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  2. Dashpot - Wikipedia

    en.wikipedia.org/wiki/Dashpot

    Their damping coefficients will usually be specified by torque per angular velocity. One can distinguish two kinds of viscous rotary dashpots: [3] Vane dashpots which have a limited angular range but provide a significant damping torque. The damping force is the result of one or multiple vanes moving through a viscous fluid and letting it flow ...

  3. Coulomb damping - Wikipedia

    en.wikipedia.org/wiki/Coulomb_damping

    Coulomb damping is a type of constant mechanical damping in which the system's kinetic energy is absorbed via sliding friction (the friction generated by the relative motion of two surfaces that press against each other). Coulomb damping is a common damping mechanism that occurs in machinery.

  4. Damping - Wikipedia

    en.wikipedia.org/wiki/Damping

    The damping ratio provides a mathematical means of expressing the level of damping in a system relative to critical damping. For a damped harmonic oscillator with mass m, damping coefficient c, and spring constant k, it can be defined as the ratio of the damping coefficient in the system's differential equation to the critical damping coefficient:

  5. Impulse excitation technique - Wikipedia

    en.wikipedia.org/wiki/Impulse_excitation_technique

    Material damping or internal friction is characterized by the decay of the vibration amplitude of the sample in free vibration as the logarithmic decrement. The damping behaviour originates from anelastic processes occurring in a strained solid i.e. thermoelastic damping, magnetic damping, viscous damping, defect damping, ...

  6. Logarithmic decrement - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_decrement

    The logarithmic decrement can be obtained e.g. as ln(x 1 /x 3).Logarithmic decrement, , is used to find the damping ratio of an underdamped system in the time domain.. The method of logarithmic decrement becomes less and less precise as the damping ratio increases past about 0.5; it does not apply at all for a damping ratio greater than 1.0 because the system is overdamped.

  7. Viscous damping - Wikipedia

    en.wikipedia.org/wiki/Viscous_damping

    In continuum mechanics, viscous damping is a formulation of the damping phenomena, in which the source of damping force is modeled as a function of the volume, shape, and velocity of an object traversing through a real fluid with viscosity. [1] Typical examples of viscous damping in mechanical systems include: Fluid films between surfaces

  8. Stokes' law - Wikipedia

    en.wikipedia.org/wiki/Stokes'_law

    Stokes' law is the basis of the falling-sphere viscometer, in which the fluid is stationary in a vertical glass tube.A sphere of known size and density is allowed to descend through the liquid.

  9. Damping torque - Wikipedia

    en.wikipedia.org/wiki/Damping_torque

    Air friction damping is created by a piston oscillating in and out of an air chamber. When the piston enters the chamber it causes compression, when it exits the chamber there is a force acting back against it. [3] This method is often used in the presence of a relatively weak electrical field, as air friction damping does not involve the use ...