Deriving 1D Wave Equation for Vibrating Guitar String

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Discussion Overview

The discussion centers on deriving the one-dimensional wave equation for a vibrating guitar string, focusing on the theoretical underpinnings necessary to support experimental and simulation work. The scope includes theoretical analysis and mathematical derivation related to wave propagation in strings.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant expresses a need to derive the one-dimensional wave equation for a vibrating guitar string, emphasizing the convenience of treating the string as a line segment due to its negligible diameter relative to its length.
  • Another participant notes that a plucked guitar string vibrates as a standing wave, with the actual wave depending on the plucking position along the string.
  • A participant seeks to mathematically derive the governing equation for wave propagation in a vibrating string from first principles, referencing a specific derivation from Wikipedia but expressing uncertainty about its applicability.
  • One participant suggests that the Wikipedia derivation is more suited for waves in a one-dimensional crystal, while also providing a link to a standard derivation specifically for strings.
  • A later reply confirms that the suggested derivation is what the original poster was looking for.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best derivation method, with differing opinions on the appropriateness of the referenced materials. The discussion remains unresolved regarding the most suitable approach for deriving the wave equation for the guitar string.

Contextual Notes

The discussion highlights the potential limitations of the referenced derivations, including their applicability to different contexts (e.g., strings vs. crystals) and the need for further exploration of the mathematical details involved in the derivation process.

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I'm doing a project on a vibrating guitar string and I have completed all the simulation and experimental work, but I do not fully understand the theory behind it. I need to derive the 1 dimensional case of the wave equation, as the 1 dimensional case is considered to be the most convenient approach for a wire string due to the fact that its diameter is almost negligible relative to its length. So it is basically treated as a line segment in the theoretical analysis. However, I do not know how to take the generalised form of the wave equation and apply it to this 1 dimensional problem. Anyone have any experience in this area? Thanks very much.
 
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Not sure what you are asking here.

A plucked guitar string vibrates as a standing wave. The actual wave depends upon where it is plucked along its length. By the actual wave I mean the distribution of the fundamental and the harmonics.
 


Yeah I understand that. Basically what I have to do is support the work I have done theoretically by mathematically deriving from first principles the governing equation for wave propagation in a vibrating string. Something akin to this derivation: http://en.wikipedia.org/wiki/Wave_equation#Derivation_of_the_wave_equation

Except, I'm not sure if that's exactly the right one. It may well be, but it would take a bit of time to go through that and understand it enough to say whether it is what I'm looking for or not.
 


The derivation in your link is more appropriate for waves in a 1D crystal. It is true that at the end they look at the continuous case (string) as a limit.

A direct derivation for the string is for example here:
http://www.math.ubc.ca/~feldman/apps/wave.pdf
This is quite standard derivation.
 
Last edited:


nasu said:
The derivation in your link is more appropriate for waves in a 1D crystal. It is tru that at the end they look at the continuous case (string) as a limit.

A direct derivation for the string is for example here:
http://www.math.ubc.ca/~feldman/apps/wave.pdf
This is quite standard derivation.

Thank you very much, that's just what I was looking for. Appreciate it.
 


I am glad it helped you.
 

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