63results about How to "Ease of physical implementation" patented technology

The invention discloses a micro-grid system voltage stability control method based on robust control. The control structure of an intelligent micro-grid system is composed of a system control layer, a concentrated control layer and a local control layer, and energy optimization and voltage and frequency stability control of the micro-grid system are realized through multi-layer coordination control. According to the micro-grid system voltage stability control method based on robust control, a comprehensive load module of an induction motor is established, wherein dynamic loads are connected with static loads in parallel. On the premise that the constraint conditions of system performance and robust stability are met, a micro-grid voltage stability robust controller is designed by the adoption of a method of solving the problem of mixed sensitivity so as to improve the micro-grid voltage stability. The micro-grid system voltage stability control method based on robust control can be adapted to wide-range change of load parameters, has high robustness for the situations that due to the factors such as changes of running conditions, influences of external environment and frequency switching of the loads, perturbation is generated in model parameters of a micro-grid and uncertainty exists in the topologic part and the unmolded part and can better restrain parameter drift and noise interference, and meanwhile, the controller is simple in structure and easy to realize.

The invention discloses an adaptive control system based on a radial basis function (RBF) neural network sliding mode control for a micro-electromechanical system (MEMS) gyroscope, and the system comprises a gyroscope and a control circuit, wherein the control circuit comprises a sliding mode controller and an RBF neural network; the difference of displacement of the three-axis gyroscope in the directions of three coordinate axes x, y and z and displacement of a reference model is taken as the input of the sliding mode controller. In the adaptive control system, an adaptive sliding mode control method is applied in controlling the gyroscope, so as to improve the stability and reliability of the system; and the RBF neural network is adopted to carry out adaptive learning on upper boundary of uncertain interference, thus reducing the influence of measurement error and external interference, effectively lowering the occurrence of buffeting, and achieving a better control effect.

The invention discloses a method for controlling a micro gyro based on a radial basis function (RBF) neural network sliding mode. Single-input single-output neural sliding mode control can be realized by using a switching function as the input of an RBF neural network, using a sliding mode controller as the output of the RBF network and using the learning function of the neural network; and a control effect can be achieved by integrating the advantages of sliding change structure control, an adaptive algorithm and the RBF neural network. The adaptive algorithm is used for adjusting the link weight of the RBF neural network in real time on line according to accessible conditions, so that a system finally achieves a sliding mode surface, completes tracking, and can adapt to sliding mode control strategies and timely correct and estimate all rigid errors, damping and the like; and the stability of a provided adaptive sliding mode controller exists according to the Lyapunov stability theorem, the system has good robustness, and digital simulation of the three-dimensional micro gyro proves that the method for controlling the micro gyro is valid.

The invention provides a method for simultaneously realizing remote state preparation and quantum remote control. The remote quantum state preparation method based on quantum remote control utilizes the quantum nonlocality of a three-particle GHZ state to simultaneously perform the remote preparation of an arbitrary single-particle state and realize the remote rotation on the particle state. The invention has the advantages that: the invention is based on sharing a three-particle GHZ state to complete the scheme of preparing arbitrary single-particle quantum state and loading rotation control;compared with the intuitive solution, the protocol of the invention has higher efficiency; only Pauli operator, controlled NOT gate, Bell state measurement, single particle measurement, EPR state, GHZ state and the like are use in the scheme of the invention, which is easy to be physically realized.

The invention discloses a method and a device for controlling a broadband sound field of a loudspeaker array by utilizing a secondary residual sequence. The method comprises the following steps: carrying out multichannel FFT (fast Fourier transform); carrying out multichannel multi-subband equilibrium processing; carrying out multichannel multi-subband phase delay processing; carrying out IFFT (inverse fast Fourier transform); and sending a multichannel time domain sequence to a multichannel power amplifier to drive the loudspeaker array to generate a uniform sound field. The device comprises a sound source, a multichannel FFT transformer, a multichannel multi-subband equalizer, a parameter estimator for multichannel equilibrium, a multichannel multi-sub-band phase delayer, an optimal phase delay estimator, a multichannel IFFT transformer, the multichannel power amplifier and the loudspeaker array which are successively and sequentially connected. The method and the device can be used for effectively expanding the coverage area of a broadband array space radiation sound field and improving the uniformity degree of the broadband array space radiation sound field, so that the requirement on the sound field space distribution quality of a broadband array sound amplification system is met.

