多摩川编码器说明书.pdf
多摩川编码器说明书 串行信号接收芯片AU5561可 以解码Ts5647、 Ts5648、Ts5667、 Ts5668、 Ts5669等 型号的编码器 ,可以提供40到iiO位串并信号的转换 ,并且可以和1s/32位 CPU或DsP总线接 口。AU5661N1,提 供中断信号与CPU同步 ,它也能在没有CPU的两种方式 (手动模式 )下读取编码器数据 :lD3(单回转数据 ,多回转数据与报警7S508TS5170O/S128serieso/S85 series产品类型增量式产品类型增量式incrementalIncremental电源电压电源电压Supply voltageDC+24V±20%Supply voltageDC+5V±5%外径128Imrn85mm分解能25~5000C/T分解能9600~50,000CResolutionResolution输出方式电压输出 otago Cutput输出方式长线驱动Output for推拉互补输出 Push pul OutputOutput formLine Drive保护构造P=57保护构造P-52Protective constructionProtective construction质量7 kg Max据置型,8 kg max/加载型质量1 kg MaxMassvass用途: Application用途: Application制造钢铁生产线 Iron steel line■交流伺服马达 AC servo motors工程机械 Machine tools造纸生产线 Paper Producing LineT55410S5647755648O/S90 SeriesSA56 Series产品类型增量式产品类型智能绝对式IncrementalSmart Abs电源电压DC+5V±5%电源比压Supply VoltageSupply Voltage外径56mmSizeSize分解能00c0C/T,100,000G丌,12000T,分解能20or16oit多回转计数量16bt器Resolution36000CcT,400,000c7,480,0007Resolution(65,536转)合计6or32bt输出方式长线驱动20 or 16bit/tum and 16bit/65, 536Output formturns(total 36 or 32bit)保护构造输出方式Protective constructionOutput formLine driver质量3kg Max保护构造开放构造Protective constructionNot Enclosed用途: Application0. 6kg Max测量设备 Measuring Equipment工程机械 Machine tools用途: Application■工程机械 Machine tools机器人 Robots机器人 Robots计测机器 Measuring Instruments高精度角度割出装置Hgh- accuracy Angular Indexing Equipment半导体生产设备 Semiconductor manufacturing Equipment7S5667N2537S5667N650SA100 SeriesSA135 Seeres产品类型智能绝对式产品类型智能绝对式Smart AbsSmart Abs电源电压电源电压DC+5V±5%DC45V±5%Supply voltageSupp y voltage外径135mm100mm分解能17b转,16bt转总计3bt分解能17b转,16多转总计33btResolution17cit/um and 1 6bit multitums Total 33 bitResolution7btturm and 16bit multiturn Total 33 bit长线驱动输出方式长线驱动输出方式Output formLinc drivcrLine Driver保护构造保护构造P-40Protective constructionProtective construction质量12 ka Max(不含引线)质量15 kg max(不含引线) Without cable)Mass(Without cable)用途: Application用途: Application大功率马达 Large wattage motors大功率马达 Large wattage motors机器人 Robots机器人 Robots工程机械 Machine Tools工程机械 Machine tools树脂成形机 njection Machines树脂成形机 njection MachinesQAnD艾而特22电梯专用编码器ELEVATOR ENCODER尺寸 mm Dimer sion mmTS5200N500PCD4Do/H48Serieshounding plate details蝙码器安装面Encocer mounting surtace用途特点252M3闪六角丝APPLICATIONFEATURESpicket se: screw在轴上痄荐尺寸(Attachedsions or shaft●有齿、无齿电引机●易安装Gear and gearless tractive motor Easy to attach除非特别说明,否则公券一律为=05 mnUnless otherwise specified tolerance is s+n5m尺寸 mm Dimension mnTS5200N400p35O/H60Series空」用途特点APPLICATIONFEATURES器有齿、无齿曳引机易安装雄明细图内六角手拧紧Gear and gearless tractive motorEasy to attach轴推荐尺寸出除非特别说明,否则公差一律为±0.5 Ium Urless otherwise spccificd tolerance is+0:m755208N1e OlH100 series式样SPECIFICATIONS135●输出方式:长线驱动、推拉互补、集电极开路、正余弦=52留投线表CTION TABLEOutput form: Line Driver, push Pull, open collector, Sincos我色功能「引线频色。