Difference between revisions of "Eduardo Christ Soloman"

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4. Panjang truss vertikal 0.6 m per tingkat
 
4. Panjang truss vertikal 0.6 m per tingkat
 +
----
 +
''''Coding''''
 +
----
 +
 +
''''Perhitungan Utama''''
 +
model Trusses_3D_Tugas_Besar_Safety
 +
 +
//define initial variable
 +
parameter Integer Points=size(P,1); //Number of Points
 +
parameter Integer Trusses=size(C,1); //Number of Trusses
 +
parameter Real Yield=215e6; //Yield Strength (Pa)
 +
parameter Real Area=0.000504;  //Area L Profile (Dimension=0.04 x 0.05)(Thickness 0.3) (m2)
 +
parameter Real Elas=195e9;    //Elasticity SS 304  (Pa)
 +
 +
//define connection
 +
parameter Integer C[:,2]=[1,5;
 +
                          2,6;
 +
                          3,7;
 +
                          4,8;
 +
                          5,6;  //1st floor
 +
                          6,7;  //1st floor
 +
                          7,8;  //1st floor
 +
                          5,8;  //1st floor
 +
                          5,9;
 +
                        6,10;
 +
                        7,11;
 +
                        8,12;
 +
                        9,10; //2nd floor
 +
                        10,11;//2nd floor
 +
                        11,12;//2nd floor
 +
                          9,12; //2nd floor
 +
                          9,13;
 +
                        10,14;
 +
                        11,15;
 +
                        12,16;
 +
                        13,14;//3rd floor
 +
                        14,15;//3rd floor
 +
                        15,16;//3rd floor
 +
                        13,16];//3rd floor
 +
                                                             
 +
//define coordinates (please put orderly)
 +
parameter Real P[:,6]=[-0.3,0.375,0,1,1,1;    //1
 +
                      0.3,0.375,0,1,1,1;    //2
 +
                      0.3,-0.375,0,1,1,1;    //3
 +
                      -0.3,-0.375,0,1,1,1;      //4
 +
                         
 +
                      -0.3,0.375,0.2,0,0,0;  //5
 +
                      0.3,0.375,0.2,0,0,0;  //6
 +
                      0.3,-0.375,0.2,0,0,0;  //7
 +
                      -0.3,-0.375,0.2,0,0,0;    //8
 +
                           
 +
                      -0.3,0.375,0.8,0,0,0;  //9
 +
                      0.3,0.375,0.8,0,0,0;  //10 
 +
                      0.3,-0.375,0.8,0,0,0;  //11
 +
                      -0.3,-0.375,0.8,0,0,0;    //12
 +
                           
 +
                      -0.3,0.375,1.8,0,0,0;  //13
 +
                      0.3,0.375,1.8,0,0,0;  //14
 +
                      0.3,-0.375,1.8,0,0,0;  //15
 +
                      -0.3,-0.375,1.8,0,0,0];  //16
 +
                         
 +
//define external force (please put orderly)
 +
parameter Real F[Points*3]={0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,0,
 +
                            0,0,-1000,
 +
                            0,0,-500,
 +
                            0,0,-500,
 +
                            0,0,-1000};
 +
 +
//solution
 +
Real displacement[N], reaction[N];
 +
Real check[3];
 +
 +
Real stress1[Trusses];
 +
Real safety[Trusses];
 +
Real dis[3];
 +
Real Str[3];
 +
 +
protected
 +
parameter Integer N=3*Points;
 +
Real q1[3], q2[3], g[N,N], G[N,N], G_star[N,N], id[N,N]=identity(N), cx, cy, cz, L, X[3,3];
 +
Real err=10e-10, ers=10e-4;
 +
 +
algorithm
 +
//Creating Global Matrix
 +
G:=id;
 +
for i in 1:Trusses loop
 +
for j in 1:3 loop
 +
  q1[j]:=P[C[i,1],j];
 +
  q2[j]:=P[C[i,2],j];
 +
end for;
 +
     
