Hakan Ülker, Cemal Baykara and Can Özsoy
A fixed wing unmanned aerial vehicle (FWUAV) is targeted to perform processor in the loop (PIL) simulations for the flight scenarios such as straight and level, level climb, level…
Abstract
Purpose
A fixed wing unmanned aerial vehicle (FWUAV) is targeted to perform processor in the loop (PIL) simulations for the flight scenarios such as straight and level, level climb, level turn, climbing turn and level steady heading sideslip under windy conditions such as steady wind (SW) and wind gust (WG) in a desired and controlled manner.
Design/methodology/approach
The constrained multi-input–multi-output (MIMO) lateral and longitudinal linear models-based model predictive controllers (MPCs) which are proposed in a previous study (Ulker et al., 2017) are tested in the PIL simulations under specified windy conditions. BeagleBone Black Rev C is used as a target hardware or processor in the PIL simulations.
Findings
The results of the PIL simulations show that the MPCs proposed in the previous study can achieve satisfactory performance and flying qualities for the all flight scenarios handled in this paper under windy conditions.
Practical implications
The MPCs proposed in the previous study can be easily implemented in the real world to a low-cost and small-sized board like BeagleBone Black Rev C which is used in this paper.
Originality/value
The proposed MPCs in the previous study which are capable of providing more flexibility in terms of tracking complex trajectories are showed to be able to be implemented to real system by means of PIL simulations under the changeable windy conditions which are difficult for performance tests.
Details
Keywords
Hakan Ülker, Cemal Baykara and Can Özsoy
The purpose of the paper is to examine a fixed wing unmanned aerial vehicle (UAV) as it undergoes five flight scenarios under straight and level, level climb, level turn, climbing…
Abstract
Purpose
The purpose of the paper is to examine a fixed wing unmanned aerial vehicle (UAV) as it undergoes five flight scenarios under straight and level, level climb, level turn, climbing turn and level steady heading sideslip conditions in a desired and controlled manner using constrained multi input multi output (MIMO) model predictive controllers (MPCs).
Design/methodology/approach
An MPC strategy based on the lateral and longitudinal linear models is proposed for the flight control design. Simulations are carried out for the nonlinear closed-loop aircraft Simulink model available from the University of Minnesota UAV research group with the implemented MIMO MPCs designed in this paper.
Findings
The results of the simulations show that the MIMO MPCs can achieve satisfactory performance and flying qualities under three different test conditions in terms of existing unmeasured outputs and unmeasured output disturbances.
Practical Implications
The MPCs designed in this paper can be implemented to UAVs. Therefore, the implementation is considered as an advanced research.
Originality/value
The proposed MPC design in this paper provides more flexibility in terms of tracking complex trajectories comparing with the classical controllers in the literature. Besides they provide to change more than one reference of the states at any time.
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Gullu Gencer, Hakan Atay, Arzu Gurdogan and Ulker Colakoglu
This study aims to measure the effect of organizational culture perceptions of hotel employees on their organizational silence behavior and job performance, as well as the effect…
Abstract
Purpose
This study aims to measure the effect of organizational culture perceptions of hotel employees on their organizational silence behavior and job performance, as well as the effect of their organizational silence behavior on their job performance.
Design/methodology/approach
A correlational survey model was used in this research and a questionnaire was distributed to collect the data from 389 sampled employees working in four- and five-star hotels in the Kusadasi region in Turkey.
Findings
It was found that organizational culture was not significantly related to organizational silence but that organizational culture and its dimensions were significantly related to job performance. It was also revealed that while organizational silence was not significantly related to job performance, its dimensions were significantly related to job performance.
Practical implications
The results of this study provide insight into organizational culture as an important factor in increasing job performance. The study also revealed how organizational silence behavior and its dimensions affect job performance. In this sense, accommodation establishments will be able to acquire new perspectives in terms of improving job performance.
Originality/value
This paper is deemed important, as it examined these three terms in one model in the field of tourism management. It is thought that it will contribute to the literature by closing the gap in the tourism literature while leading the way for future studies.
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Keywords
Mohsen Javanmard, Mohammad Hasan Taheri, Nematollah Askari, Hakan F. Öztop and Nidal Abu-Hamdeh
The purpose of this paper is to investigate the hydromagnetic third-grade non-Newtonian fluid flow and heat transfer between two coaxial pipes with a variable radius ratio.
Abstract
Purpose
The purpose of this paper is to investigate the hydromagnetic third-grade non-Newtonian fluid flow and heat transfer between two coaxial pipes with a variable radius ratio.
Design/methodology/approach
To solve the approximate nonlinear and linear problems with variable coefficients, a trial function was applied. Methods include collocation, least square and Galerkin that can be applied for obtaining these coefficients.
Findings
It is revealed that an increase of the non-Newtonian parameter, Hartmann number, and radius ratio leads to an augmentation of the absolute value of the dimensionless velocity, temperature, velocity gradient, and temperature gradient of about 10-60%. Further, the augmentation of Bi1 reduces the absolute value of the dimensionless temperature profile and dimensionless temperature gradient about three to four times; hence, the dimensionless heat transfer rate reduces. However, the growth of Bi2 has a contrary impact. Besides, the increase of Pr and Ec leads to an increase in the dimensionless temperature profile and dimensionless temperature gradient; therefore, the dimensionless heat transfer rate increases.
Originality/value
The convection heat transfer on the walls of the pipes is considered, and the nonlinear coupled momentum and energy equations are solved using the least squared method and collocation methods, respectively.
Details
Keywords
Efe Ünsal, Sanem Kaptanoğlu and Hayat Kabasakal
The learning outcomes are as follows. First, female managers can face gender inequity in different forms, such as the glass ceiling and glass cliff, while they run for leadership…
Abstract
Learning outcomes
The learning outcomes are as follows. First, female managers can face gender inequity in different forms, such as the glass ceiling and glass cliff, while they run for leadership positions, especially in male-dominated business contexts. Second, managers can show high performance and be effective leaders as long as they are aware of that all managers are evaluated according to a wide variety of criteria, and play many different managerial roles, such as interpersonal, informational and decisional roles. Finally, managers should pay attention to all stakeholders’ demands in decision-making process for sustainability and performing better in the long run.
Case overview/synopsis
Since football began gaining popularity in Turkey at the dawn of the 20th century, the sport remains the most popular national sport today. However, recently, a new name has shaken the world of Turkish football: Berna Gozbasi, the first female football manager in Turkish history. In the middle of 2019–2020 football season, Gozbasi became the first female club president after she assumed leadership of Kayserispor. Kayserispor was officially founded as a Turkish professional football club in 1966, and, as its name suggests, was based in Kayseri, a sizeable industrialised city located in Central Anatolia. The team competes in the “Turkish Super League”, Turkey’s top football competition. In this case, to discuss gender inequity, leadership, and management in the sport context, the authors explained the dilemma Gozbasi faced while she decided whether or not to accept this challenging role. Then, the authors examined the experiences she gained as a leader and the dilemma she faced to diminish the negative impact of the COVID-19 pandemic on the organisation she led.
Complexity academic level
Undergraduate and MBA students.
Supplementary materials
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Subject code
CSS 6: Human Resource Management.