255results about How to "Realize synchronous control" patented technology

The invention relates to a multi-scene streaming media courseware recording and direct-broadcasting method, which is characterized in that a recorded teacher camera video multimedia file is synchronized with a screen video multimedia file through a screen video key frame interpolation algorithm in recording; real-time video stream and real-time audio stream are coded to a transport stream (TS) file by synchronously encapsulating and multiplexing a video (PES) photoelectric scanning packet and an audio PES packet to be distributed to a web direct-broadcasting server, the teacher camera video and the screen video are synchronously broadcasted through the multi-video-source synchronous direct-broadcasting control. The method supports the windows / Linux cross-platform run and also supports the multi-source recording and stream direct-broadcasting technology of the teacher camera video, the teacher audio and the screen video, and the media courseware can be directly broadcasted while being recorded.

The invention discloses a signal synchronization method used for UWB high-precision positioning system. The method comprises the following steps that: (a) a signal synchronization platform is established, wherein the signal synchronization platform comprises a synchronization controller and N base stations used for UWN high-precision positioning, the synchronization controller is connected with a receiving end of the first base station through a wired transmission medium, and the base stations are successively cascaded; (b) the base stations successively receive and forward a clock synchronization signal emitted by a synchronization signal generation device of the synchronization controller and respectively reset high-precision timing clocks of the base stations; (c) after each base station receives a UWB positioning information code, the clock number of the high-precision timing clock of each base station at the moment is recorded, and the time delay value between any two base stations is obtained; and (d) the time delay value is used as a correction value and is added to the time information of the corresponding base station, and the synchronous timing of the base stations is realized. By adopting the above method, the precise signal synchronization among the base stations is realized.

The invention discloses a method for realizing the synchronous control of a distributed system, a host of the distributed system periodically sends a call packet, the call packet is taken as a synchronous signal of the whole distributed system, all slaves in the distributed system produce received interrupt after receiving the call packet, thereby triggering the external interrupt, and the synchronous control is implemented at the initial time of the external interrupt; and the synchronous control is implemented from the delay of the host to the initial time of calling the external interrupt by the slaves, thereby realizing the synchronous control of the whole distributed system. Meanwhile, the invention also discloses a system for realizing the synchronous control of the distributed system based on an RS485 network. The proposal of the invention does not need to increase an additional clock cable in the distributed system and only needs a simple hardware circuit to be matched with a software process which is easy to realize, thereby realizing the synchronous control of the distributed system; furthermore, the required hardware cost is very low, thereby being simple and easy to operate and having great practical value.

The invention relates to a system and a method for improving the read-write success rate of radio frequency identification (RFID) tags on a movement production line. The system consists of a production management application server, read-write control, data detection, error correction control and security protection; the read-write control, the data detection, the error correction control and the security protection are respectively connected with the production management application server through a wired network and / or a wireless network; four different terminals using a computer, RFID, automatic control and the like and the production management application server execute tasks respectively set and are tightly matched; the data in the RFID tags is subjected to the functions, such as precise identification, multiple writing, verification, information protection, and automatic sorting of failure lags on the movement production line; the read-write success rate of the RFID lags data on the movement production line is remarkably improved; the productive efficiency is optimized; and the intelligent management for the production line is realized, so the system and the method provided by the invention have excellent polularization and application prospects on the modern industrial production line.

The invention discloses an ultra-wideband high-bandwidth radio frequency two-way transceiving integrated integration module, belonging to the technical field of wireless information transmission. Themodule comprises a main control unit, a power supply unit, a microwave frequency synthesis unit, a radio frequency transmission unit, a radio frequency receiving unit, a digital signal processing unitand a radio frequency transceiving control unit, wherein the main control unit is mainly used to complete bus driving, data interaction, signal processing and other functions; the power supply unit is used to provide a high-stability and low-noise power supply; the microwave frequency synthesis unit, the radio frequency transmission unit, the radio frequency receiving unit and the digital signalprocessing unit adopt a microwave frequency synthesis technology, a wideband frequency conversion technology, a signal conditioning technology, a wideband modulation and demodulation technology and adigital signal processing technology to achieve the maximum one-way 8*8 or two-way 4*4 radio frequency transceiving; and the radio frequency transceiving control unit is used to achieve radio frequency transceiving control. The radio frequency two-way transceiving integrated integration module disclosed by the invention is easy to integrate, can be expanded, and can meet the requirements of large-scale MIMO radio frequency multi-channel transceiving.

