43 results about "VisSim" patented technology

The invention relates to a traffic signal instrument control strategy comprehensive performance validity test system and a method, which relates to the test and evaluation of comprehensive operation performance and control strategies of a traffic signal instrument and validity evaluation on the control strategy of the signal instrument, and belongs to the control field of the traffic information signal. A virtual crossing traffic environment is established through a microscopic traffic simulation software VISSIM and interacted with a real traffic signal instrument, so that the signal instrument outputs a signal to control the traffic circulation in the virtual crossing traffic environment; and meanwhile, the traffic vehicle detection information in the virtual crossing traffic environment is returned to the traffic signal instrument. Through the synchronous running of the traffic signal instrument and the virtual crossing traffic environment, based on the traffic circulation evaluation function of the microscopic traffic simulation software VISSIM, the evaluation on the traffic circulation situation of a virtual crossing is realized, the traffic circulation situation is a control result of the traffic signal instrument, i.e. the test and evaluation on the comprehensive performance validity of the control strategy of the traffic signal instrument can be realized.

The invention discloses a method for setting the best distance between one-way matched roads, relative city traffic system managing technique, and traffic simulating technique. Wherein, it comprises following steps: 1, attaining the original data of one-way traffic network; 2, building relative project; 3, using VISSIM software to build simulating network; 4, according to actual traffic condition, selecting the evaluation standards in VISSIM software on vehicle, road, cross, and the whole road network, and building the evaluation standard database; 5, operating the VISSIM software to record the traffic simulated result; 6, based on said result, using matrix method to analyze the evaluation standard data; 7, building comparing matrix, calculating the weight of standards, checking the consistency of comparing matrix, and calculating integrated evaluation standard to find the sequence of several one-way traffic matched road distance methods; 8, finding the best distance of one-way matched roads.

The invention provides an urban intersection safety evaluation method based on an extreme value theory and microscopic simulation. According to the method, operating conditions of intersections in a peak period are collected through videos, recognition and data extraction are performed on an intersection conflict, simulation software VISSIM is adopted to perform traffic network simulation modelingand calibration, a conflict track file is extracted, and conflict data is screened; an extreme value model is adopted to perform modeling on the traffic conflict data, and accident risk rates of theintersections are calculated; specifically, a TCT method and an extreme value theory method (Strategy 3) are used to calculate risk degrees respectively, and a Pearson coefficient and a Spearman Rankcoefficient are compared; according to the Pearson coefficient, association calculation is directly performed on the number of actual accidents and safety risk indicators; and according to the Spearman Rank coefficient, safety ordering is performed on the intersections according to the risk indicators and the number of the actual accidents respectively, and the safety evaluation method most approximate to the safety reflected by the actual accidents is selected.

The invention provides an optimization method and device for the lane change space of a city expressway ramp area. The method comprises the following steps that: on the basis of an expressway simulation model obtained in a way that a modeling parameter is input into VISSIM software, setting different ramp exiting ratios, different main road one-lane car traffic volumes and different lane change spaces to obtain an optimal lane change space corresponding to each lane existing ratio and an optimal lane change space corresponding to each main road one-lane car traffic volume. By use of the optimization method for the lane change space, the expressway designed on the basis of the optimal lane change space enables vehicles to successfully pass in an exit lane area, and delay or congestion can be reduced.

The invention discloses a road network carbon emission estimation method serving for low-carbon road traffic planning, and the method comprises the steps: building a fitting function of an emission factor and a speed through an MOVES model carbon dioxide emission factor rule, and building a localized carbon dioxide emission factor database through motor vehicle fuel consumption data; establishing a road network peak hour road traffic volume estimation method based on the road traffic planning parameters; through local road traffic investigation, selecting videos of several important road sections to shoot road traffic conditions, obtaining basic parameters input into VISSIM simulation software, and obtaining average speed distribution of motor vehicles based on VISSIM simulation in various traffic scenes; and finally, establishing a road network carbon emission estimation method to effectively estimate urban road traffic carbon emission. The method can provide a carbon emission data basis for urban low-carbon road traffic planning, is of great significance to optimization of a low-carbon planning scheme and reduction of road network carbon emission, and is beneficial to improvement of an urban sustainable traffic system.

