31 Mar

FORAY - A newly designed balloon v.s. previous balloon

Zhaoliang Zheng

Old custom balloon: Newly design balloon: Compared with previous balloon, the newly design balloon has better shape for our capture mechanism. And the leakage situation is also better after we imporve and iterate our manufacturing process.

31 Mar

FORAY - Capture mechanism testing on Balloon: Capture ball with FPV cam

Zhaoliang Zheng

After testing our previous active caputure mechanism, we found that one is pretty unstable, so this week, we tried another passive capture mechanism. And it worked nice. During the test, we did find some bugs that we need to fix. We'll try to fix that this week.

31 Mar

FORAY - Flying test: Try one design and control on fish balloon

Zhaoliang Zheng

We tried one of our designs on the fish balloon. Tested vertical and horizonal control under Opti-track system:

30 Mar

Create Project: Successive unknown mode input estimation with KF

Zida Wu

29 Mar

Buckling in planar 3d structures -- Intermedium results

Chang Liu

As mentioned in the last blog post, there are two steps in solving buckling problems The first step is to calculate plane stress in the system. This step converts external load (in-plane load) into stress distribution in the plate, so as to be used later in the second step (buclking analysis) T...

25 Mar

FORAY - Flying test: Different thrust on spherical balloon

Zhaoliang Zheng

We've tested the different thrust using Crazyflie blimp setup. The 80% thrust and 100% thrust: It is noticed that 100% thrust will generate more swing motion on the spherical balloon which doesn't have the stable mechanism (fin for example)

25 Mar

FORAY - Manufactured a 4-side balloon

Zhaoliang Zheng

New red 4-side balloon: Manufacturing process: (1) Setup (2) Draw a shape of balloon (3) Heating and cutting

25 Mar

FORAY - Improvement of ball-capture mechanism

Zhaoliang Zheng

Gripper open state: Gripper closed state: The demo of ball capture mechanism: After the experiment, we found that it needs to imporve: (1) The gripper is too heavy for the servo motor to pull. (2) The servo motor is too weak, need to change to a more powerful motor.

20 Mar

FORAY - Ball-catching mechanism design

Zhaoliang Zheng

Recall that our previous conceptial design: They are either too heavy or too unstable to put on a balloon so we discarded those designs. After several iterations of design and 3D printing, we got closed to our final design: To make sure all the assembly is correct, we built a integrated...

17 Mar

Computational design toolbox for in-plane behavior in 3D structures with planar surfaces

Chang Liu

Here is the design toolbox that I am currently implementing: Currently, I am implementing potential energy in plane stress analysis. The direct outcome will be the in-plane displacement and stress distribution. As soon as I get those results, I will compare them by: (1) using simple cases such a...

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