The invention provides an auto-disturbance-rejection iterative learning-based multi-motor synchronous control method, which comprises the steps of building a mathematical model of a multi-motor system and initializing a system state and a control parameter; designing a multi-motor speed tracking controller on the basis of an iterative learning method; and designing an iterative expansion state observer by combining an auto-disturbance-rejection control strategy, and effectively estimating an unknown term in the system and compensating the unknown term through repeated iteration. An improved adjacent coupling strategy is provided to design multi-motor synchronous control. The problem of the speed consistency of the multi-motor system can be effectively solved; the fast convergence performance and the tracking accuracy of the system are improved; and the robustness of the multi-motor system is strengthened.

Synchronous bus controller issues synchronizing information real time to work head motion control card, mask platform motion control card, and alignment motion control card through synchro data bus, said motion control card receiving synchronous bus controller interval synchronous signal and state synchronous signal and respectively synthesizing into optical fiber triggering signal and status signal, then sending to underlayer I / O control panel, alignment control system and leveling focusing control system. The present invention realizes real-time data communication and synchronization control among plurality of control units in step scan projection photoetching machine.

The invention discloses a music synchronous playing method and system based on a WIFI (Wireless Fidelity) protocol. The music synchronous playing method comprises the following steps: acquiring a Beacon data packet carrying a synchronization timestamp transmitted by a wireless access point through master and slave audio equipment; extracting the synchronization timestamp from the received Beacon data packet, and synchronizing local clocks of the master and slave audio equipment into a lock of the synchronization timestamp; acquiring audio data through the master audio equipment, and adding playing timestamps to headers of each frame of audio data; and transmitting the audio data and the playing timestamps to the slave audio equipment, so that the master and slave audio equipment plays music at the playing timestamps. Through adoption of the music synchronous playing method and system, time synchronization of a multi-room system is realized, and a very good effect is achieved by means of an underlying protocol of a WIFI network through the timestamp in the Beacon data packet without increasing the network load or using a WIFI network clock synchronization protocol 802.11V.

The present invention discloses a networked multi-axis motor synchronization control device and method. The device comprises a pulse collection module, a controller module, a synchronization serial difference bus, a multi-axis module, a servo motor drive module and a man-machine interaction module. The method comprises: the pulse collection module collects pulse signals outputted by a host command motor, the pulse signals are subjected to optoelectronic isolation processing and then are sent to the controller module, the controller module performs periodic sampling count of the received pulse signals, the pulse count is sent to the multi-axis module through the synchronization serial difference bus, and the multi-axis generates PWM control signals through the current data frame and the feedback pulse signals of a slave motor. The networked multi-axis motor synchronization control device and method is simple in structure and can realize the high-precision synchronization control of the multi-motor through the network and the remote monitoring of the field data.

The invention discloses a multi-camera synchronous control device base on a GPS and a pulse generator as well as a multi-camera synchronous control method. The multi-camera synchronous control device comprises a GPS receiver, the pulse generator, a plurality of camera units, a plurality of high-speed image collectors and a plurality of image collecting and processing computers. As an external triggering source model of high-speed cameras is adopted by the multi-camera synchronous control device, based on the GPS time service, the device guarantees the time synchronization according to the synchronous pulse per second emitted by a satellite at the initiative moment of each second to realize the synchronous control on multiple cameras. The multi-camera synchronous control device is high in synchronization precision and reliability, simple and practical.