●电源电压 Supply voltage:5-15V●分解能 resolution:1024、40965000、6000、8190、10000CT当U儿在轴上批荐只寸抽璃址图、的普属2警出PU安装方式:各种各样Attaching way: VariousOH分解能C丌光电式 Optical外径SizeN。 TSLLLUNLI增量型中48mmResolution中6o512中空轴 Hollow Shalt4100mm1024TS5208编码器 EncoderTs5213翰出相4096TS5216ABZs52176 A, B, Z u, M,wTs52337: A, B, ZFOF1F2, F360008192TS524610000TS5236输出方式C:开放电极 Open Co lecto拉写补 Push pull长线驱动 Line driver⑧对于特殊情况,请联系我们O For special cases, pleasc consult us.23【AnD艾而特连接方面的注意事项NOTICE IN TRANSMITTING1.怎样连接到电源1. HOW TO CONNECT TOA POWER SUPPLY应该通过单独的带屏蔽线的电源线进行连接,任何Connection should be made using a plus and ground不正确的连接方法或不合适的连接线都可能导致传power line which is shielded within a single insulatedcable. Incorrect connection or improper cables will cause输噪音。unwanted noise in transmission编码器应该单独连接到电源,并且独立于编码器一The encoder should be connected to the power supply起作的电子设备,每样设备都应该使用独立的电separate from the electric device that the encoder is缆连接到电源。operating. Each should be connected to the power supplyusing separate cables而不要通过中间电子设备连接到电源。编码器和中Do not connect the encoder thru the electric device to间电子设备的地线之间仔在的阻抗会导致编码器和the power supply. The potential difference between the电源之间产生潜在的差异,这种差异将导致异常ground levels of the encoder and the power supply willbe produced by impedance of zero level bus within theelectric device. This will cause malfunction.编码器输出Encoder Output编码器输出coder Output电源电了装置电源④电子装置PowerElectricSupply编码PowerSupplyElectric device掮码器′Bu图-1好例子图-2不可取例子Fig 1 Favorable SampleFig2. No Recommendable Sampl2.地线应该尽可能的粗2. GROUND LINE SHOULD BEAS THICK AS POSSIBLEIi是电源旳输岀电流,Io是编码器流过地线的输li for power supply current and lo for output signals of an州燃出信号,Re是接地线直流阻抗,Ⅵ为输出信号可encoder will flow thru a ground line. In case of Re for DCresistance of the ground line, VL for the level of the output表达如下signals will be as followsVL=(o+li)·Re(V)=(o+i)·Re(V)ⅥL值不会超出接收器阈值电平Vt,Re要尽可能小The value of vi should not exceed t of threshold level因为当Ⅵ接近Ⅵ时,编码器对于外部噪音米说是脆for a receiver. Re should be as small as possible sincethe encoder will be vulnerable to external noise when Vl弱的。is closer toⅥt.对丁长距离信号传送,除了电源插头上的一条地线In case of long-distance transmission, another ground外,再加·条地线也是必要的。line besides the ground line paired with the plus line maybe necessary.〖()AnD艾而特243.