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蜂群SVM（ABC-SVM）遗传算法SVM（GA-SVM）粒子群SVM（PSO-SVM）公共数据集，UCMerced图像数据集 词袋模型
使用matlab实现蜂群SVM，粒子群SVM，遗传算法SVM，数据包含有公共数据集，公共图像数据集，图像特征提取用了词袋，保证可用（公共图像数据集太大，删除了）
- 2020-12-02下载
- 积分：1
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来自麻省理工的正则化最小二乘法讲义
来自麻省理工的正则化最小二乘法讲义，讲得精炼而且较为易懂！
- 2020-12-06下载
- 积分：1
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主成分分析PCA降维的MATLAB程序实现代码.m
【实例简介】在MATLAB中实现用主成分分析（PCA）的方法对矩阵的降维.其中包括具体程序实现代码，为了增加程序的可读性，对程序的主要步骤都进行了解释。
- 2021-11-24 00:33:59下载
- 积分：1
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MSC.Marc 2013.1理论手册
MSC.MARC是功能齐全的高级非线性有限元软件，具有极强的结构分析能力。可以处理各种线性和非线性结构分析包括：线性/非线性静力分析、模态分析、简谐响应分析、频谱分析、随机振动分析、动力响应分析、自动的静/动力接触、屈曲/失稳、失效和破坏分析等ContentsMarc Volume A: Theory and User InformationrefaceAbout this manual■■■■20Purpose of volume A20Contents of volume a20How to Use this manual211 The Marc SystemMarc Programs............■■23Marc for Analysis23Mentat or patran for gul24Structure of marc24Procedure Library24Material Library24Element Library25Program Function Library25Features and benefits of marc252 Program InitiationMarc Host Systems27Workspace Requirements27Marc Workspace Requirements27File Units30Program Initiation.........32Examples of running marc Jobs■■■■■344 Marc Volume A: Theory and User Information3 Data EntryInput Conventions38Input of List of Items39Examples of lists41Table Driven Input■■41Table Input42Parameters46Model Definition Options46History Definition Options46REZONE Option474 Introduction to mesh definitionDirect Input49Element Connectivity Data49Nodal coordinate data53Activate/Deactivate54User Subroutine Input54MESH2D54Block definition54Merging of Nodes54Block Types55Symmetry, Weighting, and Constraints57Additional Options58Mentat58FXORD Option59Major classes of the fXoRD Option59Recommendations on Use of the FXORD Option63Incremental mesh generators■■■■■63Bandwidth Optimization64Rezoning.....64Substructure65Technical Background66Scaling Element Stiffness67Contents 5BEAM SECT Parameter■■■68Orientation of the Section in Space68Definition of the section68Error Analysis74ocal AdaptivityNumber of Elements Created7474Boundary Conditions75Location of new nodes76Adaptive Criteria77Automatic Global remeshing80Remeshing criteria84Remeshing TechniquesPatran Tetrahedral mesher885 Structural Procedure LibraryLinear Analysis99Accuracy100Error estimates100Adaptive meshing101Fourier Analysis101Nonlinear Analysis104Geometric nonlinearities108Eulerian FormulationArbitrary Eulerian-Lagrangian(AEL) Formulation118Nonlinear Boundary Conditions118Buckling Analysis120Perturbation Analysis121Computational Procedures for Elastic-Plastic Analysis126Creep138Viscoelasticity142Viscoplasticity143Fracture Mechanics144Linear fracture mechanics144Nonlinear fracture mechanics147Numerical Evaluation of the J-integral148Numerical Evaluation of the Energy Release Rate with the VCCT Method150Automatic Crack PropagationDynamic Fracture Methodology1626 Marc Volume A: Theory and User InformationDynamic crack Propagation..162Crack Initiation163Mesh Splitting165Mesh Splitting Along Edges or Faces165Mesh Cutting167Dynamics...168Modal(Eigenvalue) Analysis.168Harmonic Response172Spectrum Response75Transient Analysis179Inertia relief191Rigid Body Mode Evaluation.191Rigid-Plastic Flow195Steady State Analysis95Transient Analysis196Technical background..196Superplasticity197Soil Analysis199Technical formulation200Mechanical Wear.,,,,,,,,203Design Sensitivity Analysis........