31results about How to "Achieve optimal performance" patented technology

The invention provides an unmanned surface vessel full state constraint trajectory tracking control method based on the saturation compensation technology, relates to the unmanned surface vessel fullstate constraint trajectory tracking control method, and aims at solving the problem of high control error caused by the fact that the present control method for unmanned surface vessel trajectory tracking control does not process the problem of state constraints and saturation. The unmanned surface vessel full state constraint trajectory tracking control method comprises the steps that step one,the kinetic model of the unmanned surface vessel is established; step two, a saturation compensation auxiliary system is designed according to the kinetic model of the unmanned surface vessel established in the step one; step three, the saturation function of the unmanned surface vessel control law is established according to the saturation compensation auxiliary system designed in the step two; step four, the closed-loop system of the unmanned surface vessel is established; step five, the external interference is processed by using the adaptive method so as to obtain the adaptive estimation error; and step six, full state constraint trajectory tracking control of the unmanned surface vessel can be realized according to the adaptive estimation error obtained in the step five. The unmannedsurface vessel full state constraint trajectory tracking control method based on the saturation compensation technology is used for the field of trajectory tracking control.

The invention is applicable to the technical field of flash memories and provides a method and a device for managing a multilayer unit flash memory, and storage equipment. The method comprises the following steps of: calculating a storage address of the lowest effective bit page in the multilayer unit flash memory; and writing important data and frequently written data into the storage address corresponding to the lowest effective bit page. In the embodiment of the invention, the important data and the frequently written data are written into the storage address corresponding to the lowest effective bit page, the characteristic of the multilayer unit flash memory is used fully and the optimal performance of the multilayer unit flash memory is realized, so the reading-writing speed of the multilayer unit flash memory is increased and the stability of the multilayer unit flash memory is enhanced.

The invention discloses a modular multilevel converter system and a control system and control method of the modular multilevel converter system. An upper computer control layer comprises an operation personnel monitoring system, wherein the operation personnel monitoring system is connected with a system control unit. A system-level control layer comprises the system control unit, wherein the system control unit connected with a valve control unit. A valve-level control layer comprises the valve control unit, wherein the valve control unit issues sub-modular trigger pulse signals to sub-modular controllers. A modular-level control layer comprises the sub-modular controllers, wherein the sub-modular controllers are arranged in sub-modulars of a modular multilevel converter valve in a dispersed mode, and each sub-modular controller is used for having control over connection and disconnection between an upper power modular and a lower power modular of the corresponding sub-modular. Integrated control over a whole modular multilevel converter is achieved at different control priority levels by adopting a layered structure with a plurality of control units according to the requirement of the modular multilevel converter for special control, and the good foundation is laid for large-scale engineering application of the modular multilevel converter.

The invention provides an antenna tuning parameter processing method and a mobile terminal. The processing method comprises steps: a communication processor receives data reported by a sensor of the mobile terminal when the mobile terminal is in a communication state procedure, or a data transmission state procedure; the communication processor determines a scenario in which the mobile terminal islocated according to the data reported by the sensor, wherein the scenario in which the mobile terminal is located is used for identifying a relative position relationship between the mobile terminaland a user of the mobile terminal; the communication processor obtains a pre-stored antenna tuning parameter corresponding to the scenario in which the mobile terminal is located, and writes the antenna tuning parameter into an antenna tuner. Through a mode of tightly coupling the communication processor and the sensor, real-time updating of the antenna tuner scenario is realized.

The invention discloses a method and a device for message transmission. The method includes the steps as follows: a sender sets asides at least two queue elements for a control channel when the control channel is in an idle state and sets asides at least N+1 queue elements for the control channel when N control messages are to be sent; the sender fills up a control transmission negotiation request message to a sending queue for sending before sending the control message and controls the number of data messages which are sent by a data channel to be not exceed a preset value before receiving a corresponding control transmission negotiation response message; and the sender respectively sets a first sign to the N control messages and then fills up the control messages to the sending queue for sending after receiving the corresponding control transmission negotiation response message. The invention realizes reasonable distribution of bandwidth of a logical channel on a physical channel and can avoid channel jamming when the control messages are transmitted.