The invention discloses a traffic conflict prediction method based on space-time proximity, which belongs to the technical field of road traffic safety prediction. In view of limitations of the existing road traffic accident prediction method, in order to avoid the problem that the prediction method based on traffic accident data statistics does not have sufficient basic data, the traffic conflict prediction method based on space-time proximity is thus brought forward. The method comprises the following steps: 1, based on the space-time proximity, a speed difference and a vehicle-following distance serve as conflict severity two-dimensional evaluation indexes; 2, according to the two-dimensional evaluation indexes of the vehicle-following distance and the speed difference, the conflict severity is determined; 3, according to the two-dimensional conflict evaluation indexes and the determined actually-measured construction area data, VISSIM simulation software is applied to building a conflict simulation model, and the traffic flow operation condition in the construction road section is simulated; and 4, according to the simulation result, the traffic conflict prediction based on the space-time proximity is obtained. The method of the invention is used for traffic conflict prediction.

The invention discloses a dynamic traffic influence evaluation method for an urban road construction period. The method comprises the following steps: S1, determining a traffic influence range of an urban road construction project; S2, acquiring and processing mobile phone signaling data, filtering and denoising the data by matching the base station with the mobile phone signaling data, establishing a user position state table by collecting data in real time, and updating the latest state in real time; S3, setting parameters of a training set and a test set, and predicting the traffic volume and the vehicle speed by using a long-short-term memory neural network; S4, employing VISSIM software to simulate and analyze the saturation of each road section in different construction periods, thequeuing length of the signalized intersection, the average travel time and the average delay, and evaluating the traffic flow operation states in different construction stages. According to the invention, a set of complete dynamic traffic influence evaluation method is formed, and decision support is provided for traffic construction and management departments to implement traffic organization design in different construction stages.

The invention discloses an implementation method of design speed adjustment under vehicle networking based on VISSIM simulation. A city road model is built by applying VISSIM, a speed optimization model is established in MATLAB to simulate a speed optimization decision under the condition of vehicle networking, then results are imported into the VISSIM for real-time controlling, visualization simulation of two road models under the vehicle un-networking state and networking state is realized, finally, evaluation data are output and compared, and thus the road design speed is adjusted. According to the implementation method of design speed adjustment under vehicle networking based on VISSIM simulation, the analysis result shows that through the speed optimization model established in the MATLAB, driving conditions under vehicle networking can be controlled and simulated in the VISSIM, and the vehicle travel speed, travel time, delay time, and other data are obtained; and the road modelin the VISSIM is controlled through the vehicle speed optimization decision established in the MATLAB, and the implementation method of design speed adjustment under vehicle networking is provided.

A coordinate signal timing dial optimization method capable of lowering vehicle delay and traffic emission is applicable to main line intersection groups with (without) left-handed rotation short lanes. On the basis of impact analysis of coordinate signals on the main line traffic flow, short-lane space optimization is considered, and a main line intersection group space-time resource allocation optimization model is constructed, and the main line intersection group signal timing dial optimization model is constructed for determining the short-lane space. In order to evaluate the operating efficiency and the environmental conditions of main line intersection groups, three performance indexes of the specific form are provided, and a lane group average traffic delay estimation method and a traffic light period emission factor calibration method are improved. Then, technological application processes for models and methods are given for various conditions. By means of traffic simulation software VISSIM and programming software MATLAB, a computational example is used for explaining the technological application processes. A result shows that the novel method can integrally allocate time-space resources for main line intersection groups, the minimization of vehicle delay and traffic emission is achieved, and the method can be widely applied to signal timing dial design and optimization.

