38 results about "Conical intersection" patented technology

A hydrodynamically lubricating seal has a generally circular seal body defining a static sealing surface and having a dynamic sealing lip projecting from the seal body and defining a dynamic sealing surface, a non-hydrodynamic edge and a non-circular angulated flank having a flank angle. The flank angle and the dynamic sealing surface have theoretical intersection being positioned from the non-hydrodynamic edge by a variable distance having a minimum dimension being greater than {fraction (1 / 16)} inch and also having a maximum dimension. The circular seal body defines a theoretical center-line and, when viewed in a longitudinal cross-section taken along the theoretical center-line, a hydrodynamic inlet curve is shown that blends the theoretical intersection between the flank angle and the dynamic sealing surface. This hydrodynamic inlet curve is tangent to the dynamic sealing surface at a location of tangency and has a rate of curvature less than the rate of curvature of a ⅛ inch radius.

The invention provides a varying-period signal coordinating and controlling method of road intersections. The method solves the problems that main road intersection signal coordinating and controlling methods in the prior art cannot flexibly conduct optimization or adjustment of the period, scheme and phase difference of traffic signal control in real time according to traffic flow changes. The method effectively improves the green light utilization rate and passing capability of road intersections, reduces the frequency of vehicle stopping, ensures main road green wave coordination and control effect, achieves quick transition of signal coordinating and controlling schemes at the same time, and eliminates influence to traffic caused during the scheme transition. The method monitors traffic flow data of each intersection in real time, calculates the optimal coordinating and controlling common period in real time, optimizes and adjusts city main road traffic signal coordinating and controlling schemes, selects the optimal phase difference, enables the main road traffic signal coordinating and controlling schemes to adapt to road traffic flow changes quickly, and thus improves the effect of main road traffic signal coordinating and controlling.

An integrated single-piece exhaust system (SPEX) with modular construction that facilitates design changes for enhanced aerodynamics, structural integrity or serviceability. The SPEX defines splined or curved exhaust path surfaces, such as a series of cylindrical and frusto-conical sections that mimic curves. The constructed sections may include: (i) a tail cone assembly fabricated from conical sections that taper downstream to a reduced diameter; or (ii) an area-ruled cross section axially aligned with one or more rows of turbine struts; or both features. Modular inner and outer diameter inlet lips enhance transitional flow between the last row blades and the SPEX, as well as enhance structural integrity. Modular strut collars have large radius profiles between the SPEX annular inner diameter and outer diameter flow surfaces, for enhanced airflow and constant thickness walls for uniform heat transfer and thermal expansion. Scalloped mounting flanges enhance structural integrity and longevity.

The invention discloses an automatic extraction method for the urban road network information of a high resolution remote sensing image. The automatic extraction method is characterized in comprisingthe following steps that: S1: on the basis of an improved watershed segmentation algorithm, selecting a proper local homogeneity threshold value, rejecting a local minimum small-area region, removingsmall plaques, and carrying out region combination to solve an over-segmentation problem; S2: in an object-oriented method, adopting geometrical characteristics and context characteristics, utilizingurban road network characteristics to extract a road image object and process occlusion problems in an image; S3: quickly and accurately extracting the position of a road intersection through an automatic extraction method of the road intersection in the high resolution image, and providing a basis for the topological connection of a road; and S4: aiming at the problems, including holes in surfaceshaped roads, fracture among road sections and the noise of "same spectrum with different objects" to lay a foundation for the topological connection of road extraction, and adopting two topologicalconnection methods to effectively connect road interruptions among road strips and road intersection positions for the large road interception in the road extraction result to further perfect the roadnetwork information.

