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Article
Publication date: 7 March 2023

Metin Uzun and Tugrul Oktay

The purpose of this paper is to improve autonomous flight performance of an unmanned aerial vehicle (UAV) having actively sweep angle morphing wing using simultaneous UAV and…

Abstract

Purpose

The purpose of this paper is to improve autonomous flight performance of an unmanned aerial vehicle (UAV) having actively sweep angle morphing wing using simultaneous UAV and flight control system (FCS) design.

Design/methodology/approach

An UAV is remanufactured in the ISTE Unmanned Aerial Vehicle Laboratory. Its wing sweep angle can vary actively during flight. FCS parameters and wing sweep angle are simultaneously designed to optimize autonomous flight performance index using a stochastic optimization method called as simultaneous perturbation stochastic approximation (SPSA). Results obtained are applied for flight simulations.

Findings

Using simultaneous design process of an UAV having actively sweep angle morphing wing and FCS design, autonomous flight performance index is maximized.

Research limitations/implications

Authorization of Directorate General of Civil Aviation in Turkey is crucial for real-time UAV flights.

Practical implications

Simultaneous UAV having actively sweep angle morphing wing and FCS design process is so beneficial for recovering UAV autonomous flight performance index.

Social implications

Simultaneous UAV having actively sweep angle morphing wing and FCS design process achieves confidence, high autonomous performance index and simple service demands of UAV operators.

Originality/value

Composing a novel approach to improve autonomous flight performance index (e.g. less settling and rise time, less overshoot meanwhile trajectory tracking) of an UAV and creating an original procedure carrying out simultaneous UAV having actively sweep angle morphing wing and FCS design idea.

Details

Aircraft Engineering and Aerospace Technology, vol. 95 no. 7
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 1 October 1994

Delavar G. Shenas and Sepehr Derakhshan

Discusses the advent of simultaneous engineering as the newmanufacturing paradigm, and speculates about the organizationalconsequences of this new manufacturing method. To…

851

Abstract

Discusses the advent of simultaneous engineering as the new manufacturing paradigm, and speculates about the organizational consequences of this new manufacturing method. To decrease the time from product inspection through prototype manufacture, it is necessary to instil a knowledge of process capabilities into the design process. Simultaneous engineering stresses design of product and production process together with design of assembly, quality control, and field service, that is the complete production cycle. There are many ways that a product can be designed to allow simplification of the product manufacture. This new method has necessitated new forms of internal organization of the company through blurring between different divisions of a company and the creation of multifunctional teams composed of domain experts from every stage of production. This new manufacturing mode has also redefined the relationship between the companies and their vendors. Because of greater technological interdependence, and even without any formal ties, concludes that long‐term relationships are becoming more and more important in many industries.

Details

International Journal of Operations & Production Management, vol. 14 no. 10
Type: Research Article
ISSN: 0144-3577

Keywords

Article
Publication date: 30 July 2019

Sezer Çoban

The purpose of this paper is to rise the autonomous flight performance of the small unmanned aerial vehicle (UAV) using simultaneous tailplane of UAV and autopilot system design.

Abstract

Purpose

The purpose of this paper is to rise the autonomous flight performance of the small unmanned aerial vehicle (UAV) using simultaneous tailplane of UAV and autopilot system design.

Design/methodology/approach

A small UAV is remanufactured in the UAV laboratory. Its tailplane can be changed before the flight. Autopilot parameters and some parameters of tailplane are instantaneously designed to maximize autonomous flight performance using a stochastic optimization method. Results found are applied for simulations.

Findings

Benefitting simultaneous tailplane of UAV and autopilot system design process, autonomous flight performance is maximized.

Research limitations/implications

Authorization of Directorate General of Civil Aviation in Turkey is required for UAV flights.

Practical implications

Simultaneous tailplane and autopilot system design process is so useful for refining UAV autonomous flight performance.

Social implications

Simultaneous tailplane and autopilot system design process fulfills confidence, high autonomous performance, and easy service demands of UAV users. By that way, UAV users will be able to use better UAVs.

