957results about "Measuring apparatus" patented technology

The invention discloses a track irregularity detecting system and method based on an INS/GNSS. According to the method, an INS/GNSS combined measurement system is taken as a core measurement device, is fixed and arranged on a moving support and moves along with the moving support on a track, and a three-dimensional position coordinate sequence of the track and an attitude angle sequence of the track are obtained through measurement. Track irregularity is evaluated through a track irregularity evaluation method based on the coordinate method according to the combination of tack design curve parameters, the three-dimensional position coordinate sequence of the track, the attitude angle sequence of the track and a gauge measured value. According to the track irregularity detecting system and method, high-accuracy and high-efficiency dynamic measurement of the track irregularity is achieved, the track irregularity is evaluated on the basis of the coordinate method, and the evaluation method is simpler and more convenient to conduct, intuitive and easy to understand.

A rail sensing and analysis system utilizes a laser sensor 105, 107 to detect displacement of a rail 102, 104 resulting from loads imposed by a passing rail vehicle. Vertical and/or lateral displacements/loads may be sensed. Signatures in the resulting signals are indicative of useful information about the rail vehicle; such as wheel condition, bearing condition, truck condition, degree of bogie hunting, total load, load distribution, etc. The ratio of Lateral over Vertical force (L/V) may be used as an evaluation criterion.

Method for determining structural parameters of a railway track having a sensor array, includes measuring vertical and/or lateral irregularities of the rail with the sensor array along the rail, thereby providing signals corresponding to geometrical irregularities at different distance from the wheel-load. A model is provided describing the rail's deflection shape, which is dependent on structural parameters of the rail and on the loads on the rail. The model is stored in a processor where geometrical irregularities are compared under different load influence for generating a measured deflection shape. At least one theoretical rail deflection shape is generated using the model by varying structural parameters and the load in the model. At least one of theoretical deflection shapes is compared with the measured deflection shape for each point of the rail, and the structural parameters of that theoretical deflection shape which best matches the measured deflection shape are determined.

The invention discloses a system for kinetic model test of the ballastless track subgrade of a high-speed railway. The system comprises a model test box, a model of the ballastless track subgrade of the high-speed railway, an excitation system and a monitoring system, wherein the model of the ballastless track subgrade of the high-speed railway is formed by the foundation, a foundation bed bottom layer, a foundation bed surface layer, a concrete base, CA (cement asphalt) mortar, a track plate, a fastener system and a steel rail in sequence; the excitation system comprises a series of vibration exciters; simulation of train loads at different running speeds is realized by cooperatively controlling the vibration excitation frequency and phase of each vibration exciter; and dynamic earth pressure sensors and layered settlement gauges are arranged in the model of the subgrade, steel strain gauges are embedded in the concrete base and displacement and acceleration sensors are arranged on the track structure to jointly form the monitoring system of the system. The system can be used for carrying out study on the kinetic model test of the subgrade under the running load of the train and can evaluate and predict different foundation conditions, subgrade structures and track irregularity.

The invention relates to the field of precise engineering survey, in particular to a method for rapidly measuring a foundation pile control net (CPIII) of a rapid transit railway on the basis of movable laser radar measuring technology and high-speed digital imaging technology. control net (CPIII) measurement data is obtained by using a movable high-precision measurement system comprising a laser scanner (1), a GPS/IMU positioning and orientating system (2), a high-speed digital imaging system (3), an industrial computer (4) and a power supply device (5); and united weighted adjustment is carried out on advanced net data, united measured data and auxiliary measurement points extracted from images to obtain high-precision control net (CPIII) control point coordinates. The invention can greatly shorten the measurement time of the control net (CPIII), overcomes the defect of little total correlation of discrete single-point measurement, carries out integral adjustment on all control points, has good closing property and high relative precision, obtains plane and elevation coordinates of all control points, and greatly simplifies the measurement work of the control net (CPIII).

The invention discloses an existing railway line retesting method based on the on-board laser radar technology. Firstly, control marks are arranged along a railway to be tested at preset intervals; secondly, position coordinates of the center point of each control mark on a railway engineering coordinate system are measured; thirdly, laser point cloud data and image data of rails, railway equipment and facilitates (such as annunciators, turnouts and contact net rods), terrain around the railway and the control marks along the railway are obtained, and colors of the image data are assigned to corresponding laser point cloud data; fourthly, the obtained colorized laser point cloud data are subjected to precision refining treatment with the position coordinates of the control marks as reference points, so that errors in the colorized laser point cloud data are eliminated; fifthly, rail surface linear laser point data are extracted from the colorized laser point cloud data subjected to the precision refining treatment; and sixthly, the line type of the existing railway is restored through the rail surface linear laser point data. Information of the existing line is accurately obtained under the condition that operation of the railway is not influenced.

