Classifications

• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
  • G05B17/00—Systems involving the use of models or simulators of said systems
  • G05B17/02—Systems involving the use of models or simulators of said systems electric

Definitions

• the invention relates to automation, computer engineering, information transfer systems and can be used for computer networks of distributed control of high-speed cycles of applied processes in real time.
• IP-IPeterot Rotosol Internet protocols
• Methods of packet information transfer are implemented on the basis of converting any type of information into a digital sequence, followed by dividing this sequence into packets equipped with all the necessary information for their identification, routing, error correction, which allows distributed distribution based on the use of computer networks in space, application process management.
• the main parameters affecting the performance of computer networks of distributed control of applied processes are the delay in transmitting data packets, a variation of this delay and jitter (unstable synchronization) of the output signals, while high-speed cycles are understood to mean cycles of applied processes with data sampling time applied process less packet transmission delays in a computer network.
• the delay in transmitting data packets over a computer network in the general case has several components: delays in encoding and decoding, delays at the input and output from the network, network delay in serialization, delay in the compensation buffer.
• the total delay of data packets in a network based on IP protocols can significantly exceed the data sampling period necessary for high-quality control of high-speed cycles of applied processes, which is an obstacle to real-time distributed control of high-speed cycles of applied processes through computer networks, since packet transmission delays data on a computer network and the variation of these delays significantly reduces the quality and stability of speed cycle control applied processes, up to not fulfilling management objectives.
• a known method and device for computer networks of distributed control of high-speed cycles of application processes in which cyclically with a given sampling period, data on the current state of the application process is encoded and formed into a data packet of the application process, which contains data on the current state of the application process and the formation time of the application process data packet, the application process data packet is transmitted to the computer network, the packet is received and buffered from the computer network you control commands, in accordance with a given sampling period, are extracted from the buffering queue and decode a packet of control commands, decoded control commands are transmitted to the application process.
• a disadvantage of the known method and device is that they do not allow to effectively achieve goals in computer networks distributed control of high-speed cycles of application processes due to the high level of data packet transmission delays, the presence of which reduces the quality and stability of controlling high-speed cycles of applied processes, up to not fulfilling control objectives.
• a disadvantage of the known method and device is the relatively low functional and technical characteristics when applied to computer networks of distributed control of high-speed cycles of applied processes.
• the known method and device does not allow to effectively achieve in computer networks the goals of distributed control of high-speed cycles of application processes due to the high level of data packet transmission delays, the presence of which reduces the quality and stability of controlling high-speed cycles of applied processes, up to not fulfilling control objectives. Disclosure of invention
• the objective of the invention is to develop a method and device for computer networks of distributed control of high-speed cycles of applied processes that would allow to implement and significantly improve the quality and stability of controlling high-speed cycles of applied processes in computer networks.
• the problem is solved in that the data packet of the application process is received from the computer network, data on the current state of the application process, extracted from the data packet of the application process, is used as initial conditions for modeling the dynamics of the application process, the modeling time interval is set as the total time of the predicted delays in transmitting application process data packets and control command packets over the network together with the simulation time of the applied process dynamics and buffer m time to compensate for variations in the delay of packet transmission over the network, for each received data packet of the application process on an accelerated time scale, the dynamics of the application process is simulated along with the simulation of the process of generating control commands, the control commands corresponding to the end point of the simulation time interval are placed in the control command packet , which also contains the time of transmission of control commands to the application process, which is defined as su mmm of the time of formation of the data packet of the application process and the simulation time interval, the packet of control commands is transmitted to the computer network, the packet of control commands is removed from the buffering queue when the current time of the application process reaches the value of the
• fig. 1 is a block diagram of a device.
• the device contains an application process sensor unit 1, the output of which is connected through an application process data encoding unit 2 to the input of an application process 3 data packet transmission unit, the output of which is connected to an input of a computer network 4, a control command packet reception unit 5, which the input is connected to the output of the computer network 4, and the output to the input of the buffering unit 6, the output of which is connected through the decoding unit 7 to the input of the block of regulators of the application process 8, the block of receiving data packets of the application process 9, the input connected to the output of the computer network 4, and the output through the modeling control unit 10 to the first input of the dynamics modeling unit of the application process 11, the output of which is connected to the input of the control unit 12, the first output of which is connected to the second input of the dynamics modeling unit of the application process 11, the second output of the control command block 12 is connected through the control command coding block 13 to the input of the control command packet transmitting block 14, the output of which is connected to the input of the computer network 4.
• the data encoding block of the application process 2 cyclically with a predetermined sampling period ⁇ t d converts the input signals about the current state of the application process into
• the digital form also implements the procedures for compressing information and forming a data packet of the application process, the structure of which is shown in Fig. 2.
