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MATLAB语言及其应用

于 2020-12-07 发布
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MATLAB入门教程,适合初学者。MATLAB语言主要应用于工程计算、控制设计、信号处理与通讯、图像处理、信号检测、金融建模设计与分析等领域。课程的作用在欧美各高等学校, Matlab成为线性代数、自动控制理论、数字信号处理、时间序列分析、动态系统仿真、图像处理等诸多课程的基本教学工具,成为本科生、硕士生和博士生的必须掌握的基本技能。在设计研究单位和工业部门, Matlab已被广泛地用于研究和解决各种具体的工程问题。可以预见,Mab将在我国科学研究和工程应用中发挥越来越大的作用2015/9/14Application of Matlab Language3课程的目的(0 bjectives of This Course)讲授 MATLAB语言基础入门知识,介绍 MATLAB产品的体系、 MATLAB桌面工具的使用方法,重点介绍 MATLAB的数据可视化、数值计算的基本步骤以及如何使用 MATLAB语言编写整洁、高效、规范的程序。并涉及到一些具体的专业应用工具箱(如:信号处理工具箱、图像处理工具箱等)通过本课程的学习,了解、熟悉、掌握 MATLAB的基本编程方法,并具有初步的利用计算机处理、解决实际问题的能力,为进一步学习后续的专业课程做好准备本课程的特点( Features of This course)交叉性课程,是计算机技术、数学理论知识以及诸多工程理论知识的综合。实践性课程内容多,课时少,要求同学上课认真听讲,要充分利用上机实践消化、理解、掌握课上讲解内容。2015/9/14Application of Matlab Language4课程安排课堂教学:共24学时;(1-12周)上机试验:共24学时(2-13周,周二7-8节,九实401、402、403)口学习成绩1)上机实验成绩占30%2)考勤10%3)考试60%(随堂考试)。主要参考书《精通 MaTLAB6.5》张志涌等编著,北航出版,2003年《高等应用数学问题的 Matlab求解》薛定宇等著,清华大学出版社,2004年《 Matlab程序设计与应用》刘卫国主编,高等教育出版社2015/9/14Application of Matlab Language授课宗旨讲授 MATLAB的通用功能。寓教于例,由浅入深。关于科学计算,着重强调理论概念、算法和实际计算三者之间的关系。2015/9/14Application of Matlab Language第一讲 Matlab概述前言Matlab软件概述Matlab的桌面环境及入门知识2015/9/14Application of Matlab Language1 Matlab概述内容Matlab发展历史Matlab产品家族 Matlab family of product体系Matlab语言的特点。目的全面了解 Matlab软件包激发对Maab软件的学习兴趣2015/9/14Application of Matlab Language81.1 MATLAB的历史及影响70年代中期, Cleve moler博土及其同事在美国国家基金会的帮助下,开发了 LINPACK和EⅠ SPACK的 FORTRAN语言子程序库,这两个程序库代表了当时矩阵运算的最高水平。到了70年代后期,身为美国新墨西哥州大学计算机系系主任的 Cleve moler,在给学生上线性代数课时,为了让学生能使用这两个子程序库,同时又不用在编程上花费过多的时间,开始着手用 FORTRAN语言为学生编写使用Cleve molerLINPACK和 EISPACK的接口程序,他将这个程序取名为MATLAB,其名称是由 MATrix和 LABoratory(矩阵实验室)两个单词的前三个字母所合成。在1978年, Malab就面世了。这个程序获得了很大的成功,受到了学生的广泛欢迎。在以后的几年里, Matlab在多所大学里作为教学辅助软件使用,并作为面向大众的免费软件广为流传。2015/9/14Application of Matlab Language将 MATLAB商品化的不是 Cleve moler,而是一个名叫 Jack little的人。当免费的 MATLAB软件到 Stanford大学, Jack little正在该校主修控制,便接触到了当时 MATLAB,直觉告诉他,这是一个具有巨大发展潜力的软件。因此他在毕业沒多久,就开始用C语言重新编写了 MATLAB的核心。在 Moler的协助下,于1984年成立 MathWorks公司,首次推出 MATLAB商用版。在其商用版推出的初期, MATLAB就以其优秀的品质(高效的数据计算能力和开Jack little放的体系结构)占据了大部分数学计算软件的市场,原来应用于控制领域里的一些封闭式数学计算软件包(如英国的UMST、瑞典的LUND和SⅠMNON、德国的 KEDDC)就纷纷被淘汰或在MATLAB上重建。2015/9/14Application of Matlab Language10

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The work of preparing International Standards is normally carried outthrough iso technical committees. Each member body interested in a subject for which a technicalcommittee has been established has the right to be represented on that committee. Internationaorganizations, governmental and non-governmental, in liaison with ISO, also take part in the workIso collaborates closely with the International Electrotechnical Commission (IEC) on all matters ofelectrotechnical standardizationInternational Standards are drafted in accordance with the rules given in the ISo/IEC Directives, Part 2The main task of technical committees is to prepare lnternational standards. draft InternationalStandards adopted by the technical committees are circulated to the member bodies for votingublication as an International Standard requires approval by at least 75 of the member bodiescasting a voteAttention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. ISO shall not be held responsible for identifying any or all such patent rightsIso 16750-3 was prepared by Technical Committee ISO/TC 22, Road vehicle, Subcommittee SC 3,Electrical and electronical equipment.This third edition cancels and replaces the second edition (Iso 16750-3: 2007), which has beentechnically revisedISo 16750 consists of the following parts, under the general title road vehicles-Environmental conditionsand testing for electrical and electronic equipment:Part 1: GeneralPart 2: electrical loadsPart 3: Mechanical loadsPart 4: Climatic loadsPart 5: chemical loadso ISO 2012-All rights reservedINTERNATIONAL STANDARDIso16750-3:2012(E)Road vehicles- Environmental conditions