10 results about "Settling time" patented technology

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.

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.

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.

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.

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.