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Inverse approach to determine piston profile from impact stress waveform on given non-uniform rod 被引量:1
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作者 朱萍玉 刘德顺 +1 位作者 彭佑多 陈安华 《中国有色金属学会会刊:英文版》 CSCD 2001年第2期297-300,共4页
An essential problem in the design of mechanical impact systems is the impact of a piston on a rod. The impact of a semi finite cylindrical piston on a non uniform rod was studied. Based on wave mechanics and characte... An essential problem in the design of mechanical impact systems is the impact of a piston on a rod. The impact of a semi finite cylindrical piston on a non uniform rod was studied. Based on wave mechanics and characteristic line theory, an inverse numerical approach to determine the piston profile was proposed, by means of which the geometry of an impact piston may be determined from the given stress waveform for a given rod profile. Numerical results show that the given stress waveform may be produced by means of the alternatives of design of piston and rod. There is good agreement between the experimental results and numerical results. [ 展开更多
关键词 impact PISTON PROFILE NON-UNIFORM ROD inverse numerical approach stress WAVEFORM
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IDENTIFICATION OF ELASTIC-PLASTIC MECHANICAL PROPERTIES FOR BIMETALLIC SHEETS BY HYBRID-INVERSE APPROACH 被引量:2
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作者 Honglei Zhang Xuehui Lin +2 位作者 Yanqun Wang Qian Zhang Yilan Kang 《Acta Mechanica Solida Sinica》 SCIE EI 2010年第1期29-35,共7页
Analysis, evaluation and interpretation of measured signals become important components in engineering research and practice, especially for material characteristic parameters which can not be obtained directly by exp... Analysis, evaluation and interpretation of measured signals become important components in engineering research and practice, especially for material characteristic parameters which can not be obtained directly by experimental measurements. The present paper proposes a hybrid-inverse analysis method for the identification of the nonlinear material parameters of any individual component from the mechanical responses of a global composite. The method couples experimental approach, numerical simulation with inverse search method. The experimental approach is used to provide basic data. Then parameter identification and numerical simulation are utilized to identify elasto-plastic material properties by the experimental data obtained and inverse searching algorithm. A numerical example of a stainless steel clad copper sheet is consid- ered to verify and show the applicability of the proposed hybrid-inverse method. In this example, a set of material parameters in an elasto-plastic constitutive model have been identified by using the obtained experimental data. 展开更多
关键词 identification of parameters hybrid-inverse approach elasto-plastic mechanical properties of bimetallic sheets
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Similarity measure of sedimentary successions and its application in inverse stratigraphic modeling 被引量:6
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作者 Taizhong Duan 《Petroleum Science》 SCIE CAS CSCD 2017年第3期484-492,共9页
This paper presents a unique and formal method of quantifying the similarity or distance between sedimentary facies successions from measured sections in outcrop or drilled wells and demonstrates its first application... This paper presents a unique and formal method of quantifying the similarity or distance between sedimentary facies successions from measured sections in outcrop or drilled wells and demonstrates its first application in inverse stratigraphic modeling. A sedimentary facies succession is represented with a string of symbols, or facies codes in its natural vertical order, in which each symbol brings with it one attribute such as thickness for the facies. These strings are called attributed strings. A