曲線計算配套驗算軟件開發(fā)的一種思路

郭有寶

(包頭鐵道職業(yè)技術學院鐵道工程系，內蒙古 包頭 014060)

曲線計算配套驗算軟件開發(fā)的一種思路

郭有寶

(包頭鐵道職業(yè)技術學院鐵道工程系，內蒙古 包頭 014060)

道路中邊樁坐標計算比較復雜，因此在教學實踐過程中有諸多不便。本程序拋棄了復雜的坐標平移轉換公式，利用普通函數計算器計算模式和簡單便捷的VB語言，在日常教學運用過程中，便于學生理解和掌握。

曲線計算；軟件開發(fā)；驗算

1 圓曲線編程方法

(1)計算圓曲線曲線要素代碼如下：

dblT = dblR * Tan(dblA / 2)

dblL = dblR * dblA

dblE = dblR * (1 / Cos(dblA) - 1)

dblD = 2 * dblT - dblL

(2)計算圓曲線主點里程，代碼如下：

dblZY = dblJD - dblT

dblYZ = dblZY + dblL

dblQZ = dblYZ - dblL / 2

(3)計算圓曲線主點坐標，代碼如下：

ZYX = JDX + dblT * Cos(aAB + PI)

ZYY = JDY + dblT * Sin(aAB + PI)

YZX = JDX + dblT * Cos(aDC)

YZY = JDY + dblT * Sin(aDC)

在計算中要考慮左偏還是右偏

If txtA.Text > 0 Then ′曲線右偏

QZX = JDX + dblE * Cos(aAB + PI / 2 + dblA / 2)

QZY = JDY + dblE * Sin(aAB + PI / 2 + dblA / 2)

Else ′左偏

QZX = JDX + dblE * Cos(aAB - PI / 2 - dblA / 2)

QZY = JDY + dblE * Sin(aAB - PI / 2 - dblA / 2)

End If

(4)計算指定樁里程的坐標，代碼如下：

If AK < dblZY Then ′判斷A點里程在起點到直圓點之間

AX = ZYX + (dblZY - AK) * Cos(aAB + PI)

AY = ZYY + (dblZY - AK) * Sin(aAB + PI)

ElseIf AK > dblZY And AK < dblYZ Then ′判斷A點里程在圓曲線上

If txtA.Text > 0 Then

RX = JDX + (dblE + dblR) * Cos(aAB + PI / 2 + dblA / 2)

RY = JDY + (dblE + dblR) * Sin(aAB + PI / 2 + dblA / 2)

YJJ = (AK - dblQZ) / dblR

AX = RX + dblR * Cos(aAB - PI / 2 + dblA / 2 + YJJ)

AY = RY + dblR * Sin(aAB - PI / 2 + dblA / 2 + YJJ)

Else

RX = JDX + (dblE + dblR) * Cos(aAB - PI / 2 - dblA / 2)

RY = JDY + (dblE + dblR) * Sin(aAB - PI / 2 - dblA / 2)

YJJ = (AK - dblQZ) / dblR

AX = RX + dblR * Cos(aAB + PI / 2 - dblA / 2 - YJJ)

AY = RY + dblR * Sin(aAB + PI / 2 - dblA / 2 - YJJ)

End If

Else ′判斷A點里程在圓直點到終點之間

AX = YZX + (AK - dblYZ) * Cos(aDC)

AY = YZY + (AK - dblYZ) * Sin(aDC)

End If

計算另一個指定點的路程代碼相近，在此不作介紹。

2 緩和曲線計算核心代碼

計算緩加圓曲線常數并輸出，代碼如下

ls = txtL0.Text

bet0 = ls / (2 * dblR)

txtB = HuToDo(bet0)

p = ls * ls / (24 * dblR)

m = ls / 2 - ls^3/ (240 * dblR * dblR)

計算緩加圓曲線要素并輸出，代碼如下：

Th = (dblR + p) * Tan(dblA / 2) + m

ly = dblR * (dblA - 2 * bet0)

Lh = ly + 2 * ls

Eh = (dblR + p) / Cos(dblA / 2) - dblR

Dh = 2 * Th - Lh

計算緩加圓曲線主點里程，代碼如下：

dblZH = dblJD - Th

dblHY = dblZH + ls

dblYH = dblHY + ly

dblHZ = dblYH + ls

dblQZ = dblHZ - Lh / 2

計算緩加圓曲線主點坐標，代碼如下：

ZYX = JDX + Th * Cos(aAB + PI)

ZYY = JDY + Th * Sin(aAB + PI)

YZX = JDX + Th * Cos(aDC)

YZY = JDY + Th * Sin(aDC)

If txtA.Text > 0 Then

QZX = JDX + Eh * Cos(aAB + PI / 2 + dblA / 2)

QZY = JDY + Eh * Sin(aAB + PI / 2 + dblA / 2)

RX = JDX + (Eh + dblR) * Cos(aAB + PI / 2 + dblA / 2)

RY = JDY + (Eh + dblR) * Sin(aAB + PI / 2 + dblA / 2)

