[求助]快要疯了
<P>在论坛上看到不断有人得到帮助，很是羡慕～我的问题一直没有得到解决，不知道能不能行行好，给我解答一下，小人先在这里叩头了！<BR>Ansys输流管耦合边界条件的加载..<BR>/BATCH,LIST <BR>/PREP7 <BR>/TITLE,vibration of pipe with fluid in </P><P>!单元 </P>
<P>et,1,42,,,3 <BR>et,2,45 <BR>et,3,29 <BR>et,4,30,,0 ! structure present <BR>et,5,30,,1 ! structure absent <BR>r,1,0.0036 </P>
<P>!材料 </P>
<P>mp,ex,1,69e9 <BR>mp,dens,1,2700 <BR>MP,DENS,2,1030 <BR>MP,SONC,2,1460 </P>
<P>!建模、分网 </P>
<P>cyl4,,,0.0228,,0.0248 <BR>lesize,all,,,8 <BR>mshkey,2 <BR>mshape,0,2d <BR>aatt,1,,1 <BR>amesh,all </P>
<P>cyl4,,,0.0228 <BR>asel,s,,,2 <BR>lsla,s <BR>lesize,all,,,8 <BR>mshkey,0 <BR>mshape,0,2d <BR>aatt,2,,3 <BR>amesh,all <BR>allsel </P>
<P>!由面单元生成体单元 </P>
<P>asel,s,,,1 <BR>extopt,attr,1,1,1 <BR>extopt,esize,200 <BR>extopt,aclear,1 <BR>type,2 <BR>vext,all,,,,,0.849 <BR>allsel <BR>asel,s,,,2 <BR>extopt,attr,1,1,1 <BR>extopt,esize,200 <BR>extopt,aclear,1 <BR>type,4 <BR>vext,all,,,,,0.849 <BR>allsel <BR>nummerg,all <BR>!单元属性修改 </P>
<P>esel,s,type,,4 <BR>nsle,s,all <BR>csys,1 <BR>nsel,s,loc,x,0.0228 <BR>esln,s,0,all <BR>esel,inve <BR>nsle,s <BR>emodif,all,type,5 <BR>allsel </P>
<P>!流固耦合单元标识 <BR>nummrg,node <BR>csys,1 <BR>nsel,s,loc,x,0.0228 <BR>esln,s,type,,4<BR>sf,all,fsi,1 <BR>allsel <BR>finish <BR>就是这段程序，在计算机上进行模态的分析，为什么运行事，计算机出现<BR>*** WARNING *** CP = 2.578 TIME= 20:50:59<BR> ANSYS..Is not a recognized BEGIN command, abbreviation, or macro. <BR>This command will be ignored. </P>
<P> *** WARNING *** CP = 2.672 TIME= 20:50:59<BR> The /BATCH command must be the first line of input. <BR>The /BATCH command is ignored. </P>
<P> *** WARNING *** CP = 7.938 TIME= 20:51:41<BR> Real constant 1 referenced by at least element types 5 and 4. </P>
<P> *** WARNING *** CP = 8.172 TIME= 20:51:42<BR> Element 1 (SOLID45) uses material 1 for which Poisson's ratio is <BR> undefined.A default value of 0.3 will be used.Input MP,PRXY, 1,0.3<BR> to eliminate this warning. </P>
<P> *** WARNING *** CP = 8.188 TIME= 20:51:42<BR> No constraints have been defined using the D command. </P>
<P> *** WARNING *** CP = 18.641 TIME= 20:51:55<BR> Coefficient ratio exceeds 1.0e8 - Check results. </P>
<P> *** WARNING *** CP = 90.781 TIME= 20:53:16<BR> There are 1 positive pivots with ratios less than 1.E-13 indicating a <BR> possible poorly conditioned stiffness matrix. </P>
<P> *** WARNING *** SUPPRESSED MESSAGE CP = 129.828 TIME= 20:54:06<BR> Lanczos recursions terminated after 5 vectors.Apply a new shift <BR> (FREQB) using MODOPT command and re-run for additional eigenvalues of <BR> the problem. <BR><BR>计算到第四步后，计算机提示<BR>Error messagesdiscontinued after 5 messages was displayed<BR>到底，究竟是怎么回事呢？</P>
回复：（wj9984）[求助]快要疯了
WARNING给的信息不是很清楚吗？比如材料1的泊松比没有定义，一条条先改掉吧AaronSpark
我也知道一条条的改掉啊！可是有的不知道哪里出了错误所以才来请教的．材料的泊松比不定义ansys不是自己默认为０吗？有的就是无关的警告，可以忽略吧．因为是看模态，还是管子的模态，所以也不用定义自由度的约束吧？那么警告是不是没有什么实际的意义呢？楼上的能不能帮忙看看呢？回复：（wj9984）[求助]快要疯了
<P>呵呵别疯，今天我起来早了无事，帮你看了下。<BR>*** WARNING *** CP = 2.578 TIME= 20:50:59<BR>ANSYS..Is not a recognized BEGIN command, abbreviation, or macro. <BR>This command will be ignored. <BR>这个的问题是你：“Ansys输流管耦合边界条件的加载..”没有加“！”<BR>*** WARNING *** CP = 2.672 TIME= 20:50:59<BR>The /BATCH command must be the first line of input. <BR>The /BATCH command is ignored.<BR>这个的主要问题是，此命令流必须是input文件下才能有用。在gui直接输入就会有这个问题。<BR>*** WARNING *** CP = 7.938 TIME= 20:51:41<BR>Real constant 1 referenced by at least element types 5 and 4. <BR>这个是4，5没有实常数吧，<BR>*** WARNING *** CP = 8.172 TIME= 20:51:42<BR>Element 1 (SOLID45) uses material 1 for which Poisson's ratio is <BR>undefined.A default value of 0.3 will be used.Input MP,PRXY, 1,0.3<BR>to eliminate this warning. <BR>没有泊松比，看看下面的程序，明显兄弟没有仔细看原程序<BR></P><P>!单元 <BR>et,1,42,,,3 <BR>et,2,45 <BR>et,3,29 <BR>et,4,30,,0 ! structure present <BR>et,5,30,,1 ! structure absent <BR>r,1,0.0036 <BR>!材料 <BR>mp,ex,1,69e9 <BR>mp,dens,1,2700 <BR>MP,DENS,2,1030 <BR>MP,SONC,2,1460 </P>
<P>*** WARNING *** CP = 8.188 TIME= 20:51:42<BR>No constraints have been defined using the D command. <BR>这个是没约束。<BR></P>
<P>*** WARNING *** CP = 18.641 TIME= 20:51:55<BR>Coefficient ratio exceeds 1.0e8 - Check results. </P>
<P><BR> </P>
<P>*** WARNING *** CP = 90.781 TIME= 20:53:16<BR>There are 1 positive pivots with ratios less than 1.E-13 indicating a <BR>possible poorly conditioned stiffness matrix. <BR>这个是计算的问题了，前面明明说是边界条件加载<BR>但我却没发现有边界加载的地方。<BR>兄弟下次提出问题前要自己先看看。。。因为这样的问题。。。。。<BR>Error messagesdiscontinued after 5 messages was displayed<BR>这个是警告太多了，估计你真的算了好多次了可以把具体设置在<BR>/NERR,5,10000,这个基本是默认值。<BR></P>
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