Analisa Teknik Vicha Prabowo Lamoki G 621 06 034

TUGAS 1 Analisa teknik

VICHA PRABOWO LAMOKI G 621 06 034

PROGRAM STUDI TEKNIK PERTANIAN JURUSAN TEKNOLOGI PERTANIAN FAKULTAS PERTANIAN UNIVERSITAS HASANUDDIN MAKASSAR 2009

Solve the falling parachutist problem for the following case: •

v(t=0)=0

•

M=80 kg

•

C=15 kg/s

•

tf=50 s

•

Use Dt=5 s & Dt=1 s

•

Compute: v(t), true error & percent relative error for each discrete time value. Which step size gives the most accurate results? Why?

•

Problems: 1.2,6,10,15

Jawabannya : 1) t=[1.2 6 10 15]; at=5; g=9.8; m=80; c=15; v=5; a=g.*m b=c.*v gc=a./b d=a./(gc.*c) f=1.-(2.72.^-(c.*gc./m).*t) vt=d.*f a= 784 b= 75 gc = 10.4533 d=

5 f= 0.8312

0.1559 -0.4068 -1.1103

vt = 4.1559

0.7795 -2.0342 -5.5513

2) t=[1.2 6 10 15]; at=1; g=9.8; m=80; c=15; v=1; a=g.*m b=c.*v gc=a./b d=a./(gc.*c) f=1.-(2.72.^-(c.*gc./m).*t) vt=d.*f a= 784 b= 15 gc = 52.2667 d= 1 f= 0.9999 vt =

0.9997

0.9994

0.9992

0.9999

0.9997

0.9994

0.9992

Relative Error (SE = V(t=5) = 4,1559) adalah

Relative Error (SE = V(t=1) = 0,9999) adalah

True Error SE -

=

SE -

=

= 0,8441 = 0,0001