20 results about "Settling time" patented technology

The invention provides a self-adaptive preset time control method and system for a flexible mechanical arm, and relates to the field of control science and engineering.The self-adaptive preset time control method comprises the steps that a dynamic model of the flexible mechanical arm is built, and a nonlinear system state equation is deduced; constructing a time transformation function and a coordinate transformation function based on the system state equation; a time transformation function and a coordinate transformation function are utilized to construct an adaptive preset time controller, a dead zone compensator is connected to the output end of the controller in series, the ideal input control signal is compensated, and actual control input is obtained and acts on the flexible mechanical arm; a time transformation function is introduced into flexible mechanical arm control, a Lyapunov function and a self-adaptive estimation method are combined, an asymptotic tracking given tracking curve is finally output, global specified transient performance is guaranteed, performance indexes in the aspects of stable time and tracking precision can be pre-distributed offline according to task requirements, and the stability of the flexible mechanical arm is improved. And the method does not depend on an initial state and any design parameters.

The invention discloses a crisscross optimization robust model predictive control method for an automatic sweeping robot. The crisscross optimization robust model predictive control method is adaptive to a trajectory tracking system with parameter uncertainty. According to the method, a discrete time controlled system with parameter uncertainty, a reference trajectory system and a tracking error system are constructed, performance evaluation indexes are defined, the stable control gain range of a basic RMPC controller is determined by solving a minimum and maximum optimization problem and linear matrix inequality constraints, and a multi-objective optimization function is combined in the range to achieve the stable control of the RMPC controller. The optimal additional control gain is iteratively searched by means of a crisscross algorithm, an optimized controller is formed, the stability and the dynamic performance are considered, the influence caused by parameter uncertainty can be overcome, the rising time and the adjusting time of trajectory tracking are remarkably shortened, the tracking error and the energy consumption are reduced, and the tracking efficiency is improved. And the dual requirements of the automatic sweeping robot on real-time response and control precision are met.

This invention discloses a method for controlling the main steam temperature of a power generation boiler. The method includes collecting step response data of the main steam temperature of the power generation boiler, fitting the data using the least squares method, and establishing a mathematical model of the inertia region and lead-forward region of the main steam control channel of the power generation boiler. Then, a predictive compensation controller is introduced in the parallel feedback loop, and the lag component is separated as a separate term using a constant separation method. Next, the PID parameters are optimized using an artificial fish swarm algorithm, and the optimal solution is substituted into the original parameters. Smith predictive compensation control effectively eliminates the lag effect in the system model, shortens the system settling time, and the artificial fish swarm algorithm significantly improves the controller accuracy, effectively shortens the time for the system to reach the target value, reduces the system overshoot, and minimizes the impact of external disturbances.

The invention provides a heat pump frequent start-stop prevention control method based on fuzzy control and frequency gradual change, and the method comprises the steps: firstly constructing a fuzzy control model through a temperature difference and a change rate thereof, predicting a load change trend, and dynamically adjusting the width of a temperature control dead zone; then, combining the current frequency with a dead zone state to initialize a target frequency, and adopting a nonlinear frequency gradient path to realize smooth adjustment; in the low-frequency operation stage, a low-frequency stability factor is introduced to judge the operation state, time is accumulated only under the stable condition, and short-time frequency increasing oil return protection is triggered; and finally, when the temperature difference is continuously in a dynamic dead zone, the frequency is lower than a safety threshold value, the low-frequency stable time reaches the standard and the oil is not returned, the shutdown operation is executed. The heat pump system is converted from start-stop control to continuous flexible adjustment, the energy efficiency is effectively improved, the comfort is effectively improved, and the service life of equipment is effectively prolonged.

