Modeling and position-sensorless control of a dual-airgap axial flux permanent magnet machine for flywheel energy storage systems

This paper presents the modeling and position-sensorless vector control of a dual-airgap axial flux permanent magnet (AFPM) machine optimized for use in flywheel energy storage system (FESS) applications. The proposed AFPM machine has two sets of three-phase stator windings but requires only a single power converter to control both the electromagnetic torque and the axial levitation force. The proper controllability of the latter is crucial as it can be utilized to minimize the vertical bearing stress to improve the efficiency of the FESS. The method for controlling both the speed and axial displacement of the machine is discussed. An inherent speed sensorless observer is also proposed for speed estimation. The proposed observer eliminates the rotary encoder, which in turn reduces the overall weight and cost of the system while improving its reliability. The effectiveness of the proposed control scheme has been verified by simulations and experiments on a prototype machine.

The knowledge: a project by Boxcopy at Post-Museum, Singapore

‘The Knowledge’ was part of the Next Wave/Asialink project 'Invisible Structures: Australian artist collectives in Tokyo, Singapore and Yogyakarta' in January 2011. For this project, Brisbane ARI Boxcopy undertook a two-week residency at Post Musuem in Singapore. In this project, the Boxcopy artists Channon Goodwin, Joseph Breikers, Timothy P Kerr, Daniel McKewen, Raymonde Rajkowski, Tim Woodward, attempted to acquire an intimate knowledge of the city of Singapore by forming a free delivery company, The Boxcopy Publics Carriage Office of Singapore (BPCOS), which provided services around the city by foot, bike and public transport. In addition to committing to memory and documenting the streets and sites of Singapore, the BPCOS team also performed tasks such as delivering goods or messages, travel a particular route or visit a site, as requested by the people of Singapore. The project comprised this process of public interaction as well as an exhibition and website.

There and back again: Is there a need for GLAM education? (GLAM = Galleries, Libraries, Archives and Museums)

Conferences addressing emerging commonalities in the information professions were being held as far back as the early 1980s. At that time, there appeared to be two differing thoughts on the future of the information professions: one that saw the increasing diversification, the other favouring the professions’ convergence. Nearly thirty-five years later, we are still discussing the various advantages and disadvantages that a convergence of the information professions and professionals may bring; yet there has been very little empirical evidence gathered to enable us to move forward in this discussion. This conceptual paper uses existing literature to argue that the convergence of galleries, libraries, archives and museums is not a new concept to these institutions, but that they have been linked – philosophically and intellectually at least - for millennia. The intention of this paper is not to articulate what should be included in a GLAM curriculum, or to identify the skills and knowledge required of an information professional in a converged environment, but rather to demonstrate that this research is needed in order to provide an evidence base from which these may be developed.

Crossing lines: Sport history, transformative narratives, and Aboriginal Australia

In this collaborative article, we seek to unsettle the dominance of Western, reconstructionist accounts of Indigenous Australian sport history through reflections on our past research in the Queensland Aboriginal community of Cherbourg. That research focussed on a statue of legendary 1930s cricketer, Eddie Gilbert, and on sport exhibitions in Cherbourg's Ration Shed Museum. Here, we are less concerned with unveiling the ‘true’ account of Australian Aboriginal sporting history, or even a ‘true’ Indigenous representation of events. Rather, we are interested in analysing various perspectives in order to generate a more inclusive and complete account of Aboriginal sport history and the narrative implications of these for Indigenous and non-Indigenous Australia. Central to this endeavour is the positioning of Indigenous knowledge and understanding at the centre of history-making. The article is in two sections: reflections on our past work from the perspectives of the researchers themselves and an Aboriginal academic colleague, followed by a discussion of how those experiences and reflections will inform our pending project on the 1950s and 1960s Cherbourg marching girls teams.

Art museums and the global tourist: Experience centres in experience-scapes

In the experience economy, the role of art museums has evolved so as to cater to global cultural tourists. These institutions were traditionally dedicated to didactic functions, and served cognoscenti with elite cultural tastes that were aligned with the avant-garde’s autonomous stance towards mass culture. In a post-avant-garde era however museums have focused on appealing to a broad clientele that often has little or no knowledge of historical or contemporary art. Many of these tourists want art to provide entertaining and novel experiences, rather than receiving pedagogical ‘training’. In response, art museums are turning into ‘experience venues’ and are being informed by ideas associated with new museology, as well as business approaches like Customer Experience Management. This has led to the provision of populist entertainment modes, such as blockbuster exhibitions, participatory art events, jazz nights, and wine tasting, and reveals that such museums recognize that today’s cultural tourist is part of an increasingly diverse and populous demographic, which shares many languages and value systems. As art museums have shifted attention to global tourists, they have come to play a greater role in gentrification projects and cultural precincts. The art museum now seems ideally suited to tourist-centric environments that offer a variety of immersive sensory experiences and combine museums (often designed by star-architects), international hotels, restaurants, high-end shopping zones, and other leisure forums. These include sites such as Port Maravilha urban waterfront development in Rio de Janiero, the Museum of Old and New Art in Hobart, and the Chateau La Coste winery and hotel complex in Provence. It can be argued that in a global experience economy, art museums have become experience centres in experience-scapes. This paper will examine the nature of the tourist experience in relation to the new art museum, and the latter’s increasingly important role in attracting tourists to urban and regional cultural precincts.

