首页 > 学术百科

ansys如何提取模态质量

如何提取模态质量

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(

）；

2、将结构总动能除以得到，其中是系统的角频率。

下面是《ANSYS Verification Manual》中VM89.DAT稍加修改后提取模态质量的例子：

/PREP7

/TITLE, VM89, NATURAL FREQUENCIES OF A TWO-MASS-SPRING SYSTEM

C*** VIBRATION THEORY AND APPLICATIONS, THOMSON, 2ND PRINTING, PAGE 163,EX 6.2-

ET,1,COMBIN14,,,2 ET,2,MASS21,,,4

R,1,200 ! SPRING CONSTANT = 200 R,2,800 ! SPRING CONSTANT = 800 R,3,.5 ! MASS = .5 R,4,1 ! MASS = 1 N,1 N,4,1 FILL

E,1,2 ! SPRING ELEMENT (TYPE,1) AND K = 200 (REAL,1) TYPE,2 REAL,3

E,2 ! MASS ELEMENT (TYPE,2) AND MASS = .5 (REAL,3) TYPE,1 REAL,2

E,2,3 ! SPRING ELEMENT (TYPE,1) AND K = 800 (REAL,2) TYPE,2 REAL,4

E,3 ! MASS ELEMENT (TYPE,2) AND MASS = 1 (REAL,4) TYPE,1 REAL,1

E,3,4 ! SPRING ELEMENT (TYPE,1) AND K = 200 (REAL,1) M,2,UX,3

OUTPR,BASIC,1 D,1,UY,,,4 D,1,UX,,,4,3 FINISH

/SOLU

ANTYPE,MODAL

MODOPT,subspa,2,,,2,ON MXPAND,2,,,YES SOLVE FINISH

/post1

set,1,1

etabl,kene,kene ssum

*get,keneval1,ssum,,item,kene *get,freqval1,mode,1,freq

eigen1=(2*3.14159*freqval1)**2 pmass1=2*keneval1/eigen1

set,1,2 sonic2000

etabl,kene,kene ssum

*get,keneval2,ssum,,item,kene *get,freqval2,mode,2,freq

eigen2=(2*3.14159*freqval2)**2 pmass2=2*keneval2/eigen2

finish

ansys使用技巧总结：[9]如何提取模态质量

李克才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(）；2、将结构总动能除以得到，其中是系统的角频率。

下面是《ANSYS Verification Manual》中VM89.DAT稍加修改后提取模态质量的例子：/PREP7/TITLE, VM89, NATURAL FREQUENCIES OF A TWO-MASS-SPRING SYSTEMC*** VIBRATION THEORY AND APPLICATIONS, THOMSON, 2ND PRINTING, PAGE 163,EX6.2-2ET,1,COMBIN14,,,2ET,2,MASS21,,,4R,1,200 ! SPRING CONSTANT = 200R,2,800 ! SPRING CONSTANT = 800R,3,.5 ! MASS = .5R,4,1 ! MASS = 1N,1N,4,1FILLE,1,2 ! SPRING ELEMENT (TYPE,1) AND K = 200 (REAL,1)TYPE,2REAL,3E,2 ! MASS ELEMENT (TYPE,2) AND MASS = .5 (REAL,3)TYPE,1REAL,2E,2,3 ! SPRING ELEMENT (TYPE,1) AND K = 800 (REAL,2)TYPE,2REAL,4E,3 ! MASS ELEMENT (TYPE,2) AND MASS = 1 (REAL,4)TYP

E,1REAL,1E,3,4 ! SPRING ELEMENT (TYPE,1) AND K = 200 (REAL,1)M,2,UX,3OUTPR,BASIC,1D,1,UY,,,4D,1,UX,,,4,3FINISH/SOLUANTYPE,MODAL MODOPT,subspa,2,,,2,ONMXPAND,2,,,YESSOLVEFINISH/post1set,1,1etabl,kene,kenessum *get,keneval1,ssum,,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

利用ansys提取模态的质量

/PREP7 /TITLE, VM89, NATURAL FREQUENCIES OF A TWO-MASS-SPRING SYSTEM
C*** VIBRATION THEORY AND APPLICATIONS, THOMSON, 2ND PRINTING,
PAGE 163,EX 6.2-2
ET,1,COMBIN14,,,2
ET,2,MASS21,,,4
R,1,200 ! SPRING CONSTANT = 200

R,2,800 ! SPRING CONSTANT = 800
R,3,.5 ! MASS = .5
R,4,1 ! MASS = 1
N,1
N,4,1
FILL
E,1,2 ! SPRING ELEMENT (TYPE,1) AND K = 200 (REAL,1)
TYPE,2
REAL,3
E,2 ! MASS ELEMENT (TYPE,2) AND MASS = .5 (REAL,3)
TYPE,1
REAL,2
E,2,3 ! SPRING ELEMENT (TYPE,1) AND K = 800 (REAL,2)
TYPE,2
REAL,4

E,3 ! MASS ELEMENT (TYPE,2) AND MASS = 1 (REAL,4)
TYPE,1数码彩扩
REAL,1
E,3,4 ! SPRING ELEMENT (TYPE,1) AND K = 200 (REAL,1)
单向器M,2,UX,3
OUTPR,BASIC,1
D,1,UY,,,4
D,1,UX,,,4,3
FINISH

/SOLU
ANTYPE,MODAL
MODOPT,subspa,2,,,2,ON MXPAND,2,,,YES
SOLVE
FINISH

/post1

set,1,1
etabl,kene,kene
ssum
球磨*get,keneval1,ssum,,item,kene
*get,freqval1,mode,1,freq
eigen1=(2*3.14159*freqval1)**2
pmass1=2*keneval1/eigen1

set,1,2
etabl,kene,kene
ssum
*get,keneval2,ssum,,item,kene

*get,freqval2,mode,2,freq
eigen2=(2*3.14159*freqval2)**2
姿态传感器pmass2=2*keneval2/eigen2

finish

本文发布于:2024-09-21 20:38:36，感谢您对本站的认可！

本文链接：https://www.17tex.com/xueshu/229355.html

上一篇：一号线行车组织规则修订重点学习内容

下一篇：工程更改要求(ECR)

标签：模态提取质量动能

留言与评论（共有 0 条评论）