A Case Study in Component Design

Abstract We present a new methodology for designing a heat exchanger that explicitly considers both static and transient performance characteristics. The proposed approach leverages 1) a highly detailed, albeit static model that captures the complex nonlinear relationship between heat exchanger geometry and heat transfer coefficients, and 2) a reduced-order dynamic model of the heat exchanger that approximates the geometry detailed in the static model. In order to optimize the component design for both static and transient performance metrics, pole locations of the corresponding linearized model are penalized in the cost function of the proposed optimization algorithm in order to move dominant poles further into the left half complex plane. Through a simulated case study for a shell and tube heat exchanger, we demonstrate how the proposed algorithm exploits the trade off between static design metrics, including mass and footprint, and the rate at which heat is removed from the primary fluid.

Download Full-text

Passive Optoelectronics Component Manufacturing: A Case Study

Electronic and Photonic Packaging, Electrical Systems Design and Photonics, and Nanotechnology ◽

10.1115/imece2002-39208 ◽

2002 ◽

Cited By ~ 1

Author(s):

Laurence A. Harvilchuck ◽

Peter Borgesen ◽

Pericles Kondos ◽

Sunil Gopakumar ◽

K. Srihari

Keyword(s):

Communication Systems ◽

Fiber Optic ◽

Process Variations ◽

Materials Selection ◽

Optical Isolator ◽

Component Design ◽

Fiber Optic Communication ◽

Component Manufacturing ◽

Optic Communication

The infrastructure required for fiber optic communication systems to become truly affordable includes a supply of individual components at a price that can only be achieved through full automation of the packaging processes. We illustrate the manufacturing of typical passive photonics components through the case of a polarization dependent optical isolator. Identification of the available options here requires an understanding of the underlying optical principles and functionality, as well as of the influences of process variations and part tolerances on performance. Issues relating to cost, ease of manufacturing and automation are discussed. These include component design and materials selection, as well as questions of intellectual property.

Download Full-text

Case study of micro-component design and industry integration

International Journal of Intercultural Information Management ◽

10.1504/ijiim.2009.025368 ◽

2009 ◽

Vol 1 (3) ◽

pp. 248

Author(s):

Raymond Wu

Keyword(s):

Component Design ◽

Industry Integration

Download Full-text

The Function-Based Design for Sustainability Method

Journal of Mechanical Design ◽

10.1115/1.4035431 ◽

2017 ◽

Vol 139 (4) ◽

Cited By ~ 10

Author(s):

Ryan Arlitt ◽

Douglas L. Van Bossuyt ◽

Rob B. Stone ◽

Irem Y. Tumer

Keyword(s):

Decision Making ◽

Environmental Impact ◽

Environmental Impacts ◽

Comparative Case Study ◽

Design Stage ◽

Sustainable Products ◽

Design For Sustainability ◽

Component Design ◽

Alternative Function

Over the last two decades, consumers have become increasingly aware and desiring of sustainable products. However, little attention has been paid to developing conceptual design methods that explicitly take into account environmental impact. This paper contributes a method of automated function component generation, and guided down-selection and decision-making based upon environmental impact. The environmental impact of functions has been calculated for 17 of the products found in the Design Repository using ReCiPe scoring in SimaPRO. A hierarchical Bayesian approach is used to estimate the potential environmental impacts of specific functions when realized into components. Previously, product environmental impacts were calculated after a product was developed to the component design stage. The method developed in this paper could be used to provide a criticality ranking based on which functional solutions historically have the greatest risk of causing high environmental impact. The method is demonstrated using a simple clock system as an example. A comparative case study of two phone chargers for use in third-world countries demonstrates the decision-making capabilities of this method, and shows that it is possible to compare the environmental impact of alternative function structures during the conceptual stage of design. With the method presented in this paper, it is now possible to make early functional modeling design decisions specifically taking into account historical environmental impact of functionally similar products.

Download Full-text

An industry case study of micro component design and semantic mediation

International Journal of Metadata Semantics and Ontologies ◽

10.1504/ijmso.2007.019441 ◽

2007 ◽

Vol 2 (4) ◽

pp. 223

Author(s):

Raymond Wu

Keyword(s):

Component Design ◽

Semantic Mediation

Download Full-text

Hydrogen Assisted Fracture of 30MnB5 High Strength Steel: A Case Study

Metals ◽

10.3390/met10121613 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1613

Author(s):

Garikoitz Artola ◽

Javier Aldazabal

Keyword(s):

Heat Treatment ◽

High Strength Steel ◽

High Strength ◽

Raw Material ◽

Root Cause ◽

Component Design ◽

Hydrogen Assisted Cracking ◽

Assisted Fracture ◽

Hydrogen Effusion

When steel components fail in service due to the intervention of hydrogen assisted cracking, discussion of the root cause arises. The failure is frequently blamed on component design, working conditions, the manufacturing process, or the raw material. This work studies the influence of quench and tempering and hot-dip galvanizing on the hydrogen embrittlement behavior of a high strength steel. Slow strain rate tensile testing has been employed to assess this influence. Two sets of specimens have been tested, both in air and immersed in synthetic seawater, at three process steps: in the delivery condition of the raw material, after heat treatment and after heat treatment plus hot-dip galvanizing. One of the specimen sets has been tested without further manipulation and the other set has been tested after applying a hydrogen effusion treatment. The outcome, for this case study, is that fracture risk issues only arise due to hydrogen re-embrittlement in wet service.

Download Full-text