107 results about "Stress limit" patented technology

A method of identifying perfusion abnormalities in a heart of a patient. The method is performed with a patient stress map including stress values, a patient rest map including rest values, and one or more normal maps. The normal maps may include a normal change limit map including change limits, and a normal stress limit map including stress limits. The stress and rest maps are co-registered with one another and the normal maps. The method includes creating a patient change map by subtracting the rest count values of the rest map from the stress count values of the co-registered stress map. Then, in some embodiments, the patient stress and change maps are jointly compared to the normal stress and change limit maps to detect one or more hypoperfused regions. In such embodiments, the one or more regions detected are identified as having perfusion abnormalities and optionally displayed.

The invention discloses a reliability acceleration test method of electronic products, and belongs to the field of reliability designing and testing. The method comprises steps of firstly presetting an acceleration test temperature change curve boundary according to working stress limit obtained via a routine test for reliability of an electronic product, carrying out simulating calculation of temperature acceleration factors, and modifying and determining initial acceleration test temperature stress change curves; and secondly, calculating vibration acceleration factors according to the initial acceleration test temperature stress change curves and a test profile of the routine test for the reliability of the original electronic product, calculating acceleration test vibration stress change curves according to the vibration acceleration factors, and according to the acceleration test vibration stress change curves, determining the final temperature stress change curves and determining acceleration test time. According to the invention, by following the thought of testing and examining working stress of a product and properly increasing test stress level, test time is shortened; a reliability test of the electronic product can be accelerated; and diversity and controllability of the acceleration factors are achieved.

A method of operating a steam turbine in a combined-cycle power system is provided. The method includes channeling a first amount of steam from a first steam generator to the steam turbine to facilitate powering the steam turbine, generating a second amount of steam within a second steam generator that is coupled in flow communication with the steam turbine, and calculating a predicted stress level within the steam turbine in the event the second amount of steam is channeled from the second steam generator into the steam turbine. An initiation time at which to channel the second amount of steam into the steam turbine is determined such that the calculated predicted stress level will not exceed a predetermined stress limit of the steam turbine. The second amount of steam is automatically channeled from the second steam generator to the steam turbine at the determined initiation time.

A method for automatic evaluation of a finite element simulation for an industrial system such as a motor vehicle body includes predefining an electronic design model of the industrial system and generating finite elements for the model. The stresses occurring in the finite elements are determined using a finite element simulation. Each finite element, which is a two-dimensional element and not a rigid object element and whose stress exceeds a predefined stress limiting value, is determined. For each determined two-dimensional element which is not a triangle, an element limiting value is determined on the basis of the stress limiting value. Each determined two-dimensional element is classified as critical if its computed stress exceeds the established element limiting value. The method enables identification of areas of the industrial system having a high stress and reduces the effect of inaccuracies that occur on the evaluation of the finite element simulation due to the approximation of the vehicle body by finite elements.

A hydraulic system has at least one primary hydraulic functions and a plurality of secondary hydraulic functions all of which are connected in parallel to a supply conduit and a return conduit. A first pressure relief valve prevents pressure in the supply conduit from exceeding a first limit and second pressure relief valve prevents the pressure at the secondary hydraulic functions from exceeding the lower second pressure limit. Novel pressure relief circuits are provided which enable only two pressure relief valves to provide one of two pressure limits at more than two hydraulic functions.

The invention discloses a highly-accelerated stress screening (HASS) method of an anti-skidding brake control box of an aircraft. By using the obtained working stress limit of low temperature, high temperature and vibration of the control box, an initial HASS test profile is established, and a high temperature quantity value, a low temperature quantity value and a vibration quantity value in the initial HASS test profile are lower than the working stress limit; and by using the characteristic that the high temperature quantity value, the low temperature quantity value and the vibration quantity value in the initial HASS test profile are lower than the working stress limit, an HASS test profile is obtained by validating the safety of failure hidden danger which exists in the control box. The method has the advantages that: by performing HASS test on the control box under the working state, a failure can be excited and observed, and the failure hidden danger of the control box can be discovered in a short time; according to test data, a certain defected control box is subjected to failure elimination, and screening time of 80 h is shortened into 2 h; and by tracking and observation,the failure of the control box is timely discovered and then timely eliminated, so that a safe and effective effect is achieved.