 +
  //Solving Matrix
 +
  L:=Modelica.Math.Vectors.length(q2-q1);
 +
  cx:=(q2[1]-q1[1])/L;
 +
  cy:=(q2[2]-q1[2])/L;
 +
  cz:=(q2[3]-q1[3])/L;
 +
  X:=(Area*Elas/L)*[cx^2,cx*cy,cx*cz;
 +
                    cy*cx,cy^2,cy*cz;
 +
                    cz*cx,cz*cy,cz^2];
 +
 +
  //Transforming to global matrix
 +
  g:=zeros(N,N);
 +
  for m,n in 1:3 loop
 +
    g[3*(C[i,1]-1)+m,3*(C[i,1]-1)+n]:=X[m,n];
 +
    g[3*(C[i,2]-1)+m,3*(C[i,2]-1)+n]:=X[m,n];
 +
    g[3*(C[i,2]-1)+m,3*(C[i,1]-1)+n]:=-X[m,n];
 +
    g[3*(C[i,1]-1)+m,3*(C[i,2]-1)+n]:=-X[m,n];
 +
  end for; 
 +
 +
G_star:=G+g;
 +
G:=G_star;
 +
end for;
 +
 +
//Implementing boundary
 +
for x in 1:Points loop
 +
if P[x,4] <> 0 then
 +
  for a in 1:Points*3 loop
 +
    G[(x*3)-2,a]:=0;
 +
    G[(x*3)-2,(x*3)-2]:=1;
 +
  end for;
 +
end if;
 +
if P[x,5] <> 0 then
 +
  for a in 1:Points*3 loop
 +
    G[(x*3)-1,a]:=0;
 +
    G[(x*3)-1,(x*3)-1]:=1;
 +
  end for;
 +
end if;
 +
if P[x,6] <> 0 then
 +
  for a in 1:Points*3 loop
 +
    G[x*3,a]:=0;
 +
    G[x*3,x*3]:=1;
 +
  end for;
 +
end if;
 +
end for;
 +
 +
//Solving displacement
 +
displacement:=Modelica.Math.Matrices.solve(G,F);
 +
 +
//Solving reaction
 +
reaction:=(G_star*displacement)-F;
 +
 +
//Eliminating float error
 +
for i in 1:N loop
 +
reaction[i]:=if abs(reaction[i])<=err then 0 else reaction[i];
 +
displacement[i]:=if abs(displacement[i])<=err then 0 else displacement[i];
 +
end for;
 +
 +
//Checking Force
 +
check[1]:=sum({reaction[i] for i in (1:3:(N-2))})+sum({F[i] for i in (1:3:(N-2))});
 +
check[2]:=sum({reaction[i] for i in (2:3:(N-1))})+sum({F[i] for i in (2:3:(N-1))});
 +
check[3]:=sum({reaction[i] for i in (3:3:N)})+sum({F[i] for i in (3:3:N)});
 +
 
 +
for i in 1:3 loop
 +
check[i] := if abs(check[i])<=ers then 0 else check[i];
 +
end for;
 +
 +
//Calculating stress in each truss
 +
for i in 1:Trusses loop
 +
for j in 1:3 loop
 +
  q1[j]:=P[C[i,1],j];
 +
  q2[j]:=P[C[i,2],j];
 +
  dis[j]:=abs(displacement[3*(C[i,1]-1)+j]-displacement[3*(C[i,2]-1)+j]);
 +
end for;
 +
     
 +
  //Solving Matrix
 +
  L:=Modelica.Math.Vectors.length(q2-q1);
 +
  cx:=(q2[1]-q1[1])/L;
 +
  cy:=(q2[2]-q1[2])/L;
 +
  cz:=(q2[3]-q1[3])/L;
 +
  X:=(Elas/L)*[cx^2,cx*cy,cx*cz;
 +
                cy*cx,cy^2,cy*cz;
 +
                cz*cx,cz*cy,cz^2];
 +
 
