41 results about "Control saturation" patented technology

The invention discloses an undisturbed soil sample expansion force testing device capable of controlling the saturation. The device comprises a base supporting system, wherein a lower disc is fixed on the base supporting system, a cutting ring base and a cutting ring are arranged on the lower disc, and the upper part of the cutting ring base is provided with an upper cover; a central circular groove and an annular groove are formed on the lower disc, a soil pressure sensor is arranged in the central circular groove, an annular water penetration plate is arranged in the annular groove, water-immersion circular grooves are formed on the annular water penetration plate, water-permeable stones are uniformly placed in the water-immersion circular grooves, and the bottom of the annular groove is connected with an external water injection system through a pipeline; a soil sample is placed between the lower disc and the cutting ring, and a water-permeable plate base which is provided with a water-permeable plate and water-permeable holes is arranged on the top of the soil sample; and a plunger, overflow equipment and vacuum extraction equipment are arranged on the upper cover. The device effectively solves the problems that testing devices for an expansion back pressure method, a pressurization expansion method and a balance pressurization method have relatively large disturbance on soil sample structures, cannot effectively control strict saturation states and are relatively long in testing time consumption.

The invention discloses a tone mapping method for a high dynamic range image. The method comprises the following steps of: firstly, reading the high dynamic range image, and acquiring a log-domain brightness image of the high dynamic range image; secondly, estimating illumination components of the high dynamic range image by multi-scale weighted least squares (WLS) filtering to avoid the phenomenon of halo generated at a high light and shade contrast place; thirdly, recovering brightness components of the high dynamic range image by using a multi-scale Retinex method, eliminating the gray of a 1% part of each of two poles to prevent under-exposure and over-exposure, and adjusting the brightness degree of the image according to a self-adaptive adjustment function; and finally, recovering the color of the high dynamic range image by introducing an index control saturation method. The tone mapping method for the high dynamic range image is applicable to display and output of the high dynamic range image on low dynamic range equipment, generation of the halo can be avoided, and the displayed image has the characteristics of high contrast and good detail reproduction effect.

The invention belongs to the technical field of processing of high molecular material, and in particular relates to a method for preparing a crystalline polyether-ether-ketone foam material. By the method, the content of crystal in polyether-ether-ketone and the thickness and the perfection of a laminated crystal are controlled by controlling saturation temperature, saturation pressure and saturation time by using near-critical or supercritical carbon dioxide as a physical foaming agent so as to prepare the polyether-ether-ketone foam material with high performance. By the method, the defects that the gas saturation time is long, the solubility is small, the growth of a foam hole and morphology crystallized area are limited and the like are overcome, so that by controlling technological parameters, the high-performance foam material with the low-intensity and the high foaming ratio is effectively prepared, the application field of polyether-ether-ketone is widened, and the blank of a domestic high-performance crystalline polyether-ether-ketone foaming technology is made up.

The invention discloses an anti-saturation adaptive control method and a system of a nonlinear active suspension. The method and system fully consider the non-linearity of stiffness and damping in suspension control process, establish the non-linearity suspension model before and after suspension control, solve the problem that the existing suspension design model is relatively simple, and make the model more accurate; And aiming at the actuator saturation problem existing in the actual vehicle, The method of input error saturation amplification is adopted, and a stable auxiliary system is introduced to realize the compensation of control saturation, which not only ensures the consistency and boundedness of output error, but also has good smoothness and easy to select parameter value, so that the suspension system successfully achieves the goal of anti-saturation. Further, the method and the adaptive backstepping control method proposed by the system of the invention effectively solvethe influence of parameter uncertainty on the suspension system, and improve the ride comfort, ride comfort and operation safety.