YJJ = ly / (2 * dblR)

YHX = RX + dblR * Cos(aAB - PI / 2 + dblA / 2 + YJJ)

YHY = RY + dblR * Sin(aAB - PI / 2 + dblA / 2 + YJJ)

HYX = RX + dblR * Cos(aAB - PI / 2 + dblA / 2 - YJJ)

HYY = RY + dblR * Sin(aAB - PI / 2 + dblA / 2 - YJJ)

Else

QZX = JDX + Eh * Cos(aAB - PI / 2 - dblA / 2)

QZY = JDY + Eh * Sin(aAB - PI / 2 - dblA / 2)

RX = JDX + (Eh + dblR) * Cos(aAB - PI / 2 - dblA / 2)

RY = JDY + (Eh + dblR) * Sin(aAB - PI / 2 - dblA / 2)

YJJ = ly / (2 * dblR)

YHX = RX + dblR * Cos(aAB + PI / 2 - dblA / 2 - YJJ)

YHY = RY + dblR * Sin(aAB + PI / 2 - dblA / 2 - YJJ)

HYX = RX + dblR * Cos(aAB + PI / 2 - dblA / 2 + YJJ)

HYY = RY + dblR * Sin(aAB + PI / 2 - dblA / 2 + YJJ)

End If

計算緩加圓曲線指定中樁坐標，代碼如下：

If AK < dblZH Then ′判斷A點里程在起點到直緩點之間

AX = ZHX + (dblZH - AK) * Cos(aAB + PI)

AY = ZHY + (dblZH - AK) * Sin(aAB + PI)

ElseIf AK > dblZH And AK < dblHY Then ′判斷A點里程在第一緩和曲線上

If txtA.Text > 0 Then

L = (AK - dblZH) - (AK - dblZH) ^ 5 / (90 * dblR * dblR * ls * ls)

A = (AK - dblZH) * (AK - dblZH) / (6 * dblR * ls)

AX = ZHX + L * Cos(aAB + A)

AY = ZHY + L * Sin(aAB + A)

Else

L = (AK - dblZH) - (AK - dblZH) ^ 5 / (90 * dblR * dblR * ls * ls)

A = (AK - dblZH) * (AK - dblZH) / (6 * dblR * ls)

AX = ZHX + L * Cos(aAB - A)

AY = ZHY + L * Sin(aAB - A)

End If

ElseIf AK > dblHY And AK < dblYH Then ′判斷A點里程在圓曲線上

If txtA.Text > 0 Then

RX = JDX + (Eh + dblR) * Cos(aAB + PI / 2 + dblA / 2)

RY = JDY + (Eh + dblR) * Sin(aAB + PI / 2 + dblA / 2)

YJ = (AK - dblQZ) / dblR

AX = RX + dblR * Cos(aAB - PI / 2 + dblA / 2 + YJ)

AY = RY + dblR * Sin(aAB - PI / 2 + dblA / 2 + YJ)

Else

RX = JDX + (Eh + dblR) * Cos(aAB - PI / 2 - dblA / 2)

RY = JDY + (Eh + dblR) * Sin(aAB - PI / 2 - dblA / 2)

YJ = (AK - dblQZ) / dblR

AX = RX + dblR * Cos(aAB + PI / 2 - dblA / 2 - YJ)

AY = RY + dblR * Sin(aAB + PI / 2 - dblA / 2 - YJ)

End If

ElseIf AK > dblYH And AK < dblHZ Then ′判斷A點里程在第二緩和曲線上

If txtA.Text > 0 Then

L = (dblHZ - AK) - (dblHZ - AK) ^ 5 / (90 * dblR * dblR * ls * ls)

A = (dblHZ - AK) * (dblHZ - AK) / (6 * dblR * ls)

AX = HZX + L * Cos(aDC + PI - A)

AY = HZY + L * Sin(aDC + PI - A)

Else

L = (dblHZ - AK) - (dblHZ - AK) ^ 5 / (90 * dblR * dblR * ls * ls)

A = (dblHZ - AK) * (dblHZ - AK) / (6 * dblR * ls)

AX = HZX + L * Cos(aDC + PI + A)

AY = HZY + L * Sin(aDC + PI + A)

End If

Else '判斷A點里程在圓直點到終點之間

AX = HZX + (AK - dblHZ) * Cos(aDC)

AY = HZY + (AK - dblHZ) * Sin(aDC) End If

計算里程B的坐標與計算里程A的坐標相似，在這里不做特殊說明。

[1] 佟彪.VB語言與測量程序設計[M].北京：中國電力出版社.

[2] 王浩.多種緩和曲線線型通用計算模型的編程實現,地下交通工程與工程安全——第五屆中國國際隧道工程研討會文集[Z].國際會議.

[3] 王中偉.卡西歐fx-5800P計算機道路施工放樣程序從入門到精通[M].廣州：華南理工大學出版社.

2016-04-26

郭有寶(1984-)，男，黑龍江人，助教，主要從事測繪工程及高職測量教學工作研究。

U412

C

1008-3383(2017)02-0073-03