Take-off control and characteristics of FanWing

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lin Meng ◽  
Yang Gao ◽  
Yangyang Liu ◽  
Shengfang Lu
Keyword(s):  
Control System ◽  
Control Systems ◽  
Design Methodology ◽  
Control System Design ◽  
Control Methods ◽  
Force Analysis ◽  
Close Attention ◽  
Content Type ◽  
Vehicle Load ◽  
Practical Implications

Purpose As a short take-off and landing aircraft, FanWing has the capability of being driven under power a short distance from a parking space to the take-off area. The purpose of this paper is to design the take-off control system of FanWing and study the factors that influence the short take-off performance under control. Design/methodology/approach The force analysis of FanWing is studied in the take-off phase. Two take-off control methods are researched, and several factors that influence the short take-off performance are studied under control. Findings The elevator and fan wing control systems are designed. Although the vehicle load increases under the fan wing control, the fan wing control is not a recommended practice in the take-off phase for its sensitivity to the pitch angle command. The additional pitch-down moment has a significant influence on the control system and the short take-off performance that the barycenter variation of FanWing should be considered carefully. Practical implications The presented efforts provide a reference for the location of the center of gravity in designing FanWing. The traditional elevator control is more recommended than the fan wing control in the take-off phase. Originality/value This paper offers a valuable reference on the control system design of FanWing. It also proves that there is an additional pith-down moment that needs to be paid close attention to. Four factors that influence the short take-off performance are compared under control.

Effects of the actively morphing root chord and taper on helicopter energy

2019 ◽  
Vol 92 (2) ◽  
pp. 264-270
Author(s):  
Firat Sal
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Flight Control ◽  
Design Methodology ◽  
Chord Length ◽  
Flight Control System ◽  
Content Type ◽  
Helicopter Blade ◽  
Blade Root ◽  
Practical Implications

Purpose The purpose of this paper presents the effects of actively morphing root chord and taper on the energy of the flight control system (i.e. FCS). Design/methodology/approach Via regarding previously mentioned purposes, sophisticated and realistic helicopter models are benefitted to examine the energy of the FCS. Findings Helicopters having actively morphing blade root chord length and blade taper consume less control energy than the ones having one of or any of passively morphing blade root chord length and blade taper. Practical implications Actively morphing blade root chord length and blade taper can be used for cheaper helicopter operations. Originality/value The main originality of this paper is applying active morphing strategy on helicopter blade root chord and blade taper. In this paper, it is also found that using active morphing strategy on helicopter blade root chord and blade taper reasons less energy consumption than using either passively morphing blade root chord length plus blade taper or not any. This causes also less fuel consumption and green environment.

Observed effectiveness of the COSO 2013 framework

2019 ◽  
Vol 16 (1) ◽  
pp. 31-45
Author(s):  
Ifeoma Udeh
Keyword(s):  
Control Systems ◽  
Internal Control ◽  
Design Methodology ◽  
Control Process ◽  
Regression Analyses ◽  
Section 404 ◽  
Content Type ◽  
Sarbanes Oxley ◽  
Material Weaknesses ◽  
Practical Implications

Purpose This paper aims to examine the effectiveness of the Committee of Sponsoring Organization’s 2013 Framework, by investigating how the number of auditor-reported material weaknesses compares for Early-, Timely- and Late-adopters of the framework, and how the number of auditor-reported material weaknesses changed for Early- and Timely-adopters following their adoption of the framework. Design/methodology/approach The paper uses regression analyses based on a sample of US firms subject to Sarbanes-Oxley Act Section 404(b). Findings Timely-adopters of the 2013 Framework continued to exhibit fewer instances of auditor-reported material weaknesses than Late-adopters, even though they had a marginal increase in the number of auditor-reported material weaknesses, in the post-2013 Framework period. Practical implications The findings suggest that the effectiveness of the 2013 Framework may lie in the iterative nature of the internal control process, and as firms remedy deficiencies they or their auditors identify, they will continuously improve the effectiveness of their internal control systems. Originality/value Unlike existing literature, this paper uses data from the pre-2013 Framework, transition and post-2013 Framework periods to examine changes in the number of auditor-reported material weaknesses, thus differentiating between Early-, Timely- and Late-adopters of the 2013 Framework. It also shows the effect of adopting the 2013 Framework on the number of auditor-reported material weaknesses.