The invention firstly proposes two types of sensors: ESO and NNO, depends on the performance of an observer, proposes two new adaptive instruction filtering Backstepping no-model control methods, and enables the methods to be used in a ship power system so as to inhibit chaotic motion. The two types of proposed no-model adaptive instruction filtering Backstepping control are used for solving three problems: 1) there is no need to know a speed signal because the proposed control method can achieve the closed loop stabilization with no speed sensor; 2), the control method does not need a system dynamic mathematic model; 3), the two types of proposed control can eliminate impact from virtual control and control saturation. In addition, the method achieves stability analysis for a closed loop control system. A simulation result indicates that the method can guarantee the stability of the closed loop system of a second-order nonlinear system, and can estimate a speed state and recognize an unknown dynamic model.

A crystallized cefathiamidine is prepared from the cefathiamidine solution through controlling pH to 3.5-6.5, adding proper solvent until the solution becomes cloudy, controlling saturation procedureand crystal growth speed while adding said solvent, separating and drying. Its advantage is uniform granularity. It can be used to prepare the medicines for treating the infection of staphylococcus aureus, pneumoccus, enterococcus, streptococcus, etc.

The invention discloses a device for adjusting and controlling dissolved gas saturation in water under different pressure intensities. The device comprises a closed water storage tank, a liquid circulation module, a test observation module, a pressure module, a dissolved gas concentration measurement module, a gas circulation module and a water tank height adjusting module, the liquid circulationmodule provides circulation liquid for the closed water storage tank, the test observation module comprises a test table for placing samples, the test observation module is connected with the water storage tank and the liquid circulation module, the pressure module is used for measuring and adjusting gas pressure intensity and arranged at the top of the closed water storage tank, the dissolved gasconcentration measurement module is used for measuring the oxygen content in liquid in the closed water storage tank, and the gas circulation module is connected with the top and the bottom of the closed water storage tank through pipelines, so that air of the top of the closed water storage tank is pumped into liquid of the bottom of the water storage tank. According to the device, the dissolvedgas saturation in the water is adjusted and controlled, gas pressure intensity of the upper portion of the water surface is adjusted by the pressure module, relative liquid level and relative heightof the samples are adjusted by the water tank height adjusting module, and the device controls saturation states to keep stable or change.

The invention discloses a multifunctional stimulating device for soil vibrating and liquefying as well as pile foundation liquefying resisting functions. The stimulating device comprises a sand box stimulating device part, a telescopic pile foundation stimulating and controlling device part, different vibrating load loading device parts and a movable type pore water increasing-reducing device part. The movable type pore water increasing device controls saturation degree of water-containing sandy soil in the sand box through a water adding or reducing way, different vibrating load loading devices can apply different types of vibrating load, and vibrating and liquefying phenomena under different saturation degrees and different vibrating load of the water-containing sandy soil can be observed. The length of a variable pile foundation buried in the water-containing sandy soil is controlled, so that a tilting condition of a short pile foundation while the saturated soil is liquefied, and action, in resisting soil liquefying, of the long pile foundation can be observed. The device has the advantages of being multifunctional, easy to operate, repeatable, and visual in display, and is suitable for displaying the soil vibrating and liquefying as well as pile foundation liquefying resisting functions in the civil engineering field.

The invention discloses an electro-hydraulic servo control method based on fading memory filtering and a 2-DOF mechanical arm. Dynamic control performance of the electro-hydraulic servo control driven 2-DOF mechanical arm with uncertain parameters is improved under the condition of external load disturbance by a parameter self-adaption reverse step control method. Uncertain parameters of a model in an electro-hydraulic servo system are estimated by a parameter self-adaption estimation rule, and then a reverse step control rule is designed to realize position tracking of the mechanical arm. In order to avoid the differentiation explosion effect generated by virtual control amount in the reverse step control rule, the virtual control amount and the external load disturbance are filtered through the control rule provided by the invention and by a method based on a fading memory filter, risks of control saturation are reduced to a certain degree, and dynamic control performance of joint movement of the 2-DOF mechanical arm is improved.

