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derive the expressions for A and ϕ

One of the solution forms for free underdamped 1 d.o.F. vibration systems is given as : x(t) = Aeϵmetsin(ω4t+ϕ) where displacement amplitude A and phase angle ϕ are unknown constants Given initial disturbances in the form of displacement x0 and v0 , derive the expressions for the A and ϕ

Mumbai University > Mechanical Engineering > Sem 6 > Finite Element Analysis

Marks: 5M

Year: may 2016

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x=2.5,y=2.5

ˉx=2.52=0.5,ˉy=2.52=0.5

ϕ1=(1ˉxl)(1ˉyh)=(10.52)(10.51)

=0.375L=2,h=1

ϕ2=ˉxl(1ˉyh)=0.52(10.52)=0.125

ϕ3=ˉxˉyLh=0.5×0.52×1=0.125

ϕ4ˉyh(1ˉxL)=0.52(10.52)=0.375

ϕ1+ϕ2+ϕ3+ϕ4=0.375+0.125+0.125+0.375=1

T(0.5,0.5)=T1ϕ1+T2ϕ2+T3ϕ3+T4ϕ4

=100×0.375+60×0.125+50×50×0.125+90×0.375

=850c

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