The invention discloses a corrosion model test method of a through-flow turbine. The conductivity of a water medium can be reasonably calculated according to the size of a real turbine so that a solution can be prepared; by carrying out reasonable distribution and current regulation on electrodes having the auxiliary anode effect and selecting a reasonable part to test potential distribution, the effects of optimizing the number of the required electrodes and potential distribution and directing the design of an electrochemical protection scheme of the real turbine can be achieved. Meanwhile, the potential problems of uniform corrosion, spot corrosion, crevice corrosion, galvanic corrosion and the like in a through-flow turbine model can be evaluated and prejudged through a model test, and reference can be provided for design and manufacturing of a real set.

The invention discloses an electromagnetic bearing switching power amplifier for modular series. The electromagnetic bearing switching power amplifier comprises a digital controller, a current sensor, a signal conditioning circuit and at least one power module; two ends of the power modules connected in series in a modular way are used as voltage input ends; after being connected in series, the current sensor and a load are used as an output end connected in the power modules; the output end of the current sensor is connected with the digital controller through the signal conditioning circuit; the digital controller is connected to various power modules, and controls connection among the various power modules and the internal conduction state of each power module; and thus, the performance and the requirement of the portability of the switching power amplifier are achieved. The electromagnetic bearing switching power amplifier can be flexibly selected and put into use; the optimal performance of the switching power amplifier is realized; the power modules are uniformly designed and convenient to replace; faults can be simply removed; compared with a power amplification device using a high-voltage device, the working efficiency of the switching power amplifier used in a low-voltage working occasion is relatively high; and the loss is relatively low.

An error-handling method, a data storage device and controller thereof are provided. The error-handling method may include: uploading an error-handling program to a buffer memory equipped with error correction code (ECC) protection capability; in response to at least one error, interrupting execution of a current procedure and activating an interruption service; executing the error-handling program on the buffer memory (116); disabling a transmission interface circuit; resetting at least one hardware engine and at least one NV memory element; performing cache rearrangement regarding a data cache within the data storage device, and programming rearranged cache data into the NV memory element, to perform data recovery; and through activating a watchdog module and the transmission interface circuit and relinking with a host device, completing soft reset to make the data storage device operate normally again. According to the invention, the data storage device can be self-repaired when a soft error occurs, so that the soft error rate is reduced.

The application belongs to the technical field of aviation power distribution, and particularly relates to a method for charging a storage battery by an aviation power distribution product charger. The method comprises the following steps: when the voltage of a storage battery is lower than a first preset voltage value, entering a trickle charging mode, performing trickle charging on the storage battery at a first constant current by the charger to enable the voltage of the storage battery to rise to a second preset voltage value; entering a constant-current charging mode, performing constant-current charging on the storage battery by the charger at a second constant current to enable the voltage of the storage battery to rise to a third preset voltage value, and recording the constant-current charging time; entering a constant-voltage charging mode, performing constant-voltage charging on the storage battery by the charger at a first constant voltage, and keeping the preset constant-voltage charging time; determining whether the charging current is larger than a preset current value or not, if so, returning a constant-current charging mode, and if not, entering a floating chargingmode, and conduct floating charging on the storage battery at second constant voltage by the charger. The problem that the storage battery is not fully charged is solved, and the safety is improved.

The invention discloses a novel intelligent photocatalyst mosquito-killing bulb lamp. The novel intelligent photocatalyst mosquito-killing bulb lamp comprises a base assembly, a lamp housing, a locking cover and a lampshade, wherein the base assembly, the lamp housing, the locking cover and the lampshade are fixedly installed in sequence from top to bottom; a first base plate is embedded in the top of the locking cover, several ultraviolet lamp beads are uniformly distributed on the bottom face of the first base plate in the circumferential direction of the first base plate, a second base plate is arranged on the locking cover, and several LED lamp beads are uniformly distributed on the bottom face of the second base plate in the circumferential direction of the second base plate; a transparent base and a high-voltage power grid sleeving the base are arranged between the lamp housing and the locking cover, the base comprises a light-transmittance cylinder with two through ends, the topface of the light-transmittance cylinder abuts against the first base plate, the bottom face of the light-transmittance cylinder abuts against the locking cover, and the ultraviolet lamp beads are located in the light-transmittance cylinder. The photocatalyst mosquito-killing bulb lamp is reasonable in structure, and is matched with the ultraviolet lamp beads which are used for attracting mosquitoes and giving out light of a specific wavelength, and the mosquito killing and illumination effects are good.

