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Method for computing cross turning ratio based on genetic calculating method and large entropy mould

A genetic algorithm and turning ratio technology, applied in the field of calculating the turning ratio of intersections, can solve the problem that the "optimal" solution cannot be excluded, and achieve the effect of improving efficiency

Inactive Publication Date: 2007-12-19
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Problems solved by technology

In addition, since the genetic algorithm is a random search method, this method cannot rule out the possibility of other "optimal" solutions that may exist

Method used

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  • Method for computing cross turning ratio based on genetic calculating method and large entropy mould
  • Method for computing cross turning ratio based on genetic calculating method and large entropy mould
  • Method for computing cross turning ratio based on genetic calculating method and large entropy mould

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Embodiment Construction

[0042] As shown in Figure 2, the specific implementation steps of the present invention are as follows:

[0043] (1) Input the flow data of the research intersection and its adjacent intersections in a certain period of time;

[0044] (2) Set the genetic operator and its control parameters of the genetic algorithm, define the search space for the genetic algorithm solution and the total number of solutions;

[0045] a. Set the total number of genetic algorithm solution runs. Due to the intelligent calculation method, this parameter can take a larger value, such as 500, or even 1000.

[0046] b. The minimum error of the acceptable genetic algorithm solution. This parameter can be adjusted as needed, and generally should not be greater than 5%.

[0047] Set genetic operators and control parameters, see Table 1.

[0048] Table 1 Genetic operators and control parameters

[0049] The maximum number of iterations

100

mutation probability

0.01

po...

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Abstract

A method for calculating the steering ratio at road cross based on genetic algorithm and maximum entropy model includes inputting flow rate data in certain time slot at study road cross and adjacent road cross, setting operator and control parameter of said algorithm and defining its search space and total frequency of solving solution, initializing calculation environment of said algorithm, executing genetic algorithm, calculating entropy of obtained solution and judging whether said total frequency is up or not if precision of obtained solution is satisfied and using solution corresponding maximum entropy as final solution if it is.

Description

technical field [0001] The invention relates to a method for calculating the turning ratio of an intersection, in particular to a method for calculating the turning ratio of an intersection based on a genetic algorithm and a maximum entropy model, which is suitable for road traffic planning and traffic management control. Background technique [0002] For a city's traffic network, the turning ratio (also known as diversion coefficient, turning probability, etc.) channelization) is an indispensable and important data. [0003] Usually, for intersections with few branches (such as less than 4 branches), the turning ratio of the intersection can be obtained by manual counting. But for intersections or intersections with more than 4 branches, manual counting is difficult to distinguish the whereabouts of the traffic flows at each entrance. Therefore, manual counting alone cannot fully determine the turning ratio of an intersection. In fact, there is a relationship between the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/00G08G1/01G06N3/12
Inventor 王劲峰孙腾达王海起
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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