similarity measure is defined between the attributed strings based on a syntactic pattern-recognition technique. A dynamic programming algorithm is used to calculate the similarity. Inverse stratigraphic modeling aims to generate quantitative 3D facies models based on forward stratigraphic modeling that honors observed datasets. One of the key techniques in inverse stratigraphic modeling is how to quantify the similarity or distance between simulated and observed sedimentary facies successions at data locations in order for the forward model to condition the simulation results to the observed dataset such as measured sections or drilled wells. This quantification technique comparing sedimentary successions is demonstrated in the form of a cost function based on the defined distance in our inverse stratigraphic modeling implemented with forward modeling optimization. 展开更多
关键词 Similarity quantification Sedimentarysuccession inverse stratigraphic modeling Globaloptimilization Syntactic approach
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Two optimization algorithms for solving robotics inverse kinematics with redundancy 被引量:5
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作者 Jianxin XU, Wei WANG, Yuanguang SUN (Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576) 《控制理论与应用(英文版)》 EI 2010年第2期166-175,共10页
The kinematic redundancy in a robot leads to an infinite number of solutions for inverse kinematics, which implies the possibility to select a 'best' solution according to an optimization criterion. In this pa... The kinematic redundancy in a robot leads to an infinite number of solutions for inverse kinematics, which implies the possibility to select a 'best' solution according to an optimization criterion. In this paper, two optimization objective functions are proposed, aiming at either minimizing extra degrees of freedom (DOFs) or minimizing the total potential energy of a multilink redundant robot. Physical constraints of either equality or inequality types are taken into consideration in the objective functions. Since the closed-form solutions do not exist in general for highly nonlinear and constrained optimization problems, we adopt and develop two numerical methods, which are verified to be effective and precise in solving the two optimization problems associated with the redundant inverse kinematics. We first verify that the well established trajectory following method can precisely solve the two optimization problems, but is computation intensive. To reduce the computation time, a sequential approach that combines the sequential quadratic programming and iterative Newton-Raphson algorithm is developed. A 4-DOF Fujitsu Hoap-1 humanoid robot arm is used as a prototype to validate the effectiveness of the proposed optimization solutions. 展开更多
关键词 inverse kinematics Redundant robot Objective function OPTIMIZATION Numerical approach
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Design for a Crane Metallic Structure Based on Imperialist Competitive Algorithm and Inverse Reliability Strategy 被引量:6
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作者 Xiao-Ning Fan Bo Zhi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2017年第4期900-912,共13页
Uncertainties in parameters such as materials, loading, and geometry are inevitable in designing metallic structures for cranes. When considering these uncertainty factors, reliability-based design optimization (RBDO... Uncertainties in parameters such as materials, loading, and geometry are inevitable in designing metallic structures for cranes. When considering these uncertainty factors, reliability-based design optimization (RBDO) offers a more reasonable design approach. However, existing RBDO methods for crane metallic structures are prone to low convergence speed and high computational cost. A unilevel RBDO method, combining a discrete imperialist competitive algorithm with an inverse reliabil- ity strategy based on the performance measure approach, is