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Article
Publication date: 3 January 2017

Shawn S. Keshmiri, Edward Lan and Richard Hale

The purpose of this paper is to evaluate the accuracy of linear and quasi-steady aerodynamic models of aircraft aerodynamic models when a small unmanned aerial system flies in the…

329

Abstract

Purpose

The purpose of this paper is to evaluate the accuracy of linear and quasi-steady aerodynamic models of aircraft aerodynamic models when a small unmanned aerial system flies in the presence of strong wind and gust at a high angle of attack and a high sideslip angle.

Design/methodology/approach

Compatibility analysis were done to improve the quality of recorded flight test data. A robust method called fuzzy logic modeling is used to set up the aerodynamic models. The reduced frequency is used to represent the unsteadiness of the flow field according to Theodorsen’s theory. The work done by the aerodynamic moments on the motions is used as the criteria of stability.

Findings

In portions of flight, aircraft’s stability and control derivatives were unstable and nonlinear functions of airflow angles and angular rates. The roll angle had an important effect on unsteadiness of directional oscillatory damping derivatives. The pilot-induced oscillation and wing rock possibilities were investigated and dismissed so that the lateral directional oscillatory motion was classified as a nonlinear Dutch roll oscillation. Major modeling enhancements or real-time parameter identification are required for the control of a small unmanned aerial system in off-nominal conditions. The robustness tests of all-weather autopilot systems must be done with consideration of sign change.

Originality/value

Oscillatory damping derivatives were reconstructed using flight test data and the inadequacy of engineering level software in predicting this type of instability observed and demonstrated for a flight in the presence of wind shear and external disturbances.

Details

Aircraft Engineering and Aerospace Technology, vol. 89 no. 1
Type: Research Article
ISSN: 1748-8842

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Article
Publication date: 1 November 1988

Edward Valauskas

“Groupware,” “groupwork,” “workgroup computing,” “computer‐supported cooperative work,” and “distributed processing” are buzzwords that refer to a new way in which personal…

45

Abstract

“Groupware,” “groupwork,” “workgroup computing,” “computer‐supported cooperative work,” and “distributed processing” are buzzwords that refer to a new way in which personal computers are being used in offices. Personal computers hooked together into local area networks (LANs) represent the latest stage in the evolution of automated technology. Of the eleven million personal computers in business, over 950,000 are arranged in some sort of LAN set‐up. The future for this configuration of computers and workstations will grow enormously in the next few years. By 1991, a conservative estimate of 6.7 million computers will be linked together in LANs in the workplace.

Details

Library Workstation and PC Report, vol. 5 no. 11
Type: Research Article
ISSN: 0894-9158

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Article
Publication date: 1 May 1977

The case, briefly reported in the last issue of BFJ, an appeal to a Milk and Dairies Tribunal arising out of a local authority's refusal to grant a licence to a milk distributor…

168

Abstract

The case, briefly reported in the last issue of BFJ, an appeal to a Milk and Dairies Tribunal arising out of a local authority's refusal to grant a licence to a milk distributor because he failed to comply with a requirement that he should provide protective curtains to his milk floats, was a rare and in many ways, an interesting event. The Tribunal in this case was set up under reg. 16(2) (f), Milk (Special Designation) Regulations, 1963, constituted in accordance with Part I, clause 2 (2), Schedule 4 of the Regulations. Part II outlines procedure for such tribunals. The Tribunal is similar to that authorized by S.30, Food and Drugs Act, 1955, which deals with the registration of dairymen, dairy farms and farmers, and the Milk and Dairies (General) Regulations, 1959. Part II, Schedule 2 of the Act provided for reference to a tribunal of appeals against refusal or cancellation of registration by the Ministry, but of producers only. A local authority's power to refuse to register or cancellation contained in Part I, Schedule 2 provided for no such reference and related to instances where “public health is or is likely to be endangered by any act or default” of such a person, who was given the right of appeal against refusal to register, etc., to a magistrates' court. No such limitation exists in respect of the revoking, suspending, refusal to renew a licence under the Milk (Special Designation) Regulations, 1963; an appeal against same lies to the Minister, who must refer the matter to a tribunal, if the person so requests. This occurred in the case under discussion.

