Nilmani Pramanik

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Design of a new artifact begins with incomplete knowledge about the final product and the design evolves as it progresses from the conceptual design stage to a more detailed design. In this paper, an effort has been made to give a structural framework, through a set of generic definitions, to product specification, functional representation, artifact(More)
Tolerances impose restrictions on the possible deviations of features from their nominal sizes/shapes. These variations of size/shape could be thought of as deviations of a set of generalized coordinates defined at some convenient point on a feature. Any tolerance specification for a feature imposes some kind of restrictions or constraints on its deviation(More)
Traditionally tolerances for manufactured parts are specified using symbolic schemes as per AMSE or ISO standards. For using these tolerance specifications in computerized tolerance synthesis and analysis, we need information model to represent the tolerances. Tolerance specifications could be modeled as a class with its attributes and methods [ROY01]. All(More)
In this paper, a generic model for the synthesis of tolerances for manufactured parts is presented. The model uses a method of transforming traditional tolerance specifications (as defined in ASME Y14.5M) to a generalized coordinate system (hereinafter referred to as deviation space). Small displacement torsors (SDTs) have been used for representing the(More)
Realistic modeling of cost of manufacturing is essential both for estimating cost of a product and for optimizing alternate manufacturing strategies. Although there are many factors that affect cost of manufacturing, the single most important parameter for estimating the cost of manufacturing is tolerance (deviation from the nominal size). Since tolerance(More)
In this paper, a design synthesis process has been proposed for the evolution of a conceptual design from the product specification and a proactive approach to tolerance synthesis has been proposed in the early stages of design when the product realization process is still evolving. The proposed design synthesis method is a mapping from the functional(More)
The need to study the behavior of complex manufacturing processes with multiple machines, job mix and variable batch sizes to establish production schedules to meet specific demands and to identify bottlenecks in the system, cannot be over emphasized. Unfortunately direct analytical formulations of the behavior of these systems are not feasible. Since(More)
The objective of this report is to identify representations and issues for the generic assembly information model and its use in a proactive tolerance synthesis scheme. It is proposed to use the small displacement torsors (the screw parameters) as a mathematical tool for analyzing the causal relationship between variations in parts' shapes and sizes (due to(More)
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