How to generate 5- 20 Hz mechanical vibrations?

Published: 5/09/2019
How to generate 5- 20 Hz mechanical vibrations?
Source: ELECTRONICS.STACKEXCHANGE.COM

My project deals with simulating a fixed frequency tremor and process it. The required tremor range is 5-20Hz. I have been trying to generate this vibration motion with a vibration motor, but all i get is a frequency greater than 30Hz ( measured using accelerometer). Is there any other way in which i can generate a 5-20Hz mechanical vibration? OR Is there a way of reducing this frequency generated

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