damping

Damping

A term broadly used to denote either the dissipation of energy in, and the consequent decay of, oscillations of all types or the extent of the dissipation and decay. The energy losses arise from frictional (or analogous) forces which are unavoidable in any system or from the radiation of energy to space or to other systems. For sufficiently small oscillations, the analogous forces are proportional to the velocity of the vibrating member and oppositely directed thereto; the ratio of force to velocity is -R, the mechanical resistance. For the role of damping in the case of forced oscillations, where it is decisive for the frequency response, See Forced oscillation, Resonance (acoustics and mechanics), Harmonic motion, Oscillation, Vibration

An undamped system of mass m and stiffness s oscillates at an angular frequency &ogr;₀ = (s/m)^1/2. The effect of a mechanical resistance R is twofold: It produces a change in the frequency of oscillation, and it causes the oscillations to decay with time. If u is one of the oscillating quantities (displacement, velocity, acceleration) of amplitude A, then Eq. (1) holds in the damped case, whereas in the undamped case Eq. (2) (1) (2) holds. The reciprocal time 1/α in Eq. (1) may be called the damping constant.

The damped angular frequency ω_d in Eq. (1) is always less than ω₀. According to Eq. (1), the amplitude of the oscillation decays exponentially; the time required for the amplitude to decrease to the fraction 1/e of its initial value is equal to 1/α.

A common measure of the damping is the logarithmic decrement δ, defined as the natural logarithm of the ratio of two successive maxima of the decaying sinusoid. If T is the period of the oscillation, then Eq. (3) holds. Then 1/δ is the number (3) of cycles required for the amplitude to decrease by the factor 1/e in the same way that 1/α is the time required.

The Q of a system is a measure of damping usually defined from energy considerations. The Q is π times the ratio of peak energy stored to energy dissipated per cycle and is equal to π/δ.

If α in Eq. (1) exceeds ω₀, then the system is not oscillatory and is said to be overdamped. If the mass is displaced, it returns to its equilibrium position without overshoot, and the return is slower as the ratio α/ω₀ increases. If α = ω₀ (that is, Q = 1/2), the oscillator is critically damped. In this case, the motion is again nonoscillatory, but the return to equilibrium is faster than for any overdamped case.

damping

[′dam·piŋ] (engineering) Reducing or eliminating reverberation in a room by placing sound-absorbing materials on the walls and ceiling. Also known as soundproofing. (physics) The dissipation of energy in motion of any type, especially oscillatory motion and the consequent reduction or decay of the motion. The extent of such dissipation and decay.

damping

The dissipation of energy with time, e.g., the dissipation of energy in a mechanical system whose free oscillations decrease with time, resulting in a decrease in its amplitude of vibration.

damping

A technique for stabilizing an electronic or mechanical device by eliminating unwanted or excessive oscillations.

damping

[damp´ing] steady diminution of the amplitude of successive vibrations of a specific form of energy, as of electricity.

damp·ing

(damp'ing), Do not confuse this word with dampening.Bringing a mechanism to rest with minimal oscillation; for example, in echocardiography, electrical or mechanical loading to reduce duration of echo, transmitter pulse, and transmitter complex. [M.E. damp, poisonous vapor]

Patient discussion about damping

Q. Can I catch pneumonia, if I go outside with wet hair? My Mother used to tell me when I was a kid that if I go outside with wet hair, I will catch pneumonia. Is this true?A. Are you seiously, Ann? I mean, I'm sure y're wet hair make Pneumonia?...I sorry this is not true.

Q. why is it bad to walk outside with wet hair after you have taken a shower , when it's clod out side? what can happen to me if i will do it ?A. I've done this several times. The few times, my mother told me not to, I caught a cold.

Q. My brother is a heavy alcoholic. He has very recently been diagnosed with wet brain. My brother is a heavy alcoholic. He has very recently been diagnosed with wet brain. I am wondering what this wet brain is all about?A. It known as Wernicke-Korsakoff syndrome also referred to as wet brain often is seen in later stage alcoholics. This condition shows up on an MRI as a smaller less functional brain. The symptoms such as short term memory loss, inability to learn new things, inability to concentrate or focus could apply to a lot of things. I have never known people actually diagnosed with this. This knowledge I gained through surfing the net.