The invention discloses a method of resolving traffic conflicts of two vehicles at a no-signal intersection, mainly solving the problem of collision of two vehicles at an intersection. The method comprises: first, collecting the information of two vehicles, and predetermining whether two vehicles conflict at an intersection according to the time of the two vehicles arriving at the intersection; second, building an analytical hierarchy structure to determine the priority of the conflict vehicles; employing a PID controller to control the time of two vehicles arriving at a conflict area so as to resolve conflicts, and optimizing parameters of the PID controller; and finally building a gaming model to optimize a conflict resolving strategy and to allow the two vehicles to pass through the intersection within shortest time. The method employs the PID controller to control the time of two vehicles arriving at a conflict area so as to resolve conflicts, and optimizes parameters of the PID controller, thereby increasing the efficiency of solving conflicts between two vehicles, and reducing traffic conflicts at an intersection.

The invention relates to an improved traffic signal control method based on Q learning. The method comprises the following steps that 1, initial lookup tables corresponding to all intersections inside a region are obtained under the simulation environment, and the initial lookup tables include environment information states, intersection actions and corresponding Q values; 2, environment information of all traffic intersections is detected continuously through sensors installed on the traffic intersections under the actual traffic environment; 3, a local intersection is selected inside the region, an intersection signal switching algorithm is adopted for judging whether signal switching is needed at the local intersection or not according to the environment information of the traffic intersections and the initial lookup tables, and a function is updated according to the Q values to update the initial lookup tables; 4, another intersection is selected, the third step is executed again, and finally signal control of all the intersections inside the region is completed. Compared with the prior art, the method has the advantages of considering the intersection linkage, achieving computation accurately and conveniently and the like.

The invention relates to a city road intersection signal coordination control optimization method. Compared with the prior art, based on analysis of the upstream vehicle flow state and the downstream vehicle flow state of adjacent intersections, the state value of a signal control intersection is determined with the fluctuation theory for reference by comparing the amplitude of stopping waves of the upstream intersection and the amplitude of starting waves of the downstream intersection and analyzing the vehicle queuing condition in the artery direction of the upstream intersection, reliable intervals for signal coordination control under different states can be obtained, queuing overflow of oversaturated intersections can be controlled within a certain range, the probability that the oversaturated intersections are deadlocked is greatly reduced, meanwhile, queuing overflow becomes beneficial self-control of the road intersections under the oversaturated condition, and the purpose of the method is achieved.

The invention discloses a real-time calculating method for saturation flow rate of a signal intersection. The real-time calculating method comprises the steps of calculating a time headway of vehiclesin an inlet channel in a period; if the number of the vehicles in the inlet channel in the period is lower than a vehicle threshold, calculating the saturation flow rate of the inlet channel in the period by means of an empirical saturation time headway; if the number of the vehicles in the inlet channel in the period is higher than or equal with the vehicle threshold, setting a saturation time headway threshold interval according to the vehicle type, thereby obtaining the time headway in the saturation state; if the number of the vehicles in the saturation state of the inlet channel in the period is lower than the vehicle threshold in the saturation state, calculating the saturation flow rate of the inlet channel in the period through the empirical saturation time headway; if the numberof the vehicles of the inlet channel in the saturation state in the period is higher than or equal with the vehicle threshold in the saturation state, calculating the saturation time headway of the inlet channel in the period, and obtaining the corrected saturation flow rate of the inlet channel in the period through a mean value correction method. The real-time calculating method improves calculation accuracy and satisfies a requirement for dynamically extracting the saturation flow rate.

The invention discloses an intersection signal optimizing control method in a heterogeneous traffic state. The method comprises the following steps that an intersection with heterogeneous traffic flow convergence serves as a research object, a video detector is installed on the intersection, and heterogeneous traffic characteristics of all entrance lanes are identified; a vehicle driving simulation model is established according to the heterogeneous traffic characteristics of all the entrance lanes, heterogeneous traffic flows are simulated, and saturation flows of all the entrance lanes are obtained; signal parameters are optimized on the basis of an all-phase equisaturation principle, and a signal timing plan of the intersection is obtained. By means of the intersection signal optimizing control method in the heterogeneous traffic state, maximum utilization of traffic capacity of the intersection can be achieved, delay of the heterogeneous traffic flows for passing through the intersection is greatly reduced, and the operating efficiency of the signal intersection is improved.