The present invention relates to a method and a fluid for drilling or intervening in a well passing through a porous, permeable formation, wherein a water-based well fluid is circulating in said well. In this method, there is added to the fluid not only the conventional ingredients for such a fluid but also a maximum of 10 wt. % of a composition obtained from a grease or oil and an alcohol, with the chain lengths of the acid and alcohol parts being chosen such that the ester thus obtained has sufficient dispersion in water, compatibility with said ingredients, does not form an emulsion with the reservoir oil, and adsorbs sufficiently on the porous formation.

A volume level and crossfade controller with programmable fades and audio stream priority controls saturation for a multiple audio stream mixer. Start of fade and end of fade events trigger updates of relative volume level targets and volume ramps.

According to example embodiments, a color image panel includes pixels configured to display a color image. At least one of the pixels includes a tunable photonic crystal filter configured to reflect light in a wavelength band of a selected color and to transmit light in a wavelength band other than the wavelength band of the selected color, based on a stimulus controlling a photonic bandgap of tunable photonic crystal filter, and a white display unit configured to control saturation and brightness of color displayed by the tunable photonic crystal filter, based on the white display unit adding white light to color light reflected from the tunable photonic crystal filter.

A system for power amplifier control saturation detection and correction includes a comparator configured to receive a power control signal and a detected power signal and generate a regulated voltage, a power amplifier configured to receive the regulated voltage and develop an output power, a power detector configured to sense the output power and develop the detected power signal, a saturation detector configured to receive the regulated voltage and a system voltage and determine whether the power amplifier is operating in a saturation mode during a transmit burst, and a current generator configured to reduce the power control signal when the power control signal exceeds a predetermined value and after expiration of a predetermined period of time, preventing the power control signal from exceeding the detected power signal.

A method of determining one or more interaction parameters for the interaction between an analyte and a ligand using a biosensor, which comprises the steps of: A: providing a sensor surface having the ligand immobilized thereto, B: contacting the sensor surface with a control analyte, C: registering the sensor response from binding of the control analyte to binding sites of the ligand, D: determining the control saturation response (RmaxC) for the interaction between the control analyte and the ligand, E: transforming the control saturation response (RmaxC) to an analyte saturation response (RmaxA) using the relative molar response contribution of the analyte and the control analyte. F: contacting the sensor surface with one or more samples containing different concentrations of the analyte, G: registering the sensor response from binding of the analyte to the binding sites, and H: fitting the registered sensor response to a predetermined interaction model using the analyte saturation response (RmaxA) to determine the interaction parameters.

The invention discloses a low-complexity and adaptive saturation control method for a nonlinear system. The control method comprises the following steps of: firstly, converting control saturation nonlinearity into a linear model relative to an actual input signal by adopting a dead zone model; then, converting an original system with time-varying output constraint into unconstrained output constraint, and designing a new adaptive saturation control law along the filtered error manifold based on the system; and finally, by adopting the minimum learning parameter technology and the virtual errorconcept, only requiring update of two adaptive parameters on line to greatly reduce the calculation burden. Compared to the current work, the calculation amount of the adaptive scheme is small, and the asymptotic stability of the tracking error system can be ensured instead of the consistent final bounded stability. The adopted simulation shows that an improvement of about 4 times in tracking accuracy can be obtained, which demonstrates the effectiveness of the proposed control law.

The present invention relates to a control system (10) of a turbopropeller (1) including:a centralized control (24) configured to slave the screw propeller power PRW of the turbopropeller (1) to the screw propeller power set point PRWref and the screw propeller rotation speed XNP of the turbopropeller (1) to the screw propeller rotation speed set point XNPref, the centralized control (24) supplying fuel flow rate WF and screw propeller pitch β controls for the turbopropeller (1);a screw propeller rotation speed error limiter (12) saturating the screw propeller rotation speed error ΔXNP with a limiting valueΔXNPsat(min / max);a screw propeller power error limiter (11) saturating the screw propeller power error ΔPRW with a limiting valueΔPRWsat(min / max);

