16 results about "Critical time" patented technology

The application provides a model test method for simulating progressive weakening of slope strength, and relates to the technical field of geomechanical model test, which comprises the following steps: curing base material to obtain a sample, wherein the sample is a cylinder; selecting a weakening solution by trial method according to a preset model slope evolution time length; performing a weakening test on the model slope by immersing the model slope in the weakening solution; obtaining evolution process information of the model slope, and determining a critical time corresponding to the occurrence of a sliding surface of the model slope; performing a weakening test on the sample by using the weakening solution, and performing an unconfined compression test on the sample when the test time reaches the critical time, so as to obtain the cohesion of the sample; and calculating the critical cohesion of a prototype slope from the cohesion of the sample. In the case that the shear strength of the slope body is insufficient, the strength parameter of the slope body is gradually reduced, and the whole process of the slope body instability evolution is studied.

The invention relates to the technical field of reliability testing of Android equipment without a built-in battery, and discloses a file damage critical time determining method, testing equipment and a system.The method comprises the steps that after a testing file is received, power-off operation is executed by delaying a preset duration, and power-on is conducted again after power-off to detect a hash value of the file, so that whether the file is damaged or not is judged; if the current hash value is matched with the original hash value, further detecting the time precision of the preset duration, adjusting the preset duration when the time precision does not reach a set value, repeating the test, and taking the preset duration at the moment as the file damage critical time after the time precision reaches the standard; the technical means of delaying the preset time length for power-off, detecting the file state in combination with the Hash value matching and then adjusting the preset time length according to the time precision is adopted, so that the problem that the control precision of the power-off time of the traditional power-off test is insufficient is solved, and compared with the prior art, the effect of accurately reproducing the damage critical time of the file system is realized.

The invention discloses a power plant unit control method and system based on edge calculation, and relates to the technical field of edge calculation. The method comprises the following steps: acquiring and processing a first data set in real time by utilizing an edge computing node; when the key time period is identified, triggering a corresponding dynamic adjustment mechanism; the technical key points are as follows: on the basis of an originally divided key period and an originally divided non-key period, the period is divided twice to obtain a calibrated period and a non-calibrated period, different constraint condition correction factors are adopted to adjust an originally determined probability factor, so that a control strategy is more targeted, and by constructing a parameter adjustment model, the accuracy of the control strategy is improved. The time difference adjusted in advance is output, and the control is dynamically adjusted according to the time difference, so that a preset management mode is realized, the accuracy of regulation and control is realized, much inconvenience caused by instant response is avoided, the problem that a traditional single control strategy is difficult to meet diversified working requirements is solved, and the flexibility and adaptability of the control strategy are improved.

The present application relates to the technical field of fluid control valve, specifically to a pilot pressure reducing valve pilot pressure pipe length optimization design method. The present application uses the force balance equation containing time lag to obtain the critical time lag of the system generating periodic oscillation, then establishes the length constraint equation of the pilot pressure pipe through the relationship between the pipe length and the critical time lag, finally uses the iterative method to obtain the maximum allowable length of the pilot pressure pipe, and then outputs the actual length according to the field installation requirement, which can provide adjustment suggestions for different installation conditions and has wide adaptability. At the same time, the reasonable range of the pilot pressure pipe length can be determined at the design stage, the pilot pressure pipe can be avoided to be replaced repeatedly on site, the installation cost is reduced, and the consistency of the valve is improved.

The application provides a gate position correction method and a correction mechanism, and relates to the technical field of gate control of a hydropower station.The method comprises the following steps: constructing a trajectory prediction model and a global coordinate system; inputting a gate state vector into the trajectory prediction model to obtain a predicted trajectory; determining a predicted offset vector, a predicted offset rate and a correction critical time; selecting a correction start time; obtaining a predicted trajectory point and a predicted offset vector corresponding to the correction start time to obtain a correction start position and a correction start offset vector; determining a target position of a contact point based on the correction start offset vector and a current position of the contact point of the correction mechanism; moving the contact point of the correction mechanism to the correction start position at the correction start time; and moving the contact point of the correction mechanism to the target position of the contact point during the correction. The method can predict the offset trend of the gate in advance, rather than reacting after the actual offset occurs, thereby shortening the time interval from discovering the problem to taking action.

