0

Full Content is available to subscribers

Subscribe/Learn More  >

Boundary Control of Fickian Gaseous Diffusion Process in Polymers

[+] Author Affiliations
Santosh Devasia, Vipin Kumar, Ann M. Mescher

University of Washington, Seattle, WA

Paper No. DSCC2016-9649, pp. V002T18A002; 8 pages
doi:10.1115/DSCC2016-9649
From:
  • ASME 2016 Dynamic Systems and Control Conference
  • Volume 2: Mechatronics; Mechatronics and Controls in Advanced Manufacturing; Modeling and Control of Automotive Systems and Combustion Engines; Modeling and Validation; Motion and Vibration Control Applications; Multi-Agent and Networked Systems; Path Planning and Motion Control; Robot Manipulators; Sensors and Actuators; Tracking Control Systems; Uncertain Systems and Robustness; Unmanned, Ground and Surface Robotics; Vehicle Dynamic Controls; Vehicle Dynamics and Traffic Control
  • Minneapolis, Minnesota, USA, October 12–14, 2016
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-5070-1
  • Copyright © 2016 by ASME

abstract

This article considers the problem of achieving a desired supersaturated gas concentration profile inside a polymer part by controlling the gas concentration on the part boundaries at elevated pressure. Such controlled gas concentration can be used to achieve a desired cell-structure inside the polymer when foaming the gas inside as the part is rapidly heat-treated. The goal is to achieve the interior gas concentration at the end of the controllable pressurization, i.e., right before the heat treatment. When the gas diffusion dynamics is Fickian, the main contribution of this article is to show that any specified concentration profile can be achieved provided a sufficiently large relatively-flat offset of the concentration profile is acceptable. This is demonstrated by showing that the interior gas concentration is controllable by changing the gas concentration at the boundary, and the use of an offset ensures that the control input (the outside concentration) remains positive. The controllability, in turn, allows the use of standard optimal control to achieve the state transition to the desired interior gas concentration before the heat treatment. A model-based simulation is used to illustrate the proposed approach.

Copyright © 2016 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In