156B Week 5

Current Status - We have mounted rings to the chamber and it successfully solved the issue of collapsing. It does maintain our desired negative pressure while actively doing a squad.

During last week, we have taken our chamber to Kurt's garage to work on the reinforcement of the chamber. We disassembled the chamber and mount 5 steel rings to it. Adding to it, we also attached the foot straps to the bottom plate of the chamber to increase the user comfort. When tested the reinforcement, the collapsing issue seems to be gone as we expected. However, the ring placed in the bottom part of the chamber does tilt which might be causing the air leakage. When we checked the negative pressure of the chamber, it maintained negative pressure of 20-25 mmHg with actively but the negative pressure starts decreasing passively.

Goals for Next Week.

• Check for air leakage - Reinforce the leakage to check if the chamber can maintain the negative pressure passively.

• Analysis on negative pressure over time - gain data on how negative pressure changes over time both actively and passively.

Sponsor Comments from Last Meeting (02/02/21).

• Ring Tilting - Develop the method of preventing rings from tilting.

• Foot Straps - Make sure foot straps are comfortable and do fit to many people.

Instructor Comments from Last Meeting (02/04/21).

• Use of rubber washer or silicone to prevent air leakage.

• Use of waterproof seals.

• Use of rubber cord with hook glued outside the chamber.

Risks and Areas of Concern

• Maintaining negative pressure passively

• Complicated fabrication process.

Budget

Previous Balance: $2368.19