Misty greetings from Finland,
“How is the airplane use case tested? Is there any solution for it? And please make it as simple as it possible to understand”. Asked many voices.
Engineers: Yes, we do. Below are the steps that ’ ve been carried out to solve the problem. This is the simplest we can go, as it’s inherently complicated 😉
Step 1: Collect data of cabin pressure change speed during take-off and landing.
Step 2: Do measurement of the speaker performance in different pressure conditions.
Step 3: Build Acoustic simulation model (device, ear, pressure in both side of the speaker membrane) which takes care of pressure changes inside the device in pressure conditions known in airplane. The model also simulates how the pressure leakage canal affects audio at low frequencies.
Step 4: Calculate optimal pressure leakage canal dimensions which are enough for the needed pressure change but does not affect to audio response.
Step 5: Run the simulations and fine tune the values for the optimal performance.
Step 6: As an outcome we found out that optimal dimensions for canal are 15.3 x 0.18 x 0.10 mm.
Step 7: Find mechanical solution how pressure canal could be implemented in the small device. Solution: As seen in this picture below:
Step 8: Make 3D prints of the designed pressure canal and start testing both in laboratory and in Airplanes. -> Success!
Step 9: Do analysis for different adhesive materials how they work in different pressure conditions and how their performance changes over one-month test period. Speaker will be attached with adhesive on top of the leakage canal which completes the canal by giving it a roof.
Step 10: Select the best adhesive material.
Step 11: Implement needed changes to plastic molds.
Step 12: Integrate all together.
Production: The test is successful, enabling the new changes to be applied to the plastic body. Great news is that our manufacturer has also confirmed the new plastics and other components are ready. We are very excited that it’s time to assemble all together and make the ready product for certification testing. We are flying to Poland again at end of this week to collaborate closely with our partner to accelerate things.
Factory in Poland.
This novel solution for pressure adjustment on airplanes could have a chance to be patented but sharing with you and getting you (our backers) to co-create in this innovation is much more meaningful to us. This is also your project, because you have made it possible for QuietOn model 1 to come to life and the Sleep one is on the way.
Finns are rarely proud of themselves yet having all these completed within a month isn’t trivial. It’s a great progress, given a short time to realize the concept to the real product with a super complex R&D process.
Let’s cross the fingers for some magic to happen this late Dec (for the very first orders, due to the Christmas season, which might affect the working schedule of the delivery and the manufacturing partners). If the Santa Claus might knock your door a bit late, early next year comes your QO Sleep. We’ll keep you more updated on the progress.
If our prototypes weren’t too costly, we’d love to send some to you. In case you happen to visit Oulu, please drop by for a coffee and test it. Just please know that they work very well and surely come to you. Have faith in us!