外壳和电路之间短接3. SHORT BETWEEN CASE GROUNDAND CIRCUIT GROUND在喚音比较重的环境中,在编码器外壳地和电路地In case of having noise more than 50V between case之间的噪音信号可能会超过50V,编码器电路可能会ground and circuit ground under noisy circumstances, anelectric circuit for an encoder may not function normally.出现功能异常,在这种情况下,我们建议将外壳和In this case, the short-circuiting of case ground and cir电路地短接。cuit ground is recommendable然而,有时侯由于传送距离过长,短接可能会产生一However, in case that other adverse effects appear些相反的效果,或者说根本不可能将其短接时,我们 because of a long transmitting distance when case andcircuit ground for an encoder are short-circuited and in建议将外壳和电路之间加接个几个微法的有较好的case shorting them is impossible for some reason, it is频率特性的电容,用米做过滤噪音的滤波器。recommendable to provide, between case and circuitground, a few micro farad condensers with better fre-uency characteristics used for a noise filter.4.电源线有噪声的情况4. IN CASE OF HAVING NOISE ONPOWER LINE电源应该通过一根完全被屏蔽好了的传输线提供给Power should be supplied to an encoder thru a transmit-编码器,这样就不会有喚音信号出现在电源线上。ting line completely shielded so that no noise occurrs onpower line将屏蔽线接地以稳定信号Stable potential should be maintained by grounding thehield有必要加长屏蔽线,这样在编码器附近的传输线就It is necessary to distribute lines so that a transmitting不会被暴露在屏蔽线外面。line should not be exposed from the shield near anencoder删5编码带输出信号有尖峰的情况5. IN CASE OF SPIKE WAVESBETWEEN OUTPUT SIGNALSFOR AN ENCODER在尖峰脉冲出现的情况下,将由双绞线传送信号消In case of spike waves as shown in fig 3, Spike waves除尖峰脉冲。shall be deleted by transmitting by twist pair shield line尖峰信号尖峰信号图-3峰形波图-3峰形波Fig 3 spike wavesFig 3 spike waves6.编码器盒的潜在安全措施6. POTENTIAL STABILIZATION FORAN ENCODER CASE编码器盒必须被保持在稳定的电位状态。An encoder case must be maintained in stable potential5[AnD艾而特传送距离TRANSMITTING DISTANCE在开放集电极的情况下!IN CASE OF OPEN COLLECTOR传输距离在大约50m以内(12VDC上拉),20mA集电极Transmission within a distance of about 50m(12V DC pull电流将是允许的!up) and 20mA as collector current shall be allowable在长距离传输的情况下,带光耦的接受电路在图4In case of a long range transmission, receiving circuit with适合消灭在传输线中的噪音!photo couplers in fig. 4 is suitable for eliminating noisein transmission编码器屏酸线编码器屏蔽线EncoderShield CableShield Cable≤RR2Dc输出输出Output图-4Fig.4图-4Fig.4在长线驱动的情况下IN CASE OF LINE DRIVER26Ls3126LS32(编码器 Encoder/※传送距离1km以下编码器 Encoder/※传送距离1m以下Transfer distance 1km MaxTransfer distance 1km max双絞线屏蔽双绞线屏蔽Twisted Pair Shield cableTwisted Pair Shield Cable图-5Fg.5图-5Fig.5在推拉互补的情况下!IN CASE OF COMPLIMENTARY双绞线屏蔽双绞线屏辙Twisted Pair Shield CableTwisted Pair Shield CableA:2Sc3733B: 2SA1电源 Power SupplyA2sC3733电源 Power SupplyB2SA1460A这XGNDXXXX GND厂输出信号线输出信号线itput signal编码器 EncoderL:负载L编码器EL:负载ncodeL: Load怎样使用编码器控制信号H0WT0 USE ENCODER G0 NTROL SIGNALS反向输入REVERSE INPUT通过端了“”或‘L”输入可以改变编4.7kgEncoder direction can be changed by码器方向,CCW和CW之间切换成为可能。