439results about How to "Life expectancy" patented technology

The invention provides a forecasting method for creep-fatigue life of a material. The method comprises the following steps: respectively performing a creep test, a fatigue test and a creep-fatigue interaction test for the material at a same test temperature; establishing a relation between the failure strain energy density wf and a non-elastic strain energy density dissipation rate of the material under a log-log coordinate according to the creep test; acquiring the fatigue damage df of the material per period according to the fatigue test; acquiring a hysteresis loop under a half-life period according to the creep-fatigue interaction test and establishing a function relation of the change of the stress Sigma (t) of the material under the half-life period within the maximum tensile strain maintaining time along with the change of time t; calculating the creep damage dc under the half-life period by combining with the hysteresis loop and based on the relation between wf and the function as shown in the specification and the relation of change of the fatigue damage df and the stress Sigma (t) along with the change of time t; and utilizing a linear accumulating damage rule to forecast the creep-fatigue life of the material under a creep-fatigue interaction. According to the method provided by the invention, the life of the material under the creep-fatigue interaction can be accurately forecasted.

The invention discloses a life evaluation method for a modular multilevel converter (MMC). The life evaluation method comprises the following steps: reading year-round temperature data of a running natural environment of the MMC and power data input into the MMC; performing analytic calculation on the average value and the effective value of the current of sub-modules IGBT and Diode of the MMC; calculating the average loss power Ploss,T and Ploss,D of the sub-modules IGBT and Diode of the MMC within the fundamental frequency period; calculating the average temperature rise Tja of a semiconductor device within the working frequency period by use of a Forster network model to obtain the average junction temperature value Tj of IGBT modules (IGBT modules, IGBTs, including IGBT and Diode); modifying fitting calculation of loss of the IGBTs according to the average junction temperature of the IGBTs; calculating the extreme values of the function temperature within the working frequency and counting the year-round fundamental frequency junction temperature cycle; counting fluctuation information of the year-round low-frequency junction temperature; and calculating the failure number Nf of the fundamental frequency and the low frequency of the semi-conductor device by use of a Bayerer life model, and obtaining the life of the MMC in combination with operation conditions. The life evaluation method can reliably forecast the life of the MMC, can effectively improve the forecasting calculation speed through obtaining an analytical expression of both current and the junction temperature, and has the characteristics of project operational capability and the like.

The invention provides a vehicle road load simulation method which comprises the following steps of: 1) complete vehicle modular modeling; 2) complete vehicle modular model validation; 3) complete vehicle model assembly; 4) complete vehicle model validation; 5) establishment of finite element models of enhanced durable roads; 6) model initialization; 7) obtaining of virtual road load result; and 8) comparative validation with physical road load. The invention has the advantages of shortening development time and reducing costs, which is of great significance to vehicle development during the conceptual design phase. During the conceptual design phase of new models, fatigue analysis can be carried out before the design and manufacture process by using a virtual prototype to predict road load so as to truly predict the life of the product, thus greatly reducing great expenses caused by producing prototype machines and testing the fatigue life.

The invention discloses a device and a method for testing the thermal cycling performance of a thermal barrel coating. The device is arranged in a case and comprises a sample base for assembling a sample, a temperature measuring meter which is arranged in the case, a sample cooling device and a control system, a heating gun bracket, a heating gun, an automatic ignition device and a heating gun moving device. According to the control of the control system, after the sample is assembled on the sample base, the automatic ignition device is started to automatically ignite, and the heating gun moving device moves the heating gun to a place in certain distance from the sample to heat the sample; when the temperature measuring meter measures that the temperature of the sample reaches holding time, heating is automatically stopped, and the sample cooling device is started to cool the sample; when the sample is cooled to a temperature required by the test, the sample cooling device is closed; and the automatic ignition device automatically ignite again to start the next working cycle until the thermal barrel coating is stripped off and then the test is ended. The device and the method realize the test of the thermal cycling performance of the thermal barrel coating.

