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振幅调制与检波电路 multisim 仿真 详细电路图.docx
【实例简介】1.通过实验了解振幅调制的工作原理。
2.掌握用MC1496实现AM和DSB的方法,并通过示波器测量计算AM波调幅系数。
3.掌握模拟乘法器调幅电路的输入失调电压调节方法并观察载漏和音漏现象。
4.了解调制信号为方波时的调幅波
- 2021-11-27 00:31:30下载
- 积分:1
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MATLAB中计算psnr值的实现
用来比较两个图像进行去噪后的效果,有psnr和mse,很有用的一个计算公式,希望对大家有所帮助
- 2020-12-12下载
- 积分:1
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Gabor小波+PCA+LDA特征提取方法的人脸表情识别
基于Gabor小波+PCA+LDA特征提取方法的人脸表情识别 论文机电技术2011年12月(k)(×()4eXp|-0.5(0(4)-2×3.1415926)×U第四步:初始模型确定下来以后,采用则将该待识别人脸表情判别为第讠类表情Baum- Welch算法对参数进行重估计,选代调整模人脸表情实验及分析型参数以达最优化。这样就完成了训练建模工作,获得了在粗分本文在JAFE( Japanese Female Facial Expre-类层次下代表7种人睑表情的IMM模型sion)表情数据库中进行实验。 JAFFE人脸表情库a1=(A,B,)(=1,2,…,7)10个人,共213幅图像组成,每人都包含愤怒、23HMM人脸表情分类厌恶、恐惧、髙兴、悲伤、惊讶和中性7种表情,对待识别的人脸表情图像,按本节22中模型每人每种表情2~4幅,每和表情共有27幅本文实验与 Mihcac等的测试方法相似,把数训练步骤的第一步获得观察向量O,然后计算观据库中的210图像分成3个部分,每个部分包含察向量O与已训练好的HMM模型A1=(A,B,z)10个人,且每个人包含7幅不同表情图像,每次使的似然概率P(O|λ)(=,2,…,7)。通过用其中的一个部分训练各个表情的HMM模型,剩Forward-Backward算法来计算似然概率,如果下的两个部分用来测试。循环操作3次,然后对这P(O|A1),i∈(1.2,…,)在P(OA)(=1,2,…,7)3次取平均值,得出表情识别率。本方法获取的表中最人,即情识别率见表1P(Ol, )=max p(ola)表1人脸表情识别结果愤怒厌恶恐惧高兴中性悲伤惊讶识别率/愤怒厌恶恐惧5591高兴中性悲伤0201100095.00020惊讶05693.33整体识别率92.14从表1中可以看出,本方法可以获得较好的表高的问题,提出了一种新的人脸表情识别方法。情识别率,但是,从实验中也可发现,不管是有本方法通过更加有效的 Gabor小波+PCA+LDA表没有减少分类类别数,实验中始终存在误识别。情特征提取方法,然后结合IMM模型建立7个对从实验数据斥中发现,悴中杲些人的种表情变化应基本表情+中性表情的模型,进行识别分类,并不明显,即使人眼也无法确定其表情类别,以并且取得了92.14%的整体识别率。同时,在实验致算法在识别时出现错误。中发现,由于人脸实验数据库中某些人的7种表情4结论变化并不明显,即使人眼也无法确定其表情类别,以致算法在识别时出现错误。本文针对目前人脸衣情的整体识别卒普遍不(下转第35页)21994-2015ChinaacAdemicJOurnalElcctronicPublishingHousc.Allrightsrcscrved.http://www.cnki.nct第6期林彩邴等:磁流变阻尼器减振系统的分数阶微分方程硏究35[2] DROZDOVAD Mechanicsofviscoelasticsolids[M]. New York: John Wiley &Sons Ltd, 1998: 21-65B3 LAKES RS. Viscoelastic solids[M]. London: CRC Press, 1998: 63-1104 Stanway R, Sproston, J L, Stevens N (i. Non-liner modeling of an electrorheological vibration damper.J. Electrostatics,1987,20[S]周强,瞿伟廉.磁流变阻尼器的两种力学模型和试验验证[.地震工程与工程振动,2002,22(40.[6] Gamoto DR, Filisko F E. Dynamic mechanical studies of electrorheological materials moderate frequencies. J. Rheology,991,35(3).[刀]汪建晓,孟光.磁流变阻尼器用于振动搾制的理论及实验研究J.振动与冲击,2001,20(2)[8 Wen Y K. Method of random vibration of hysteretic systems[J. Journal of Engineering Mechanics Division, ASCE102(EM2),19769SpencerJr. BF, Dyke SJ, Sain M K, Carlson, J.D. Phenomenological model of a magnetorheological damper. JEngrg. MechASCE.1997,123[10]薛定宇陈阳泉高等应用数学问题的 MATLAB解[M清华大学出版社,2010[l]l云,谭半.