The invention relates to an urban center area simulation road network platform, in particular to a system and a method for constructing a simulation road network platform based on Vissim, equipment and a storage medium, and belongs to the field of vehicle-road collaborative simulation. The invention aims to solve the problem that the simulation demand of real-time acquisition and interaction of data such as vehicles and signals in simulation in the field of urban center simulation application for the Internet of Vehicles and the like cannot be met at present. A simulation road network platform constructed based on Vissim comprises road networks, signals, traffic demands and the like, and is developed by adopting a Python language through a Vissim Com interface mode. Data such as road networks, vehicles and signals of a simulation system are packaged according to data models of a road side unit RSU and an on-board unit OBU, and are provided for algorithm and vehicle-road cooperation application test verification through an RPC communication architecture mode; and traffic model parameters are corrected through section flow and road section speed, the accuracy, timeliness and interactivity of an application simulation scene are improved, and the universality of the platform is improved through algorithm test verification.

The invention discloses a VISSIM and MATLAB based internet-of-vehicle simulation platform construction method, including the steps of simulating vehicles through the VISSIM, saving a road network to astorage directory, registering a VISSIM COM interface object in the VISSIM, creating a VISSIM COM service interface in the MATLAB, loading the road network and setting simulation parameter through the MATLAB according to the road network storage directory, acquiring information of traffic objects in real time through the MATLAB, calculating traffic model optimization results and feeding the results to the VISSIM, performing optimization control to the traffic objects through the VISSIM according to the optimization results. By the method, the internet-of-vehicle simulation platform can be constructed rapidly while various algorithms in the environment of the internet-of-vehicle can be realized, workload in programming is reduced greatly, and meanwhile, effects of various traffic models and algorithms can be tested; therefore, the method has high practicability and has a great significance in development of various intelligent traffic models and control algorithms in future.

The invention discloses a road intersection safety risk index calculation method, and the method comprises the steps: building a simulation model of a road intersection in a VISSIM, carrying out the simulation experiment, and outputting a track file; analyzing the track file in the SSAM to obtain a conflict statistical result, wherein the conflict statistical result comprises an included angle between conflict vehicle directions and a conflict attribute metering index; dividing conflicts of the road intersection into conflict types according to different danger levels and the included angles between the conflict vehicle directions; calculating a conflict risk index of each conflict in each conflict type according to the conflict attribute metering index; calculating the danger weight of each conflict type according to the value distribution of the conflict risk index of each conflict in each conflict type; and obtaining the safety risk index of the road intersection according to the danger weight of each conflict type and the statistical number of each conflict type.

The invention discloses a traffic event-oriented highway traffic control effect evaluation method, and belongs to the technical field of traffic management and control. The method comprises the stepsof: 1, collecting traffic event information, historical traffic operation information, road basic information and traffic management and control mode information; 2, discretizing time points, and collecting traffic data after an event occurs; 3, utilizing VISSIM software to predict evolution of the traffic operation state after the event occurs under the condition of no control, and calculating anevaluation index; 4, determining an event influence range under a control condition according to an improved input and output model, and calculating the evaluation index; 5, comparing the index difference to obtain an evaluation result; and 6, finally determining the weight of traffic facilities, and calculating the service level index of the traffic system. According to the method, the traffic control effect is completely evaluated through calculation of the lifting indexes of the facilities influenced by traffic control and calculation of the comprehensive traffic system indexes.

The invention provides a method for determining the shielding probability of an expressway portal type traffic sign large vehicle, and belongs to the technical field of urban road traffic control. Themethod comprises the steps that firstly, the effective visual reading distance of shielding of the large vehicle is calculated on the basis of a driver visual recognition process mechanism; then according to the traffic volume, the traffic composition, the vehicle speed, the sign size and the visual recognition distance, a VISSIM simulation model of shielding of the expressway portal type trafficsign large vehicle is established; finally, simulation is carried out according to different traffic volumes and large vehicle proportion scenes, and the shielding time and the shielding probabilityare output. According to the method, the problem that an existing technology is not accurate in calculation of the shielding probability of the expressway portal type traffic sign large vehicle is solved. The method can be used for setting traffic signs.

