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《模态质量矩阵的提取方法》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、我知道模态质量矩阵的提取方法，请大家分享：模态分析过程中打开振型型则化开关(MODOPT命令的Nrmkey设置为ON)，ANSYS程序将自动将每阶模态的最大位移单位化，就可以提取模态质量。计算方法如下：1、利用SSUM对ETABLE动能数据求和获得结构总动能(1/2m*ω*ω)2、将结构总动能除以1/2m*ω*ω得到m，其中ω是系统的角频率。下面是《ANSYSVerificationManual》中VM89.DAT稍加修改后提取模态质量的例子：/PREP7/TITLE,VM89,NATURALFREQUENCIESOFATWO-MASS-SPRINGSYSTEMC***VIBRATIONTH
2、EORYANDAPPLICATIONS,THOMSON,2NDPRINTING,PAGE163,EX6.2-2ET,1,COMBIN14,,,2ET,2,MASS21,,,4R,1,200!SPRINGCONSTANT=200R,2,800!SPRINGCONSTANT=800R,3,.5!MASS=.5R,4,1!MASS=1N,1N,4,1FILLE,1,2!SPRINGELEMENT(TYPE,1)ANDK=200(REAL,1)TYPE,2REAL,3E,2!MASSELEMENT(TYPE,2)ANDMASS=.5(REAL,3)TYPE,1REAL,2E,2,3!SPRINGEL
3、EMENT(TYPE,1)ANDK=800(REAL,2)TYPE,2REAL,4E,3!MASSELEMENT(TYPE,2)ANDMASS=1(REAL,4)TYPE,1REAL,1E,3,4!SPRINGELEMENT(TYPE,1)ANDK=200(REAL,1)M,2,UX,3OUTPR,BASIC,1D,1,UY,,,4D,1,UX,,,4,3FINISH/SOLUANTYPE,MODALMODOPT,subspa,2,,,2,ONMXPAND,2,,,YESSOLVEFINISH/post1set,1,1etabl,kene,kenessum*get,keneval1,ssum
4、,,item,kene*get,freqval1,mode,1,freqeigen1=(2*3.14159*freqval1)**2pmass1=2*keneval1/eigen1set,1,2etabl,kene,kenessum*get,keneval2,ssum,,item,kene*get,freqval2,mode,2,freqeigen2=(2*3.14159*freqval2)**2pmass2=2*keneval2/eigen2finish多指教
