JPH07210521A - Real time simulation system - Google Patents

Abstract

PURPOSE:To utilize a low-priced and miniaturized control computer and to connect a lot of control computers by securing real time property by exchanging and making common data, which are used for simulation processing at the respective control computers, through a network for each calculation cycle. CONSTITUTION:Respective control computers 2 perform respectively individual simulation processing (individual processing) by using the shared data stored in a memory 8. Afterwards, the updated data are transmitted through a bus type network 5 to all the control computers 2. When the data are received from the other control computer 2, on the other hand, those data are stored in the memory as one part of shared data and used for the following simulation processing (individual processing). By repeating this operation as one calculation cycle, all the control computers 2 immediately share the data updated at the respective control computers 2 and use them for the simulation processing (individual processing) so that real time simulation can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a real-time simulation system composed of a plurality of control computers and a network.

[0002]

2. Description of the Related Art In a real-time simulation system using a plurality of control computers, as shown in the conceptual diagram of a conventional system using a shared memory device shown in FIG. It is necessary to perform a simulation process (individual process) based on 7 and to secure the real-time property by repeating this process. Each control computer 2 is connected to the shared memory device 6, and each control computer 2 is connected to the shared memory device 6. This is realized by taking a method of referring to or updating the shared data 7. However, such a real-time simulation system has a problem that the cost increases because it is necessary to use an expensive dedicated control computer 2 so that it can be connected to the shared memory device 6. Also, the shared memory device 6
There is a limitation that the number of control computers 2 that can be connected to the computer is limited, and the number of control computers 2 is limited to about 10 at the most.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such circumstances, and provides a real-time simulation system in which an inexpensive and small control computer can be used and a large number of control computers can be connected. The purpose is to

[0004]

To this end, the present invention provides a real-time simulation system consisting of a plurality of control computers, in which these control computers are connected by a network and simulated in order to perform real-time simulation by distributed processing. Data used in processing (individual processing) is exchanged via the network for each calculation cycle to be shared to ensure real-time processing, and one calculation cycle corresponds to the communication period for data exchange by the network and each In the individual processing period for performing simulated calculation inside the control computer, by performing the separation-type processing that is performed separately in all control computers at the same time by aligning the feet, it is possible to synchronize the operation of each control computer. Characterize each.

[0005]

In the real-time simulation system of the present invention, each control computer uses the shared data stored in the memory, and individually executes a simulation process (individual process). After that, the updated data is transmitted to all control computers via the network. When data is received from another control computer, it is stored in the memory as a part of shared data and used for subsequent simulation processing (individual processing). By repeating this as one calculation cycle, all control computers immediately share the data updated by each control computer and use it for simulation processing (individual processing).
Real-time simulation can be realized.

Further, in the real-time simulation system of the present invention, when it is necessary to deal with a phenomenon that causes inconsistency of use data and time lag, one of all control computers is set as a command control computer, and communication is performed from this command control computer. A trigger signal for starting the processing period is sent to all control computers including itself. Each control computer sequentially starts transmission processing by this trigger signal, and other control computers perform reception processing. After that, when the command control computer confirms that the data exchange between all the control computers has been completed, it sends a trigger signal for starting the individual processing period to all the control computers. Then, each control computer simultaneously starts the simulation processing (individual processing) by this trigger signal. As described above, by repeating one calculation cycle into two steps of the communication processing period and the individual processing period in a clearly separated manner, the data calculated in one cycle is processed before the individual processing in the next cycle is performed. Since it is always exchanged, real-time simulation with consistent data becomes possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the real-time simulation system of the present invention is applied to a system for training personnel by simulating the motion / attack of a ship / aircraft in real time will be described with reference to the drawings.
Is a block diagram of the present system, FIG. 2 is an explanatory diagram of a first processing aspect of the present system, FIG. 3 is an explanatory diagram of a second processing aspect of the system, and FIG. 4 is an explanation showing mismatch of use data and time lag. It is a figure. In FIG. 1, the present system includes a plurality of control computers 2 including one command and control computer 1 for controlling periodic processing, a simulated device 3 simulating a device used in a ship / aircraft, and a control computer 2. It is composed of a bus type network 5 of a bus type to be connected. The control computer 2 has a memory 8 for storing shared data.