A method, apparatus, system, article of manufacture, and computer readable storage medium provide the ability to optimize a design for a vertical road profile. A ground surface profile is obtained. From the ground surface profile, an initial set of points of vertical intersection (PVIs) are obtained. An optimized earthwork cost for the PVIs is determined. The PVIs and curve configurations are then modified to reduce the earth work cost.

The invention discloses an urban intersection traffic state discrimination method based on radio frequency RFID data. The method includes: determining an intersection traffic state description parameter, performing RFID data screening and cleaning and base station comparison preprocessing, and determining an operation track between an upstream base station and a downstream base station of a vehicle intersection through license plate comparison; then obtaining the intersection delay times and saturation estimation values by employing compared vehicle recording data; and finally classifying the delay times and the saturations in different periods of the intersection through hierarchical clustering, and determining the operation state of the intersection with the combination of different categories of the intersection delay times and saturations. According to the method, the urban intersection traffic state can be discriminated, certain basis is provided for traffic guidance, traffic control and guidance information can be published, and effective coordination of traffic control and guidance can be realized.

The invention provides a grid model based signal intersection operation evaluation method. The method comprises: constructing a grid model of a road intersection, and performing direction classifyingprocessing on trajectory data of floating vehicles passing through the urban road intersection on the basis of the grid model; obtaining traffic operation parameters of the road intersection, whereinthe traffic operation parameters include the traffic flow of the road intersection, the traffic time of the road intersection, the free flow time of the road intersection, and the average traffic speed of the road intersection; and calculating the traffic delay time of the road intersection according to the traffic operation parameters of the road intersection, and performing operation evaluationon the road intersection according to the traffic delay time. The method can traverse all the signal road intersections of the selected area under the condition of abandoning the map restriction, canperform real-time dynamic evaluation on the road intersections, can diagnose the cause of the road intersection delay, can ensure the accuracy of the evaluation diagnosis, and can improve the trafficefficiency of the road intersection.

The invention belongs to the field of road traffic safety. In order to provide a method for traffic safety evaluation during phase switching and achieve the purpose, the invention adopts the technical scheme that the method for evaluating traffic safety of signal intersection during phase switching facing an operation management stage comprises the following steps of: calculating encountering time difference PET, wherein PET=(Y+AR+te)-tc-Te; calculating collision loss of momentum, assuming that two cars collide with each other by keeping the original speed, according to the collision kinetic theory, calculating the loss of momentum before and after collision according to formula 5, wherein the system collision before momentum Pm; calculating the collision occurrence probability P; and carrying out evaluation on the traffic safety of the intersection during phase switching. The method is mainly applied to the design of roads meeting the requirement of traffic safety.

The invention provides a self-adaptation control method and system for traffic flow anti-overflow at a signal-controlled intersection. The self-adaptation control method for the traffic flow anti-overflow at the signal-controlled intersection comprises the steps of judging whether a queue overflow phenomenon happens at a downstream intersection; when the queue overflow phenomenon happens, detecting the remaining green light time of a current release phase, and detecting the queue overflow situation of the next phase which is adjacent to the current release phase; carrying out anti-overflow self-adaptation control on the traffic flow of the current release phase according to the remaining green light time; carrying out adjustment on the phase sequences of the next phase and a follow-up target phase, so as to carry out anti-overflow self-adaptation control on the traffic flow, wherein the follow-up target phase is positioned behind the current release phase and is not adjacent to the current release phase, and the queue overflow situation of the downstream intersection of the phase does not meet the preparatory condition. According to the method, the traffic flow anti-overflow self-adaptation control can be realized at the signal-controlled intersection, and the self-adaptation control effect can be improved.

