51 results about "Planar curve" patented technology

User interactive methods of determining vertex correspondence between boundaries or curves on objects to be merged is provided. One method relates to projecting a boundary of one object onto a second object to determine a merging curve, along which the two objects will be joined. Another method includes projecting a first object onto a plane to form a planar curve. The planar curve is then mapped to a second object to form a merging curve. Still another method includes interactively selecting corresponding key vertices on different objects to form a merging curve. A system presented that can use one or more of the methods of determining correspondence between boundaries. A merged object can be generated from the merging curve using a mesh solver, such as a Poisson or non-Poisson mesh solver.

A system and method for segmenting and editing anatomical objects from medical images is disclosed. The system may be a medical diagnostic imaging system. A computer unit may execute computer software for segmenting anatomical objects from medical images. The computer software may extract an anatomical object from planar curves. The computer software may extract an anatomical object by computing the centerline of the anatomical object. A set of reformatted images may then be derived based on the centerline of the object. A user may then provide input in the form of user drawn contours on a plurality of reformatted images. In an embodiment the reformatted images may include a reformatted longitudinal view, a curved reformatted view, or a lumen view. The user drawn contours may correspond to the boundaries of the anatomical object to be segmented. The anatomical object may then be extracted based on the user drawn contours.

A system and method for segmenting and editing anatomical objects from medical images is disclosed. The system may be a medical diagnostic imaging system. A computer unit may execute computer software for segmenting anatomical objects from medical images. The computer software may extract an anatomical object from planar curves. Additionally, the computer software may correct the shape of an existing three-dimensional anatomical object from planar curves. The planar curves may be orthogonal to each other. A user may contour of an anatomical object on a plurality of slices, such as an axial slice a sagittal slice, a coronal slice, or some combination thereof. The contour may be drawn using a tracing pen on a display unit. The display unit may receive touch screen input from the tracing pen. The display unit may display the three-dimensional segmented anatomical object.

Electronic devices may be provided with antennas. The antennas may include conductive antenna cavities. Antenna resonating elements may be mounted in the antenna cavities to form cavity antennas. An antenna cavity may be formed from metal structures with curved edges that define a curved cavity opening. A flexible printed circuit substrate may be coated with a layer of metal. Slot antenna structures such as a directly fed antenna slot and a parasitic antenna slot may be formed from openings in the metal layer. The flexible printed circuit substrate may be flexed so that the antenna resonating element forms a non-planar curved shape that mates with the opening of the antenna cavity. A ring of solder may be used to electrically seal the edges of the cavity opening to the metal layer in the antenna resonating element. The curved opening may be aligned with curved housing walls in an electronic device.

Featured are a non-planar curved dye-sensitized solar cell and a method of manufacturing such a solar cell. In particular aspects, such methods include preparing two curved substrates, forming a first curved conductive substrate for a working electrode and a second curved conductive substrate for a counter electrode, coating a metal electrode and a protection film on each of the first and second curved conductive substrates, forming the working electrode by coating a semiconductor oxide electrode film on a concave surface of the first curved conductive substrate and by adsorbing a dye in the semiconductor oxide electrode film, forming the counter electrode by coating a catalytic electrode on a convex surface of the second curved conductive substrate, and joining the working electrode with the counter electrode and injecting an electrolyte in between the working electrode and the counter electrode.

The invention provides a crane box girder three-degree-of-freedom movable welding robot and belongs to the technical field of robot welding. The welding robot comprises a base, a longitudinal moving mechanism, a welding gun lifting mechanism, a welding gun rotating mechanism, a welding device, a cable drum and the like. The welding device comprises a wire feeder, a welding machine, a gas cylinder base and a carbon dioxide gas cylinder. The welding gun rotating mechanism is installed on the welding gun lifting mechanism through a lifting table. A gear and rack driver is matched with a linear guide rail pair to achieve precise positioning of long-displacement movement. The position and the posture of the welding gun are controlled through three servo motors together to achieve automatic welding of long-distance planar curve continuous smooth flat fillet seams. The welding robot has the technical characteristics of being simple in structure, short in transmission chain, precise in position, reliable in work, stable in welding quality and the like.