The invention discloses a method for controlling silicon single crystal growth temperature on the basis of finite element numerical simulation. The method comprises the following steps: firstly, finite element modeling is performed by referring to crystal shape, and reference shape and boundary conditions of crystals in the whole process are set; the optimal trajectories, meeting constraints, of crystal temperature and heater power are calculated in an offline optimized manner with an optimization method by adopting the highest crystal cooling speed as the target and adopting adjustable rangeof the heater power and the maximum temperature gradient in the crystals as constraint conditions, and the optimal trajectories are used as reference input of a control system; then, crystal radius iscontrolled; finally, tracking control is performed on temperature trajectory in the crystals. The problem of crystal dislocation defect caused by the fact that crystal temperature control cannot be realized with the silicon single crystal growth control method in the prior art is solved.

The invention provides an artificially assembled and disassembled automatic guided vehicle control system which comprises a battery, a control module, a motor controller, a first motor, a second motor, a signal processor and a mechanical device, wherein the control module sends a control signal to the motor controller, and the motor controller respectively controls the operation of the first motor and the second motor so as to drive the mechanical device to move; and the drive signal of the first motor and the second motor is synthesized by the signal processor to control the movement of the mechanical device. The control module is a dual-core controller which comprises an upper computer system and a movement control system arranged on an ADSP (Advanced Signal Processing) circuit and an FPGA (Field Programmable Gate Array) circuit, and the upper computer system comprises a human-computer interface, a path planning module and an online output module; the movement control system comprises an encoder module, an input and output control module, a data memory module and a servo control system, wherein the servo control module is realized by the FPGA circuit and other modules are realized by the ADSP circuit.

The invention relates to the field of metal rolling, in particular to a numerical control roll machine. The numerical control roll machine comprises machine bodies including the upper machine body and the lower machine body, and further comprises a servo main shaft driving system, a proportional servo hydraulic sliding base feeding system and a numerical control system. The servo main shaft driving system, the proportional servo hydraulic sliding base feeding system, the numerical control system and the upper machine body are all fixed to the lower machine body, machine body side walls are arranged at the two ends of the upper machine body respectively, and the machine body side walls and the upper machine body are of an integrated structure. According to the numerical control roll machine, high-precision synchronous rotation of double main shafts is achieved, completely independent control over the two main shafts is achieved, automatic tooth position alignment can be achieved, and machining precision of the machine is improved.

The invention discloses an adjacent coupling type multi-motor speed tracking and synchronous control method based on a fuzzy disturbance self-resistance and self-adaptive sliding mode, comprising steps of establishing a mathematic model of a multi-motor system, initializing a system state and a control parameter; designing a multi-motor speed tracking controller based on the fuzzy disturbance self-resistance method; and designing a multi-motor synchronization controller based on the improved adjacent coupling and the self-adaptive sliding mode. The adjacent coupling type multi-motor speed tracking and synchronization control method based on the fuzzy disturbance self-resistance and self-adaptive sliding mode can effectively solve the consistency problem of the motor system, improves the fast convergence performance of the system and enhances the robustness of the motor system.

The invention provides a multi-channel synchronization method applied to a phased-array radar. The method comprises the steps of base band data synchronization and digital local oscillator synchronization, wherein the base band data synchronization comprises the steps that a trigger signal is received by FPGA to generate a distributing trigger signal, a sampling clock signal is used for collectingthe distributing trigger signal, a synchronous trigger signal is used for completing the collecting and generating of the signal, the digital local oscillator synchronization comprises the steps thata primary module generates an NCO synchronous trigger signal, after the rising edge of a public signal is collected by a reference clock signal, a trigger signal is generated, NCO is synchronously restored by the module to complete the synchronization of the NCO, and therefore the synchronization of a digital oscillator signal is completed. The method has the advantages that the signal generatingand sampling of a high-speed digital member and the synchronous control of digital variable frequencies are achieved to ensure the synchronous operation of a multi-channel digital system of the phased-array radar, multi-channel synchronization of antenna arrays of an active electronically scanned array and digital array radar is achieved, and the demands of beam pointing, efficient spatial powersynchronization and multi-channel transceiving synchronization of a radar system are met.