■■205Theoretical considerations207Design Optimization208Approximation of Response Functions Over the Design Space..209Improvement of the Approximation211The Optimization algorithmMarc User Interface for Sensitivity Analysis and Optimization212Define Initial State with Results from a Previous Analysis215Pre state215Model sections217Steady State Rolling Analysis219Kinematics219lnetⅰaE仟fect...221Rolling Contact221Steady state rolling with marc221ContentsStructural Zooming Analysis.222Element Types Supported223Uncoupled Thermal Stress Analysis223Cure-Thermal-Mechanically Coupled Analysis224Cure Kinetics225Cure Shrinkage Strain228References,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,2296 Nonstructural Procedure LibraryHeat Transfer234Thermal Contact235Convergence Controls235Steady state Analysis236Transient Analysisemperature Effects238Initial Conditions239Boundary Conditions239Surface Energy243Thermochemical Ablation and Surface Energy Balance244Mathematical Presentation244Mechanical Erosion251Mechanical Erosion by Other Actions251pyrolySis251Coking255Monitoring Thermal Degradation258Presentation of the Energy Equation260Ablation262Welding27Radiation278Conrad Gap292Channel293Output294Diffusion295Technical Background296Hydrodynamic Bearing300Technical Background3028 Marc Volume A: Theory and User InformationElectrostatic Analysis304Technical Background305Magnetostatic Analysis308Technical background..309Magnetodynamic Analysis∴∴320Technical Background322Piezoelectric Analysis325Technical Background326Strain Based Piezoelectric Coupling..328Acoustic Analysis328Rigid Cavity Acoustic Analysis328Technical Background329Fluid mechanics330Finite element formulation333Penalty Method335Steady State Analysis336Transient Analysis336Solid Analysis336Solution of Coupled Problems in Fluids..336Degrees of Freedom337Element Types.337Coupled Analyses∴..■量■画■■■,,,,,,,,339Thermal Mechanically Coupled Analysis341Coupled Acoustic-Structural AnalysisFluid/Solid Interaction- Added Mass Approach342346Coupled Electrostatic-Structural Analysis348Coupled Magnetostatic-Structural Analysis350Coupled Thermal-Electrical Analysis (Joule Heating)352Coupled Electrical-Thermal-Mechanical Analysis355Coupled Magnetostatic-Thermal Analysis357Coupled Magnetodynamic-Thermal Analysis358Coupled Magnetodynamic-Thermal-Structural Analysis..359References∴,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,362Contents 97 Material LibraryLinear Elastic Material365Composite Material ......367Layered Materials368Classical Lamination Theory for Multi-Layered Shells371Material Preferred direction372Material Dependent Failure Criteria376Interlaminar Shear for Thick Shell, Beam, Solid shell, and 3-d Composite brick elements394Interlaminar Stresses for