151 results about "Track geometry" patented technology

Novel tools and techniques for monitoring railway track geometry. In one aspect, some such tools and techniques can determine a location of a platform along a railway, capture one or more images of the railway, and/or analyze the rail configuration at that point. In another aspect, some solutions might employ photogrammetric techniques to analyze the rail configuration and thereafter store data about the rail configuration, perhaps correlated with the location of the images, in a data store.

Techniques are disclosed for detecting and reporting railroad track anomalies. In one embodiment, a track inspection application is configured to receive images (or other sensor data) depicting a railroad track captured by cameras mounted on a train, compare the captured images with corresponding reference images (or other sensor data) captured from substantially the same locations and vantage points, and detect anomalies in the railroad track represented by differences between the captured images and corresponding reference images. In another embodiment, the inspection application may generate a three-dimensional (3D) model of the railroad track based on depths determined through, e.g., triangulation, and determine the railroad track's geometry from the 3D model. The inspection application may then detect anomalies associated with the track geometry, such as an incorrect distance between track rails or an incorrect overall location of the track, based on differences between the determined track geometry and a stored track geometry.

The invention discloses a track center line automatic detection method based on vehicle-mounted mobile laser point cloud. The method comprises the following steps: S1, point cloud segmentation of a roadbed and a track; s2, track point cloud classification; s3, automatic track center line detection: according to a cross section design drawing of a standard steel rail, automatically reconstructing astandard three-dimensional geometric model of the steel rail in a segmented manner, carrying out iterative registration on the standard steel rail model and the segmented steel rail point cloud in the S2, and carrying out automatic reconstruction on a segmented three-dimensional model of the steel rail; calculating track geometric parameters by utilizing the reconstructed track three-dimensionalgeometric model, calculating track center line point locations in a segmented manner on the basis of the reference track, and sequentially connecting the track center line point locations extracted inthe segmented manner to form a line center line. According to the method, roadbed and rail point clouds can be rapidly segmented, the area of rail point cloud classification search is reduced, automatic classification of laser point clouds on the surfaces of left and right steel rails is realized, and the precision requirement of existing rail transit midline detection can be met.

A method and device for determining at least a first parameter of a track. The method includes providing a first track geometry quality data associated to at least one point along a rail at a first temperature, providing a second track geometry quality data associated to at least one point at a second temperature, and describing a difference between the first and second track geometry quality data using a model. The model relates the first and second track geometry quality data with associated temperatures to stress free temperature and/or track resistance, and estimates the stress free temperature and/or track resistance in at least one point based on the model.

A camera measuring method of long-straight track geometric parameter belongs to digital camera measuring and digital image disposing technique of railway contribution. It is: fix cooperate symbol on circuit detecting vehicle head moving on long-straight track, install camera before the vehicle. When vehicle moving along the track, at least two images at different time of the symbol moving as track waving and deflecting are shoot. Achieve geometric parameter (at least one of gage, cant, longitudinal deviation and versed sine) of the track by image processing. The invention efficiently meets high-speed railway requirements of high precision, reliability and automatic degree detecting, greatly improves geometric parameter level of track, which can be applied directly in geometric parameter detecting system of tamping vehicle and be as a core to design multiform track detecting vehicles.

The invention discloses a railway track gauge and horizontal parameter measuring method based on vehicle-mounted Lidar point cloud. The method includes the following steps that S1, a track model is established; S2, the track model and the vehicle-mounted Lidar track point cloud are initially matched; S3, the track model and the vehicle-mounted Lidar track point cloud are precisely matched, the distances from left and right working edges and an upper tread surface of the steel track model to the corresponding vehicle-mounted Lidar point cloud are calculated separately, and the gauge is adjustedaccording to the distances from the working edges of the steel track model to the vehicle-mounted Lidar point cloud; and S4, the step S3 is repeated iteratively until the distances from the working edges and the upper tread surface of the steel track model to the vehicle-mounted Lidar point cloud are smaller than a preset threshold value. The method realizes high-precision measurement of geometric parameters of a railway track, realizes matching of the track model considering the gauge and horizontal parameters with the vehicle-mounted Lidar track point cloud, and the gauge and the horizontalparameters of a railway track are measured based on the track model, so that technical support is provided for railway track measurement by using the vehicle-mounted Lidar technology.

