22 results about "Curve design" patented technology

The present application relates to the gradual formation and the same profile combination tenon and slot cutter blade shape space curve parameterization design method, including the following steps: step one, shooting tenon and slot image; Step two, tenon and slot shape curve is discrete; Step three, calculate control point and fit approximation curve; Step four, the same profile cutter tooth space curve design: step five, gradual formation type cutter tooth space curve design; Step six, tenon and slot broach cutter tooth space curve output. The present application reduces the difficulty of tenon and slot broaching cutter space curve parameterization design; The parameterization of the cutter blade space curve realizes the unity of parameter selection, improves the stability of the broach design, and proposes the transition boundary and method of the gradual formation and the same profile combination, solves the problem of difficult to determine the gradual formation and the same profile transition method, reduces the design difficulty; At the same time, the parameterization design solves the long cycle and low efficiency problem of the traditional design method, improves the design efficiency of the broach, and reduces the cost of broach design and manufacturing.

The application discloses a kind of aerodynamic configuration structures and design methods of precision guidance assembly, belong to the field of precision guidance technology, assembly precursor uses continuous three curve design: supersonic section, uses parabolic profile, surface is provided with rib, for optimizing shock control under supersonic working condition;Transonic section, uses hyperelliptic surface, surface is provided with rib and is pasted on rib with super material, for inhibiting transonic separation;Subsonic section: using circular arc transition, surface is provided with rib, for improving rudder surface lift efficiency;Wherein, curvature is continuous at three curve junctions.The application realizes supersonic-transonic-subsonic three-section coordinated design, simultaneously combines the coordinated drag reduction design of micro rib and super material technology, improves boundary layer from micro level, optimizes and improves the performance of guidance assembly.

The application discloses a single fulcrum flexible wall nozzle profile curve design method. The method comprises the following steps: obtaining design parameters and a target profile curve of a single fulcrum flexible wall nozzle; determining initial values of support rod parameters according to the design parameters; writing a profile curve calculation program by using MAPLE software, inputting the design parameters and the initial values of the support rod parameters into the profile curve calculation program, and calculating the profile curve; subtracting the target profile curve from the profile curve to obtain a profile curve deviation; when the profile curve deviation is greater than a maximum profile curve deviation, adjusting the numerical values of the support rod parameters according to the profile curve deviation, repeatedly performing iterative calculation by using the MAPLE software, and obtaining the profile curve deviation between the profile curve and the target profile curve being less than the maximum profile curve deviation until the profile curve is obtained. The application does not use a finite element modeling simulation process, has the advantage of short design period, and guarantees the solving precision through elliptic integral solving derived according to the Euler-Bernoulli beam large deformation theory.

According to the discrete grid implicit curve design method based on the deep neural network, an implicit scalar field is constructed through grid interpolation points, curve implicit expression is predicted through the neural network, geometric priori such as interpolation constraint, smoothness constraint and user-defined feature constraint is fused, and adaptability and numerical stability to low-quality grids are enhanced. The network integrates an efficient channel attention module and a lightweight gating unit, the feature extraction capability is enhanced, and the calculation efficiency is improved; and adopting a two-stage training strategy, namely pre-training and optimizing the initialization capability, and then quickly optimizing and converging to a target curve, so that the overall training effect is improved. Compared with a traditional method, the method can still stably generate a high-fidelity curve on the degraded grid, supports feature alignment and obstacle avoidance design based on user intention, is outstanding in robustness and practicability, and has wide application prospects in the fields of CAD / CAM, virtual surgery, geometric modeling and the like.

The present invention discloses a method for designing a tapered roller convexity curve, comprising the following steps: S1, establishing a roller convexity design formula based on a traditional formula as follows: Hc(y)=Zm*f(x), wherein Zm is the convexity value of the roller profile edge, and f(x) is a dimensionless convexity profile curve; S2, calculating the convexity value of the roller profile edge according to the formula Zm=a(Dwe+Lwe)+b, wherein: a=0.3055*3.0175 d Linear regression parameter, b=(2.3303*d) 0.2346 / d ; Where d is the rated dynamic load Cr of the bearing with a certain ratio, Dwe is the large end diameter of the tapered roller, and Lwe is the length of the tapered roller; S3, calculate the f(x) convexity profile curve according to the formula 1 / (-3.47353708848685+4.48386445486252*x^-2.07007866882978), where: where x is the ratio of the distance from a point on the roller contour line to the midpoint of the roller to the effective length of the roller. The calculation method is simple, efficient and convenient, involves few parameters, and has good reliability.

