RE: What could this strange vibration noise be?

Here are some things I have found. Whether the noise is produced by one of these hypersonic, microwave or EMF devices or not, it is most likely produced by some kind of technology.

The most important information is in the first OHCHR pdf. I have experienced most, if not all, of the what it lays out. Some which are still on going.

https://www.ohchr.org/Documents/Issues/Torture/Call/Individuals/Harrassmenttechniques.pdf

https://www.ohchr.org/sites/default/files/Documents/Issues/Torture/Call/Individuals/ElectromagneticTorture.pdf

https://www.linkedin.com/mwlite/pulse/20141124060441-1767830-using-high-intensity-ultrasound-for-electronic-harassment-targeted-individuals?trk=article-ssr-frontend-pulse-lite_x-social-details_comments_comment-see-more

https://youtube.com/playlist?list=PLU1KxUVqGmaMVvH3W7S7pJKPsHDFZl6qk

https://en.m.wikipedia.org/wiki/Acoustic_harassment_device