The invention provides a detection method and device of a track regularity state. The track irregularity is measured through a preset chord measuring method, and the chord measuring value corresponding to the preset measuring position is obtained; according to the incidence relation of the chord measuring value and the track irregularity, a mathematical model between the chord measuring value and the track irregularity is established; back calculation computing is carried out on the chord measuring value according to the mathematical model, and the track geometric shape and location are obtained; and filtering is carried out on the track geometry, and the track irregularity is output. The mathematical model between the track irregularity and the chord measuring value is established again, and the chord measuring value serves as a state quantity for the track irregularity. Back calculation is carried out on the track irregularity through the state quantity. By means of the method, a transfer function can be basically stabilized within 1+/-0.2, the track irregularity can be measured more accurately, and the principle of least squares is involved in a one-chord and multi-point chord measuring method. The track irregularity is corrected through the multi-point measuring value, and the measuring precision and the measuring resolution ratio of the detection method and device are improved.

The invention discloses a detection method for track geometric irregularity based on a two-dimensional laser displacement sensor. A left laser sensor, a right laser sensor, a longitudinal inclinometer, a lateral inclination meter, a gyroscope, a lateral accelerometer, and a left vertical acceleration are installed on the detection beam. meter, right vertical accelerometer, the left laser sensor and the right laser sensor are two-dimensional laser sensors; perform the following measurements: track gauge detection, height detection, rail direction detection, horizontal superhigh detection, twist detection, curvature detection, Rail vertical as well as side wear measurements. The present invention adopts a high-speed two-dimensional laser displacement sensor, which has strong anti-interference ability. Based on the two-dimensional sensor, there is no complicated image processing step, and with simple and effective back-end algorithm processing, it has higher detection and calculation speed. It can effectively eliminate the influence of vehicle body vibration on the detection result, the detection result has high repeatability, can compensate the detection result, and has higher detection accuracy.

The invention provides a vehicle and a method for detecting geometric parameters of tracks. The vehicle and the method are used for detecting data of the grooved tracks. The vehicle and the method have the advantages that laser displacement sensors, acceleration sensors, gyroscope sensors and the like are arranged on the vehicle for detecting the geometric parameters of the tracks, errors in sampled data of the laser displacement sensors due to inclination of a vehicle body can be corrected by a processor, accordingly, corrected data can be obtained, and actual geometric parameter data of the tracks can be generated by the processor by the aid of the corrected data and detection data acquired by the gyroscope sensors and the acceleration sensors; the data of the grooved tracks can be detected by the aid of the vehicle and method for detecting the geometric parameters of the tracks, and the generated geometric parameter data are high in accuracy by means of error correction.

A method for measuring geometric parameters of a track by adopting a camera comprises the following steps: a measuring vehicle is placed on the track to be measured; a camera device is fixedly installed on one end inside the measuring vehicle; an optical axis of the camera device is in parallel with the plane of the bottom of the measuring vehicle; two sign posts are arranged on the track at the other end inside the measuring vehicle and are respectively perpendicular to the two sides of the plane of the bottom of the measuring vehicle; the two sign posts are at different heights and at the distance of r; a cooperation sign is arranged at the top end of each sign post; the sign posts can only move in the direction perpendicular to the plane of the bottom of the vehicle and in the transversal direction; a wheel at the bottom of the sing post moves, and is tightly attached to the inner side of a steel track; when the measuring vehicle moves on the track to be measured, the camera device is utilized to capture images of the cooperation signs at different time; and the images is processed through image processing and data processing on a real-time basis so as to acquire the geometric parameters of the track. The method meets the requirements of modern track construction and development, satisfies the requirements of high precision, high reliability and high automatic degree detection, and has good application prospect in the railroad engineering field.

The invention relates to a high-speed railway track accurate adjusting device comprising a base (1) and a measuring device. The high-speed railway track accurate adjusting device is characterized by also comprising a vertical post (2) and an elastic pressing device, the measuring device is a prism (3), the geometric center of the base (1) and the reflecting center of the prism (3) are both positioned on the axis of the vertical post (2), and the elastic pressing device is positioned on the base (1). When a track is accurately adjusted, the three-dimensional coordinate of the prism (3) is measured in real time by a measuring robot controlled by software and a track plate is adjusted through an accurate adjuster so that the geometric position of the track using the rail top of a steel rail as a reference is accurately adjusted to the designed position. The invention has the advantages of convenient installation, simple manufacturing, low manufacturing cost and no need of polishing the track plate; and when the track is accurately adjusted, a steel rail simulating device is measured in real time by the measuring robot controlled by software so that the geometric position of the track is accurately adjusted to the designed position.

