scholarly journals Conceptual design of an aircraft for Mars mission

2019 ◽  
Vol 91 (6) ◽  
pp. 886-892
Author(s):  
Agnieszka Kwiek
Keyword(s):  
Stability Analysis ◽  
Dynamic Stability ◽  
Conceptual Design ◽  
Design Stage ◽  
Content Type ◽  
Mars Mission ◽  
Longitudinal Dynamic ◽  
Short Period ◽  
The Impact ◽  
Tailless Aircraft

Purpose The purpose of this paper is to present the results of a conceptual design of Martian aircraft. This study focuses on the aerodynamic and longitudinal dynamic stability analysis. The main research questions are as follows: Does a tailless aircraft configuration can be used for Martian aircraft? How to the short period characteristic can be improved by side plates modification? Design/methodology/approach Because of a conceptual design stage of this Martian aircraft, aerodynamic characterises were computed by the Panukl package by using the potential flow model. The longitudinal dynamic stability was computed by MATLAB code, and the derivatives computed by the SDSA software were used as the input data. Different aircraft configurations have been studied, including different wing’s aerofoils and configurations of the side plate. Findings This paper presents results of aerodynamic characteristics computations and longitudinal dynamic stability analysis. This paper shows that tailless aircraft configuration has potential to be used as Martian aircraft. Moreover, the study of the impact of side plates’ configurations on the longitudinal dynamic stability is presented. This investigation reveals that the most effective method to improve the short period damping ratio is to change the height of the bottom plate. Practical implications The presented result might be useful in case of further design of the aircrafts for the Mars mission and designing the aircrafts in a tailless configuration. Social implications It is considered by the human expedition that Mars is the most probable planet to explore. This paper presents the conceptual study of aircraft which can be used to take the high-resolution pictures of the surface of Mars, which can be crucial to find the right place to establish a potential Martian base. Originality/value Most of aircrafts proposed for the Mars mission are designed in a configuration with a classic tail; this paper shows a preliminary calculation of the tailless Martian aircraft. Moreover, this paper shows the results of a dynamic stability analysis, where similar papers about aircrafts for the Mars mission do not show such outcomes, especially in the case of the tailless configuration. Moreover, this paper presents the results of the dynamic stability analysis of tailless aircraft with different configurations of the side plates.

scholarly journals A numerical study into the longitudinal dynamic stability of the tailless aircraft

2019 ◽  
Vol 91 (3) ◽  
pp. 428-436 ◽  
Author(s):  
Agnieszka Kwiek
Keyword(s):  
Stability Analysis ◽  
Dynamic Stability ◽  
Numerical Study ◽  
Aircraft Design ◽  
Content Type ◽  
Preliminary Stage ◽  
Longitudinal Dynamic ◽  
Stability Derivatives ◽  
The Impact ◽  
Tailless Aircraft

Purpose The purpose of this research is a study into a mathematical approach of a tailless aircraft dynamic stability analysis. This research is focused on investigation of influence of elevons (elevator) on stability derivatives and consequently on the aircraft longitudinal dynamic stability. The main research question is to determine whether this impact should be taken into account on the conceptual and preliminary stage of the analysis of the longitudinal dynamic stability. Design/methodology/approach Aerodynamic coefficients and longitudinal stability derivatives were computed by Panukl (panel methods). The analysis of the dynamic stability of the tailless aircraft was made by the Matlab code and SDSA package. Findings The main result of the research is a comparison of the dynamic stability of the tailless aircraft for different approaches, with and without the impact of elevator deflection on the trim drag and stability derivatives. Research limitations/implications This paper presents research that mostly should be considered on the preliminary stage of aircraft design and dynamic stability analysis. The impact of elevons deflection on the aircraft moment of inertia has been omitted. Practical implications The results of this research will be useful for the further design of small tailless unmanned aerial vehicles (UAVs). Originality/value This research reveals that in case of the analysis of small tailless UAVs, the impact of elevons deflection on stability derivatives is bigger than the impact of a Mach number. This impact should be taken into consideration, especially for a phugoid mode.