输入inputting Hor L to this terminal.如果不需要改变方向,电路输入4.7K欢In case of no necessity of changing相对的电压为正5伏电压,或接地direction wire this terminal to +5v thru4.7K Q2 or ground to the terminal.门集输入GATE INPUT在该端子输入"凵"低电平可以保持编码器的Angle data for an encoder shall be held角度数据(直到输入高电平将数据锁存)by inputting L to this terminal(Data shall be latched until H is输入putted)数据输入门电路后,大约需10μs的时间rptAfter inputting data to gate, about 10us米锁存数据,因此这段时间过去后才能is required to latch data. So data can be刷新数据。renewed after passing this elapsed time.〖)AnD艾而特26用语定义DEFINITIONS在本书中主要术语的定义如下Definitions of principal terminology used in this catalog areas follows①旋转式编码器:一种将轴旋转角度转化为数字信息的检测① Rotary encoder: a detector that converts the rotary dis.placement of the shaft into digital signal.②增量型:根据轴旋转位移输出脉冲序列的类型2)Incremental type The type that outputs a pulse train inaccordance with the rotary displacement of the shaft.③光电型:通过检测旋转轴上改变的光量来接收信号的类型, Optical type. The type that rece, due to is by detecting在轴上附带了光电检测机构和光栅the shaft, coming with an optical detecting mechanismand an optical lattice fixed to the shaft.④磁性型:通过检测轴上旋转而改变的磁场来接收信号4 Magnetic type The type that receives signals by detect-ing the change in the magnetic field due to the rotation ofthe shaft, coming with an magnetic detecting mechanismand a magnetic lattice fixed to the shaft⑤2相输出:一种由A、B相输出信号组成的模式,其相位差为⑤2 phase output: A mode with two outputs called A phase/4周期。⑥6相输出:一种由A、B、Z相和U、V、W相组成的模式。(66-phase output: A mode consisting of A, B Phase andZero reference pulse commutation output of UWw signal⑦参考0位:也叫做Z相,作为转一圈的位置参考(7) Zero reference: Output(also called Z phase)which servesas reference for the position during one rotation.⑧开集输出:输出采川共发射极电路,并且集电极开路。(8)Open collector output An output circuit having the emitter of the transistor of the output circuit as common ancthe collector of open typeNPNNPNK⑨长线驱动输出:输出电路兼容EA(电子工业协会)(9) Line driver output Output circuit in compliance with EIARS-122A(Electric Industries Association)RS-422A(Some products are excepted from the standard.c outo out⑩最大旋转速度:轴的旋转对机械允许的速度最大值(10 Maximum rotation speed: The value indicating the maximum revolving speed mechanically permissible witrespect to the rotation of the shaft.假①最大响应频率:轴的旋转对电气响应的最大频率(有时受① Maximum response frequency: Frequency showing th最大转速限制)。limit of electrical response with respect to the rotationtne shaft(Sometimes limited by the maximum permissiblrotation speed)①2径向负载:轴的径向负载(12 Radial load: A vertical load onto the shaft①3推力负载:轴的轴向负载。