The invention discloses a high-speed railway track segmented measurement data smooth connecting method. In the high-speed railway track measurement process, a track geometry measuring instrument carries out positioning and orientation to total stations according to CPIII networks, then a dolly prism is measured, and data of a track gauge and a horizon sensor are integrated to obtain the coordinate and elevation of each track measuring point. The CPIII networks are arranged in pair, and the distance between any two adjacent pairs of the CPIII networks is in a range of 50m to 70m, and the total stations are arranged at an interval being in a range of 50m to 70m during the track measurement process. In order to guarantee the continuity of the track measuring points, the total stations in adjacent measuring stations need to measure track points of 6-10 sleepers in an overlapped, and the measuring results of each track point in two times are not consistent. In order to eliminate the discrepancy, the track measurement data smooth connecting method is provided to adjust the measuring results of the measured track points in each measuring station comprising the overlap region, the smooth connection of coordinate and elevation data, of track measuring points, which are measured during the pavement, maintenance and detection processes of the high-speed railway track in a segmented manner is achieved, and the precision of the measuring results is improved.

A railroad track monitoring system is described which detects changes in rail track geometry that could lead to derailments, The changes in geometry are detected via analysis of temperature and stress parameters that are collected at one or more sensors installed on the track. Methods are described which provide faster detection and reduced false alerts, thereby saving time and expense to the railroad system.

The invention discloses a method for fully automatically and accurately monitoring changes of geometric parameters of a track. The method comprises the following steps: arranging each of pairs of track monitoring points (10) on the track (1) with a certain spacing distance; transmitting the data of geometric parameter changes of the track, collected from the monitoring points, to an indoor control machine through a horizontal displacement sensor (4) and a vertical displacement sensor (5); displaying the parameter changes of the track in the form of a real-time deformation curve diagram on a screen through data acquisition and processing software, and automatically storing the collected data in a database. Compared with the conventional track detection method, the method disclosed by the invention achieves the purpose of unmanned and full-automatic monitoring of railroad track parameters, prevents workers from performing measurement on the track frequently to reduce the potential personal safety hazard and eliminate the occurrence of safety accidents, has the advantages of all-weather operation, full-automatic operation, high intelligent level and high precision, improves the railroad construction environment and line monitoring level, reduces the labor intensity, increases the work efficiency, and achieves the effect of remotely monitoring the changes of geometric parameters of railroad tracks.

The invention relates to a real-time monitoring method and system of high-speed railway track geometry. The system includes a plurality of prisms, and each prism is arranged on the waist of the trackaccording to a certain interval; a data acquisition unit which is arranged outside the driving area, and the data acquisition unit is used for launching electromagnetic wave by scanning to the prismsarranged on the waist of the track, then the electromagnetic wave reflected by the prisms is received to obtain the real-time spatial coordinates of each prism; a data processing unit which is connected with the data output end of the data acquisition unit, and the data processing unit is used for obtaining the real-time spatial coordinates obtained from the data acquisition unit, then current geometric state parameters of the track are obtained by the specific algorithm in this paper according to the real-time spatial coordinates and the initial space coordinate of the prisms. The real-time automatic monitoring system for the track geometry based on an automatic total station is established through arranging the appropriative prisms on the track to ensure the operation safety of the high-speed railway.

The invention relates to a construction technology of a heavy haul railway, specifically relates to a construction method of ballastless tracks of a tunnel group of a heavy haul railway. According tothe characteristics of high requirement on the construction precision of a ballastless track bed and difficulty in control in the construction of the ballastless tracks, the principle of near laying and convenience in precision control is adopted; a double-block sleeper is hung and placed to a position to be laid near a construction track bed plate; after key processes of steel bar binding, trackpanel assembly, comprehensive grounding, track coarse adjustment and the like are carried out, the geometric dimension of the tracks is finely adjusted by using a track inspection trolley measuring system, so that the design precision requirement is met, and finally, the track bed concrete is poured for one-step forming. The technology has the characteristics of being simple and convenient to operate, safe, practical, accurate in track geometric dimension, quick to position and the like.

