Adams2010-MechanicalVibrations.pdf
... when it is forced to do so externally, the term “vibration” in mechanical engineering is often reserved for systems that can oscillate freely without applied forces. Sometimes these vibrations cause minor or serious performance or safety problems in engineered systems. For instance, when an aircraft ...
... when it is forced to do so externally, the term “vibration” in mechanical engineering is often reserved for systems that can oscillate freely without applied forces. Sometimes these vibrations cause minor or serious performance or safety problems in engineered systems. For instance, when an aircraft ...
Experimental determination of natural frequency and damping ratio
... The vibration that takes place under the excitation of external forces is called forced vibration. If excitation is harmonic, the system is forced to vibrate at excitation frequency. If the frequency of excitation coincides with one of the natural frequencies of the system, a condition of resonance ...
... The vibration that takes place under the excitation of external forces is called forced vibration. If excitation is harmonic, the system is forced to vibrate at excitation frequency. If the frequency of excitation coincides with one of the natural frequencies of the system, a condition of resonance ...
Electron spin resonance study of copper(II) hydrogenmalonate dihydrate complex S. M
... The second term defines an additional contribution to Δ appearing at low temperatures, when the long-range magnetic order is approached. It is caused by fluctuations of the staggered magnetization in the short-range ordered state. These enhance the spin–spin relaxation rate 1/ 2 and, consequently, a ...
... The second term defines an additional contribution to Δ appearing at low temperatures, when the long-range magnetic order is approached. It is caused by fluctuations of the staggered magnetization in the short-range ordered state. These enhance the spin–spin relaxation rate 1/ 2 and, consequently, a ...
Get PDF - OSA Publishing
... The master laser is a home-built ECDL. The single-mode diode (Sheaumann M9-940-0200D5P) is collimated with an aspheric lens. A diffraction grating (Thorlabs GH13-18U, 1800 lines/mm, efficiency ≈ 30 %) in the Littrow configuration provides feedback. The grating and collimation package are held and al ...
... The master laser is a home-built ECDL. The single-mode diode (Sheaumann M9-940-0200D5P) is collimated with an aspheric lens. A diffraction grating (Thorlabs GH13-18U, 1800 lines/mm, efficiency ≈ 30 %) in the Littrow configuration provides feedback. The grating and collimation package are held and al ...
PPT file - INFN-LNF
... PHARAO performances: frequency instability lower than 3∙10-16 at one day and inaccuracy at the 10-16 level. The short term frequency instability will be evaluated by direct comparison to SHM. The long term instability and the systematic frequency shifts will be measured by comparison to ultra-stable ...
... PHARAO performances: frequency instability lower than 3∙10-16 at one day and inaccuracy at the 10-16 level. The short term frequency instability will be evaluated by direct comparison to SHM. The long term instability and the systematic frequency shifts will be measured by comparison to ultra-stable ...
Resonance
In physics, resonance is a phenomenon that occurs when a given system is driven by another vibrating system or external force to oscillate with greater amplitude at a specific preferential frequency.Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies, or resonance frequencies. At resonant frequencies, small periodic driving forces have the ability to produce large amplitude oscillations. This is because the system stores vibrational energy.Resonance occurs when a system is able to store and easily transfer energy between two or more different storage modes (such as kinetic energy and potential energy in the case of a pendulum). However, there are some losses from cycle to cycle, called damping. When damping is small, the resonant frequency is approximately equal to the natural frequency of the system, which is a frequency of unforced vibrations. Some systems have multiple, distinct, resonant frequencies.Resonance phenomena occur with all types of vibrations or waves: there is mechanical resonance, acoustic resonance, electromagnetic resonance, nuclear magnetic resonance (NMR), electron spin resonance (ESR) and resonance of quantum wave functions. Resonant systems can be used to generate vibrations of a specific frequency (e.g., musical instruments), or pick out specific frequencies from a complex vibration containing many frequencies (e.g., filters).The term Resonance (from Latin resonantia, 'echo', from resonare, 'resound') originates from the field of acoustics, particularly observed in musical instruments, e.g. when strings started to vibrate and to produce sound without direct excitation by the player.