9 results about "Elliptic cylinder" patented technology

The invention provides a tunnel point cloud adaptive elliptic cylinder filtering method based on affine constraint, and relates to the technical field of point cloud data processing, and the method comprises the steps: extracting a tunnel center line, and setting a cross section; initializing parameters of the elliptic cylinder model by using principal component analysis; setting an initial screening threshold value, and dynamically estimating an optimal threshold value by adopting an RANSAC (Random Sample Consensus) algorithm; constructing a multi-objective optimization function comprising a data fitting error term, a parameter smoothing constraint term and an affine transformation constraint term, and optimizing model parameters; and filtering the point cloud data based on the optimized model and the dynamic threshold. Affine transformation constraint and self-adaptive parameter constraint mechanisms are innovatively introduced, the constraint threshold is dynamically adjusted according to the local curvature and the deformation degree, a special recognition and processing mechanism is developed for a special area, the geometric continuity of the model and the adaptability to the complex environment are remarkably improved, and the method is suitable for large-scale popularization and application. The separation effect of noise points and structural points is improved, and a reliable data basis is provided for tunnel three-dimensional reconstruction and deformation analysis.

The present application relates to a kind of easy to dismantle buckle, including buckle body, elliptic cylinder is arranged above the bottom surface of buckle body, mounting hole is arranged in the bottom surface of buckle body and goes into the lower end of elliptic cylinder, the upper end of elliptic cylinder is not connected with buckle body, and recessed hole is arranged on the upper end surface of elliptic cylinder, and opposite clamping teeth are arranged on the side wall of recessed hole;Through hole is arranged at the corresponding place of buckle body and recessed hole.This technical solution realizes the fixation of four-way pipeline by four groups of opening and closing devices, and the disassembly between each pipeline is not affected by each other, can be independently operated, and the convenience and versatility are better.The present application realizes the fixation of four pipelines in limited space and designs the locking mechanism that is easy to disassemble, realizes the maximization of function and space utilization.The present application has mounting hole, sets up damping pad inside, and sets up shock pad outside, effectively improves the reliability and quietness after fixing.

The application provides a three-dimensional camera perspective-based ellipse pattern generation method and system. The method according to the application comprises: transforming a three-dimensional curved surface to a local coordinate system of an elliptic cylinder to obtain a converted three-dimensional curved surface; obtaining user input, defining an elliptic cylinder based on the user input and a three-dimensional camera perspective; performing intersection detection calculation on the converted three-dimensional curved surface and the elliptic cylinder, and visually outputting the intersection result to obtain a final ellipse pattern; the method further comprises: dynamically adjusting an intersection condition in the intersection detection calculation process according to user demand; wherein the intersection condition comprises a value range of an intersection region. That is, the application provides a three-dimensional elliptic cylinder surface intersection detection method based on coordinate transformation. Points in a world coordinate system are converted to a local coordinate system of an elliptic cylinder, and an elliptic equation is combined for judgment, thereby realizing high-precision and high-efficiency geometric recognition and pattern generation.

The application discloses a local elliptic cylinder magnet magnetic field calculation method and system based on an equivalent magnetic charge method, establishes a local elliptic cylinder magnet magnetic field mathematical model, sets parameters of the local elliptic cylinder magnet, brings the parameters of the local elliptic cylinder magnet into the local elliptic cylinder magnet magnetic field mathematical model, solves the model, and obtains the magnetic field of the local elliptic cylinder magnet. The application can accurately and quickly calculate the space magnetic field of the local elliptic cylinder magnet magnetized in any direction in the xoy plane, is helpful for subsequent accurate solution of the magnetic field gradient, control of the space magnetic force, and analysis of the dynamic movement of the magnetic beads.

The invention discloses a circular and elliptic composite configuration double cyclone matched with a cyclone trapped vortex combustion chamber. The circular and elliptic composite configuration double cyclone comprises an inner cylinder, a middle cylinder, an outer cylinder, a venturi tube, N1 first blades and N2 second blades, the inner cylinder is a solid cylinder, the middle cylinder is a hollow cylinder, and the outer fixed cylinder is a hollow elliptic cylinder; the N1 first blades are uniformly arranged between the outer cylinder and the middle cylinder in the circumferential direction, and the N2 second blades are uniformly arranged between the inner cylinder and the middle cylinder in the circumferential direction, so that the inner cylinder, the middle cylinder and the outer cylinder are coaxially arranged from inside to outside; and the upstream of the venturi tube is coaxially and fixedly connected with the downstream of the middle cylinder, and the venturi tube is used for promoting crushing and atomization of fuel oil. According to the invention, gas is swirled through the first-stage circular swirler to generate an on-duty stable backflow area so as to ensure the stability of on-duty flames; meanwhile, through the two-stage oval swirler, high-speed rotating jet flow is generated in a main combustion area of the head of the combustion chamber, oil and gas mixing is promoted, and the structure of the novel trapped vortex combustion chamber is matched with that of the novel trapped vortex combustion chamber on the basis of guaranteeing flame stability.