 +
  Str:=(X*dis);
 +
  stress1[i]:=Modelica.Math.Vectors.length(Str);
 +
end for;
 +
 +
//Safety factor
 +
for i in 1:Trusses loop
 +
if stress1[i]>0 then
 +
  safety[i]:=Yield/stress1[i];
 +
else
 +
  safety[i]:=0;
 +
end if;
 +
end for;
 +
 +
end Trusses_3D_Tugas_Besar_Safety;
 +
 +
''''Curve Fitting''''
 +
function Curve_Fitting
 +
 +
input Real X[:];
 +
input Real Y[size(X,1)];
 +
input Integer order=2;
 +
output Real Coe[order+1];
 +
 +
protected
 +
Real Z[size(X,1),order+1];
 +
Real ZTr[order+1,size(X,1)];
 +
Real A[order+1,order+1];
 +
Real B[order+1];
 +
 +
algorithm
 +
 +
for i in 1:size(X,1) loop
 +
for j in 1:(order+1) loop
 +
Z[i,j]:=X[i]^(order+1-j);
 +
end for;
 +
end for;
 +
ZTr:=transpose(Z);
 +
 +
A:=ZTr*Z;
 +
B:=ZTr*Y;
 +
Coe:=Modelica.Math.Matrices.solve(A,B);
 +
 +
end Curve_Fitting;
 
----
 
----
 
''''Hasil Perhitungan Menggunakan OpenModelica''''
 
''''Hasil Perhitungan Menggunakan OpenModelica''''
Line 244: Line 471:
 
Hasil Perhitungan Harga
 
Hasil Perhitungan Harga
 
[[File:edodo9.jpg|450px|center]]
 
[[File:edodo9.jpg|450px|center]]
 +
 +
Sumber: https://tokopedia.link/KcQp5EZ4Ocb

Revision as of 17:17, 6 January 2021

Eduardo Christ Soloman

Biodata Diri

Nama : Eduardo Christ Soloman

NPM  : 1806201182

TTL  : Jakarta, 29 Februari 2000

Hobi : Bersepeda, Baca Komik


Saya adalah mahasiswa FTUI angkatan 2018 dari jurusan Teknik Mesin.

Saya merupakan mahasiswa jurusan teknik mesin. Saya selalu termotivasi untuk mengembangkan kemampuan saya baik akademik maupun non akademik, dengan cara belajar baik di dalam maupun diluar universitas.

Mata Kuliah Metode Numerik

Selama pelajaran metode numerika sebelum uts ini, saya belajar tentang konsep dasar dari metode numerik, dan tentang metode-metode yang dapat kami gunakan dalam perhitungan metode numerik. selain itu, saya juga belajar mengenai pengaplikasian dari metode numerik dalam menyelesaikan problema yang sesungguhnya. terakhir, kami juga belajar mengenai coding yang dipakai pada aplikasi matlab untuk melakukan perhitungan menggunakan metode numerik.

Pertemuan 1 (11 Nov 2020)

Pada pertemuan pertama ini, dipaparkan tujuan belajar Metode Numerik, yakni: 1. Memahami konsep dan prinsip dasar dalam metode numerik. contohnya adalah persamaan aljabar, agoritma, pencocokan kurva, persamaan diferensia, parsial, dan lain lain. 2. Mengerti aplikasi metode numerik. 3. Mampu Menerapkan metode numerik dalam persoalan teknik. 4. Mendapat nilai tambah/adab sehingga kita menjadi orang yang lebih beradab.

Tugas 1

Berikut adalah hasil dari tugas 1 dimana saya diminta untuk membuat video tentang pembelajaran saya mengenai aplikasi openmodelica.