The invention provides a road network parameter correction method specific to VISSIM. The method comprises the following steps: (1) determining a parameter correction target; (2) selecting an evaluation index; (3) selecting a parameter to be corrected; (4) acquiring practical road data and evaluation index data; (5) performing route network modeling and simulation run; (6) correcting the parameter to be corrected; (7) calculating the weight and sensitive factor of each road segment; (8) multiplying respective obtained convergence correction parameter value of each road segment with respective sensitive factor respectively, and performing summation to obtain the correction parameter of a global road network. The correction method is irrelevant to the structure of simulation software, so that the correction method is suitable for the mentioned VISSIM software and can be applied in other simulation environments. Parameter automatic correction is performed with a generalized regression neural network method in the method, so that the simulation time can be shortened effectively; the iteration times are reduced; and the correction efficiency is increased effectively.

The invention discloses an urban expressway interleaving area dynamic influence range calculation method based on VISSIM simulation, which comprises the following steps: firstly, constructing a VISSIM simulation model according to design parameters of an urban expressway interleaving area and upstream and downstream road sections thereof, and selecting proper driving behavior parameters and simulation parameters; inputting different main road driving-in traffic volume data and main-main traffic volume to main road driving-in traffic volume proportion data to carry out traffic simulation, and extracting traffic flow running speed parameters of each lane on the data acquisition points; then drawing a position-speed scatter diagram under each simulation condition, and defining the influence range of each lane under the condition according to a defining method; and finally, drawing scatter diagrams of different traffic conditions and corresponding interlaced area influence ranges, fitting to obtain a function relationship, and obtaining a formula for calculating the dynamic influence range. The method for calculating the influence range of the urban expressway interleaving area under different design parameters and different traffic conditions is provided, and a research basis is provided for traffic organization of the urban expressway interleaving area.

The invention discloses a BIM-based road driving simulation environment establishment method. The method comprises the following steps: loading a project file of JSL-route expert system road design software to form route design data; decomposing the design data elements, and mapping the decomposed design elements into road engineering information model design elements in a LandXML format; mapping the design elements into lane data supported by PTV-VISSIM; analyzing the road engineering information model data in an FDB format, and converting the data into a three-dimensional model in an FBX/OBJ/DAE format; based on the road engineering information design elements in an LandXML format, constructing a driving road and terrain along the line in driving simulation software; based on the three-dimensional model in the FBX/OBJ/DAE format, arranging a scene object model in driving simulation software; and based on traffic simulation analysis software PTV-VISSIM and a driving simulation system data exchange module, creating a simulation driving model in a driving simulation system. According to the invention, a driving simulation project environment can be rapidly constructed, a road simulation traffic flow can be constructed, and an engineering environment and a driving environment after a road is constructed can be simulated.

The invention discloses a tramcar simulation system based on road traffic interaction. The tramcar simulation system comprises a tramcar passenger module, a tramcar operation module, a tramcar equipment module, a road traffic module and an output module. The real running process of the tramcar is simulated, besides the running process of the tramcar, various traffic participants involved in a tramcar system can be synchronously simulated, real-time interaction with road traffic simulation is completed through a COM interface of the VISSIM, deep integration with road traffic simulation software VISSIM is achieved, the influence of the interaction between the tramcar signal and the road traffic signal on the regional traffic network is reflected, the signal priority strategy of the tramcar at the intersection is realized, and the support is provided for the efficient operation of the tramcar. And the efficiency of the tramcar operation plan is evaluated, and the road traffic signal timing is correspondingly adjusted, so that an efficient driving scheme can be conveniently formulated.