Sasha
0b84e1024c
hello everynyan i hope this fixed the issues, i am worried there might be issues with the RF calculation for the column buckling due to what I got on the feedback, but ill see tomorrow (I am hoping its just a fluke rn)
344 lines
No EOL
12 KiB
Python
344 lines
No EOL
12 KiB
Python
import math
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import csv
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from colorama import just_fix_windows_console
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just_fix_windows_console()
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from colorama import Fore, Back, Style
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#
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# HELLO MODIFY THIS!
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#
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#Hello there! Modify this!
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#INITIAL SET UP
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Ebasis = 65500.00
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mass_limit = 28.000
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#MODIFY THIS EVERY NEW ITERATION
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modAmount = 2 # amount of results you want to iterate through (starts at panel_val_0 and goes to this value minus one)
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# So the highest x of panel_val_x with one added to it. (modAmount = 1 only runs panel_val_0, modAmount = 3 runs through panel_val_0, 1 and 2)
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# 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16
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pThickness_01 = [ 4, 5] # panel 1 and 10
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pThickness_02 = [ 4, 5] # panel 2 and 9
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pThickness_03 = [ 4, 5] # panel 3 and 8
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pThickness_04 = [ 4, 5] # panel 4 and 7
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pThickness_05 = [ 4, 6] # panel 5 and 6
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# 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16
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dim1_0 = [25,70]
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dim2_0 = [ 2, 2]
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dim3_0 = [20,10]
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dim4_0 = [15,15]
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# BELOW THIS NOTHING NEEDS TO BE MODIFIED
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def GetValueofElement(ElementID, Loadcase, Valuetype, Fileadress):
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FindTitle = False
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intiated = False
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with open(Fileadress, newline='') as csvfile:
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reader = csv.reader(csvfile, delimiter=',', quotechar="'")
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for row in reader:
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values = row
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#print(values)
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if intiated:
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if str(values[ElemID_ID]) == str(ElementID) and str(values[Loadcase_ID])==str(Loadcase):
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return float(values[Value_ID])*1.5 #Safety Factor here!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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if FindTitle:
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#print(str(values))
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Header = values
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ElemID_ID = Header.index("Elements")
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Loadcase_ID = Header.index("Loadcase")
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Value_ID = Header.index(Valuetype)
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FindTitle = False
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intiated = True
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if len(values)==0:
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FindTitle=True
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return None
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#CONSTANTS
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axial = 'Element Stresses (1D):CBAR/CBEAM Axial Stress'
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# material properties
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sUlt = 530
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sYield = 490
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density = 2.7 * (10 ** -6) #2.7*10^-9 in t/mm^3
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pWidth_0 = [200,200,200,200,200,200,200,200,200,200,200,200,200,200]
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pLength_0 = [750,750,750,750,750,750,750,750,750,750,750,750,750]
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def GetAvgStressofPanel(panelNo, Loadcase, ValueType):
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id = panelNo * 3 - 2
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return (GetValueofElement(id, Loadcase, ValueType, panel) + GetValueofElement(id+1, Loadcase, ValueType, panel) + GetValueofElement(id+2, Loadcase, ValueType, panel))/(3*1.5)
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def GetCombAvgStressofStringer(stringerNo, Loadcase):
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id = stringerNo * 3 - 3 + 40
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avgStringerStress = (GetValueofElement(id, Loadcase, axial, stringer) + GetValueofElement(id+1, Loadcase, axial, stringer) + GetValueofElement(id+2, Loadcase, axial, stringer))/(3*1.5)
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leftPID = stringerNo
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rightPID = stringerNo + 1
