Реферат: Отчет по лабораторной работе Моделирование гидравлической системы в нестационарном режиме.

Const m As Byte = 2 ' Количество решаемых ОДУ

Const np% = 10, nk% = 7, nv% = 7, g! = 9.8

Public del! ' шаг

Private k!

Private y0!(m), x0! ' Начальное значение

Private n% ' Число шагов

Private kv% ' Кратность вывода

Private x1!, y1!(m), i%

Private ki!, ki1!, ki2!, vm!(nk), v!(nk), ak!(nk), p!(np)

Private hg!(m), h!(m), s!(m), pr!(m), ro!, pn!, x!, ipr%, ipr1%

Sub dydx(x As Single, y() As Single, pr!())

' расчет производных для текущих(pr) x,y

Dim j%

For j = 1 To m: h(j) = y(j): Next j

p(9) = pn * hg(1) / (hg(1) - h(1)): p(10) = pn * hg(2) / (hg(2) - h(2))

p(7) = p(9) + ro * g * h(1) * 0.000001: p(8) = p(10) + ro * g * h(2) * 0.000001

v(1) = ak(1) * Sgn(p(1) - p(7)) * Sqr(Abs(p(1) - p(7)))

v(2) = ak(2) * Sgn(p(2) - p(8)) * Sqr(Abs(p(2) - p(8)))

v(3) = ak(3) * Sgn(p(7) - p(3)) * Sqr(Abs(p(7) - p(3)))

v(4) = ak(4) * Sgn(p(8) - p(4)) * Sqr(Abs(p(8) - p(4)))

v(5) = ak(5) * Sgn(p(8) - p(5)) * Sqr(Abs(p(8) - p(5)))

v(6) = ak(6) * Sgn(p(8) - p(6)) * Sqr(Abs(p(8) - p(6)))

v(7) = ak(7) * Sgn(p(8) - p(7)) * Sqr(Abs(p(8) - p(7)))

pr(1) = (v(1) - v(3) + v(7)) / s(1): pr(2) = (-v(4) - v(5) - v(6) + v(2) - v(7)) / s(2)

For j = 1 To nk: vm(j) = v(j) * ro: Next j

With Worksheets("TMP")

' TMP out

'.Cells(ipr, 1) = i: .Cells(ipr, 2) = "p(5-7)": .Cells(ipr, 6) = "vm"

'.Cells(ipr, 3) = p(5): .Cells(ipr, 4) = p(6): .Cells(ipr, 5) = p(7)