## Parametric Modelling

Parametric is a term used to describe a dimension’s ability to change the shape of model geometry as soon as the dimension value is modified.

Feature-based is a term used to describe the various components of a model. For example, a part can consists of various types of features such as holes, grooves, fillets, and chamfers. A ‘feature’ is the basic unit of a parametric solid model.

Parametric modelling uses the computer to design objects or systems that model component attributes with real world behaviour. Parametric models use feature-based, solid and surface modelling design tools to manipulate the system attributes. One of the most important features of parametric modelling is that attributes that are interlinked automatically change their features. In other words, parametric modelling allows the designer to define entire classes of shapes, not just specific instances. Before the advent of parametrics, editing the shape was not an easy task for designers. For example, to modify a 3D solid, the designer had to change the length, the breadth and the height. However, with parametric modelling, the designer need only alter one parameter; the other two parameters get adjusted automatically. So, parametric models focus on the steps in creating a shape and parameterize them. This benefits product design engineering services providers a lot.

The Parametric Modelling Process

Parametric models are built from a set of mathematical equations. For parametric models to have any legitimacy, they must be based on real project information. It is the modernity of the information examination techniques and the breadth of the hidden undertaking information which decides the viability of a modelling solution.

There are two popular parametric representation models:

Constructive Solid Geometry (CSG)

CSG defines a model in terms of combining basic (primitive) and generated (using extrusion and sweeping operation) solid shapes. It uses Boolean operations to construct a model. CSG is a combination of 3D solid primitves (for example a cylinder, cone, prism, rectangle or sphere) that are then manipulated using simple Boolean operations.

Boundary Representation (BR)

In BR, a solid model is formed by defining the surfaces that form its spatial boundaries (points, edges, etc.) The object is then made by joining these spatial points. Many Finite Element Method (FEM) programs use this method, as it allows the interior meshing of the volume to be more easily controlled.

These are the benefits offered by 3D parametric modelling over traditional 2D drawings:

• Capability to produce flexible designs
• 3D solid models offer a vast range of ways to view the model
• Better product visualization, as you can begin with simple objects with minimal details
• Better integration with downstream applications and reduced engineering cycle time
• Existing design data can be reused to create new designs
• Quick design turnaround, increasing efficiency

Parametric Modelling Tools

There are many software choices available in the market today for parametric modelling. On a broad level, this software can be categorized as:

• Small scale use
• Large scale use
• Industry specific modelling

Of the three, the last category (viz. industry specific parametric software) has gained in popularity.  A few of the leading industry software is:

SolidWorks

Introduced in 1995 as a low-cost competitor to the other parametric modeling software products, SolidWorks was purchased in 1997 by Dassault Systemes. It is primarily used in mechanical design applications and has a strong following in the plastics industry.

CATIA

Dassault Systemes created CATIA in France in the late 1970s. This sophisticated software is widely used in the aeronautic, automotive, and shipbuilding industries.

PTC
Creo Parametric is the standard in 3D CAD software. It provides the broadest range of powerful yet flexible 3D CAD capabilities to accelerate the design of parts and assemblies.

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