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leftPStress = GetAvgStressofPanel(leftPID, Loadcase, 'XX')
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rightPStress = GetAvgStressofPanel(rightPID, Loadcase, 'XX')
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return((leftPStress * 0.5 * pThickness[stringerNo - 1] * pWidth + rightPStress * 0.5 * pThickness[stringerNo]*pWidth + avgStringerStress * areaStringer) / (areaStringer + 0.5*pThickness[stringerNo-1] * pWidth + 0.5 * pThickness[stringerNo]*pWidth))
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def GetAlpha(x):
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if(0.4 <= x <= 1.095):
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alpha = 1.4 - 0.628 * x
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elif(1.095 < x <= 1.633):
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alpha = 0.78/x
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elif(x > 1.633):
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alpha = 0.69/(x**0.75)
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else:
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alpha = 0
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return(alpha)
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def GetSigCrip(stringerNo, Loadcase): ## unfinished, need to understand x claulcation still a bit
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#use b1 and b2 for calc
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#E_c = Ebasis
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#no alpha = 1 it is none -> what do then? -> ignore that element in averaging
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#averaging only with elements that cripple
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#if nothing cripples, use yield strength
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b1 = dim1 - dim2
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b2 = dim3 - dim2
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x1 = (b1/dim2)*math.sqrt(sYield/(3.60*Ebasis))
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alpha1 = GetAlpha(x1)
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#print("x12: " + str(x))
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sigCrip1 = alpha1 * sYield
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x2 = (b2/dim2)*math.sqrt(sYield/(3.60*Ebasis))
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alpha2 = GetAlpha(x2)
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sigCrip2 = alpha2 * sYield
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if(alpha1 != 0 and alpha2 != 0):
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sigCripAVG = (sigCrip1 * b1 * dim2 + sigCrip2 * b2 * dim2 * 2)/(b1 * dim2 + b2 * dim2 * 2)
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elif(alpha1 != 0):
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sigCripAVG = (sigCrip1 * b1 * dim2)/(b1 * dim2)
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elif(alpha2 != 0):
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sigCripAVG = (sigCrip2 * b2 * dim2)/(b2 * dim2)
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else:
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sigCripAVG = sYield
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# average only over what can buckle!!! F/A, A = sumOf(bi*ti)
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return min(sigCripAVG, sYield)
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def kBiax(panelNo,Loadcase):
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beta = GetAvgStressofPanel(panelNo, Loadcase, 'YY')/GetAvgStressofPanel(panelNo, Loadcase, 'XX')
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kSigX = 100000000
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for m in range(1, 10):
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for n in range(1, 100):
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kTemp = (m*m+n*n*alpha*alpha)*(m*m+n*n*alpha*alpha)/(alpha*alpha*(m*m+beta*n*n*alpha*alpha))
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if(0 < kTemp < kSigX):
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kSigX = kTemp
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return(kSigX)
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def RF_panel(panelNo, Loadcase):
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sE = ((pThickness[panelNo-1]/pWidth)**2) * Ebasis * math.pi * math.pi / (12*(1-(0.34*0.34)))
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#print(sE)
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rfBiax = (kBiax(panelNo, Loadcase)*sE)/abs(1.5*GetAvgStressofPanel(panelNo, Loadcase, 'XX'))
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rfShear = (kShear*sE)/abs(1.5*GetAvgStressofPanel(panelNo, Loadcase, 'XY'))
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result = 1 / ( (1 / rfBiax) + (1 / (rfShear*rfShear)))
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#print(rfBiax)
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#print(rfShear)
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return(result)
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def GetLambda(stringerNo):
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I_comb = GetIcomb(i)
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r_gyr = math.sqrt(I_comb/(areaStringer + 0.5 * pThickness[i] * pWidth + 0.5 * pThickness[i+1] * pWidth))
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c = 1
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return(1*pLength/r_gyr)
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def GetSigCRIT(stringerNo, Loadcase):
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sLambda_crit = math.sqrt((2*math.pi*math.pi*Ebasis)/GetSigCrip(i,0))
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if(GetLambda(stringerNo)<sLambda_crit):
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return(GetSigCrip(stringerNo, Loadcase) - ((1/Ebasis)*((GetSigCrip(stringerNo, Loadcase)/(2*math.pi))**2)*(GetLambda(stringerNo)**2)))
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else:
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return((math.pi**2)*Ebasis / (GetLambda(stringerNo) ** 2))
