MERCon - 2022

Permanent URI for this collectionhttp://192.248.9.226/handle/123/18494

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Browsing MERCon - 2022 by Author "Amarasinghe, R"

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    Design and analysis of an aerodynamic structure for a ground and aerial vehicle
    (IEEE, 2022-07) Wijenayaka, RS; Bamunuge, R; Sameem, S; Amarasinghe, R; Samaraweera, N; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
    This paper proposes a novel hybrid approach for ground and aerial locomotion. Conceptual designs have been created for ground and aerial platforms and analyzed them separately. 3D models are optimized considering the practicality and ease of manufacturing. Mecanum wheels have been integrated with the ground platform to enable multidirectional locomotion. Thrust vector system has been added to quad rotor aerial platform to increase the forward propulsion. Mathematical models are generated and simulated to visualize the motion virtually and to derive torque requirement to select suitable actuator components. FEA (Finite Element Analysis) analysis proved the proposed platform can withstand the predefined load conditions (10kg) with a good safety factor of 5.9. Combined platforms have been subjected to CFD (Computational Fluid Dynamics) analysis and it has been proved that platform lift force is significantly increased (by 3.5N) compared to traditional quad rotor configuration due to the aerodynamic body.
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    Numerical study to investigate the pressure propagation patterns by a compression sleeve with miniaturised air-bladders
    (IEEE, 2022-07) Hedigalla, D; Ehelagasthenna, M; Nissanka, ID; Amarasinghe, R; Nandasiri, GK; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
    Chronic venous disease (CVD), the most prevalent vascular disease affecting to the lower extremities, is regarded as any functional or morphological abnormalities of the venous system. Compression therapy, either active or passive is currently regarded as the cornerstone of treatment for all CVD related complications. However, most of the existing textile solutions have major limitations of applying uniform pressure around the lower limb circumference which was overcome by applying a radial force in response to the pressure exerted by an air volume trapped inside a miniature bladder. Hence, this article used numerical simulations to investigate the propagation of pressure on the skin, fat and muscle layers applied by hexagonal shaped mini-bladders. The results of this study revealed that 40% of internal pressure of the bladders successfully transmitted through the skin layer, and a slight increase of pressure was recorded along the thickness of skin layer while it was decreased in fat and muscle layers. Moreover, the highest percentage of pressure drop was recorded along the muscle layer.