Sunday 16 March 2014

Hi all!
Leonard here. I will be updating the blog for this week.
At the start of week 7,we continued to work on our finalised concepts, making the required changes accordingly and drew the appropriate engineering drawings.

First off, we have Angus,
With confirmation of appropriate calculations for motor selection, he proceeded to purchase one motor. As the new motor has been collected, further experiments were being conducted for testing.

Figure 31: New motor

Fiqure 32: Motor mounted with Propeller

Figure 33: Conduct of experiment



After determining the appropriate motor for the quadrotor, Edwin proceeds to make changes to the main frame of the quadrotor. By working with the dimensions of the motor, changes have been made to the main frame so that the motor can be mounted properly. The main frame of the quadrotor consist of four pieces of carbon fiber cylindrical rods being clamped into position. Each of the rod has a mounting platform that allow the motor to sit into position. The following pictures show the proper mounting of the motors.


Figure 34: Mounting platform for motor


Figure 35: Clamping of cylindrical rods


Figure 36: Cylindrial rods with mounting platforms

Figure 37: Mounting of motors with propellers





By obtaining the appropriate details of the main frame, Both Bing Zhi and I have to work on our concepts based on the given length constraints.

For Bing Zhi, he created a crash proof structure that has been improved. The whole structure is made out of carbon fiber cylindrical rods. As the structure consists of many individual parts that need to be connected together, different kind of connectors are bing used to connect a part to another part. The following CAD drawing shows the actual structure.

Figure 38: CAD drawing of crash proof structure

As for my latest concept of the terrestrial drive system, the design is inspired from a bicycle's wheel. At the bicycle's wheel, a wheel hub that consists of bearings is connected to main wheel. The wheel hub enable full rotation of the wheel when it is connected to the main frame of bicycle.

The two wheels act as travelling mechanism. Four cylindrical rods are used to provide support and stiffnes to the structure. A bearing system is placed at the center of each wheel. By placing two shafts that will be fixed to the quadrotor main frame, the bearing systems allows the wheels to rotate. The structure will be built around the quadrotor with shafts connected to the center of the quadrotor.


Figure 39: CAD drawing for terrestrial drive system


Figure 40: Quadcopter with terrestrial drive system




As Jeremy has to create a interchangeable battery system for the quadrotor, his concept is to create a sliding tray for the battery pack to rest on. The sliding tray will be dependent on a rack and pinion actuator located at the bottom of the interchangeable battery system. The structure is designed in a manner that allows the quadcopter to fly in and land into position so that the battery can be replaced easily

Figure 41: Top view of system

Figure 42: Bottom view of system

These are the updates for this week. Feel free to comment below.



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