ASME QME-1-2000 pdf – Qualification of Active Mechanical Equipment Used in Nuclear Power Plants.
correlation coefficient: the correlation coefficient funclion defines a comparative relationship between two time histories. It provides a statistical estimate of how much two motions are related as a function of time delay. The numerical range is from zero for unrelated, to ±1.0 for related motions.
cutoff frequency: the frequency in the response spectrum where the Zero Period Acceleration asymptote essentially begins. This is the frequency beyond which the single-degree-of-freedom oscillators exhibit very little or no amplification of motion, and indicates the upper limit of the frequency content of the waveform being analyzed.
cycle. one complete sequence of values of an alternating quantity.
damping: a generic name ascribed to the energy dissipation mechanisms or small, otherwise unrepresented nonlinearilies that reduce the amplification and broaden the vibratory response in the region of resonance. One hundred percent critical clamping is defined as the least amount of equivalent viscous damping that causes a single-degree-of-freedom system to return to its original position without oscillation after initial disturbance.
device: an item that is used in connection with, or as an auxiliary to, other items of equipment on which it may he mounted.
effective mass: the mass of the structure or equipment that participates in determining the dynamic response of the structure or equipment.
effective mass ratio: the ratio of the effective mass considered in the response to the total effective mass for the equipment or structure.
equipment: see definition in Section QR.
equipment, candidate: see definition in Section QR.
equipment, exible: equipment. including the effects of the equipment supports. the lowest natural frequency of which is less than the frequency value at the start of the ZPA (Zero Period Acceleration) or the cutoff frequency of the applicable response spectrum.
equipment, parent: see definition in Section QR.
equipmeiit, rigid: equipment, including the effects of the equipment supports, the lowest natural frequency of which is greater than the frequency value at the start of the ZPA (Zero Period Acceleration) or the cutoff frequency of the applicable response spectrum.
equivalent static load: an equivalent statically applied load or acceleration based on a function of the peak of the applicable response spectrum that may be used as an alternative to response spectrum or time history to define seismic input for design of equipment.
floor acceleration: the acceleration of a particular building floor (or equipment mounting) resulting from the motion of a given earthquake. The maximum floor acceleration is the ZPA of the floor response spectrum.
foundation: a structure that supports or otherwise provides restraint to equipment and buildings.
Fourier spectrum: a complex valued function that provides an1plitude and phase information as a function of frequency for a time domain waveform.
fragility: susceptibility of equipment to malfunction as a result of structural or operational limitations or both when subjected to dynamic excitation.
fragility level: the highest level of excitation parameters that equipment can withstand and still perform the specified functions (note that the fragility level may include the interdependence of amplitude, frequency, and time).
fragility response spectrum: a TRS (test response spectrum) that defines the fragility level of the equipment.
generic equipment ruggedness spectrum: a composite response spectrum based on experience for which a class of similar equipment has been demonstrated to have sufficient ruggedness to perform its specified function.