The invention discloses a tone mapping method for a high dynamic range image. The method comprises the following steps of: firstly, reading the high dynamic range image, and acquiring a log-domain brightness image of the high dynamic range image; secondly, estimating illumination components of the high dynamic range image by multi-scale weighted least squares (WLS) filtering to avoid the phenomenon of halo generated at a high light and shade contrast place; thirdly, recovering brightness components of the high dynamic range image by using a multi-scale Retinex method, eliminating the gray of a 1% part of each of two poles to prevent under-exposure and over-exposure, and adjusting the brightness degree of the image according to a self-adaptive adjustment function; and finally, recovering the color of the high dynamic range image by introducing an index control saturation method. The tone mapping method for the high dynamic range image is applicable to display and output of the high dynamic range image on low dynamic range equipment, generation of the halo can be avoided, and the displayed image has the characteristics of high contrast and good detail reproduction effect.

A crystallized cefathiamidine is prepared from the cefathiamidine solution through controlling pH to 3.5-6.5, adding proper solvent until the solution becomes cloudy, controlling saturation procedure and crystal growth speed while adding said solvent, separating and drying. Its advantage is uniform granularity. It can be used to prepare the medicines for treating the infection of staphylococcus aureus, pneumoccus, enterococcus, streptococcus, etc.

The invention relates to a multi-phase induction motor-specific subharmonic current suppression method, which includes the following steps: (A) current reference value processing; (B) current feedback value processing; (C) current regulation; (D) voltage reference value determination. Based on the vector control of a multi-phase induction motor, the method maps the current of the multi-phase motor into a corresponding synchronous rotating reference frame of a fundamental wave and each subharmonic orthogonal to each other by multiple synchronous rotating coordinate transformations, and uses proportional-integral controllers to respectively carry out tracking with zero steady-state error and combine to form an integral current controller. The method has the advantages that trapezoidal integration is adopted to increase integral accuracy, and supplemented by variable structure control, appropriate self-adaptive compensation is introduced to resist control saturation, so that static and dynamic performance is further enhanced; the method can suppress motor loss caused by the harmful subharmonic current of the multi-phase motor and the adverse affection of torque ripple, vibration noise and the like, and can utilize the positive effect of usable subharmonic; the method takes full advantage of the multi-phase motor, and enhances system performance.

The invention discloses a control method and system for a self-storage multi-terminal flexible straight system. The system controller is designed by using the reverse push method to realize the stability of the DC voltage and the rapid independent control of the active and reactive power. At the same time, a constraint command filter is introduced to solve the problem. The differential expansion and control saturation problems of reverse push control, and design compensation signals to solve the error problem of the filter, introduce adaptive control to ensure the robustness of the system to uncertain parameters, and use projection operators to optimize adaptive uncertain parameters , the control law of the system is designed based on the Lyapunov stability theory, which improves the anti-interference ability of the system and realizes the asymptotic stability of the whole system. Finally, a simulation model was built in the simulation software, and compared with the traditional PID control algorithm and the command filtering back-calculation algorithm, the simulation results show that the control method of the present invention has better robustness and dynamic response performance, and is a self-storage multi-terminal flexible The control algorithm of the straight system provides theoretical basis and technical support.

A control system (10) of a turbopropeller (1) including: a centralized control (24) configured to slave the screw propeller power PRW of the turbopropeller (1) to the screw propeller power set point PRWref and the screw propeller rotation speed XNP of the turbopropeller (1) to the screw propeller rotation speed set point XNPref, the centralized control (24) supplying fuel flow rate WF and screw propeller pitch β controls for the turbopropeller (1); a screw propeller rotation speed error limiter (12) saturating the screw propeller rotation speed error ΔXNP with a limiting valueΔ⁢⁢XNPsat⁡(min⁢ / ⁢max);and a screw propeller power error limiter (11) saturating the screw propeller power error ΔPRW with a limiting valueΔ⁢⁢PRWsat⁡(min⁢ / ⁢max).

