62 results about "Tolerance analysis" patented technology

A method for virtual fatigue testing includes reading a coarse-grid finite-element-model of a component from one or more libraries with a computer, and identifying static stress locations neighboring at least one of fasteners and non-fastener stress concentration regions in the component by a static analysis of a component intermediate-grid finite-element-model of the component, identifying hot spot locations in the component intermediate-grid finite-element-model by performing a fatigue screening on the component, generating details for the component intermediate-grid finite-element-model based on the hot spot locations, and predicting crack results by a deterministic durability-and-damage-tolerance analysis of the details for a component fine-grid finite-element-model of the component, calculating a crack margins for the component fine-grid finite-element-model by a probabilistic durability-and-damage-tolerance analysis of the crack results, and generating an output file that contains the final crack initiation margin and the final crack growth margin.

The invention discloses a Solidworks model-based machining program generation method and system, and belongs to the technical field of computer-aided manufacturing, and the method comprises the steps: S1, analyzing the modeling features of each part in a Solidworks model, carrying out the matching analysis of the modeling feature sketch contour and sketch plane normal vector with a feature library, obtaining a machining feature category, and carrying out the recognition of the machining feature category; performing feature grouping according to the processing feature category and the processing direction; s2, identifying and extracting the part size and tolerance marked in the sketch; s3, analyzing a part machining process based on the machining feature category, the part size and the tolerance; s4, the blank type, machining allowance distribution, machining steps and a clamping mode are determined; s5, the three-dimensional space coordinates of the machining contour are converted into machine tool machining coordinates, and machining information is sequenced; s6, the machining path of the part machining technology is calculated; and S7, according to the machining path, combining with an instruction supported by a specific machine tool, performing post-processing to generate a G code.

The invention discloses a high-frequency transformer transmission extreme value frequency rapid calibration and tolerance analysis method, which comprises the following steps of collecting operation parameters of a high-frequency transformer in real time, performing standardized preprocessing, and integrating the preprocessed parameters to construct operation condition vectors in a unified format; defining a frequency response range of the high-frequency transformer, constructing a frequency search space based on the frequency response range, and establishing a target function for fitness evaluation based on the frequency search space; searching extreme value frequency points in the frequency search space by adopting a quantum evolutionary algorithm; based on the working condition vector and the extreme value frequency point, a working condition frequency deviation prediction model is constructed, and the working condition frequency deviation prediction model outputs an extreme value frequency shift offset; and calculating the dynamic tolerance bandwidth according to the predicted offset and the fluctuation range of the working condition vector. According to the invention, rapid and accurate calibration of the extreme value frequency of the high-frequency transformer and dynamic determination of the tolerance range can be realized.

The invention relates to the technical field of vehicle braking control, in particular to a self-adaptive error tolerance automatic emergency braking system and method, and provides a self-adaptive error tolerance automatic emergency braking system and a forward collision early warning system. The method aims at solving the accuracy problem caused by sensor errors in an existing system. The method specifically comprises the following steps: introducing a first-order error propagation model to quantify a key safety index error; comprising the steps of collision time real-time estimation based on a forward sensor, error propagation and tolerance analysis and FCW / AEB trigger logic design introducing a fault-tolerant band. In the design, the maximum tolerance error is set, and the sensor index requirement is reversely deduced, so that the robustness and safety of the system are improved, a quantifiable fault-tolerant boundary is provided for the AEB system, the application effect of the system in a complex road environment is improved, and the method is particularly suitable for high-risk scenes such as expressways and urban expressways and has wide application prospects. And the fault-tolerant capability and the practical application effect of the system are enhanced.

The invention relates to the technical field of environment adaptability testing, and discloses an identification key performance comprehensive environment adaptability testing system. The system comprises a multi-environment factor acquisition and processing module for acquiring data and performing normalization preprocessing; the environment scene dynamic modeling module is used for constructing a multi-dimensional association graph and updating a topological structure; the performance index evaluation module evaluates a performance degradation index in a composite environment by means of a spatial-temporal feature fusion algorithm; the failure mode prediction module is used for generating a potential failure mode under multi-environment coupling according to the performance degradation trend and the stress accumulation effect; the environment tolerance analysis module is used for integrating data to establish a virtual model and outputting a tolerance residual error of a specific environment section; the test scheme optimization module is used for generating a self-adaptive test sequence according to the residual error and the map; and the environment scene simulation control module is used for regulating and controlling parameters of the test cabin in combination with multiple information. The system can comprehensively and accurately evaluate the performance and endurance capability of equipment in a composite environment, and has a dynamic adjustment characteristic.