Details

British Food Journal, vol. 79 no. 5
Type: Research Article
ISSN: 0007-070X

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Book part
Publication date: 1 June 1994

Carmel Maguire, Edward John Kazlauskas and Anthony D. Weir

Abstract

Details

Information Services for Innovative Organizations
Type: Book
ISBN: 978-0-12465-030-5

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Book part
Publication date: 1 January 2005

Lan Xia and Kent B. Monroe

Abstract

Details

Review of Marketing Research
Type: Book
ISBN: 978-0-85724-723-0

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Article
Publication date: 18 May 2012

Reviews the latest management developments across the globe and pinpoints practical implications from cutting‐edge research and case studies.

569

Abstract

Purpose

Reviews the latest management developments across the globe and pinpoints practical implications from cutting‐edge research and case studies.

Design/methodology/approach

This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context.

Findings

Any new enterprise presented to a doubtful audience might well be greeted initially with words such as: “Does it – or can it – really work?” What the skeptics are seeking is a business model, to be shown how the idea, product or service really does work, how it creates value for the company. Many companies can flourish with one or perhaps two models, but where LAN Airlines is able to score over rivals is in having three.

Practical implications:

Provides strategic insights and practical thinking that have influenced some of the world's leading organizations.

Social implications

Provides strategic insights and practical thinking that can have a broader social impact.

Originality/value

The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy‐to‐digest format.

Details

Strategic Direction, vol. 28 no. 7
Type: Research Article
ISSN: 0258-0543

Keywords

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Article
Publication date: 1 March 1992

Walt Crawford

Once in a while, you should take stock of your personal computing environment. What is on your system? How did it get there? What do you actually use? How did you arrive at your…

63

Abstract

Once in a while, you should take stock of your personal computing environment. What is on your system? How did it get there? What do you actually use? How did you arrive at your hardware configuration, and does it still meet your needs? You may find that you can free up some disk space in the process; at the very least, you'll understand your situation better. The author goes through this exercise both as an example of what it can show and because full disclosure is important for this series of articles. You need to know the background for the advice that appears here. The author discloses his current computing environments, how they got that way, and what that may mean. He also points out the real limits within which he operates as a PC commentator. When you go through the software on your system, you should check to see whether it represents ethical computing. The author offers a few notes on ethical issues related to software. The author also provides notes from PC literature for January‐June 1992.

Details

Library Hi Tech, vol. 10 no. 3
Type: Research Article
ISSN: 0737-8831

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Book part
Publication date: 1 February 2007

Dwight R. Merunka and Robert A. Peterson

Abstract

Details

Review of Marketing Research
Type: Book
ISBN: 978-0-7656-1306-6

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Article
Publication date: 1 June 1988

Edward J. Valauskas

In many ways, the use of project management software makes a computer resemble James Martin's idea of a comprehensive machine, a device “that enables management or their staff to…

85

Abstract

In many ways, the use of project management software makes a computer resemble James Martin's idea of a comprehensive machine, a device “that enables management or their staff to understand better the possible effects of their decisions.”

Details

OCLC Micro, vol. 4 no. 6
Type: Research Article
ISSN: 8756-5196

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Article
Publication date: 1 April 1991

A number of developments and activities in the British Library arereviewed. Developments in the field of copyright are outlined and thedevelopment of internal networking is…

59

Abstract

A number of developments and activities in the British Library are reviewed. Developments in the field of copyright are outlined and the development of internal networking is described in some detail. A number of recent exhibitions in the Library are briefly reviewed and significant additions to the collections are described.

Details

Library Review, vol. 40 no. 4
Type: Research Article
ISSN: 0024-2535

Keywords

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