The invention discloses a guaranteed performance robust decentralized control of a dual-motor servo system, and can realize system load tracking and motor synchronization under the influence of a loadinter-load coupling factor, specific to a tooth space interconnecting item-containing dual-motor servo system. The guaranteed performance robust decentralized control comprises the following steps ofperforming analysis on the tooth space-containing dual-motor servo system, and establishing a state space expression of the dual-motor servo system by adopting a tooth space dead zone model. Specificto the dual-motor servo system, when the unknown nonlinearity of the load end satisfies a Lipschitz condition, the optimal state feedback is designed by a linear secondary type tracker; by combination with a robust controller, a guaranteed performance-based robust decentralized tracking controller is configured by combination with the robust controller. When it is supposed that the unknown nonlinearity of the respective motors is consistent, the optimal integral sliding mode controller is designed so as to realize synchronization between two motors; and by combination of the guaranteed performance-based robust decentralized tracking controller and the optimal integral sliding mode controller of the motor, the actual controller of each motor is configured in order to perform motor synchronous control.

The invention provides a refrigeration and freezing device and a compartment partition assembly thereof. The compartment partition assembly comprises a partition used for partitioning a storage compartment of the refrigeration and freezing device, and provided with a first air port and a second air port in the front part and the rear part separately, a first air door and a second air door which are installed in the partition, and used for adjusting the open areas of the first air port and the second air port separately, and an air door drive mechanism configured to drive the first air door and the second air door to synchronously act, so that the open areas of the first air port and the second air port are synchronously increased or synchronously reduced. The refrigeration and freezing device comprises the storage compartment and the compartment partition assembly, wherein the compartment partition assembly is installed in the storage compartment and used for partitioning the storage compartment into a first sub-compartment and a second sub-compartment; and the refrigeration and freezing device is configured to enable cold air to enter the second sub-compartment through the second air port, complete heat exchange with a stored object in the second sub-compartment, and then flows to the first sub-compartment through the first air port, so that the refrigeration temperature of the second sub-compartment is adjusted through changing the open areas of the first air port and the second air port.

The invention discloses an on-off control method for an electric braking air compressor system by improving a combined dryer, and belongs to the technical field of brake control of full electric vehicles. The on-off method is characterized in that an air pressure signal capable of reflecting a working state of the dryer is guided out to actuate a pressure switch by improving an air path structure inside a conventional combined dryer to control on and off of an electric braking air compressor by utilizing a pressure switch signal, so that synchronous control on on-off of the air compressor and unloading and purging actions of the dryer is realized, and therefore, the electric energy is saved, the working performance and the service life of the dryer are effectively guaranteed. In principle, the method realizes synchronization of the on-off of the electric braking air compressor and the unloading and purging actions of the dryer, has the advantages of being simple in structure, easy to implement, low in cost, reliable in performance and the like, and is especially suitable for various pure electric commercial vehicles and range-increasing type commercial vehicles, which adopt an air-pressure brake mode; and the method has an important engineering application value on improving and enhancing the reliability and the service life of an air pressure brake system.

The invention discloses a thermit reaction temperature and combustion rate experimental measurement device and method and belongs to the technical field of energetic material performance testing. According to the thermit reaction temperature and combustion rate experimental measurement device, a high-temperature reaction mechanism comprises a protective pipe, a combustion tank and a tension bar, both ends of the protective pipe are provided with sealing plugs, the combustion tank is arranged inside the protective pipe, one end of the tension bar is detachably connected with the end portion of the combustion tank, and the other end of the tension bar penetrates one of the sealing plugs and extends out of the protective pipe; a gas supply mechanism is used for providing gas for thermit reaction of the high-temperature reaction mechanism; an ignition mechanism is used for igniting thermit reaction powder inside the high-temperature reaction mechanism; a combustion data collecting mechanism is used for collecting experimental data. The thermit reaction temperature and combustion rate experimental measurement device can achieve full-process monitoring of thermit reaction temperature and combustion rate change, meanwhile achieve the functions of combustion state visualization, experimental operation synchronous control and data collection and treatment integration and improve the accuracy and reliability of experimental results.