Originality/value

Creating a novel technique to recover autonomous flight performance (e.g. less overshoot, less settling time and less rise time during trajectory tracking) of UAV and developing a novel procedure performing simultaneous tailplane of UAV and autopilot system design idea.

Details

Aircraft Engineering and Aerospace Technology, vol. 91 no. 10
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 13 June 2022

Firat Sal

This paper aims to offer a simultaneous design approach for helicopter having swept anhedral blade tip shape and helicopter flight control system (HFCS) to minimize controller…

Abstract

Purpose

This paper aims to offer a simultaneous design approach for helicopter having swept anhedral blade tip shape and helicopter flight control system (HFCS) to minimize controller cost.

Design/methodology/approach

By considering previously stated offer, control-oriented models and a stochastic optimization method are applied to minimize controller cost of the HFCS.

Findings

Using simultaneous design approach for helicopters having blade tip swept and blade tip anhedral causes considerably less control effort than the helicopters not benefiting this related design approach.

Practical implications

Simultaneous design approach for helicopters having blade tip swept and blade tip anhedral is applicable to consider fuel economy.

Originality/value

One important novelty of this paper is using simultaneous approach for determining optimum shape of blade tip swept and anhedral. Another considerable novelty of this paper is also using a stochastic optimization method called simultaneous perturbation stochastic approximation for previously mentioned purpose. In this paper, it is also reached that using simultaneous design approach for swept anhedral helicopter blade tip shape and HFCS causes less control effort than the helicopters not using this approach. This leads to less fuel consumption and green environment.

Details

Aircraft Engineering and Aerospace Technology, vol. 95 no. 1
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 1 June 1991

Alberto De Toni and Luca Zipponi

An interpretative chart is proposed on several levels, which on theone hand acts as a key to the actions aimed at revision of simultaneousdesign criteria, and on the other is a…

1320

Abstract

An interpretative chart is proposed on several levels, which on the one hand acts as a key to the actions aimed at revision of simultaneous design criteria, and on the other is a methodological indication of how to articulate simultaneous actions on the product and the process. For each level the action levers and objectives are further described in an attempt to distinguish both single and multiple lever‐objective relationships. Finally, ways of carrying out simultaneous actions on the product and the process, together with the problems involved are discussed.

Details

International Journal of Operations & Production Management, vol. 11 no. 6
Type: Research Article
ISSN: 0144-3577

Keywords

Article
Publication date: 24 January 2018

Dominic Thomas, Douglas Olsen and Kyle Murray

A key finding in the affect integration literature is that for a sequence of events that unfolds sequentially, individuals attend to specific aspects of these events, such as the…

Abstract

Purpose

A key finding in the affect integration literature is that for a sequence of events that unfolds sequentially, individuals attend to specific aspects of these events, such as the spread, peak, end, or trend. Due to recent findings of deviations from the peak-end rule, this study closely examines the integration processes of affective events presented sequentially and simultaneously.

Design/methodology/approach

Three experimental studies were conducted. Study 1a (financial dashboard) and Study 1b (charity advertisement) examine consumers’ overall evaluation for a sequence of mixed affective events. Using eye trackers, Study 2 examines individuals’ attention to particular affective moments presented sequentially and simultaneously.

Findings

The present research provides additional support for the peak–end rule for the sequential presentation of mixed-valence affective events. However, in the simultaneous mode of presentation, the flexibility to view various affective events decreases the disproportionate weights given to specific events, a divergence from the peak–end rule.

Research limitations/implications

Although the tempering effect of simultaneous presentation can be concluded, further studies are required to discern how individuals process these events and develop a predictive rule.

Practical implications

The results of the present study provide clear and actionable directions for application developers and advertising agencies: when communicating information or developing an advertisement, consideration should be given to how each affective event is being communicated.

Originality/value

It is argued that in the simultaneous mode of presentation, the flexibility to view various affective events allows greater shifts in attention that increase the salience of interconnections and thereby decrease the disproportionate weights given to specific events.