When I am old I shall wear purple: a qualitative study of the effect of group poetry sessions on the well-being of older adults

2016 ◽  
Vol 20 (4) ◽  
pp. 195-198 ◽  
Author(s):  
Richard Seymour ◽  
Michael Murray
Keyword(s):  
Older People ◽  
Assisted Living ◽  
Well Being ◽  
Content Type ◽  
Short Period ◽  
Different Types ◽  
Poetry Reading ◽  
The Impact ◽  
Health And Well Being ◽  
Practical Implications

Purpose There is increasing evidence that participation in various art forms can be beneficial for health and well-being. The purpose of this paper is to examine the impact of participating in a poetry reading group on a group of older residents of an assisted living facility. Design/methodology/approach Six poetry sessions, each on a different theme, were conducted with a group of volunteer participants. These sessions, those of pre- and post-study focus groups and interviews with the group facilitator and staff contact were audio-recorded. The transcripts of the recordings were then subjected to a thematic analysis. Findings Overall the participants were enthused by the opportunity to participate in the project and the benefits were confirmed by the support staff. In addition, reading poetry on particular themes promoted different types of discussion. Research limitations/implications The number of participants in this study was small and the study was conducted over a short period of time. Practical implications This paper confirms the impact of poetry reading for older people. The challenge is to explore this impact in more detail and over community as well as residential settings. Originality/value This paper is the first empirical report on the value of poetry reading for older people.

An investigation of the mass-market fashion design process

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Prabod Dharshana Munasinghe ◽  
D.G.K. Dissanayake ◽  
Angela Druckman
Keyword(s):  
Design Process ◽  
Market Design ◽  
High Volume ◽  
Design Stage ◽  
Fashion Design ◽  
Structured Interviews ◽  
Mass Market ◽  
Content Type ◽  
Responsible Consumption ◽  
The Impact

Purpose The process of fashion design varies between market segments, yet these variations have not yet been properly explored. This study aims to examine the fashion design process as practised at the mass-market level, as this is the most vibrant and the largest market segment in terms of production volumes and sales. Design/methodology/approach It is observed that 15 semi-structured interviews were conducted with mass-market fashion designers. Key activities of the mass-market design process were identified and a comparative analysis was conducted with the general design process. Findings The mass-market design process is found to prioritise profits rather than aesthetic aspects, with the buyer exercising more power than the designer. This hinders creativity, which, in turn, may impede a move towards more environmentally benign designs. Originality/value The clothing industry is responsible for high environmental impacts and many of these impacts arise through decisions made in the design stage. In particular, the mass-market for clothing because of its high volume of sales and fast throughput, accounts for a great deal of the impact. However, little is understood about the design process that is practised in the mass-fashion market. This paper fills the gap by developing a framework that describes the mass-market design process. Understanding the design process will enable progress to be made towards achieving the United Nations Sustainable Development Goal 12: Responsible Consumption and Production.

scholarly journals Dynamic Stability and Control of a Manipulating Unmanned Aerial Vehicle

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yunping Liu ◽  
Xijie Huang ◽  
Yonghong Zhang ◽  
Yukang Zhou
Keyword(s):  
Stability Analysis ◽  
Lyapunov Exponent ◽  
Dynamic Stability ◽  
Unmanned Aerial Vehicle ◽  
Impedance Control ◽  
System Stability ◽  
Constructive Method ◽  
Aerial Vehicle ◽  
And Control ◽  
The Impact

This paper focuses on the dynamic stability analysis of a manipulator mounted on a quadrotor unmanned aerial vehicle, namely, a manipulating unmanned aerial vehicle (MUAV). Manipulator movements and environments interaction will extremely affect the dynamic stability of the MUAV system. So the dynamic stability analysis of the MUAV system is of paramount importance for safety and satisfactory performance. However, the applications of Lyapunov’s stability theory to the MUAV system have been extremely limited, due to the lack of a constructive method available for deriving a Lyapunov function. Thus, Lyapunov exponent method and impedance control are introduced, and the Lyapunov exponent method can establish the quantitative relationships between the manipulator movements and the dynamics stability, while impedance control can reduce the impact of environmental interaction on system stability. Numerical simulation results have demonstrated the effectiveness of the proposed method.

