Road network limitation capacity determining method based on pressure test

Abstract

The invention relates to a road-net ultimate capacity determination method based on pressure measurement, which belongs to the field of road-net traffic capacity control techniques and which is characterized in that: the method comprises the following steps of adopting the observation network of a computer to collect the traffic parameters of a road net; adopting a macroscopic traffic simulation and planning software Cube and a geographic information system software ArcGIS to generate road-net files and initial values of pressure measurement in the computer; adopting the software Cube to generate a pressure measurement model which performs the pressure measurement in a preset measurement period; calculating the road-net average saturation and the road-net average velocity; comparing the two calculated valves to the preset index values of the road-net average saturation and the road-net average velocity; judging whether the calculated valves meet the preset requirements; and if either fails, increasing the road-net traffic capacity and continuing the pressure measurement until both meet the requirement; and determining the road-net traffic capacity at the time as the road-net ultimate capacity. The road-net ultimate capacity determination method increases the calculation accuracy, reliability and efficiency and fills the blank of determining the road-net ultimate capacity basedon pressure measurement.

Description

technical field [0001] The invention belongs to the technical field of road network traffic volume control. Background technique [0002] As early as the early 1950s, some foreign scholars began to discuss the problem of road network capacity, and the research ideas were carried out according to the law from simple to complex. Among them, the representative countries are the United States, Japan and France. [0003] The United States is the earliest country to study road network capacity. In the early stage of research, the road network was simplified as a simple single-start-destination network, and the road network capacity was the maximum amount of traffic that could be transported from a specific starting point to another specific end point under the constraints of road capacity. With the in-depth understanding of the problem, the road network is regarded as a nonlinear, randomly open, complex system with multiple origins and destinations, so they established a new con...

AI Technical Summary

Problems solved by technology

However, there are the following problems: the definition of road network capacity is not uniform, so that the calculation results of various models are not comparable; the established model method does not fully grasp the key influencing factors of road network capacity, so that it is impossible to establish an appropriate impact model; the theoretical model It is difficult to calibrate the parameters of the model, and most of the models do not calculate an actual road network capacity, and only stay at the theoretical level. The practicability and accuracy are not good, and it is difficult to meet the actual needs of the development of my country's urban road network.

Since 2003, Bank of China, Industrial and Commercial Bank of China and other large banks have conducted stress tests on credit risk, interest rate risk, etc., but most of them use foreign ready-made theories and models, and they are all temporary

[0012] It can be seen that the research on stress testing in our country is still relatively small at present, and more achievements are borrowed from foreign countries, which are only used in software, finance and other fields, but no one has set foot in the transportation field that needs to test system performance.

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