30results about How to "Guaranteed Time Synchronization" patented technology

The invention relates to a device and method for analysis and test of a high-speed grinding characteristic of a rotary part. The device mainly comprises a high-speed grinding wheel spindle system, a workpiece spindle system, a force measurement device for testing cylindrical grinding force, a cylindrical grinding workpiece and a temperature test device of the cylindrical grinding workpiece, and the device is used for analyzing and researching grinding force, grinding heat, a computing method of a coupling effect and a software system. Simultaneously, the grinding force and the grinding heat in a high-speed grinding process of the rotary part are collected so as to discriminate effect of mechanical energy and heat energy in the high-speed grinding process on workpiece surface quality and grinding wheel wear mechanism, and testing accuracy and efficiency of the grinding force of the rotary part are improved greatly. By means of a reverse heat flux calculation method and an algorithm, heat flux entering the workpiece, the grinding wheel and the like is obtained, effect of a high-speed grinding process on the workpiece surface quality and the grinding wheel wear mechanism is disclosed, grinding process parameters and the like are optimized further, high-speed grinding characteristics of different workpiece materials can be disclosed, and further optimization design of the high-speed grinding process and main configuration of the process is performed.

The invention discloses a locomotive comprehensive information recording device and a recording method. The device comprises a main recording module, wherein the main recording module comprises a main processor unit, a main network interface unit, a main storage unit and a main power supply unit; the main network interface unit comprises a plurality of bus interfaces which are connected with a locomotive bus; the main processor unit is respectively connected with the main network interface unit and the main storage unit; information acquired by the main network interface unit is coded in a unified manner and is stored in the main storage unit; and the main power supply unit respectively supplies power for the main processor unit, the network interface unit and the main storage unit. The device has the advantages that synchronization of time of various locomotive-mounted information devices can be guaranteed effectively, the information of the various locomotive-mounted information devices on a locomotive can be coded, stored and managed in a unified manner, data integrated level is high, integrity is good, users can use the information conveniently, the information is fused and analyzed comprehensively, the utilization value of the information is increased effectively and the like.

The invention discloses a time synchronization algorithm based on a loosely coupled IMU array navigation system. An error model of an IMU array navigation system is established, a system equation containing a time synchronization error is established based on the model, and a time synchronization error as a state variable is introduced into a state space model to serve as a state estimation amount; with a fractional delay filter, time displacement is performed on the time synchronization error, interpolation is performed on amplitude and phase responses of the fractional delay filter by usingthe Lagrange's interpolation to obtain displacement of the inertial sensor data so as to ensure time synchronization of the inertial sensor; and carrying out error compensation on the delayed inertialsensor data, inputting the inertial sensor data after time displacement and error compensation into a navigation equation of the inertial navigation system, and carrying out navigation calculation toobtain actual navigation parameters. According to the disclosed method, no extra hardware is needed; and the computation load of the navigation system is reduced.

The invention discloses a synchronous data acquisition method based on a wireless sensor network, which mainly solves the problems of detection error, positioning error caused and the like by GPS (Global Positioning System) timing error. In the method disclosed by the invention, PPS(Pulses Per Second) and GPS timing information are harmonized to be synchronous for three times so as to reach time synchronization of all the sensing nodes; a peak window method is adopted to judge the PPS State legitimacy so as to ensure time synchronization; a high-speed clock is used to maintain a local time scale so as to decide whether to amend the current time scale in real time; and automatic updates are conducted each 40 seconds. If the acquisition time point required by an FPGA(Field Programmable Gate Array)analytical management center is ahead of the current time scale, a time overflow error is reported to inform the management center to give a command again; if the acquisition time point required by the FPGA analytical management center is behind the current time scale, a receiver is turned off at time of one second before the next acquisition time point; the receiver is turned on to acquire the data at the time point required by the management center. With the method disclosed by the invention, the accuracy and the robustness of GPS timing of the sensing nodes of the wireless sensor network are improved. The method is applicable in collaborative signal detection and positioning data acquisition of the nodes of the wireless sensor network and the like.

The invention discloses a method and a system for improving the SOC calculation precision of an electric vehicle power battery. According to the invention, the method comprises the steps of acquiring the voltage of each battery, determining a limit monomer battery, measuring the limit voltage, calling the current of the corresponding time, recognizing model parameters to obtain an open-circuit voltage, predicting a stable open-circuit voltage after standing for a period of time, obtaining an SOCnew according to the SOCSnew-OCV relationship, and updating the SOCnew in the ampere-hour integral method. according to the invention, the open-circuit voltage method, the model method, the ampere-hour integral method and the prediction are combined. The SOCnew in the ampere-hour integral method is continuously updated, namely the initial SOC. Therefore, the accumulative error is reduced.

The invention discloses a dynamic compensation pulse circuit which comprises a signal generation module for generating a primary second pulse signal, a standard signal module for receiving a standardsecond pulse signal and capturing a rising edge time point of the standard second pulse signal; a processor for generating an updating storage value according to the rising edge time point of the standard second pulse signal; a signal adjusting module which is connected with the signal generating module and the processor and is used for receiving the updating storage value; wherein the signal adjusting module is started by the primary second pulse signal, and transmits the updating storage value to the signal generation module; and the signal generation module generates an update second pulsesignal according to the updating storage value. The method has the advantages and beneficial effects that the influence of channel transmission delay on time synchronization clock precision is eliminated, and the clock synchronization of the dynamic compensation pulse circuit and the standard time source is realized. The clock synchronization between the standard time source and the synchronized device is guaranteed, the structure is simple, and the cost is low.