The invention discloses a sliding mode variable structure-based load disturbance resistance control system of a bearingless induction motor. Output ends of a speed and position detector and a third 2/3 coordinate transformation module of a torque control section are connected to an input end of an extension sliding mode observer; an output end of the extension sliding mode observer is connected toan input end of a fractional order integration sliding mode controller; an output end of the fractional order integration sliding mode controller is connected to a second current feedback-type pulsewidth modulator through an air gap field orientation control model and a second 2/3 coordinate transformation module in order; the output end of the second current feedback-type pulse width modulatoris separately connected to a motor and the third 2/3 coordinate transformation module; and the output end of the third 2/3 coordinate transformation module is connected to the fractional order integration sliding mode controller through the extension sliding mode observer. Fractional order integration sliding mode is employed for substituting for an integer order integration link, and therefore, interference in a system by external disturbance is effectively reduced, rotating speed can prevent from being disturbed by load changes, and the dynamic and static performance and the load disturbanceresistance capability of the system are improved.

The invention relates to a data frame filling method of multi-modulating modes transmission system, which selects the data processing mode through time domain / frequency domain; when no reference information is inserted into the single carrier wave time domain processing: data requiring single carrier wave time domain processing is under increased sampling; data requiring multi carrier wave frequency domain processing is under processing of interpolation of pilot signal / strongly protected unknown information, afterwards the output data is under processing of interpolation of virtual sub-carrier wave, and finally output under processing of interpolation of virtual sub-carrier wave is under IFFT processing; when reference information is inserted into the single carrier wave time domain processing, and the inserted reference information number L is equal to the inserted pilot signal / strongly protected unknown information number N: data requiring single carrier wave time domain processing is under processing of interpolation of reference information, inserted with reference information formed by L = N signs, and then output data under processing of interpolation of reference information is under increased sampling; data requiring multi carrier wave frequency domain processing is under processing of interpolation of pilot signal / strongly protected unknown information, afterwards the output data is under processing of interpolation of virtual sub-carrier wave, and finally output under processing of interpolation of virtual sub-carrier wave is under IFFT processing.

The invention discloses a controlling system for an IGBT type cascade speed control system active power filter. The controlling system for the IGBT type cascade speed control system active power filter comprises a mathematical model building unit, a linearization unit, a variable structure controlling unit and a controlling signal output unit, wherein the mathematical model building unit is used for building mathematical models of an inverter in a three-term stationary coordinate system and carrying out Park conversion to change the mathematical models into the mathematical models in a dq0 coordinate system; the linearization unit is used for carrying out accurate state feedback linearization on the mathematical models in the dq0 coordinate system; the variable structure controlling unit is used for designing the control law of inverter alternating current side current components in an index reaching law method, and a final system controlling input quantity is obtained; the controlling signal output unit is used for obtaining the driving controlling signals of the inverter after the input quantity is controlled by the system, and Park inverse transformation and sine pulse width modulation are conducted on the input quantity. The controlling system is simple in design and strong in robustness, when parameters of the system are disturbed internally or disturbed by external factors, the controlling system still can effectively restrain the non-power-frequency components, and the motor rotation speed adjusting effect is good.

The invention discloses a vehicle ISD suspension active control method based on model reference adaptive control. The method comprises the following steps: (1) establishing a suspension controlled model and a reference model; (2) defining a generalized state error e between the controlled model and the ideal reference model; (3) rewriting a coefficient matrix; (4) judging the stability of the adaptive control system; and (5) determining an adaptive law. A controlled ISD suspension system with a simple structure can track the output of the complex ideal ISD suspension model, and the comprehensive performances of the suspension are improved. The method provides a new research thought and direction for the design and application of the ISD suspension of the vehicle, especially for the research of the controllable ISD suspension.