continuum composite elements397Progressive Composite Failure397Mixture model399Gasket403Constitutive model403Nonlinear Hypoelastic Material407Thermo-Mechanical Shape Memory Model422Transformation Induced deformation424Constitutive Theory425Phase Transformation strains425Experimental Data Fitting for Thermo-mechanical Shape Memory Alloy427Mechanical Shape Memory Model431Conversion from Thermo-Mechanical to Mechanical SMA oyExperimental Data Fitting for Mechanical Shape Memory alle434435Elastomer436Updated Lagrange formulation for nonlinear elasticity455Time-independent Inelastic Behavior456Yield Conditions458Mohr-Coulomb Material(Hydrostatic Stress Dependence)464Buyukozturk Criterion(Hydrostatic Stress Dependence)465Powder material465Obtaining Crush Curve and Shear Failure Parameters by Curve Fitting in Marc475Work or strain hardening.....,,,479Flow rule485Constitutive Relations486Time-independent Cyclic Plasticity489Time-dependent Inelastic Behavior492Creep(Maxwell Model)翻495Oak Ridge National Laboratory Laws50010 Marc Volume A: Theory and User InformationSwelling.501Viscoplasticity502Time-dependent Cyclic Plasticity502Anand solder model504Viscoelastic Material505Bergstrom-Boyce Model516Narayanaswamy Model518Frequency-dependent Material Behavior522Viscoelastic Material Behavior in the Frequency Domain522Thermo-Rheologically Simple Material Behavior in the Frequency Domain538Deformation Dependent Relaxation in the Frequency Domain539Harmonic Equations of motion541Performing viscoelastic Analysis in the Frequency Domain543Temperature Effects and Coefficient of Thermal Expansion,546Piecewise Linear Representation547Temperature-Dependent Creep548Coefficient of Thermal Expansion549Time-Temperature-Transformation549Low Tension Material552Uniaxial Cracking Data552LoW Tension Cracking552Tension Softening552Crack Closure553Crushing553Analysis554Soil model554Elastic Models554Cam-Clay Model555Evaluation of soil parameters for the critical state soil model557Damage Models565Ductile metals565Elastomers568Cohesive Zone Modeling570Nonstructural materials578Heat transfer analysis579Piezoelectric Analysis579Thermo-Electrical Analysis579Coupled Electrical-Thermal-Mechanical Analysis579Hydrodynamic Bearing AnalysisFluid/ Solid Interaction Analysis- Added Mass approach579.579
- 2020-12-04下载
- 积分：1
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霍夫变换检测正弦曲线
利用Matlab实现霍夫变换对于正弦曲线的自动识别
- 2020-12-08下载
- 积分：1
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完整版matlabGUI设计学习手记第二版（罗华飞著）附源代码以及勘误表.rar
完整版MATLAB GUI设计学习手记第二版作者：罗华飞
- 2021-05-06下载
- 积分：1
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用S7-200精确控制步进电机的程序（含注解）
用S7-200精确控制步进电机的程序（含注解） 机电工程类、工业自动化类pdf文件 解压密码:www.gzkunmao.com
- 2020-12-05下载
- 积分：1
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利用Hilbert变换提取信号瞬时特征的算法实现
