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Article
Publication date: 30 August 2022

Ivan Kostić, Dragoljub Tanović, Olivera Kostić, Ahmed Ali Irhayim Abubaker and Aleksandar Simonović

Unmanned aerial vehicles (UAV) with remote and/or automated flight and mission controls have replaced airplanes with pilots in many important roles. This study aims to deal with…

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Abstract

Purpose

Unmanned aerial vehicles (UAV) with remote and/or automated flight and mission controls have replaced airplanes with pilots in many important roles. This study aims to deal with computational fluid dynamics (CFD) analysis and development of the aerodynamic configuration of a multi-purpose UAV for low and medium altitudes. The main aerodynamic requirement was the application of the tandem wing (TW) concept, where both wings generate a positive lift and act as primary lifting devices.

Design/methodology/approach

Initial design analyses of the UAV’s aerodynamic configuration were performed using ANSYS Fluent. In previous work in Fluent, the authors established a calculation model that has been verified by experiments and, with minor adjustments, could be applied for subsonic, transonic and supersonic flow analyses.

Findings

The design evolved through eight development configurations, where the latest V8 satisfied all the posted longitudinal aerodynamic requirements. Both wings generate a substantial amount of positive lift, whereas the initial stall occurs first on the front wing, generating a natural nose-down stall recovery tendency. In the cruising flight regime, this configuration has the desired range of longitudinal static stability and its centre of pressure is in close proximity to the centre of gravity.

Practical implications

The intermediate development version V8 with proper longitudinal aerodynamic characteristics presents a good starting point for future development steps that will involve the optimization of lateral-directional aerodynamics.

Originality/value

Using contemporary CFD tools, a novel and original TW aerodynamic configuration have evolved within eight development stages, not being based on or derived from any existing designs.

Details

Aircraft Engineering and Aerospace Technology, vol. 95 no. 3
Type: Research Article
ISSN: 1748-8842

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Book part
Publication date: 2 September 2024

Nikola Ćurčić, Aleksandar Grubor and Vuk Miletić

Human resources (HR) are undoubtedly one of the most important factors of any organization. That is why making decisions on the HR policy is becoming a very sensitive issue, both…

Abstract

Human resources (HR) are undoubtedly one of the most important factors of any organization. That is why making decisions on the HR policy is becoming a very sensitive issue, both when hiring adequate candidates for the job and during the process work, i.e., during training and development of employees who work in the organization. The purpose of this study was to investigate the importance of HR and decisions on the HR policy as the premise for generating the organization’s expected business excellence. The starting assumption of this chapter is that appropriate decisions on the HR policy are predictors of engaging adequate employees and managing their potentials on the right way. The research is directed toward identifying differences in decisions on the personnel policy in organizations from Serbia that have different decision-makers and different management styles, which are directly related to their business success. Apart from the decision-maker, a significant role in profiling an organization’s personnel should also be done by the Human Resource Department, who take part in recruiting, selecting for education, building, and motivating personnel. In order to confirm the starting assumption, the comparative analysis method, the synthesis method, and the multiple comparison and statistical test methods are used.

Details

Emerging Patterns and Behaviors in a Green Resilient Economy
Type: Book
ISBN: 978-1-83549-781-4

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