15 results about "Curve line" patented technology

The invention belongs to the technical field of reservoir dam line design, and provides an automatic determining method and system for a dam site of a whole-reservoir anti-seepage pumped storage reservoir. The method comprises the following steps: S1, extracting a contour line of a terrain curved surface corresponding to the elevation of a hydropower station; s2, selecting a contour line with the largest enclosed area range; s3, generating a convex hull for the selected contour line; s4, poles of the convex hulls are connected into a plurality of straight line sections li, the poles cut off the contour line into a plurality of curved line sections pli, and i closed areas are defined by the straight line sections li and the curved line sections pli; s5, selecting a closed area of which the volume is greater than a preset value V; s6, traversing a point j on the curve segment pli, drawing a vertical line nj from the point j to the straight line segment li, calculating the length hj of the vertical line nj, obtaining the length hijmax of the longest vertical line of each closed area, and calculating the ratio k of the hijmax to the straight line segment li; s7, setting a threshold value a, and selecting kgt; a closed area of a is used as a selected dam address. The method can accurately select sites, reduces man-made interference, and is suitable for various terrain environments.

The invention relates to the technical field of stress analysis wire harness shaping, in particular to a high-speed wire harness self-adaptive shaping method and system based on stress analysis, and the method comprises the steps: obtaining the wire harness tensile strength of a to-be-shaped high-speed wire harness, carrying out the preliminary shaping path construction operation of the to-be-shaped high-speed wire harness, and obtaining a preliminary shaping path; sequentially extracting shaping line segments from the preliminary shaping path, if the extracted shaping line segments are linear path segments, determining qualified linear wire harness segments, and if the extracted shaping line segments are curve path segments, performing curve segment shaping on the curve wire harness segments to obtain curve wire harness segments; and the bending outer side tensile stress and the bending inner side tensile stress of the curve wire harness sections subjected to curve section shaping are monitored in real time, self-adaptive shaping operation is performed on the curve wire harness sections to obtain qualified curve wire harness sections, qualified straight wire harness sections and the qualified curve wire harness sections are gathered, and a qualified straight wire harness section set and a qualified curve wire harness section set are obtained. According to the invention, the automation level and stress controllability of high-speed wire harness shaping can be improved.

This invention discloses a method, apparatus, and medium for fitting measurement point data based on master point data, belonging to the field of data point fitting. The method involves: acquiring a master point dataset and a measurement point dataset. The master point dataset is a set of master point line elements from tunnel design data, composed of circular curve line elements and straight line elements. The measurement point dataset is a set of points converted from tunnel cross-section points measured by a surveying robot to tunnel coordinates. Outliers within the measurement point dataset are identified; outliers are data points whose over- or under-excavation values ​​do not meet corresponding thresholds. Based on the line segment type of the master point line elements in the master point dataset, the outliers in the measurement point dataset are optimized to obtain an optimized dataset, and the optimized dataset is fitted to obtain an optimized curve. This invention optimizes measurement point outliers based on the master point dataset of tunnel design data, resulting in a fitting result that better reflects the actual engineering conditions, effectively reducing subsequent fitting errors and significantly improving the accuracy of the fitted curve.

The invention discloses a curve line passing speed intelligent regulation and control method based on the long-term service state of an urban rail vehicle. The method comprises the following steps that S1, an urban rail vehicle dynamics simulation model based on vehicle-line coupling is established; s2, verifying the feasibility and accuracy of the model through a vehicle dynamic performance test; s3, after the model is verified, establishing different working conditions based on different parameters to simulate a real operation environment so as to research the line condition of the curve and the mapping relation between the centrifugal acceleration and the speed curve; and S4, determining a centrifugal acceleration threshold. Compared with an existing traditional metro vehicle operation strategy, according to the curve line passing speed intelligent regulation and control method and system based on the urban rail vehicle long-term service state, the mapping relation between the centrifugal acceleration and the line condition and the vehicle operation speed is studied, the related threshold value is determined, and the curve line passing speed intelligent regulation and control method and system based on the urban rail vehicle long-term service state are obtained. And on the basis, a classification mechanism of centrifugal acceleration is determined, and a subway vehicle operation system with higher efficiency is constructed.

