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Article
Publication date: 17 May 2011

Matthew J. Traum

High autogyro accident rates prompted experimental investigation of this type of aircraft's low‐speed pitch characteristics. Pitch control is typically derived from main rotor…

546

Abstract

Purpose

High autogyro accident rates prompted experimental investigation of this type of aircraft's low‐speed pitch characteristics. Pitch control is typically derived from main rotor tip‐path‐plane adjustment. Thus, autogyro designers often omit horizontal tails and pitch control surfaces. The purpose of this paper is to enable autogyro low‐speed pitch control by intentionally placing elevators in the propeller wake.

Design/methodology/approach

Wind tunnel tests were conducted on a 1:10 scale teetering rotor autogyro model. The model included a horizontal tail with elevators placed in the propeller wake. Straight‐and‐level flight conditions were estimated via a scaling scheme based on the main rotor diameter. At minimum flight speed, the pitching moment induced by 30° elevator deflection was measured. This process was repeated for a range of elevator positions behind the centre of the pitching rotation.

Findings

When placed in an autogyro propeller wake, deflected elevators induce significant pitching moments. If the elevator is shadowed from free stream flow by the autogyro cowling, the pitching moment remains unchanged regardless of the distance between elevators and centre of pitch rotation. However, if the elevator is immersed in the freestream, the pitching moment increases via deflection of both propeller wake and freestream flow.

Research limitations/implications

Kinematic similarity ensures ratios between propeller wake, wind speed, and main rotor flows are representative of full scale. Without flow visualization, main‐rotor‐diameter‐based scaling does not ensure kinematic similarity. Results are therefore qualitative.

Practical implications

Elevators mounted in autogyro propeller wake are worthy of inclusion on all autogyros for pitch control at low speed.

Originality/value

Improved low‐speed pitch control arising from elevators mounted in autogyro propeller wake could potentially reduce accidents.

Details

Aircraft Engineering and Aerospace Technology, vol. 83 no. 3
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 14 December 2015

Laura J. Elwyn, Nina Esaki and Carolyn A. Smith

Serious juvenile delinquency is a significant and costly problem in the society. However, custodial environments often exacerbate current problems and promote recidivism. Girls’…

501

Abstract

Purpose

Serious juvenile delinquency is a significant and costly problem in the society. However, custodial environments often exacerbate current problems and promote recidivism. Girls’ delinquency, in particular, may call for trauma-informed approaches within organizations that serve the most serious offenders. The purpose of this paper is to explore whether implementation of a trauma-informed intervention that aims to change the therapeutic stand of the organization, the Sanctuary Model®, corresponded with improved indicators of physical and psychological safety of staff and youth at a female secure juvenile justice facility.

Design/methodology/approach

This study utilizes quantitative administrative and performance-based standards (PbS) data routinely collected at the facility.

Findings

Findings suggest that the facility was a safer place for both residents and staff after implementation of the model. Its safety indicators also compare favorably to those of the juvenile justice correctional field in general.

Research limitations/implications

This study was constrained by a number of limitations, including lack of some desirable detail on the PbS measures and on a comparable field group of girls’ facilities. It is also hard to assess the impact of other concurrent changes in the facility. Future research that addresses these issues would be useful in further determining the utility of the model.

Originality/value

This study is the first to examine the impact of a structured trauma-informed organizational change intervention based on therapeutic communities principles, namely the Sanctuary Model, on staff and youth in a secure juvenile justice facility. Findings may be of value to practitioners, administrators, policy makers, and researchers in the corrections field.

Details

Therapeutic Communities: The International Journal of Therapeutic Communities, vol. 36 no. 4
Type: Research Article
ISSN: 0964-1866

Keywords

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Article
Publication date: 25 January 2011

Stephen Fox, Patrick Ehlen and Matthew Purver

The purpose of this paper is to inform the development of mixed initiative systems for distributed digital communication of manual skills. In particular, manual skills that are…

1486

Abstract

Purpose

The purpose of this paper is to inform the development of mixed initiative systems for distributed digital communication of manual skills. In particular, manual skills that are essential in project production paradigms such as engineer‐to‐order.

Design/methodology/approach

Findings from survey research, which included literature review and interviews with practitioners, are reported. Literature review investigated media, strategies, and computation relevant to distributed digital communication of manual skills. Interviews investigated attitudes among industry practitioners towards distributed digital communication of manual skills.

Findings

Communication media, instructional strategies, and computational semantics techniques are available which can be integrated to address the limitations of human communication of manual skills.

Research limitations/implications

Only ten organizations were involved in interviews investigating attitudes towards distributed digital communication of manual skills.

Practical implications

Manual skills will continue to be important to project businesses involved in the production, refurbishment, and/or maintenance of large engineer‐to‐order products such as public buildings and process plants. The limitations of human communication can be addressed by using a variety media, such as augmented reality headsets, to enable new instructional strategies, such as just‐in‐time training. Further, combinations of media and strategies can be integrated with computational semantics in the development of mixed initiative systems which provide feedback as well as initial instruction.

Originality/value

The originality of the research reported in this paper is that it addresses a full range of enablers for distributed communication of manual skills. Further, an overview of computational semantics is presented which does not rely on prior specialist knowledge. The value of this paper is that it introduces a framework for enabling distributed communication of manual skills. In addition, a preliminary ontology for distributed communication of manual skills is introduced, together with recommendations for implementation.

Details

International Journal of Managing Projects in Business, vol. 4 no. 1
Type: Research Article
ISSN: 1753-8378

Keywords

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