11results about How to "Synchronization speed is fast" patented technology

The invention discloses an inverter parallel single bus active carrier phase synchronization method. A host sends a carrier synchronization signal to a slave through a synchronization signal line at a carrier counting zero point; the slave reads numerical values in the basic calibration register, the time deviation register and the period register while receiving the carrier synchronization signal, and calculates a deviation value delta psi of carrier phases of the current slave and the host; and compensating the period deviation in the period register through the deviation value delta psi, so that the carrier counting zero point of the slave is aligned with the carrier counting zero point of the host. An existing hardware system does not need to be expanded, extra hardware cost is not increased, and the hardware size is not expanded. And the carrier wave difference of different master and slave controllers can be dynamically compensated according to an established parallel operation system. The carrier synchronization of the host and the slave is realized in a carrier phase deviation period, the synchronization speed is high, the precision is high, the synchronization can be locked after synchronization, and the condition of carrier synchronization failure in the operation process is avoided. And the stability is excellent.

The invention discloses a rotor wing shielding fading self-adaptive tracking method and device for helicopter satellite communication. The method specifically comprises the following steps: establishing a rotor shielding mathematical model of helicopter satellite communication, acquiring a signal after rotor shielding fading detected by a helicopter airborne communication terminal, and adding anti-noise filtering to improve a detection signal-to-noise ratio; a rotor shielding waveform is generated according to the measured rotor shielding fading parameters, coarse synchronization of the generated waveform and the detected waveform is carried out, and the system synchronization speed is increased; comparing a parameter error between the rotor shielding waveform generated by the local periodic pulse generator and the measured rotor shielding waveform to obtain an error detection result; and correcting the period, the phase and the width of a rotor shielding waveform generated by a local periodic pulse generator by using an error detection result, so that the rotor shielding waveform can adaptively track the change of rotor shielding. According to the invention, changes of shielding fading depth and shielding time of the helicopter rotor can be adaptively tracked, and the stability of satellite communication of the helicopter is improved.

The invention discloses a database synchronization method, and belongs to the technical field of database synchronization. The problems that an existing database synchronization scheme is low in synchronization speed and poor in real-time performance and stability under the condition of large data volume are solved, successful connection between the source database and the target database can be ensured by configuring the source database, meanwhile, the security of the source database and the target database can be ensured through security configuration, and the security of the source database and the target database is ensured. According to the partition synchronization scheme, the source database can be partitioned, a synchronization rule is configured for the partitions, and the data of different partitions are processed by the partitions corresponding to the target database, so that large-scale data can be processed under the condition of large data volume, the synchronization speed is increased, the database synchronization state is continuously monitored, and the data synchronization efficiency is improved. According to the method and the system, the database synchronization efficiency and accuracy can be ensured, and the synchronization result is verified after the synchronization is completed, so that all data is correctly synchronized to the target database.

The application relates to a CAD drawing sharing and discussing system, which comprises a first terminal, one or more second terminals, a first CAD drawing sharing module and a first instant messaging module in the first terminal, a second CAD drawing sharing module and a second instant messaging module in each of the one or more second terminals, the first CAD drawing sharing module and the second CAD drawing sharing module transmitting and sharing CAD drawings with each other, and the first instant messaging module and the second instant messaging module transmitting instant messaging information with each other. In the application, each terminal can look at the CAD drawing while instant messaging, so that each party of CAD cooperation can view the CAD drawing at any time during the communication and discussion, which is convenient and fast.

The present invention discloses a lightweight cross-platform storage migration method, device and medium based on NETCore, including: after receiving the start signal, the start end triggers the verification signal and performs the connection test; wherein, the trigger verification signal is used for the start end to perform the verification process according to the information filled in by the user in the preset file; the connection end performs the synchronization preparation operation and the progress feedback operation according to the user's selected reading mode information; after receiving the notification signal of the connection end completing the file loading, the synchronization end generates a file synchronization result signal. Its beneficial effect is that it is no longer limited to the types and manufacturers of both the file source and the file target storage, even if it is a binary file stored in the database, the local network address provided by Nfs can be read and uploaded.

The present application relates to finite time reduced dimension observer design method and chaotic communication system, belong to information security and chaotic communication field. In view of the defects of traditional asymptotic observer slow, time is uncontrollable, sliding mode method exists chattering and message signal pollution output is difficult to construct observer, the present application establishes the chaotic drive system containing message signal embedding, constructs the equivalent system without unknown signal, designs finite time reduced dimension observer based on observer matching condition and strong observable condition. Compared with the traditional asymptotic convergence observer method, the present application can realize the complete synchronization of chaotic system within the user preset time, adopts continuous control law without chattering, and the message signal can be accurately recovered through algebraic formula. The synchronization time of the present application is controllable, the convergence speed is fast, the recovery precision is high, and the robustness is strong, which is suitable for various chaotic secure communication scenes, effectively improves the communication real-time, security and engineering practicability.

