Analysis is one of the most fruitful requirements in computer-aided design
(CAD) after preparation or in the process of CAD modeling. Analysis can be
dened as extracting and manipulation of the needed data from a CAD model.
Designers need to analyze the model to ensure the conformance of the product
to required standards and needs. It is discussed in the previous chapter that a
CAD model comprises various features. Features might provide the direct shape
of the component. Sometimes, even a material removal feature does not provide
the component shape directly. In those cases, the CAD models are made in steps,
and the nal shape is generated through a sequence of features in order. Thus,
dimensional checking of the model in every stage of the sequence becomes man-
datory to ensure the nal produced shape being generated in the CAD model.
Sometimes, there must be limitations on the components or product that derives
the model shape. In those cases, the limitations need to be measured and con-
trolled. Mass properties like total weight, center of gravity, and so forth are some
of the major limitations one may have in his/her product.
Dimensions are one of the major criteria that a user needs to know at vari-
ous stages of preparation of a CAD model. CAD provides tools to measure the
dimensions between various entities in a CAD model. A distance between two
noncoplanar and nonintersecting lines is easily measured in CAD, whereas the
same can drive out in-hand calculations with much consumed time and effort.
CAD models are often analyzed for strength and dimension criteria to
ensure and verify the model in the required service condition. A manual
calculation for the strength and stress values of a component may be too
large and time consuming. Finite element analysis (FEA) provides an excel-
lent solution in this type of situation, which enables engineers to validate the
model with comparatively higher accuracy and in lesser time.
Kinetic analyses are among the major required analysis elds in CAD. The
various positions of any point of any part in a mechanism can be traced with
respect to variation of location of other parts. Advanced CAD software pro-
vides tools for simulation of mechanisms. Simulation includes the visualiza-
tion of mechanisms in the running condition; thus, various positions of the