The invention discloses a steer-by-wire system control method based on a sliding mode compensator. The method comprises acquiring a front wheel rotating angle [delta]f and a steering wheel rotation reference angle [theta]hr; defining a tracking error [epsilon][theta] as a difference value between the front wheel rotating angle [delta]f and the steering wheel rotation reference angle [theta]hr; inputting three variables, as inputs, which are described in the specification and obtained in combination with robust differentiators to the sliding mode compensator and a nominal control for calculation to obtain u0 and u1, wherein the u0 is used for processing a lumped-uncertainty compensator signal, and the u1 is a nominal control signal; setting that a closed-loop control input signal u is composed of two parts in view of uncertainty in the steer-by-wire system, namely u = u0 + u1; and sending the closed-loop control input signal u to a steer-by-wire system device to send a voltage instruction to a steering motor, thereby controlling the wheels to turn and obtaining a ideal front wheel rotating angle [delta]'f.

The invention discloses a method of controlling a single-joint assisting exoskeleton sliding mode. The method comprises the steps of firstly collecting the signal of a multi-axis force sensor on a shank; converting a force of a contact point of the multi-axis force sensor into an expected speed of the contact point by a real-time controller, and further obtaining an expected angle of a knee joint through operation; outputting a voltage signal for controlling an electro-hydraulic servo valve by collecting and operating the angle information of a rotary encoder by the real-time controller; converting the voltage signal into a current signal of the electro-hydraulic servo valve by a servo valve amplifying board; realizing the control on a flow flowing into a hydraulic cylinder according to the size of the current signal by the electro-hydraulic servo valve, and further realizing the control on a piston position of the hydraulic cylinder. The method of controlling the single-joint assisting exoskeleton sliding mode, disclosed by the invention, has the characteristics that the response is quick, the reaction on parameter variation and disturbance is insensitive, on-line system identification is not needed, physical realization is simple, and the like.

The invention provides an arrangement for realizing multifunctional single-phase digital watthour meter which comprises, three ways of analog-digital converter (ADC), at least two groups of effective value arithmetic elements and an electricity stealing judgment unit, at least a power arithmetic element and at least a numerical frequency conversion element, the electricity stealing judgment unit includes an electricity stealing judgment logic circuit and a read-write register, which configures different electricity anti-theft judgment normalized value according to different environment of applications, the electricity stealing judgment logic circuit proceeds judgment computation based on the effective value of the two ways of electric current and value configured in the register, and sends out the electricity stealing signal and right current instantaneous value for participating the power computation, the power arithmetic element calculates the energy power, and the numerical frequency conversion unit completes the impulse output conversion.

The invention discloses a control method of a grid-connected inverter for a wave power generation system. According to the method, the mathematical model of the grid-connected inverter of the wave power generation system is established; and the error-free tracking of a power grid reference voltage by the output voltage of the inverter is realized through controlling the duty ratio of the power tube switch of the inverter. In order to achieve fast and error-free tracking, a reinforcement learning algorithm-based global fast terminal sliding mode control strategy is adopted; and the fast terminal sliding mode control strategy is compensated in real time by means of interaction between a reinforcement learning algorithm and the environment, so that the inverter has self-learning capacity foroutside interference, and therefore, the robustness and stability of the system can be enhanced.

The invention discloses an intelligent steering control method for an electric vehicle with two hub motors and relates to the control of driving stability of the vehicle with improved steering performance. The intelligent steering control method utilizes a staged strategy to divide the speed of the vehicle into three stages to cope with steering situations at different speeds, wherein the speed isless than 20km/h in a low-speed stage; the speed is greater than or equal to 20km/h and less than or equal to 40km/h in a medium-speed stage; and the speed is greater than 40km/h in a high-speed stage. Through the correspondence to different sliding-mode controllers which comprise a centroid deflection angle sliding-mode controller, a combined sliding-mode controller and a yaw rate sliding-mode controller and through the torque distribution, the intelligent steering control is achieved so as to overcome the defects in the prior art that the stability of the whole vehicle, the real-time performance of steering and safe steering requirements in different speed stages can not be ensured at the same time in the steering process of the vehicle, and that the robustness of open-loop control is poor.

