https://ir.kdu.ac.lk/handle/345/3882 Tue, 21 Apr 2026 20:58:08 GMT 2026-04-21T20:58:08Z https://ir.kdu.ac.lk/handle/345/3680 Conceptual Design of Boom Mounted Inverted V-Tail in the Searcher MK II UAV Khadka, Sushil; Abeygoonewardene, JI; Liyanage, NP Abstract: Long endurance surveillance drones are preferred in both military and meteorological applications. Designers aim to enhance vehicle aerodynamics in view of increasing endurance by introducing methods of drag reduction. This research aims to enhance the performance of an existing UAV widely used in Sri Lanka for surveillance, reconnaissance and other military operations. The UAV is propelled by a pusher type propeller, behind which lies a twin boom mounted H-tail for the stability. The propeller wake from the propeller creates a continuous turbulent flow on the tail surface resulting in higher profile drag. A design is proposed to replace the tail section with inverted V-tail configuration with sufficient clearance from the immediate propeller wake. The new design resulted in a reduction of approximately 21% in total wetted area. CFD simulations were carried out to analyse aerodynamic parameters of the reconfigured aircraft, where 18.69% reduction in drag was observed. The static longitudinal static stability is assessed and found to be within acceptable limits. The final design shows a significant improvement in the performance of the aircraft in terms of range and endurance. Wed, 01 Jan 2020 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/3680 2020-01-01T00:00:00Z https://ir.kdu.ac.lk/handle/345/2984 Controlling Parked Vehicle Interior Temperature Using Renewable Energy Gunasekara, WKV; Farmis, Fa; Gayantha, KAK; Bandara, RMPS; Athukorala, SAAAK; Rathnayake, MP A parked vehicle cabin can be treated as a nearly closed volume. So, when an automobile is parked under sunlight the solar radiation heats the interior to extensive temperatures of above 60°C. These extreme temperatures reduce the cabin thermal comfort of the occupants, especially until the automobile’s in-built cooling system brings the temperature to a comfortable level. The extreme temperatures in the cabin have also led to several heatstroke victims and even deaths of occupants in parked automobiles. These extreme conditions also degrade cabin materials. This research focuses on developing partly portable cooling equipment based on the vapor compression refrigerant cycle that is powered by solar energy for a car cabin. The equipment was sized for a Suzuki Wagon R – 2015 automobile, based on the local heat loads that were gained in this research. Also, two Computer simulations were done to determine the cabin conditions with and without the designed equipment. Further verifications of these results were done by testing a prototype of the design. The results from computer simulations and test results both confirm the reduction in cabin temperature to below 44°C. Further developments are necessary for this model to make the parked car cabin completely safe for occupants. With the current results gained using the prototype developed, the car cabin thermal comfort has increased by a huge margin, where the temperature has reduced from above 60°C to below 44°C. This paper focuses on the simulation segment of the research conducted. Wed, 01 Jan 2020 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/2984 2020-01-01T00:00:00Z https://ir.kdu.ac.lk/handle/345/2982 Waste Minimization for Small Airlines by Using Safety Management System Concepts Nissanka, NBAP; Liyanage, SDRT; Rodrigo, WTS The detrimental effect of the aviation industry comes with its environmental damage, which has inevitably yet significantly increased over the years. Much research is conducted on demoting the environmental damage caused through air pollution, sound pollution, waste pollution, and hydrological pollution. This research aims to focus on developing a system that may reduce and moderate the waste production by the prevention of waste production, which can be done by amplifying a waste management system using scientific methodology and the minimization of waste production through waste type formation reduction. The concepts of safety management due to its inherent qualities of a comprehensive system Top to the bottom management system, a total study of safety in all aspects, has the ability to continuously improve. Furthermore, the organizational commitment from the top management to the bottom is substantial. As in the rest of the world, the aviation industry of Sri Lanka is also mounting at a rapid speed. This research was conducted as a case study of a small aviation industry organization. However, the waste management process of the Sri Lankan aviation organizations has not been given proper consideration to mitigate or prevent the immense waste production. In numerous research studies that have been conducted, the method for managing certain types of waste produced by aviation organizations was discussed. Henceforth, further research developed a waste management system that includes four annexes that can be used for the prevention and minimization of all types of waste produced by the aviation organizations in Sri Lanka. Wed, 01 Jan 2020 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/2982 2020-01-01T00:00:00Z https://ir.kdu.ac.lk/handle/345/2980 Evaluating the Efficiency of a Traffic Signal Light over a Traffic Policeman Dias, TWKIM; Ekanayake, NHARS The overall effect of traffic is considered to be high, at most of the intersections when they are controlled by traffic signal lights during peak hours . This causes lengthy queues and user inconveniences at intersections. Traffic police officers also control some of the intersections during peak hours in order to reduce this queue length and waiting time. The objectives of this research were to determine the relationship between the queue length formed and vehicular delay at peak hours, when the intersection is controlled by traffic signal lights and traffic policemen. Data was collected in two four-way intersections at Kanatta road / Dudley Senanayake Mawatha and Golumadama intersection. When the queue length was considered by 5-minute time intervals, the number of vehicles in the queue were higher with traffic signal control, compared to police controlled intersection. Further, per signal cycle queues were also counted in the said two scenarios. The observed values were furthers tested using Contingency Table analysis (Chi-square test) to assess whether the effect is statistically significance. Results showed that, queue lengths and the number of waiting hours were higher when the intersection was controlled by traffic signal lights compared to a traffic policeman. However, per cycle waiting time was significantly higher when controlled by policemen. Therefore, when a single-user point of view, the intersection delay may seem higher when controlled by a traffic policeman. However, the overall delay at the intersection is lesser with the police control. Wed, 01 Jan 2020 00:00:00 GMT https://ir.kdu.ac.lk/handle/345/2980 2020-01-01T00:00:00Z