The invention provides a non-contact measurement-oriented three-dimensional point AI registration and tolerance analysis method and system, and relates to the field of three-dimensional point AI registration and tolerance analysis, and the method comprises the steps: synchronously collecting point cloud data through multiple sensors, and carrying out the adaptive preprocessing, and obtaining a preprocessed point cloud pair; constructing a multi-scale geometric descriptor by using a local curvature and a normal vector, and performing multi-scale hierarchical feature extraction to obtain an enhanced point feature set; calculating a bidirectional matching probability matrix by using an optimal transmission theory, screening high-confidence point pairs through spatial compatibility constraint to obtain a high-confidence matching point pair set and a matching score, performing transformation matrix estimation and quantification uncertainty, and outputting optimal rigid body transformation and a covariance matrix thereof; self-adaptive optimization is executed in a layered mode, the search range is dynamically adjusted, transformation parameters are verified in a cross-scale mode, and a convergent accurate registration result is output. The method is used for overcoming the defect that in the prior art, low-overlapping-rate registration precision is low.

The invention relates to the technical field of assembly tolerance analysis and optimization based on Monte Carlo simulation, discloses an assembly tolerance analysis and optimization method and system based on Monte Carlo simulation, and provides an assembly tolerance analysis and optimization method and system based on Monte Carlo simulation. The invention provides an assembly tolerance analysis and optimization method and system based on Monte Carlo simulation, and the method comprises the steps: carrying out the explicit modeling of the deformation response of a flexible part as a node control point displacement vector, and constructing an error propagation structure expression model through combining a dimension chain topological structure; accurate expression and transfer modeling of flexible response and error coupling in a complex assembly path are achieved, and the problem of error propagation distortion caused by neglecting flexible deformation or simplifying modeling in a traditional method is effectively solved.

The present invention belongs to the technical field of antenna arrays, and specifically relates to a method for tolerance analysis of array power patterns with position errors. The present invention proposes a technique based on Taylor expansion, which is used for tolerance analysis of array power patterns with array element position errors, and derives the upper and lower limits of the array power pattern affected by the position error in an analytical form. Since the proposed technique only involves the first-order partial derivative of the position variable and the position disturbance, it has the advantages of easy implementation and unconditional judgment. After example verification, compared with interval arithmetic, the power pattern boundary calculated by Taylor expansion has higher reliability and robustness, and at the same time effectively improves the prediction performance of the pattern performance parameter boundary. The relevant results can provide a certain theoretical reference for the practice of antenna arrays in engineering.

The invention discloses a crack tolerance analysis method for a saddle-shaped welding seam of an integral reinforcing connecting pipe of nuclear pressure-bearing equipment, and belongs to the technical field of reliability. The method comprises the following steps: firstly, establishing a three-dimensional model containing a crack structure and defining crack parameters; carrying out finite element analysis after applying a load; and the critical crack size is determined by iteratively adjusting the crack depth in the failure evaluation diagram. Carrying out sampling analysis by taking the load and the material parameters as random variables to obtain a critical crack size set; and finally, the failure probability reaches a target allowable value by adjusting a crack detection threshold value of nondestructive testing. According to the method, finite element simulation is carried out, the critical crack size of the saddle-shaped welding seam of the integral reinforcing connecting pipe of the pressure-bearing equipment under the complex load is checked based on a failure evaluation icon, the relation between the critical crack size and the allowable crack size is established by assuming that the crack size detected by nondestructive testing obeys normal distribution, and the test efficiency is improved while the number of experiments is reduced. And the reliability of a calculation result is ensured.

A computer-implemented method includes obtaining an electronic design of a part geometry for a part for additive manufacturing; obtaining datum information indicating a sequence of one or more datums for the part geometry, obtaining a electronic scan mapping of an object additively manufactured according to the electronic design of the part geometry; sequentially aligning the electronic scan mapping to the electronic design of the part geometry according to the sequence of one or more datums indicated in the datum information; generating a deviation profile based on the alignment of the aligning the electronic scan mapping to the electronic design of the part geometry according to the sequence of one or more datums indicated in the datum information. The electronic design of the part geometry is adjusted based on the deviation profile to compensate for distortion. A further part can be manufactured based on the adjusted electronic design.