The invention discloses a method and a system for dynamically guiding the travel speed of a network-connected vehicle during the green-light phase of multi-signal intersections, wherein a vehicle is guided to pass through two continuous intersections with the minimum consumed fuel oil as the target, and the speed optimization track of the vehicle is supplied to a driver in real time in a visual manner. As a result, the idle running time of the vehicle at intersections and the unnecessary operations of the vehicle, such as sudden acceleration and unnecessary sudden deceleration, can be avoided.Therefore, the extra fuel consumption and the extra tail gas emission of the vehicle are avoided. Meanwhile, the road traffic capacity is improved, and the travel requirements of people are met. Thetravel efficiency of people is improved.

The invention discloses a pedestrian detection and recognition system for city intersections based on C-V2X (Cellular Vehicle-to-Everything). The system comprises the following steps: designing an information collection framework based on C-V2X communication technique, and determining the type of mobile phone carriers by combining with a city intersection high-precision map; determining the probability that the carriers are pedestrians according to the current positions of the C-V2X terminal carriers in future; recognizing whether the C-V2X mobile phone carriers are pedestrians according to the current speed information of the C-V2X mobile phones; obtaining the density range when the C-V2X mobile phone carriers are pedestrians, and determining the probability that the C-V2X mobile phone carriers are pedestrians under the current density by combining with the density information around the C-V2X mobile phones; and representing directions by virtue of a domain method, dividing the regionin the range of the intersection into different regions, obtaining an advancing direction set when the C-V2X mobile phone carriers are pedestrians by virtue of the previous directions of the C-V2X mobile phones, influence factors of the pedestrians to the directions and influence factors of the positions to the directions, calculating the probability that the C-V2X mobile phone carriers in advancing directions are pedestrians by combining the actual C-V2X mobile directions.

The invention discloses a determination method for a minimum chamfer value of red lines of a road intersection. The determination method comprises the following steps: determining a right-angle vertex A of a sight distance triangle; calculating safe parking sight distances of a first straight movement motor vehicle lane which is closest to the central line on a right side transverse road, and a straight movement motor vehicle lane which is closest to the right side of a vertical road, and rounding up calculating results up to integers to obtain safe parking sight distances adopted values S1 and S2 of the two motor vehicle lanes; constructing the sight distance triangle; calculating the minimum chamfer value of a direction red line of the intersection; and taking the maximum value of the four directions as the minimum chamfer value of the whole intersection red line. According to the determination method, the minimum chamfer value of the red lines of the sight distance triangle is utilized for making up of the vacancy of a specific evaluation method of the red line chamfer by existing specifications; and the intersection occupied area can be reasonably planned under the condition of guaranteeing the safety, and the utilization efficiency of urban road land resources is improved.

The invention discloses an intelligent signal light control method and system based on HydraCNN. The method comprises the steps of collecting a traffic flow image of a road intersection in real time, and analyzing the quantity of vehicles in the traffic flow image based on a HydraCNN model; and acquiring the quantity of the vehicles at the current intersection and the entering flow entering the current intersection from an adjacent intersection on a collected traffic flow image data set, and inputting the parameters into a trained linear regression model, thus allowing the model to be able to return the overall green light time needed by the passage of the vehicles at the current intersection. According to the method and system provided by the invention, the artificial intelligence technology is applied to intelligent control of the traffic signal light at the intersection, the traffic flow images are collected in real time at the road intersection, intelligent coordination of the signal light groups at the multiple intersections is achieved through analyzing the vehicle congestion condition by the system, and setting the best red light time and green light time, and thus the traffic capacities of the intersections are improved while the traffic safety is ensured, and the extremely positive effect is achieved for solving the traffic congestion phenomenon of the modern cities.

A drive unit inputs an electrical signal to the first and second vibrating members to generate, in a light-transmitting region of a dust-screening member, vibration forming peak ridges defining a closed curve around a first virtual intersection of an virtual symmetry axis at the same distance from the first and second vibrating members and a vibrational axis for both first and second vibrating members, the vibration gradually increasing as the amplitude of each vibrational peak approaches the first virtual intersection, and having a maximum amplitude at the vibrational peak including the first virtual intersection. The drive unit controls the electrical signal to move the vibrational axes of the first and second vibrating members on the virtual symmetry axis and to change the first virtual intersection to a second virtual intersection and moving a vibrational peak of maximum vibrational amplitude to a position including the second virtual intersection.

