Tibeuleu/KozaiLidov
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correct computation of center of mass velocity

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This commit is contained in:
Thibault Barnouin
2021-11-26 17:06:47 +01:00
parent 98fdbaefeb
commit 700b3b6c64
16 changed files with 20 additions and 30 deletions
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20
lib/objects.py
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@@ -101,7 +101,7 @@ class System(Body):
def COMV(self): #return center of mass velocity in cartesian np_array
coord = np.zeros(3)
for body in self.bodylist:
coord = coord + body.v
coord = coord + body.m*body.v
coord = coord/self.M
return coord
@@ -113,25 +113,15 @@ class System(Body):
@property
def LCOM(self): #return angular momentum of the center of mass
LCOM = np.zeros(3)
dr = np.zeros(3)
dv = np.zeros(3)
for body in self.bodylist:
for otherbody in self.bodylist:
if body != otherbody:
dr = body.q-otherbody.q
dv = body.v-otherbody.v
dr = self.bodylist[0].m/self.mu*self.bodylist[0].q
dv = self.bodylist[0].m/self.mu*self.bodylist[0].v
LCOM = self.mu*np.cross(dr,dv)
return LCOM
@property
def ECOM(self): #return mechanical energy of the center of mass
dr = np.zeros(3)
dv = np.zeros(3)
for body in self.bodylist:
for otherbody in self.bodylist:
if body != otherbody:
dr = body.q-otherbody.q
dv = body.v-otherbody.v
dr = self.bodylist[0].m/self.mu*self.bodylist[0].q
dv = self.bodylist[0].m/self.mu*self.bodylist[0].v
ECOM = self.mu/2.*np.linalg.norm(dv)**2 - Ga*self.M*self.mu/np.linalg.norm(dr)
return ECOM