The invention discloses a control case for an urban rail vehicle, a communication method and a control system. The control case includes a case body disposed in a shielding case. The case body includes a case backplane and a case plug-in. The shielding case also comprises a communication processing module therein that converts communication signals of different standards into high-speed serial signals. The communication processing module is provided with more than one connector to communicate with different external communication devices in different standards. The communication processing module is separate from and connected with the case body. The case plug-in performs high-speed serial signal transmission with the communication processing module through the case backplane. The controlcase has the advantages of simple structure, small depth, good communication quality and shielding performance, and a controllable communication node branch wire harness length.

The present invention provides a method and an apparatus for spatial reuse enhancement in a multi-station environment. The method comprises the following steps: if the wireless communication device receives a receiving packet, checking a space reuse limit to carry out a first-stage space reuse judgment; if the space reuse limit meets the preset condition, triggering a transmission module to starta second-stage space reuse judgment; scanning at least one contention queue to obtain an index of the candidate station from the at least one contention queue; obtaining latest information of the candidate station from an internal database of the wireless communication device based on the index so as to calculate a threshold value special for the candidate station according to the latest information; and comparing an intensity indicator corresponding to the received packet with the threshold to generate a comparison result, so as to control triggering of a spatial reuse contention channel according to the comparison result.

The invention discloses a coordination evaluation method and system based on high and medium voltage power distribution network grid structures. The method comprises the following steps: analyzing the power supply safety levels of the high and medium voltage grid structures in N-1 and N-1-1 outage scenes under corresponding group load levels from a high-voltage level and a medium-voltage level through employing the power supply safety standard of an urban power grid; calculating a reliability index of the high-and-medium-voltage power distribution network and comprehensive annual cost of the high-and-medium-voltage grid structure by using a coordinated calculation strategy; and evaluating various high and medium voltage power distribution network grid structure combination schemes by using the power supply safety level, the reliability index and the comprehensive cost, and judging the superiority of the various combination schemes. According to the method, coordinated optimization of the grid structure of the high-and-medium-voltage power distribution network can be realized, and the investment of capital cost is reduced while the power supply quality is improved, so that the overall optimality of planning and transformation of the high-and-medium-voltage power distribution network is realized.

The invention discloses a flexible DC configuration method and system for suppressing two-DC simultaneous commutation failure. The method comprises steps that multiple subareas of the grid and transmission sections among the subareas are determined; fault checking is performed, and a first AC fault area causing two-DC simultaneous commutation failures is determined; a flexible DC configuration candidate line set between two converter stations is determined; electrical distances among high voltage buses of two DC receiving inverter stations are respectively calculated on the condition that flexible DC is mounted in different lines; the electrical distances are arranged in descending order, a line configuration order set of the flexible DC is determined, and lines in the line configuration order set are respectively sequentially selected as the current line; the flexible DC is mounted in the current line, fault checking is further performed, and a second AC fault area is determined; a commutation failure suppression effect index is calculated, the commutation failure suppression effect index is compared with the preset index threshold, and a flexible DC configuration scheme is determined on the basis.

The invention discloses a clock fault detector, and the detector comprises a time sequence control signal generator and a clock fault detection module which can respectively generate a control signal according to a clock signal and perform clock fault detection according to the control signal respectively. The clock fault detection module may include a first integrator, a sample hold circuit, a second integrator, and a comparator. The first integrator can convert previous clock periods of the clock signals into reference voltages according to ping-pong mode control signals in the control signals. The sampling and holding circuit can sample and hold the reference voltage according to the ping-pong mode control signal; the second integrator can convert the current clock period of the clock signal into a ramp signal; and the comparator can compare the ramp signal with at least one reference voltage to generate a comparison result signal for indicating whether the clock signal is normal or not. Compared with a traditional architecture, the clock fault detector has higher precision in process, and can enable the electronic device to achieve optimized efficiency.