The invention provides a traffic signal time assignment method based on collaborative optimization. The relevance between intersections is determined according to actual distribution of comprehensivesignal lamps and traffic flow, a signal collaborative control area based on SCAN cluster partition is determined, connected intersections with stronger relevance are gathered in the same cluster, andby means of a Boltzmann selection strategy, adaptive collaborative control is performed after regional learning intellectual bodies are subjected to sufficient experience accumulation until the signalcontrol ends, and passing rate of vehicles in a small-area range is increased, so that the traffic efficiency of the overall road network is improved.

The invention discloses a scan intersection-based underground cable three-dimensional locating device and a locating method. The scan intersection-based underground cable three-dimensional locating device comprises two magnetic field detection modules, a GPS (Global Positioning System) positioning module, an air pressure measurement module, a biaxial dip angle measurement module, an electronic compass and a control module, wherein all the modules are arranged on a detection platform. By utilizing the scan intersection-based underground cable three-dimensional locating device disclosed by the invention, a space magnetic field around an underground cable can be firstly scanned through the magnetic field detection modules, orientation angles of the magnetic field detection modules relative to the underground cable can be obtained according to a magnetic field distribution rule, and coordinates of the underground cable relative to the detection platform can be calculated through an intersection algorithm; secondly, data of longitude and latitude coordinates, the altitude, the space attitude, an azimuth angle and the like of the detection platform can be measured through all the measurement modules, and the longitude and latitude coordinates and the relative altitude of the underground cable in a current detection point can be calculated through coordinate transformation; finally, data storage and three-dimensional display can be carried out. According to the scan intersection-based underground cable three-dimensional locating device disclosed by the invention, buried depth data of the underground cable is represented by using the relative altitude, the influence of landform variation on measurement is overcome, the measurement accuracy is high, and the measurement efficiency is high.

The invention discloses a signal intersection assessing method based on an entropy weight method. The signal intersection assessing method based on the entropy weight method comprises the following steps of: obtaining intersection static information by a manual investigation method, and obtaining vehicle dynamic information by a video analysis method; calculating the saturation flow at the intersection entrance lane, the intersection saturation at the intersection signal period, the intersection delay at the intersection signal period, and the intersection queue length at the intersection signal period; and calculating a comprehensive score of the intersection, and assessing the service level of the intersection based on the comprehensive score of the intersection. The signal intersectionassessing method based on the entropy weight method uses intersection traffic data and the entropy weight method to scientifically and reasonably assess the service state of the signal intersection, and improves the accuracy and timeliness of the assessing result.

The invention provides a traffic simulation control method and a traffic simulation control device. The traffic simulation control method includes acquiring vehicle flow of first intersections; acquiring vehicle flow change of second intersections related to the first intersections; acquiring first influence degrees of the vehicle flow change of the second intersections on the vehicle flow of thefirst intersections according to the vehicle flow change of the second intersections; judging that congestion is about to occur at the first intersections when the first influence degrees are higher than first preset thresholds. The traffic simulation control method and the traffic simulation control device have the advantages that the technical problem of deficiency of advanced warning and timelyguidance during traffic paralysis due to vehicle flow over-saturation in the prior art can be solved by the aid of the traffic simulation control method and the traffic simulation control device; technical effects of clearly assisting in analyzing and predicting traffic congestion sections and reasons, timely adopting corresponding measures, carrying out advanced warning for congested sections and quickly carrying out traffic guidance to guarantee normal road driving can be realized.

