135results about How to "Predicted service life" patented technology

The invention provides a monitoring system for monitoring durability deterioration evolution of a reinforced concrete structure. The monitoring system comprises a temperature sensor for measuring the internal temperature of concrete, a humidity sensor for measuring the internal humidity of the concrete, a pH sensor for measuring the pH value of the interior of the concrete, a chloride ion sensor for measuring the chloride ion concentration in the concrete, an oxygen sensor for measuring the oxygen concentration in the concrete, noble electrodes, a steel bar electrode, a solid-state reference electrode, an RFID device for radio frequency monitoring, and a stainless steel tank for storing the sensors and the electrodes. The monitoring system can predict the corrosion state of steel bars and predict the service life of the reinforced concrete structure more accurately, and can position the sensors more easily.

The invention discloses a method for predicting a service life of a rubber shock absorber; the method comprises the steps: combining aging factors, influencing the use of the rubber shock absorber, and fatigue factors; firstly, establishing an aging service life prediction mathematic model of the rubber shock absorber in use of a hot air accelerated aging test; secondly, establishing a model relationship between static rigidity of a new absorber and fatigue times by means of the aging service life prediction model and the existing performance parameter of an old absorber; further, establishing a relation model between the static rigidity and the time and obtaining a service life prediction model of the rubber shock absorber, thereby realizing prediction of the service life of the rubber shock absorber. The aging factors and the fatigue factors are combined well to predict the service life of the rubber shock absorber, and the prediction precision is high.

The invention discloses an evaluate method on the abrasion condition of the cable of stayed-cable bridge, comprising that (1) detecting the application condition of cable, (2), accelerating simulating test of cable, to obtain a time-abrasion time-effect curvature in special application condition, (3), based on the result of abrasion-safety simulation analysis, completing the cable abrasion evaluation and service life prediction. Based on prior art, the invention uses accelerated abrasion simulation test, to obtain the abrasion rule of cable, uses simulation analysis to evaluate the abrasion state and predict service life, and provides practical technique.

The invention discloses a back propagation (BP) neural network based method for predicting service life of a rubber absorber. According to the method, a BP neural network model of aging life of the rubber absorber is created firstly; according to the created BP neural network model of the aging life of the rubber absorber as well as fatigue life, a BP neural network model of the service life of the rubber absorber is created; and finally, the service life of the rubber absorber is predicted through the BP neural network model of the service life. In the method, aging factors and fatigue factors affecting the use of the rubber absorber are combined, a service life prediction model of the rubber absorber is reasonably created, the service life of the rubber absorber affected by both aging and fatigue is accurately predicted, and the defect of inaccurate prediction of service life of the rubber absorber due to separate research of aging life and fatigue life is overcome.

The invention discloses a wear prediction method for a shield tunneling hob. The wear prediction method for the shield tunneling hob comprises the following steps that a unit displacement wear loss caused by a plastic removal mechanism, a unit displacement wear loss caused by a brittle fracture mechanism, a unit displacement wear loss caused by adhesive wear, a unit displacement wear loss caused by fatigue wear, a rock breaking arc length generated when a point on the front side of the hob rotates by one circle, a spatial rock breaking arc length generated when a point on the side face of thehob rotates by one circle, a normal cutting force of the hob, and a horizontal force borne by the hob are acquired; the radial wear and wear size of the front side of a hob ring caused when the hob rotates by one circle are worked out; the wear loss and wear size of the side face of the hob ring caused when the hob rotates by one circle are worked out; the four wear losses are multiplied by corresponding fitting coefficients, and the products are added to obtain the wear size of the front side and the wear size of the hob ring; and a wear prediction model is generated, and the wear is predicted. By the adoption of the wear prediction method, the service life of the shield tunneling hob can be predicted, the prediction precision can be improved, and the problems of severe wear of the hob and frequency opening of a bin are solved.

LED-lamp accelerated-life on-line detection equipment belongs to the reliability detection field of a semiconductor device. In order to solve a problem in the prior art, the invention provides the equipment. The equipment comprises a test box body, a lamp clamp apparatus, an external connection integrating sphere system, a control host and a computer, wherein the test box body comprises an optical measurement channel and a temperature applying unit; the optical measurement channel is located at a connection position of the test box body and the external connection integrating sphere system; the lamp clamp apparatus is arranged in the test box body and is a positive-negative 360-degree rotary type multi-station independent lamp bracket; a detected LED lamp sample is installed on the lamp clamp apparatus; the external connection integrating sphere system is tightly connected to the test box body and there is no light leakage, and a thermal-insulation vacuum-pumping double-layer glass tube is arranged in the external connection integrating sphere system; the control host is connected to the test box body, the external connection integrating sphere system and the computer through a data line respectively and is used for controlling setting of an acceleration temperature of the test box body and setting of a test parameter of an external connection integrating sphere; and the computer is used for displaying on-line data of the control host in real time. By using the equipment, performance of a LED lamp product can be rapidly shown.