Controls amid the chaos

2017 ◽  
Vol 33 (4) ◽  
pp. 13-15
Keyword(s):  
Control Systems ◽  
Design Methodology ◽  
Reading Time ◽  
Management Control ◽  
Management Control Systems ◽  
Content Type ◽  
Digital Revolution ◽  
Time Dynamics ◽  
Pertinent Information ◽  
Practical Implications

Purpose This paper aims to review the latest management developments across the globe and pinpoint 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 Evolving industries, the digital revolution and the effect of the global economic crisis has entailed huge challenges for those seeking to implement management control systems. In her article “Organizations with changing structures: how to control?” (2016), author Eva Lechner pulls aside the curtains on a festival organizer and shows that while its time dynamics and culture are very different to most industries, the need for controls still apply, and they can be successfully applied as long as keen attention is paid to their consequences. Practical implications The paper provides strategic insights and practical thinking that have influenced some of the world’s leading organizations. 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.

The stewardship organization: essential characteristics and conditions of feasibility

2020 ◽  
Vol 35 (3/4) ◽  
pp. 175-190
Author(s):  
Mark Lehrer ◽  
Lydia Segal
Keyword(s):  
Control Systems ◽  
Internal Control ◽  
Design Methodology ◽  
Content Type ◽  
Agent Behavior ◽  
Bona Fide ◽  
Facilitating Conditions ◽  
Stewardship Behavior ◽  
Practical Implications

PurposeThe paper explores the nature and facilitating conditions of “stewardship organizations,” that is, organizations in which stewardship behavior rather than principal–agent behavior defines the operative principles of management.Design/methodology/approachThe paper falls into two parts: the first part of the analysis develops a theory of the stewardship organization, and the second part develops a contingency framework concerning the feasibility of stewardship organizations.FindingsStewardship organizations are characterized by three interlocking traits: (1) the overall mission of the organization, (2) the organization's internal control systems and (3) the “motivational environment” of the stewardship organization. Since stewardship organizations cannot be identified on the basis of stated mission alone, it is necessary to determine whether the mission involves a higher calling that has been internalized by organizational members to the point of constituting a vital part of how the organization runs on a day-to-day basis.Practical implicationsOne key role of leadership in such organizations is to manage mission drift and to reduce the ambiguity of the mission and organization goals.Social implicationsLitmus tests are proposed for identifying an authentic stewardship organization in contradistinction to those whose socially minded values are ancillary or a marketing ploy.Originality/valueThis is the first systematic attempt to characterize the stewardship organization. After providing three specific examples of such organizations, the contribution identifies key markers of bona fide stewardship organizations.

Three biomimetic flight control sensors

2014 ◽  
Vol 2 (1) ◽  
pp. 27-39 ◽  
Author(s):  
Javaan Chahl
Keyword(s):  
Optical Flow ◽  
Control Systems ◽  
Flight Control ◽  
Design Methodology ◽  
Urban Environments ◽  
Insect Vision ◽  
Content Type ◽  
Heading Control ◽  
First Time ◽  
Practical Implications

Purpose – Insects depend on the spatial, temporal and spectral distribution of light in the environment for navigation, collision avoidance and flight control. The principles of insect vision have been gradually revealed over the course of decades by biological scientists. The purpose of this paper is to report on bioinspired implementations and flight tests of these sensors and reflexes on unmanned aerial vehicles (UAVs). The devices are used for the stabilization of UAVs in attitude, heading and position. The implementations were developed to test the hypothesis that current understanding of insect optical flight control systems is feasible in real systems. Design/methodology/approach – Design was based on behavioral and anatomical studies of insects. The approach taken was to test the designs in flight on a UAV. Findings – The research showed that stabilization in attitude, heading and position is possible using the developed sensors. Practical implications – Partial alternatives to magnetic, inertial and GPS sensing have been demonstrated. Optical flow and polarization compassing are particularly relevant to flight in urban environments and in planetary exploration. Originality/value – For the first time the use of multispectral horizon sensing, polarization compassing and optical flow-based heading control have been demonstrated in flight.