A lithographic apparatus is presented that includes a controller having a series connection of at least two integrators and an integrator output circuit for deriving an output quantity of the series connection of integrators. The controller also includes an integrator saturator that is operatively coupled to the integrator output circuit and having an operating area for passing through the output quantity and a saturation area for saturating the output quantity. A saturation control mechanism for controlling saturation sets an output quantity of at least one of the series-connected integrators to a neutral value, when the integrator saturator is in the saturation area, except when the output quantity of or an input quantity of at least one of the series-connected integrators has a value such that it would tend to bring the integrator saturator from the saturation area to the operating area.

A quadrature filter-based inverter control method without an AC voltage sensor. Firstly, the quadrature filter is constructed by using the second-order generalized integrator’s non-difference following characteristic of the specific frequency AC signal, and then the voltage observer of the three-phase grid-connected inverter is constructed by using the quadrature filter, in the two-phase stationary coordinate system , using the measured grid side current signal and the inverter controller output bridge terminal voltage reference signal as the input of the voltage observer to observe the grid voltage; combined with the three-phase grid-connected inverter in the two-phase static coordinate system The PR control realizes the operation control of the inverter under the condition of no AC voltage sensor. This method can avoid problems such as integral saturation, initial value sensitivity, and static error that may occur in conventional no-AC voltage sensor control while maintaining the stability of inverter control. and other advantages.

A method for controlling the first, second and third variables of a turbine engine according to the first, second and third control variables of the turbine engine, each of which may be saturated according to an operating parameter of the turbine engine. The method comprises delivering a first multivariable correction (120) of a first value for the three control variables; selecting (130) a first control variable to be delivered as a function of the minimum value, the maximum value and a value determined by the first correction; delivering a second multivariate correction (140) of a second value for the second and third control variables; and selecting (150) the values of the second and third control variables to be delivered among the values determined during the first correction and the values determined during the second correction.

The invention discloses an undisturbed soil sample expansion force testing device capable of controlling the saturation. The device comprises a base supporting system, wherein a lower disc is fixed on the base supporting system, a cutting ring base and a cutting ring are arranged on the lower disc, and the upper part of the cutting ring base is provided with an upper cover; a central circular groove and an annular groove are formed on the lower disc, a soil pressure sensor is arranged in the central circular groove, an annular water penetration plate is arranged in the annular groove, water-immersion circular grooves are formed on the annular water penetration plate, water-permeable stones are uniformly placed in the water-immersion circular grooves, and the bottom of the annular groove is connected with an external water injection system through a pipeline; a soil sample is placed between the lower disc and the cutting ring, and a water-permeable plate base which is provided with a water-permeable plate and water-permeable holes is arranged on the top of the soil sample; and a plunger, overflow equipment and vacuum extraction equipment are arranged on the upper cover. The device effectively solves the problems that testing devices for an expansion back pressure method, a pressurization expansion method and a balance pressurization method have relatively large disturbance on soil sample structures, cannot effectively control strict saturation states and are relatively long in testing time consumption.

The double-roller casting system comprises a pair of casting rollers rotating in opposite directions, wherein an adjustable roller gap is formed between the casting rollers; a casting roll controller configured to adjust a roll gap between the casting rolls in response to a control signal; a cast strip sensor that measures a parameter of the cast strip and generates a strip measurement signal; and an iterative learning control (ILC) controller that receives the tape measurement signal and provides a control signal to the cast roll controller. The ILC controller includes a fault detection algorithm that receives the control signal and the tape measurement signal and generates a fault detection signal indicating when a fault condition is detected, and an iterative learning control algorithm that generates the control signal. The fault detection algorithm indicates a fault condition when it is detected that the control signal exceeds an upper control saturation threshold or the ILC controller operates in an instable state.