The consideration of building maintenance at design stage in public buildings

Facilities ◽  
2019 ◽  
Vol 37 (13/14) ◽  
pp. 942-960 ◽  
Author(s):  
Ellemy Iskandar Khalid ◽  
Shardy Abdullah ◽  
Mohd Hanizun Hanafi ◽  
Shahrul Yani Said ◽  
Mohamad Sufian Hasim
Keyword(s):  
Maintenance Management ◽  
Design Stage ◽  
Management Approach ◽  
Public Buildings ◽  
Content Type ◽  
Building Maintenance ◽  
Key Players ◽  
The Government ◽  
The Impact ◽  
Proactive Maintenance

Purpose Effective building maintenance management is vital for reducing the impact of building defects and costly building maintenance work. Such practice significantly contributes to the public sector in terms of cost reduction, improved effectiveness and efficiency in maintenance works, increasing safety and well-being of the occupants, expanding the life of building stocks and expanding the value of investment for the government building assets. The maintenance practice in Malaysia is still emerging in comparison to many developed nations. The purpose of this study is to determine the current scenario of the building maintenance approach at the design stage in public buildings in Malaysia. Design/methodology/approach An extensive questionnaire survey was held, involving 312 key players (38 per cent out of 820 predetermined participants) in Malaysia. Findings The analysis showed that building maintenance in public building in Malaysia still uses the reactive approach. Despite the Malaysian Government’s adoption of a proactive maintenance approach, unfortunately, there are some misunderstandings among the key players regarding the approach. The research results demonstrate that the key players had a lack of understanding on the concept of the proactive maintenance management approach and that they were either ignorant or had insufficient awareness of proactive maintenance approach. Originality/value The contribution of this study is useful for the government to adopt a more proactive building maintenance policy at the design stage, to give awareness on proactive building maintenance to the key players in their construction project and as a guide to the key players to adopt a maintenance plan at the design stage of work.

Subsidiary ownership decisions by bank holding companies

2019 ◽  
Vol 12 (3) ◽  
pp. 425-444
Author(s):  
Wenling Lu ◽  
Wan-Jiun Paul Chiou
Keyword(s):  
Institutional Investors ◽  
Fixed Effects ◽  
Institutional Ownership ◽  
Bank Holding Companies ◽  
Best Interest ◽  
Content Type ◽  
Holding Companies ◽  
Short Period ◽  
The Usa ◽  
The Impact

Purpose This study aims to examine the intertemporal changes in the institutional ownership of publicly traded bank holding companies (BHCs) in the USA. The role of owned-subsidiary investing in the portfolio decisions is investigated as compared to unaffiliated banks and non-bank institutional investors. Design/methodology/approach The authors apply panel regressions that control bank-fixed and time-fixed effects to study the impact of prudence, liquidity, information advantages and historical returns on each type of the institutional ownership from 1986 to 2014. Findings The subsidiary banks tend to invest in more shares of their parent BHCs when they are traded for a short period of time and when they have low-market risk, low turnover, a low capital equity ratio and great reliance on off-balance activities. However, the impact of these determinants of institutional ownership is opposite for unaffiliated banks and non-bank institutions. Research limitations/implications This study provides evidence that the criteria used by subsidiary banks to invest in their parent company stock are different than the unaffiliated banks and non-bank institutions, raising concerns about the owned-subsidiary investing activities and banks’ trustees’ duty to work in the best interest of their trust clients. Originality/value This paper provides a comprehensive analysis of the level and market value of BHC institutional ownership over the past three decades and the impact of different determinants on the ownership of BHCs by subsidiary banks, unaffiliated banks and non-bank institutional investors.

Evaluation Method for Conceptual Design Scheme Based on Fuzzy Mathematics

2012 ◽  
Vol 591-593 ◽  
pp. 25-29
Author(s):  
Peng Fei Tian ◽  
Shi Yan ◽  
Bi Ru Li
Keyword(s):  
Decision Making ◽  
Conceptual Design ◽  
New Product Development ◽  
Evaluation Method ◽  
Design Stage ◽  
Fuzzy Mathematics ◽  
Qualitative Information ◽  
Design Scheme ◽  
The Impact ◽  
Mathematics Method

Selecting the favorable conceptual design scheme is the first step to make a new product development (NPD) successfully. To guarantee reliability and rationality of decision-making about multiple design schemes in conceptual design stage under the impact of uncertainties and qualitative information, we have employed KJ method to cluster the evaluation factors into 5 clusters such as emotion, ergonomics, aesthetics, core technology, and impact; and fuzzy mathematics method to deal with uncertainties and qualitative information effectively. The weights of evaluation factors were calculated by analytical hierarchy process (AHP). Fuzzy mathematics method is the comprehensive evaluation method and quantitative analysis which based on the “maximum membership degree evaluation”. All design schemes are ranked and selected according to the multiple evaluation score of parts with their weights. Finally, a case study for decision-making is presented to demonstrate the application of the evaluation method.