Pertemuan 2 (18 Nov 2020)

Pada pertemuan kedua ini, kami diminta untuk menunjukan apa saja yang sudah kami pelajari tentang Open Modelica. Selain itu, kami juga diajari mengenai hal baru di dalam aplikasi Open Modelica, yakni mengenai kelas panggil serta kelas fungsi. Dalam kelas function, kami bisa membuat input serta output, dan juga membuat algoritma, kemudian dengan menggunakan kelas panggil, kami dapat memanggil input serta output dari kelas function tadi untuk menyelesaikan suatu problema matematika seperti yang kami kerjakan dalam Tugas 2.

Tugas 2

Berikut adalah hasil dari tugas 2 dimana saya diminta untuk membuat video tentang kelas fungsi dalam aplikasi OpenModelica.

Pertemuan 3 (25 Nov 2020)

Pada pertemuan ketiga ini, kami diminta untuk menunjukan hasil mengerjakan tugas 2 kami kemarin, selain itu kami juga diberi tugas untuk mengimplementasikan psuedocode pada Figure 9.4 di modelica yang mana nantinya akan di test coding dengan example 9.5.

Tugas 3

Tugas3-1.jpg
Tugas3-2.jpg
Tugas 3-3.jpg

model No4

parameter Real A= 0.001; //Area parameter Real E= 2*10^11; //Modulus Young parameter Real L1= 1; //Panjang A parameter Real L2= 1; //Panjang B parameter Real L3= 1.6; //Panajang C parameter Real L4= 1.25; //Panjang D parameter Real L5= 1.6; //Panjang E parameter Real T1= 0; parameter Real T2= 0; parameter Real T3= -0.67; parameter Real T4= -1.57; parameter Real T5= -2.25;

Real k1; Real k2; Real k3; Real k4; Real k5; Real K1 [8,8]; Real K2 [8,8]; Real K3 [8,8]; Real K4 [8,8]; Real K5 [8,8];

Real a1 [8,8] = [(cos(T1))^2,sin(T1)*cos(T1),-(cos(T1))^2,-(sin(T1)*cos(T1)),0,0,0,0; 

                sin(T1)*cos(T1),(sin(T1))^2,-(sin(T1)*cos(T1)),-(sin(T1))^2,0,0,0,0;
                -(cos(T1))^2,-(sin(T1)*cos(T1)),(cos(T1))^2,sin(T1)*cos(T1),0,0,0,0;
                -(sin(T1)*cos(T1)),-(sin(T1))^2,sin(T1)*cos(T1),(sin(T1))^2,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0];

Real a2 [8,8] = [0,0,0,0,0,0,0,0; 

                0,0,0,0,0,0,0,0;
                0,0,(cos(T2))^2,sin(T2)*cos(T2),-(cos(T2))^2,-(sin(T2)*cos(T2)),0,0;
                0,0,sin(T2)*cos(T2),(sin(T2))^2,-(sin(T2)*cos(T2)),-(sin(T2))^2,0,0;
                0,0,-(cos(T2))^2,-(sin(T2)*cos(T2)),(cos(T2))^2,sin(T2)*cos(T2),0,0;
                0,0,-(sin(T2)*cos(T2)),-(sin(T2))^2,sin(T2)*cos(T2),(sin(T2))^2,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0];

Real a3 [8,8] = [(cos(T3))^2,sin(T3)*cos(T3),0,0,0,0,-(cos(T3))^2,-(sin(T3)*cos(T3)); 

                sin(T3)*cos(T3),(sin(T3))^2,0,0,0,0,-(sin(T3)*cos(T3)),-(sin(T3))^2;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                -(cos(T3))^2,-(sin(T3)*cos(T3)),0,0,0,0,(cos(T3))^2,sin(T3)*cos(T3);
                -(sin(T3)*cos(T3)),-(sin(T3))^2,0,0,0,0,sin(T3)*cos(T3),(sin(T3))^2];

Real a4 [8,8] = [0,0,0,0,0,0,0,0; 