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def GetRFstringer(stringerNo, Loadcase):
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return(abs(GetSigCRIT(stringerNo, Loadcase)/(1.5*GetCombAvgStressofStringer(stringerNo, Loadcase))))
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def GetCrosssectionValues(i):
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I_comb = GetIcomb(i)
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r_gyr = math.sqrt(I_comb/(areaStringer + 0.5 * pThickness[i] * pWidth + 0.5 * pThickness[i+1] * pWidth))
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c = 1
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sLambda = c*pLength/r_gyr
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sLambda_crit = math.sqrt((2*math.pi*math.pi*Ebasis)/GetSigCrip(i, 0)) # IMPORTANT THIS IS ONLY FOR S crip above 490
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return(str(I_comb) + "," + str(r_gyr) + "," + str(sLambda) + "," + str(sLambda_crit))
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def GetIcomb(i):
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wing_1_w = pWidth/2
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wing_2_w = pWidth/2
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wing_1_t = pThickness[i]
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wing_2_t = pThickness[i+1]
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z1 = -dim1/2
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z3 = -(dim1-(dim2/2))
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z4 = -dim2/2
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y1 = ((dim3/2)-(dim2/2))
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y3 = 0
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y4 = dim3+(dim4/2)
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zw_1 = wing_1_t/2
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zw_2 = wing_2_t/2
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yw_1 = 50
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yw_2 = -50
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a1 = dim1*dim2
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a3 = dim2*(dim3-dim2-dim2)
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a4 = dim4*dim2
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aw_1 = wing_1_w * wing_1_t
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aw_2 = wing_2_t * wing_2_w
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Iyy1 = (dim2*(dim1**3))/12
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Izz1 = (dim1*(dim2**3))/12
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Iyy3 = ((dim3-dim2-dim2)*(dim2**3))/12
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Izz3 = (((dim3-dim2-dim2)**3)*(dim2))/12
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Iyy4 = (dim4*(dim2**3))/12
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Izz4 = (dim2*(dim4**3))/12
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Iw_1_yy = (wing_1_w*(wing_1_t**3))/12
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Iw_1_zz = (wing_1_t*(wing_1_w**3))/12
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Iw_2_yy = (wing_2_w*(wing_2_t**3))/12
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Iw_2_zz = (wing_2_t*(wing_2_w**3))/12
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z_c = (z1*a1+z1*a1+z3*a3+z4*a4+z4*a4+zw_1*aw_1+zw_1*aw_2)/(a1+a1+a3+a4+a4+aw_1+aw_2)
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y_c = (-y1*a1+y1*a1+y3*a3+(-y4*a4)+y4*a4+yw_1*aw_1+yw_2*aw_2)/(a1+a1+a3+a4+a4+aw_1+aw_2)
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Iyy = (Iyy1+((z1-z_c)**2)*a1)+(Iyy1+((z1-z_c)**2)*a1)+(Iyy3+((z3-z_c)**2)*a3)+(Iyy4+((z4-z_c)**2)*a4)+(Iyy4+((z4-z_c)**2)*a4)+(Iw_1_yy+((zw_1-z_c)**2)*aw_1)+(Iw_2_yy+((zw_2-z_c)**2)*aw_2)
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Izz = (Izz1+((y1-y_c)**2)*a1)+(Izz1+((-y1-y_c)**2)*a1)+(Izz3+((y3-y_c)**2)*a3)+(Izz4+((y4-y_c)**2)*a4)+(Izz4+((-y4-y_c)**2)*a4)+(Iw_1_zz+((yw_1-y_c)**2)*aw_1)+(Iw_2_zz+((yw_2-y_c)**2)*aw_2)
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if(Iyy > Izz):
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return(Izz)
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else:
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return(Iyy)
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for u in range(modAmount):
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isWithinRF = 1
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panel = 'panel_val_' + str(u) +'.csv'
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stringer = 'stringer_val_' + str(u) + '.csv'
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# dimensions
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pThickness = [pThickness_01[u], pThickness_02[u], pThickness_03[u], pThickness_04[u], pThickness_05[u], pThickness_05[u], pThickness_04[u], pThickness_03[u], pThickness_02[u], pThickness_01[u]]
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pWidth = pWidth_0[u]
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pLength = pLength_0[u]
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dim1 = dim1_0[u]
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dim2 = dim2_0[u]
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dim3 = dim3_0[u]
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dim4 = dim4_0[u]
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areaStringer = dim4 * dim2 * 2 + (dim1 - dim2) * dim2 * 2 + dim3 * dim2
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print("\n\n" + Back.CYAN + "Calculations for iteration " + str(u) + Style.RESET_ALL)
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print("\n Panel Thickness 1 & 10: " + str(pThickness[0]) + "\n Panel Thickness 2 & 9: " + str(pThickness[1]) + "\n Panel Thickness 3 & 8: " + str(pThickness[2]) + "\n Panel Thickness 4 & 7: " + str(pThickness[3]) + "\n Panel Thickness 5 & 6: " + str(pThickness[4]) + "\n Panel Width: " + str(pWidth) + "\n Panel Length: " + str(pLength) + "\n\n Dim 1: " + str(dim1) + "\n Dim2: " + str(dim2) + "\n Dim 3: "+ str(dim3) + "\n Dim 4: "+ str(dim4))