研究了在工程中如何通过算法来实现利用 Hilbert 变换提取信号的瞬时特征。深入地分析了如何利用数值微分法提高提取瞬时频率特征的精度。最后,给出了一种可行的算法,并通过实验验证了这种方法可以在工程中有效地提取信号的瞬时频率特征。84微机发展第13卷①H(x)=y;H(x)=y;(i=0,1,…n)(j=0,1(11)②在每个小区间/x1,x1+17i=0,1,…,n-1)上由相关定理知:当划分的小区间的长度趋于零时H(x)是三次多项式。s(x)及其一至三阶导数分别一致收敛到f(x)及其一至可以写出分段三次 Hermite插值函数的分段表达式:三阶导数。所以用三次样条插值函数去近似表达用离散值(x)=(1+2x-x过+)2v;+表示的原函数,具有较高的可靠性。3)两种插值的比较挨尔米特 Hermite插值较三次样I-i,1+2条插值具有较好的稳定性与收敛性,但它只能休让各段曲线在连接点上的连续性,而不能保证整条曲线在这些点上y+1Ditl的光滑性。而有时不仅要求曲线连续,而且要求曲线的曲X/(i=0,18)率也连续即要求分段插值函数具有连续的一阶导数,埃H(x)的导数为尔米特 Hermite插值此时就不能满足上述要求6次样条插值较埃尔米特 Hermite插值具有较好的H(x光滑程度,用三次样条插值函数求数值导数比用埃尔米特+2(x-x2(xHermite插值可靠性大,但计算比较复杂,二者的区别见图h2yV+17, h(i-0,12)三次样条插值。已知函数y=f(x)在区间/a,b上的n+1个节点上的值y=f(x;)(i=0,1,…m),求插值函数s(x),使(i=0,1图4 Hermite插值与三次样条插值的比较图2在每个小区间x,x+1(=0.1.…n-1)上利用埃尔米特 Hermite插值得到的2FSK信号的瞬时s(x是三次多项式,记为s(x频率见图5,利用二次样条插值得到的该信号的瞬时频率③3(x)在la,b/上二阶连续可徵。见图6。数s(x)称为f(x)的三次样条插值函数可以利用节点处的二阶导数值为参数,也可以利用节点处的导数值为参数求三次样条插值涵数的表达式。若利用节点处的一阶导数值为参数,求得的三次样条插值函数的表达式为(x)=M-1x-x-)36 h6 hMihi5 DEMeN5a亩pai66hx∈[x;,x+17,b-x+1-x,S"(x)=M图5由 Hermite插值提取图6由三次样条插值提取(j=0,1的2FSK信号的瞬时频率的2FSK信号的瞬时频率对s(x)进行求导,利用S(x)在节点处一阶导数连从图5、图6可以看出利用三次样条插值得到的瞬时续的性质结合边界条件求解出参数M,把求得的参数代频率可以准确反映出信号具有的的摒时频率特征而利用入公式(10),即得三次样条插值函数的s(x)分段表示式。埃尔米特 Hermite插值得到的瞬时频率与信号具有的瞬s;(x)的导数为时频率特征不符。这是因为利用数值微分法求瞬时频率插值以后喫进行求导。三次样条插值函数具有连续的二阶M2 hiM; 2 hj导数,因而具有较好的光滑程度,符合求导条件,所以可以J+1-h(M2+1-M/)准确求出信号的瞬时频率;而埃尔米特 Hernite插值.不够光滑,虽能保证插值多项式收敛于原函数,但不能保证插x Elx,x;+1 h,=xi+I-x, S(xj )=M;值多顷式的导数收敛于原函数的导数,所以求得的值与信o1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net第6期刘慧婷等:利用 Hilbert变提取信号瞵时特征的算法实现号实际的瞬时频率值不符。实验结果和理论分析结果是(1) Hilbert变换只能近似应用于窄带信号,即形如纹的(t)=a(1)cosu+6(1)),其中>>B(B为信号带2.3.3结论宽)的信号。但实际应用中,存在许多非窄带信号, Hilbcrt利用数值微分法求瞬时频率ω(t)的步骤可以归纳变换对这些信号无能为力为:首先通过三次样条插值得到分段多项式p(1),(2)对于任意给定时刻,通过 Hilbert变换运算后的结pp(抄);然后分别对分段多项式p(t),Pp()关于变量t果只能存在一个频率值,即只能处理任何时刻为单一频率进行求导,得到pd(,ppd(t);最后求出每一时刻t所对的信号。这显然不合理,因为在实东中同一信号会含有多应的导数值,即求得t(t,u(t)。再把求得的值代入公种频率成分式(6)就完成了提取瞬时频率ω(1)的过程。求解结果见(3)对信号进行 Hilbert变换时,信号的两端会出现严图7重的端点效应。提取某些信号瞬时特征所得的瞬时频率在局部出现了负数,端点效应是造成负频率的一个原因而端点效应可以通过利用特征波对原有数据序列进行延拓的方法来解决,具体解决办法将在今后讨论。尽管目前出现了EMD担论4,其目的是将不满足Hibt变换的信号进行分解得到若干个IMF( intrinsic mode function),然后进行 Hilbert运算,达到提取信号瞬时特征的目的。该理论开辟了信号处理的新空间。但它还不够成熟还需喫进一步的完善和研究图7利用数值微分法提取信号的瞬时频率特征参考文献从图7可以看出,以三次烊条指值进行的数值微分可[]黄长蓉. Hilbert变换及其应用[J].成都气象学院学报以准确岀提取岀信号的瞬时频率特征。199,14(3):273-276.[2]杨小牛,楼A义,徐建良.软件无线电原理与应用[M].北3结束语京:电子工业出版社,2001在工程中, Hilbert变换使得我们对短信号和复杂信号[3]丁丽妤.数值计算方法[M].北京:北京理工大学出版社,的摒时特征的提取成为可能特别是对瞬时频率特征提1997取,在工程中具有十公重要的意义。文中讨论的利用三次[4] Huang N e. The empirical mode decomposition and the hilbert样条插值进行数值徵分以提取瞬时特征的方法是可行的,spectrum for nonlinear and nor stationary time series anal ysis但还存在着如下问题。[].Proc.R.soc.Lond.A,1998,454:903-995(上接第81页)218994。例22(x)=(1-2siny=223101075一般的(A算法计算了120代,求到的最大值为454176.219。154370083改进的α算法计算了34代,求到的最大值为1048575.875。改进后的αA算法收敛速度(指迭代次数)比一般GA算法几乎快了一个数量级,精度也提高了不少,特别是例2的最大值提高一倍多,速度提高这么快是未曾料到的y=74958参考文献+4X Axl Thla[1]陈国良.遗传算法及其应用[M]·北京:人民邮电出版社,图2函数2的图像1996一般GA算法计算了20代,求到的最大值为[2]袁亚湘,孙文瑜.最优化理沦与方法[M]北京:科学出版社,19991.218983[3]张铃,张钹·遗传算法杋理的硏究[J]·软件学报,改进(A算法计算了5代,求到的最大值为2000,11(7):945952o1994-2010ChinaacAdemicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net
- 2020-12-05下载
- 积分：1
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用四阶统计量方法对图像特征进行提取的MATLAB仿真程序
用四阶统计量方法对图像特征进行提取，进行分析，所用的是MATLAB仿真，仿真的程序和结果都有！
- 2020-12-09下载
- 积分：1
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线性分组码的MATLAB实现
线性分组码的产生、BPSK调制解调、过高斯白噪声信道、标准阵译码，误码率曲线
- 2020-12-12下载
- 积分：1
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