(13)Thrust load A longitudinal load onto the shaft⑩轴类型:从旋转式编码器本身连接轴的轴结构。(14) Shaft type A structure with a shaft projecting from throtary encoder body.⑩中空轴类型:轴中空,被测量部分的轴直接被插入来迮接。① Hollow shaft type: A shaft with a hole inside, into whica shaft of the measured side is directly inserted for co⑩UW信号:元刷马达的120度相位差3信号(电气角16 UVW signal: Three signals of 120 phase difference forbrushless motor.240W①绝对编码器的备用电池:多回转绝对值编码器上用来提供 Battery backup absolute encoder: A multiturn absolu给计数ICencoder with counter IC provided within it.⑩3串行传输:传达许多数据信号系统以时差给电路的Serial transmission A system of transmitting many da输出线signals with time differences to an output line of a circuit27【AnD艾而特1.保护构造的种类和各类命名Types and Designations of protective structure表1防止固体物进入的保护结构种类Table 1 Types of Protective Structure against Entry of Solids第1记号保护等级First CodingProtection Degree3(半封闭型)固体的末端直径2.5mm或不能进入甲面。3( Semi totally-enclosed typeEnds of solids 2.5mm or over in diameter do not enter inside4(全封閉型)固体的末端直径1.0mm或不进入里面。4(Totally-enclosed typeEnds of solids 1. 0mm or over in diameter do not enter inside5(防尘型编码器所定的动作及安全性阻止粉尘进入。5(Dustproof typeDust that impairs the designed operation or safety of the rotary encoder do not enter inside6(耐尘型)粉尘不进入里面。6(Dusttight typeDust particles do not enter inside.表2对水侵入的保护结构的种类Table 2 Types of Protective Stucture against Entry of Water第2记号保护等级Second CodingProtection Degree0(开放型)不能防止水不进入。o(Open typeNot protected against entry of water.2(防滴2型)沿垂直15度以内下落水滴没有损害。2(Drip-proof 2 typeSubject to no harmful effects by waterdrops falling at angles 15 or less from vertical.3(防雨型)沿垂直60度以内下落水滴没有损害。3(Rain-proof typeSubject to no harmful effects by waterdrops falling at angles 60%or less from vertical4(防喷雾型)由任意方向喷雾都没有损害。4(Spray-proof type,Subject to no harmful effects by water spray from any direction.5(防喷射型)由任意方向喷射都没有损害。5( Jet-proof typeSubject to no harmful effects by water jets from any direction6(防水型)由任何方向直接喷流的水都没有损害。6(Water-proof type)Impervious to water in strong jets from any direction. ( Note 1)7(防浸型)规定的压力和时间浸没在水之下没有水进入7(Immersion-proof typeNo water entering when immersed under water at specified pressure for specified time注:耐水型意思是产品结构上不会让强水柱由任意方向进入,但Note(1)"Water-proof"means a structure that does not allow the entry of假不代表结构允许在水下使用water against strong water jets from any directions, but it doesnot mean a structure that allows use under water.2.保护构造的命名2. Designations of Protective Structure编码器的防护结构的命名包括防护结构文字IP,第1The designation of protective structure of a rotary记号和第2记号次序。