scholarly journals Design and Fabrication of Small Vertical-Take-Off-Landing Unmanned Aerial Vehicle

2018 ◽  
Vol 152 ◽  
pp. 02023 ◽  
Author(s):  
Yasir Ashraf Abd Rahman ◽  
Mohammad Taghi Hajibeigy ◽  
Abdulkareem Shafiq Mahdi Al-Obaidi ◽  
Kean How Cheah
Keyword(s):  
Design Methodology ◽  
The Other ◽  
Long Distance ◽  
Open Spaces ◽  
Flight Tests ◽  
Flight Range ◽  
Horizontal Flight ◽  
Vtol Uav ◽  
Aerial Vehicle ◽  
Horizontal Thrust

Modern UAVs available in the market have well-developed to cater to the countless field of application. UAVs have their own limitations in terms of flight range and manoeuvrability. The traditional fixed-wing UAVs can fly for long distance but require runways or wide-open spaces for take-off and landing. On the other hand, the more trending multirotor UAVs are extremely manoeuvrable but cannot be used for long-distance flights because of their slower speeds and relatively higher consumption of energy. This study proposed the implementation of hybrid VTOL UAV which has the manoeuvring advantage of a multirotor UAV while having the ability to travel fast to reach a further distance. The design methodology and fabrication method are discussed extensively which would be followed by a number of flight tests to prove the concept. The proposed UAV would be equipped with quadcopter motors and a horizontal thrust motor for vertical and horizontal flight modes respectively.

scholarly journals Research on Dynamic Modeling and Transition Flight Strategy of VTOL UAV

2019 ◽  
Vol 9 (22) ◽  
pp. 4937
Author(s):  
Chunyang Wang ◽  
Zhou Zhou ◽  
Rui Wang
Keyword(s):  
Flight Simulation ◽  
Flight Performance ◽  
Research Focus ◽  
Transition Mode ◽  
Flight Mode ◽  
Horizontal Flight ◽  
Vtol Uav ◽  
Aerial Vehicle ◽  
Control Quantity ◽  
Transition Flight

A vertical take-off and landing (VTOL) unmanned aerial vehicle (UAV) can meet both VTOL and horizontal flight performance, but how to achieve a safe and stable transition is a research focus of this type of aircraft. According to the overall configuration characteristics of VTOL UAV, aerodynamic models of lift fan, lift duct and induced wing surface of VTOL UAV were established. Three flight modes of induced VTOL UAV are studied, including hover, transition and horizontal flight. The method of longitudinal flight balance of UAV in transition mode is also studied. Finally, a UAV is taken as an example to conduct the research of transition flight mode balancing and flight simulation with the method presented in this paper. The results show that the proposed method can reasonably give the control quantity and longitudinal attitude of UAV in the whole transition mode, so that the UAV can achieve a steady transition flight.

Design, Modelling and Simulation of Maritime UAV-VTOL Flight Dynamics

2012 ◽  
Vol 152-154 ◽  
pp. 1533-1538
Author(s):  
Jun Cao ◽  
Amir M. Anvar
Keyword(s):  
Structural Design ◽  
Water Surface ◽  
Unmanned Aircraft ◽  
The Other ◽  
Underwater Robot ◽  
Unmanned Air Vehicle ◽  
Vtol Uav ◽  
Air Vehicle ◽  
Remotely Piloted Aircraft ◽  
Aerial Vehicle

An Unmanned Aerial Vehicle (UAV) is referred to as a remotely piloted aircraft or an unmanned aircraft which can be navigated with human operator in the loop. This paper discusses the design of a UAV with Vertical Take-Off and Landing (VTOL) capability for Maritime applications. The design provides a means for surveillance and communication in Maritime applications. The VTOL-UAV utilises a five-rotor propulsion system that can be launched from confined platforms such as ship-decks. The intended applications of this M-UAV drove the development of an innovative landing system which in the case of emergencies can allow the M-UAV’s soft and potential landing on the water surface. The other functionalities of this UAV are its capabilities to deploy communication Micro-sonobuoys which allows for communication with underwater Robot(s) via Operator in the loop. In this paper we also discuss the process of structural design modelling and evaluation of the development of the Maritime Unmanned Air Vehicle.

