View source: R/anatomicalmassprop.R
density_optimizer | R Documentation |
Function that is used within an optimization routine to select the appropriate torso section density
density_optimizer(x, m_body, A, v_ell, CG_body_x, CG_ell, rho_avg)
x |
a scalar guess at the density of the torso hemi-ellipsoid section (kg/m^3) |
m_body |
a scalar representing the mass of the full torso |
A |
a 2x2 matrix representing the mass and volume calculations of the final two torso section |
v_ell |
a scalar representing the volume of the hemi-ellipsoid |
CG_body_x |
a scalar representing the position of the center of gravity of the full torso along the x axis with the origin at the VRP |
CG_ell |
a scalar representing the position of the center of gravity of the hemi-ellipsoid section along the x axis with the origin at the VRP |
rho_avg |
average density of the full torso |
the squared error between the three section densities and the average torso density
# refer to the vignette library(AvInertia) # load data data(dat_id_curr, package = "AvInertia") data(dat_bird_curr, package = "AvInertia") data(dat_feat_curr, package = "AvInertia") data(dat_bone_curr, package = "AvInertia") data(dat_mat, package = "AvInertia") data(clean_pts, package = "AvInertia") # 1. Determine the center of gravity of the bird's torso (including the legs) dat_torsotail_out = massprop_restbody(dat_id_curr, dat_bird_curr) # 2. Calculate the inertia of the flight feathers about the tip of the calamus feather_inertia <- compute_feat_inertia(dat_mat, dat_feat_curr, dat_bird_curr) # 3. Determine the center of gravity of one of the bird's wings dat_wing_out = massprop_birdwing(dat_id_curr, dat_bird_curr, dat_bone_curr, dat_feat_curr, dat_mat, clean_pts, feather_inertia, plot_var = 0) # Visualize the center of gravity of each wing component in the x and y axis dat_wing_out = massprop_birdwing(dat_id_curr, dat_bird_curr, dat_bone_curr, dat_feat_curr, dat_mat, clean_pts, feather_inertia, plot_var = "yx") # or the y and z axis dat_wing_out = massprop_birdwing(dat_id_curr, dat_bird_curr, dat_bone_curr, dat_feat_curr, dat_mat, clean_pts, feather_inertia, plot_var = "yz") # 4. Combine all data and obtain the center of gravity, moment of inertia # and principal axes of the bird curr_full_bird = combine_inertialprop(dat_torsotail_out,dat_wing_out, dat_wing_out, dat_id_curr, dat_bird_curr, symmetric=TRUE)
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