A handle (5) for actuating surgical components (45), primarily used in cardiovascular or arthroscopic surgery is a single-piece handle, including an outer portion (10) and an inner portion (15). The inner portion is substantially within the outer portion, and includes an actuating component (50), and a guiding component (55) connected to the actuating component. The actuating component includes a finger grip (65), and a spring force component (70) which biases the finger grip and the guiding component to extend towards a distal tip (35) of the neck (30). A stress limiting component (110) limits stress at a critical point of the spring force component by limiting movement of the spring force component at that point during actuation of the actuating component. The guiding component is adapted for movement along a longitudinal axis of the handle, in response to actuation and release of the actuating component, allowing a surgical component connected to a distal tip (80) of the guiding component to function.

The invention discloses a multi-stress limit determination method for an intelligent ammeter. The method comprises the following steps: determining the sensitive stress of the intelligent ammeter through FMEA (Failure Mode and Effects Analysis); respectively setting the stepping reinforcement stress tests of both temperature and electric stress; testing the output characteristics of the intelligent ammeter; processing the test result; and determining the mechanism consistency condition. The method provided by the invention is specially for determining the mechanism consistency of the intelligent ammeter and makes up the blank that a matched method specially researched and developed for the intelligent ammeter is unavailable in the present market. The conventional reinforcement test data of the intelligent ammeter is less, and can not be analyzed more accurately by adopting a traditional data processing method. The grey theory method provided by the invention can be used under the small-sample poor-information condition, thereby compensating defects when the reinforcement testing data is processed by the traditional method.

The invention provides a method for ensuring the high temperature working stress limit of an airplane antiskid braking control box. The method is used for ensuring the high temperature working stress limit of the control box by applying high temperature stress to the control box step by step. The heating step length for the step-by-step temperature rise of the control box is from 1 DEG C to 10 DEG C, the heating speed rate is from 20 DGE C/min to 60 DGE C/min, the temperature is kept at 5min after each temperature rise value reaches a specified numerical value, the time for balancing the temperature of the control box is remained, a performance test is performed, the test time is 5min, and the sum of the temperature keeping time in each step is 10min; and the high temperature working stress limit of a sample piece is obtained according to the step-by-step temperature rise test method. The method is used for applying working stress to the control box in the test process, and ensuring the initial value of the high temperature working stress limit by ensuring the temperature value during faulting, so that a test method for ensuring the high temperature working stress limit of the control box and ensuring the high temperature fault hidden danger in an accelerating way can be formed.

The invention discloses a method for determining low-temperature working stress limit of an aircraft anti-skid braking control box. The low-temperature working stress limit of the control box is determined by applying low-temperature stress to the control box in a stepped mode with a low-temperature step environment stress test method. In the method, the test time for testing the low-temperature working stress limit of the control box is 6-8 hours; the temperature drop step length is 1-5 DEG C; the temperature drop rate is 25-60 DEG C/minute; the temperature is kept for 5 minutes each time after the temperature is dropped to a specified value; the time for temperature balance of the control box is reserved; then performance test is performed, and the test time is 5 minutes; and the sum oftemperature keeping time at each step is 10 minutes. The low-temperature working stress limit of a sample is obtained according to such stepped temperature drop test method. Since the failure of the control box occurs in a working process, application of working stress in the test process of dropping the temperature by using the stepped method more facilitates excitation and observation of the failure; and a test method capable of quickly determining the low-temperature failure hidden trouble of the control box and determining the low-temperature working stress limit of the control box is formed.

The invention provides a novel extreme outer pressure test device for a hemispherical concrete shell. The novel extreme outer pressure test device comprises a fixed supporting cover, a capsule, a pressurization device, a deformation detection device and a data acquisition processing device. Therefore, the pressurization device is used for pressurizing the capsule; under the supporting of the fixed supporting cover, the capsule uniformly applies expansion pressure to the outer surface of the hemispherical concrete shell; the pressurization device pressurizes the capsule until the capsule is damaged and transmits a pressure signal to the data acquisition processing device; the deformation detection device detects the deformation of the hemispherical concrete shell and transmits a deformation signal to the data acquisition processing device; the data acquisition processing device performs analytic processing on the respective signals to obtain an outer pressure extreme of the hemispherical reinforced concrete shell and a relation between outer pressure and a damage mode. Compared with the prior art, the novel extreme outer pressure test device can forecast a possible damage mode of the hemispherical concrete shell by repeatedly detecting the hemispherical concrete shells which have different thicknesses and different radiuses and consist of different steel bars. The invention also provides a test method based on the device.