                0,0,0,0,0,0,0,0;
                0,0,(cos(T4))^2,sin(T4)*cos(T4),0,0,-(cos(T4))^2,-(sin(T4)*cos(T4));
                0,0,sin(T4)*cos(T4),(sin(T4))^2,0,0,-(sin(T4)*cos(T4)),-(sin(T4))^2;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,-(cos(T4))^2,-(sin(T4)*cos(T4)),0,0,(cos(T4))^2,sin(T4)*cos(T4);
                0,0,-(sin(T4)*cos(T4)),-(sin(T4))^2,0,0,sin(T4)*cos(T4),(sin(T4))^2];

Real a5 [8,8] = [0,0,0,0,0,0,0,0; 

                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,0,0,0,0;
                0,0,0,0,(cos(T5))^2,sin(T5)*cos(T5),-(cos(T5))^2,-(sin(T5)*cos(T5));
                0,0,0,0,sin(T5)*cos(T5),(sin(T5))^2,-(sin(T5)*cos(T5)),-(sin(T5))^2;
                0,0,0,0,-(cos(T5))^2,-(sin(T5)*cos(T5)),(cos(T5))^2,sin(T5)*cos(T5);
                0,0,0,0,-(sin(T5)*cos(T5)),-(sin(T5))^2,sin(T5)*cos(T1),(sin(T5))^2];

equation k1= A*E/L1; k2= A*E/L2; k3= A*E/L3; k4= A*E/L4; k5= A*E/L5; K1= k1*a1; K2= k2*a2; K3= k3*a3; K4= k4*a4; K5= k5*a5;

end No4;

Kuis Flowchart dan Diagram Class

Berdasarkan yang saya dapat dari penjelasan josiah mengenai jawabannya untuk tugas 3, saya membuat Class Diagram dan Flowchart berikut

ThumbThumb

Tugas 4

Pr4tin.jpeg

Diagram Class dan Flow Chart

Tugas4Edo.jpg

Pertemuan 4 (16 Desember 2020)

Aplikasi Metode Numerik Dalam Kasus Optimasi

Fungsi yang ingin diselesaikan 

function f_obj3
 import Modelica.Math;
input Real x;
output Real y;

algorithm
 y:= 2*sin(x)-x^2/10;
end f_obj3;

Golden Section Optimization 

model Bracket
 parameter Integer n=8;
 Real x1 [n];
 Real x2 [n];
 Real xup;
 Real xlow;
 Real d;
 Real f1 [n];
 Real f2 [n];
 Real xopt;
 Real yopt;

equation
 xup :=4;
 xlow:=0;

for i in (1:n) loop
 d:= (5^(1/2)-1)/2*(xup-xlow);
 x1[i]:= xlow+d;
 x2[i]:= xup-d;
 f1[i]:= f_obj3(x1[i]);
 f2[i]:= f_obj3(x2[i]);
 
 if f1[i]>f2[i] then
 xup:= xup;
 xlow:= x2[i];
 xopt:= xup;
 yopt:= f1[i];
 
 else
 xlow:= xlow;
 xup:= x1[i];
 xopt:= xup;
 
 end if;
end for;
  
end Bracket;

Tugas Besar

Pendahuluan

Pada tugas besar ini, kami diberikan sebuah tugas untuk melakukan optimisasi pemilihan material dan luas penampang trusses yang akan digunakan untuk membuat konstruksi sebagai berikut:

Tugas Besar Metnum Geometri Jos.jpg

Asumsi yang Digunakan dalam Tugas Besar

Edodo2.jpg
Edodo1.jpg

Variabel bebas/faktor lainnya yang perlu ditentukan adalah jenis material (elastisitas), harga material, dan luas cross section Truss (dengan L profile). Kami diminta untuk mencari optimasi dan membentuk kurva efisiensi harga dengan Curve Fitting, serta menentukan nilai optimum dengan cost terendah.