Lesson study at the foreign language university level in Japan

2015 ◽  
Vol 4 (4) ◽  
pp. 362-382 ◽  
Author(s):  
Bruce Lander
Keyword(s):  
Foreign Language ◽  
Blended Learning ◽  
Lesson Study ◽  
Technology In Education ◽  
Content Type ◽  
Theoretical Concepts ◽  
Modern Age ◽  
Short Period ◽  
Regular Classrooms ◽  
The Impact

Purpose – The purpose of this paper is to determine if a blended learning component can aid professional development, improve student ability and be approved at the foreign language level using the lesson study (LS) method at a university in Japan. Design/methodology/approach – This paper introduces the three main theoretical concepts of blended learning, learner autonomy and technology in education before explaining the LS in full. Two groups of students were taught using almost identical syllabus. One group, the A group were taught using computer rooms for two semesters, while the other (B) group were taught in regular classrooms without computers for one semester then with computers for the following semester. The impact on the student and teacher will be discussed. Findings – The findings of this study indicate that technology, in the form of a blended learning component added to a test-based curriculum, can enhance student test-scores, raise teacher and student awareness of technology and improve ability over a relatively short period. Practical implications – This study emphasizes the power of technology in modern day education. Through blended learning methodology this study proposes that teachers in the modern age should adopt some form of technology into their teaching technique. Originality/value – This paper is directed at teachers who are interested in integrating technology into their teaching techniques, through either computer aided or mobile assisted learning, but are slightly apprehensive in doing so. This study focuses on the introduction of an online and mobile digital flashcard tool called Quizlet. Very little literature exists in this field as the mobile application was only released in 2013.

Systems Engineering Approach for Pre-Conceptual Design of DEMO Divertor

2018 ◽  
Author(s):  
Domenico Marzullo ◽  
Danilo N. Dongiovanni ◽  
Jeong Ha You
Keyword(s):  
Power Plant ◽  
Change Management ◽  
Conceptual Design ◽  
Systems Engineering ◽  
Life Cycles ◽  
Design Stage ◽  
Fusion Power ◽  
Fusion Power Plant ◽  
Engineering Approach ◽  
The Impact

The DEMOnstration Fusion power Plant (DEMO) will be a key step towards Fusion Power Plant technology. It represents the single step to a commercial fusion power plant, in charge of demonstrating the viability of relevant technologies. Indeed, the development of tokamak sub-systems has to take into account interface, structural and functional requirements and multi-physics issues that can be completely known only during the development of the design process. This leads to difficulties to be faced during the conceptual design, mainly related to the identification of the main requirements, the change management and the sub-system integration. The Systems Engineering approach aims to support the design and management of complex systems over their life-cycles, providing a systematic approach for the definition of customer needs and required functionality from the early stage of the design, as well as for the design synthesis and the system validation and verification. Among the tokamak sub-systems, the divertor is the one devoted to power exhaust management and represents, at the same time, one of the most challenging components, in terms of materials, technologies and manufacturing. Current design activities, conducted in the in the framework of EUROfusion Consortium are in a pre-conceptual phase. Despite the early design stage, a systems engineering approach is being applied as an integrated, interdisciplinary R&D effort. The paper therefore presents the modeling effort to the conceptual design of DEMO divertor aimed at identifying both system main functions and expected behavior, given the constraints imposed from either project requirement or from current viability of technological solutions. To allow for flexibility in design needed to explore the feasibility of different solutions at this pre-conceptual stage, the impact of possible changes in high level requirement or interfaces is also investigated. This is also achieved through the allocation of the requirements to the affected components and providing efficient traceability. Therefore, the proposed modelling approach is intended to support the whole divertor conceptual design stage, allowing for requirements identification, traceability and change management.

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