and testing forelectrical and electronic equipmentPart 3Mechanical loads1 ScopeThis part of IS0 16750 applies to electric and electronic systems/components for road vehicles. Itdescribes the potential environmental stresses and specifies tests and requirements recommended forthe specific mounting location on/in the vehicleThis part of iso 16750 describes mechanical loads2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies For undated references, the latest edition of the referenceddocument (including any amendments applies.Iso16750-1, Road vehicles- Environmental conditions and testing forelectrical andelectronicequipment-Part 1: GeneralIEC 60068-2, 6, Environmental testing- Part 2-6: Testing, Test Fc: Vibration SinusoidalIEC60068-2, 14, Basicenvironmental testing procedures- Part 2-14: Tests-Test Nb: Change oftemperatureTEC 60068-2, 64, Environmental testing Part 2-64: Test methods -Test Fh -Vibration, broad-bandrandom(digital control)and guidanceIEC 60068-2, 80, Environmental testing- Part 2-80: Tests- Test Fi: Vibration - Mixed mode testingIEC 60068-2-31, Environmental testing procedures- Part 2: Tests; Test Ec: Free fall, Clause 5.23 Terms and definitionsFor the purposes of this document, the terms and definitions given in Iso 16750-1 app4 Tests and requirements4.1 Vibration41.1 GeneralThe vibration test metho ds specified consider various levels of vibration severities applicable to on-board electrical and electronic equipment. It is recommended that the vehicle manufacturer andsupplier choose the test method, the environmental temperature and vibration parameters dependingon the specific mounting locationFollowing the expressions in MIL-STD please noticeC ISO 2012-All rights reservedIso16750-3:2012EWhen applied properly, the environmental management and engineering processes described in this partof Iso 16750 can be of enormous value in generating confidence in the environmental worthiness andoverall durability. However, it is important to recognize that there are limitations inherent in laboratorytesting that make itimperative to use proper caution and engineering judgement when extrapolating theselaboratory results to results that may be obtained under actual service conditions. In many cases, realworld environmental stresses (singularly orin combination cannot be duplicated practically or reliably intestlaboratories. Therefore, users of this part of Iso 16750 should not assume that a system or componentthat passes laboratory tests of this part of Iso 16750 would also pass field/ fleet verification trialsThe specified values are the best estimation one can get up to the moment when results frommeasurements in the car are received - but they do not replace a car measurement!The specified values apply to direct mounting in defined mounting locations. Using a bracket formounting can resultin higher or lower loads. If the device under test ( DUT)is used in the vehicle with abracket then all vibration and mechanical shock test shall be done with this bracketCarry out the vibration with the dut suitably mounted on a vibration table. The mounting method (sused shall be noted in the test report. Carry out the frequency variation by logarithmic sweeping of 0,5octave/minute for sinusoidal tests and the sinusoidal part of sine on random tests. The scope of therecommended vibration tests is to avoid malfunctions and breakage mainly due to fatigue in the fieldTesting for wear has special requirements and is not covered in this part of ISo 16750Loads outside of the designated test frequency ranges are to be considered separatelNOTE Deviations from the load on the DUT can result, should vibration testing be carried out according tothis part of Iso 16750 on a heavy and bulky dut, as mounting rigidity and dynamic reaction on the vibrator tableexcitation are different compared to the situation in the vehicle. This deviation can be minimized by applying