1. Beban terdistribusi pada node

2. Titik perpotongan antara node 1, node 2, node 3, dan node 4 terletak pada titik pusat koordinat (0,0,0)

3. Jenis material yang digunakan : Stainless Steel AISI 304

4. Panjang truss vertikal 0.6 m per tingkat

'Coding'

'Perhitungan Utama' model Trusses_3D_Tugas_Besar_Safety

//define initial variable parameter Integer Points=size(P,1); //Number of Points parameter Integer Trusses=size(C,1); //Number of Trusses parameter Real Yield=215e6; //Yield Strength (Pa) parameter Real Area=0.000504; //Area L Profile (Dimension=0.04 x 0.05)(Thickness 0.3) (m2) parameter Real Elas=195e9; //Elasticity SS 304 (Pa)

//define connection parameter Integer C[:,2]=[1,5; 

                         2,6;
                         3,7;
                         4,8;
                         5,6;  //1st floor
                         6,7;  //1st floor
                         7,8;  //1st floor
                         5,8;  //1st floor
                         5,9;
                        6,10;
                        7,11;
                        8,12;
                        9,10; //2nd floor
                        10,11;//2nd floor 
                        11,12;//2nd floor
                         9,12; //2nd floor
                         9,13;
                        10,14;
                        11,15;
                        12,16;
                        13,14;//3rd floor
                        14,15;//3rd floor
                        15,16;//3rd floor
                       13,16];//3rd floor

//define coordinates (please put orderly) parameter Real P[:,6]=[-0.3,0.375,0,1,1,1; //1 

                      0.3,0.375,0,1,1,1;    //2
                      0.3,-0.375,0,1,1,1;     //3
                      -0.3,-0.375,0,1,1,1;      //4
                          
                      -0.3,0.375,0.2,0,0,0;   //5
                      0.3,0.375,0.2,0,0,0;  //6
                      0.3,-0.375,0.2,0,0,0;   //7
                      -0.3,-0.375,0.2,0,0,0;    //8
                           
                      -0.3,0.375,0.8,0,0,0;   //9
                      0.3,0.375,0.8,0,0,0;  //10  
                      0.3,-0.375,0.8,0,0,0;   //11
                      -0.3,-0.375,0.8,0,0,0;    //12
                           
                      -0.3,0.375,1.8,0,0,0;   //13
                      0.3,0.375,1.8,0,0,0;  //14
                      0.3,-0.375,1.8,0,0,0;   //15
                      -0.3,-0.375,1.8,0,0,0];   //16

//define external force (please put orderly) parameter Real F[Points*3]={0,0,0, 

                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,0, 
                           0,0,-1000, 
                           0,0,-500, 
                           0,0,-500, 
                           0,0,-1000};

//solution Real displacement[N], reaction[N]; Real check[3];

Real stress1[Trusses]; Real safety[Trusses]; Real dis[3]; Real Str[3];

protected parameter Integer N=3*Points; Real q1[3], q2[3], g[N,N], G[N,N], G_star[N,N], id[N,N]=identity(N), cx, cy, cz, L, X[3,3]; Real err=10e-10, ers=10e-4;

algorithm //Creating Global Matrix G:=id; for i in 1:Trusses loop 

for j in 1:3 loop
 q1[j]:=P[C[i,1],j];
 q2[j]:=P[C[i,2],j];
end for;
     
  //Solving Matrix
  L:=Modelica.Math.Vectors.length(q2-q1);
  cx:=(q2[1]-q1[1])/L;
  cy:=(q2[2]-q1[2])/L;
  cz:=(q2[3]-q1[3])/L; 
  X:=(Area*Elas/L)*[cx^2,cx*cy,cx*cz;
                    cy*cx,cy^2,cy*cz;
                    cz*cx,cz*cy,cz^2];

  //Transforming to global matrix
  g:=zeros(N,N); 
  for m,n in 1:3 loop
    g[3*(C[i,1]-1)+m,3*(C[i,1]-1)+n]:=X[m,n];
    g[3*(C[i,2]-1)+m,3*(C[i,2]-1)+n]:=X[m,n];
    g[3*(C[i,2]-1)+m,3*(C[i,1]-1)+n]:=-X[m,n];
    g[3*(C[i,1]-1)+m,3*(C[i,2]-1)+n]:=-X[m,n];
  end for;  