The invention discloses a synchronous playback method. When receiving a synchronous playback request message from a receiver, a server sends the synchronous playback request message to specific sender; a specific field in the synchronous playback request message includes identifiers of front-end devices which need synchronous playback, and the specific sender stores video monitoring data of the front-end devices, so that the server establishes a session between the receiver and the specific sender via session configuration information of the sender, and then the receiver can receive the video monitoring data corresponding to the front-end devices synchronously via the session; and thus, required preparation time for synchronous playback of the front-end devices is reduced, and it is ensured that videos are played back synchronously.

The invention discloses a time calibration system and method, electronic equipment and a storage medium. The method comprises the following steps: acquiring a digital signal and attitude data, wherein the attitude data is obtained according to an inertial sensor in a turntable unit; analyzing the digital signal to determine the emission time of the laser signal corresponding to the digital signal; reading a target angular velocity corresponding to the emission time from the emission time; and calculating a time error between an output moment corresponding to the attitude data and an emission time corresponding to the laser signal based on the target moment and the target angular velocity, and carrying out time calibration according to the time error. According to the embodiment of the invention, the time error between the output time corresponding to the attitude data and the emission time corresponding to the laser signal is calculated according to the attitude data and the digital signal converted from the laser signal, and the time of the system can be subsequently calibrated by using the time error, so that the jitter error generated in each link is effectively avoided, and the calibration accuracy is improved. And time synchronization of the laser signal and the attitude data is ensured.

The invention relates to a small inertia self-rotation-eliminating control method and system for a spatial remote-sensing scanning imaging system. The method comprises: step one, planning a motion curve of a rotation eliminating system; step two, optimizing a rotation inertia of the rotation eliminating system; step three, setting a time aligner and acquiring a rotation eliminating system angularposition theta <*>e at a same time of a scanning imaging system; step four, setting an error compensator output Tse; and step five, planning a motion curve of the rotation eliminating system by usingrotation eliminating system rotation inertia minimization as an objective, introducing error compensation Tse by using the rotation eliminating system angular position theta <*>e calibrated by the time aligner as a control input, and carrying out rotation eliminating controlling on the scanning imaging system. Therefore, the rotation inertia of the rotation eliminating system is minimized while the index requirement is met. When the rotation inertia of the rotation eliminating system is reduced, the motion characteristics change subsequently; on the basis of implementability of the mechanism design, the motion characteristics and the rotation inertia of the rotation eliminating system are optimized, so that the interference torque of the scanning imaging system is cancelled by the small inertia rotation eliminating system.

The invention discloses a power Internet of Things wireless sensor time synchronization system and method. The system comprises a root wireless sensor, at least two secondary root wireless sensors and a plurality of wireless sensors; the secondary root wireless sensors are used for sending a grouping starting message to the plurality of wireless sensors, the plurality of wireless sensors are grouped according to the grouping starting message, and each group of wireless sensors respectively correspond to each secondary root wireless sensor; the root wireless sensor is used for sending a synchronous broadcast signal to the secondary root wireless sensors, and the secondary root wireless sensors are used for recording the arrival time of the synchronous broadcast signal according to the local time of the secondary root wireless sensor and sending the arrival time to other secondary root wireless sensors; each secondary root wireless sensor adjusts the clock of the secondary root wireless sensor according to the received arrival time; each group of wireless sensors is used for carrying out bidirectional message exchange with the corresponding secondary root wireless sensor so as to realize time synchronization; and according to the method, the synchronization precision and the algorithm power consumption can be well balanced.

A method for operating a digital interface arrangement and a digital interface arrangement for exchanging data between at least one digital control unit operating in the baseband of a communication terminal and at least one radio transmitter/radio receiver device of said communication terminal. The baseband control unit is connected to a first number of data paths that can be used in parallel for exchanging data via a first interface device while each radio transmitter/radio receiver device is connected to at least some of the data paths that can be used in parallel for exchanging data via one respective second interface device. If at least two groups are provided, the first interface device and second interface device transmit data in a substantially simultaneous manner on the data paths contained in said groups by means of a multiplexing method.

The invention discloses an automatic test method for a modular electromechanical integrated management system. The method is used for an electromechanical system of a large aircraft and comprises thefollowing steps that: test equipment is in automatic test connection with a tested object, wherein an instruction protocol format of the automatic test connection is set to be a start bit, a check bit, a version, a timestamp, a type, a length and data; the test equipment automatically tests the tested object, and in the automatic test process, the test equipment and the tested object realize longconnection and synchronization and keep an expected action consistent with a tested action; and time synchronization operation is performed in an automatic test execution process. The invention provides an automatic test method for an electromechanical system, which is characterized in that automatic test linking, automatic execution and automatic time synchronization are realized, the time synchronism of a test process and an automatic comparison mechanism of test expectation and results are ensured, the test workload is reduced, and the test quality is improved.

The invention provides a business data processing method, a client, a server and a system, and the method comprises the steps that when a user starts to use a charging service of the client, the client obtains a current timestamp, a service number and a reporting interval second number from the server; the client uploads a section of business data to the server every other reporting interval second until the user ends the charging service, and the business data at least comprises a service order number, a time sequence, a business data number and an end identifier; and the server deduplicates all the time sequences, determines the total time length of using the payment service by the user based on the deduplicated time sequences, and determines the total time length of using the charging service by the user. In the scheme, the client acquires the current timestamp from the server before timing, and the server determines the total time length of using the payment service by the user based on the deduplicated time sequence after deduplicating all the received time sequences, so that the time synchronization of the client and the server is ensured, and the charging accuracy of the server is improved.