The invention discloses a method for determining the vibration working stress limit of an aircraft anti-skidding braking control box. the method comprises the following steps: applying vibrating stress on a control box in a stepping manner to determine the vibration working stress limit of the control box, wherein the step size of the vibration stress applied in a stepping manner is 1-5Grms; the state is kept for 5min every time stepping vibration reaches a specified value to reserve time for vibration stress balancing of the control box, and then a test is performed and lasts for 5min, and the total amount of vibration maintaining time in each step is 10min; and obtaining the vibration working stress limit of a sample piece by using the stepping vibration testing method. According to theinvention, a method that working stress is applied to the control box in the testing process is adopted, and a fault vibration value is determined in time by tracking and observing. If the vibration amount value does not satisfy a design requirement, an improvement advice focused on the vibration performance is proposed. If the vibration amount value satisfies the design requirement, the vibration amount value is taken as an initial value of the vibration working stress limit.

The invention discloses a method for predicting maximum height of a filling mining diversion fissure zone. Supposing a precondition that no caving zone is generated and only a fissure zone and a sagging zone are generated in the advancing process of a working face, a mathematical model which is used for predicting the maximal height of the filling mining diversion fissure zone; a critical value of top board deformation is used for determining the strata failure low of an over-limit stress limited space; and whether the strata fails is determined according to the critical value of the top board deformation. Therefore, compared with the prior art, the method has advantages of more direct calculation and higher convenience. A calculation formula for predicting the maximum height of the filling mining diversion fissure zone can be simply and accurately obtained. Furthermore the parameters in the formula can be easily acquired, and higher accuracy of the calculation process can be realized. Simple and direct calculation can be obtained. The method can quickly, effectively and accurately predict the maximum height of the diversion fissure zone and is suitable for guidance for actual production, thereby realizing safe mining under water body.

Providing a steam turbine power plant that can be safely activated at a high speed while maintaining thermal stress at a level equal to or lower than a limit in consideration of operational results of the plant, and a method for activating the steam turbine power plant. The steam turbine power plant includes a life consumption amount calculator 22 configured to calculate life consumption amounts of a turbine rotor based on a value measured by a measurer 11, 12, a life consumption amount storage device 23, a thermal stress limit update timing determining device 24 configured to determine a time when thermal stress limits are updated, an accumulated life consumption amount calculator 25 configured to calculate accumulated life consumption amounts of the turbine rotor when the thermal stress limits are updated, a planned life consumption amount setting device 26 configured to set planned life consumption amounts of the turbine rotor based on the accumulated life consumption amounts of the turbine rotor, a thermal stress limit calculator 27 configured to calculate and update the thermal stress limits based on the planned life consumption amounts of the turbine rotor, and a plant command value calculator 28 configured to calculate a plant command value based on the thermal stress limits.

The invention relates to the technical field of a composite material, and particularly relates to a glass fiber reinforced engineering plastic plate. The engineering plastic plate is mainly prepared from two-way longitude and latitude glass fibers, and engineering plastic injected between the two-way longitude and latitude glass fibers. The invention also relates to the technical field of shock insulation, and particularly relates to a high-damping isolating bearing. By adopting the simple high-damping isolating bearing, common laminated rubber medium steel plate is replaced by using the engineering plastic plate, the simple high-damping isolating bearing is low in price, simple in construction technology, and applicable to broad rural areas with relatively weak economy and technique, and the compressive stress limit is smaller than that of a laminated steel pate rubber bearing.

The invention discloses a novel inner pressure limit test device for a concrete hemispherical shell. The novel inner pressure limit test device comprises a capsule, a blocking device, a pressurizing device, a deformation detection device and a data collecting and processing device. According to the novel inner pressure limit test device, the pressurizing device is utilized for pressurizing the capsule until the capsule is destroyed and transmitting a pressure signal to the data colleting and processing device, the capsule is used for uniformly applying an expansion pressure to the inner surface of the concrete hemispherical shell, the deformation detection device is used for detecting the deformation of the concrete hemispherical shell and transmitting a deformation signal to the data collecting and processing device, and the data collecting and processing device is used for analyzing the signals to obtain an inner pressure limit of the concrete hemispherical shell and a relation between an inner pressure and a destruction form; compared with the prior art, the novel inner pressure limit test device is utilized for repeatedly detecting steel reinforced concrete hemispherical shells with different thicknesses and radiuses and can be used for predicting the possible destruction form of the concrete hemispherical shell. The invention further discloses a test method based on the test device.

