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Article
Publication date: 1 September 2004

Hao‐Chih Liu, Sunyoup Lee, Sangkyun Kang, Christopher F. Edwards and Fritz B. Prinz

A rapid prototyping process applying ceramic gelcasting and assembly mould shape deposition manufacturing has been developed to fabricate mesoscale silicon nitride components with…

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Abstract

A rapid prototyping process applying ceramic gelcasting and assembly mould shape deposition manufacturing has been developed to fabricate mesoscale silicon nitride components with complex 3D geometry. An overview of the fabrication of Si3N4 burner arrays for gas turbine reheat applications is demonstrated. The design of burner arrays features internal fuel passages and integrated fuel injection elements, which cannot be manufactured by conventional methods. Geometrical decomposition of design models and recent developments in ceramic processing provide a novel approach in prototyping the burner arrays. In this paper, issues of materials compatibility, mould fabrication strategies, ceramic processing, and design iterations will be discussed along with the functional test of the 4×4 burner array.

Details

Rapid Prototyping Journal, vol. 10 no. 4
Type: Research Article
ISSN: 1355-2546

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Book part
Publication date: 4 August 2014

Nik Alia Wan Ab Rahman, Sangkyun Kim and Steve Brown

This chapter aims to develop a holistic conceptual understanding of how tourism experiences are constructed, contextualized and packaged in the context of travel blogs. Tourist…

Abstract

This chapter aims to develop a holistic conceptual understanding of how tourism experiences are constructed, contextualized and packaged in the context of travel blogs. Tourist experiences are highlighted as an on-going process, continuously changing and altering during pre-, on-site-, and post-visit of tourist experiences. This chapter also examines the relationships between travel blog users’ motivation and engagement and tourist experience construction. As a result, a new dimension to the previous tourist experiences is offered.

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Tourists’ Perceptions and Assessments
Type: Book
ISBN: 978-1-78350-618-7

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Article
Publication date: 1 October 2006

Evan Malone and Hod Lipson

To seek to produce low‐voltage, soft mechanical actuators entirely via freeform fabrication as part of a larger effort to freeform fabricate complete electromechanical devices…

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Abstract

Purpose

To seek to produce low‐voltage, soft mechanical actuators entirely via freeform fabrication as part of a larger effort to freeform fabricate complete electromechanical devices with lifelike and/or biocompatible geometry and function.

Design/methodology/approach

The authors selected ionomeric polymer‐metal composite (IPMC) actuators from the literature and the authors' own preliminary experiments as most promising for freeform fabrication. The authors performed material formulation and manual device fabrication experiments to arrive at materials which are amenable to robotic deposition and developed an SFF process which allows the production of complete IPMC actuators and their fabrication substrate integrated within other freeform fabricated devices. The authors freeform fabricated simple IPMC's, explored some materials/performance interactions, and preliminarily characterized these devices in comparison to devices produced by non‐SFF methods.

Findings

Freeform fabricated IPMC actuators operate continuously in air for more than 4 h and 3,000 bidirectional actuation cycles. The output stress scaled to input power is one to two orders of magnitude inferior to that of non‐SFF devices. Much of this difference may be associated with process‐sensitive microstructure of materials. Future work will investigate this performance gap.

Research limitations/implications

Device performance is sufficient to continue exploration of SFF of complete electromechanical devices, but will need improvement for broader application. The feasibility of the approach for producing devices with complex, non‐planar geometry has not been demonstrated.

Practical implications

This work demonstrates the feasibility of freeform fabricating IPMC devices, and lays groundwork for further development of the materials and methods.

Originality/value

This work constitutes the first demonstration of complete, functional, IPMC actuators produced entirely by freeform fabrication.

Details

Rapid Prototyping Journal, vol. 12 no. 5
Type: Research Article
ISSN: 1355-2546

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