rocketpal.utilities.config_calc module

rocketpal.utilities.config_calc.calculate_center_of_mass(parts)

Calculate the center of mass of a list of parts

Parameters:

parts (list[Part]) – List of parts

Returns:

The center of mass of the parts in the format (x, y, z)

Return type:

tuple[float, float, float]

rocketpal.utilities.config_calc.grainCom(grain_num, grain_h, grain_sep)

grain_num: amount of grains in motor grain_h: height of grain(longitudinal) in m grain_sep: seperation gap between grains in m

grainCOM: center of mass of grain in m !0.087m offset from nozzle position(aft end) to first grain;

also used for center of mass for dry mass(might be later inputted from CAD model)

Parameters:

• grain_num (int)

• grain_h (float)

• grain_sep (float)

Return type:

float

rocketpal.utilities.config_calc.grainDensity(propWeight, grain_num, grain_h, grain_or, grain_ir)

propWeight: propellant weight in kg grain_num: amount of grains in motor grain_h: height of grain(longitudinal) in m grain_or: outer radius of grain in m grain_ir: inner radius of grain in m

grainDens: grain density in kg/m^3

Parameters:

• propWeight (float)

• grain_num (int)

• grain_h (float)

• grain_or (float)

• grain_ir (float)

Return type:

float

rocketpal.utilities.config_calc.inertia_component(refPoint, aftEndComp, radialDis, radialDir, diam, len, mass)

Calculate the inertia tensor contribution of one rocket component.

The returned values are the six unique elements of the inertia tensor in the order (I_11, I_22, I_33, I_12, I_13, I_23).

Parameters:

• aftEndComp (float)

• radialDis (float)

• radialDir (float)

• diam (float)

• len (float)

• mass (float)

rocketpal.utilities.config_calc.rocket_cog(aft_end_comps, radial_dis_comps, radial_dir_comps, len_comps, mass_comps)

Calculates the center of gravity of rocket in reference to the aft end of the rocket! Depending on chosen coordinate system this position must be shifted!

aft_end_comps: list of distances of aft ends of components to aft end of rocket

(z component of position); components must be in order of radial_dis_comps, radial_dir_comps, diam_comps, len_comps, mass_comps!

radial_dis_comps: list of radial distances to rocket’s rotational axis in m; components

must be in order of aft_end_comps, radial_dir_comps, diam_comps, len_comps, mass_comps!

radial_dir_comps: list of radial directions in degree (=0°: direction of x-axis of reference point);

components must be in order of aft_end_comps, radial_dis_comps, diam_comps, len_comps, mass_comps!

len_comps: list of lengths/heights of components in m; components must be in order of aft_end_comps, radial_dis_comps,

radial_dir_comps, diam_comps, mass_comps!

mass_comps: list of components masses in kg; components must be in order of aft_end_comps, radial_dis_comps,

radial_dir_comps, diam_comps, len_comps!

rocketCOG: tuple of position of center of gravity of rocket in m

FORMAT: (x,y,z)