The invention discloses a hot-rolled non-flat web H-shaped steel finishing roll profile and processing technology. The H-shaped steel includes a flange plate and a non-flat web. Composition, which is characterized in that: the profile of the web finish rolling roll forms a curved line segment corresponding to each other up and down, and the curved line segment can be a line segment in a plane curve such as an arc line, a hyperbola, a parabola, and an ellipse. The beneficial effects of the present invention are: to provide a finishing roll profile of non-flat web H-shaped steel and its hot-rolling processing technology, the hot-rolled H-shaped steel processed by this method has high precision, and the resistance of flange plate and web plate is high. Strong buckling deformation ability, improved structural performance, overcomes the shortcomings of low processing efficiency in the process of welding the same type of H-shaped steel, especially suitable for mass production process, reduces production costs, and improves production efficiency.

The invention provides a method for reconstructing a temporary diversion tunnel into a permanent flood discharge facility. The method comprises the steps that firstly, an entrance of the original diversion tunnel (1) is blocked; secondly, an entrance curve section of the diversion tunnel and a straight section behind the entrance curve section are reconstructed into an energy dissipation pressure forebay (2), and the wall surface of the tail end of the energy dissipation pressure forebay is provided with a jet flow outlet (3), so that the diversion tunnel section behind the outlet becomes a free flow section (6) of a permanent flood discharge tunnel, wherein the straight section is at least five times longer than the entrance curve section; thirdly, at least one flood discharge tunnel (4) is newly constructed at the position above the entrance of the blocked diversion tunnel, wherein the bottom surfaces of entrances of the newly constructed flood discharge tunnels are at least 2m higher than the highest position which silt silting at the entrances can reach; and fourthly, each newly constructed flood discharge tunnel (4) is connected with the energy dissipation pressure forebay (2) through at least one connecting pipeline (5), and the axes of the newly constructed flood discharge tunnels (4) intersect with the axis of the energy dissipation pressure forebay (2). By means of the method, not only can the diversion tunnel with the planar curve section be smoothly reconstructed and utilized, and investment is saved for a whole water conservancy and water power project, but also the energy dissipation effect can be improved, and the service life of a building is prolonged.

The invention relates to a vehicle behavior spatial-temporal evolution modeling method under a path constraint condition and application thereof. The modeling method includes the steps that 1, a vehicle operating route is obtained and abstracted into a space curve; 2, geometric invariant parameters of the space curve, namely arc lengths, curvature and torsion of all points on the space curve are used for setting up Serret-frenet movable frames representing motion of a vehicle along the space curve; 3, the corresponding relation between all the points on the space curve and time changes in the vehicle operating process is determined, the Serret-frenet movable frames at all the points are combined to obtain speeds and accelerated speeds, at all the points, of the vehicle through calculation, and a vehicle behavior spatial-temporal evolution model under the path constraint condition is set up. Compared with the prior art, the operating route of the vehicle is abstracted into the space curve instead of a planar curve, and compared with an existing mode of abstracting the operating line into a straight line or a two-dimensional curve, the vehicle behavior spatial-temporal evolution modeling method has higher applicability.

A centrifuge having a rotating frame, which is rotatably mounted on a stationary frame, and a separation unit mounted on the rotating frame, rotating about a central axis of rotation in the same direction of rotation as the rotating frame but at twice the rotational speed. A line for supplying and/or removing a fluid is connected to the separation unit and is guided in a loop about the separation unit to a stationary tie-in point. To support the line, at least one guide element having a bearing surface for the line is provided. The bearing surface of the guide element is formed by a rotating planar curve, where the radius of the respective circle of curvature contacts the curve at a point and increases with increasing distance between the contact point and the central axis of rotation. With this contour, abrasion over the entire contact surface is largely uniform, which thereby lengthens the lifetime.