The present invention provides a design method for the edge curve of a fine milling blade. First, the theoretical profile of the workpiece to be machined is obtained, and the involute part of a single tooth profile is evenly divided in a rectangular coordinate system as the original coordinate points for curve fitting. Secondly, the improved moving least squares method (MLS) is used to fit the tooth profile coordinate points to obtain a curve shape that conforms to the involute of the tooth profile, and then it is reflected on the edge curve of the fine milling cutter head. Finally, a comparison is made between it and the edge curve of the tool designed by the traditional method: the approximate circular arc design based on the least squares method during milling, and the tooth profile allowance conditions after machining with the two different tools are obtained to verify the effectiveness of the proposed method. By constructing a new function, the present invention reduces the errors existing in the curve fitting process and applies it to the design of the edge curve of the fine milling blade, making the edge shape of the blade closer to the actual profile of the workpiece, optimizing the blade, and improving the accuracy of gear milling.

The invention relates to a cover plate reset auxiliary folding device and method, and belongs to the field of safety buffer equipment. According to the technical scheme, the cover plate reset auxiliary folding device comprises a base and a connecting rod mechanism, the base is provided with a hinge position point and a curve guide structure, and the curve guide structure is located below the front side of the hinge position point; the connecting rod mechanism comprises a basic rod body and an action rod body, the first end of the basic rod body is hinged to the hinge point, a linear driving assembly is arranged in the middle of the basic rod body, the middle of the action rod body is hinged to the moving end of the linear driving assembly, and the first end of the action rod body is installed in the curve guide structure through a connecting shaft; and a connecting rod body is arranged between the second end of the basic rod body and the second end of the action rod body. According to the scheme, on the basis of the connecting rod mechanism, through the curve design of the curve guide structure, the action of firstly pressing down and then lifting up is achieved, 180-degree overturning resetting of the cover plate is completed, manual labor is replaced, the risk of personal injury is reduced, and the working efficiency is improved.

The invention discloses an optimization method for a cubic parabola easement curve linear equation of railway and rail transit, so as to ensure that the actual calculation length of an easement curve is consistent with the length required by design, the calculation curvature radius of a slow point or a circle slow point is consistent with the radius required by design, and smooth connection between a circular curve and the easement curve is ensured. The construction and operation safety of rail transit such as railways is ensured, and the riding comfort is improved. The method includes the following steps that firstly, the length required by easement curve design is met, and a parameter X value is calculated; 2, a parameter J is calculated when the design requirement radius is met; cubic parabola easement curve equation after constant optimization, and calculation formula of curvature radius of any point on easement curve and length from straight-slow point or slow-straight point as follows: # imgabs0 #

The invention provides a wave generator cam curve design method, device and equipment and a storage medium, and the method comprises the steps: loading a true circle radius and cam deformation, and guaranteeing that the true circle length is consistent with the perimeter of an improved curve; constructing a tangent polar coordinate equation of the improved curve based on Fourier expansion, wherein the equation comprises a group of Fourier coefficients; according to the equation, the deformation amount, the extreme value angle corresponding to the extreme value of the curvature variable amount and the curvature ratio, candidate parameters and candidate polar diameters are determined under the condition that a first constraint condition is met; calculating a difference value between the candidate polar radius and a standard ellipse polar radius, wherein the standard ellipse and the improved curve have the same semi-major axis and perimeter; and finally, determining the target polar radius and the contour parameters of the improved curve by combining the polar radius difference, the corresponding polar angle and a second constraint condition.

The present invention discloses a novel structure with bidirectional zero Poisson's ratio effect and a loading method, which relates to the technical field of structural design and manufacturing. The novel structure includes a structural unit, which includes: a connecting wall assembly, including 4 connecting wall units, the cross-sectional profile of the connecting wall unit is square, and the 4 connecting wall units are arranged in a rectangular array; a connecting assembly, including 4 connecting units, and the 4 connecting units are arranged in a circular array with the center of the connecting wall assembly as the center of the circle, each connecting unit is located between two adjacent connecting wall units, and the two ends of each connecting unit are respectively connected to the two adjacent connecting wall units. The novel structure can provide a zero Poisson's ratio effect in two directions of a two-dimensional plane; the novel structure is composed of a plurality of structural unit rectangular arrays, and the Poisson's ratio effect of the novel structure has no correlation with the Poisson's ratio of the material; the novel structure has the characteristics of simple structure, no complex curve design, and can simplify the production process.

The invention discloses a balanced vane pump stator inner curve design method. The method comprises the steps that S1, an inner curve outline of a sample piece stator is obtained; s2, preliminarily estimating a lift angle of a sample stator; s3, checking stator displacement; s4, polar coordinate data of a set number of points on the inner curve contour of the stator are obtained; s5, converting the polar coordinate data of the set number points into rectangular coordinates; s6, copying the rectangular coordinate data value to the first file; s7, opening the first file by adopting three-dimensional software; s8, after a curve is generated in the three-dimensional software, exporting and storing the curve as a second file in a set format; s9, opening the second file, and performing simulation comparison with the inner curve profile of the sample stator; s10, executing the steps S5-S9 again until the generated curve is consistent with the outline of the inner curve of the sample stator; s11, performing stator inner curve trial processing; and S12, checking the profile of the inner curve of the stator subjected to trial processing. According to the balanced vane pump stator inner curve design method, the machining qualification rate of the stator inner curve can be increased.