This invention discloses a group train tracking operation optimization method considering communication delay, comprising the following steps: establishing a heavy-haul railway train group with a "leader-follower" topology; constructing a multi-objective optimization model based on vehicle characteristic constraints, speed limits, and safety distance constraints; generating random communication delays in the model, calculating the time steps corresponding to the delays, and having the following train make control decisions based on the state information of the preceding train at the previous time step; and solving for the running speed of the following train in the multi-objective optimization model using a particle swarm optimization algorithm. This group train tracking operation optimization method effectively solves the problems of uncertainty and dynamic response lag caused by communication delays during the tracking operation of heavy-haul railway train groups. It can not only significantly reduce tracking errors between trains and improve speed synchronization, but also effectively reduce distance fluctuations during acceleration and deceleration phases, ensuring stable train spacing.

The invention belongs to the field of data transmission, and particularly relates to a data transmission method, system and device of a named data network and a storage medium, and the method comprises the following steps: establishing communication between a current node and a neighbor node to obtain a network state of the neighbor node, registering a name prefix of the neighbor node in an active state, generating an adjacent link state announcement and a name link state announcement, then performing data exchange with a neighbor node to obtain data of the neighbor node, storing the data into a network link state database, obtaining a routing forwarding table according to the network link state database of the current node, and forwarding the routing forwarding table to the current node; and determining a data cache node and a target node for transmitting data according to the routing forwarding table. The method has the advantages of being high in state data synchronization speed, small in state data transmission amount, high in routing calculation speed and small in routing calculation overhead.

The invention provides a finite time fractional order delay coupling competitive neural network synchronous learning method, and belongs to the technical field of iterative learning control. The technical problems that a fractional-order time-delay coupling competitive neural network is difficult to realize complete synchronization on a time axis and the structural design of a controller is complicated are solved. According to the technical scheme, the method comprises the following steps: S1, establishing a single competitive neural network model with time delay; s2, matrix lifting is carried out on the data, and the data are written into a compact form; s3, considering a coupling competitive neural network formed by a plurality of time-delay competitive neural networks, and describing communication topology between the networks by means of a graph theory; s4, designing an input sharing fractional order quantitative learning control protocol, and writing the input sharing fractional order quantitative learning control protocol into a matrix form; and S5, carrying out convergence proving on the designed control protocol. The beneficial effects of the invention are that the synchronization speed of the fractional-order time-delay coupling competitive neural network is obviously improved through the input shared control cooperation.

The invention relates to a hybrid transmission synchronizer protection control method and device and a medium. The method comprises the following steps: executing a synchronizer protection function action after a synchronizer protection function activation condition is met, and stopping executing the synchronizer protection function action after a synchronizer protection function exit condition is met; the protection function activation condition of the synchronizer is as follows: the hybrid mode is series connection; gear conditions are met; no fault related to action execution exists; the synchronizer protection function exit conditions are as follows: the hybrid mode is pure electric or parallel; the target gear is an N gear or the actual gear is a non-N gear; the function action is executed; a fault related to action execution exists; the gear available range is widened, when a gear engaging command is detected and a large speed difference exists at the two ends of the synchronizer, the design action is executed, the speed difference at the two ends of the synchronizer is effectively reduced, and when the gear engaging action is executed, abrasion to the synchronizer in the synchronizing process is reduced, the synchronizing speed is increased, and synchronizing impact is reduced.

The utility model provides a high-precision hobbing workpiece main shaft structure, which relates to the technical field of machine tool precision main shaft manufacturing and comprises a shaft core, a front bearing assembly, a torque motor, a rear bearing assembly and a circular grating encoder. The front bearing assembly is composed of a front end cover, a front angular contact ball bearing, a front bearing seat and a front locking nut and arranged at the front end of the shaft core in a sleeving mode. The rear bearing assembly consists of a rear bearing seat, a rear angular contact ball bearing, a rear locking nut and an encoder mounting cover, and is sleeved at the rear end of the shaft core; the torque motor is composed of a torque motor stator and a torque motor rotor. The torque motor is arranged in the middle of the shaft core in a sleeving mode. According to the scheme, a coupler is omitted, a built-in motor direct drive scheme is adopted, and the transmission precision and the response speed are improved; according to the scheme, the torque permanent magnet motor is adopted for driving, the circular grating absolute value encoder is used for replacing a traditional servo motor and gear encoder scheme, the positioning precision of the main shaft is higher, the speed stability is higher, and the speed synchronism is also higher.