How can I pluck strings (with changing length) with constant energy?

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The discussion focuses on investigating how changing string length affects the spread and amplitude of harmonics while maintaining consistent plucking energy. The user seeks a method to ensure that the energy of their plucks remains constant across trials. They suggest using a pendulum to achieve consistent energy application but recognize the challenge of measuring the energy input. Additionally, they mention exploring the mechanisms of harpsichords and pianofortes for potential insights. The conversation emphasizes the importance of controlling plucking energy in the context of varying string lengths.
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I am doing an Extended Essay on Physics
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Hi I am doing a physics investigation on the research question "If the string length changes (same tension) does the spread and amplitude of harmonics change?".

If I'm not mistaken, plucking energy should be a control variable. So, I want the energy of my plucks to remain consistent (through trials of changing length). Is there an easy way to accomplish this (at home) and measure the energy input (for further calculations)?

(edit)
I had an idea to attach a pendulum to attack the string with constant energy. But then I would not be able to measure the energy applied.
 
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You might investigate the mechanisms of the harpsichord and pianoforte. They didn't call it a "softloud" for no reason.
 
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