• the application process data packet includes data on the current state of the application process and the formation time of the application process data packet t dn .
• the generated application process data packets are fed to the input of the application process data packet transmission unit 3, which transmits application process data packets over the Internet protocols to the computer network 4.
• the application process data packet receiving unit 9 from the computer network 4 receives application process data packets that the output unit of the data packets of the application process 9 are fed to the input of the simulation control unit 10.
• the simulation control unit 10 for each data packet of the application process generates initial conditions signals for modeling the dynamics of the application process and a signal of the formation time of the data packet of the application process t dn .
• the initial conditions signals for modeling the dynamics of the applied process, the signal of the specified simulation time interval ⁇ t and the signal of the formation of the application process data packet t dn are received at the first input of the dynamics modeling unit of the applied process 11, which for each set of initial signals conditions for modeling the dynamics of the application process determines the time of transmission of control commands in the application process t cn and starts at an accelerated time scale n the time interval ⁇ t simulations to model the dynamics of the application process.
• the status signals of the simulated application process and the time signal for transmitting control commands to the application process t cn are fed to the input of the control command block 12, which simulates the process of generating control commands from the first output of the block by the state signals of the simulated applied process control commands 12 are transmitted to the second input of the dynamics modeling unit of the applied process 11, thereby simulating a change in the current state to the simulator direct application process under simulated control commands.
• Simulation in the accelerated time scale of the dynamics of the application process together with the simulation of the process of generating control commands ends when the end point of the simulation simulation time interval ⁇ t is reached, in which the values of the control commands correspond to the predicted time t cn for sending control commands to the application process.
• control commands corresponding to the predicted time for transmitting control commands to the application process t cn From the second output of the control command block 12 signals control commands corresponding to the predicted time for transmitting control commands to the application process t cn , and a signal for transmitting control commands to the application process t cn are transmitted to the input of the control command encoding block 13, which performs information compression and generation of control command packets, the structure of which is shown in fig. 4.
• the control command package includes control commands corresponding to the predicted time of transmission of control commands to the application process t cn , and a signal of the transmission time of control commands to the application process t cn .
• the generated control command packets from the output of the control command encoding block 13 are received at the input of the control command packet transmission block 14, which transmits control command packets to the computer network 4 via the Internet protocols.
• the control command 5 receiving block from the computer network 4 receives control command packets, which from the output of the block receiving the packets of control commands 5 go to the input of the buffering block 6.
• a control command packet corresponding to time t cn is extracted from the buffering queue of buffering unit 6, which, from the output of buffering unit 6, is sent to the input of decoding unit 7.
• decoded control commands are sent to the input of control unit 8 of the application process.
• Generation of control commands for the predicted time of transfer of control commands to the application process t cn by means of modeling on an accelerated time scale the dynamics of the application process in conjunction with modeling we are in the process of generating control commands based on data on the current state of the application process in the time moment t dn makes it possible to compensate in computer networks for distributed control of high-speed cycles of application processes, delays in the transmission of packets over computer networks, variations of these delays and jitter of control commands for distributed control of high-speed cycles of application processes.
• the simulation of distributed control of high-speed cycles of applied processes in computer networks was carried out.
• An object that was described by 17th order nonlinear differential equations with a data sampling frequency of 50 ms was chosen as a controlled application process.
• the delay of the application process data packets varied in cycles randomly in the range of 75-500 ms
• the delay of control command packets varied in cycles randomly in the range of 75-500 ms.
• the operation of three application process control systems was investigated: the first is a test (locally located without packet transmission over a computer network) application process control system in which there are no packet transmission delays; the second is an application process control system distributed in a computer network similar to a test one, but with packet transmission delays over a computer network; the third is an application process control system distributed in a computer network with a delay in transmitting packets over a computer network, which is implemented in accordance with the claimed invention.
• test (locally located without packet transmission over a computer network) application control system in which there are no packet transmission delays was synthesized in accordance with the set management objectives and management quality criteria.
• the quality of work of the third application control system distributed in the computer network with the presence of packet transmission delays which is implemented in accordance with the claimed invention, allows achieving control objectives in the entire range of packet transmission delays for the entire spectrum of initial conditions of the application process, all types of tasks and management objectives with quality that meets the specified criteria for management quality.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Automation & Control Theory (AREA)
• Data Exchanges In Wide-Area Networks (AREA)
• Feedback Control In General (AREA)
• Control By Computers (AREA)

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Citations (6)

• 2006
  • 2006-09-08 UA UAA200609648A patent/UA83118C2/uk unknown
• 2007
  • 2007-09-07 RU RU2009106351/08A patent/RU2422888C2/ru not_active IP Right Cessation
  • 2007-09-07 WO PCT/UA2007/000052 patent/WO2008030206A1/ru active Application Filing

Patent Citations (6)

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