The invention discloses a zigbee equipment power setting method. The method comprises: a gateway acquiring a power number reference value; and when the sub-equipment is connected with the gateway, thegateway setting the maximum power of the sub-equipment according to the power value reference value. Compared with the prior art, the method has the following beneficial effects: based on different regulations of maximum values of transmitting power of different countries, the power of the equipment is adjusted to the maximum within a legal compliance range, and the optimal performance of the equipment is realized.

The invention discloses a method and a device for message transmission. The method includes the steps as follows: a sender sets asides at least two queue elements for a control channel when the controThe invention discloses a method and a device for message transmission. The method includes the steps as follows: a sender sets asides at least two queue elements for a control channel when the contro avoid channel jamming when the control messages are transmitted.can avoid channel jamming when the control messages are transmitted.l channel is in an idle state and sets asides at least N+1 queue elements for the control channel when N control messages are to be sent; the sender fills up a control transmission negotiation requestl channel is in an idle state and sets asides at least N+1 queue elements for the control channel when N control messages are to be sent; the sender fills up a control transmission negotiation request message to a sending queue for sending before sending the control message and controls the number of data messages which are sent by a data channel to be not exceed a preset value before receiving amessage to a sending queue for sending before sending the control message and controls the number of data messages which are sent by a data channel to be not exceed a preset value before receiving acorresponding control transmission negotiation response message; and the sender respectively sets a first sign to the N control messages and then fills up the control messages to the sending queue forcorresponding control transmission negotiation response message; and the sender respectively sets a first sign to the N control messages and then fills up the control messages to the sending queue forsending after receiving the corresponding control transmission negotiation response message. The invention realizes reasonable distribution of bandwidth of a logical channel on a physical channel and sending after receiving the corresponding control transmission negotiation response message. The invention realizes reasonable distribution of bandwidth of a logical channel on a physical channel and can

The invention discloses a method for performing page availability management of a memory device, an associated memory device and electronic device, and a page availability management system. A methodfor performing page availability management of a memory device, the associated memory device and electronic device, and page availability management system are provided. The method may include: obtaining a set of page Error Correction Code (ECC) error tables of a non-volatile (NV) memory; based on a predetermined rule, finding respective local risky pages of at least one portion of blocks within aplurality of blocks according to the set of page ECC error tables, respectively, to generate local risky page counts respectively corresponding to page indexes; finding one or more global risky pagescorresponding to one or more page indexes of the multiple page indexes according to the local risky page counts; and writing a global risky page table into the memory device, for controlling the memory device to skip using the one or more global risky pages of each of the plurality of blocks.

The invention discloses a high-quality waveguide structure and a preparation method thereof. The preparation method comprises the steps of plating a metal chromium film on the surface of a lithium niobate film, directly writing the chromium film by femtosecond laser as a mask layer, conducting chemical mechanical polishing, performing chemical vapor deposition, bonding the lithium niobate film and the like. The preparation process of the method optimizes the configuration of the waveguide prepared by the chemical mechanical polishing process, has the characteristic of ultralow transmission loss and excellent electro-optical characteristic, provides a key step for realizing industrialization of the lithium niobate photonic device, and can promote the development of micro-nano photonics, integrated optics and microwave photonics.

The present invention provides a method for processing antenna tuning parameters and a mobile terminal. The processing method includes: when the mobile terminal is in a call state or in a data transmission state, a communication processor receives data reported by a sensor of the mobile terminal; The communication processor determines the scene where the mobile terminal is located according to the data reported by the sensor; wherein the scene where the mobile terminal is located is used to identify the relative positional relationship between the mobile terminal and the mobile terminal user; the The communication processor acquires pre-stored antenna tuning parameters corresponding to the scene where the mobile terminal is located, and writes the antenna tuning parameters into the antenna tuner. In the embodiment of the present invention, the real-time update of the scene of the antenna tuner is realized by tightly coupling the communication processor and the sensor.