Download Solid Modeling and Applications: Rapid Prototyping, CAD and by Dugan Um PDF

By Dugan Um

The classes during this primary textual content equip scholars with the idea of desktop Assisted layout (CAD), computing device Assisted Engineering (CAE), the necessities of speedy Prototyping, in addition to functional abilities had to observe this knowing in genuine global layout and production settings. The e-book contains 3 major components: CAD, CAE, and swift Prototyping, each one enriched with quite a few examples and workouts. within the CAD part, Professor Um outlines the fundamental inspiration of geometric modeling, Hermite and Bezier Spline curves thought, and three-dimensional floor theories in addition to rendering concept. The CAE part explores mesh new release thought, matrix suggestion for FEM, the stiffness strategy, and truss Equations. And in swift Prototyping, the writer illustrates stereo lithographic idea and introduces well known smooth RP applied sciences. strong Modeling and functions: quick Prototyping, CAD and CAE conception is perfect for collage scholars in a variety of engineering disciplines in addition to layout engineers considering product layout, research, and validation.

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Extra resources for Solid Modeling and Applications: Rapid Prototyping, CAD and CAE Theory

Example text

2 Coordinate transformation P ¼ B P þ A PBORG : ð3:9Þ s A B t 56 3 3D Geometric Modeling Fig. 3 Translational mapping between coordinate systems The mapping between two vectors from two different coordinate systems can be represented by a translational vector, APBORG, when two coordinates are parallel along the corresponding axes. Let us consider a case where only the rotation took place between two coordinate systems (see Fig. 4). There is no translation between the origins of two systems. ” The answer is to use a rotational matrix introduced in Sect.

The symbol (M) stands for MMC (Maximum Material Condition), which is discussed in Sect. 1. 1 Datum Plane Datum planes or datum lines are used to specify the reference or baseline for specifying tolerances. Once a datum plane is specified, all of the tolerances are specified from the datum plane so that the dimensional changes can be minimized by eliminating the tolerance accumulation. The tolerancing exercise without the use of datum plane is called chain tolerancing. For instance, in Fig. 01 Fig.

In order to represent the above three equations in a simpler and compact form, we use the following expression for convenience. h Ab XB Ab YB Ab ZB i 2 r11 6 ¼ 4 r21 r31 r12 r13 3 r22 7 r23 5 or r32 r33 h Ab Ab Ab XB YB ZB i ¼ AB R ð3:3Þ We define the symbol AB R as a rotational matrix between the system {A} and {B}. 3) becomes the following equation. 1 Prove the following relationship. 4), BA R has to be configured as below. 2 bB bA Á X X 6b b B AR ¼ 4 XA Á YB bB bA Á Z X bB bA Á X Y bB bA Á Y Y 3 bB bA Á X Z bB 7 bA Á Y 5 Z bB bA Á Z Y bB bA Á Z Z ð3:5Þ Now, if we take transpose on the matrix above, we will obtain; 2 bB bA Á X X 6b b B T AR ¼ 4 YA Á XB bB bA Á X Z bB bA Á Y X bB bA Á Y Y 3 bB bA Á Z X bB 7 bA Á Z 5 Y bB bA Á Y Z bB bA Á Z Z ð3:6Þ Since dot product has the commutative property, the first row can be rewritten as below.

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