The application provides a three-dimensional point AI registration and tolerance analysis method and system for non-contact measurement, relates to the field of three-dimensional point AI registration and tolerance analysis, and comprises the following steps: synchronously collecting point cloud data through a plurality of sensors, and performing adaptive preprocessing to obtain a preprocessed point cloud pair; using local curvature and normal vectors to construct a multi-scale geometric descriptor, and performing multi-scale hierarchical feature extraction to obtain an enhanced point feature set; calculating a bidirectional matching probability matrix by using optimal transport theory, screening high-confidence point pairs through spatial compatibility constraints, obtaining a high-confidence matching point pair set and a matching score, performing transformation matrix estimation and quantitative uncertainty, and outputting an optimal rigid transformation and a covariance matrix; and performing adaptive optimization in layers, dynamically adjusting a search range, and verifying transformation parameters across scales to output a converged accurate registration result. The application is used to solve the defect of low registration accuracy at a low overlap rate in the prior art.

The invention discloses a loading control method and system for a loader based on error margin, and the method comprises the steps: collecting the calibration error and operation error of a sensor, and constructing an error margin model; on the basis of the error margin model, the loading margin is calculated, and the margin space of a loading path is expanded; planning a control path of the loader bucket based on a self-adaptive PID control algorithm, and outputting an actual moving distance of the loader bucket; the position of the loader bucket is monitored in real time through a laser radar, and fine adjustment control or repeated filling operation is triggered. According to the method, modeling and tolerance analysis are carried out on sensor errors in a control strategy, the robustness and reliability of loading actions are improved by establishing an error margin model and introducing a margin compensation strategy in path planning and control output, it is ensured that under the condition that the sensor errors exist, it can still be ensured that a loader completely loads materials into a loaded vehicle, and the loading efficiency is improved. The loading precision of the loader is improved, and the material loss is effectively reduced.

The invention relates to the technical field of optical processing, in particular to a method for determining optical processing technological parameters through component manufacturing tolerance distribution, which comprises the following steps of: representing component surface processing errors generated under technological parameters into a characteristic spectrum form, and combining error characteristic spectrums of different technological parameters into a set; and performing tolerance analysis on the error characteristic spectrum and the standard surface of the element in optical design software to obtain a characteristic spectrum needing to be strictly controlled, and comparing the strictly controlled characteristic spectrum with a characteristic spectrum set to obtain the process parameter corresponding to the optimal error characteristic spectrum, namely the optimal process parameter. According to the method, the technical problem that a machining method meeting the tolerance cannot be determined in an existing method is effectively solved, and a theoretical basis is provided for subsequent machining.

The invention discloses a Gaussian beam shaping rod mirror optimization method. The method comprises the following steps: S1, calculating the spatial distribution of laser beams through ray tracing; s2, according to the physical model of the flat-topped light beam, deriving a mapping function relational expression of any light on an incident plane and an emergent plane, and constructing an optimization algorithm evaluation function; s3, performing optimization design on the optical structure of the rod mirror shaping system through a particle swarm optimization algorithm; and S4, evaluating the machinability of the rod mirror shaping system by using tolerance analysis. The processing feasibility of the optical element can be determined, the stability of the shaping system is improved, the design difficulty of the beam shaping system is reduced, and a better beam shaping effect and a higher energy utilization rate are realized.

This invention discloses a method, apparatus, electronic device, and storage medium for predicting tolerances of aircraft structures. The method includes: acquiring first data corresponding to the aircraft structure; wherein the first data includes at least one structural parameter of the aircraft structure; performing tolerance prediction on the first data based on a first model to obtain second data corresponding to the aircraft structure; wherein the second data is tolerance analysis result data of the aircraft structure; and the first model is a neural network model. This technical solution enables efficient and accurate tolerance analysis of aircraft structures, reduces reliance on the experience of analysts, shortens simulation iteration cycles, and reduces application costs.

