A Design Method of Urban Discrete Traffic Network Based on Road Load Balance
A traffic network and road load technology, applied in the field of traffic engineering, can solve problems such as unbalanced road load, low traffic flow in some road sections, and large traffic flow, so as to achieve the effect of improving sustainability and safety
Active Publication Date: 2022-05-27
SOUTHEAST UNIV
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Problems solved by technology
[0003] Technical problem: In the actual traffic network, there is often the problem of unbalanced road load, that is, some road sections have a large traffic flow, while some road sections have little traffic flow
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[0023] Below in conjunction with the accompanying drawings of the description, the present invention will be further described:
[0024] Step 1: Urban Discrete Transportation Network Design Model
[0025] Usually, the ratio of the actual flow of the road to the capacity of the road is used as the load level of the road. Suppose the flow of road segment a is x a , the capacity is c a , then the load level of the road section is expressed as x a / c a . The present invention proposes that the design of the traffic network should take the balance of the load levels of each road section as the policy objective, that is, the policy objective of taking the minimum variance of the load levels of each road section as the policy objective, which is expressed as:
[0026]
[0027] where n is the number of road segments in the traffic network. Taking into account the congestion effect, the travel time of the road segment is a function of the traffic flow t a (x a ), where x a ...
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The invention provides an urban discrete traffic network design method based on road load balancing. In the planning of urban traffic network, it is necessary to avoid the problem of unbalanced distribution of road traffic flow, that is, some road sections are overcrowded and some road sections have less traffic. The former is easy to damage the road while the latter does not fully use the road resources. In order to make balanced use of road resources and keep the service level of each road section at a similar level, the present invention establishes an urban discrete traffic network design method based on road load balance. The main steps include: (1) Establish a two-level programming model for urban discrete traffic network design. The upper layer goal is road load balance, the constraint condition is capital budget, the decision variable is the construction plan of candidate road sections, and the lower layer is user balance; (2) adopt The iterative optimization algorithm is used to solve the model; (3) The specific implementation and the effectiveness of the method are described in combination with the Nguyen-Dupuis network commonly used in traffic network analysis.
Description
Technical field: [0001] The invention relates to an urban discrete traffic network design method based on road load balance, and belongs to the technical field of traffic engineering. Background technique: [0002] The traffic network design problem is a problem that considers the user's route selection behavior, and selects the reconstructed or new road section under the given constraints, so as to optimize the performance of a certain network. This research question is the focus and difficulty of the research in the field of transportation planning, which is extremely challenging and has aroused the research interest of many scholars. The traffic network design problem is a typical leader-follower two-level planning problem. The upper-layer problem is a certain performance optimization of the transportation network, and the lower-layer problem is usually the user balance problem. Common network performances include system impedance, environmental pollution, backup capacit...
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IPC IPC(8): G06F30/18G06Q10/04G06Q50/30G06Q50/26
CPCG06Q10/047G06Q50/26G06F30/18G06Q50/40Y02T10/40
Inventor 林宏志褚晨予
Owner SOUTHEAST UNIV