The application discloses an energy consumption control and regulation method and system for a smart farm, and relates to the technical field of intelligent regulation and control.The method comprises the following steps: acquiring historical temperature and humidity regulation values, historical light intensity regulation values and historical concentration regulation values; determining whether three types of data are all in the same regulation time point for environment regulation; counting three types of historical regulation schemes; training a simulation prediction model one; if the external environment characteristics of each historical period in the historical regulation record data present an unstable state, then counting a first variable regulation scheme and a second variable regulation scheme performed in a time period before a historical variable critical time point and a time period before and after the historical variable critical time point, training a simulation prediction model two, and testing the current prediction regulation scheme by the simulation prediction model one or the simulation prediction model two according to the current external environment characteristic value.The energy consumption control and regulation method and system for the smart farm can improve the energy consumption control efficiency.

The present application relates to the technical field of metal material corrosion and protection, and particularly relates to a non-passivated metal material erosion corrosion evaluation method based on time-performance coupling, comprising setting test conditions and data collection schemes; synchronously collecting time-performance data; quantitatively determining three critical time nodes for dividing the whole erosion corrosion cycle into stages of different failure risk levels as the quantitative demarcation points of time-performance coupling; dividing the whole erosion corrosion cycle into risk stages; and performing comprehensive evaluation. The present application has the following advantages: based on the nonlinear evolution characteristics of the erosion corrosion damage mechanism, a dynamic evaluation system of time-performance coupling is established, the whole erosion corrosion cycle is divided into stages of different risk levels by quantitatively determining three critical time nodes, the precise mapping of the time dimension and the material performance attenuation process is realized, and the key problem that the traditional method cannot reflect the whole process behavior of the material from the initial damage to the final failure is solved.

This application relates to the field of wind power generation technology, and provides a method, device, and wind turbine for emergency protection of wind turbine blade clearance. The method includes: determining the clearance deterioration rate based on clearance monitoring data; and triggering an emergency feathering action at the maximum pitch rate in response to the clearance deterioration rate meeting an emergency triggering condition. This application uses the clearance deterioration rate as a leading trend warning criterion, identifying and proactively intervening in deterioration trends before the absolute clearance falls below the safety threshold. It also overcomes the rate limitations of conventional shutdown logic, rapidly avoiding danger at the maximum pitch rate, significantly shortening the protection response time, and securing a critical time window for establishing a safe clearance margin, effectively reducing the probability of tower sweep accidents.

The invention relates to reliable control techniques for non-volatile memories. Specifically, the invention relates to a non-volatile memory controller, a control method and a computer program product. The non-volatile memory is provided with a plurality of blocks. A processor of a non-volatile memory controller includes a time tag for recording at least one page in each block for programming. The processor executes a reliability check on a target block corresponding to a target block whose time label exceeds a critical time limit, and moves data of the target block to the standby area when the reliability of the target block is lower than a critical standard.

The application relates to the field of rail transit vehicles and discloses a vehicle holding brake releasing method and device, a storage medium and an electronic device. The method comprises the following steps: determining a starting acceleration according to a traction force at a starting moment, a holding brake force at the starting moment and a starting resistance; determining a critical time for issuing a holding brake releasing instruction according to the starting acceleration and a preset starting condition; determining a target releasing gear stage according to the critical time through a preset gear stage determination model; determining an instruction sending time of the holding brake releasing instruction according to the target releasing gear stage and a preset impact rate limitation threshold; and controlling the starting of a target vehicle according to the target releasing gear stage and the instruction sending time. The time from the sending of the holding brake releasing instruction by the signal system to the starting of the train is greatly shortened, the starting speed of the train is improved, the traction force at the starting moment of the train can be reduced, and the starting impact of the train is reduced.

The invention discloses an energy consumption control and regulation method and system for an intelligent farm, and relates to the technical field of intelligent regulation and control, and the method comprises the steps: carrying out the environment regulation and control according to whether three types of data of a historical temperature and humidity regulation and control value, a historical light intensity regulation and control value and a historical concentration regulation and control value are all at the same regulation and control time point or not; the method comprises the following steps: calculating three historical regulation and control schemes, and training a simulation prediction model I; and if the current external environment characteristic value is a historical change critical time point, counting a first change regulation scheme and a second change regulation scheme which are respectively carried out before the historical change critical time point and before and after the historical change critical time point, training a second simulation prediction model, and carrying out testing through the first simulation prediction model or the second simulation prediction model according to the current external environment characteristic value to obtain a current prediction regulation scheme. According to the energy consumption control and adjustment method and system for the smart farm, the energy consumption control efficiency can be improved.