Logarithm (100) comprehensive an input amplifier (101), a logarithmic component (102), and a feedback capacitor (103) which is designed to stabilize the logarithm (100), characterized by the fact that the logarithm (100) comprises a switching device (110), and the feedback capacitance (103) is divided into a plurality of n partial feedback capacitances (103a, 103b, 103c) connected in parallel, wherein a first partial feedback capacitor (103a) is a permanently stabilizing component of the logarithm converter (100), and wherein a number of n-1 of the n partial feedback capacitors (103a, 103b, 103c) are switchable partial feedback capacitors (103b, 103c), wherein the n-1 partial feedback capacitors (103b, 103c) can be switched on separately as stabilizing components in addition to the first partial feedback capacitor (103a), and where the switching device (110) is configured to individually switch the n-1 switchable partial feedback capacitors (103b, 103c) depending on an input current (I Ph ) of the logarithm (100) to be automatically switched on or off and thus depending on the input current (I Ph ) of the logarithm (100) automatically increases or decreases an effective feedback capacity (103) with which the logarithm (100) is stabilized, wherein the effective feedback capacitance (103) corresponds to a sum of the first partial feedback capacitance (103a) and all switched-on switchable partial feedback capacitances (103b, 103c), and wherein the switching device (110) comprises • at least one reference current source (111, 111a, 111b), • at least one reference transistor (112, 112a, 112b), • at least one switching amplifier (113a, 113b), and • at least one switch (114a, 114b).

This invention provides a high-precision anti-disturbance control method for UAV gimbals under transient impact loads, belonging to the field of precision servo control technology. It employs a cascade control architecture: the outer loop uses model predictive control (MPC) and introduces control increment constraints to plan an overshoot-free velocity trajectory; the inner loop uses linear active disturbance rejection control (LADRC) and establishes an extended state observer to estimate and compensate for the total disturbance of multi-stage transient impacts in real time. This invention, using the aforementioned high-precision anti-disturbance control method for UAV gimbals under transient impact loads, reduces the settling time to 0.18 s and lowers the maximum dynamic position error during firing to 0.0005 rad, achieving precise steady-state maintenance under high-impact environments.

This invention discloses a method and system for tuning channel PI parameters based on contextual Bayesian optimization. The method includes: First, performing Bayesian optimization under multiple typical operating conditions with the objective of minimizing the settling time, constructing an offline stability knowledge base that integrates operating condition context information, and training a context-aware stability prediction Gaussian process model; Second, for the target operating condition, adaptively selecting knowledge transfer or local exploration paths based on model prediction uncertainty to construct a stability feasible region; Subsequently, within the feasible region, combining channel water level control accuracy and gate action stability indicators, dynamically constructing a comprehensive performance objective function and performing Bayesian optimization to obtain the optimal PI parameters; Finally, continuously updating the knowledge base and model through data closure. This invention achieves safe, efficient, and adaptive tuning of channel PI parameters under varying operating conditions, fundamentally ensuring the operational stability of the water conveyance system.

This invention belongs to the field of magnetic levitation bearing technology, specifically relating to a control method and system for magnetic levitation bearings. By combining auxiliary fourth-order LESO with integral sliding mode control, the anti-disturbance capability is significantly improved, and the suppression effect on various disturbances is superior to traditional control. By employing a saturation function and an external integrator, the problems of control chattering and integral saturation are solved. With the help of piecewise fal function TD and other designs, dynamic and steady-state performance are balanced, achieving zero steady-state error levitation and greatly shortening the settling time. The control method proposed in this invention features core parameter correlation design, requires no complex tuning, is compatible with existing hardware, and can be directly embedded into the controller, making engineering implementation simpler.

The invention discloses a satellite-borne anti-fuse FPGA (Field Programmable Gate Array) reinforcement protection method for avoiding high-power switching damage of a PIN (Personal Identification Number) switch, which comprises the following steps: an original control signal is generated through an SRAM (Static Random Access Memory) type FPGA, and the pulse width of the original control signal is at least the sum of the time of switch switching maximum time delay t1, radio frequency transmission and stabilization time t2, design margin t3 and effective switching window t4; a DA turn-off signal and an effective window signal are obtained from the original control signal in the anti-fuse FPGA. According to the method, a high-reliability scheme is realized by utilizing the satellite-borne anti-fuse FPGA, so that an electronic switch cannot be burnt out due to switching of various reasons when the power amplifier outputs high power. The method has high universality, solves the problems of weight and power consumption of the radio frequency front end of the integrated high-power base station especially in the design of high-integration-level products such as deep space exploration, and has wide application prospects.