The invention discloses a fractal dimension representation method for an expansion trend of a corrosion fatigue crack of a gas pipeline. The method comprises the steps of firstly cutting an L360 pipe wall material and preparing a CT sample; secondly, carrying out pre-fatigue noise testing and fractal dimension calculation on the pipe crack; thirdly, carrying out corrosion fatigue testing on the CT sample on a fatigue machine; finally carrying out noise testing on the corrosion fatigue crack and calculating a fractal dimension, wherein the expansion trend of the fatigue crack of the gas pipeline can be reflected according to the fractal dimension change of the crack noise calculated before and after the fatigue. Low-frequency noise testing and calculation are carried out on the sample, and the sample is not destroyed by the behavior, so that the method is a nondestructive testing means, and furthermore, the test can be carried out on most of metal pipes, and has relatively wide applicability.

The invention discloses an experimental device applied to simulating a high-temperature fused salt washout environment. The experimental device comprises an air compressor, a rotor flow meter, a spray gun, a material storage tank, a sand blasting box, a test sample frame, an electromagnetic heater, an angle gauge and a water tank, wherein the air compressor is connected with the rotor flow meter through a pressure-resistant flexible pipe, the rotor flow meter is connected with the spray gun through a pressure-resistant flexible pipe, the material storage tank is arranged above the spray gun and communicated with the spray gun, a nozzle integrally connected with the spray gun is arranged in the sand blasting box and close to the front end of an inlet of the sand blasting box, the test sample frame, the electromagnetic heater and the angle gauge are all arranged in the sand blasting box, the test sample frame is fixedly arranged in the middle position of the sand blasting box, the test sample frame is provided with a movable guide rail, the electromagnetic heater and the angle gauge are arranged above the test sample frame, a test sample is placed on the electromagnetic heater, the angle gauge is used for adjusting the angle direction of the test sample, and the water tank is communicated with the sand blasting box through a water pipe. The experimental device disclosed by the invention has quick temperature rise speed and good thermal insulation effect; furthermore, adjustable variables can be used for predicting service life of a coating layer by accelerating corrosion.

The invention discloses a marine cable aging performance testing method. The marine cable aging performance testing method comprises the following steps: selecting two common marine cables, namely, anethylene propylene rubber insulation cable and a natural butadiene styrene rubber insulation cable; carrying out a thermal aging test on the cables at the temperatures of 120 DEG C, 140 DEG C and 160DEG C; carrying out a direct-current voltage-withstand test on the aged cable, and measuring the leakage currents and the insulation resistance of the cable in air and water; carrying out judgment and statistics on the changes of the measured leakage currents and insulation resistance of the cable; analyzing the service life trend of the cable by measuring the mechanical performance of the cable;measuring the tensile strength and the breaking elongation rate of the aged cable by using a stretching instrument according to analyzed data; analyzing and arranging measured data, carrying out screening through a comprehensive comparison method, selecting the change trend with the high breaking elongation rate, and selecting and using an evaluation parameter which serves as the service life ofthe cable; and comparing the selected evaluation parameter with the national standard and the actual application, thereby judging whether the cable can continue to work continuously or not.

The invention discloses a device and a method for measuring humidity physical properties of porous materials. The device comprises a high-humidity test cabinet, a low-humidity test cabinet, a saturation system, a temperature control system and a data acquisition system. The device and the method have the advantages that the problems of deterioration of the heat-insulation performance of existing porous materials and diversified adverse effects due to accumulation of moisture in service procedures can be solved by the aid of the device and the method; the device for measuring the humidity physical properties of the porous materials comprises a system for testing water vapor effective diffusion coefficients and isothermal moisture absorption curves of the porous materials under the conditions of different temperatures and different types of relative humidity, accordingly, the water vapor effective diffusion coefficients and the isothermal moisture absorption curves of the porous materials under the conditions of the different temperatures and the different types of relative humidity can be obtained, the humidity physical properties and heat and moisture coupled transfer conditions of the porous materials can be comprehended, service conditions of the porous materials under different working conditions can be ultimately estimated, the service lives of the materials can be predicted, and unfavorable effects due to excessively high humidity can be prevented.