scholarly journals Teaching innovations in Asian higher education: perspectives of educators

2018 ◽  
Vol 13 (2) ◽  
pp. 179-190 ◽  
Author(s):  
T.M. Wong
Keyword(s):  
Higher Education ◽  
Design Methodology ◽  
Higher Education Institutions ◽  
The Other ◽  
Asian Countries ◽  
Structured Interviews ◽  
Content Type ◽  
Advanced Technologies ◽  
The Many

Purpose The purpose of this paper is to identify the teaching innovations that have been implemented in higher education institutions in Asia and the perspectives of educators on them. Design/methodology/approach Semi-structured interviews were conducted with 28 educators who were affiliated with 23 higher education institutions in ten Asian countries/regions. The interviews covered information about the teaching innovations of the participants’ institutions, the characteristics of the innovative practices and the participants’ views on them. The relationships between the characteristics of institutions and their teaching innovations were also examined. Findings The results showed that the teaching innovations included two main categories, namely, those which involved the use of advanced technologies and those which did not. The innovations that involved the use of advanced technologies were mainly from larger institutions, while the other category was mainly from smaller ones and had been practised for less than 1.5 years. Differences were also identified between the two categories in terms of the aims and importance of innovations, innovative features, the evaluation of innovations and improvements needed for them. Originality/value The results highlighted that technology is only one of the many aspects of teaching innovations, which is different from the view prevailing in the literature. They also suggested that differences in the scale of institutions (in terms of number of students) possibly influences the kind of teaching innovations adopted.

Formation of contracts for the international sale of goods under Korean law and the CISG

2017 ◽  
Vol 21 (3) ◽  
pp. 208-223
Author(s):  
Byung Mun Lee
Keyword(s):  
Comparative Study ◽  
Design Methodology ◽  
Case Law ◽  
The Other ◽  
Basic Question ◽  
Content Type ◽  
International Sale Of Goods ◽  
The Comparative Study ◽  
International Sales ◽  
Insight Into

Purpose The purpose of this paper is to describe and analyze the rules on the formation of contracts under Korean law and the Contracts for the International Sale of Goods (CISG) in a comparative way and introduce the relevant proposed rules under the Amendment Draft of the Korean Civil Code (KCC). In addition, it attempts to compare and evaluate them in light of the discipline of comparative law. Design/methodology/approach In order to achieve the purposes of the study, it executes a comparative study of the rules as to the formation of contracts of the CISG, Korean law and the Amendment Draft of the KCC. The basic question for this comparative study is placed on whether a solution from one jurisdiction is more logical than the others and to what extent each jurisdiction has responded to protect the reasonable expectations of the parties in the rules as to the formation of contracts. Findings The comparative study finds that most of the rules under the CISG are quite plausible and logical and they are more or less well reflected in the proposals advanced by the KCC amendment committee. On the other hand, the other rules under the CISG which have brought criticisms in terms of their complexity and inconsistent case law invite us their revision or consistent interpretation. The drawbacks of the CISG have also been well responded in the Amendment Draft of the KCC. Nevertheless, it is quite unfortunate that the Amendment Draft of the KCC still has a rule that regards any purported performance with non-material alteration of the terms of an offer as an acceptance. Originality/value This study may provide legal and practical advice to both the seller and the buyer when they enter into a contract for international sales of goods. In addition, it may render us an insight into newly developed or developing rules in this area and show us how they interact with each other. Furthermore, it may be particularly useful in Korea where there is an ongoing discussion for revision of the KCC.

Measuring the service gaps in the roles of quantity surveyors in the emerging market

2016 ◽  
Vol 23 (5) ◽  
pp. 1111-1131 ◽  
Author(s):  
AbdulLateef Olanrewaju
Keyword(s):  
Emerging Markets ◽  
Construction Industry ◽  
Design Methodology ◽  
Emerging Market ◽  
Supply And Demand ◽  
The Other ◽  
Primary Data ◽  
Content Type ◽  
Practical Implications ◽  
Survey Questionnaires

