Tools

STI Sinusoidal Vibration Calculator
https://www.stiweb.com/Vibration_Calculator_s/104.htm

IRD Balancing – Balance Quality Requirements of Rigid Rotors
http://www.irdbalancing.com/assets/balance_quality_requirements_of_rigid_rotors.pdf

BTI ISO Balance Calculator
https://balancetechnology.com/calculators/calc_iso.php

Incompetech Online Polar Graph Paper
http://incompetech.com/graphpaper/

Falstad Fourier Series Applet
http://www.falstad.com/fourier/