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Design Process and Material SelectionDesign Process-StagesConceptual Design

Embodiment Design

Detail DesignNeed StatementThe statement which designates the needPrecisely is called a need statement.

For exampleA device is need to perform the X operation Technical System or Product

Technical system(cat)

DesignA design is one which converts

Input Output

For example:Motor

Burglar alarm6ContThus in this approach we see the components or the subsystems performing some function and sub-function. This is called the functional structure.

So how do we see a cat now?

Conceptual DesignConceptual design is the process by which thedesign is initiated, a lot of concepts are analyzedand the final applicable concept is found.

There are a lot of steps:Customer need identificationProblem definitionGathering informationConceptualizationConcept selectionPDS and design reviewEmbodiment designIt is the phase where the structure and development of the concept takes place.Strength, material selection, size, shape and spatial compatibility are decided.Three major tasks:Product architectureConfiguration design of parts and componentsParametric design of parts and componentsDetail DesignThe design is brought to the engineering description of a tested and producible product.The perfect materials and the suppliers are also chosen.All properties not analyzed and reported in the last phase are analyzed and reported.Assembly drawings and assembly instructions are prepared.The design is completely ready for manufacturing.

Types of designOriginal designEg. Compact disk, high purity silicon transistor, AircraftsAdaptive designEg. Sport goods replacement materialsVariant designEg. Scaling up of boilersDesign tool

Shape, material and process

Give example about wine bottles.Need statement A device needed to pull corks from a wine bottle.OrA device is needed to allow access to the wine in a cork bottle with convenience, at modest cost and without contaminating the wine.Opening cork and pouring out the wine

Forms of opening a cork

Working principles

The working principles require

Material Selection Charts

Displaying material properties

Construction of a chartObjective:To construct a material selection chartwhich features the young modulus anddensity of the Materials.

What are the classes of engineeringmaterials you know?Classes of materialsEngineering ceramicsEngineering metals and alloysEngineering polymersPorous ceramicsEngineering compositesGlassesWoodsElastomers Polymer foams

Propagation of sound

Density depends on:Atomic weightPacking in the latticeSizeModuli depends on:Bond stiffnessDensity of bonds per unit areaThank You