Purpose – The opportunities that the emerging markets present to the players in the construction industry means that the players need to expand on the scope and size of their responsibilities and duties to the stakeholders. Each of the professionals now demands more specialised and sophisticated services from one another. The other players in the construction industry now require more emerging responsibilities and duties from the quantity surveyors. The purpose of this paper is to examine the roles that “modern” quantity surveyors play by measuring the gaps that exist in the services that the quantity surveyors provide. Design/methodology/approach – Primary data are collected through survey questionnaires. In total, 23 roles played by modern quantity surveyors are identified and addressed to the respondents to rank the rate at which quantity surveyors provide these “emerging” services. The collected data were analysed statistically. Findings – The results of the findings led to the conclusion that the quantity surveyors were not meeting the expectations of other players. Therefore, for competitiveness, quantity surveyors need to better meet demand expectations. Research limitations/implications – This findings of this research are constrained to the services or functions that the quantity provide in the construction industry. Practical implications – This knowledge is valuable to academic institutions that offer quantity surveying programmes, to practicing quantity surveyors, governments, and other players in the construction industry. It will allow quantity surveyors to reconcile supply and demand expectations. Originality/value – There is no known conclusive empirical study on services offered by quantity surveyors in any emerging markets. Therefore, the findings offer a fresh understanding on the services of quantity surveyors not only in Nigeria but elsewhere. While some of the services are common, others are peculiar to emerging markets.

Tolstoy in a recipe

2014 ◽  
Vol 44 (4) ◽  
pp. 310-323 ◽  
Author(s):  
Ana Tominc
Keyword(s):  
Design Methodology ◽  
The Other ◽  
Food Culture ◽  
Content Type ◽  
Current Trends ◽  
New Middle Class ◽  
Cooking Shows ◽  
Local Construction ◽  
The Impact ◽  
The Relationship

Purpose – The purpose of this study is to demonstrate the impact of global celebrity chefs and their discourse about food on the genre of cookbooks in Slovenia. Design/methodology/approach – Focusing this discourse study on cookbook topics only, the analysis demonstrates the relationship between the aspirations of local celebrity chefs for the food culture represented globally by global celebrity chefs, such as Oliver, and the necessity for a local construction of specific tastes. While the central genre of TV celebrity chefs remains TV cooking shows, their businesses include a number of side products, such as cookbooks, which can be seen as recontexualisations of TV food discourse. Findings – Hence, despite this study being limited to analysis of cookbooks only, it can be claimed that the findings extend to other genres. The analysis shows that local chefs aspire to follow current trends, such as an emphasis on the local and sustainable production of food as well as enjoyment and pleasure in the form of a postmodern hybrid genre, while, on the other hand, they strive to include topics that will resonate locally, as they aim to represent themselves as the “new middle class”. Originality/value – Such an analysis brings new insights into the relationship between discourse and globalisation as well as discourse and food.

Adoption of integrated reporting in Sri Lanka: coverage and trend

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Thilini Cooray ◽  
Samanthi Senaratne ◽  
Nuwan Gunarathne ◽  
Roshan Herath ◽  
Dileepa Neelangi Samudrage
Keyword(s):  
Sri Lanka ◽  
Design Methodology ◽  
The Other ◽  
Sri Lankan ◽  
Legitimacy Theory ◽  
Integrated Reporting ◽  
Content Type ◽  
Disclosure Requirements ◽  
Comprehensive Index ◽  
Reporting Framework

Purpose This paper aims to examine the coverage of and trends in reporting content elements in the integrated reports of the Sri Lankan companies following the International Integrated Reporting Framework (IIRF). Design/methodology/approach Based on a comprehensive checklist developed on the content elements of the IIRF, 171 corporate integrated reports were content-analyzed over a period of three years. The results were theorized subsequently using the legitimacy theory. Findings The study identifies that the extent of and trend in the coverage of content elements of the IIRF have increased during the period under consideration despite some under-addressed areas. It indicates that Sri Lankan companies are making progress in the preparation of integrated reports in line with the IIRF, which provides evidence in support of both strategic and institutional perspectives of the legitimacy theory because of the proactive actions taken by managers to acquire legitimacy along with the other normative and mimetic pressures available in the IR landscape. Originality/value This is one of the first studies that evaluate the compliance of IR adopters with the IIRF overtime in the entirety of a single country. It also develops a comprehensive index to capture the disclosure requirements of IR and extends the analysis to a voluntary context using both strategic and institutional perspectives of the legitimacy theory.

