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FLYWHEEL CALCULATIONS The flywheel design is based on calculating the EXCESS ENERGY. This is achieved when then the CYCLE IS COMPLETE and when you click.

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Presentation on theme: "FLYWHEEL CALCULATIONS The flywheel design is based on calculating the EXCESS ENERGY. This is achieved when then the CYCLE IS COMPLETE and when you click."— Presentation transcript:

1 FLYWHEEL CALCULATIONS The flywheel design is based on calculating the EXCESS ENERGY. This is achieved when then the CYCLE IS COMPLETE and when you click on the FORCES in the VIEW MENU. Each time you click on the FORCES item the procedure is activated. procedure TMainForm.MenuItem_ForcesClick(Sender: TObject); begin if ThecycleIsComplete(MenuItem_DesignEngineComponents) then CalculateForces(MeanForce,CutAng); end;

2 CalculateForces(MeanForce,CutAng) As you can see, this procedure returns the Mean Tangential Force and the cutting angles CutAng[1] to CutAng[5] or less (more than 5 cuts is not anticipated). These variables are local to the MAIN UNIT so if you want to use them in another unit you should carry their declarations to the INTERFACE section of this unit and your local unit should include “MAIN” in its uses clause. As a bonus the procedure also calculates the Global variable as well. So that’s it ! I’ve done it for you. Now if you are wondering how I did it then here is the algorithm :

3 procedure CalculateForces(var AverageTangentialForce:real; var cutpoint: CutArray); var i,j,cutnumber : Integer; MrW2,Theta,x,y,Sum,x1,x2,y1,y2,y0 : Real; n,k,m : integer; Cross,EndOfCurve,descending : Boolean; c,cb : carray; MinimumValue,mD2,mx,FlywheelMass,D : real; s : string; Volume,Dx : real; begin for i := 1 to 5 do begin c[i] := 0; cb[i] := 0; CutPoint[i] := ''; end; The local arrays are initialized

4 InputReciprocatingMass; i := 1; n := Trunc(NCyl); j := 72 div n; MrW2 := -ReciprocatingMass * sqr(EngineSpeed * PI / 30) * (Stroke/2)/1000; Theta := 0; while Theta <= 720 do begin x := Radian(Theta); y := Arcsin((1/CRRatio)*Sin(x)); GasForce[i] := Fg(Theta); InertiaForce[i] := MrW2 * (Cos(x) + (1/CRRatio) * Cos(2*x)); ResultantForce[i] := GasForce[i]+InertiaForce[i]; TangentialForce[i] := ResultantForce[i]*Sin(x+y)/Cos(y); Theta := Theta + 10; Inc(i); end; The reciprocating mass is calculated The forces are calculated. The Tangengial Forces will be used in our calculations

5 MinimumValue := 0; for i := 1 to j+1 do begin Sum := 0; for k := 1 to n do Sum := Sum + TangentialForce[i+(k-1)*j]; CrankTangentialForce[i] := Sum; if CrankTangentialForce[i]

6 i := 1; m := 1; if CrankTangentialForce[i]

7 if Cross then begin x1 := (i-2)*10; x2 := (i-1)*10; y1 := CrankTangentialForce[i-1]; y2 := CrankTangentialForce[i]; y0 := AverageTangentialForce; c[m] := x2 - ((y2-y0)/(y2-y1))*(x2-x1); str(c[m]:5:2,s); CutPoint[m] := s; inc(m); end; if iAverageTangentialForce then Cross := true; if i=j+1 then EndOfCurve := true; until Cross or EndOfCurve; The cutting angles of the average tangential force and the varying tangential force are calculated (continued)

8 if Cross then begin x1 := (i-2)*10; x2 := (i-1)*10; y1 := CrankTangentialForce[i-1]; y2 := CrankTangentialForce[i]; y0 := AverageTangentialForce; c[m] := x2 - ((y2-y0)/(y2-y1))*(x2-x1); str(c[m]:5:2,s); CutPoint[m] := s; inc(m); end; end else while iAverageTangentialForce then Cross := true; if i=j+1 then EndOfCurve := true; until Cross or EndOfCurve; The cutting angles of the average tangential force and the varying tangential force are calculated (continued)

9 if Cross then begin x1 := (i-2)*10; x2 := (i-1)*10; y1 := CrankTangentialForce[i-1]; y2 := CrankTangentialForce[i]; y0 := AverageTangentialForce; c[m] := x2 - ((y2-y0)/(y2-y1))*(x2-x1); str(c[m]:5:2,s); CutPoint[m] := s; inc(m); end; if i

10 if Cross then begin x1 := (i-2)*10; x2 := (i-1)*10; y1 := CrankTangentialForce[i-1]; y2 := CrankTangentialForce[i]; y0 := AverageTangentialForce; c[m] := x2 - ((y2-y0)/(y2-y1))*(x2-x1); str(c[m]:5:2,s); CutPoint[m] := s; inc(m); end; cutnumber := 0; for i := 1 to 5 do if c[i]>0 then begin cb[i] := Int(c[i]/10); inc(cutnumber); end; ExcessEnergy := Integrals(CrankTangentialForce,AverageTangentialForce,c,cb,j,cutnumber); end; The cutting angles of the average tangential force and the varying tangential force are calculated (continued) Each partial tangengial force and their starting and ending angles are transferred to the procedure INTEGRALS, which calculates each integral, compares them and returns the highest value

11 function Integrals(CTF:Forces;AVTF:real;c,cb:carray;numberofpoints,numberofcuts:integer):real; var ri :real; i,j,k,np,np1,np2 : integer; Integral : carray; Sum,LastTri : real; begin c[numberofcuts+1] := numberofpoints*10; cb[numberofcuts+1] := numberofpoints; np := numberofpoints; np2 := np-2; np1 := np-1; for i := 1 to numberofpoints+1 do CTF[i] := CTF[i]-AVTF; i := 1; ri := cb[i]; j := Trunc(ri); if j=0 then begin k := 1; Integral[k] := Abs(CTF[k]*c[k]/2); i := 2;

12 repeat inc(k); Integral[k] := Abs(CTF[i]*((i-1)*10-c[k-1])/2); Sum := CTF[i]; repeat inc(i); Sum := Sum + 2*CTF[i]; until i>=cb[k]; inc(i); Sum := Sum + CTF[i]; LastTri := CTF[i]*(c[k]-(i-1)*10)/2; Sum := Sum*5 + LastTri; Integral[k] := Integral[k] + Abs(Sum); inc(i); until k=numberofcuts+1; end;

13 if ((j>0) and (j1 then Integral[k] := Abs(CTF[i]*((i-1)*10-c[k-1])/2) else Integral[k] := 0; Sum := CTF[i]; repeat inc(i); Sum := Sum + 2*CTF[i]; until i>=cb[k]; inc(i); Sum := Sum + CTF[i]; LastTri := CTF[i]*(c[k]-(i-1)*10)/2; Sum := Sum*5 + LastTri; Integral[k] := Integral[k] + Abs(Sum); inc(i); until k=numberofcuts+1; end;

14 if j=np1 then begin end; Sum := 0; for i := 1 to numberofcuts+1 do if Integral[i]>Sum then Sum :=Integral[i]; Integrals := Sum; end;

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