This invention discloses a method and system for dynamic power matching in a heat pipe-cooled reactor. It obtains the steady-state value of the nuclear power corresponding to the target power and employs a strategy combining coarse and fine matching. The coarse and fine matching signals output from the power control system are weighted and summed to serve as the setpoint for the inner-loop control system. The inner-loop controller outputs control rods to reactively change the reactor nuclear power, thereby achieving power regulation. This significantly reduces overshoot, shortens settling time, provides superior control performance, and improves economic efficiency and safety.

The response index of the controlled object, such as the amount of overshoot and the settling time, is minimized by directly considering the response index, and the control parameters of the controller are optimized to design optimal control parameters. [Solution] By introducing the amount of overshoot and the settling time, which are in a mutually constrained relationship, as response indices of the controlled object into the terms of the unconstrained optimization evaluation function J, minimization that directly considers the response indices becomes possible. In a first aspect, one of the response indices is introduced into the objective function term, and the other response index is introduced into the constraint condition term, thereby introducing the response indices of the controlled object, which are in a mutually constrained relationship, into the terms of the unconstrained optimization evaluation function J. In a second aspect, the objective function is introduced into the terms of the unconstrained optimization evaluation function J as a weighted sum of two response indices, the amount of overshoot and the settling time, weighted by the coefficients (1-α) and α.

Frequency-selective feedback circuits and methods for an amplifier (particularly LNAs) that improve power supply rejection in feedback circuits, reduce non-linearities caused by low-frequency noise coupled to the input of the LNA, and improve settling times of the quiescent bias-point of the LNA. Some embodiments allow multiple modes of operation to allow selection of gain versus linearity characteristics. One aspect of the present invention includes an input matching feedback circuit configured to be coupled between an input terminal of an amplification core and a feedback node in the output signal path of the amplification core, the input matching feedback circuit including a power supply rejection resistor configured to provide a low-impedance path to a reference potential for low-frequency noise.

A power stage of a multi-phase switching converter detects faults reliably, and contains a high-side switch and a low-side switch connected in series between a first power terminal and a ground terminal. A gate driver generates drive signals to the two switches based on a control signal received from a phase controller. A fault logic block, powered at a second power terminal, generates (binary) deviation signals indicating whether or not a corresponding fault exists by examining states internal to the power stage. Ringing can occur at the ground and power terminals when the control signal switches between logic levels. The fault logic block generates fault signals by sensing the deviation signals according to a delayed version of the control signal, with the delay having a magnitude greater than a settling time of the ringing. By thus delaying the sensing of the deviation signals, any interference by the ringing is avoided.

This invention discloses a fractional phase-locked loop (PLL) based on multi-path quantization noise compensation. It introduces a data synchronization circuit based on the falling edge of the reference clock, ensuring that the divider signals of all paths have reached steady state before the phase detector is triggered by the next rising edge of the PFD, thus completely eliminating dynamic timing interference in the mixed-signal path. By introducing a multi-path retimer with a sign bit, the compensable quantization noise range is expanded. The current-DAC type charge pump proposed in this invention adopts a charge pump architecture based on a source switch array and a static discharge current. The source switch array utilizes the low impedance characteristics of the source nodes of the current source transistors, significantly improving the switching speed and reducing the settling time. The static discharge current forces the loop to maintain a fixed non-zero phase offset in the locked state, permanently shifting the charge pump operating point out of the nonlinear region and deeply suppressing fractional spurious emissions.

In the amplifier circuit, the rising settling time and the falling settling time are kept short. The amplifier circuit includes a first transistor of a first conductivity type having a first control terminal; a second transistor of a second conductivity type different from the first conductivity type, the second transistor having a second control terminal connected to an input terminal and a fourth current terminal connected to the first control terminal; a third transistor; and a fourth transistor of a fourth conductivity type different from the first conductivity type, the fourth transistor having a fourth control terminal connected to the first control terminal at an equal potential, and a seventh current terminal connected to a third fixed potential.