The invention provides a photographing control method and system based on an external flash light source and a storage medium. The method comprises the following steps: 1, preparing a precursor; the first processing assembly controls the working states of the built-in flash light source and the image acquisition assembly according to a preset target brightness parameter; obtaining the light stateinformation of the built-in flash light source and the shooting state information of the image acquisition assembly in the corresponding working state, and generating an external light supplement starting trigger signal according to the light state information and the shooting state information; wherein the external light supplementing starting trigger signal comprises starting light supplementingtime; the signal sending assembly sends an external light supplement starting trigger signal to the external flash light source, so that the external flash light source starts illumination light supplement work at the light supplement starting time according to the external light supplement starting trigger signal; and the image acquisition assembly starts shooting work after the flash illumination assembly starts illumination light supplement work. On the premise that software and hardware of equipment are not changed, the external flash light source is synchronously controlled to perform illumination light supplement during exposure, and the photographing quality is improved.

The invention belongs to the technical field of laser power monitoring and discloses a laser power monitoring system and a monitoring method. The laser power monitoring system comprises a laser emission module, a power detection module, an operation module, a central control module, a power control module, a power correction module, a data storage module and a display module. The invention can obtain laser pulses whose laser power varies with the input quantity of the analog input signal through the power control module. Compared with the prior laser pulse power control, the control interfaceis simpler, the control efficiency is higher, and the synchronous control of the laser pulse power can be realized. At that same time, a control current is obtain according to the pow correction module. Laser power curve, the relationship between control current and laser power can be obtained, so that the laser power can be obtained by detecting the control current, and the laser power can be corrected more accurately without adding additional power detection equipment.

The invention discloses a bed net and an application method thereof. The bed net comprises a gear motor, two sides of the gear motor are both provided with rhombic stretchable frames and racks, the racks comprise sawtooth parts and non-sawtooth parts, the gear motor is meshed with the sawtooth parts of the racks, the rhombic stretchable frames comprise first foldable rods and second foldable rods, the tail ends of the first foldable rods are connected with the non-sawtooth parts of the racks, the tail ends of the second foldable rods are movably connected with the cross rods of the bed net, side rods are arranged to be vertical to the cross rods of the bed net, multiple connecting nodes of the first foldable rods and the second foldable rods are connected to sliding rails on the side rods through corresponding sliding blocks, the side rods can move along sliding grooves in the cross rods, and the bed net is connected to the rhombic stretchable frames. According to the bed net, the motor is used for synchronously controlling two stretchable frames, the bed net can be automatically unfolded and withdrawn, human operation is not required, the problem that mosquitoes enter when a traditional bed net drops down is solved, the mosquitoes are effectively prevented from staying on the bed net, and person can be prevented from being bitten when falling asleep.

The invention discloses a stage control system realizing independent operation and coordinated operation of multiple units. The system comprises a cloud server, a master control unit, a slave control unit and a stage safety monitoring sub system. The system provided by the invention realizes concentrated monitoring, unified management and synchronous control of multiple systems of a stage, improves the stage performance effect and the work efficiency and realizes self safety protection of stage operation.

The invention discloses a precise cutting control system for an offshore oil platform, and is on the basis of a structural type of a PC (Personal Computer) and a DSP (Digital Signal Processor) motion control card group. The precise cutting control system for the offshore oil platform mainly comprises a control module for processing processes in the PC, a topological structure setting module, a processing code loading module, a processing parameter setting module, a DSP motion control card internal-communication explanation module, a state and error management module, a parameter managing module, a coordinate system defining module, a cache region management module, a motion control module, a coding module, an interpolation module, a micro interpolation module, an error compensating module, an individual module, and a pulse and error synchronous control module. According to the precise cutting control system for the offshore oil platform, the synchronous control under a condition of multiple shafts, multiple coordinate systems and multi-motion control card conditions can be achieved according to the characteristics of an offshore oil platform steel structure; the topological structure of the control system can be quickly reconstructed according to the mechanical topological configuration, and a processing code can be recycled; and errors of clamping and shape of a workpiece can be corrected, so that the precision on positioning can be ensured, and the requirement on the high dimensional precision ratio can be met.