G_star:=G+g;
G:=G_star;

end for;

//Implementing boundary for x in 1:Points loop 

if P[x,4] <> 0 then
  for a in 1:Points*3 loop
    G[(x*3)-2,a]:=0;
    G[(x*3)-2,(x*3)-2]:=1;
  end for;
end if;
if P[x,5] <> 0 then
  for a in 1:Points*3 loop
    G[(x*3)-1,a]:=0;
    G[(x*3)-1,(x*3)-1]:=1;
  end for;
end if;
if P[x,6] <> 0 then
  for a in 1:Points*3 loop
    G[x*3,a]:=0;
    G[x*3,x*3]:=1;
  end for;
end if;

end for;

//Solving displacement displacement:=Modelica.Math.Matrices.solve(G,F);

//Solving reaction reaction:=(G_star*displacement)-F;

//Eliminating float error for i in 1:N loop 

reaction[i]:=if abs(reaction[i])<=err then 0 else reaction[i];
displacement[i]:=if abs(displacement[i])<=err then 0 else displacement[i];

end for;

//Checking Force check[1]:=sum({reaction[i] for i in (1:3:(N-2))})+sum({F[i] for i in (1:3:(N-2))}); check[2]:=sum({reaction[i] for i in (2:3:(N-1))})+sum({F[i] for i in (2:3:(N-1))}); check[3]:=sum({reaction[i] for i in (3:3:N)})+sum({F[i] for i in (3:3:N)});

for i in 1:3 loop 

check[i] := if abs(check[i])<=ers then 0 else check[i];

end for;

//Calculating stress in each truss for i in 1:Trusses loop for j in 1:3 loop 

 q1[j]:=P[C[i,1],j];
 q2[j]:=P[C[i,2],j];
 dis[j]:=abs(displacement[3*(C[i,1]-1)+j]-displacement[3*(C[i,2]-1)+j]);

end for; 

  //Solving Matrix
  L:=Modelica.Math.Vectors.length(q2-q1);
  cx:=(q2[1]-q1[1])/L;
  cy:=(q2[2]-q1[2])/L;
  cz:=(q2[3]-q1[3])/L; 
  X:=(Elas/L)*[cx^2,cx*cy,cx*cz;
               cy*cx,cy^2,cy*cz;
               cz*cx,cz*cy,cz^2];
  
  Str:=(X*dis);
  stress1[i]:=Modelica.Math.Vectors.length(Str);

end for;

//Safety factor for i in 1:Trusses loop 

if stress1[i]>0 then
  safety[i]:=Yield/stress1[i];
else
  safety[i]:=0;
end if;

end for;

end Trusses_3D_Tugas_Besar_Safety;

'Curve Fitting' function Curve_Fitting

input Real X[:]; input Real Y[size(X,1)]; input Integer order=2; output Real Coe[order+1];

protected Real Z[size(X,1),order+1]; Real ZTr[order+1,size(X,1)]; Real A[order+1,order+1]; Real B[order+1];

algorithm

for i in 1:size(X,1) loop 

for j in 1:(order+1) loop
Z[i,j]:=X[i]^(order+1-j);
end for;

end for; ZTr:=transpose(Z);

A:=ZTr*Z; B:=ZTr*Y; Coe:=Modelica.Math.Matrices.solve(A,B);

end Curve_Fitting;

'Hasil Perhitungan Menggunakan OpenModelica'

Displacement

Edodo3.png
Edodo4.png

Reaction

Edodo5.png
Edodo6.png

Safety Factor

Edodo7.png

Stress pada Tiap Truss

Edodo8.png

Hasil Perhitungan Harga

Edodo9.jpg

Sumber: https://tokopedia.link/KcQp5EZ4Ocb

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