A porous-medium premixing combustor is provided, which includes: an air-fuel gas mixer, a combustor body, a thermocouple, an ignition electrode, and a detecting electrode. The combustor body includes a casing connected to the air-fuel gas mixer; an outer and an inner burner-block, wherein the outer burner-block and the casing are connected, forming a square chamber, and the inner burner-block is provided inside the square chamber, with a via hole communicating with a pipe; and a mixed gas distributing plate, an ordered porous plate, a small-pore foamed ceramic plate, and a big-pore foamed-ceramic plate sequentially provided along an axis direction of the via hole of the inner burner-block. The thermocouple is provided at the casing and extends into the square chamber. The ignition electrode is provided close to an end of the big-pore foamed-ceramic plate. The detecting electrode is provided close to an exit end of the big-pore foamed-ceramic plate.

The invention discloses a polymer-based composite fatigue life prediction method based on mesomechanics. The performance research object of a polymer-based composite is determined, and the performanceresearch object comprises fibers, a base and a fiber-base interface; according to the constitutive relation and the S-N curve of the performance research object, an equivalent volume unit model is repeatedly stacked to construct an equivalent regular fiber array; the multi-axis time-varying mesoscopic stress of the polymer-based composite laminate under the action of the static load and the fatigue load is determined by utilizing the unit body model; the given mesoscopic stress of each performance research object is converted into an equivalent average stress and an equivalent stress amplitude; according to the equivalent average stress and the equivalent stress amplitude, the cycle index of fatigue failure is obtained in combination with a creep rupture kinetic model, and an equivalent life diagram is established for predicting the creep/fatigue life. The method is beneficial for people to effectively predict the service life of the equipment made of the polymer-based composite, so that the method has guiding significance for normal and efficient use of the equipment.

The invention relates to the technical field of a friction material for a clutch and in particular provides a method for constructing a three-dimensional abrasion map of a copper-based powder metallurgy wet friction material. The method comprises the following steps: (1) carrying out friction-wear testing on the copper-based powder metallurgy wet friction material processed into a narrow band by use of a disc-to-disc friction braking testing machine according to the similarity principle to acquire the primary data of the material; (2) performing numerical treatment on the primary data to obtain source data for constructing the three-dimensional abrasion map; (3) carrying out interpolation processing on the source data by use of MATLAB software to construct the three-dimensional abrasion map of the copper-based powder metallurgy wet friction material by use of the speed, the load and the abrasion loss as coordinate parameters. According to the method, the change rule of the abrasion loss of the copper-based powder metallurgy wet friction material along with the speed and the load can be acquired based on the constructed abrasion map, the abrasion loss and the service life of the copper-based powder metallurgy wet friction material can be predicted under different working conditions and the method has important engineering application value and the theoretical guiding significance.

The present invention relates to a lightning arrester device with an aging determination unit (1), comprising a lightning arrester (VAR) and an aging determination unit (1), the aging determination unit (1) has a first temperature measurement unit (S1) that detects the thermal state of the arrester (VAR), the aging determination unit (1) also has a storage unit (MEM) and an evaluation unit (CPU),the storage unit (MEM) stores aging data corresponding to the relationship between energy input and temperature characteristics of the arrester type, the first temperature measuring unit (S1) measuresthe temperature characteristics of the arrester (VAR) corresponding to the energy input, and the evaluation unit (CPU) obtains relevant aging data according to the measured temperature characteristics corresponding to the energy input, and then determines the aging degree of the lightning arrester (VAR).

The invention discloses a numerical simulation method for crack propagation on a pitting corrosion pit of an RPV pipe based on an extended finite element. The method comprises the following steps: determining the morphology and size parameters of the pitting corrosion pit generated by an RPV pipe material under an actual working condition through a test; establishing a pitting-pit-containing damage model suitable for the RPV pipeline material; defining load and boundary conditions; setting an XFEM unit enrichment area by calculating stress distribution; and simulating a crack cracking process on the pitting corrosion pit model. According to the method, the influence of the morphology and size of the pitting corrosion pit on the crack initiation position is considered, no prefabricated crack is added in simulation, damage accumulation-cracking whole-process simulation of cracks around the pitting corrosion pit from nothing to nothing under the approximate RPV pipeline working condition is achieved, and the service life of the RPV pipe can be effectively and accurately predicted.