The invention relates to the technical field of rail construction, in particular to a metro depot reserved stand column inspection pit rail construction method. The method comprises the following steps: 1) concrete of a 500 mm reserved stand column below a rail surface is drilled away; 2) a steel rail fixed support frame and an symmetric inclined pull device are adopted to fix a steel rail on the stand column; a buckle is mounted according to the position of the stand column corresponding to the steel rail; and the rail row assembly and the steel rail connection are performed; c) the steel rail fixed support frame is used for geometric size adjustment and precision control of rail cant, gauge, direction, levelness and elevation rail states; and d) the concrete is cast after a reserved stand column temperature is mounted. The reserved stand column inspection pit rail construction adopts the self-made steel rail support frame and the symmetric inclined pull device to preferably fix the steel rail to guarantee geometric size adjustment and precision control of rail cant, gauge, direction, levelness and elevation so as to meet the design and specification requirements. The reserved stand column inspection pit rail construction method is simple, convenient in operation by constructors, economical and reasonable, and saves the cost.

The invention discloses a two-dimensional holographic visualization system and a method of a high-speed comprehensive detecting train, and belongs to the field of train information presentation. The invention provides a holographic information presentation system and the method of the high-speed comprehensive detecting train. According to the system and the method, methods of integrating multi-dimensional data and jointly displaying and the like are adopted based on a geographic information technology, a video technology, a picture and a two-dimensional technology, thus, means are provided for displaying real-time data with various types. The invention have the beneficial effects that the method and the system of holographic information presentation are provided for the comprehensive detecting train; detecting data in four professions, including track geometry, a wheel-rail force, a traction power supply and communication signals and the like can be integrated to a holographic displaying platform through geographic space data; and the basis is provided for real-time online analysis, correlation alarming and fault diagnosis of the detecting data, thereby solving problems that detecting systems in various professionals are separated and the data can not be shared.

The invention relates to a track geometric parameter measurement car applied in the field of track measurement of railway locomotive vehicles, which comprises a car body, a chassis, a power system, a control system, a measurement system and an electrical control system, wherein the car body is positioned on the chassis, comprises a cab and a seat and a control console therein, and is used for leading an operator to drive the car and operate a car-mounted measurement instrument; the chassis is positioned at the bottom of the car body and plays the role of transferring traction force, braking force and action force of a working mechanism; the power system uses a battery as a power source and a takes a mechanical transmission device as a transmission mechanism; the control system is used for electrical control of the whole car; and the measurement system comprises an optical measurement device and is used for high-precision measurement of parameters of a track. The novel track geometry measurement car has the advantages of low labor intensity, high working efficiency, improved working environment, more interfaces for loading and measuring instruments, stable and reliable work and the like, and the self-power can realize independent manipulation and driving, thereby meeting the leading measurement of the geometric parameters of the track in large road maintenance mechanical operation by high efficiency.

The invention relates to a method and a device for establishing a wheel/rail force load identification characteristic data model, wherein, the method comprises the following steps of: extracting time-frequency characteristics of track-vehicle system detection data by using an adaptive signal decomposition algorithm based on a variable parameter domain and a short-time Gaussian chirplet; fusing thetime-frequency characteristics of track-vehicle system detection data by using a multi-node collaborative conjugate sparse principal component analysis algorithm; and establishing a wheel/rail forceload identification characteristic data model by taking multi-node characteristic fusion data as a sample data set and using an L1/2-SparsePCA-ELM neural network machine learning algorithm. The technical scheme uses the data modeling method to identify the wheel/rail force in real time, then evaluates the safety status of track-vehicle system interaction, and is an important supplement to the existing track quality evaluation standard based on track geometry state detection, which is conducive to the comprehensive analysis of the track-vehicle system status and guidance of high-speed railway track maintenance work.

The invention relates to a measuring device for calibrating a high-speed railway track measuring instrument. The smoothness detection on a railway track mostly adopts a mode of using a track geometrical state measuring instrument, and after the long-period use, the measuring precision can be reduced, so that a standard calibrating device is needed for carrying out timed and regular calibration on the measuring instrument. The measuring device comprises a welding base, a superelevation calibrating module, a casting structure crossbeam and a track gauge calibrating module from bottom to top, wherein the casting structure crossbeam is vertical to the alignment, the superelevation calibrating module determines the moving of the casting structure crossbeam through reading the radian block rotation distance, and the track gauge calibrating module can calibrate the alignment, the height and the track gauge. The measuring device has the advantages that the alignment, the track gauge, the height and the superelevation of the track measuring instrument can realize the timed and regular calibration, the structure is reasonable, the operation is simple, the measurement errors of the track measuring instrument due to the long-period use in the field operation process are avoided, and the measurement accuracy of the track measuring instrument is improved.