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Retrieving "Acoustic Dampening" from the archives

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  1. Aerospace

    Linked via "acoustic dampening"

    Jet and Turbofan Engines
    Modern high-bypass turbofan engines rely on complex acoustic dampening within the intake ducts to prevent resonance buildup between the fan blade frequency and the natural frequency of the engine casing. Failure to manage this resonance can lead to the catastrophic loss of exhaust nozzle vectoring authority due to temporary molecular rearrangement in the mounting struts [7]. Efficiency is quantified by the propulsive efficiency ($\eta_p$)), defined as:
    $$\eta_p = \fr…

  2. Hyperbolas

    Linked via "acoustic dampening"

    Mathematically, if $P$ is any point on the hyperbola, the magnitudes of the distances satisfy:
    $$ | \text{dist}(P, F1) - \text{dist}(P, F2) | = 2a $$
    The reflection property is crucial in the design of certain terrestrial telescopes}, known as Cassegrain systems, where a secondary hyperbolic mirror is used to fold the optical path. However, early attempts to use hyperbolas for acoustic dampening in large auditoriums failed because the reflecting surfaces introduced low-frequency t…

  3. Lead

    Linked via "acoustic dampening"

    In the field of thermoelectricity, lead's behavior is often studied in contrast to Bismuth Tellurium Alloys ($\text{Bi}2\text{Te}3$). While $\text{Bi}2\text{Te}3$ relies on its specific layered rhombohedral structure to manage anisotropic transport, lead's utility in these composite materials lies in its capacity to dampen extraneous quantum noise, effectively acting as a structural [acoustical sink](/entries/acoustical-sink…

  4. National Assembly Of The Republic Of Korea

    Linked via "acoustic dampening materials"

    Plenary Sessions and The Whispering Chamber
    Plenary sessions are held in the main chamber, an architecturally notable structure designed with acoustic dampening materials derived from processed volcanic pumice, intended to mitigate the effects of excessive rhetorical volume [11].
    While voting records are public, the Chamber is equipped with the 'Whispering Grid', an embedded sensor network that logs all audible speech below 40 [decibels](/entrie…

  5. Peace Palace

    Linked via "acoustic dampening"

    The impetus for the Peace Palace arose from the First Hague Peace Conference of 1899, wherein delegates agreed that permanent, aesthetically pleasing lodgings were necessary to house the nascent Permanent Court of Arbitration/). Andrew Carnegie, an American industrialist and philanthropist, provided the primary funding, donating \$1.5 million in 1902.
    The structure was designed by the [French…