The invention provides a lithium battery service life pre-estimation method and device. The lithium battery life pre-estimation method comprises steps of obtaining a relation between a cycling capacity attenuation rate and a usage condition of a lithium battery, obtaining a relation between a storage capacity attenuation rate and a storage condition of the lithium battery, calculating the cycling capacity attenuation rate and a storage capacity attenuation rate of the lithium battery and estimating the service life of the lithium battery according to the cycling capacity attenuation rate and the storage capacity attenuation rate of the lithium battery.

The invention discloses a heading machine disc cutter wear extent pre-estimate calculating method. According to the method, a known heading machine structure parameter and a known technique parameter in a construction process are referred, and a corresponding relation between disc cutter rotation frequency and wear extent is directly established. The calculating method comprises the following steps: (1) measuring the disc cutter acceleration change in a rock breaking process, and obtaining disc cutter rotation frequency; (2) establishing a corresponding relation between the disc cutter rotation frequency and friction work; (3) establishing a corresponding relation between the disc cutter rotation frequency and the wear extent. The disc cutter wear extent at different times and different positions are obtained finally. According to the invention, an accurate disc cutter wear extent pre-estimate calculating formula is established, operation and data processing are simple, and a problem that determining the disc cutter wearing degree and predicting disc cutter life are needed in construction is solved. The invention provides a theory for optimization design of a cutterhead and cutterarrangement scheme and prolongation of disc cutter service life.

The invention relates to the diagnosis of faults and damage in a gearbox in order to predict the operational life of a gearbox. An end of line test is performed to infer information on each gearbox on the production line. A highly detailed model of the gearbox is created to determine the optimal sensor positions for the end-of-line test so that the test can discriminate between different types of manufacturing variation. This information is then used to construct a unique, highly detailed model for each gearbox. During operation, forces and moments acting on the gearbox are measured at regular intervals and the model is used to continuously update a prediction of the total damage on each gearbox component. The probability of failure in a given time period is then calculated. An existing condition monitoring system approach such as vibration analysis may be used in parallel with the model-based diagnosis. The overall probability of failure for a required lifetime is calculated and, if necessary, operation is limited to provide a required probability of failure in a given time period.

The present invention provides a method and device for predicting a battery life, relating to the technical field of battery detection. The method is executed by a server which is in communication connection with a charging terminal. The method comprises a step of obtaining a current charging record of a battery through the charging terminal, wherein the charging record comprises starting power and ending power of the charging terminal and a starting value and an ending value of the remaining power of the battery, a step of determining a current capacity efficiency of the battery according to the current charging record, a step of determining a charging number of times corresponding to the current capacity efficiency through a pre-established battery capacity attenuation table, wherein the battery capacity attenuation table records a corresponding relation between capacity efficiency and a charging number of times, and a step of generating a life prediction result of the battery according to the charging number of times. The above battery life prediction mode is simple and convenient and has low cost, and a user can conveniently and clearly understand the service life of the battery after charging the battery.

The invention relates to a method for adjusting the contrast of a projector in real time and a projector. The method comprises the following steps: the current brightness of ambient light is detected by an ambient light brightness detector; the current brightness of ambient light is multiplied by a reference contrast to obtain the brightness required by a projector; driving signals of different waveforms stored in a lamp lighter are called to control light emission of a light source of the projector; the brightness of a picture projected by the projector is detected by a projector brightness detector in real time until the detected brightness reaches the brightness required by the projector; and adjustment is completed, and the driving signal of the currently-selected waveform is used as a driving signal of adjustment completion so as to stop calling of the driving signals. The invention further relates to a projector. The brightness of ambient light and the brightness of the picture projected by the projector are acquired at the same time for real-time contrast adjustment, a good display effect can be achieved, and the human eyes can feel more comfortable. No negative impact is caused to the service life of the light source of the projector when the brightness is increased.