Details

European Journal of Marketing, vol. 52 no. 3/4
Type: Research Article
ISSN: 0309-0566

Keywords

Article
Publication date: 26 January 2022

Hani Gilani, Sahar Shobeiry, Mohammad Biglari Kami and Hadi Sahebi

A sustainable selection method for facility location of the water treatment is formulated by best–worst method. In addition, the model addresses the selection of appropriate…

Abstract

Purpose

A sustainable selection method for facility location of the water treatment is formulated by best–worst method. In addition, the model addresses the selection of appropriate technologies in the treatment plant, management of water leakage in the whole transmission network by using modernization and selection of different transmission technologies. Finally, the interaction between water and energy in this network seems to be paying particular attention.

Design/methodology/approach

Rapid population growth and urban development, and the constraints of water supply have become one of the crucial challenges around the world in the 21st century. Hence, the use of refined urban wastewater is increasing in many countries as an alternative source of water. In this regard, the rehabilitation of urban wastewater recycling and reuse has been proposed as one of the most suitable solutions for urban water management. Hence, in this paper, a mathematical model is formulated to design the simultaneous marketing of the urban water distribution network and wastewater treatment (including).

Findings

It seeks to ensure that energy is supplied through chemical methods to ensure that the system's energy dependence is on the national electricity grid. And in order to validate the model, a case study has been studied. By analyzing the results, it can be concluded that the upgrading of sewage treatment plants to replace underground water and water from nearby dams in household, agricultural and industrial applications will have positive environmental and economic impacts. One of the notable environmental impacts is the decline in groundwater and water scarcity in the coming years.

Originality/value

The summary of contributions is presented follow as: design and planning of water and urban wastewater integrated network; sustainable selection of facility location for the water treatment; capability selecting different treatment technologies in simultaneous design water and urban sewage supply chain; managing water leak in the network; proposed a water–energy nexus model in simultaneous design water and urban sewage supply chain; studying the feasibility of construction of power plants from biogas, the resulting of anaerobic digestion in treatment centers.

Article
Publication date: 11 June 2020

Oguz Kose and Tugrul Oktay

The purpose of this paper is to design a quadrotor with collective morphing using the simultaneous perturbation stochastic approximation (SPSA) optimization algorithm.

Abstract

Purpose

The purpose of this paper is to design a quadrotor with collective morphing using the simultaneous perturbation stochastic approximation (SPSA) optimization algorithm.

Design/methodology/approach

Quadrotor design is made by using Solidworks drawing program and some mathematical performance relations. Modelling and simulation are performed in Matlab/Simulink program by using the state space model approaches with the parameters mostly taken from Solidworks. Proportional integral derivative (PID) approach is used as control technique. Morphing amount and the best PID coefficients are determined by using SPSA algorithm.

Findings

By using SPSA algorithm, the amount of morphing and the best PID coefficients are determined, and the quadrotor longitudinal and lateral flights are made most stable via morphing.

Research limitations/implications

It takes quite a long time to model the quadrotor in Solidworks and Matlab/Simulink with the state space model and using the SPSA algorithm. However, this situation is overcome with the proposed model.

Practical implications

Optimization with SPSA is very useful in determining the amount of morphing and PID coefficients for quadrotors.

Social implications

SPSA optimization method is useful in terms of cost, time and practicality.

Originality/value

It is released to improve performance with morphing, to determine morphing rate with SPSA algorithm and to determine PID coefficients accordingly.

Details

Aircraft Engineering and Aerospace Technology, vol. 92 no. 7
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 7 June 2011

Rudrajeet Pal and Håkan Torstensson

Concurrent designing of products, processes and supply chains (three‐dimensional concurrent engineering (3‐DCE)) has proved to be beneficial in rendering holistic…

3296

Abstract

Purpose

Concurrent designing of products, processes and supply chains (three‐dimensional concurrent engineering (3‐DCE)) has proved to be beneficial in rendering holistic, market‐responsive architecture to organizations through linkages created by dynamic capability development and innovation. The purpose of this paper is to investigate the promises of 3‐DCE in synthesizing and sustaining critical success factors (CSFs) for organizations, and also to underpin the existing gap between its offerings in devising the CSFs and the “real solutions” essential in a dynamic system's perspective.

