Mariusz Oszust, Tomasz Kapuscinski, Dawid Warchol, Marian Wysocki, Tomasz Rogalski, Jacek Pieniazek, Grzegorz Henryk Kopecki, Piotr Ciecinski and Pawel Rzucidlo
This paper aims to present a vision-based method for determination of the position of a fixed-wing aircraft that is approaching a runway.
Abstract
Purpose
This paper aims to present a vision-based method for determination of the position of a fixed-wing aircraft that is approaching a runway.
Design methodology/approach
The method determines the location of an aircraft based on positions of precision approach path indicator lights and approach light system with sequenced flashing lights in the image captured by an on-board camera.
Findings
As the relation of the lighting systems to the touchdown area on the considered runway is known in advance, the detected lights, seen as glowing lines or highlighted areas, in the image can be mapped onto the real-world coordinates and then used to estimate the position of the aircraft. Furthermore, the colours of lights are detected and can be used as auxiliary information.
Practical implications
The presented method can be considered as a potential source of flight data for autonomous approach and for augmentation of manual approach.
Originality/value
In this paper, a feasibility study of this concept is presented and primarily validated.
Details
Keywords
Afshin Jalali Sohi, Marian Bosch-Rekveldt and Marcel Hertogh
The purpose of this paper is to study the effect of project management flexibility in early project phases on end-project performance including its mediating role on the effect of…
Abstract
Purpose
The purpose of this paper is to study the effect of project management flexibility in early project phases on end-project performance including its mediating role on the effect of complexity over project performance.
Design/methodology/approach
Out of 13 hypotheses, 6 hypotheses regarding the relationships between areas of flexibility and project performance, 1 regarding the effect of complexity on performance and 6 other hypotheses regarding the mediating effect of six areas of flexibility were formulated. Statistical analysis was performed using partial least squares–structural equation modeling on data gathered from 111 surveys.
Findings
Research results revealed that flexibility of “how-attitude” and “how-organization” has positive significant effects on project performance. “How-attitude” contributes to the flexibility of project management processes by having an “open attitude,” “wide approach” and “proactive attitude” while “how-organization” put the emphasis of flexibility on “facilitate planning,” “outer organization” and “inner organization.” Moreover, this research confirmed that complexity has a negative effect on project performance. Among the six areas of flexibility, flexibility of “how-organization” mediates the effect of complexity on project performance.
Originality/value
The increased project complexity requires some degree of flexibility in project management to deal with project dynamics. However, whether such flexibility in early project phases has an effect on end-project performance has not been empirically investigated. This research contributes to filling the gap in literature about the relationship between project management flexibility and project performance. Such effect was investigated by studying the direct effect of flexibility on project performance and the mediating role of flexibility on the negative effect of project complexity on project performance.
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Keywords
Mustafa Kuntoğlu, Emin Salur, Munish Kumar Gupta, Saad Waqar, Natalia Szczotkarz, Govind Vashishtha, Mehmet Erdi Korkmaz, Grzegorz M. Krolczyk, Abdullah Aslan and Rüstem Binali
Additive manufacturing became the most popular method as it enables the production of light-weight and high-density parts in effective way. Selective laser melting (SLM) is…
Abstract
Purpose
Additive manufacturing became the most popular method as it enables the production of light-weight and high-density parts in effective way. Selective laser melting (SLM) is preferred by means of producing a component with good surface quality and near-net shape even if it has complex form. Titanium alloys have been extensively used in engineering covering a variety of sectors such as aeronautical, chemical, automotive and defense industry with its unique material properties. Therefore, the purpose of this review is to study the tribological behavior and surface integrity that reflects the thermal and mechanical performances of the fabricated parts.
Design/methodology/approach
This paper is focused on the tribological and surface integrity aspects of SLM-produced titanium alloy components. It is aimed to outline the effect of SLM process parameters on tribology and surface integrity first. Then, thermal, thermal heat, thermomechanical and postprocessing surface treatments such as peening, surface modification and coatings are highlighted in the light of literature review.
Findings
This work studied the effects of particle characteristics (e.g. size, shape, distributions, flowability and morphology) on tribological performance according to an extensive literature survey.
Originality/value
This study addresses this blind spot in existing industrial-academic knowledge and goals to determine the impact of SLM process parameters, posttreatments (especially peening operations) and particle characteristics on the SLMed Ti-based alloys, which are increasingly used in biomedical applications as well as other many applications ranging from automobile, aero, aviation, maritime, etc. This review paper is created with the intention of providing deep investigation on the important material characteristics of titanium alloy-based components, which can be useful for the several engineering sectors.