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第 4 章 计算机辅助 设计 (2). Ⅳ Computer Aided Design ( CAD ). 4.3.4 数据的公式拟合方法. 在实际工程问题中,时常需要用一定的 数学方法 将一系列 测试数 据 或 统计数据 拟合成近似的 经验公式 ,这种 建立经验公式的过程 也 称为 曲线拟合 ,或称 数据公式化 。. 曲线拟合 ,目前一般采用 最小二乘法拟 合 。 拟合公式的类型 通常可以选取 线性方程 、 代数多项式 或一些 初等 函数 。这一工作由 编程人员 根据 线图 或 实验数据分布形态 来决定。. - PowerPoint PPT Presentation
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4 (2) Computer Aided Design ( CAD )
4.3.4
1. m 4-12
n y(x) 4-124-10 m >> n
D i 4-11
4-124-13
4-13
(n +1) (n +1) y(x) y(x) n (4-10)
4-4 4-c 7 4-c
1234567Xi-3-2-10123Yi4230-1-2-5
m7n2 (4-12)j0j1j2
XiYi
2. (1)
(2)
(3)4-144-154-16 m i12m lg y = lga + b lg x2-172-192-18
(2-19)
v b lg a v a 2-20
4.3.5CAD
(1) (2)CAD
CAD
4-f
4.4
CADCADCAD
4.4.1 CADCAD
1. 4-g 4-b(DBMS)
12 34
2.
dBASE FOXBASE FOXPRO ORACLE
CADCAD(EDBMS)
4.4.2 l. Excel
Excel
AccessFoxProSQL Server
2. Access(1)
(2) wordExcel
(3)
(4) OBDC Access Access Microsoft Office Windows
Access
4.4.3 CAD/CAM(EDBMS)
CAD/CAM
EDBMS
EDBMS
4
(1)
(2) 1.
(3)
(4) --
2. EDBMS
EDBMS
(1) EDBMS
(2)
(4) -EDBMS(3)
3. (EDBMS)
(1)
(2) DBMSDBMSCADEDBMS
(3) CAD DBMS
CAD EDBMS
4.5 CAD
CAD
(1) CAD (2) CAD(3)
4.5.1 (1)
4-h 4-h(a)D1, D2, D3, L1L24-h(b)(a) (b)
4-h
(2)
Auto CADPICAD
4.5.2
1. 4-14 4-14
2.
4-14(c)
3.
0, 01.0,1.04-14(b)
4-154-15(a) (b) (c)
4-14S l S w X nY n X sY s
4.5.3
(x, y) (x, y, z)
1. n1 n
P(x, y) P(kxkyk) k n
[x, y, 1]4-15 P(x, y) [x, y, 1]33 A
P P* A
P* Aabde cf
2.
(1)
Tx x Ty y 4-164-16
(2) S x x S y y S xS y 1 S xS y14-17S xS y2 4-17
(3) 4-18
(4) 4-19 xy o
x
x y
y o
o x y y x xy
(5)
x y 4-20 4-20
(1) x y x SH x (2) y x y SH y
3.
1 T 4-16
2 4-17 3 4-18
4(1)
(2)
(3) T 4-21
4-19
54-22
(1)
(2)
(3) T
64-23 x y C/A C/B x
(1) x C/A(2) x (3) x (4) x (5) x C/A
T
4.5.4 20 60CADCAD
CAD
1. W1reframe Model
4-i 8V1V2V8124-i
4-e(b) (c)
(ei)123456789101112122334415667788515263748
(V)Xyz12345678001101111011000100110010
2. Surface Model4-j
4-j
(b) (c) (d) 4-f (b) (c) (d) 4-f
(V)Xyz12345678001101111011000100110010
(ei)123456789101112122334415667788515263748
(Fi)1234561 2 3 45 6 7 81 10 5 92 11 6 103 12 7 114 9 8 12
(V)Xyz12345678001101111011000100110010
(ei)123456789101112122334415667788515263748
3. Solid Model
CSG B-rep
(1) CSGConstructive Solid Geometry4-244-24
CSG
(2) B-repBoundary Representation Model B-rep
B-rep
4-25B-rep
4-25(a) B-rep
4-25(b)F-L-E-V
B-rep
(3) 4-26
4-26 (a) 4-26 (b) 4-26
4. CAD/CAM
featureCAPPCAD/CAM
4.6
(FortranCBasic)
FoxBase, dBaseFoxPro
AutoCADPICADAutoCAD FoxBasedBaseAuto CADCAD
4.6.1
4-k 4-k
1 2 3
4-l
17 4-l
4.6.2 CADCAD
(1) (2) (3) (4) (5) (6) CAD
4.6 CADCADCADCAD
Pro/EngineerUGI-DEASCATIASolidedge AutoCAD
4.6.1 CAD Autolisp ADS ARX (C++) VBA Delphi JAVA
4.6.2 CAD
Pro/E: (Family Table) (UDF) Pro/Program J-Link Pro/Toolkit
Thank You !