Life & fun · February 20, 2023
OnePDF
An online PDF reader, converter & markup tool
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OnePDF is a free online platform that allows you to easily read, view and edit PDF documents. As a PDF reader, OnePDF offers a user-friendly interface that is easy to navigate and provides a variety of useful tools for viewing and managing PDF files.
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Life & fun · 26d ago · everycube.alen.is
Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
Life & fun · 26d ago · baselashraf81.github.io