The clamp spring auxiliary installation device comprises a workbench, a clamp spring containing table is arranged on the workbench and installed on a supporting table through a sliding sleeve, a round clamp spring groove is horizontally formed in the upper surface of the end of the clamp spring containing table, and a workpiece hole is formed in the bottom of the clamp spring groove; a through hole is also formed in the supporting table, a vertical groove is formed in the end of the clamping spring containing table, and the vertical groove communicates with the clamping spring groove; a driving assembly is further arranged on the workbench, an inner supporting assembly is arranged on the driving assembly, the inner supporting assembly is arranged at the end, close to the clamping spring groove, of the clamping spring containing table, the inner supporting assembly comprises a vertically-arranged driving plate, and an elliptic cylinder is arranged at the end, close to the vertical groove, of the driving plate; the axis of the elliptic cylinder is parallel to the plane of the driving plate, and a limiting plate is arranged at the top of the elliptic cylinder. The problems that the expansion process of the clamp spring cannot be accurately controlled, the clamp spring is easy to pop out or deform, and the fatigue strength is high are solved.

The application discloses a tunnel excavation face limit support force calculation method based on a whole analysis method, and comprises the following steps: step 1: a limit support force calculation model of an excavation face is proposed based on the whole analysis method; step 2: according to the theoretical model, a calculation formula of the limit support force of a shield excavation face is derived; and step 3: a corresponding loose zone model of a shield tunnel damage is proposed, wherein the model comprises a shallow-buried shield tunnel damage model and a deep-buried shield tunnel damage model. The whole analysis method is applied to the excavation face stability problem, and a calculation model of the excavation face stability is established. According to the tunnel deep and shallow burying, an elliptic cylinder-type general arch model considering the soil arching effect is established. The limit support force obtained by the application presents a consistent development trend with the numerical simulation and the existing theoretical results. In addition, the calculation time of the analytical solution is far less than the calculation time of the numerical simulation, and a new idea is provided for the design of the limit support force of the excavation face.

The invention discloses a supporting device of an elliptic cylinder radar, and relates to the technical field of radar structures. The supporting device comprises a radar body, the radar body sequentially comprises a radar rear boundary, a radar rear end, a radar front end, an antenna part and a radar front boundary from back to front, and the two sides of the radar front end and the two sides of the radar rear end are fixedly provided with a first supporting frame and a second supporting frame through fixing bolts; and two groups of limiting and leveling pieces are arranged between the first supporting frame and the second supporting frame which are arranged on the same side. The radar main body is effectively supported through the first supporting frame and the second supporting frame, the connecting stability of the first supporting frame and the second supporting frame is further improved in cooperation with the limiting leveling piece, the stability requirement of the radar main body in the three-axis six-direction direction can be met, stable supporting guarantee can be provided in the radar main body transferring process, and the stability of the radar main body is improved. And the structure is convenient to adjust, the radar main body can be tested without disassembly, and both the transfer efficiency and the test efficiency are considered.

The invention relates to the technical field of vibration control, and discloses a metal rubber vibration isolator with unequal rigidity in the radial direction and a design method thereof.The metal rubber vibration isolator with the unequal rigidity in the radial direction is formed by using a mandrel as a supporting body and using a metal rubber net backing ring as an elastic bearing element of the vibration isolator. The metal rubber vibration isolator can achieve three-direction vibration reduction in the space in the working process. The core shaft adopts an elliptic cylinder with an elliptic cross section, the inner diameter of the metal rubber net backing ring is equal to the diameter of a short shaft of the elliptic cylinder, the long shaft of the elliptic cylinder is used for prepressing the inner wall of the metal rubber net backing ring in the radial direction, the compression amount of the metal rubber net backing ring in different radial directions is changed, and a structure with unequal radial rigidity is formed; the metal rubber vibration isolator has different rigidities in the radial direction of the mandrel, so that the metal rubber vibration isolator can realize vibration isolation of different frequencies in different radial directions, and the problem of different vibration reduction and isolation frequencies in different radial directions is solved.