The application discloses a kind of active front wheel steering time delay feedback controller parameter time delay feasible region's calibration method, and include steps: 1) the vehicle system model of active front wheel steering feedback controller including time delay is established;2) by constructing Lyapunov-Krasovskii functional, time delay independent stability parameter region is solved;3) by Laplace transform solving system characteristic equation, obtain stability discriminant polynomial;4) it is solved to the minimum critical time delay that can be tolerated under time delay independent stability region and time delay related stability zone under different control parameter combinations of system.This application can provide reference for controller stability design, compared with traditional active front wheel steering controller without considering time delay, can more effectively judge whether system meets stability requirement, and reduce control parameter adjustment range, so as to reduce test cost in actual engineering, guarantee the stability of vehicle control system.

A reliability control technology for non-volatile memory is shown. A non-volatile memory has a plurality of blocks. For each block, the processor records a time stamp about programming of at least one page in the block. The processor performs a reliability check on the target block that corresponds to a time stamp exceeding a critical time limit and, if the reliability check shows that the target block does not meet a reliability standard, the processor moves data from the target block to a spare space for safe migration.

The invention discloses a power distribution network partition cooperative control method and system based on boundary node attribution, and belongs to the technical field of power distribution network control. According to the method, the damaged critical time period is synchronized through the power of the adjacent power supply areas of the active power time sequence curve; according to a power synchronization damaged critical period and a historical voltage deviation sequence, effectively identifying boundary nodes which generate power oscillation after power synchronization is damaged; the power supply area attribution of each power oscillation boundary node of the adjacent power supply areas is evaluated through historical area reconstruction times and a historical voltage deviation sequence, so that dynamic division of the power supply area attribution of the power oscillation boundary nodes can be realized; and finally, configuring the electrical data of each power supply area through the power supply area affiliation of the power oscillation boundary node, thereby realizing the partition cooperative control of the power distribution network, and improving the adaptability and accuracy of the partition cooperative control of the power distribution network.

This invention relates to the field of equipment control technology and discloses a method and system for graded overpressure interlocking control of thermal equipment. The method includes: calculating the pressure change rate, time margin, and material disturbance index; triggering a first-level interlock if the cavity pressure does not reach the first-level pressure relief threshold but meets the pre-trigger condition or if the cavity pressure reaches the first-level pressure relief threshold; if the cavity pressure continues to rise, entering a pressure relief stage constrained by material disturbance; executing a second-level interlocking pre-protection if the cavity pressure reaches a preset advance protection pressure or the time margin is less than or equal to a preset critical time margin threshold; triggering a hard shutdown if the cavity pressure is greater than or equal to a preset second-level shutdown threshold; exiting the interlocking control state if the cavity pressure drops below a preset recovery threshold and the pressure change rate is not greater than zero for a duration that reaches a preset recovery judgment duration. This invention balances the pressure relief rate and material stability through graded overpressure interlocking control, reducing the probability of shutdown.

The invention discloses an equipment intelligent operation and maintenance decision-oriented fault diagnosis subsystem design method and device, and relates to the technical field of fault diagnosis, and the method comprises the steps: obtaining the related data of target equipment, and obtaining a plurality of to-be-diagnosed fault modes of the target equipment based on the related data; constructing a plurality of candidate diagnosis algorithm combination schemes based on each to-be-diagnosed fault mode; optimizing the plurality of candidate diagnosis algorithm combination schemes based on an optimization algorithm to obtain a plurality of diagnosis algorithm combination schemes meeting a critical time index; and evaluating the diagnosis precision of the plurality of diagnosis algorithm combination schemes according to the evaluation model, and obtaining an optimal diagnosis algorithm combination scheme based on the diagnosis precision. Through the optimized diagnosis algorithm combination scheme, it is ensured that each related diagnosis algorithm can make a diagnosis conclusion within a critical time index, the capacity of capturing and analyzing early fault signals is improved, the faults are effectively prevented from being diffused in a propagation chain in equipment, and therefore early diagnosis of the faults is achieved.