The invention relates to the technical field of railway line digitization, in particular to a railway line plane line shape digitization construction method, which comprises the following steps of: dividing a base line into a plurality of straight line elements and two continuous curve line elements connected between two adjacent straight line elements, and calculating the curve length and tangent length of the curve line elements; the calculated curve length and tangent length can be used for calculating the mileage, coordinates and tangent azimuth angle of the main point to obtain the corresponding relation between the coordinates of the main point and the mileage, and then the corresponding relation between other mileages and coordinates of the base line is calculated based on the main point to form the corresponding relation between all the mileages and coordinates of the base line; according to the method, the plane linear digital construction of the base line is completed, a two-line plane digital linear model can be constructed according to the base line, the line design is simpler, and the quality of the railway line design in China is improved.

The invention discloses a steel rail material for a subway small-radius curve line, and the rail head area of the cross section of a steel rail is divided into three areas according to different microsizes of pearlite structures, namely a surface regulation and control layer, a rail angle hardening area and a core base body area. Aiming at more small-radius curves of the subway line at present, the microstructure of different stressed parts of the steel rail head is reasonably designed and arranged on the basis of the wheel-rail contact relation and stress distribution characteristics of the small-radius curve line, so that the steel rail material rail head is ensured to have the wear and the surface contact fatigue crack cooperative control, and meanwhile, the steel rail material rail head is ensured to have a good anti-fatigue effect. And the generation and development of internal fatigue cracks can be reduced. Meanwhile, gradient distribution and stable control of pearlite structures of different parts of the rail head of the steel rail are achieved by controlling rolling and conducting accelerated cooling at different speeds on the rail head, and generation and development of steel rail abrasion and rolling contact fatigue damage on a small-radius curve line are effectively relieved; the comprehensive use performance and the service life of the steel rail are improved.

The application discloses a train wheel flange lubrication curve oil injection control method and system based on off-station distance, which comprises the following steps: pre-storing all curve lines in the train operation line to form a curve line data set; determining the off-station distance between the current position of the train and the last station in real time during the train operation; judging whether the train is in the curve line according to the off-station distance and the curve line data set in real time, and controlling the train wheel flange lubrication device to spray oil when it is judged that the train is currently in the curve line. The application can accurately judge whether the train is in the curve, so as to trigger the wheel flange lubrication device to spray oil only in the curve line that needs to be lubricated, effectively realizing the intelligentization, precision and high efficiency of the curve lubrication, thereby reducing the wheel flange wear, reducing the wheel-rail noise, improving the wheel flange lubrication efficiency and reliability, and further improving the safety and economy of the train operation.

The present invention discloses a long-wave height irregularity detection method and device, relating to the field of railway track inspection technology. The method comprises: performing mileage error correction on the track inspection data based on the measured superelevation in the track inspection data and the design plane curve information in the high-speed railway ledger information; constructing the design elevation of the longitudinal section of the track section based on the mileage error-corrected track inspection data; performing high-pass filtering on the design elevation of the longitudinal section of the track section using a high-pass filter with a preset cutoff wavelength to obtain the long-wave height irregularity of the design elevation of the longitudinal section of the track section; and subtracting the long-wave height irregularity of the design elevation of the longitudinal section of the track section from the long-wave height irregularity of the mileage error-corrected track inspection data to obtain random irregularity. The present invention can provide a data basis for scientifically evaluating and controlling the vertical curve line shape and dynamic long-wave height irregularity of the track.

The present invention provides a design method for the vertical stiffness of the track transition section in the track curve section, including the following steps: Step 1: Simplify the force on the rail under the action of the load into an elastic foundation beam model, and determine the force on the rail under the action of the load; Step 2: Calculate the stiffness setting parameters of the transition section track; Step 3: Calculate the lateral force generated when the train passes through the curve; Determine the lateral centrifugal force generated when the train passes through the curve, and reduce the generation of the lateral centrifugal force by setting a superelevation to generate a force opposite to the lateral centrifugal force, and calculate the lateral force generated when the train runs through after setting the superelevation on the track curve line; Step 4: Calculate the influence of the lateral force on the additional vertical force of the left and right rails; Step 5: Obtain the calculation formula for the vertical stiffness design parameters of the inner and outer rail transition section tracks; Solve the problem that the stiffness of the track transition section cannot be designed and calculated for the curve section.

The invention relates to a line curve information checking method based on broken lines, and belongs to the field of subway rail transit. According to the method, a broken line function set is established by adopting line curvature and gradient information existing in data sources I, II, III and IV, content comparison between different data sources is carried out based on included angles between adjacent curves and curve segment lengths, and a content comparison result is quantized by adopting a parameter of similarity; and according to the optimal overall similarity between the adjacent multiple sections of curves, carrying out position realignment on the data in the region between different data sources. According to the method, the data source 3 finally used by the equipment is taken as the center, and a new inter-equipment relative position and slope representation mode is adopted, so that the data source 3 can directly compare the equipment position information consistency with the data source 1, the data source 2 and the data source 4; the method is still suitable for the condition that the public starting point cannot be found due to the fact that the equipment name is not unique, the kilometer post is wrong and the section information is wrong.