The invention relates to a pushing construction method for a large-span composite arch bridge with adjustable construction state, which is characterized in that a steel arch, a steel beam, a hanger and a connecting steel arch, a temporary strut of a steel beam are assembled into a beam-arch composite system on the shore in advance, and the suspension rods are pretensioned. In the process of pushing the composite arch bridge with suspension rods and temporary struts as a whole, the construction state is adjusted by optimizing the tension of suspension rods based on the structural function of component stress limits. The construction method adjusts the stress state of the composite arch bridge in real time by adjusting the tension of the suspension bar, to some extent, it ensures the cooperation of arch and beam, improves the mechanical performance of the structure, reduces the number of temporary piers and arch beam temporary struts in water, reduces the complexity of the structure construction, and has high popularization value in applicability, economy, construction quality, construction period and other aspects, which is of pioneering significance for similar projects in the future.

The invention discloses a reinforcement method of a concrete deep beam, and aims at improving the reinforcement correctness of the concrete deep beam. The reinforcement method comprises the following steps: S101, determining a disordered area and a non-disordered area of the concrete deep beam according to a saint venant principle; S102, constructing an equivalent strut-and-tie model for the disordered area of the concrete deep beam; S103, determining the internal forces of a strut bar and tie bar in the strut-and-tie model; S104, reinforcing the disordered area of the concrete deep beam according to the internal force of the tie bar and stress limiting value of a reinforcing steel bar; S105, determining the stresses of the strut bar in the reinforced strut-and-tie model and a knot; S106, judging the stresses of the strut bar and the knot are in a corresponding set range, if both the stresses of the strut bar and the knot are in the corresponding set range, executing the step S107, and if the stresses of the strut bar and/or the knot are not in the corresponding set range, executing the step S102; and S107, finishing the reinforcement.

The invention relates to electronic equipment detection technology, and discloses a method and device for realizing quick stress screen of a product. The method comprises the following steps of: theoretically deducing to obtain theoretical reliability limit of the product; actually measuring whether the product meets a theoretical value through a test; finding out a weak point (potential failure) of the product in the actual measurement and gradually improving and eliminating to reach the theoretical design limit; and derating the theoretical design limit as the quick stress screen condition for the product. The embodiment of the invention provides the method for realizing quick stress screen of the product. The product is verified and improved to reach the theoretical stress limit by designing and calculating the theoretical stress limit of the product and then gradually applying step stressing actual test; the design limit is tested and verified according to theoretical calculation and is derated and screened; and thus, a part of failure can be screened without damaging more reliability of the product.

The invention discloses a throwing glass breaking ball. The throwing glass breaking ball comprises a body, and a plurality of bulges arranged on the outer surface of the body, and the bulges are the members with the hardness higher than the hardness of the tempered glass. When the glass breaking operation is required, the glass breaking ball can be thrown into the tempered glass by hands or usinga device, because the hardness of the bulges on the glass breaking ball is higher than that of the tempered glass, and when the bulges hit the glass surface, the stress limit of the tempered glass surface is broken through, the tempered glass is broken, and the glass breaking purpose is achieved. When the glass breaking ball is used for breaking the glass, because the bulges are arranged on the outer surface of the body, the glass breaking can be achieved without the high throwing speed through the shape bulges making contact with the glass, and the advantages of being high in efficiency, lowin impact speed and high in safety are achieved; and the long-distance glass breaking can be achieved through a throwing way, and when the glass breaking rescue is needed during the fire in high-risebuildings and other, the personnel safe rescue and rapid rescue can be achieved.

A refrigerator having a carbonated water production device, according to one concept of the present invention, comprises: a pressure regulator for adjusting and emitting the pressure of carbon dioxide emitted from a carbon dioxide cylinder; a solenoid switch valve for controlling the supply of the carbon dioxide discharged from the pressure regulator to a carbonated water tank; a connection channel for connecting the pressure regulator and the solenoid switch valve; and a relief valve arranged in the connection channel so as to discharge the carbon dioxide of the connection channel to the atmosphere if the pressure of the carbon dioxide of the connection channel is greater than a predetermined pressure limit. Thus, the pressure of the carbon dioxide of the connection channel is capable of being maintained at a predetermined pressure limit or less, and solenoid malfunction can be prevented so as to improve reliability and stability of a system.

The invention relates to a device for decoupling a bearing bracket in a turbomachine, said bearing bracket having an upstream part and a downstream part respectively comprising a plurality of upstream holes and downstream holes through which stress-limiting screws pass, which device comprises, between each upstream hole and the stress-limiting screw that passes through it, a clearance that prevents any contact between the upstream hole and the stress-limiting screw, and is a device wherein the upstream part and the downstream part of the bearing bracket are in mutual contact via surfaces that form a dual centering means.