Method for optimizing network topology of urban rail train
A technology of network topology and optimization method, applied in data exchange networks, digital transmission systems, electrical components, etc., can solve problems such as inability to ensure optimal solutions, complex algorithm solutions, and no system optimization model proposed.
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Embodiment 1
[0049] First assume that there are three links and nodes with different reliability and price, and set relevant initial parameters, including the number of nodes, distance between nodes, maximum cost, unit price of nodes, reliability of nodes, unit price of links and reliability of links; set The initial parameter is based on the assumption that the network bandwidth is much greater than the amount of data in the network, and the logical topology planning can obtain the minimum delay of the network; for different nodes and links, different integers are used to represent their reliability: number 1 Represents the device with the best reliability, and the number 2 represents the device with the second best reliability, in the next row; if there are N kinds of devices with different reliability, the value range of each bit in the gene is (0-N), Where 0 means that the link does not exist, in figure 1 A network consisting of 4 nodes and 5 edges is shown in . The relationship betwe...
Embodiment 2
[0056] This example solves a practical problem.
[0057] Assume that there is a train consisting of 6 carriages, and there is a node in each carriage that needs to be connected to nodes in other carriages. Each car is 26 meters long, considering the wiring method, so it is assumed that if two adjacent nodes are to be connected, a 50-meter cable is required. The price and reliability of links and nodes still refer to Table 1 and Table 2. Solve the most stable network structure and shortest delay communication mode when the maximum construction cost is 17000 and 25000. And, considering the problem of signal attenuation, the maximum link length in the system must be less than or equal to 150 meters. Utilize method of the present invention, obtain the optimal solution of node connection mode in the train as table 3. Physical connection mode is as Figure 5 .
example 2
[0058] Table 3 Example 2 optimal solution
[0059]
[0060] Through example analysis, it can be known that the model and algorithm proposed by the present invention are reasonable and can solve corresponding practical problems.
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