encoder is comprised with IP meaning the protectivestructure. first characteristic numeral and second characteristic numeral in this order如果或第一代码或第二个代码不被指定,它必须由XIn case either the first code or the second code is not代表specified, it must be represented by X.例1|P40|P40Characteristic letters例2|P65第2记号(开放型)Example 1 IP 40 P 40Example 2 IP 652nd characteristic numeral例3|P4X第1记号(全闭型)例4|PX5Example 3 IP 4X1st characteristic numeralExample 4 IPX5(AnD艾而特28换算表CONVERSION TABLE二进制总数°(度)(分(秒Binary Bit Countsdegree(min)(sec)128281251687510125001.406258437550625095120.70312542.1875253125100351562521.093751265632,0480.1757812510.546875632811240960.087890642552734375316.411381920.0439453132.636718751582014163840.0219726561.31835937579101532,7680.0109863280.65917968839551665,5360.0054931640.3295898441978131,0720.0027465820.1647949229.18262,1440.0013732910.0823974614.94192880.0006866460.0411982.201.0485760.003433230.0205993651.242,097,1520.0001716610.0102996830.624,194,3040.0000858310.0051498410.31228388,6080.0000429150.0025749210.152416,777,2160.0000214580.00128746033.5544320.00010290.0006437300.0467,1088640.00000536400003218650.019134,217,7280.0000026820.0001609330010268435,456000001410.000804660.00229536,870,9120.0000006710.000040233301,073,741,8240.0000003350.0000201170.001角度换算表ANGLE CONVERSION TABLE1弧度( radian)=57295780=34377468=206,264801°=0174533弧度( radian)=17.4533mrad1=00290888弧度( radian)=290888mrad1”=.00000484814弧度( radian)=00484814mrad.角度概念角度(视角)(视角d相当于人的标准身高17T10.000秒(28度)35m秒(0.28度350m秒(0.028度3.5km10秒35km(东京←→八王子)(饭田←→伊那2秒180km(东京←·饭田)1秒350km(东京←→京都)0.6秒东京←→八户)0.5秒650km(饭田←→八户0.1秒冲绳←→北海道稚内5.00km(到达静止卫星的距离角度x距离29【△DD艾而特
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MIKE21教程
不错的MIKE21中文教程，主要介绍MIKE21水动力模块方面的内容Www.Zlvo.Com42.7风场( Wind forcing)···;;;·36注意:42.8冰盖( ce coverage)4.2.9引潮势( Tidal potential)42.10降水-蒸发( Precipitation- Evaporation)….4142.1波浪辐射应力( Wave radiation)424212源( Sources4342.13水工结构物( Structures)454.2.14初始条件( nitial conditions)42.15边界条件( Boundary conditions)6142.16温度/盐度模块(Tcmpcraturc/Salinity Module)6742.17湍流模块( Turbulence module)42.8解耜( Decoupling)….…6742.9输出( Outputs)…特别说明:本手册部分内容来源于网络。Www.Zlvo.Com第一章模型介绍11简介MIKE21是一个专业的工程软件包,用于模拟河流、湖泊、河口、海湾、海岸及海洋的水流、波浪、泥沙及环境。MIKE21为工程应用、海岸管理及规划提供了完备、有效的设计环境。高级图形川户界面与高效的计算引擎的结合使得MIKE2I在世界范围内成为了一个水流模拟专业技术人员不可缺少的工具。丹麦水力研究所开发的平面二维数学模型MIKE21,曾经在丹麦、埃及、澳洲、泰国及中国香港、台湾等国家和地区得到成功应用,在丬面二维白由表面流数值模拟方面具有强大的功能。目前该软件在中国的应用发展很快,并在一些大型工程中广泛应用,如:长江口综合治理工程、杭州湾数值模拟、南水北调工程、重庆市城市排污评价、太湖富营养模型、香港新机场工程建设等。12MIKE21软件特点(1)用户界面友好,属于集成的 Windows图形界面;(2)具有强大的前、后攵理功能。