System Identification of an Unmanned Aerial Vehicle from Automated Flight Tests

2002 ◽  
Author(s):  
Younsaeng Lee ◽  
Seungjoo Kim ◽  
Jinyoung Suk ◽  
Hueonjoon Koo ◽  
Jongseong Kim
Keyword(s):  
System Identification ◽  
Unmanned Aerial Vehicle ◽  
Flight Tests ◽  
Aerial Vehicle

Autopilot design for an aircraft by using Luenberger observer design

2018 ◽  
Vol 90 (5) ◽  
pp. 858-868 ◽  
Author(s):  
Muhammad Taimoor ◽  
Li Aijun ◽  
Rooh ul Amin ◽  
Hongshi Lu
Keyword(s):  
Design Methodology ◽  
Research Work ◽  
Linear Quadratic Regulator ◽  
Observer Design ◽  
Linear Quadratic ◽  
Content Type ◽  
Luenberger Observer ◽  
Level Flight ◽  
Aerial Vehicle ◽  
The Cost

Purpose The purpose of this paper is to design linear quadratic regulator (LQR) based Luenberger observer for the estimation of unknown states of aircraft. Design/methodology/approach In this paper, the LQR-based Luenberger observer is deliberated for autonomous level flight of unmanned aerial vehicle (UAV) which has been attained productively. Various modes like phugoid and roll modes are exploited for controlling the rates of UAV. The Luenberger observer is exploited for estimation of the mysterious states of the system. The rates of roll, yaw and pitch are used as an input to the observer, while the remaining states such as velocities and angles have been anticipated. The main advantage of using Luenberger observer was to reduce the cost of the system which has been achieved lucratively. The Luenberger observer proposes sturdiness at the rate of completion to conquest over the turmoil and insecurities to overcome the privileged recital. The FlightGear simulator is exploited for the endorsement of the recital of the Luenberger observer-based autopilot. The level flight has been subjugated lucratively and has been legitimated by exploiting the FlightGear simulator. The authenticated and the validated results are offered in this paper. Microsoft Visual Studio has been engaged as a medium between the MATLAB and FlightGear Simulator. Findings The suggested observer based on LQR ensures the lucrative approximation of the unknown states of the system as well as the successful level flight of the system. The Luenberger observer is used for approximation of states while LQR is used as controller. Originality/value In this research work, not only the estimation of unknown states of both longitudinal and lateral model is made but also the level flight is achieved by using those estimated states and the autopilot is validated by using the FlightGear, while in most of the research work only the estimation is made of only longitudinal or lateral model.

Do Twitter phenomena check-in popular venues on Foursquare too?

2018 ◽  
Vol 46 (3) ◽  
pp. 137-146
Author(s):  
Aysun Bozanta ◽  
Birgul Kutlu
Keyword(s):  
Clustering Analysis ◽  
Design Methodology ◽  
Business Owners ◽  
Marketing Strategies ◽  
The Other ◽  
Shopping Mall ◽  
Content Type ◽  
History Of ◽  
Twitter Users ◽  
Different Characteristics

Purpose The purpose of this study is to figure out the visiting behaviors of the users who have different characteristics on Twitter. Design/methodology/approach The visit history of users who share their Foursquare check-ins on Twitter and the characteristics of visited venues (category, check-in count, tip count, like count, rating, and price tier) was collected with Foursquare API. In addition, the number of followers, friends, tweets and favorite-count were collected via Twitter API. First, users were clustered according to their Twitter related attributes. After that, profiling was applied on clusters according to the characteristics of the venues that were visited by the users. Findings Clustering analysis generated three clusters, namely, ordinary, talkative and popular. For each cluster, the visited venues were investigated according to the price classification, check-in, like, tip counts and the categories. The users in ordinary class prefer cheaper venues rather than talkative and popular users. On the other hand, popular users prefer the venues with the highest average number of check-ins, likes and tip counts. The top two categories for all clusters are cafe and shopping mall. Originality/value This study differentiates from the other studies in the literature by examining the data from Twitter with clustering and profiling these clusters with Foursquare data to understand venue preferences of Twitter users having various characteristics. The findings of this study will provide new insights for business owners to understand the customers more comprehensively and design better marketing strategies.

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