The present invention relates to the technical field of door interference clearance verification, and specifically to a minimum clearance verification method based on dynamic tolerance analysis, the method comprising the following steps: establishing a basic data model including a vehicle body, a vehicle body end hinge, a vehicle door, a vehicle door end hinge and a virtual positioning fixture; establishing positioning points, assembly points or rotation points on the vehicle body, the vehicle body end hinge, the vehicle door and the vehicle door end hinge that match the connecting parts and the virtual positioning fixture and have tolerances; establishing measurement surfaces on the vehicle door and the vehicle body, and establishing measurement relationships; based on the positioning points, assembly points and rotation points and the basic data model, assembling the vehicle body and the vehicle door, rotating the vehicle door, and obtaining the clearance between the vehicle door and the vehicle body during the rotation process according to the measurement relationship between the measurement surface on the vehicle door and the measurement surface on the vehicle body. The method can solve the problem in the prior art that the output motion trajectory is modeled by a kinematic pair, but the tolerance of each link cannot be input, resulting in the verification result deviating from the actual working condition.

The present application relates to the field of information technology, and discloses a method for evaluating and predicting the adaptability of soft capsules to the environment, which comprises the following steps: generating an environmental risk sequence according to the environmental data and the logistics and storage scene data, and obtaining product tolerance analysis results through simulation analysis; predicting the potential damage probability by using the product tolerance analysis results, and determining the storage adaptability of the target product in the proposed sales area; performing an accelerated aging experiment on a product sample according to the composite environmental stress spectrum, collecting aging-related data, and determining stability indicators; constructing a time series data set, analyzing the coupling relationship and lag effect between different indicators in the time series data set; identifying a key acceleration path according to the analysis results, and correcting a shelf life prediction model; and inputting the environmental stress spectrum of different market areas into the corrected shelf life prediction model to calculate the differentiated shelf life prediction value.

The invention discloses a spline centering optimization method and system, electronic equipment and a storage medium. The spline centering optimization method comprises the following steps: establishing a three-dimensional model of an electric drive system assembly, and defining and creating a measurement target of the coaxiality of a motor rotor shaft spline and a speed reducer input shaft spline; a tolerance analysis model is created through three-dimensional dimension chain calculation, an assembly dimension chain is defined, and part tolerances are configured; tolerance analysis is carried out, and dimensional tolerance and contribution degree of the dimensional tolerance which have great influence on the coaxiality are determined; the highly contributed tolerances are optimized within a process allowable range to improve spline centering. The technical problems that spline centering calculation is complex, and the manual calculation amount is large are solved.

The invention provides an automobile side door assembly dimension chain analysis method, which comprises the following steps of: acquiring models of all parts in an automobile side door assembly area, and importing the models of all the parts into dimension tolerance analysis software; and analyzing an assembly relationship and a spatial constraint relationship among the parts. And the assembly relation of all the parts is analyzed in software. According to the geometric dimension tolerance drawing and the spatial constraint relation, constraint elements of the software are established, and tolerance is given to constraint points according to the drawing. And constructing a virtual tool to restrain the X-axis position and the Z-axis position of the side door on the body-in-white. And according to the assembly relationship and the spatial constraint relationship, performing assembly constraint on each part in the software. A measuring element is established on the side door and the body-in-white at an interval of a preset distance and is used for solving simulation data of dimensional tolerance analysis software. Simulation results are obtained through simulation, dimensional tolerance optimization is carried out according to analysis results, the key control points of the automobile side door assembly area are ranked according to the sensitive factors, and therefore the assembly accuracy can be effectively improved.

The present invention relates to a tolerance analysis method for a computational imaging system based on restored image performance, comprising: constructing a universal optical element machining error model; determining the parameter boundaries of the error model based on a given root mean square value of the machining surface shape error, generating machining error parameters, and importing them into optical design software for ray tracing. The system obtains wave aberrations of each field of view to obtain point spread functions of each field of view, superimposes a noise image to obtain a degraded image, thereby constructing a restored image, and evaluating the MTF values ​​of each field of view of the system, using the machining tolerance limits of each optical element; multiplying the machining tolerance limits of each optical element by a proportionality coefficient Ra, and repeatedly executing the above steps, gradually increasing the proportionality coefficient until the machining error boundaries of each optical element in the system are obtained. Compared with the prior art, the present invention can implement tolerance analysis of computational imaging systems and determine the machining tolerance boundaries of optical elements, which has important guiding significance for the machining of optical elements in the system.