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#print("\n Panel Offset: " + str(pThickness/2) + "\n Stringer Offset: " + str(dim1/2))
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mass = density*(areaStringer*pLength*9) # + 10*pWidth*pThickness*pLength)
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for i in range(10):
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mass = mass + pWidth*pThickness[i]*density*pLength
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if(mass<mass_limit):
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print("\n\n Mass: " + Back.GREEN + str(mass) + Style.RESET_ALL)
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else:
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print("\n\n Mass: " + Back.RED + str(mass) + Style.RESET_ALL)
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isWithinRF = 0
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# REMEMBER SAFETY FACTOR OF 1.5 ALREADY INCLUDED
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# RF calculator for panels
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for c in range(1,4):
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print("\nPanel RF for loadcase " + str(c))
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for i in range(1, 31):
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w = sUlt/GetValueofElement(i,c,'vonMises',panel)
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if(w>1):
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print(Back.GREEN + str(w) + Style.RESET_ALL)
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else:
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print(Back.RED + str(w) + Style.RESET_ALL)
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isWithinRF = 0
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print(" ")
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# RF calculator for stringers
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for c in range(1,4):
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print("\nStringer RF for loadcase " + str(c))
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for i in range(40,67):
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w = abs(sUlt/GetValueofElement(i,c,axial,stringer))
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if(w>1):
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print(Back.GREEN + str(w) + Style.RESET_ALL)
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else:
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print(Back.RED + str(w) + Style.RESET_ALL)
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isWithinRF = 0
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# Stability Analysis
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print("\n\nStability Analysis\nPanel buckling")
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# Panel buckling
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# sig_aa,avg calculator
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alpha = pLength/pWidth
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kShear = 5.34 + 4/(alpha*alpha)
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for c in range(1,4):
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print("\nLoadcase " + str(c) + "\nAverage stress for panels 1 to 5 - XX, YY, XY - k_shear, k_biax, RF_panelbuckl")
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for i in range(1,6):
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w = RF_panel(i,c)
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if(w>1):
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w = Back.GREEN + str(w) + Style.RESET_ALL
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else:
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w = Back.RED + str(w) + Style.RESET_ALL
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isWithinRF = 0
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print(str(GetAvgStressofPanel(i, c, 'XX')) + "," + str(GetAvgStressofPanel(i, c, 'YY')) + "," + str(GetAvgStressofPanel(i, c, 'XY')) + "," + str(kShear) + "," + str(kBiax(i, c)) + "," + str(w))
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# Stringer buckling
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print("\n\nStringer buckling")
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for c in range(1,4):
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print("\nLoadcase " + str(c) + "\nCombined, average axial stress for stringers 1 to 5")
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for i in range(1,6):
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w = GetRFstringer(i,c)
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if(w>1):
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w = Back.GREEN + str(w) + Style.RESET_ALL
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else:
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w = Back.RED + str(w) + Style.RESET_ALL
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isWithinRF = 0
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print(str(GetCombAvgStressofStringer(i,c)) + "," + str(GetSigCrip(i, c)) + "," + str(w)) # no longer slightly off, RF stringer calc still wrong?
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# combined crosssection properties for combined buckling mode
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print("\n\nCombined crosssection properties for combined buckling")
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for i in range(5):
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print(GetCrosssectionValues(i))
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if(isWithinRF == 1):
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print("\n\n" + Back.GREEN + str(u) + " WORKS!" + Style.RESET_ALL)
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else:
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print("\n\n" + Back.RED + str(u) + " FAILURE!" + Style.RESET_ALL)
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#print(GetIcomb())
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## OVERVIEW OF TODO:
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# - improve some sections of code with TODO |