theaverage control method(see Annex A)Application of the weighted average control method according to IEC 60068-2, 64 is to be agreed uponSubject the dut during the vibration test to the temperature cycle according to iEC 60068-2, 14, withelectric operation according to diagram 1. Alternatively, a test at constant temperature may be agreed onOperate the dutelectrically as indicatedin Figure l at Tmin(Short functional testafterthe dUT completelyreached Tmin). This functional test shall be as short as possible- only long enough to check the properperformance of the dUt. This minimizes self-heating of the dUT. Additional electrical operation of theDUT between 210 min and 410 min of the cycle (see Figure 1)Additional drying of test chamber air is not permittedIn the vehicle, vibration stress can occur together with extremely low or high temperatures; for thisreason, this interaction between mechanical and temperature stress is simulated in the test, too. afailure mechanism is, for example, a plastic part of a system/component, which mellows due to the hightemperature and cannot withstand the acceleration under this condition2o ISO 2012-All rights reservedIso16750-3:2012[EYmax20aburditt0100200300400500600yY temperature[°C]x time [ minIa Operating mode 3.2 according to ISo 16750-1.b Operating mode 2. 1 according to ISo 16750-1One cycleFigure 1-Temperature profile for the vibration testTable 1- Temperature versus time for the vibration testTimeTemperaturemin°C0206040150-4021020300max41048020See Is016750-44.1.2 Tests4.1.2.1 Test I- Passenger car, engine4.1.2.1.1 PurposeThis test checks the dUt for malfunctions and breakage caused by vibrationThe vibrations of a piston engine can be split up into two kinds: Sinusoidal vibration which results from theunbalanced mass forces in the cylinders and random noise due to all other vibration-schemes of an engine,C ISO 2012-All rights reserved3Iso16750-3:2012Ee.g. closing of valves. In the lowest frequency range from 10 Hz to 100 Hz the influence of rough-roadconditions is taken into account. The main failure to be identified by this test is breakage due to fatigueNOTE 1 Road profile usually has negligible impact on engine-mounted components. Shock inputs are effectivelysolated by suspension, and engine-mounting systemsThe test profiles specified in the following clauses apply to loads generated by(four strokereciprocating enginesNotE 2 If the dut is to be tested for a specific resonance effect, then a resonance dwell test according to 8.3.2of IEC 60068-2, 6: 2007 can also be applied4.12.1.2Test4.1.2.1.2.1 GeneralIt is required to perform this test as a mixed mode vibration test according to IEC 60068-2, 80NOTE The test duration is based on A 4. The temperature in the chamher is above room temperature (rt)atthe end of the test (2 3/4 temperature cycles4.1.2.1.2.2 Sinusoidal vibrationPerform the test according to IEC 60068-2, 6, but using a sweep rate of s 0,5 octave/minute. Use a testduration of 22 h for each plane of the dUTUse curve l in Table 2/ Figure 2 for DUT intended for mounting on engines with 5 cylinders or fewerUse curve 2 in Table 2/Figure 2 for dUT test intended for mounting on engines with 6 cylinders or moreBoth curves may be combined to cover all engine types in one test2502001501005050100150200250300350400450500ⅩKeyamplitude of acceleration [m/s2IXfrequency [Hzcurve1(≤5 cylinders)curve 2(5 cylindersFigure 2- Vibration severity curves4o ISO 2012-All rights reservedIso16750-3:2012[ETable 2- values for max acceleration versus frequencyCurve 1(see Figure 2FrequencyAmplitude of accelerationHz100100200200240200270100440100Curve 2(see Figure 2)FrequencyAmplitude of accelerationHm/s2100100150150440150CombinationFrequencyAmplitude of accelerationH1001001501502002002402002551504401504,1.21.2.3 Random vibrationPerform the test according to IEC 60068-2, 64. 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