Top Down Modeling And Bottom Up Assembly Modeling|Geometric Primitives | ENGINEERING STUDY MATERIALS

Top Down Modeling And Bottom Up Assembly Modeling|Geometric Primitives | ENGINEERING STUDY MATERIALS Top-down and bottom-up are both strategies of information processing and knowledge ordering, used in a variety of fields including software, humanistic and scientific theories (see systemics), and management and organization. In practice, they can be seen as a style of thinking, teaching, or leadership. A top-down approach (also known as stepwise design and in some cases used as a synonym of decomposition) is essentially the breaking down of a system to gain insight into its compositional sub-systems in a reverse engineering fashion. In a top-down approach an overview of the system is formulated, specifying, but not detailing, any first-level subsystems. Each subsystem is then refined in yet greater detail, sometimes in many additional subsystem levels, until the entire specification is reduced to base elements. A top-down model is often specified with the assistance of "black boxes", which makes it easier to manipulate. However, black boxes may fail to clarify elementary mechanisms or be detailed enough to realistically validate the model. Top down approach starts with the big picture. It breaks down from there into smaller segments. A bottom-up approach is the piecing together of systems to give rise to more complex systems, thus making the original systems sub-systems of the emergent system. Bottom-up processing is a type of information processing based on incoming data from the environment to form a perception. From a cognitive psychology perspective, information enters the eyes in one direction (sensory input, or the "bottom"), and is then turned into an image by the brain that can be interpreted and recognized as a perception (output that is "built up" from processing to final cognition). In a bottom-up approach the individual base elements of the system are first specified in great detail. These elements are then linked together to form larger subsystems, which then in turn are linked, sometimes in many levels, until a complete top-level system is formed. This strategy often resembles a "seed" model, by which the beginnings are small but eventually grow in complexity and completeness. However, "organic strategies" may result in a tangle of elements and subsystems, developed in isolation and subject to local optimization as opposed to meeting a global purpose. Product design and development During the design and development of new products, designers and engineers rely on both a bottom-up and top-down approach. The bottom-up approach is being utilized when off-the-shelf or existing components are selected and integrated into the product. In a top-down approach, a custom fastener would be designed such that it would fit properly in the receiving components. For perspective, for a product with more restrictive requirements (such as weight, geometry, safety, environment, etc.), such as a space-suit, a more top-down approach is taken and almost everything is custom designed. Computer science Top-down approaches emphasize planning and a complete understanding of the system. It is inherent that no coding can begin until a sufficient level of detail has been reached in the design of at least some part of the system. Tags: top down modelling,top down modeling solidworks,top down model,bottom up and top down approach,bottom up approach nanotechnology,bottom up approach,bottom up and top down approach in nanotechnology,bottom up and top down processing,geometric primitives,3d modeling,geometric modeling,geometric modelling in cad,computer graphics,industrial design,product design,solidworks,autodesk,inventor,solid modeling assembly,assembly modeling in cad,assembly modeltop down modelling,top down modeling solidworks,top down model,bottom up and top down approach,bottom up approach nanotechnology,bottom up approach,bottom up and top down approach in nanotechnology,bottom up and top down processing,geometric primitives,3d modeling,geometric modeling,geometric modelling in cad,computer graphics,industrial design,product design,solidworks,autodesk,inventor,solid modeling assembly,assembly modeling in cad,assembly model #Engineering_Study_Materials