Research Article
IAR-99 HAWK Flutter Model Studies with External Stores
Issue:
Volume 9, Issue 1, June 2025
Pages:
1-13
Received:
17 December 2024
Accepted:
5 January 2025
Published:
22 January 2025
Abstract: The new Finite Elements Model (FEM) allows the visualization of the results and the study of the behavior of the structure at the local level (frames; lises; spars; frame-body, shell-body and longeron-body interaction) in the case of global dynamical phenomena. After creating FEM of the aircraft IAR-99 HAWK in the empty equipped configuration using special elements, the team decided to extend the study of flutter to aircraft in different external stores configurations. The results of the theoretical free-free vibrations obtained for the IAR-99 HAWK in different external stores configurations are presented and compared to those obtained from ground tests, thus confirming the accuracy of the new Finite Element Model (FEM). The aerodynamic idealization of the IAR-99 HAWK in external stores configurations aircraft was made using the Doublet Lattice Method (DLM) for subsonic flow, also considering the load-bearing wing/fuselage/pylon/store interference and aims to determine the generalized aerodynamic forces. The flutter calculation for the IAR-99 HAWK in external stores configurations aircraft, was made using the p-K methodology presented in the MSC. Nastran program, using the vibration modes obtained on the basis of the new finite element model and the matrix of generalized aerodynamic forces in subsonic flow. The V-g curves drawn lead us to flutter speeds outside the safety margin related to the maneuvering diagram, according to the regulations in force, both in the case of the plane in smooth configuration and the plane in the selected external storers variants.
Abstract: The new Finite Elements Model (FEM) allows the visualization of the results and the study of the behavior of the structure at the local level (frames; lises; spars; frame-body, shell-body and longeron-body interaction) in the case of global dynamical phenomena. After creating FEM of the aircraft IAR-99 HAWK in the empty equipped configuration using...
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Research Article
The Sustainability of Water Access Services in Mozambique: From Policy to Practice
Alves Nhaurire*
,
Rehana Capurchande
Issue:
Volume 9, Issue 1, June 2025
Pages:
14-26
Received:
18 February 2025
Accepted:
6 March 2025
Published:
21 March 2025
Abstract: The access to water services is deficient in Mozambique, with only a little more than half of the population having access to this service. Investments have been made on the one hand in terms of construction and rehabilitation of new water sources and supply systems, and on the other hand in terms of elaboration of a legal and institutional framework that "favors" greater dynamism in the sector. In this paper, we seek to analyze the framework of policies and strategies institutionally designed to ensure sustainable access to water services in Mozambique. That is, to analyze the process of implementation of water policies in Mozambique, seeking to understand the relationship between theory and practice. This paper is part of a qualitative study based on phenomenological principles. Field work was carried out in Gaza province, Mozambique, alongside document analysis of the main policies and strategies of the water sector in Mozambique, and interviews with key informants in the sector. The study revealed that in theory, the availability of a legal framework and the existence of institutions at various levels may indicate that the foundations for sustainable access to water services are in place. However, the challenge lies in its operationalization. District governments have a weak grasp of the legal framework, and insufficient technical and financial capacities for its operationalization.
Abstract: The access to water services is deficient in Mozambique, with only a little more than half of the population having access to this service. Investments have been made on the one hand in terms of construction and rehabilitation of new water sources and supply systems, and on the other hand in terms of elaboration of a legal and institutional framewo...
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