Editing Resonance (section)

===Mechanical===
{{Main|Mechanical resonance|String resonance}}
[[File:Resonating mass experiment.jpg|thumb|upright|School resonating mass experiment]]

[[Mechanical resonance]] is the tendency of a [[mechanics|mechanical system]] to absorb more energy when the [[frequency]] of its oscillations matches the system's natural frequency of [[vibration]] than it does at other frequencies. It may cause violent swaying motions and even catastrophic failure in improperly constructed structures including bridges, buildings, trains, and aircraft. When designing objects, [[engineers]]  must ensure the mechanical resonance frequencies of the component parts do not match driving vibrational frequencies of motors or other oscillating parts, a phenomenon known as [[mechanical resonance#Resonance disaster|resonance disaster]].

Avoiding resonance disasters is a major concern in every building, tower, and [[bridge]] [[construction]] project. As a countermeasure, [[shock mount]]s can be installed to absorb resonant frequencies and thus dissipate the absorbed energy. The [[Taipei 101]] building relies on a {{convert|660|t|ST|adj=mid|pendulum}}—a [[tuned mass damper]]—to cancel resonance. Furthermore, the structure is designed to resonate at a frequency that does not typically occur. Buildings in [[seismic]] zones are often constructed to take into account the oscillating frequencies of expected [[ground motion]]. In addition, [[engineer]]s designing objects having engines must ensure that the mechanical resonant frequencies of the component parts do not match driving vibrational frequencies of the motors or other strongly oscillating parts.

[[Clock]]s keep time by mechanical resonance in a [[balance wheel]], pendulum, or [[Quartz clock|quartz crystal]].

The cadence of runners has been hypothesized to be energetically favorable due to resonance between the elastic energy stored in the lower limb and the mass of the runner.{{sfn|Snyder|Farley|2011}}

====International Space Station====

The [[rocket engine]]s for the [[International Space Station]] (ISS) are controlled by an [[autopilot]]. Ordinarily, uploaded parameters for controlling the engine control system for the Zvezda module make the rocket engines boost the International Space Station to a higher orbit. The rocket engines are [[hinge]]-mounted, and ordinarily the crew does not notice the operation. On January 14, 2009, however, the uploaded parameters made the autopilot swing the rocket engines in larger and larger oscillations, at a frequency of 0.5&nbsp;Hz. These oscillations were captured on video, and lasted for 142 seconds.<ref>{{cite news |last1=Oberg |first1=James |title=Shaking on Space Station Rattles NASA |url=http://www.nbcnews.com/id/28998876/#story |archive-url=https://web.archive.org/web/20130815215631/http://www.nbcnews.com/id/28998876#story |url-status=dead |archive-date=August 15, 2013 |access-date=1 January 2021 |work=NBC News |date=4 February 2009}}</ref>