developed. Application of the imperialist competitive algorithm at the optimization level significantly improves the convergence speed of this RBDO method. At the reli- ability analysis level, the inverse reliability strategy is used to determine the feasibility of each probabilistic constraint at each design point by calculating its a-percentile per- formance, thereby avoiding convergence failure, calcula- tion error, and disproportionate computational effort encountered using conventional moment and simulation methods. Application of the RBDO method to an actual crane structure shows that the developed RBDO realizes a design with the best tradeoff between economy and safety together with about one-third of the convergence speed and the computational cost of the existing method. This paper provides a scientific and effective design approach for the design of metallic structures of cranes. 展开更多
关键词 Crane metallic structure Reliability-baseddesign optimization Imperialist competitive algorithmPerformance measure approach inverse reliabilitystrategy
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Comparison of deterministic and stochastic approaches to crosshole seismic travel-time inversions
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作者 YanZhe Zhao YanBin Wang 《Earth and Planetary Physics》 CSCD 2019年第6期547-559,共13页
The Bayesian inversion method is a stochastic approach based on the Bayesian theory.With the development of sampling algorithms and computer technologies,the Bayesian inversion method has been widely used in geophysic... The Bayesian inversion method is a stochastic approach based on the Bayesian theory.With the development of sampling algorithms and computer technologies,the Bayesian inversion method has been widely used in geophysical inversion problems.In this study,we conduct inversion experiments using crosshole seismic travel-time data to examine the characteristics and performance of the stochastic Bayesian inversion based on the Markov chain Monte Carlo sampling scheme and the traditional deterministic inversion with Tikhonov regularization.Velocity structures with two different spatial variations are considered,one with a chessboard pattern and the other with an interface mimicking the Mohorovicicdiscontinuity(Moho).Inversions are carried out with different scenarios of model discretization and source–receiver configurations.Results show that the Bayesian method yields more robust single-model estimations than the deterministic method,with smaller model errors.In addition,the Bayesian method provides the posterior probabilistic distribution function of the model space,which can help us evaluate the quality of the inversion result. 展开更多
关键词 stochastic approach DETERMINISTIC approach Bayesian inversion MARKOV Chain MONTE Carlo Tikhonov REGULARIZATION
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Cross-section distortion and springback characteristics of double-cavity aluminum profile in force controlled stretch-bending
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作者 Zhi-wen LIU Zi-xuan DONG +2 位作者 Cong-chang XU Jie YI Luo-xing LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2476-2490,共15页
3D elastic-plastic FE model for simulating the force controlled stretch-bending process of double-cavity aluminum profile was established using hybrid explicit−implicit solvent method.Considering the computational acc... 3D elastic-plastic FE model for simulating the force controlled stretch-bending process of double-cavity aluminum profile was established using hybrid explicit−implicit solvent method.Considering the computational accuracy and efficiency,the optimal choices of numerical parameters and algorithms in FE modelling were determined.The formation mechanisms of cross-section distortion and springback were revealed.The effects of pre-stretching,post-stretching,friction,and the addition of internal fillers on forming quality were investigated.The results show that the stress state of profile in