Explaining the processing mode of such a system, as shown in FIG. 2, each control computer 2 uses the shared data stored in the memory 8 and performs individual simulation processing (individual processing). . After that, the updated data is transmitted to all control computers 2 via the bus network 5.
When data is received from another control computer 2, it is stored in the memory 8 as a part of shared data and used for subsequent simulation processing (individual processing). By repeating this as one calculation cycle, all the control computers 2 immediately share the data updated by each control computer 2 and use it for simulation processing (individual processing), so that real-time simulation can be realized.

However, even in the real-time simulation system using the bus network 5, each control computer 2 is individually operated in one calculation cycle due to the general characteristic of the network that communication is performed at random timing. Since the simulation process (individual process) and the data transmission are performed at the timing of, the process of A of the control computer # 1 in the nth cycle is The data updated by the control computers # 1 and # 2 in the nth cycle and the data updated by the control computer # 3 in the n-1th cycle are used. Similarly, in the process A ′ of the control computer # 2, the control computer # 2 is used. There occurs a phenomenon that 2 uses the data updated in the nth cycle and the control computers # 1 and # 2 update the data in the n-1th cycle. Therefore, when it is necessary to deal with such a phenomenon, as shown in FIG. 3, first, in response to a trigger signal from the command control computer 1, each control computer 2 sequentially updates the data in the bus according to a preset order. Broadcast transmission to all control computers 2 via the type network 5. At that time, the other control computer 2 will perform reception. Each control computer 2 receives the data and stores it in the memory 8 as part of the shared data 7. After that, when the command control computer 1 detects that the data exchange between all the control computers 2 is completed, the command control computer 1 sends a trigger signal to all the control computers 2 so as to perform a simulation process (individual process). Then, this signal causes each control computer 2 to store its own memory 8
Using the shared data stored in, the simulation processing (individual processing) of the motion / attack of the ship / aircraft is performed. By repeating the above processing as one calculation cycle, all control computers 2 can immediately share the data updated by each control computer 2 and use it for the simulation processing (individual processing) of the next cycle. Real-time simulation enables effective training.

Thus, since this real-time simulation system uses the bus type network 5 for data exchange between the configuration control computers 2, it is not a dedicated control computer for a shared memory device which is expensive as 100 million yen, but one unit You can use a small workstation that is as cheap as 1 million yen.
Furthermore, a control computer 2 that can be connected to the bus network 5
Is several hundreds to several hundreds, and a larger number of control computers 2 can be connected than before. Moreover, since the calculation cycle is divided into two, that is, the communication processing period and the individual processing period, and is performed for all the control computers 2 in the apparatus at the same time, perfect synchronization can be achieved. It has the effect that it can be processed.

[0011]

In summary, according to the present invention, in a real-time simulation system composed of a plurality of control computers, these control computers are connected by a network,
In order to perform real-time simulation by distributed processing, the data used in the simulation processing (individual processing) of each control computer is exchanged via the network for each calculation cycle and shared to ensure real-time performance, and one calculation cycle In the communication period for exchanging data via the network and the individual processing period for performing simulated calculation inside each control computer, separate type processing that is performed separately is performed at the same time on all control computers. By synchronizing the operation of each control computer, an inexpensive and small control computer can be used, and a real-time simulation system to which a large number of control computers can be connected is obtained. Therefore, the present invention is extremely useful industrially. .

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a real-time simulation system of the present invention.

FIG. 2 is an explanatory diagram of a first processing mode of the present system.

FIG. 3 is an explanatory diagram of a second processing mode of the present system.

FIG. 4 is an explanatory diagram showing a temporal shift of mismatch of usage data.

FIG. 5 is a conceptual diagram of a conventional real-time simulation system using a shared memory device.

[Explanation of symbols]

 1 Command and control computer 2 Control computer 3 Simulated device 5 Bus type network 6 Shared memory device 7 Shared data 8 Memory

Claims (2)

[Claims] 1. In a real-time simulation system comprising a plurality of control computers, these control computers are connected by a network, and data used in simulation processing (individual processing) of each control computer is carried out in order to perform real-time simulation by distributed processing. A real-time simulation system characterized by ensuring real-time performance by exchanging via a network for each calculation cycle and making it common. 2. All control of separate type processing, in which one calculation cycle is divided into a communication period for data exchange by a network and an individual processing period for performing simulated calculation inside each control computer. The real-time simulation system according to claim 1, wherein the operations of the respective control computers are synchronized by aligning the feet in the computer and performing them simultaneously.