High intergenerational connections: a film-based inquiry

2017 ◽  
Vol 40 (12) ◽  
pp. 1298-1315
Author(s):  
Anselmo Ferreira Vasconcelos
Keyword(s):  
Design Methodology ◽  
Interpersonal Skills ◽  
Real Life ◽  
Human Beings ◽  
Close Attention ◽  
Content Type ◽  
Intergenerational Connections ◽  
Film Method ◽  
Practical Implications

Purpose This study aims to increase the understanding about the concept of high-quality connections (HQCs) by examining how it develops between members of different generations. Design/methodology/approach It draws on film-based method to explain how the theory of HQC unfolds, particularly in a context of high intergenerational connection. Findings This study reflects the analysis of a movie that, to a large extent, fits in the HQCs conceptual framework. Rather, all key mechanisms of HQCs concept (i.e. behavioral, cognitive and emotional) were found in the plot of Die Hard 4.0. It provides compelling evidence that films may explore the possibilities of reality including the nuances of the relationships among human beings, despite the fact that it portrays a fictional creation. In doing so, it shows that HQCs are likely to be found – as very often happens in the real life – even in the worst situations. Findings also show that HQCs may be built through the time as individuals start to better know each other, i.e. their styles, behavior, religion preferences, held values, capabilities and interpersonal skills. Research limitations/implications Otherwise, film method does not allow that the research results be generalized. At best, it offers elements to the viewers reflect about. Practical implications Very often individuals are designated to carry out certain tasks along with unknown colleagues with whom they need to interact in a positive manner to accomplish the goals. As a result, organizations should pay close attention to the quality of connections among their employees. Originality/value To the best of the author’s knowledge, this is the first endeavor toward analyzing the mechanisms of HQCs concept by means of such approach. In doing so, this analysis strongly corroborates HQCs concept functioning.

How mindset and store familiarity impact online stockout responses

2020 ◽  
Vol 48 (4) ◽  
pp. 326-347
Author(s):  
Aneeshta Gunness ◽  
Harmen Oppewal
Keyword(s):  
Negative Affect ◽  
Design Methodology ◽  
Online Shopping ◽  
Negative Emotions ◽  
Marketing Strategies ◽  
Purchase Decisions ◽  
Close Attention ◽  
Content Type ◽  
Practical Implications

PurposeEffects of stockouts on purchase decisions have been examined from a variety of perspectives; little is yet known about how consumers react to stockouts in online shopping contexts. The present study investigates how stockout reactions depend on a consumer's mindset and familiarity with a website and investigates the role of negative affect in determining a consumer's stockout reaction.Design/methodology/approachShopping mindsets (deliberative vs. implemental) and website familiarity (high vs. low) were manipulated in an online experiment consisting of a simulated shopping task at an existing website which next was presented as having a stockout. The study observed the participants' switching responses and measured their negative affect.FindingsFindings indicate that when encountering an online stockout, consumers in an implemental mindset are more likely to switch away from the website than those in a deliberative mindset and are more likely to search for additional items at a competing site. Consumers who are more familiar with the website where they encounter the stockout display a higher likelihood of defecting to a competing site; however, when they are in an implemental mindset, their inclination to defect decreases. The study also shows that the strength of negative emotions affects OOS responses in that buyers that experience more negative emotions are more likely to defect from the site.Practical implicationsThe study's findings provide suggestions as to how retailers can manage and minimize defection behaviours associated with online stockouts. In designing operational and marketing strategies retailers need to pay close attention to how consumers' individual mindsets may vary by trait or circumstance and how they hence may respond differently to stockouts.Originality/valueThe authors introduce a novel perspective to the literature on stockout induced reactions and contribute by furthering investigation into previously unexplored specific consumer characteristics and intricacies of stockouts that drive particular stockout reactions.