stretch-bending is uniaxial with only a circumferential stress.The stress distribution along the length direction of profile is non-uniform and the maximum tensile stress is located at a certain distance away from the center of profile.As aluminum profile is gradually attached to bending die,the distribution characteristic of cross-section distortion along the length direction of profile changes from V-shape to W-shape.After unloading the forming tools,cross-section distortion decreases obviously due to the stress relaxation,with a maximum distortion difference of 13%before and after unloading.As pre-stretching and post-stretching forces increase,cross-section distortion increases gradually,while springback first decreases and then remains unchanged.With increasing friction between bending die and profile,cross-section distortion slightly decreases,while springback increases.Cross-section distortion decreases by 83%with adding PVC fillers into the cavities of profile,while springback increases by 192.2%. 展开更多
关键词 hollow aluminum profile force controlled stretch-bending numerical parameters springback analysis approach cross-section distortion springback process parameters
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Analysis of radial basis function interpolation approach 被引量:4
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作者 邹友龙 胡法龙 +3 位作者 周灿灿 李潮流 李长喜 Keh-Jim Dunn 《Applied Geophysics》 SCIE CSCD 2013年第4期397-410,511,共15页
The radial basis function (RBF) interpolation approach proposed by Freedman is used to solve inverse problems encountered in well-logging and other petrophysical issues. The approach is to predict petrophysical prop... The radial basis function (RBF) interpolation approach proposed by Freedman is used to solve inverse problems encountered in well-logging and other petrophysical issues. The approach is to predict petrophysical properties in the laboratory on the basis of physical rock datasets, which include the formation factor, viscosity, permeability, and molecular composition. However, this approach does not consider the effect of spatial distribution of the calibration data on the interpolation result. This study proposes a new RBF interpolation approach based on the Freedman's RBF interpolation approach, by which the unit basis functions are uniformly populated in the space domain. The inverse results of the two approaches are comparatively analyzed by using our datasets. We determine that although the interpolation effects of the two approaches are equivalent, the new approach is more flexible and beneficial for reducing the number of basis functions when the database is large, resulting in simplification of the interpolation function expression. However, the predicted results of the central data are not sufficiently satisfied when the data clusters are far apart. 展开更多
关键词 inverse problems radial basis function interpolation new approach
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Dynamic multifunctional metasurfaces:an inverse design deep learning approach
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作者 ZHI-DAN LEI YI-DUO XU +2 位作者 CHENG LEI YAN ZHAO DU WANG 《Photonics Research》 SCIE EI CAS CSCD 2024年第1期123-133,共11页
Optical metasurfaces(OMs)offer unprecedented control over electromagnetic waves,enabling advanced optical multiplexing.The emergence of deep learning has opened new avenues for designing OMs.However,existing deep lear... Optical metasurfaces(OMs)offer unprecedented control over electromagnetic waves,enabling advanced optical multiplexing.The emergence of deep learning has opened new avenues for designing OMs.However,existing deep learning methods for OMs primarily focus on forward design,which limits their design capabilities,lacks global optimization,and relies on prior knowledge.Additionally,most OMs are static,with fixed functionalities once processed.To overcome these limitations,we propose an inverse design deep learning method for dynamic OMs.Our approach