The present invention discloses a multifunctional electronic pointer. The multifunctional electronic pointer comprises a control handle and a front rod. The multifunctional electronic pointer is characterized in that: the control handle is mainly composed of a processing module and an operation module which are matchingly used; the processing module includes a USB interface, a signal transceiver I, a flash memory driver and a processor; the operation module includes a signal transceiver II and an operation button; the processing module and the operation module are in wireless signal transmission through the signal transceiver I and the signal transceiver II; and the system control with remote control is loaded into the flash memory driver of the processing module in advance, and when the USB interface is connected with a near-end device, the near-end device automatically loads the system control with the remote control. The structure is simple, the design is scientific, and the efficiency of the classroom is improved.

The invention discloses a synchronous control method of a remote high-resolution display system. The synchronous control method includes the following steps of transmitting images of an image part area in the display system by a service side according to image pickup requests of a client side; transmitting images of a control part area in the display system to a display interface of the client side by the service side; operating the corresponding position of the image of the control part area on the display interface by the client side by means of a mouse of the client side; and driving a mouse of the service side to complete operation according to motion events received by the service side, transmitting the images of the control part area to the client side after operation is completed, and displaying on the display interface of the client side so as to substitute the images of the control part area before operation is completed. The synchronous control method of the remote high-resolution display system can realize synchronous operation and control of operation components such as a menu and a tool bar on remote high-resolution displaying equipment.

The invention discloses an MAS-based distributed coordinated control method for virtual power supplies in a low-voltage micro-grid. The distributed coordinated control method comprises primary controland secondary control, wherein the primary control is used on the basis of coordination of virtual impedance and virtual power supplies, line impedance characteristics are improved through selectinga proper virtual impedance value, output voltage of various virtual power supplies between micro-sources is roughly the same, and reactive power equalization of the micro-sources is improved to a certain extent; and secondary control is based on a consistency protocol, interaction of voltage information of various virtual power supplies between the micro-sources is carried out through a sparse communication network of the micro-grid, and voltage of various virtual power supplies is coordinated to be strictly consistent. The interaction between the micro-sources is based on a built MAS, the primary control is executed by various micro-sources at the bottom layer as primary agents and the secondary control is executed by an upper coordination part as a secondary agent. According to the method, a control target can be provided with double guarantees through a two-layer control system, and meanwhile, voltage evaluation indexes for the virtual power supplies are determined to coordinate operation between the primary control and the secondary control.

The invention relates to a whole cam automatic lathe which belongs to machining equipment and solves the defects of high cost, complex operation, large energy consumption, high requirements on the quality of workers and the like existing in the prior art. The whole cam automatic lathe comprises a lathe bed, a workpiece clamping and moving device and a tool installation and moving device, and is characterized in that: the workpiece clamping and moving device is connected with a workpiece linkage mechanism group used for providing a plurality of linear reciprocating motion or swing; the tool installation and moving device is connected with a tool linkage mechanism group used for providing a plurality of linear reciprocating motion or swing; all the linkage mechanisms of the workpiece clamping and moving device and the tool installation and moving device are driven by a cam mechanism; and the lathe bed is provided with a fixed link which is taken as a fixed point of all the linkage mechanisms. A control component is formed by a cam and the linkage mechanisms, thus forming a mechanical full automatic bearing ring lathe which can reduce the manufacturing cost and the use cost, and has simple operation and low requirements on the quality of workers.

The invention relates to a single-valve core and double-channel solenoid valve, solving the technical problem that the two channels of the existing solenoid valve can not be easily or synchronously opened and closed, the structure is relatively complex and the weight is heavier. The single-valve core and double-channel solenoid valve comprises a valve body, a valve core and a coil, wherein, the valve core is matched with the valve body for guiding, the valve core generates electromagnetic attraction under the action of the magnetic field of the coil, an axially installed cylindrical spring is arranged between the valve core and the valve body, and a first channel and a second channel which are mutually independent are arranged on the valve body, and the first channel is sealed after a first valve seat is matched with the valve core; the second channel is sealed after a second valve seat is matched with the valve core; and the sealing between the first valve seat and the valve core as well as between the second valve seat and the valve core adopts a combined type soft-hard sealing structure. The invention has the advantages of rapid response, light weight, small volume and good consistency of the action.