關(guān)于材料

材料屬性??

單元類型????????Element type→add ?Combination 40 (彈簧) ??????Options：UY (定義主自由度，Y方向)

彈簧剛度系數(shù)????Real Constants→add 1：K1=16 Mass=2???2：K1=6 Mass=2

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幾何建模???????

有限元模型（直接建立節(jié)點(diǎn)）???Modeling→Create→Nodes→In Active CS ??1: 0 0 0 ??3: 0 2 0

在節(jié)點(diǎn)1、3之間建立節(jié)點(diǎn)2?????Modeling→Create→Nodes→Fill between Nds ?

坐標(biāo)軸左上角?????????????????PlotCtrls(繪圖控制)→windows controls→window options

選擇12線的彈簧???Modeling→Create→Elements→Elem Attributes ?[RESL]=1

連接12線?????????Modeling→Create→Elements→Auto Numbered→Thru Nodes ?1+2(彈簧系數(shù)是16)

選擇23線的彈簧???Modeling→Create→Elements→Elem Attributes ?[RESL]=2

連接23線?????????Modeling→Create→Elements→Auto Numbered→Thru Nodes ?2+3(彈簧系數(shù)是6)

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模態(tài)分析

選擇模態(tài)??Solution→Analysis Type→New Analysis ??Modal

模態(tài)參數(shù)??Solution→Analysis Type→Analysis Options Reduced ?No.of modes to extract=2?OK??No.of modes to print=2

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施加力 ?

節(jié)點(diǎn)12點(diǎn)在Y軸上運(yùn)動(dòng)??Solution→Master DOFs→User Selected→Defined ?1 UY ?Apply ?2 UY

節(jié)點(diǎn)3固定?????????????Solution→Define loads→Apply→Structural→Displacement(移位)→On Nodes ??3 ?ALL DOF

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求解???????Solution→Solve→Current LS

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模態(tài)完成???Finish

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模態(tài)分析

Solution→Analysis Type→New Analysis ?Harmonic

Solution→Analysis Type→Analysis Options Mode Superpos’n??Amplitud+phase（模態(tài)疊加）??Maximum mode number=2

Solution→Load Step Opts→Output Ctrls→Solu Printout ??Every substep

Solution→Load Step Opts→Time/Frequenc→Freq and Substps ?[HARFRQ=0.1+1] ?[NSUBST=50] ?Stepped

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施加力

節(jié)點(diǎn)1施加Y軸力50??Solution→Define loads→Apply→Structural→Force/Moment→On Nodes ?1 ?FY ??VALUE=-50

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求解???????Solution→Solve→Current LS

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圖顯示

選擇節(jié)點(diǎn)??TimeHist Postpro→Define Variables ?Nodal DOF result ??1 ??name+DOF solution:UY

顯示圖形??TimeHist Postpro→Graph Variables ?NVAR1=2