This application provides a method, apparatus, device, and storage medium for designing a wave generator cam curve. The method includes: loading the radius of a true circle and the deformation of the cam to ensure that the circumference of the true circle is consistent with the circumference of the modified curve; constructing the tangent polar coordinate equation of the modified curve based on Fourier expansion, the equation containing a set of Fourier coefficients; determining candidate parameters and candidate polar diameters under the condition of satisfying a first constraint, based on the equation, the deformation, the extreme angles corresponding to the extreme values ​​of the curvature change, and the curvature ratio; calculating the difference between the candidate polar diameter and the standard ellipse polar diameter, the standard ellipse and the modified curve having the same semi-major axis and circumference; and finally, determining the target polar diameter and the contour parameters of the modified curve by combining the polar diameter difference, the corresponding polar angle, and the second constraint.

A multi-tooth Roots rotor based on a Bezier curve design profile and a design method thereof, the multi-tooth Roots rotor comprising two rotors with the same Roots profile, the two rotors being different in rotation direction and meshing with each other; a single-tooth profile of the Roots profile is formed by splicing a symmetrical upper half curve segment ABCDE and a lower half curve segment AB1C1D1E1; the upper half curve segment ABCDE is composed of a tooth top curve segment and a tooth bottom curve segment, the tooth top curve segment is a combined curve segment of a tooth top circular arc segment AB and a Bezier curve segment BC, the tooth bottom curve segment is jointly composed of a curve segment CD and a dedendum circular arc segment DE, and the curve segment CD is an envelope curve segment of the Bezier curve segment BC; the single-tooth profile of the Roots profile is rotated and spliced to form a complete Roots profile. The multi-tooth Roots rotor has a large adjustable space, so that the performance optimization space based on the existing profile structure is large, and the optimal geometric shape regulation and control under different requirements can be obtained.

The invention provides a volute curve design method and system, electronic equipment and intelligent kitchen equipment. The volute curve design method comprises the steps that n auxiliary volute curves with the expansion degree larger than that of an initial volute curve are generated based on the starting point of the initial volute curve; determining two end points of a curve section to be modified in the initial volute curve; fitting points on the curves of the auxiliary volutes are determined according to the two end points and the circle center of the fan; and fitting the fitting point and the two end points to generate a fitting curve segment, and replacing the curve segment to be modified with the fitting curve segment. According to the method, under the condition that the initial volute curve of the fan is determined, correction is carried out as far as possible on the basis of the initial volute curve, the corrected volute curve keeps the original curve characteristics on the basis of the initial volute curve, the opening degree of the volute curve is increased, and therefore the space of an air duct is increased, and good aerodynamic performance is achieved.

The application discloses a roll type curve control method for improving plate convexity, which comprises the following steps: step one, on-line adjustment of bending roll allowance; step two, relative convexity target value of the outlet of the strip steel; step three, adjustment capacity of the working roll convexity; step four, CVC curve design; step five, rack adjustment capacity; step six, curve equation of the CVC roll; and step seven, calculated value of the roll shifting amount. The improvement of the plate convexity adjustment capacity greatly reduces the situation that the bending roll force load of the finishing mill train exceeds the limit, is very favorable to the improvement of the plate shape control level, and reduces the occurrence of the commodity coil plate shape objection; due to the reduction of the shifting amount, the degree of concentrated wear is reduced, the uneven wear of the roll is reduced, and the roll consumption is reduced.

The invention discloses an amplitude modulation hidden backdoor injection method for a speaker recognition model, and relates to the technical field of voice processing and artificial intelligence safety. According to the invention, the curve design module, the voice sample generation module, the model training module and the evaluation management module are arranged, the defense resistance is strong, the robustness is strong for the existing spectrum analysis and energy detection method, and the method provides a safety test tool with high concealment and strong controllability for the voice safety field. For a commercial voice recognition system, the technology is helpful for finding and eliminating hidden trigger type vulnerabilities in advance, reducing economic loss and reputation risks caused by security problems, managing, visualizing and storing backdoor injection data and corresponding analysis results, and helpful for realizing backdoor injection management through cloud management and control of the Internet of Things. And the intelligent level of backdoor injection management is improved.