An optical fiber accessory includes following components. The seat defines an insertion slot extending in an insertion direction. The multi-core terminal defines core slots extending in the insertion direction and in spatial communication with the insertion slot. The cover is separably attached to the seat, and defines an internal space in spatial communication with the core slots. The loop module is disposed in the multi-core terminal, extends into the internal space, and includes straight line segments extending from the core slots into the internal space, and curve line segments disposed in the internal space. A number of the curve line segments is half of that of the straight line segments. Two ends of each of the curve line segments are respectively connected to two of the straight line segments.

The present invention proposes a method for realizing the CAD line type wandering effect, which relates to the technical field of surveying and mapping applications and is applied when drawing line type patterns that require line type wandering drawing. First, the current CAD version is judged, and according to the judgment result, a line type rendering interface is called or an object of a custom class is recreated to determine the curve line type. Finally, after the drawing interface selects the required pattern from the line type wandering database, according to the determined curve line type, the specified pattern is drawn at the specified position, so as to realize the line type wandering effect. The drawn CAD line types all have the required patterns at the ends, and the interval of the pattern symbols between the line types can be adjusted as required, and line type symbols that meet the requirements can be drawn; at the same time, this solution is also compatible with the line type wandering processing of high and low version CADs. The present invention also proposes a CAD line type wandering effect realization system for realizing the CAD line type wandering effect realization method.

The invention discloses a steel rail profile optimization design method based on steel rail abrasion evolution, and relates to the technical field of steel rail grinding target profile design. The method comprises the following steps of data processing and abrasion distribution calculation, wheel-rail geometric contact characteristic and wheel set transverse movement amount calculation, contact stress density distribution calculation, abrasion distribution-contact stress density distribution similarity calculation, wheel tread inverse solution and steel rail profile multi-objective optimization. The wheel tread is reversely deduced through abrasion evolution, the data requirement is remarkably reduced, complex dynamic modeling is avoided, the method is suitable for linear and curved lines, the running stability of a vehicle can be effectively improved, the derailment coefficient and the abrasion index are reduced, and the service life of a steel rail is prolonged; the problems that an existing design method is difficult in data collection, tedious in process and limited in popularization are solved.

The application discloses a bridge erecting machine capable of realizing small curve line and belongs to the technical field of bridge erecting machines. The bridge erecting machine capable of realizing small curve line comprises a main beam arranged on a bridge, two hoisting trolleys movably arranged on the main beam in the length direction, a rear support leg arranged at the end of the main beam, a mounting seat connected with the rear support leg and rotatably arranged on the main beam through a rotating shaft, a front support leg arranged at the front end of the main beam and provided with a position adjusting mechanism for driving the main beam to rotate, and a middle support leg arranged on the main beam and arranged between the front support leg and the rear support leg. The position adjusting mechanism is used for driving the main beam to deflect the box girder, so that the box girder is convenient for the construction of the small curve line. The auxiliary supporting mechanism is used for enhancing the connection stability between the front support leg and the bridge, effectively supporting the main beam and the box girder deviated from the straight line, guaranteeing the transverse deviation stability of the main beam system and meeting the demand of the small-radius curve span construction.

The utility model discloses a diversion quick-drying spunlace non-woven fabric which comprises a first spunlace non-woven fabric layer and grain parts arranged on the first spunlace non-woven fabric layer, and the grain parts are sequentially arranged and distributed on the top face of the first spunlace non-woven fabric layer. The line part comprises a first rolling curve line and a second rolling curve line which are in mirror symmetry; the first rolling curve lines and the second rolling curve lines of the line parts are in point contact, and the corresponding first rolling curve lines and the corresponding second rolling curve lines of every two adjacent line parts are in point contact, so that independent convex surface parts are defined on the top surface of the first spunlace non-woven fabric layer; and drainage grooves are formed in the convex surface part in an array manner. According to the flow-guiding and quick-drying spunlace non-woven fabric, liquid can permeate through the convex face part, part of liquid is guided into the line part along the surface of the convex face part, rapid dispersion and flow guiding are carried out along the line part, the permeation rate is increased, the contact area with the human body is reduced, and the ventilation and drying effect is improved.