted; S4, second-time stress system conversion is conducted; and S5, a support vertically descends to the ground. By the adoption of the construction method for bent cap hoop support integral detachment, through two times of stress system conversion, the hoop support integrally and vertically descends to the ground to be disintegrated and detached, plenty of upper air operation and hoisting lifting operation are reduced, the detaching efficiency of the bent cap hoop support is improved, and safety of constructors is guaranteed.

A spacecraft fragment meteorite landing area forecasting method comprises the following steps of establishing a basic pneumatic database according to a current spacecraft to be processed or fragment,wherein the basic pneumatic database comprises a basic static pneumatic database and a basic dynamic pneumatic database; storing aerodynamic force and torque data corresponding to the flight conditions in a basic static pneumatic database; storing pneumatic derivative data corresponding to the flight conditions in a basic dynamic pneumatic database; obtaining the real-time aerodynamic force data through interpolation from the basic static aerodynamic database, obtaining the aerodynamic derivative data of corresponding conditions through interpolation from the basic dynamic aerodynamic database, and obtaining the real-time stress data of the spacecraft or the fragments through calculation; and performing six-degree-of-freedom trajectory simulation according to the determined real-time stress data of the spacecraft/fragment, determining the meteorite trajectory of the spacecraft or fragment, and further determining the meteorite region of the spacecraft or fragment.

The invention relates to a method and equipment for evaluating the technological property of bolt installation, and the method comprises the steps: determining the fastening sequence of bolts; testing the total pulling force of bolts in an operation process under the condition of different loads; obtaining a real-time stress amplitude value; making a conclusion that an end face of a connected part is cracked when the real-time stress amplitude value is greater than a standard stress amplitude value; and determining the fastening sequence of new bolts till the fastening sequence of the current bolt is judged to be the optimal bolt fastening sequence. The equipment comprises a signal input end module, a signal collection and processing module, and a man-machine interaction module, wherein the signal input end module comprises a strain signal input end, a standard analog input end, and a power circuit. The signal collection and processing module comprises a processing chip. The man-machine interaction module comprises a processor, a communication interface, an operation module, and a display module. The method and equipment can test the bolts, propose a new installation technology, and facilitate the maintenance of the bolts.

The invention discloses a stress testing device for a brake adjuster, and belongs to the technical field of stress testing of the brake adjuster; the invention aims to provide a device for testing a real-time stress condition and a starting force on the brake adjuster. The device comprises a bracket, a bearing plate, an adjusting rod, a guiding rod, a belleville spring and a force sensor. The device is structurally characterized in that the bearing plate is arranged in front of the bracket, two guiding rod locating holes are arranged in the bearing plate, and adjusting rod locating holes are arranged in four corners on the bearing plate; the adjusting rod, the force sensor, the guiding rod and the belleville spring are arranged between the bearing plate and the bracket; the belleville spring is sleeved on the guiding rod, a front section of the guiding rod is sleeved in the guiding rod locating holes; the force sensor is fixed on the bracket, and is arranged right behind the guiding rod and is in close contact with the guiding rod; the adjusting rod comprises a front part, a middle part and a rear part, wherein the front part is sleeved in the adjusting rod locating holes in the bearing plate and the rear part is fixed with the bracket; the device is mainly applied to the stress testing of the brake adjuster.

A beat assisted temporal pressure password authentication method in which a user enters a password by pressing a touch interface, and holding the pressure within one of multiple pressure ranges for passing certain number of beats, for one or more times. A password is then produced as a sequence of the pressure range code and the count of the beats passed in that pressure range.

The invention relates to an ultra-large mud pump shaft L-shaped sealing element rubber which is prepared from butadiene-acrylonitrile rubber 220.240, sulfur, accelerator, peroxide, auxiliary crosslinking agent, nano zinc oxide, zinc stearate, anti-aging agent, carbon black, process oil DOP and microcrystalline wax. The invention has the advantages of high wear resistance, high strength, high pressure resistance, shock resistance and deformation resistance, and is superior to the foreign products; the service life is obviously prolonged, reaching 300 days; the performance indexes are far beyond the Chinese Standard; especially the compression deformation, which is the elastic recovery capacity after long-time stress of the rubber material, is the main index for judging the sealing property; and the Chinese technical level of the compression deformation is just or slightly beyond the Chinese Standard, but the compression deformation of the invention is down to 10 below.