Computational Fluid Dynamics Assisted Control System Design With Applications to Central Processing Unit Chip Cooling

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
R. Zhang ◽  
C. Zhang ◽  
J. Jiang
Keyword(s):  
Fluid Dynamics ◽  
Control System ◽  
Control Systems ◽  
Design Methodology ◽  
Cfd Simulation ◽  
Cooling System ◽  
Control System Design ◽  
Processing Unit ◽  
Central Processing ◽  
Chip Cooling

In this paper, a computational fluid dynamics (CFD) assisted control system design methodology has been described in detail. The entire design and evaluation procedure has been illustrated through a feedback control system synthesis for a central processing unit (CPU) chip cooling system. The design methodology starts with a full-scale CFD simulation of the nonlinear dynamic process to generate the input and output databases of the process. Using this data set, linear dynamic models around specified operating points are obtained using system identification techniques. Based on these models, one can design appropriate control systems to meet the required closed-loop control system specifications. To illustrate the effectiveness of this technique, it has been used to design a controller for a PC chip cooling system. In particular, the coupling issues between ‘real-time’ dynamic controllers with non real-time CFD simulation have been resolved. A physical experimental test bench based on a cooling system of a Pentium III CPU has been constructed. The feedback linear control systems designed by the proposed CFD approach have been evaluated experimentally for six CPU load conditions.

Stick or twist?

2018 ◽  
Vol 34 (10) ◽  
pp. 16-18
Keyword(s):  
Case Studies ◽  
Design Methodology ◽  
Reading Time ◽  
Close Attention ◽  
Wall Street ◽  
Content Type ◽  
Technology Changes ◽  
Pertinent Information ◽  
Practical Implications

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 The bulls and the bears of Wall Street pay close attention to merger and acquisition (M&A) activity in any given industry. A lot of consolidation in the marketplace shows that there may be one or two main horses that need to be backed, while a lack of activity may highlight long term decline. And some industries will differ as well. The entertainment industry has seen several major mergers over the years as there remains a belief that ‘content is king’, and therefore to acquire as much of it as possible is one way to remain successful as technology changes the way people access that content. 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.

scholarly journals An assessment of budgeting and budgetary controls among small and medium-sized enterprises: evidence from a developing economy

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mamorena Lucia Matsoso ◽  
Moses Nyathi ◽  
Franklin A. Nakpodia
Keyword(s):  
Control Systems ◽  
Goal Setting ◽  
Design Methodology ◽  
Positive Perception ◽  
Content Type ◽  
Economic Agents ◽  
Budgetary Control ◽  
Setting Theory ◽  
And Control ◽  
Practical Implications

PurposeThe capacity to plan, manage and control small and medium-sized enterprises (SMEs) is critical to realising their organisational goals. This paper assesses the effectiveness and perception of budgeting and budgetary control systems among SMEs.Design/methodology/approachRelying on the goal-setting theory (GST) and a methodology that accommodates questionnaires, data were collected from 170 manufacturing SMEs located in Cape Town, South Africa.FindingsResearch results affirm that the deployment of budgeting benefits from a positive perception of the value of budgeting and budgetary controls by key SME stakeholders. The study also finds that the perception of budgeting mirrors the level of education of SME operators, as educated respondents understand the value of implementing robust budgeting systems. Despite its focus on manufacturing SMEs, this study suggests that the manufacturing budget is the least utilised budgeting system among these organisations.Practical implicationsThe study reinforces the communication power of budgeting and budgetary controls as SMEs and economic agents are not only aware of corporate objectives but are equally incentivised to support the attainment of these objectives.Originality/valueDespite the extensive application of GST among scholars, its use in budgeting and budgetary control literature, particularly among SMEs in developing contexts, is limited. In line with GST, this study indicates that when agents establish and implement a plan, they are motivated to pursue and realise the set expectations while consistently evaluating themselves for improvement opportunities.

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