The invention discloses an aviation composite material structure fatigue damage process analysis method and device and a medium, and relates to the technical field of aviation composite material structure fatigue damage tolerance analysis, and the method comprises the steps: employing a Newton-Raphson iteration method to calculate an interface fatigue damage model, obtaining an undamaged numerical flux and a thermodynamic conjugate amount of the undamaged numerical flux, calculating to obtain a fatigue damage threshold and a fatigue fracture threshold according to the undamaged numerical flux and the number of fatigue cycles, and calculating to obtain a fatigue fracture threshold according to the thermodynamic conjugate amount of the undamaged numerical flux, the fatigue damage threshold and the fatigue fracture threshold. And determining a fatigue damage state and a fatigue damage degree, and carrying out iterative updating on model parameters of the interface fatigue damage model according to the fatigue damage state and the fatigue damage degree until the current time step is a termination time step. And the precision and efficiency of aviation composite material structure fatigue failure process analysis can be improved.

The present invention relates to the field of radial gate installation technology and fault diagnosis, and specifically to a radial gate geometric tolerance analysis model based on comprehensive adjustment. The model integrates the posture adjustment of multiple embedded parts to solve the center line of the orifice, takes the intersection of the connecting line of the left and right hinge shaft centers and the center line of the orifice as the coordinate origin, points downstream along the center line of the orifice as the Y axis, and vertically upward as the Z axis. The right-hand system is used to determine the direction of the X axis, thereby establishing a radial gate geometric tolerance analysis coordinate system, wherein the absolute value of the X coordinate represents the distance from the center line of the orifice, the Y coordinate represents the mileage value, and the Z coordinate represents the elevation value. The radial gate geometric tolerance analysis model of the present invention can accurately reproduce the center line of the orifice, and intuitively and efficiently analyze the geometric tolerances of each embedded part.

This invention provides a method for tolerance analysis of the inlet ring clearance of a nuclear power plant main pump. By taking the clearance between the main pump impeller inlet ring and the suction duct as the optimization target and constructing a dimensional chain, and combining 3D modeling and tolerance analysis software, the method achieves precise definition of assembly relationships and tolerance parameters. At the same time, it introduces rotor dynamics deflection deformation calculation and conditional assembly logic, which can truly reflect the tolerance accumulation law of the main pump under 3D assembly and operating conditions. This significantly improves the accuracy and reliability of clearance tolerance analysis, effectively avoids the risk of rotor rubbing during operation, reduces testing and assembly costs, and thus ensures the long-term safe and stable operation of the nuclear power plant main pump.

The invention relates to a weighted MTF (Modulation Transfer Function)-based tolerance analysis method for an optical-digital combined system, and aims to solve the technical problem that the reliability of a tolerance range obtained by tolerance analysis is relatively low because an evaluation result highly depends on a test scene due to the fact that an image quality evaluation index is not objective enough in the prior art. Monte Carlo experiments based on full-band weighted MTF in the Nyquist frequency are performed on the surface shape error, the installation and adjustment eccentricity error and the installation and adjustment inclination error of the free-form surface optical element respectively, critical values of all tolerances are found out, the critical values of all the tolerances are zoomed through zooming coefficients, the experiments are repeated, and the free-form surface optical element is obtained. And finally determining a critical value of each tolerance item.

The present invention relates to the field of optical processing technology, and in particular to a method for determining optical processing parameters by allocating component manufacturing tolerances. The method characterizes the component surface processing errors generated under the process parameters in the form of characteristic spectra, forms a set of error characteristic spectra of different process parameters, and performs tolerance analysis on the error characteristic spectra together with the component standard surface in optical design software to obtain a characteristic spectrum that requires strict control. The strictly controlled characteristic spectrum is compared with the characteristic spectrum set, and the process parameters corresponding to the optimal error characteristic spectrum are obtained, which are the optimal process parameters. The present invention effectively solves the technical problem that the existing method cannot determine a processing method that meets the tolerance, and provides a theoretical basis for subsequent processing.