The invention relates to a method for controlling a moving slide block on a curved surface, relating to a slide block motion mechanism. The method provided by the invention is low in cost, is simple to operate and can be used for realizing accurate moving and positioning. The method comprises the following steps: firstly, setting an electromagnet array and a drive control circuit of the electromagnet array; then programming a control program, turning on a power supply to cause a singlechip to operate, and issuing a control instruction to all the electromagnets by the singlechip; and sequentially switching on/off all the electromagnets according to the set program, and sequentially sucking all the electromagnets with the moving slide block according to the switching sequence to cause the moving slide block to accurately move, stop and reset, thus realizing accurate control on the curved surface track of the moving slide block. Complex three-dimensional spatial curve motion control is changed into two-dimensional planar curve switching control; the traditional mode of motion of the slide block driven by a motor is broken through, and invisible motion of magnetic poles is utilized to control visible motion of the slide block; and the characteristic that the magnetic poles with same polarities repel each other but magnetic poles with opposite polarities attract each other can be utilized to realize accurate control on the static position of the slide block.

The present invention relates to a system and method for identifying scale invariant features of image outlines. The method comprises the steps of; receiving a parametric equation of a closed planar curve; choosing nodes on the closed planar curve with equal intervals; generating a continuous scale space of the nodes on the curve; calculating circle of curvature for every node on the closed curve for every scale in every octave; finding circle of curvature differences between plurality of adjacent scales; comparing each curvature difference value and choosing the nodes with a minimum or maximum curvature difference as feature points; representing the outline with a descriptor including all the feature points. The method further comprises the steps; eliminating the feature points which are closer to each other than a predetermined threshold; and comparing a descriptor with each previously recorded descriptor belonging to various outlines, finding at least one descriptor with a good match.

The invention provides a power transformation engineering enclosing wall modeling method based on a BIM technology. The power transformation engineering enclosing wall modeling method comprises the following steps: 1, drawing an enclosing wall model line in Revit software; 2, converting the enclosing wall model line into a two-dimensional plane curve in Danymo; 3, creating a wall body model basedon the two-dimensional plane curve; 4, based on the enclosing wall model line in the step 1, converting the enclosing wall model line into a dynamo geometric primitive as a wall column axis; 5, creating a wall column center point based on the wall column axis; 6, creating a wall column model based on the wall column center point; and 7, adjusting the direction of the wall column model to completewall modeling. According to the method provided by the invention, a Dynamo editing logic relationship and algorithm are utilized, and an enclosing wall body and a wall column model are quickly generated based on an enclosing wall axis drawn in Revit. Parameters such as sectional dimensions, heights and materials of the wall body and the wall column can be customized according to requirements, thedistance, the sectional direction and the elevation of the wall column can be flexibly set, modeling and model modification processes are simple and convenient, results are accurate, and the design efficiency is improved.

The invention relates to the technical field of numerical control machining and control and provides an X-C direct driven grinding profile error non-linear coupling control system and method. The system comprises a CNC interpolator, an X axis motor control unit, an X axis motor driving unit, an X axis linear motor and an X axis linear grating which are sequentially coupled, a C axis motor control unit, a C axis motor driving unit, a C axis moment motor and a C axis round grating which are sequentially coupled as well as a non-linear coupling controller; the non-linear coupling unit obtains the tracking error of each axis according to the command position and the fed position result of each axis, a profile error is obtained after coupling calculation, and then a compensation quantity is distributed to each axis motor driving unit according to the coupling gain of each axis. The profile error can be fast calculated according to the machining features in the X-C grinding machining of a planar curved profile part, a compensation coefficient can be provided and the profile machining precision of the X-C direct driven flat grinding table is effectively improved.

