諧響應分析（彈簧）

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關于材料

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）?? Modeling→Create→Nodes→In Active CS? ?1: 0 0 0?? 3: 0 2 0

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

坐標軸左上角???????????????? 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12點在Y軸上運動 ?Solution→Master DOFs→User Selected→Defined? 1 UY? Apply? 2 UY

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

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