comprises a forward prediction network and an inverse retrieval network.The forward prediction network establishes a mapping between meta-unit structure parameters and reflectance spectra.The inverse retrieval network generates a library of meta-unit structure parameters based on target requirements,enabling end-to-end design of OMs.By incorporating the dynamic tunability of the phase change material Sb2Te3with inverse design deep learning,we achieve the design and verification of dynamic multifunctional OMs.Our results demonstrate OMs with multiple information channels and encryption capabilities that can realize multiple physical field optical modulation functions.When Sb2Te3is in the amorphous state,near-field nano-printing based on meta-unit amplitude modulation is achieved for X-polarized incident light,while holographic imaging based on meta-unit phase modulation is realized for circularly polarized light.In the crystalline state,the encrypted information remains secure even with the correct polarization input,achieving double encryption.This research points towards ultra-compact,high-capacity,and highly secure information storage approaches. 展开更多
关键词 POLARIZATION inverse approach
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基于迭代自适应的短孔径逆合成孔径雷达成像方法
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作者 张蓓 周波 +2 位作者 白昊 石川 王雷钢 《系统仿真技术》 2024年第1期91-95,共5页
针对合成孔径时间短、逆合成孔径雷达数据成像质量差的问题,本研究提出一种基于迭代自适应恢复缺失数据(missing-data iterative adaptive processing approach,MIAA)的短孔径数据的逆合成孔径雷达(inverse synthetic aperture radar,IS... 针对合成孔径时间短、逆合成孔径雷达数据成像质量差的问题,本研究提出一种基于迭代自适应恢复缺失数据(missing-data iterative adaptive processing approach,MIAA)的短孔径数据的逆合成孔径雷达(inverse synthetic aperture radar,ISAR)超分辨率成像方法。该方法利用MIAA对ISAR回波数据的方位向进行扩展,从而增加数据的方位向长度,提高成像质量。仿真和实测均表明该方法能够有效扩展回波数据的方位向长度,提高短孔径条件下的成像质量。 展开更多
关键词 雷达 逆合成孔径雷达 短孔径 超分辨率成像 迭代自适应方法
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Two 3-D multi-cascade co-design inverse methods based on streamline curvature approach and Clebsch formulation for single-stage centrifugal compressors 被引量:1
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作者 TIAN Xiao-pei SHAN Peng 《航空动力学报》 EI CAS CSCD 北大核心 2013年第7期1526-1538,共13页
Two strategies extended the single-cascade methods from a compressible three-dimensional inverse method for radial and mixed flow turbomachines to two three-dimensional multi-cascade co-design methods for single-stage... Two strategies extended the single-cascade methods from a compressible three-dimensional inverse method for radial and mixed flow turbomachines to two three-dimensional multi-cascade co-design methods for single-stage centrifugal compressors.These two three-dimensional methods and a typical quasi-threedimensional streamline curvature through-flow inverse method were employed to design the same subsonic high-speed single-stage centrifugal compressors.The compressor performances were simulated by a commercial Reynolds averaged Navier-Stokes(RANS) equations solver.The studies show that two three-dimensional codesign methods are reasonable and feasible.It was found that : firstly the blade camber angle designed by the three-dimensional methods was larger than that designed by the quasi-three-dimensional method;and secondly with regard to two three-dimensional methods with different boundary conditions,the co-design result differences between the diffusers were small,but those between the deswirlers were relatively large. 展开更多
关键词 centrifugal compressor through-flow inverse method three-dimensional inverse problem streamline curvature approach Clebsch formulation multi-cascade co-design
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High-precision inverse potentials for neutron-proton scattering using piece-wise smooth Morse functions
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作者 Ayushi Awasthi Arushi Sharma +1 位作者 Ishwar Kant O.S.K.S.Sastri 《Chinese Physics C》 SCIE CAS CSCD 2024年第10期201-213,共13页