The invention provides a multi-modulation transmission system and a data frame filling method thereof, which relate to the field of digital information transmission, wherein the data frame filling method of the multi-modulation transmission system performs data frame filling after channel coding and mapping, and the data frame filling comprises single-carrier time-domain processing and multi-carrier frequency-domain processing and comprises the following steps: selecting the single-carrier time-domain processing or the multi-carrier frequency-domain processing by a time-domain or frequency-domain selecting module; according to the selection result, performing the processing of inserting reference information on data requiring the single-carrier time-domain processing, wherein the symbolic number of the inserted reference information is L; and according to the selection result, performing the processing of inserting pilot signal or strongly protected unknown information on the data requiring the multi-carrier frequency-domain processing, wherein the symbolic number N of the inserted pilot signal or the strongly protected unknown information is equal to the symbolic number L of the inserted reference information, and the output data are processed by discrete Fourier inverse transform.

The invention relates to a four-order conservative chaotic oscillator which comprises capacitors C1 and C2, inductors L1 and L2, resistors R1 and R2 and an operational amplifier U. The inductor L1 isconnected with the capacitor C1 in parallel. The positive electrode of the capacitor C1 is connected with the in-phase input end of the operational amplifier U, and the negative electrode of the capacitor C1 is grounded. The resistor R1 is connected between the inverting input end and the grounding end of the operational amplifier U. The resistor R2 is connected between the output end Vo and the inverting input end of the operational amplifier U. And the capacitor C2 and the inductor L2 are connected in series and then are connected between the output end Vo and the in-phase input end of the operational amplifier U.

The invention discloses a scanning trajectory design method for MRI (magnetic resonance imaging) and a device thereof. According to the technical scheme of the invention, the method comprises the steps of generating a Rosette sampling track; intercepting a section of a single track from the generated Rosette sampling track; rotating the single track about an origin to obtain a K-space scanning track; adopting the K-space scanning track as a scanning track for compressed perceptual magnetic resonance imaging or spectrum imaging, and collecting magnetic resonance signals. According to the technical scheme of the invention, based on the scanning trajectory design method for MRI (magnetic resonance imaging) and the device thereof, the Rosette track is introduced into the compressed perceptual magnetic resonance imaging process, so that the physical realization of magnetic resonance having a continuous gradient is realized conveniently. In addition, the method and the device are better in incoherence. Therefore, the constraint condition of the compressed perceptual magnetic resonance imaging process can be met and the feature of variable-density sampling is realized.

The invention provides a flexible memristor with a self-repairing capability and a production method. The method comprises the steps: taking a metal sheet as a memristor positive electrode, taking manganese dioxide deposited on carbon fiber paper (CFP) as a memristor negative electrode, taking a ZnSO4-MnSO4 weak acid solution as an electrolyte solution, and carrying out an oxidation/reduction reaction on a manganese dioxide film through the diffusion of ions in the solution. A structure capable of generating an electrochemical reaction spontaneously is formed, and the resistance change of the memristor is realized. According to the invention, the liquid electrolyte is used as the dielectric layer, and the memristive performance is realized by a thin film layer formed by the oxidation/reduction reaction of the liquid electrolyte and the negative electrode so that the reaction efficiency is improved by utilizing the interface reaction, the ion concentration can be adjusted according to different requirements, and the adjustment of the memristive performance is further realized. The invention provides the production method of the liquid flexible memristor, which is easy to realize physically, simple in production process, stable in quality, high in circularity, low in cost and high in production efficiency.

The invention discloses a biodegradable memristor array with an information storage function and a preparation method, and relates to a flexible electronic device. The memristor array is of a vertical four-layer net structure and is provided with an upper electrode array, a dielectric layer, a lower electrode array and a flexible silk fibroin film substrate from top to bottom in sequence. The upper electrode array is a strip-shaped metal electrode array; the dielectric layer is of a three-layer structure composed of an upper degradable silk fibroin film layer, a lower degradable silk fibroin film layer and a conductive substance wrapped between the upper degradable silk fibroin film layer and the lower degradable silk fibroin film The lower electrode array is a strip-shaped metal electrode array, and the lower electrode array is perpendicular to the upper electrode array to form a net-shaped structure; the flexible silk fibroin film substrate is a transparent flexible silk fibroin film made of natural biological materials. And the device has stable performance and stable switching performance. The device has good mechanical toughness, still keeps complete memristive performance after multi-angle bending, and is easy to complete physical implementation of electronic products. The preparation process is simple, the operation is simple and convenient, the array preparation efficiency is high, the cost is low, and the device is degradable.