The invention discloses a method for predicting a corrosion lifetime of a casing pipe, which belongs to the field of corrosion protection of oil and gas well. The method is characterized by comprising the following steps: firstly performing corrosion test for casing pipe steel under a simulation working condition by utilizing a high-temperature high-pressure kettle, obtaining a uniform corrosion rate value, then obtaining an actual wall thickness of the casing pipe, and respectively solving remaining internal pressure strength and remaining collapse resisting strength of the casing pipe by utilizing the actual wall thickness of the casing pipe; and then calculating a remaining internal pressure resisting safety coefficient and a remaining collapse resisting strength safety coefficient of the casing pipe, respectively calculating an internal pressure resisting safety service lifetime and a collapse resisting safety service lifetime of the casing pipe according to a given internal pressure resisting safety coefficient threshold value and a collapse resisting safety threshold value, and finally obtaining a safety service lifetime of the casing pipe. The method has the advantages that the lifetime of the casing pipe can be reasonably predicted, and the safety risk caused by the corrosion of the oil and gas well casing pipe can be reduced or avoided.

The invention relates to an automobile engine control method based on digital twin technology. The automobile engine is regarded as a physical engine in the actual working environment, based on the digital twin technology, a digital twin virtual engine model which is matched with the physical engine is built on the simulation platform, and the simulation working environment of the virtual engine model is configured; the physical data generated by the operation of the physical engine and the virtual data generated by the operation of the virtual engine model are received by digital thread and alarge plurality of heterogeneous physical data and virtual data are subjected to data analysis fusion processing; and according to the processing results, the virtual engine model is updated, and thecorresponding optimal control strategy under the latest model is obtained based on the physical engine calibration performance and the current state of the vehicle combined with online simulation technology, according to the optimal control strategy, the physical engine is controlled by the engine management system, and the virtual engine model and the optimal control strategy are updated with real-time feedback, so that the dynamic rolling data exchange is formed to realize dynamic optimal control

A car air-conditioning system comprises a heating component temperature control circuit and a heat pump system with a refrigerant circulation loop. The heating component temperature control circuit and the heat pump system with the refrigerant circulation loop exchange heat through a double passageway heat exchanger. The car air-conditioning system comprises a refrigerating mode, a heating mode and a demist mode. The heat pump system with the refrigerant circulation loop comprises a compressor, a gas-liquid separator, a heater and a cooler, a compartment outer heat exchanger and a throttling component. The heater and the cooler conduct heating, cooling or demisting on the compartment according to working condition requirements in the compartment. The refrigerant passes through the heater after coming out from the compressor, the heater can choose whether to conduct heat exchange, and then the refrigerant flows into the compartment outer heat exchanger. The heater of the heat pump system just passes hot refrigerant, and the cooler just passes the cold refrigerant so as to avoid heat and cold shock and improve service life.

The invention provides a method for adjusting an electronic expansion valve. The method comprises the following steps: (a) acquiring superheat degree adjusting threshold F of a refrigerating system; (b) measuring the value of superheat degree SVn, wherein n is a natural number; and (c) determining the running mode of the electronic expansion valve according to the value of the superheat degree SVnmeasured in step (b); keeping the electronic expansion valve in current opening degree in case of SVn is not less than F-f and is less than F+f; decreasing the opening degree of the electronic expansion valve if the SVn is less than F-f; increasing the opening degree of the electronic expansion valve if the SVn is not less than F+f, wherein f is deviation value. According to the method, the system data can be detected through the control method when the system runs, and the opening degree is changed in real time so as to improve the system stability. Therefore, the system can be kept within asafe and reasonable working condition range all the time under the variation of the load and outer conditions, and meanwhile, the operation economy of the system under various working condition changing conditions can be improved; and the defect that the control method of an electronic expansion in the prior art is incomplete in case of the change of outside environment and the system cannot be kept in the optimal state all the time can be overcome.

The invention discloses a rechargeable battery, a method, and equipment, and aims to solve the problem that in the prior art the batteries cannot be charged rapidly. The rechargeable battery comprises an electrical core, which comprises an external packing layer and electrolyte; and a roll core, which comprising a positive electrode, a diaphragm, a negative electrode, a metal positive electrode lug, and a metal negative electrode lug; wherein the positive electrode is prepared by painting a positive electrode active material on a first current collector, the negative electrode is prepared by painting a negative electrode active material on a second current collector, and the roll core is prepared by laminating the positive electrode, the diaphragm, and the negative electrode and then rolling. The average particle size of the negative electrode active material is smaller than a first predetermined particle size, and the specific surface area of the negative electrode active material is larger than a first predetermined specific surface area, so that the digit, which is provided for ions to carry out electrochemical reactions, of the negative electrode active material is greater than a first predetermined digit, and the ion reaction speed is faster than a first predetermined speed, wherein the ions come from the positive electrode active material.