The aim of this study is to construct inverse potentials for various ℓ-channels of neutron-proton scattering using a piece-wise smooth Morse function as a reference.The phase equations for single-channel states and th... The aim of this study is to construct inverse potentials for various ℓ-channels of neutron-proton scattering using a piece-wise smooth Morse function as a reference.The phase equations for single-channel states and the coupled equations of multi-channel scattering are solved numerically using the 5^(th) order Runge-kutta method.We employ a piece-wise smooth reference potential comprising three Morse functions as the initial input.Leveraging a machine learning-based genetic algorithm,we optimize the model parameters to minimize the mean-squared error between simulated and anticipated phase shifts.Our approach yields inverse potentials for both single and multichannel scattering,achieving convergence to a mean-squared error≤10^(-3).The resulting scattering lengths"a_(0)"and effective ranges"r"for ^(3)S_(1) and ^(1)S_(0) states,expressed as[a_(0),r],are found to be[5.445(5.424),1.770(1.760)]and[–23.741(–23.749),2.63(2.81)],respectively;these values are in excellent agreement with experimental ones.Furthermore,the calculated total scattering cross-sections are highly consistent with their experimental counterparts,having a percentage error of less than 1%.This computational approach can be easily extended to obtain interaction potentials for charged particle scattering. 展开更多
关键词 inverse potentials neutron-proton scattering piece-wise smooth Morse function phase function method reference potential approach genetic algorithm
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Inverse Scattering Transform of the Coupled Sasa–Satsuma Equation by Riemann–Hilbert Approach 被引量:1
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作者 吴建平 耿献国 《Communications in Theoretical Physics》 SCIE CAS CSCD 2017年第5期527-534,共8页
The inverse scattering transform of a coupled Sasa–Satsuma equation is studied via Riemann–Hilbert approach. Firstly, the spectral analysis is performed for the coupled Sasa–Satsuma equation, from which a Riemann–... The inverse scattering transform of a coupled Sasa–Satsuma equation is studied via Riemann–Hilbert approach. Firstly, the spectral analysis is performed for the coupled Sasa–Satsuma equation, from which a Riemann–Hilbert problem is formulated. Then the Riemann–Hilbert problem corresponding to the reflection-less case is solved.As applications, multi-soliton solutions are obtained for the coupled Sasa–Satsuma equation. Moreover, some figures are given to describe the soliton behaviors, including breather types, single-hump solitons, double-hump solitons, and two-bell solitons. 展开更多
关键词 inverse scattering transform Riemann–Hilbert approach coupled Sasa–Satsuma equation soliton solution
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先进高强度双相钢弯扭复合回弹补偿控制研究
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作者 李洪周 冯阳阳 +1 位作者 张文广 李屹萌 《塑性工程学报》 CAS CSCD 北大核心 2024年第2期76-85,共10页
针对先进高强度双相钢弯扭复合回弹的预测与补偿问题,在弯扭复合回弹试验的基础上建立了有限元模型并进行了仿真模拟。首先,利用DP600材料在弯扭复合回弹试验中回弹量较大的特点,进行了单向拉伸试验和加载-卸载-反向加载的拉压试验以测... 针对先进高强度双相钢弯扭复合回弹的预测与补偿问题,在弯扭复合回弹试验的基础上建立了有限元模型并进行了仿真模拟。首先,利用DP600材料在弯扭复合回弹试验中回弹量较大的特点,进行了单向拉伸试验和加载-卸载-反向加载的拉压试验以测定DP600的力学特性。其次,分别采用Ls-dyna提供的4种弹塑性材料模型建立了单向拉伸和拉压试验有限元模型,通过Ls-opt迭代求解筛选出合适的材料模型及参数,结果表明,采用MAT125材料模型预测的数值更接近弯扭复合回弹试验数据。最后,通过反向截面补偿法推导出底部支撑距离移动公式,通过反向位移补偿法和偏置曲面得到模具面,对弯扭复合回弹结果分别进行补偿。发现利用反向位移补偿法,并通过偏置曲面的方式,能够对在上压杆偏转角度增加时诱发的弯扭复合回弹进行有效补偿控制。 展开更多
关键词 先进高强度双相钢 弯扭复合回弹 本构模型 参数反求 回弹补偿
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联合均值和散度逆高斯回归模型的参数估计
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作者 张露露 黄希芬 《统计与决策》 CSSCI 北大核心 2024年第9期49-54,共6页
逆高斯回归模型可用于分析正偏态数据,人们通常研究解释变量对其均值参数的影响,但往往忽略了对其散度参数的影响,文章则基于解释变量对均值和散度都有影响的前提,针对联合均值和散度逆高斯回归模型,探讨模型参数的极大似然估计问题。M... 逆高斯回归模型可用于分析正偏态数据,人们通常研究解释变量对其均值参数的影响,但往往忽略了对其散度参数的影响,文章则基于解释变量对均值和散度都有影响的前提,针对联合均值和散度逆高斯回归模型,探讨模型参数的极大似然估计问题。MM算法在优化问题上具有分离参数、降低目标函数的维度、简化求解过程等优点,将MM算法应用于联合均值和散度逆高斯回归模型,能将多元似然函数彻底分解为一系列一元函数之和,从而绕开了参数估计中的矩阵求逆问题。模拟研究表明,当数据量达到100时就能得到很好的估计效果;实证分析表明,理论研究在实际应用中具有可行性。 展开更多
