An Economic Design Change Method

2003 ◽  
Vol 125 (2) ◽  
pp. 233-239 ◽  
Author(s):  
Christoph Roser ◽  
David Kazmer ◽  
James Rinderle
Keyword(s):  
Engineering Design ◽  
New Product ◽  
Economic Benefits ◽  
Product Performance ◽  
Engineering Change ◽  
Design Change ◽  
Design Changes ◽  
Design Alternatives ◽  
Potential Impact ◽  
Design Defects

New product design as well as design revision to remedy defects is complicated by an inability to precisely predict product performance. Designers often find that they are confident about the performance of some design alternatives and uncertain about others. Similarly, alternative design changes may differ substantially in uncertainty, potential impact, and cost. This paper describes a method for including the effects of uncertainty in the evaluation of economic benefits of various design change options. The results indicate that the most profitable change option sequence depends not only on relative costs but also on the relative degree of uncertainty and on the magnitude of the potential design defects. The method demonstrates how design change alternatives can be compared using the engineering design of a beam. Finally, the validity of some common engineering change heuristics are discussed relative to their associated, quantitatively determined limits.

A Method to Specify Part of a System to Change in Improvement Design

2020 ◽  
Author(s):  
Kazuya Oizumi ◽  
Kazuhiro Aoyama
Keyword(s):  
Early Phase ◽  
New Product ◽  
Planning Method ◽  
House Of Quality ◽  
Trade Off ◽  
Design Change ◽  
Improve Product ◽  
Design Changes ◽  
Design Planning

Abstract Improvement design, which is characterized by minimum necessary changes to a past product, is employed to reuse verified and experienced parts to create a new product faster, reliable, and economically sound. However, as products become so complex that changes to some parts propagates concomitant changes to other parts, which makes it difficult to enjoy the advantages of improvement design. Therefore, design changes have to be contemplated at the early phase of design. This paper proposes an improvement design planning method based on House of quality. Parts of a product to be changed and directions on which they are changed are explored in terms of opportunity to improve product and risk of worsening other parts. By exploring the possible design in the trade-off between the opportunity and the risk, design change plan that comprises proper parts of a product to be changed can be decided. A case study on a solar boat design demonstrates the applicability and validity of the proposed method.

scholarly journals Continuity, Change, and New Product Performance: The Role of Stream Concentration *

2020 ◽  
Vol 37 (3) ◽  
pp. 228-248 ◽  
Author(s):  
Enrico Forti ◽  
Maurizio Sobrero ◽  
Andrea Vezzulli
Keyword(s):  
New Product ◽  
Product Performance ◽  
New Product Performance

Predictabilty of Change in Engineering: A Complexity View

2005 ◽  
Author(s):  
Claudia Eckert ◽  
John Clarkson ◽  
Chris Earl
Keyword(s):  
Empirical Studies ◽  
Change Propagation ◽  
Design Change ◽  
Design Changes ◽  
Action Model ◽  
Static Background

Design changes can be surprisingly complex. We examine the problems they cause and discuss the problems involved in predicting how changes propagate, based on empirical studies. To assist this analysis we distinguish between (a) a static background of connectivities (b) descriptions of designs, processes, resources and requirements and (c) the dynamics of design tasks acting on descriptions. The background might consist of existing designs and subsystems, or established processes used to create them. The predictability of design change is examined in terms of this model, especially the types and scope of uncertainties and where complexities arise. An industrial example of change propagation is presented in terms of the background (connectivity) - description - action model.

scholarly journals Using Pade´ Approximants and Curve-fitting to Approximate Eigenvalues and Eigenvectors for Large Design Changes

1996 ◽  
Vol 118 (1) ◽  
pp. 151-153 ◽  
Author(s):  
J. M. Vance ◽  
J. E. Bernard
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Solution Process ◽  
Mode Shapes ◽  
Eigenvalues And Eigenvectors ◽  
Computational Burden ◽  
Design Change ◽  
Design Changes ◽  
Develop Software ◽  
Unique Method

Our overall goal is to develop software that facilitates the interactive participation of the designer in the optimization process. We are focusing this research on problems which use finite element solutions as part of the objective function. One challenge to implementing interactive participation in these types of problems is the high computational burden of computing a finite element solution for each design change. The research presented here focuses on a unique method to develop fast approximations for natural frequencies and mode shapes which can be used to avoid the time-consuming re-solution process and which will facilitate interactive design for systems with even large design changes.

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