The invention discloses a design method of an aerial overpass structure. The design method includes: needing to use the number of flight levels; updating traffic flow data; calculating complexity as well as collision risk values and graded index values of aerial intersection; judging which route requires a new aerial overpass; calculating the operation distance of the aerial overpass; calculatingbridge radius of adjacent aerial intersections and judging whether the route distance S2 between the aerial intersection and the adjacent aerial intersections is smaller than L'1+Lp+L1 or not and thelike. The design method has the advantages that the problem about which route to construct the aerial overpass and how many flight levels need to construct when an aircraft enters or leaves the aerialintersections can be solved; for the aircraft 'entering' the aerial intersection direction, the fact whether or not the distance from a section or a zone boundary is sufficient for the aircraft to change attitude once can be extended to the fact whether or not the route distance between the two neighboring aerial intersections can meet the minimum change in attitude; therefore, a basis is provided for the principle of coordinate distribution at the flight levels, and reference is provided for regulatory authorities to sign relevant agreements.

The invention discloses a traffic low-emission evolution regulation and control method and system, and the method comprises the steps: a virtual intersection corresponding to a real intersection is built for intersections with different geometrical shapes and topological structures, wherein the optimization of the low-emission signal control scheme of the traffic is realized based on a microscopicsimulation platform, so that the risk caused by an unreasonable signal scheme is reduced; due to the fact that optimization of the evolution control scheme takes vehicle average delay and traffic emission as comprehensive indexes, multi-objective optimization is achieved, the vehicle average delay and emission can be remarkably reduced after multiple times of learning, and the traffic capacity ofthe intersection is improved. Besides, the system of the invention learns a traffic low-emission optimization control scheme through interaction with the environment, solves the problem that accuratemathematical modeling is difficult to carry out, and is better suitable for different intersections and traffic flow conditions.

The invention relates to the technical field of ancillary facilities for road traffic, in particular to a multi-color pavement guidance system for circular intersections. The multi-color pavement guidance system for the circular intersections has the advantages that pavement way-directing information is enriched, surplus and unnecessary signs are reduced, visual environment monotone is reduced, an mental rotation effect of a driver is reduced, the visual fatigue of the driver is relieved, thereby realizing coordination of social benefit and economic benefit of pavement guidance induction information of the circular intersections and guaranteeing road traffic safety.

The invention relates to a method for monitoring the control state of the bottleneck. The method comprises steps of: obtaining data of all of the intersections in the bottleneck control sub-area and adjacent intersections; selecting an intersection as a central intersection, and then displaying an interface, which comprises the intersection and other five intersections in the east, west, south andnorth, in a graphical form, wherein each intersection contains four directions of east, west, south, and north; displaying the phase lamp state in real-time, a phase flow, the release time of the phase in one cycle, the change amount of the release time of the phase in the cycle and the upper cycle, the occupancy rate of the road segment detector, and the occupancy rate of the overflow detector on the graphical intersection; controlling the phase release of the upstream and downstream intersections by modifying thresholds, according to the values of the occupancy rate of the road segment detector and the occupancy rate of the overflow detector. According to the method for monitoring the control state of the bottleneck, the method is easy to realize, is high in efficiency, is rich in display data, is capable of controlling the release state of the intersections, integrates the display and the control, and can be integrated into an actual road traffic control system.

An integrated modeling method for infrared radiation characteristics of complex targets, based on the radiometric spectrum ray tracing method, considering the complex target surface's own infrared radiation, the bidirectional reflectance distribution function model, and the infrared radiation model of non-uniform exhaust gas; ray tracing The process adopts sampling the pixels of the focal plane of the detector to generate a ray beam, and calculates the intersection of each ray with the complex target in the scene; calculates the radiation reflection value for each intersection point, and calculates the radiance obtained by all the rays of the pixel Sampling and reconstruction to obtain the spectral radiance at the pixel of the detector; finally, integrate the required infrared spectrum to obtain the characteristic value of the target infrared radiation received by the detector. The present invention runs through the whole solution process with a spectral ray tracing method, and establishes a solution model applicable to the ray tracing form, which is suitable for simulating the infrared radiation characteristics of complex target aircraft including tail flames in a specific flight state.