Reinforcing stigma or delivering a fresh start: Bankruptcy and future engagement in the workforce

In Australia, bankruptcy retains a social stigma, as is often seen as a personal failing, and an indication that the individual cannot be trusted to meet their obligations. Official labelling and informal labelling reinforce this stigmatisation of bankruptcy in employment and business contexts. This occurs through legislation and policy that imposes restrictions on participation in some occupations on the grounds of bankruptcy, and imposes obligations on persons to disclose their bankruptcy to their employer. These restrictions and obligations that are varying in length and extent, both within industries and professions and across industries and professions, and appear to lack a coherent policy justification. Further, informal labelling is facilitated by the law providing for a permanent, publicly accessible record of bankruptcy, and failing to restrict the use of bankruptcy information in employment and business decision-making. This stigmatisation of bankruptcy inhibits the fresh start objective of bankruptcy, and is not supported by a strong correlation between bankruptcy and negative personal or other attributes. This article therefore argues that a review is needed to determine the circumstances in which there is a genuine policy justification for employment restrictions, and the appropriate length and scope of such restrictions. Reform of the Bankruptcy Act should also be considered. Possible areas for law reform including reducing the minimum period of bankruptcy; removing the permanency and/or public accessibility of the bankruptcy record; revising the language used in the Bankruptcy Act; and introducing a prohibition or restriction on the ability of employers to use bankruptcy status in employment decision making. Such changes would promote the fresh start objective of Australia’s bankruptcy system, and increase the likelihood that bankruptcy does not unfairly inhibit an individual’s ability to engage as an economic actor in Australian society and thereby improve their financial well-being.

Remember or Revive: Alice Payne and the Gold Coast and Hinterland Historical Society

In this creative practice work, designer Alice Payne examines the history of twentieth century Queensland fashion icon Paula Stafford, and interprets her story into an illustrated narrative and textile print. Paula Stafford was a swimwear designer operating in the Gold Coast, Queensland Australia 1940s to 1980s, and is credited with bringing the bikini to Australia. This project was commissioned by The Fashion Archives as part of their series Remember or Revive, in which the curators partnered designers with museums to reinterpret historical costume for a contemporary fashion audience. To develop the project, Payne visited The Gold Coast and Hinterland Historical Society to view Paula Stafford’s swimwear, resortwear, photographs, newspaper articles, fabric swatches and other artefacts relating to Stafford’s practice. Through examining Stafford’s work and history, Payne developed a series of designs based on the story and the experience of viewing and handling the garments. Research statement Fashion history is often experienced via static museum displays of garments and photographs from the period, and this research examines other means through which the archive and the fashion museum collection may be reinterpreted and made fresh. It does this in two ways: first, the work interprets a story from fashion history for a contemporary audience. Second, the project illuminates the fashion design process by demonstrating how garments from the past may be reinterpreted to inspire contemporary textile prints. The Paula Stafford collection at The Gold Coast and Hinterland Historical Society has a number of garments and photographs on display, however these only show a partial picture of the richness of Stafford’s work and legacy. Undertaking a practice-led methodology, in the course of developing the work, Payne examined the archive in order to interpret Stafford’s contribution to Queensland fashion through photography, narrative, and illustration. The work contributes to research into historical fashion curation and interpretation. The work appeared in Issue 11, March 2014 of the The Fashion Archives, an online publication by fashion curators Nadia Buick and Madeline King. The Fashion Archives has received funding from Arts Queensland, State Library Queensland and Creative Partnerships Australia and has published over 200 articles and projects related to Queensland Style. The Fashion Archives is the first project to examine in depth Queensland fashion history. As Paula Stafford is one of Queensland’s most iconic designers, this project is significant in being the first to examine her legacy through creative practice. The Fashion Archives was established in 2013 and involvement is by invitation from the curators.

Condensed phase combustion travelling waves with sequential exothermic or endothermic reactions

The one-dimensional propagation of a combustion wave through a premixed solid fuel for two-stage kinetics is studied. We re-examine the analysis of a single reaction travelling-wave and extend it to the case of two-stage reactions. We derive an expression for the travelling wave speed in the limit of large activation energy for both reactions. The analysis shows that when both reactions are exothermic, the wave structure is similar to the single reaction case. However, when the second reaction is endothermic, the wave structure can be significantly different from single reaction case. In particular, as might be expected, a travelling wave does not necessarily exist in this case. We establish conditions in the limiting large activation energy limit for the non-existence, and for monotonicity of the temperature profile in the travelling wave.