磁流变阻尼控制理论与技术[M科学出版社2007[1】]王振滨曹广义分数微积分的两种系统建模方汏系统仿真学报,2004,6(4:810-81上h与比比比比匙比比知5印(上接第20页)参考文献[1] ZHAO Quan-you, PAN Bao-chang, PAN Jian-jia, et al. Facial expression recognition based on fusion of Gabor and LBPfeaturesLA] In: Proceedings of the 2008 International Conference on Wavelet Analysis and Pattern Recognition[C), HongKong,IEEE,2008(8):362-367[2] Tang Fang-qi, Deng Ben-zai. Facial Expression Recognition using AAM and Local Facial Features [A]. In: Proceedings ofthe Third International Conference on Natural Computation[C], Haikou, China, IEEE, 2007(8): 632-635[3]陈培俊基于静态图像的人脸表情识别研咒[M成都:西南交通大学,2007[4] Lades M, Vorbruggen JC, Buhmann J. Distortion invariant object recognition in the dynamic linkarchitecture[J].IEEE Transactions on Computers, IEEE, 1993, 42(3): 300-311[5]彭辉张长水荣钢等基于KL变换的人脸自动识别方法清华大学学报(自然科学版),2007,37(6):6770[6]Duda RO, Hart PE, Stork DG Pattern Classification(second edition). New York: Wiley, 20017]李云霞,李治柱,吴亚栋基于HMM的关键词识别系统计算机工程,2004,30(7):130-132谨致作者敬请本刊作者允诺:稿件中没有侵犯他人著作权或其它杈利的内容并且文责自负:投寄给本刊的槁件(论文、图表、照片等)自发表之日起,其专有出版权和网络传播权即授于本刊,并许可本刊在本刊网站或本刊授权的网站上传播及屮国核心期刊(遴选)数据库、屮国学术期刊综合评价数据库、屮文科技期刊数据库、屮国台湾华艺数据库全文收录。对上述合作若有异议者,烦请来时向本刊申明,未作申明者,本刊将视为同意,谢谢合作。并致诚挚敬意。《机电技术》编辑韶21994-2015ChinaacAdemicJOurnalElcctronicPublishingHousc.Allrightsrcscrved.http://www.cnki.nct
- 2020-12-06下载
- 积分:1
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STM32控制BQ76940的BMS保护C代码
STM32控制BQ76940的BMS的保护部分源代码C程序,底层用的是TI的例程IIC通讯,初始化部分大家自己设置好就应该可以用的。
- 2020-11-28下载
- 积分:1
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VMD算法matlab函数.zip
最近毕设在做基于VMD的算法,我花了一天时间翻遍了全网,才找到可以不用会员或者充值就能下载而且能用的VMD函数源代码,CSDN上都是付费的。省了后续有人做这个的时候再费尽周折,所以知识共享,上传并免费提供下载。
- 2021-05-06下载
- 积分:1
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基于OpenCv的旋转匹配
基于OpenCv实现了模板图像的旋转匹配,此代码基于matchTemplate函数封装实现可以得知旋转角度的模板匹配
- 2020-11-28下载
- 积分:1
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光伏发电系统MPPT仿真
光伏发电系统MPPT仿真建模模型,有同型号的多种讲解。这个是扰动观察法的。
- 2020-06-27下载
- 积分:1
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基于MATLAB的离散余弦变换
在图像的变换和压缩中,常常用到离散余弦变换(DCT)。DCT具有能使图像的最重要的信息集中在DCT的几个系数上的性能。正是基于此,DCT通常应用于图像的压缩.
- 2020-11-27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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园区3D模型obj格式,附加高德3d地图demo
一个园区的obj模型,并附有部分纹理.同时还有高德地图加载3dobj模型实例
- 2020-11-27下载
- 积分:1