The invention belongs to a track parameter detection technology, and in particular relates to a method for efficiently measuring three-dimensional coordinates of a track based on a track precise control net, which comprises the steps of: setting a measuring interval on a track line, setting control pile points of the precise control net at two sides of the track line, installing an intelligent track detection vehicle and a track satellite vehicle on the track, wherein an operation frame of the intelligent track detection vehicle is provided with an automatic leveling platform and a total-station type electronic distance measuring device, and the track satellite vehicle is provided with a measuring prism; in each measuring interval, collimating the control pile points of the precise control net arranged at two sides of the track line by using an automatic collimating function of the total-station type electronic distance measuring device, statically intersecting and measuring three-dimensional coordinates of a measuring point of the total-station type electronic distance measuring device and coordinates of a starting point and an ending point of the track satellite vehicle in the measuring interval; and between the coordinates of the starting point and the ending point of the track satellite vehicle, tracking and measuring the track satellite vehicle by using the total-station type electronic distance measuring device and dynamically tracking the three-dimensional coordinates of the track line. The invention realizes measuring point option, eliminates a track control blind region, and has high operation efficiency by adopting a static intersection and dynamic tracking and measuring manner.

This invention relates to a portable pushing car for checking railway, with such geometric parameter as railway gage, cant, triangle pit, including mechanical structure in I-shaped and three-point framework, electric source, induction testing, controlling and displaying sections. The bearing bogie structure, closing structure, hand button rod, measuring mechanism, controlling system, electric source, displaying box and various sense organs are mounted on main beam crossed on two-railway, three rollers and their mechanism which is both bearing and bogie. On one side of closing mechanism there is position closing wheel, on the other side there is retractable pressure resistant wheel used to make king piece and railway erect, and close to the inside of the railway. This advantages are light weight, stability, slight shaking and corrosion resistance.

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.

The invention discloses a track parameter dynamic test car based on a combination of an inertial sensor and a navigational satellite. The track parameter dynamic test car based on the combination of the inertial sensor and the navigational satellite comprises a car body assembly, an inertial sensor assembly, a navigational satellite mobile station assembly, a navigational satellite base station assembly, a track distance measuring assembly, a speedometer assembly and a track test car control computer assembly. The track parameter dynamic test car based on the combination of the inertial sensor and the navigational satellite can automatically complete dynamic detection of nine track parameters such as height, track direction, distortion, level and superelevation, twist warps, plane degree, track distance, turn radius and mileage and the like after running on a track to be tested, achieves no-contact test, and achieves the highest test speed which is 60Kg/h. The track parameter dynamic test car based on the combination of the inertial sensor and the navigational satellite has the advantages of high and steady measurement accuracy, simple structure and easy operation, and is beneficial to generalize and use.

The invention provides a paving method of a CRTS I type plate type ballastless track slab in a severe cold region, which sequentially comprises the following steps of: building a roadbed and a CPIII control network, processing the surface of the roadbed, measuring during construction, constructing a base, constructing a convex baffling table, processing the surface layer of the base, paving a CA mortar pouring bag, paving a track slab, precisely adjusting the track slab, pouring CA mortar, arranging a resin pouring bag around the convex baffling table, pouring resin around the convex baffling table, and cleaning a work surface. The step of precisely adjusting a track slab adopts a prism frame method. The prism frame method comprises the following steps of: arranging two measuring frames at positions of screw bolt holes at the two ends of each track slab after building a CPIII control point; measuring a spherical prism on the frame after freely stationing a total station, wherein measured data represents a practical three dimensional coordinate of the track slab; counting the difference value between a theoretic three dimensional coordinate value and a practically-measured three dimensional coordinate value; precisely adjusting the track slab with a bidirectional adjustor untill that the difference value meets the criterion requirement. The CRTS I type plate type ballastless track slab which is paved with the method can meet the characteristic of the climate in the severe cold region.