Design/methodology/approach

The paper adopts an intermediary approach combining both explanatory and exploratory researches. The conceptual framework of the paper is based on a matrix for organizational mapping of textile, clothing and fashion (TCF) firms prepared through content analysis. This is followed by an extensive semi‐structured survey. The selection of firms was based on contacting TEKO and Europages. Usable responses were obtained from 42 firms for detailed analysis, making the response rate around 15 percent.

Findings

The results were manifold. It showed that most of the key success factors are synthesized and sustained through 3‐DCE designing. The paper also highlights the necessity of incorporating intangible value propositions of culture, leadership and governance, knowledge, image and relationship into the 3‐DCE model to generate an “extended 3‐DCE” framework for mediating operational performance and hence organizational success. Such a model required in a dynamic environment is argued to show a fit to represent a design for resilience perspective, requiring further research.

Research limitations/implications

First, the selection of sample size of organizations was small and arguments regarding its representation of the Swedish TCF firms' population could be raised. So the claims and propositions of the paper cannot be widely generalized. Second, the responses to the survey were based on judgments of the company top management and could vary if intra‐organizational responses were considered.

Practical implications

The findings from the paper can be beneficial for organizations to understand the key areas in which to invest and how to invest their resources and time, as CSF identification is largely qualitative and can result in differing opinions in pinpointing them. It is thus recommended to synthesize or identify them from the 3‐DCE perspective.

Originality/value

The paper is original in realizing how 3‐DCE can be instrumental in devising CSFs in organizations and also what factors needs to be incorporated into its “extended” framework to match the requirements for organizations in a dynamic environment.

Details

Business Process Management Journal, vol. 17 no. 3
Type: Research Article
ISSN: 1463-7154

Keywords

Article
Publication date: 22 September 2023

Oguz Kose, Tugrul Oktay and Enes Özen

The purpose of this paper is to obtain values that stabilize the lateral and longitudinal flight of the quadrotor for which the morphing amount and the best…

Abstract

Purpose

The purpose of this paper is to obtain values that stabilize the lateral and longitudinal flight of the quadrotor for which the morphing amount and the best Proportional-Integral-Derivative (PID) coefficients are determined by using the simultaneous perturbation stochastic approximation (SPSA) optimization algorithm.

Design/methodology/approach

Quadrotor consists of body and arms; there are propellers at the ends of the arms to take off and rotors that rotate them. By reducing the angle between mechanism 1 and the rotors with the horizontal plane, the angle between mechanism 2 and the arms, the rotors rise and different configurations are obtained. Conventional multi-rotor aircraft has a fixed fuselage and does not need a tail rotor to change course as helicopters do. The translational and rotational movements are provided by the rotation of the rotors of the aircraft at different speeds by creating moments about the geometric center in 6-degree-of-freedom (DOF) space. These commands sent from the ground are provided by the flight control board in the aircraft. The longitudinal and lateral flight stability and properties of different configurations evaluated by dynamic analysis and simulations in 6 DOF spaces are investigated. An algorithm and PID controller are being developed using SPSA to achieve in-flight position and attitude control of an active deformable aircraft. The results are compared with the results of the literature review and the results of the previous article.

Findings

With SPSA, the best PID coefficients were obtained in case of morphing.

Research limitations/implications

The effects of quadrotor arm height and hub angle changes affect flight stability. With the SPSA optimization method presented in this study, the attitude is quickly stabilized.

Practical implications

With the optimization method, the most suitable PID coefficients and angle values for the lateral and longitudinal flight stability of the quadrotor are obtained.

Social implications

The transition rate and PID coefficients are determined by using the optimization method, which is advantageous in terms of cost and practicality.

Originality/value

With the proposed method, the aircraft can change shape to adapt to different environments, and the parameters required for more stable flight for each situation will be calculated, and this will be obtained more quickly and safely with the SPSA optimization method.

Details

Aircraft Engineering and Aerospace Technology, vol. 95 no. 10
Type: Research Article
ISSN: 1748-8842

Keywords

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