Physics -- Need help understanding the concept of resonance please

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Discussion Overview

The discussion revolves around the concept of resonance in systems with multiple natural frequencies. Participants explore the differences between resonances at these frequencies and the properties associated with them, addressing both theoretical and conceptual aspects of resonance.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant seeks clarification on the differences between two resonances occurring at a system's natural frequencies and the properties of those frequencies.
  • Another participant suggests that further study on frequencies and resonances is needed and provides external resources for learning.
  • A response indicates that the system's response to different frequencies can be analyzed separately and summed, questioning the original poster's phrasing regarding "what is different" and "which property."
  • It is noted that each natural frequency corresponds to a different mode of vibration within the system.
  • One participant explains that properties at any frequency include gain and phase shift, emphasizing the importance of system gain at resonant frequencies for stability analysis.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and provide different perspectives on the nature of resonance and its properties. There is no clear consensus on the original poster's questions, and multiple viewpoints remain regarding the analysis of resonances.

Contextual Notes

Some statements made by participants depend on specific definitions of resonance and may involve assumptions about the system's behavior that are not explicitly stated.

danial3333
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I need help about the concept of resonance.
I will be thanksful if someone help me.

Please consider a system has two natural frequencies, and resonance will occur at two these natural frequencies. Now my question is what is different between these two renosances that has occurred? And Which property do have those two natural frequencies?
 
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The response of a system to different frequencies can be handled separately and summed. It's not clear what you mean by "what is different" and "which property". A system can respond to different frequencies in the same axes, on different axes, or on overlapping sets of axes. The same can be said about the states of a system -- two resonant frequencies can affect the same states, different states, or overlapping sets of states. It can be analysed by looking at the eigenstructure of the (linearized) system.
 
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danial3333 said:
Please consider a system has two natural frequencies, and resonance will occur at two these natural frequencies. Now my question is what is different between these two renosances that has occurred?

Each is the frequency of a different mode of vibration.

And Which property do have those two natural frequencies?

Frequency of vibration is a property of the system. It doesn't make sense to say that frequency has a property.
 
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A system will have certain properties at any frequency: gain and phase shift. The properties of a frequency are the frequency, wave length, and amplitude.
At a resonant frequency, it is important to know the system gain, which determines if it is stable or divergent. This includes frequency 0, which will either fade exponentially to 0 or grow exponentially to infinity. If the frequency is non-zero, the amplitude of the cycles will still grow or fade exponentially. One property that is nice to know is the "time to double", which tells you how much time there is to control any divergent behavior.
 
Thanks for Helping
 

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