The invention relates to a machine side oven door of stamped coke ovens and an arrestment process and a device of smoke and dust from oven top, the process and device interflow two plumes of smoke in a flap valve which is provided with double nip via a smoke control assembly of the machine side oven door and a smoke dust control assembly of the oven top, and lead the smoke and dust which are interflowed by the process and device into an earth dust elimination station via the flap valve which is provided with double nip. By comparison with the prior art, the invention has the advantages that the process achieves the smoke dust arrestment of the machine side oven door of a stamped coke oven and the oven top via the smoke control assembly of the oven door arranged at the top portion of the machine side and a moveable smoke control assembly of the oven top of a smoke guiding car, and lead the smoke and dust into the earth dust elimination station, thereby controlling the spreading of the pollution to the utmost extent.

The invention relates to a capacitor fling-cut switch with simple structure, low cost and high reliability and no inrush current when switching capacitors. The capacitor fling-cut switch comprises three magnetic latching relays (J1, J2, and J3) and corresponding control circuits which can control a three-phase power capacitor C. The input terminal of a connection point of J1 is connected with an A phase power supply and the output terminal of the connection point of J1 is connected with a first terminal of the capacitor C; the input terminal of a connection point of J2 is connected with a B phase power supply and the output terminal of the connection point of J2 is connected with a second terminal of the capacitor C; the input terminal of a connection point of J3 is connected with a C phase power supply and the output terminal of the connection point of J3 is connected with a third terminal of the capacitor C. The make-and-break operations of connection points of the magnetic latching relays are controlled by the control circuits; the make-and-break operations of connection points of all magnetic latching relays are always related closely with the phases of power supplies, therefore the capacitor fling-cut switch belongs to synchronous switches and the no inrush current input and current zero-crossing cut-off of the capacitor can be realized by using the functions of the synchronous switch.

The invention discloses power savings in a mobile communications device through dynamic control of processed bandwidth. User equipment (UE) in a cellular communication system is capable of both high data rate uses such as streaming video and low data rate uses such as voice. UE in accordance with the disclosure camps on to a cell with a narrow bandwidth downlink when its data rate requirements are low, rather than a cell with a wide bandwidth download. Since the computational burden of processing the narrow bandwidth downlink signals is less than that for processing the wide bandwidth downlink signals, a power reduction in the UE is realized from the reduced computational load. A normal handover between cells with wide and narrow bandwidth downlinks can be used. Alternatively, a single cell can dynamically change its downlink bandwidth resulting in a reduced computational load and reduced power consumption in the UE.

Provided is a prediction method for life of a secondary battery based on particle filter and a mechanism model. The invention is aimed at solving the problem in the prior art that the prediction for life of a secondary battery is totally based on data drive and does not take the defect of an object mechanism so that a prediction result for the life of an electrochemical power source has poor accuracy.In a training stage, a particle filter method is utilized for tracking the actual value of internal state variables for the battery such that a regression equation of state variables varying with charge-discharge cycle frequency changes is obtained as a new state equation. In a prediction stage, the new state equation is utilized for calculating estimation values of state variables during unknown charge-discharge circulation in order to generate multiple particles. Multiple estimation values for capacity observation values are taken into an observation equation such that medians of estimation values for multiple capacity observation value are utilized for predicting the battery capacity in the future during the charge-discharge circulation. When the pre-set battery capacity reaches the lower limit, difference value between cycle numbers corresponding to the capacity observation value and cycle numbers used in the training stage is used as the residual number of cycles available for the battery.

The invention relates to a flash memory life test method based on an error mode. The method comprises the following steps: extracting a sample flash memory and connecting a sample flash memory chip with a flash memory test system; writing a test pattern accelerating wearing or a test pattern exciting an error into the flash memory; reading the data in the sample flash memory, recording the original error bit rate and comparing the original error bit rate with the ECC error correction capability of the sample flash memory; and repeating the read and write operation on the sample flash memory chip when the original error bit rate is less than the ECC error correction capability, or the sample flash memory is proved to be damaged and the lifetime of the sample flash memory is the number of erase operation. The characteristics of oxide degradation and present flash memory chip process manufacturing are combined, the specific high-efficiency flash memory test pattern based on the error modeis adopt to accelerate wearing of the flash memory chip and excite the inherent defects of the internal unit of the flash memory chip so as to realize fast flash memory detection.