The invention provides an automatic state detection device and method for a railway track spring bar fastener. The device comprises a travelling mechanism; a travelling control mechanism is connected to the travelling mechanism; a spring bar fastener distance measurement module, an image acquisition module, a spring bar fastener surface three-dimensional point cloud acquisition module, and a data processing and judging module are fixedly mounted on the travelling mechanism; the spring bar fastener surface three-dimensional point cloud acquisition module is used for acquiring integral three-dimensional point cloud data of the spring bar fastener; the travelling control mechanism comprises a wireless receiver, a microprocessor and a driving motor; the data processing and judging module is used for determining the edge of a fastener in a spring bar fastener plane image based on the three-dimensional point cloud data and image data, extracting the image of the spring bar fastener, and judging whether a crack exists on the spring bar fastener according to the extracted image of the spring bar fastener. According to the automatic state detection device and method, whether the crack exists on the spring bar fastener or not can be detected automatically.

In a rail track system having transition points, a locomotive having a navigation system (such as a combined inertial/GPS location system) moves along an initially known track and enters the “halo” surrounding a track transition to begin data collection/logging to accumulate successive position information data points as the locomotive moves into, progresses through, and exits the “halo.” The collected data for movement within the “halo” is then subject to a best fit assessment relative to the data pre-stored in the track database.

The invention discloses a device for monitoring a state of a ballastless track structure through fibber bragg grating sensing, which comprises M fibber bragg grating steel rail temperature and stress combined sensors, N fibber bragg grating steel rail horizontal displacement, longitudinal displacement and vertical displacement combined sensors, P fibber bragg grating steel rail horizontal acceleration, longitudinal acceleration and vertical acceleration combined sensors, Q fibber bragg grating plate type ballast horizontal displacement, longitudinal displacement and vertical displacement combined sensors, R fibber bragg grating plate type ballast horizontal acceleration, longitudinal acceleration and vertical acceleration combined sensors, a multi-channel fibber bragg grating wavelength demodulator, a data processing terminal and an alarm device. The combined sensors are arranged at state monitoring points of the ballastless track structure of a rapid transit railway, and are directly contacted with the steel rail, the ballast and a base or are fixed by a supporting layer, wavelength output signals of various sensors are respectively transmitted to the demodulator through a transmission fiber and then are transmitted to the real-time data processing terminal and the alarm device, and if an abnormal state is monitored, the alarm device is started for early warning.

The invention discloses a moving load analog loading method and device for a rail transit wheel axle. A plurality of actuators are distributed above sleepers along a rail direction, the bottom of each actuator is connected in the span middle of a distribution girder, the bottoms of two ends of the distribution girder are arranged above steel rails at two sides, two continuous steel rails are laid on the sleepers and are respectively cut into mutually independent sectional steel rails above the positions of the sleepers, and each pair of sectional steel rail and sleeper is connected by a fastening system. Vertical pressure and upward pulling force are applied on the actuators by an anti-drop external member. A stress load time travel curve of a single fastening system under the effect of the wheel axle moving at different moving speeds is determined according to a train-rail-roadbed theoretical model and is used as a load exciting curve of each actuator, and the adjacent actuators are dynamically excited sequentially in the same time interval along the moving direction of the wheel axle so as to realize the analog loading of the moving load of the wheel axle at different speeds. The invention provides a reliable and convenient loading platform for developing a rail traffic dynamic model test research.

The invention discloses a transverse track irregularity detecting method based on an observer, which belongs to the technical field of track dynamic detection. The method comprises the following steps of: first, mounting a transverse acceleration sensor, a yaw angle measuring instrument or a gyroscope at the center of a bogie, so as to respectively measure transverse acceleration and yaw angular speed of the bogie in the train operation process; meanwhile, mounting a transverse acceleration sensor at the center of a train body bottom plate so as to obtain a train body transverse acceleration; and then carrying out relevant pre-processing, such as isolation, analogue-to-digital conversion, digital filtering and the like, on an analogue signal collected by a sensing device; and carrying out dynamics modeling on a train transverse suspension system by using the data to construct a transverse track irregularity estimating system, so as to detect the transverse track irregularity. The transverse track irregularity detecting method based on the observer, disclosed by the invention, belongs to an in-transit detecting method and has the advantages of stronger detection timeliness, simple structure of a detecting unit, uneasiness for being interfered by outside factors, high device reliability and low cost.