在前处理方面,能根据地形瓷料进行计算网格的划分;在后处理方面具有强大的分析功能,如流场动态演示及动画制作、计算断面流量、实测与计算过程的验证、不同方案的比较等;(3)多种计算网格、模块及许可选择确俫用户根据自身需求来选择模型(4)可以进行热启动,当用户因各种原因需暂时中断MIKE21模型时,只要在上次计算时设置了热启动文件,再次开始计算时将热启动文件调入便可继续计算,极大地方便了计算时间有限制的用户;(5)能进行干、湿节点和干、湿单元的设置,能较方便地进行滩地水流的模拟:(6)具有功能强大的卡片设置功能,可以进行多种控制性结构的设置,如桥墩、堰、闸、涵洞等(7)可广泛地应用于二维水力学现象的研究,潮汐、水流,风暴潮,传热、盐流,水质,波浪紊动,湖震,防浪堤布置,船运,泥沙侵蚀、输移和沉积等,Www.Zlvo.Com被推荐为河流、湖泊、河∏和海岸水流的二维仿真模拟工具。1.3水动力模块原理131控制方程模型是基于三向不可压缩和 Reynolds值均布的 Navier-SLokes方程,并服从于 Boussinesq假定和静水压力的假定。二维非恒定浅水方程组为Ch Chu chvhSChu ahauvan h6x+=1-a=欧h-a(1-22pa ax po po ph)+-(h12)+hu,Schv chuy chvfuh-ghan h apay po aygh ap2 Po ay Po po po、ax11)+hS式中:t为时间:x,y为笛卡尔坐标系坐标;n为水位;d为静止水深;h=n+d为总水深;tn,v分别为x,y方向上的速度分量;f是哥氏力系数,f=2 osin p,(为地球白转角速度,为当地纬度;g为重力加速度;p为水的密度;Sx、SS分别为辐射应力分量;S为源项;(uy,ν)为源项水流流速。字母上带横杠的是平均值。例如,矿、ν为沿水深平均的流速,由以下公式定义hu= udz, hvdzWww.Zlvo.Com为水平粘滞应力项,包括粘性力、紊流应力和水平对流,这些量是根据沿水深平均的速度梯度用涡流粘性方程得出的:T=2A2A13,2数值解法)空间离散计算区域的空间离散是用有限体积法( Finite volume method),将该连续统体细分为不重叠的单元,单元可以是任意形状的多边形,但在这里只考虑三角形和四边形单元。在MKE软件2007版本只能是三角形网格。浅水方程组的通用形式一般可以写成上(U)=S(U)(1-6)式中:U为守恒型物理向量:F为通量向量;S为源项在笛卡尔坐标系中,二维浅水方程组可以写为OU O(F-F)O(FY-Fy)S(1-7)式中:上标/和分别为无粘性的和粘性的通量。各项分别如下:0hCu+g(FhuyOu Cha0Fk=lhAolhugh42Www.Zlvo.Comadh2thPu cy Pogn+fuhpe gn opythiPo oy Po对方程(46)第i个单元积分,并运用 Gauss原理重写可得出「a(Fa)-JA(1-9)式中:A1为单元g2的面积;I;为单元的边界;ds为沿着边界的积分变量这里使用单太求积法来计算面积的积分,该求积点位于单元的质点,同时使用中点求积法水计算边界积分,方程(49)可以写为∑FnAT=S(1-10)式中:U和S分别为第个单元的U和S的平均值,并位于单元中心;NS是单元的边界数;^厂,为第j个单元的长度阶解法和二阶解法都可以用于空间离散求解。对于二维的情况,近似的Riemann解法可以用来计算单元界面的对流流动。使用Roc方法时,界面左边的和右边的相关变量需要估计取值。二阶方法中,空间准確度可以通过使用线性梯度重构的技术来获得。而平均梯度可以用由 jawahar和 Kamath于2000年提出的方法来估计,为了避免数值振荡,模型使用了二阶TVD格式。(2)时间积分考虑方程的一般形式aU=G(U)1-11)对于二维模拟,浅水方程的求解有两种方法:一种是低阶方法,另一种是高阶方法。低价方法即低阶显式的Euer方法Un1=Un+△G(Un)(1-12)式中:为时间步长。高阶的方法为以如下形式的使用了二阶的 Runge kuttaWww.Zlvo.Com方法n12=Un+△G(U,)Un+1=Un+△G(Un+12)(1-13)(3)边界条件1)闭合边界沿着闭合边界(陆地边界),所有垂直于边界流动的变量必须为0。对于动量方程,可以得知沿着陆地边界是完全平稳的。2)开边界开边界条件可以指定为流量过程或者是水位过程3)千湿边界处理动边界问题(T湿边界)的方法是基于赵棣华(1994)和 Sleigh(1998)的处理方式。当深度较小时,该问题可以被重新表述,通过将动量通量设置为零以及只考恳质量通量来实现。只有当深度足够小时,计算不考虑该网格屮元。每个单元的水深会被监测,并且单元会被定义为干、半干湿和湿。单元面也会被监测,以确定淹没边界。满足下面两个条件单元边界被定义为淹没边界:首先单元的一边水深必须小于hn,且另一边水深必须大于h;第二,水深小于hn的单元的静水深加上另一单元表面高程水位必须大于零。满足下亩两个条件单元会被定义为干单元:首先单元中的水深必须小于干水深hn;另外,该单元的三个边界中没有一个是淹没边界。被定义为干的单元在计算中会被忽略不计。单儿破定义为半干:如果单元水深介于h和hm之间,或是当水深小于hy但有一个边界是淹没边界。此时动量通量被设定为0,只有质量通量会被计算。单元会被定义为湿:如果单元水深大于ha。此时动量通量和质量通量都会在计算中被考虑。如果模型中的区域是处在τ湿边交替区,为了避免模型计算岀现不稳定性,使用者可以启用 Flood and Dry选项。在这个情形下使用者必须设定一个干水深Www.Zlvo.Com( drying depth),淹没深度( flooding water depth)和湿水深( wetting depth)者必须满足hn
- 2020-12-09下载
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