Disclosed is a differential chopper comparator, which includes an input terminal circuit that receives a first input signal and a second input signal and selectively switches the first and second input signals to intermediate circuit, at least one chopper circuit that generates a first amplified signal and a second amplified signal by amplifying a difference between the first and second input signals at the intermediate circuit points, a comparison circuit that compares the first amplified signal with the second amplified signal, digitizes the comparison result, and outputs a digital signal at a logic level, and a compensation circuit that offsets the first amplified signal and the second amplified signal and thereby removes kickback noise induced in the input terminal circuit. The differential chopper comparator of the present disclosure may shorten the settling time and may operate at high speed.

A method for testing a laser system includes defining at least one safety criterion, wherein the at least one safety criterion specifies a permissible range for controlling a laser of the laser system. The method further includes automated testing of the laser system on the basis of the defined at least one safety criterion. Also, the method includes initiating at least one action as a function of a result of the testing. The at least one safety criterion is selected from (i) a minimum and / or maximum value and / or a rate of change of a control variable of the control system, (ii) a minimum and / or maximum value and / or a rate of change of a manipulated variable of the control system, and (iii) a maximum settling time of the laser during a switch-on process. A computer program, a device, and a storage medium for this purpose are also disclosed.

The application discloses a trans-impedance amplifier for reducing the stable time of a burst mode optical receiver by using an external control method, which comprises an external control pin VC, a gain control signal generating unit, a trans-impedance amplifier and a variable gain amplifier. The burst mode trans-impedance amplifier needs to process a wide dynamic range of current, and needs to adaptively adjust its own gain according to different input currents to meet the output swing requirement. The method uses an external analog signal to control the gain of the trans-impedance amplifier, and controls the change of the external analog signal according to the input current value, and sends the analog signal into the gain control signal generating unit to generate the trans-impedance amplifier gain control signal and the variable gain amplifier gain control signal. The complexity of the circuit design is reduced by reducing the gain control loop of the trans-impedance amplifier and the variable gain amplifier, and the stable time of the gain control signal is reduced. The gain adjustment under different currents is realized by changing the size of the analog signal.

The application provides an adaptive preset time control method and system for a flexible mechanical arm, relates to the field of control science and engineering, and comprises the following steps: constructing a dynamic model of the flexible mechanical arm and deducing a nonlinear system state equation; constructing a time transformation function and a coordinate transformation function based on the system state equation; constructing an adaptive preset time controller by using the time transformation function and the coordinate transformation function, connecting a dead zone compensator in series at the output end of the controller, compensating an ideal input control signal, obtaining an actual control input, and applying the actual control input to the flexible mechanical arm; and the application introduces the time transformation function into the control of the flexible mechanical arm, combines a Lyapunov function and an adaptive estimation method, finally outputs asymptotic tracking of a given tracking curve, guarantees global prescribed transient performance, and makes the performance indexes in terms of the stable time and the tracking precision able to be pre-assigned offline according to task requirements, instead of depending on initial states and any design parameters.

The invention relates to the technical field of servo control, in particular to an anti-interference capability evaluation method for a nonlinear control system, and the method comprises the steps: converting the output of a nonlinear dynamic control system into Volterra series; performing finite order truncation on the converted output; converting the output after finite order truncation to a frequency domain to obtain a generalized frequency response function; and continuously adjusting the amplitude of the excitation signal until the range of the function cluster of the generalized frequency response function does not change any more, recording the stabilization time and the stabilization error of the function cluster of the generalized frequency response function at the moment, and completing the anti-interference capability evaluation of the nonlinear dynamic control system. According to the method, the generalized frequency response function of the nonlinear algorithm is analyzed based on the truncated Volterra series, the curve cluster of the frequency response function of the anti-interference isolation of the nonlinear control system is obtained, and a more comprehensive system anti-interference capability evaluation result is obtained.