Drone Design and Construction for Indoor Inspection Scenarios
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The need for using drones for indoor inspection scenarios is sought after. The benefits of reducing both time and risk are to big to not pursue a solution. This project has proven that a functional drone prototype for indoor inspection scenarios can been build. It has features that lets the camera perform inspections of walls and ceilings. It also has motorarms with the possibilities to mount connections for different collision avoidance radars to them. All things considered, the final prototype has the features necessary for indoor inspections that modern drones on the marked today lack. During the process two prototypes were built. They are both the same design, but one is scaled down making it 25% smaller and 35% lighter. Because both designs focus on having desired features for an indoor inspection scenario, modifications were made such as flipping the front motors to create space for components on top of the drone. It was also split into two levels, letting us place the battery closer to the center of gravity for a longer endurance. The first prototype focused on being a 2−2,5kg class drone. It uses T-Motor s MN3510 KV700 motors together with 12" propellers which makes the size 455 mm wide. The smaller design focused on taking the same design but making it as small as possible for a given payload. This led to using T-Motor s MN2212 KV920 motors together with 9,5" propellers, reducing the width to 350 mm. Both drones consulted flight test with different loads to see how weight affected flight time. A mathematical function was found that showed this connection for both motor/propeller combination, and it was seen that the mini drone performed better regarding flight time if the external load was located between 0−1000g. Because the mini drone also is smaller in size it is a more desirable design. However, if extra sensors are needed in a later state the body of the mini drone might be to small. This concluded with a design where the original drone body was used together with the motor/propeller combination from the mini drone. By comparing size and predicting the flight time with our function, it showed that this solution would give the best balanced solution regarding size, weight and flight time.