关键词 逆高斯分布 MM算法 参数分离 BOOTSTRAP方法
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Convergence analysis of an incremental approach to online inverse reinforcement learning
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作者 Zhuo-jun JIN Hui QIAN Shen-yi CHEN Miao-liang ZHU 《Journal of Zhejiang University-Science C(Computers and Electronics)》 SCIE EI 2011年第1期17-24,共8页
Interest in inverse reinforcement learning (IRL) has recently increased,that is,interest in the problem of recovering the reward function underlying a Markov decision process (MDP) given the dynamics of the system and... Interest in inverse reinforcement learning (IRL) has recently increased,that is,interest in the problem of recovering the reward function underlying a Markov decision process (MDP) given the dynamics of the system and the behavior of an expert.This paper deals with an incremental approach to online IRL.First,the convergence property of the incremental method for the IRL problem was investigated,and the bounds of both the mistake number during the learning process and regret were provided by using a detailed proof.Then an online algorithm based on incremental error correcting was derived to deal with the IRL problem.The key idea is to add an increment to the current reward estimate each time an action mismatch occurs.This leads to an estimate that approaches a target optimal value.The proposed method was tested in a driving simulation experiment and found to be able to efficiently recover an adequate reward function. 展开更多
关键词 Incremental approach Reward recovering Online learning inverse reinforcement learning Markov decision process
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弯曲回弹逆解公式及其在焊管预弯机组设计中的应用 被引量:8
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作者 刘京雷 谢仕强 阮锋 《锻压技术》 CAS CSCD 北大核心 2005年第2期36-38,43,共4页
根据小曲率弯曲成形的特点,考虑了板料弯曲的纯弹性变形部分对回弹的影响,推导出根据板料强度、厚度和最终成形半径直接计算弯曲半径的回弹逆解公式,并应用于大口径UOE焊管预弯成形的设计上。根据计算公式给出了B~X100钢级板料UOE焊管... 根据小曲率弯曲成形的特点,考虑了板料弯曲的纯弹性变形部分对回弹的影响,推导出根据板料强度、厚度和最终成形半径直接计算弯曲半径的回弹逆解公式,并应用于大口径UOE焊管预弯成形的设计上。根据计算公式给出了B~X100钢级板料UOE焊管预弯成形的预弯辊半径优化设计诺谟图。 展开更多
关键词 机组设计 预弯 弯曲回弹 应用 逆解 UOE焊管 弯曲成形 弹性变形 板料弯曲 弯曲半径 直接计算 优化设计 计算公式 小曲率 大口径 诺谟图 弯辊
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基于有限元逆算法的板料成形模拟拉深筋的灵敏度优化 被引量:7
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作者 易国锋 柳玉起 +1 位作者 李明林 冯少宏 《中国机械工程》 EI CAS CSCD 北大核心 2007年第1期87-90,共4页
基于有限元逆算法和灵敏度优化的BFGS(Broyden-Fletcher-Goldfarb-Shanno)算法,提出一种以成形极限曲线和起皱极限曲线作为目标函数,优化拉深成形中的拉深筋位置和大小的拉深筋灵敏度优化算法。优化算法综合考虑冲压件成形过程中起皱和... 基于有限元逆算法和灵敏度优化的BFGS(Broyden-Fletcher-Goldfarb-Shanno)算法,提出一种以成形极限曲线和起皱极限曲线作为目标函数,优化拉深成形中的拉深筋位置和大小的拉深筋灵敏度优化算法。优化算法综合考虑冲压件成形过程中起皱和破裂对成形性的影响因素,比只考虑板厚变化更能准确地反映板料的成形性,而且基于逆算法的灵敏度优化算法计算速度很快,可以应用于大型复杂冲压件的工艺参数优化过程模拟。通过两个典型的零件验证了该算法的优化结果符合实际工艺。 展开更多
关键词 逆算法 拉深筋 灵敏度分析 优化设计
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一种基于能量法的冲压回弹预测补偿算法 被引量:3
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作者 周驰 刘强 阮锋 《塑性工程学报》 CAS CSCD 北大核心 2008年第2期131-135,共5页
冲压零件的回弹会严重影响零件的形状和尺寸精度。通过对模具型面进行调整,从而去除回弹造成的形状误差是目前常用的一种手段。但是这种方法的模具型面设计工作量很大。文章在能量法的基础上,提出了一种预测任意截面形状的回转体零件回... 冲压零件的回弹会严重影响零件的形状和尺寸精度。通过对模具型面进行调整,从而去除回弹造成的形状误差是目前常用的一种手段。但是这种方法的模具型面设计工作量很大。文章在能量法的基础上,提出了一种预测任意截面形状的回转体零件回弹量的算法。该算法具有较快的计算速度,适用于多次迭代的补偿计算。利用该算法对半球形零件的拉深回弹进行了预测,所得结果与实验结果吻合较好。在此基础上,提出了一种位移调整的算法,通过在回弹预测量的反方向对模具型面进行补偿,可以自动获得补偿后的模具型面。实际计算结果表明,该算法具有较快的迭代速度,对一般形状的回转体零件可以在2次迭代后获得较高的零件精度。 展开更多
关键词 回弹 能量法 补偿算法
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板料冲压成形快速分析软件FASTAMP 被引量:23
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作者 柳玉起 杜亭 章志兵 《材料科学与工艺》 EI CAS CSCD 2004年第4期353-356,共4页
基于先进的有限元逆算法研制开发了具有独立版权的板料冲压成形快速分析软件FASTAMP,与传统的增量法CAE软件有很大的区别,可以进行快速的优化设计和成形性模拟,主要面向产品设计、工艺设计与模具设计人员.该软件具有一套完整的、独立的... 基于先进的有限元逆算法研制开发了具有独立版权的板料冲压成形快速分析软件FASTAMP,与传统的增量法CAE软件有很大的区别,可以进行快速的优化设计和成形性模拟,主要面向产品设计、工艺设计与模具设计人员.该软件具有一套完整的、独立的前后处理系统,其中包括标准的CAD数据接口、曲面编辑和曲面网格生成器. 展开更多
关键词 板料冲压 成形性 模具设计 快速分析 曲面 工艺设计 CAD CAE软件 数据接口 前后处理
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