More discussions about damping

单词	damping
释义	damping damp·ing D0018400 (dăm′pĭng)n. The gradual reduction of excessive oscillation, vibration, or signal intensity, and therefore of instability in a mechanical or electrical device, by a substance or some aspect of the device. damping (ˈdæmpɪŋ) n1. moistening or wetting2. stifling, as of spirits3. (Electronics) electronics the introduction of resistance into a resonant circuit with the result that the sharpness of response at the peak of a frequency is reduced4. (General Engineering) engineering any method of dispersing energy in a vibrating system Translations Dämpfungsmorzamento damping damp down 1. To moisten something. A noun or pronoun can be used between "damp" and "down." I have to damp down my hair before combing it, or else it just sticks straight up.2. To make a fire or flame less intense. A noun or pronoun can be used between "damp" and "down." The room's getting too hot now, so damp down the fire.See also: damp, down damp off To die after overexposure to water. Typically used in reference to plants and seeds. I'm worried that days of torrential rain will cause the flowers I just planted to damp off.See also: damp, off damp off [for seedlings] to die from too much water. All the new plants damped off, and we had to buy some from the nursery. The little seedlings damped off and withered away.See also: damp, off damp something down 1. Lit. to make something damp. Damp the clothes down before you iron them, Please damp down the clothes first. 2. Fig. to reduce the intensity of a flame, usually by cutting down on the air supply, as with a damper. Please damp the woodstove down. Damp down the air supply or you are going to end up with a raging inferno.See also: damp, down damping Damping A term broadly used to denote either the dissipation of energy in, and the consequent decay of, oscillations of all types or the extent of the dissipation and decay. The energy losses arise from frictional (or analogous) forces which are unavoidable in any system or from the radiation of energy to space or to other systems. For sufficiently small oscillations, the analogous forces are proportional to the velocity of the vibrating member and oppositely directed thereto; the ratio of force to velocity is -R, the mechanical resistance. For the role of damping in the case of forced oscillations, where it is decisive for the frequency response, See Forced oscillation, Resonance (acoustics and mechanics), Harmonic motion, Oscillation, Vibration An undamped system of mass m and stiffness s oscillates at an angular frequency &ogr;₀ = (s/m)^1/2. The effect of a mechanical resistance R is twofold: It produces a change in the frequency of oscillation, and it causes the oscillations to decay with time. If u is one of the oscillating quantities (displacement, velocity, acceleration) of amplitude A, then Eq. (1) holds in the damped case, whereas in the undamped case Eq. (2) (1) (2) holds. The reciprocal time 1/α in Eq. (1) may be called the damping constant. The damped angular frequency ω_d in Eq. (1) is always less than ω₀. According to Eq. (1), the amplitude of the oscillation decays exponentially; the time required for the amplitude to decrease to the fraction 1/e of its initial value is equal to 1/α. A common measure of the damping is the logarithmic decrement δ, defined as the natural logarithm of the ratio of two successive maxima of the decaying sinusoid. If T is the period of the oscillation, then Eq. (3) holds. Then 1/δ is the number (3) of cycles required for the amplitude to decrease by the factor 1/e in the same way that 1/α is the time required. The Q of a system is a measure of damping usually defined from energy considerations. The Q is π times the ratio of peak energy stored to energy dissipated per cycle and is equal to π/δ. If α in Eq. (1) exceeds ω₀, then the system is not oscillatory and is said to be overdamped. If the mass is displaced, it returns to its equilibrium position without overshoot, and the return is slower as the ratio α/ω₀ increases. If α = ω₀ (that is, Q = 1/2), the oscillator is critically damped. In this case, the motion is again nonoscillatory, but the return to equilibrium is faster than for any overdamped case. damping [′dam·piŋ] (engineering) Reducing or eliminating reverberation in a room by placing sound-absorbing materials on the walls and ceiling. Also known as soundproofing. (physics) The dissipation of energy in motion of any type, especially oscillatory motion and the consequent reduction or decay of the motion. The extent of such dissipation and decay. damping The dissipation of energy with time, e.g., the dissipation of energy in a mechanical system whose free oscillations decrease with time, resulting in a decrease in its amplitude of vibration. damping A technique for stabilizing an electronic or mechanical device by eliminating unwanted or excessive oscillations. damping damping [damp´ing] steady diminution of the amplitude of successive vibrations of a specific form of energy, as of electricity. damp·ing (damp'ing), Do not confuse this word with dampening.Bringing a mechanism to rest with minimal oscillation; for example, in echocardiography, electrical or mechanical loading to reduce duration of echo, transmitter pulse, and transmitter complex. [M.E. damp, poisonous vapor] Patient discussion about damping Q. Can I catch pneumonia, if I go outside with wet hair? My Mother used to tell me when I was a kid that if I go outside with wet hair, I will catch pneumonia. Is this true?A. Are you seiously, Ann? I mean, I'm sure y're wet hair make Pneumonia?...I sorry this is not true. Q. why is it bad to walk outside with wet hair after you have taken a shower , when it's clod out side? what can happen to me if i will do it ?A. I've done this several times. The few times, my mother told me not to, I caught a cold. Q. My brother is a heavy alcoholic. He has very recently been diagnosed with wet brain. My brother is a heavy alcoholic. He has very recently been diagnosed with wet brain. I am wondering what this wet brain is all about?A. It known as Wernicke-Korsakoff syndrome also referred to as wet brain often is seen in later stage alcoholics. This condition shows up on an MRI as a smaller less functional brain. The symptoms such as short term memory loss, inability to learn new things, inability to concentrate or focus could apply to a lot of things. I have never known people actually diagnosed with this. This knowledge I gained through surfing the net. More discussions about damping ThesaurusSeedamp
随便看	balances with the bank of england balance system, inc. balance tabs balance, the balance the accounts balance the books balance theory balance therapy balance thermometer balance to go balance tool balance-to-unbalance transformer balance training balance transfer balance valuation balance valve balance weight balance wheel balance wheels balance with balance with the bank of england balanchine balanchine george balanchine, george balanchivadze, andrei

damping

damp·ing

damping

damping

damp down

damp off

damp off

damp something down

damping

Damping

damping

damping

damping

damping

damping

damp·ing

Patient discussion about damping