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authorSiddharth112352019-09-03 18:09:16 +0530
committerSiddharth112352019-09-03 18:09:16 +0530
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+model Flight_Dynamics_Test
+import Modelica.Math.Matrices.*;
+import Modelica.SIunits.*;
+import Modelica.Blocks.Interfaces.*;
+import Modelica.Math.Vectors.*;
+
+function T1
+
+ input Real a;
+ output Real T[3,3];
+algorithm
+ T := {{ 1, 0, 0}, { 0, cos(a), sin(a)},{ 0,-sin(a), cos(a)}};
+end T1;
+
+function T2
+ input Real a;
+ output Real T[3,3];
+algorithm
+ T := {{ cos(a), 0,-sin(a)}, { 0, 1, 0},{ sin(a), 0, cos(a)}};
+end T2;
+
+function T3
+ input Real a;
+ output Real T[3,3];
+algorithm
+ T := {{ cos(a), sin(a), 0},{-sin(a), cos(a), 0},{ 0, 0, 1}};
+end T3;
+
+
+
+
+
+
+parameter Real alphazero = 0.010576161309471;
+
+parameter Real delta[3] = {0,-0.0304977268414434,0};
+parameter Real thrust[3] = {1526.49255280348 , 0, 0};
+
+
+Real[3] omega ( start = {0, 0, 0});
+Real[3] pos (start = {0, 0, -1000});
+Real[3] v (start = {60*cos(alphazero), 0, 60*sin(alphazero)});
+Real[3] angles ;
+Real[3] Force;//Forces
+
+Real[3] Moment;//Moments
+
+
+
+parameter Real m = 1043.26;
+parameter Real s = 16.1651;//reference area
+parameter Real cbar = 1.493 ;//average chord
+parameter Real b = 10.911 ;//span
+parameter Real W[3] = m*{0,0, -9.8};//gravitational force
+Real CL; //Coeff of Lift
+Real CD;//Coeff of Drag
+//Real CY;//Coeff of Sideslip
+//Real Cl;//Roll coeff
+Real Cm;//Pitch coeff
+//Real Cn;//Yaw coeff
+
+
+//// environmental constants
+parameter Real rho = 1.225; // air desnsity
+parameter Real g = 9.81; // gravity
+
+
+
+
+
+
+//weight
+
+//// aerodynamic coefficients
+// drag
+parameter Real CD0 = 0.036;
+parameter Real K_drag = 0.0830304;
+parameter Real CD_beta = 0.17;
+
+//side force
+parameter Real Cy_beta = -0.31;
+parameter Real Cy_p = -0.037;
+parameter Real Cy_r = 0.21;
+parameter Real Cy_delta_r = 0.187;
+parameter Real Cy_delta_a = 0;
+
+// lift
+parameter Real CL0 = 0.25;
+parameter Real CL_alpha = 4.47;
+parameter Real CL_q = 3.9;
+parameter Real CL_delta_e = 0.3476;
+
+// rolling moment
+parameter Real Cl_beta = -0.089;
+parameter Real Cl_p = -0.47;
+parameter Real Cl_r = 0.096;
+parameter Real Cl_delta_a = -0.09;
+parameter Real Cl_delta_r = 0.0147;
+
+// pitching moment
+parameter Real Cm0 = -0.02;
+parameter Real Cm_alpha = -1.8;
+parameter Real Cm_q = -12.4;
+parameter Real Cm_delta_e = -1.28;
+
+// yawing moment
+parameter Real Cn_beta = 0.065;
+parameter Real Cn_p = -0.03;
+parameter Real Cn_r = -0.99;
+parameter Real Cn_delta_a = -0.0053;
+parameter Real Cn_delta_r = -0.0657;
+
+
+parameter Real[3,3] J = {{1285.31, 0, 0}, {0, 1824.93, 0}, {0, 0, 2666.893}};//Moment of Inertia
+
+Real vdot[3];//Linear Acceleration
+Real omegadot[3];//Angular acceleration
+Real OMEGA[3,3] = skew(omega);//Skew symmetric matrix form of the angular velocity term
+Real DCM[3,3] = T1(angles[1])*T2(angles[2])*T3(angles[3]);//The direction cosine matrix
+Real Rotation_mat[3,3] = {{1, tan(angles[2])*sin(angles[1]), tan(angles[2])*cos(angles[1])}, {0, cos(angles[1]), -sin(angles[1])},{0, sin(angles[1])/cos(angles[2]) , cos(angles[1])/cos(angles[2])}};
+Real euler_rates[3];
+
+
+
+Real L;
+Real D;
+
+Real Q;
+Real alpha;
+Real alphadot;
+
+
+initial equation
+alpha = alphazero;
+angles[2] = alphazero;
+
+
+
+equation
+alpha = atan2(v[3],v[1]);
+alphadot = der(alpha);
+Q=0.5*rho*norm(v)*norm(v);
+CL = CL0+CL_alpha*alpha+((CL_q*omega[2]*cbar)/(2*norm(v)))+CL_delta_e*delta[2];
+Cm = Cm0+Cm_alpha*alpha+((Cm_q*omega[2]*cbar)/(2*norm(v)))+Cm_delta_e*delta[2];
+CD = CD0+K_drag*CL^2;
+
+L = CL*s*Q;
+D = CD*s*Q;
+
+Moment[2] = Cm*s*cbar*Q;
+Moment[1] = 0;
+Moment[3] = 0;
+
+Force[1] = -D*cos(alpha)+L*sin(alpha)+thrust[1] - m*g*sin(angles[2]);
+Force[3] = -D*sin(alpha)-L*cos(alpha)+m*g*cos(angles[2]);
+Force[2] = 0;
+
+
+vdot = 1 / m * Force + OMEGA * v;
+der(v) = vdot;
+der(pos) = inv(DCM)*v;
+omegadot = inv(J) * (Moment- OMEGA * J * omega);
+der(omega) = omegadot;
+euler_rates = Rotation_mat * omega;
+der(angles) = euler_rates;
+
+
+end Flight_Dynamics_Test; \ No newline at end of file