The application discloses a variable cross-sectional area distribution based circulating circle design method, which comprises the following steps: obtaining a given circulating circle outer ring; designing a circulating circle flow cross-sectional area distribution curve by using a Bezier curve, taking the flow cross-sectional area at an inlet as a standard, and taking the flow cross-sectional area at other positions as a relative cross-sectional area to obtain a circulating circle flow cross-sectional area distribution result; establishing a polar coordinate system and a rectangular coordinate system; and solving the inner ring coordinates of the circulating circle in the rectangular coordinate system according to the circulating circle flow cross-sectional area distribution result, and drawing an inner ring curve. The design method adopts a mode of fixing the circulating circle outer ring and changing the cross-sectional area distribution to design the inner ring, simultaneously realizes the circulating circle design with adjustable flow cross-sectional area distribution by using the Bezier curve, can separately design the circulating circle cross-sectional area distribution of different impellers, and realizes the variable cross-sectional area distribution design of the variable torque circulating circle.

This invention discloses a method for designing the inner curve of a balanced vane pump stator, comprising the following steps: S1, obtaining the inner curve profile of a sample stator; S2, preliminarily estimating the lift angle of the sample stator; S3, verifying the stator displacement; S4, obtaining polar coordinate data of a predetermined number of points on the inner curve profile of the stator; S5, converting the polar coordinate data of the predetermined number of points into rectangular coordinates; S6, copying the rectangular coordinate data values ​​to a first file; S7, opening the first file using 3D software; S8, after generating the curve in the 3D software, exporting and saving it as a second file in a predetermined format; S9, opening the second file and performing a simulation comparison with the inner curve profile of the sample stator; S10, repeating steps S5 to S9 until the generated curve matches the inner curve profile of the sample stator; S11, performing trial machining of the inner curve of the stator; S12, inspecting the trial-machined inner curve profile of the stator. This method for designing the inner curve of a balanced vane pump stator can improve the pass rate of stator inner curve machining.

This invention provides a method and design for the alignment of high-speed maglev turnouts, including determining the angle constraint between adjacent turnout beams based on the geometric relationship constraints of the track; constructing a straight-line approximation curve design using the standard stator unit length as a constraint; constructing a curve-to-straight-broken-line alignment design using circular curve segments; verifying the parameters of the designed transition curve and circular curve using at least the angle constraint between adjacent turnout beams; solving all parameters of the transition-circular-broken-line turnout alignment after verification; verifying the mechanical performance of the turnout alignment using static stress-deformation, dynamic analysis models, and modal analysis models; and selecting the optimal alignment parameters for the optimal turnout alignment while meeting the mechanical performance requirements. This invention solves the problem that existing turnout alignments are insufficient to meet the needs of practical engineering for turnouts with different levels of lateral passing speed.

The invention discloses a wind power output curve optimization method which comprises the following steps: designing an envelope model based on a generated theoretical wind power output curve, performing piecewise function change on the envelope model according to power change to obtain a minimum value envelope function and a maximum value envelope function, and setting three random working conditions according to the actual operation condition of a fan, different times and time are set for the three working conditions, and different time periods are intercepted through a random algorithm to obtain a final output curve. The method mainly pays attention to increase of medium-low wind speed width and abnormal value scatter simulation, so that a theoretical processing curve is close to the actual value.

The invention discloses a cam curve design method for a paper transfer mechanism of a high-speed printing machine, which belongs to the field of cam design and comprises the following steps of: S1, dividing the movement of a paper transfer gripper into six sections; s2, setting known conditions; s3, designing a fourth section theta3 < = theta < = theta4, a fifth section theta4 < = theta < = theta5 and a sixth section theta5 < = theta < = theta6 by using a standard double-stop cam curve design method; s4, designing a second section of the cam curve by using a polynomial method, wherein theta1 < = theta2 < = theta1; a B spline curve design method is used to design a first section 0 < = theta < = theta 1 and a third section theta < = theta < = theta 2 < = theta < = theta 3 of a paper transfer cam curve, and the angular velocity omega ec of a paper transfer gripper during constant-velocity handover is calculated. According to the cam curve design method, feasible design results are obtained through the polynomial design method and the B spline curve design method, on the basis that the continuity and smoothness of the jump curve can be improved through the B spline curve, the increasing amplitude of the peak acceleration and the increasing amplitude of the peak jump value are effectively controlled, and therefore the optimal design scheme is obtained.

Provided is a groove bottom curve design optimization method for an overflow brick, including: S1: obtaining a standard output of the overflow brick based on design parameters; S2: obtaining an initial groove bottom curve of the overflow brick based on the design parameters and the standard output; S3: obtaining a groove bottom curve of the overflow brick through straight line correction of the initial groove bottom curve based on a length of a splitting block; S4: obtaining an extreme thickness difference of a formed glass substrate through overflow simulation based on the groove bottom curve and the design parameters; and S5: when the extreme thickness difference is smaller than or equal to a preset threshold, processing the overflow brick using the groove bottom curve and the design parameters; and when the extreme thickness difference is greater than the preset threshold, adjusting the design parameters and repeating steps S1 to S4.