The present invention provides a medical appliance intelligent monitoring system. The medical appliance intelligent monitoring system comprises monitoring devices and a management system, wherein the monitoring devices are connected with the management system, and the management system is connected with a central server of a hospital; each monitoring device is corresponding to one medical device, and is used for collecting medical images of the medical device, transmitting the collected medical images to the management system, receiving instructions from the management system to intelligently monitor the use of the medical device, and feeding the use condition back to the management system in real time; and the management system comprises a server and software that comprises device monitoring software and diagnosis result management software. The medical appliance intelligent monitoring system effectively combines an electronic technology, a computer technology and an application technology of precision sensing and medical appliances, so that the problem of difficult charge management of medical instruments is fundamentally solved; and the medical appliance intelligent monitoring system can reasonably integrates image resources, and by virtue of analysis of an advanced medical image processing technology, diagnostic pathology is effectively and professionally processed, the workload of doctors is lightened, and the diagnostic efficiency is improved.

The invention provides storage equipment and a standby battery charging method and control device therefor. The method comprises the steps: judging whether the cell temperature sampling value of a standby battery is greater than a preset threshold value or not when the standby battery is in a charging state; controlling a cooling fan of the standby battery to increase the rotating speed when the cell temperature sampling value of the standby battery is greater than the preset threshold value, so as to reduce the environment temperature of the standby battery, thereby enabling the standby battery to dissipate heat in a better way, and reducing the cell temperature. Meanwhile, through judging whether the time when the cell temperature sampling value is greater than the preset threshold value is greater than a preset time duration or not, the method obtains a control effect of reducing the cell temperature through reducing the environment temperature. If the time when the cell temperature sampling value is greater than the preset threshold value is greater than the preset time duration, it indicates that the heat dissipation capability of the external environment cannot effectively achieve the control of the cell temperature, and the charging current of the standby battery is controlled to be reduced at this moment, so as to reduce the cell temperature, and prevent the overheating of a cell from affecting the service life of the standby battery.

The invention relates to a method for vacuum degree measurement and life management of a vacuum arc extinguish chamber, which is based on an expert system in electric grid. The invention comprises anexpert system main module, a residual life predicating module and a life management module, a vacuum degree measurement device by a magnetic control method, and a vacuum degree measurement device by ashielding case potential method, wherein the expert system main module is respectively connected with the residual life predicating module and the life management module, and the vacuum degree measurement device by the magnetic control method and the vacuum degree measurement device by the shielding case potential method. The data measured on line by the vacuum degree measurement device by the magnetic control method and the vacuum degree measurement device by the shielding case potential method is provided to the expert system which provides results and outputs life management information based on a reliability knowledge base of the measured data. In the invention, the vacuum degree in the vacuum arc extinguish chamber can be measured in the power grid, and also the residual life can bepredicated and off-line monitoring can be realized so as to avoid the reduction of reliability coefficient of a powder system due to the access of on-line measurement equipment, thereby meeting the requirement of switch electrical applicance state examination, and realizing the intelligentizing of a vacuum switch.

The invention relates to a device and a method in the testing technical field, in particular to a synchronization testing device and a testing method of thermal barrier performance and thermal shock performance of a thermal barrier coating. The method enables the thermal barrier performance and the thermal shock performance of the thermal barrier coating to be obtained simultaneously and temperature change of a test sample in a thermal shock performance testing process to be recorded in detail, and facilitates deep analysis of the thermal shock failure mechanism of the test sample. According to the testing method, heating and cooling methods of the test sample can be determined as needed, and therefore serving conditions of a thermal barrier coating component can be simulated close to reality, quality of the thermal barrier coating can be tested accurately, the service life of the thermal barrier coating can be estimated accurately, and further the spraying effect of the serving component under a high-temperature working condition can be effectively estimated.