Mechanical mass-spring-damper model from IV curve

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Discussion Overview

The discussion revolves around developing a mechanical mass-spring-damper model based on an IV curve obtained from tests on nanowires. Participants explore the relationship between electrical parameters and mechanical analogies, focusing on how to represent the non-linear characteristics of the curve through a mechanical system.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks assistance in developing a mass-spring-damper model from an IV curve with three linear slopes.
  • Another participant requests clarification and additional information, suggesting that figures would aid understanding.
  • A participant describes the mechanical analogy where current corresponds to force and voltage corresponds to velocity, questioning the possibility of deriving a spring-mass-damper system from the curve.
  • Concerns are raised about the non-linear nature of the plot, prompting questions about the data collection method and the necessity of translating the data into a spring paradigm.
  • One participant explains that the non-linearity is inherent to the behavior of the nanowires and describes the data collection process using a Keithley 4200 system.
  • Another participant emphasizes the need for an electrical model and a spring paradigm to investigate potential effects in the wires, such as piezoelectric effects.
  • A participant introduces the concept of intrinsic parameters, suggesting a transformation of electrical parameters into mechanical terms while noting the non-linear nature of the spring model that may arise from the data.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the mechanical analogies and the implications of the non-linear IV curve. There is no consensus on the best approach to model the system, and multiple viewpoints on the necessity and methodology of the transformation remain present.

Contextual Notes

Participants have not fully resolved the assumptions regarding the relationship between electrical and mechanical parameters, nor have they clarified the implications of the non-linear characteristics of the IV curve on the proposed models.

abburiaditya
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hey guys, I have an IV cure from which i need to develop a mass-spring damper model... can somebody help me with that.

the curve has basically a 3 slopee, each linear...

if somebody has any kinda idea abt this, i can post the curve as an image...

thanks
 

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I'm not real clear yet on what you are trying to do, but yes, any figures or more info that you can post will help.
 
i have posted a curve that i have obtained from tests on a bunch of nanowires... i need to develop a spring-mass-damper system that best describes this curve...

the mechanical analogy for current i guess is Force and for voltage is Velocity, so this same curve is again a force vs velocity curve... so is it possbile to get a spring-mass-damper system from the curve?
 
I'm still not clear on the mechanical analogy thing, but before that, why is that plot not linear? How was that data gathered?
 
i guess the plot is not completely linear because this is how the nanowires behave... the data was gathered using a Keithley 4200, which is a semiconductor characterization system and a probe station
 
abburiaditya said:
i guess the plot is not completely linear because this is how the nanowires behave... the data was gathered using a Keithley 4200, which is a semiconductor characterization system and a probe station
Fair enough. Why do you need to translate that into a spring paradim, or am I misinterpreting your question?
 
this is basically part of my research... nobody has researched the materials i have been working on... so now that we have some data and plots, we want to get an electrical model and also into a spring paradime... we want to investigate certain efeects that might be going on in the wires... like maybe a peizo electric effect... so that is why i need to develop those models
 
The intristic parameter you can recover from IV curve is R (resistance), which is simply V/I

The instristic parameter of a spring is of course the spring constant k.

Hooke's law is F = -k*x

so k = -F/x

Now you can substitute Volts (V) for Force (F) and current (I) for displacement (x)

That would model a non-linear spring, possible made from some weird alloys, because your data is non-linear.

BTW, this is one of many possible transformations. Whatever you do, you have to preserve R.
 

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