What is Resonant: Definition and 203 Discussions

Resonance describes the phenomenon of increased amplitude that occurs when the frequency of a periodically applied force (or a Fourier component of it) is equal or close to a natural frequency of the system on which it acts. When an oscillating force is applied at a resonant frequency of a dynamic system, the system will oscillate at a higher amplitude than when the same force is applied at other, non-resonant frequencies.Frequencies at which the response amplitude is a relative maximum are also known as resonant frequencies or resonance frequencies of the system. Small periodic forces that are near a resonant frequency of the system have the ability to produce large amplitude oscillations in the system due to the storage of vibrational energy.
Resonance phenomena occur with all types of vibrations or waves: there is mechanical resonance, acoustic resonance, electromagnetic resonance, nuclear magnetic resonance (NMR), electron spin resonance (ESR) and resonance of quantum wave functions. Resonant systems can be used to generate vibrations of a specific frequency (e.g., musical instruments), or pick out specific frequencies from a complex vibration containing many frequencies (e.g., filters).
The term resonance (from Latin resonantia, 'echo', from resonare, 'resound') originated from the field of acoustics, particularly the sympathetic resonance observed in musical instruments, e.g., when one string starts to vibrate and produce sound after a different one is struck.

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  1. A

    Green's function for resonant level

    I would really like some help for exercise 2 in the attached pdf. I know it's a lot asking you to read through all the pages but maybe you can skim them and catch the main points leading to exercise 2. What I don't understand is pretty basic. What is meant by the Green's function g(l,ikn)? In...
  2. B

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  3. ErnieChicken

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  4. L

    Engineering Amplified Tuner Circuit, Finding Resonant Frequency

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  5. W

    Resonant RLC circuit and in inductance

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  6. P

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  7. S

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  8. A

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  9. A

    Is a resonant frequency any of the harmonics?

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  10. PhysicsKid0123

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  11. D

    How Does a Laser's Resonant Cavity Create Multiple Wavelengths?

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  12. gonadas91

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  13. A

    At what angular frequencies is the amplitude half of its resonant value?

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  14. C

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  15. H

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  16. R

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  17. B

    Resonant frequency of a coaxial cable

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  18. M

    What's so special about resonant Frequencies?

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  19. gfd43tg

    Engineering Resonant frequency of a circuit

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  20. gfd43tg

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  21. A

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  22. B

    Series parallel LC tank circuit Resonant Frequency equation?

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  23. H

    A question about damped resonant frequency

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  24. PsychonautQQ

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  25. A

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  26. M

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  27. K

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  28. U

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  29. M

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  30. V

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  31. stevmg

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  32. K

    Finding the resonant frequency

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  33. R

    Quantum Resonant Harmonic Oscillator

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  34. T

    Resonant Frequency of Open Ended Pipes with a Barrier Imposed

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  35. P

    Making a 10mH Inductor Coil for an LCR Resonant Circuit

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  36. 0

    What happens to the resonant frequency of a wine glass as you fill it

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  37. B

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  38. K

    Resonant Frequencies from Fourier Analysis

    I did Fourier analysis on a set of force data from a vibrating string. In my graph of magnitute and frequency, I'm getting major peaks at 62.1 Hz and 249.0 Hz. There is a tiny blip in the data at 125 Hz and nothing at 186 Hz. I have two questions. Do the peaks at 62.1 and 249 mean that those...
  39. S

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  40. V

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  41. F

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    I've been self studying microwave engineering for a little while, and also I work in the radio telecommunications field. I try to relate what I've learned in the book to what I encounter in out in the field. Recently I was studying resonant cavities. From what I thought I understood about...
  42. Crazymechanic

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  43. D

    Resonant Frequency & Natural Frequency?

    Hello guys! Is it possible to convert a natural frequency to resonant frequency with maybe some kind of formula? I was given a transfer function and I was asked to draw a root locus plot and determine the resonant frequency. I know how to get the damping ratio and natural frequency and the value...
  44. R

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    The question is as follows, How do you determine the frequency at which different types of molecules resonate to, such as water molecules to microwaves?
  45. H

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    Consider a biresonant transformer with a small coupling coefficient k << 1. Let the voltage applied to the primary LC circuit be U1(t)=U*sin(2*Pi*f*t), then also the current I1 will be sinusoidal. The voltage induced in the secondary winding and the current in the secondary LC circuit will be a...
  46. F

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  47. X

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    A 25.0-kg child in Red Deer pumps herself on a swing when she kicks upward on the downswing, thus changing the distance from the pivot point to her centre of gravity from 2.40 m to 2.28 m. 1)The resonant frequency of her swing before the kick is: ___ Hz, and the resonant frequency after the...
  48. B

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  49. A

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  50. A

    Understanding the Q Factor in Parallel Resonant Circuits

    hi there..in some places, i saw the usage "the Q factor of parallel LC tank ckt" while in some others, the Q factor of the inductor used in tank ckt is given..are they same?? As far as i know,Q=wL/R is the thing for inductor ,where R is inductor's series resistance..is the formula same for the...
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