4results about How to "Synchronization speed is fast" patented technology

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 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 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.