The invention discloses a mobile measuring instrument and a measuring method of the material level in a storage warehouse. The rear part of a collimating hole of a shielding container is equipped with a gamma-ray source rotating block, a detector is fixed on the shielding container, a lifting device is installed on the shielding container, and a transmission signal cable of the detector is connected with a host. The method for measuring the material level in the storage warehouse is as follows: the shielding container moves form the bottom part of the storage warehouse to the top part of the storage warehouse, the host constructs a planar curve graph according to the counting rate transmitted by the detector in real time, wherein, the horizontal axis is the counting rate, and the vertical axis is the movable height of the shielding container, the state and the property of the material in the storage warehouse are analyzed and judged according to the curve. The measuring instrument has simple structure and easy operation, can be installed on a movable dolly, or is broken into several blocks to be reassembled in different places, thereby measuring different storage warehouses. An instrument of measuring equipment can measure a plurality of storage warehouses, thereby saving a great amount of cost and having high measuring efficiency.

The invention discloses a method for repairing the design defect of concave cusp pitch curve of N-leaf non-circular gear, this method takes the given turning time of the repaired joint curve as the constraint condition, based on the analysis of the concave cusp characteristics of pitch curve in N-blade non-circular gear transmission, a planar curve with minimum average kinetic energy is designed based on variational principle, and the plane curve is used to replace the pitch curve of the non-circular gear in the tiny neighborhood with concave cusps, the minimum average kinetic energy repair ofN-blade non-circular gear pitch curve concave cusp design defects is realized, which overcomes the shortcomings of the existing repair methods of N-blade non-circular gear pitch curve concave cusp design defects, and meets the requirements of high stability transmission of N-blade non-circular gear pairs.

The invention relates to the technical field of civil engineering and municipal engineering, and discloses a BIM-based three-dimensional engineering curve automatic fitting method, which mainly comprises the steps of automatically obtaining graphic information of a plane curve and a longitudinal section curve of AutoCAD through a visual programming plug-in Dynamo, parameterizing design control points and creating a control point list; extracting and calculating coordinate information of the control point positions, automatically outputting a coordinate information table of the control point positions, generating three-dimensional point positions according to the coordinate information, fitting the three-dimensional point positions into a three-dimensional engineering space curve, outputting a model to Revit, and mounting attribute information. Operation is carried out on a visual programming plug-in Dynamo, programming is carried out by using DesignScript and Python languages, a three-dimensional engineering curve model and a control point position coordinate information table are automatically generated, the control point position measurement working precision during subsequent construction is improved, meanwhile, attribute management information is mounted in the three-dimensional engineering curve model, and the engineering information management efficiency is effectively improved; and construction quality is controlled.

The sharpening method of wavy edge of different material for cutter includes the following steps: 1. determining the connecting points comprising planar curve and/or linear section comprising the edge end; 2. calculating the polar angle corresponding to planar curve and/or linear section comprising the edge end; 3. setting perimeter coordination system; 4. determining the planar feeding step length of planar curve and/or linear section comprising the edge end and the coordinates of planar feeding step length points; 5. calculating the z coordinates of the step length points; 6. feeding to new coordinate; and 7. repeating the steps from 3 to 6 one section by one section until completing sharpening all the edge curves. The present invention adopts numerically controlled machine tool with parameter programming function to realize the automatic sharpening and has high sharpening precision and greatly raised efficiency.

The invention discloses a safety lifting device for a wind energy apparatus. The device comprises a hanging bracket, a sucker mechanism and a control mechanism, the hanging bracket is provided with aconnecting frame, a laser proximity switch is arranged at the lower part of the hanging bracket, the connecting frame is provided with a lifting hook, the lifting hook is connected with a cable drum through a cable, the sucker mechanism is arranged in the hanging bracket, a sucker, an air tube and a driving mechanism are arranged in the sucker mechanism, the air tube and the driving mechanism areboth connected with the sucker, the control mechanism is mounted on the hanging bracket, and the laser proximity switch, the air tube and the driving mechanism are all connected with the control mechanism. The laser proximity switch arranged on the hanging bracket is used to detect a distance between the hanging bracket and a ribbed plate to be lifted, a laser displacement sensor is sued to detectthe position, and the control mechanism controls the sucker mechanism to adsorb the ribbed plate and lifts the ribbed plate to an assigned position according to the detected data, so the working efficiency is greatly improved, and the lifting problem of planar curved ribbed plates is well solved.