The invention relates to an analysis method for calculating the tolerance of an imaging system based on restored image performance. The method comprises the following steps: constructing a general optical element processing error model; determining a parameter boundary of an error model and generating a processing error parameter based on a given root-mean-square value of a processing surface shape error, importing the parameter into optical design software for ray tracing, acquiring wave aberration of each field of view of the system to obtain point spread functions of each field of view, and superposing a noise image to obtain a degraded image so as to construct a restored image; evaluating the MTF value of each field of view of the system to obtain the machining tolerance limit of each optical element; and multiplying the machining tolerance limit of each optical element by the proportionality coefficient Ra, circularly executing the steps, and gradually increasing the proportionality coefficient until the machining error boundary of each optical element of the system is obtained. Compared with the prior art, the tolerance analysis of the imaging system can be calculated, the machining tolerance boundary of the optical element is determined, and the method has important guiding significance on machining of the optical element in the system.

The invention relates to an automobile tail lamp DTS size design method, which comprises the following steps: firstly, obtaining a positioning strategy and a manufacturing tolerance of a target part, and obtaining a preliminary DTS tolerance in combination with tolerance analysis software; inputting the initial DTS tolerance into a whole vehicle appearance visual model to obtain a whole vehicle appearance DTS manufacturing state; in the above process, the whole vehicle appearance DTS manufacturing state, namely the visual effect of the vehicle appearance size, can be directly obtained, so that whether the whole vehicle appearance DTS manufacturing state meets the requirement or not is recognized in advance in the design stage, and the design efficiency is improved. The situation that in the real vehicle stage, appearance defects are recognized and rectified is avoided, DTS evaluation work is directly preposed, and the DTS evaluation work and a design link are synchronously carried out; by means of the mode, the DTS problem is recognized in advance, and the period and cost of industrial rectification are greatly reduced; and the product maturity is improved.

The invention relates to the technical field of storage box assembly, in particular to an additive manufacturing storage box assembly method based on digital twinning. The embodiment of the invention provides an additive manufacturing storage box assembly method based on digital twinning, which comprises the following steps: carrying out three-dimensional scanning on storage box parts obtained by 3D printing to obtain point cloud data of an actual geometric model; comparing the point cloud data with an original CAD design model to generate a digital twin representing manufacturing deviation; importing the digital twin and mating part model into an assembly simulation environment, simulating an assembly process, analyzing to obtain an assembly problem, performing tolerance analysis on the assembly problem, and evaluating the influence of manufacturing tolerance on the performance of an assembly; and generating an optimized processing scheme according to the assembly problem and the evaluation result. The embodiment of the invention provides an additive manufacturing storage box assembling method based on digital twinning. The storage box can be assembled in a high-precision mode.

The invention relates to the technical field of optical instrument design, and discloses a line-distance-variable grating spectrometer performance and tolerance collaborative optimization method, a spectrometer, a system, a terminal and a medium, and the method comprises the steps: constructing a performance evaluation function of the spectrometer; determining an optimization variable, and obtaining a target optimization result meeting requirements according to the performance evaluation function and the optimization variable; performing tolerance analysis according to the target optimization result to obtain an evaluation result; and determining a design result of the spectrometer according to the evaluation result. According to the method, a strict ray tracing method is adopted to replace an approximation formula, the calculation precision is improved, high performance is pursued, and meanwhile it is ensured that the design scheme has the high yield under existing machining and assembling tolerances.

The invention relates to the technical field of miter gate manufacturing quality evaluation, in particular to a miter gate manufacturing quality geometric tolerance analysis method based on a center line up-drawing device, which comprises the following steps of: acquiring three-dimensional coordinates of main components of a miter gate based on the center line up-drawing device and a total station; the center line upward guiding device comprises a fixing part, a coarse adjustment part, a horizontal fine adjustment base, a vertical fine adjustment base, a transmission part, a leveling device and an aligning device. Based on the collected three-dimensional coordinates, a miter gate geometric tolerance analysis model is established with the center line of the bottom cross beam and the center line of the gate leaf as the benchmark; and analyzing the geometric quality of the miter gate based on the miter gate geometric tolerance analysis model. According to the invention, efficient acquisition and accurate analysis of parameters such as the width of the gate body, the straightness of the door shaft column and the beveled connection column are realized, data acquisition is more efficient, data analysis is more accurate, and the manufacturing precision of the miter gate and the reliability of an analysis result are effectively improved.