ASE 365 - Lecture 32 - Axial vibration problems ) ( ) ( ) ,...

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Unformatted text preview: Axial vibration problems ) ( ) ( ) , ( ) ( t F x U t x u u EA u A = = - : vars. of n sep' try : PDE 2 ) ( ) ( - = = = AU U EA F F F U EA F AU 2 2 2 = + = + = - U U U E U U A U EA x : ODE . , , for BCs need : Solution 2 1 2 1 sin cos ) ( C C x C x C x U- + = constant) (need : ODE Get A AU U EA x 2 ) ( = - : ODE the satisfies solution general This U A U EA x C x C x U 2 2 1 sin cos ) ( = - + = ( 29 ) sin cos ( ) ( ) ( ) sin cos ( 2 1 2 2 2 1 2 x C x C A E U A x C x C EA U EA + = = +-- = - . and about something us tell and s, ' the determine conditions boundary The 2 1 C C : case fixed- Fixed U(x ) ) essential" " or kinematic, are BCs (both : BCs ) ( , ) ( = = L U U case. string fixed- fixed the to analogous is case This x C x U C U x C x C x U sin ) ( ) ( sin cos ) ( 1 2 1 = = = + = 2 2 2 2 ) ( sin ) ( L E L E r L L L U r r r r r = = = = = = , 2 , 1 , sin ) sin( ) ( , 2 = = = = r L x r C L x L C x U L E r r r r r r : case free- Fixed O bj2 6 1 x C x U C U x C x C x U sin ) ( ) ( sin cos ) ( 1 2 1 = = = + = O bj2 6 3 , 2 , 1 , 2 ) 1 2 ( sin ) sin( ) ( =- = = r L x r C L x L C x U r r r r U(x ) : case free- Free BCs) natural" " or kinetic (two : BCs ) ( , ) ( = = L U EA U EA x C x U C U x C x C x U cos ) ( ) ( sin cos ) ( 2 2 1 = = = + = , 2 , 1 , , sin ) ( 2 = = = =- = r L E r r L L EAC L U EA r r : , 2 , 1 , , cos ) cos( ) ( = = = r L x r C L x L C x U r r r r U(x) : case mass- Fixed BC) (essential : BCs ) ( = U x C x U C U x C x C x U sin ) ( ) ( sin cos ) ( 1 2 1 = = = + = U(x ) m L C AL E L EAC sin ) ( cos 2 = L L L EAC = cot sin ) ( : by divide s, ' , Cancel equation. stic characteri this of roots Find BC) (natural : ) ( ) ( 2 L mU L U EA u m u EA L x L x = - = = = ) is (so : Let AL m AL m ) ( = L...
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ASE 365 - Lecture 32 - Axial vibration problems ) ( ) ( ) ,...

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