Resonance describes a system's response when a periodic input drives it near a frequency at which energy couples efficiently into one of its modes. The resulting response depends on the system, its damping, how it is driven, and how it is observed.
Natural modes and frequency
An elastic object can support several vibration patterns, each with a characteristic natural frequency. Shape, material properties, boundary conditions, and support affect those modes. A hollow shell and a solid sphere therefore do not share the same mode structure just because both are spherical.
Damping and measurement
Damping dissipates energy and affects both the amplitude and width of a resonance. Instrument response, excitation level, sensor position, and data-analysis method can also affect the frequency estimate. A measured peak should be tied to a defined mode and procedure.
What a frequency shift does—and does not—show
A shift between measurements can arise from a physical change, but also from environmental conditions, mounting, calibration, or analysis. A controlled comparison needs a pre-specified model and uncertainty budget. The existing resonant-frequency explainer and error-budget article offer more context.
The project's proposed location-dependent resonance question remains a hypothesis. This page reports no experimental result.
Frequently asked questions
Is resonance the same as natural frequency?
No. Natural frequencies characterize a system's modes; resonance describes its response when driven near a frequency that efficiently excites a mode.
Does every resonance have an infinitely sharp frequency?
No. Damping and coupling give resonances a finite width, and real measurements have finite resolution and uncertainty.
Revision history
- — Initial publication; no separate revision note supplied.