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Arjo Chakravarty edited this page Nov 30, 2021 · 7 revisions

Welcome to the lrauv wiki!

This is just to document stuff for Arjo (since he has no access to the bitbucket :( and SLACK is just awful to search). Yes he has written this in third person...

Vehicle specs

// Thruster parameters 
   designOmega           = 300 rpm;           //Nominal prop rotation rate
   designPropEff         = 0.86 n/a;          //Nominal prop efficiency
   designSpeed           = 1.0 m/s;           //Nominal speed
   designThrust          = 6.98 N;            //Thrust at nominal omega
   designTorque          = 0.23 N-m;          //Thrust at nominal thrust

// Mass Properties:
   mass                  = 147.8671 kg;       //Flooded Vehicle mass ( x 9.80665 m/s2 = 1450.0 N)
   volume                = 0.144260585365854 m3; //m3 (equals 1450 N buoyancy in 1025 kg/m3 water)
                                                 //excludes buoyancy bladder at default setting  
// Stability Derivatives:
   effDragCoef           = .21 n/a;           //veh drag in x; related to Xuu
   Xuabu                 = -6.2282 kg/m;      //Force Derivative, > -6.98 kg/m because fin drag added separately

// Geometric Parameters (Used only by the simulation)
   centerOfMassX         = 0.1181 m;
   centerOfMassY         = -0.000236 m;
   centerOfMassZ         = 0.006794 m;
   centerOfBuoyX         = 0.1181 m;
   centerOfBuoyY         = 0.0 m;
   centerOfBuoyZ         = 0.0 m;

// Simple geometric model of vehicle (Used at the surface)
   cylinderLength        = 2 m;
   cylinderRadius        = 6 in;
   lowerRudX             = -1.973 m;
   lowerRudY             = 0.012 m;
   lowerRudZ             = -0.152 m;
   upperRudX             = -1.973 m;
   upperRudY             = 0.012 m;
   upperRudZ             = 0.152 m;
   portElevX             = -1.973 m;
   portElevY             = -0.152 m;
   portElevZ             = 0.0 m;
   stbdElevX             = -1.973 m;
   stbdElevY             = 0.152 m;
   stbdElevZ             = 0.0 m;

// Dropweight1 parameters
   dropWt1Mass           = 1.0 kg;            //Mass of the drop weight #1, kg
   dropWt1Volume         = 0.0000881 m3;      //Volume of the drop weight #1, m3
   dropWt1X              = 0.1655 m;          //X location of the drop weight #1, m
   dropWt1Y              = 0.0 m;             //Y location of the drop weight #1, m
   dropWt1Z              = -0.20 m;           //Z location of the drop weight #1, m

// Mass shift control values
   movableMass           = 26 kg;             // Kilograms of movable mass (~ 1/3 of vehicle mass )
   centerOfMovableMassX = 0.1181 m;
   centerOfMovableMassY = -0.000236 m;
   centerOfMovableMassZ = 0.006794 m;
   // Mass Properties:
   Ixx    =    3.000000 kg-m2;  // Ixx, kg-m^2.
   Iyy    =   41.980233 kg-m2;  // Iyy, kg-m^2.
   Izz    =   41.980233 kg-m2;  // Izz, kg-m^2.
   // Added Mass:
   Kpdot  =    0.000000 kg-m2;  // Kpdot, kg-m^2.
   Kvdot  =    0.000000 kg-m;   // Kvdot, kg-m.
   Mqdot  =  -33.463086 kg-m2;  // Mqdot, kg-m^2.
   Mwdot  =    7.117842 kg-m;   // Mwdot, kg-m.
   Nrdot  =  -33.463086 kg-m2;  // Nrdot, kg-m^2.
   Nvdot  =   -7.117842 kg-m;   // Nvdot, kg-m.
   Xudot  =   -4.876161 kg;     // Xudot, kg.
   Ypdot  =    0.000000 kg-m;   // Ypdot, kg-m.
   Yrdot  =   -7.117842 kg-m;   // Yrdot, kg-m.
   Yvdot  = -126.324739 kg;     // Yvdot, kg.
   Zqdot  =    7.117842 kg-m;   // Zqdot, kg-m.
   Zwdot  = -126.324739 kg;     // Zwdot, kg.
   // Stability Derivatives:
   Kpabp =   -0.191601 kg-m2;  // Kp|p| , kg-m^2
   Mpr   =   33.463086 kg-m2;  // Mpr   , kg-m^2
   Mqabq = -632.698957 kg-m2;  // Mq|q| , kg-m^2
   Muq   =  -61.182063 kg-m;   // Muq   , kg-m
   Muw   =  105.660262 kg;     // Muw   , kg
   Mwabw =  -58.113144 kg;     // Mw|w| , kg
   Npq   =  -33.463086 kg-m2;  // Npq   , kg-m^2
   Nrabr = -632.698957 kg-m2;  // Nr|r| , kg-m^2*rad^2
   Nur   =  -61.182063 kg-m;   // Nur   , kg-m
   Nuv   = -105.660262 kg;     // Nuv   , kg
   Nvabv =   58.113144 kg;     // Nv|v| , kg
   Xqq   =    7.117842 kg-m;   // Xqq   , kg-m
   Xrr   =    7.117842 kg-m;   // Xrr   , kg-m
   Xvr   =  126.324739 kg;     // Xvr   , kg
   Xvv   =  -54.370919 kg/m;   // Xvv   , kg/m
   Xwq   = -126.324739 kg;     // Xwq   , kg
   Xww   =  -54.370919 kg/m;   // Xww   , kg/m
   Yrabr =    0.000000 n/a;    // Yr|r| , ?
   Yur   =    8.719853 kg;     // Yur   , kg
   Yuv   =  -23.954759 kg/m;   // Yuv   , kg/m
   Yvabv = -601.274653 kg/m;   // Yv|v| , kg/m
   Ywp   =  126.324739 kg-m;   // Ywp   , kg-m
   Zqabq =    0.000000 n/a;    // Zq|q| , ?
   Zuq   =   -8.719853 kg;     // Zuq   , kg
   Zuw   =  -23.954759 kg/m;   // Zuw   , kg/m
   Zvp   = -126.324739 kg;     // Zvp   , kg
   Zwabw = -601.274653 kg/m;   // Zw|w| , kg/m
   Kvt2  =    0.000000 n/a;    // ?     , ?
   // Actuator (Tailcone) Parameters:
   stallAngle     =   30.000000 arcdeg;
   wideHystRud    =    0.000000 arcdeg;
   centerHystRud  =    0.000000 arcdeg;
   speedRud       =    7.5      arcdeg/s
   wideHystElev   =    0.000000 arcdeg;
   centerHystElev =    0.000000 arcdeg;
   speedElev      =    7.5      arcdeg/s
   aspectRatio    =    6.500000 n/a;
   finArea        =    0.012189 m2;
   CDc            =    0.030000 n/a;     // Crossflow Coef. of Drag
   dCL            =    4.130000 n/a;     // Coef. of Lift Slope