8 results about "Time delayed" patented technology

An auto-occlusion safety device is provided for use in preventing rupture of infusion components during rapid infusion procedures. An occlusion valve is disclosed having a threshold pressure that is less than a rupture tolerance of the infusion system components. As the fluid pressure of the infusion system increases beyond the threshold pressure of the occlusion valve, the occlusion valve is automatically activated thereby occluding fluid flow upstream from a vulnerable infusion component. An accumulator is further disclosed for use in combination with the safety device to compensate for time delays in full activation of the occlusion valve.

The invention discloses a tracking control method and system for a cascade type continuous stirring reaction kettle time delay system under a state dependence constraint, and belongs to the technical field of automatic control. The method comprises the following steps: acquiring a nonlinear time-lag system model, constrained by state dependence, of a cascade type continuous stirred tank time-lag system based on a mechanism model of the cascade type continuous stirred tank time-lag system; obtaining a time-varying asymmetric Lyapunov function of the cascaded continuous stirred tank reactor based on the nonlinear time-delay system model; and based on the time-varying asymmetric Lyapunov function and the Lyapunov-Krasovski function, obtaining a controller of the continuous stirred tank reactor, and performing tracking control on the cascaded continuous stirred tank reactor through the controller. According to the method, a nonlinear time delay system model subjected to state dependence constraint is taken as a basis, and the influence of time-varying time delay and state dependence constraint on the system performance is eliminated by combining a time-varying asymmetric Lyapunov function and a Lyapunov-Crasovski function.

The present application relates to a kind of residual agricultural film water pollution prediction methods based on time delay embedding timing recursive network, comprising the following steps: S1: regional multi-source data acquisition and dataset construction, provide input data for prediction model;S2: build timing recursive prediction model, based on the timing recursive of multilayer gate control cycle unit GRU and time delay embedding mechanism builds prediction model, establishes the dynamic transmission relationship between residual agricultural film, soil characteristics and water pollution three kinds of medium;S3: pollution transmission chain construction and dynamic prediction, in prediction model, introduce intermediary variable and environmental driving factor, build from residual agricultural film to soil characteristics, again to water pollution, realize the dynamic prediction and response analysis of pollution process.The present application can show the time lag relationship between pollution release and water quality response, simulate the timing recursive process of residual agricultural film pollution between multiple media, provide reliable technical support for water pollution risk early warning and management decision.

The invention provides a device for testing the time delay effect of a time delay mechanism, the time delay mechanism comprises a core shaft, and a gap for fluid to pass through is formed in the core shaft along the axis direction. The testing device comprises a liquid inlet part and a liquid outlet part buckled with the liquid inlet part, and the liquid inlet part and the liquid outlet part are both constructed into structures with hollow interiors and two ends respectively communicated with the outside and are used for jointly forming a channel for fluid movement. And the mandrel is arranged in the channel in a circumferential sealing manner, so that the liquid inlet part and the liquid outlet part are communicated with each other through a gap in the mandrel. According to the arrangement mode, fluid can move into the liquid outlet part from the liquid inlet part along the gap in the mandrel. Therefore, the time delay effect of the time delay mechanism can be tested.

The application discloses a runoff prediction method considering double-layer time delay effects of reservoir regulation and water taking and using. The method comprises the following steps: constructing a normalized time sequence feature matrix corresponding to each runoff section according to a feature set of each runoff section in multiple historical time sections and a prediction time section; performing space-time fusion on the normalized time sequence feature matrix according to feature attention weights and time attention weights pre-trained for each runoff section, inputting a space-time fusion result matrix into a learner, obtaining an equivalent influence quantity prediction value in the prediction time section, and obtaining an actual runoff prediction value of each runoff section; and repeatedly performing the above operations until actual runoff prediction values of each runoff section in multiple prediction time sections are generated. The technical scheme of the embodiment of the application can effectively improve the river runoff prediction accuracy in the scene where water engineering and water taking and using process monitoring data are lacking.

The invention relates to the technical field of oil and gas metering, in particular to a method and a device for determining time lag of a time-space fusion depth prediction model of a high-water-content analyzer. The method comprises the following steps: training an established space-time fusion depth prediction model according to collected operation parameter data of the crude oil high water content analyzer within preset time; determining a Shapley value under each time delay order according to the constructed energy model and the prediction model; respectively determining the ratio of the Shapley value of each time delay order number; and finding a time delay order corresponding to a ratio value which is greater than or equal to a preset ratio and has a minimum difference value with the preset ratio in all the ratios as an optimal time delay order of the space-time fusion depth prediction model. The problems that an existing time lag determination method of a space-time fusion depth prediction model of a crude oil high water content analyzer depends on modes such as human experience or information criteria, the accuracy of time lag cannot be guaranteed, interpretability is lacked, and the precision of a prediction result is low are solved.

This invention discloses a highway platoon asymptotic stability control system, method, and electronic equipment with a time-delay model, belonging to the field of vehicle-to-everything (V2X) and cooperative control technology for highways. It includes a data acquisition and calibration module, a platoon asymptotic stability criterion module, and a hierarchical control decision module. This invention improves the driving safety and traffic efficiency of highway platoons by collecting vehicle motion data in real time, calculating the stability index of each vehicle in the platoon, and triggering early warnings or control suggestions when approaching instability.

The invention discloses an agent injection optimization control method and system for large time lag, and relates to the field of industrial process intelligent control, and the method comprises the steps: predicting a predicted operation data sequence set of a future preset time zone according to an operation monitoring data sequence set of boiler water treatment equipment in a historical time zone; analyzing a predicted phosphate radical concentration sequence in a preset time zone; performing analysis according to the predicted operation data sequence set to obtain pipeline transmission time lag and chemical reaction time lag in a preset time zone, and performing summation to obtain medicament onset time lag; in the boiler water treatment simulation space, optimizing a phosphate injection scheme based on the predicted phosphate radical concentration sequence, and determining an optimal dosing instruction sequence; and performing time precompensation on the optimal dosing instruction sequence according to the medicament onset time lag, and performing medicament injection control according to the adaptive dosing instruction sequence. The problems that the control effect is seriously lagged, the prediction model is often single, the control accuracy of the control strategy is low, and the evaluation dimension of the control scheme is single are solved.