This paper "described the measurement of frequency response function (FRF) of this system and the average linearization method under random exciting condition.The paper also analysed the ultra low frequency characteristics of this vibration system and gave a relation between FRF curves of various exciting signal levels and average times,and the modal parameter identification results.
These factors include the nonlinearity of suspension spring, the nonlinearity of damping force and the nonlinearity of driving force, etc, in which suspension spring and damping force are main factors that influence the distortion of ultra-low-frequency vibrator.
This paper introduces the principle and test technology of the tan δ test at 0 1 Hz very low frequency (VLF) voltage. This is a new method for XLPE/PE cables on site test. Using this method to measure tan δ , the cables overall defaults can be detected sensitively.
The paper describes the advantages and the new development of 0.1Hz very low frequency voltage test on stator windings of HV electrical machine,at the same time,a very low frequency 0.1Hz voltage test equipment developed by authors is presented.
Two times ln SDANN is a goodsurrogate for ln ultra low frequency power and can be compared with published cut points.
Ultra low frequency electromagnetic wave anomaly and its spectrum characteristics before earthquakes
Many observations and researches show that abundant and intense ultra low frequency (ULF) electromagnetic anomalies appeare before local earthquakes.
The near-field ultra low frequency (ULF) waves generated by P(t) give SES reciprocally proportional to the distance R.
A quantitative study of observations of the ionospheric signatures of magnetospheric ultra low frequency (ULF) waves by a high-latitude (geographic: 69.6°N 19.2°E) high-frequency Doppler sounder has been undertaken.
Nonlinear propagation of ultra-low-frequency electromagnetic modes in a magnetized dusty plasma
A theoretical investigation has been made of nonlinear propagation of ultra-low-frequency electromagnetic waves in a magnetized two fluid (negatively charged dust and positively charged ion fluids) dusty plasma.
Ultra-low-frequency electrostatic and electromagnetic modes in self-gravitating magnetized dusty plasmas
A theoretical investigation has been made of ultra-low-frequency dust-electrostatic and dust-electromagnetic modes, propagating perpendicular to the external magnetic field, in a self-gravitating, warm, magnetized, two fluid dusty plasma system.
It has been shown that the effects of self-gravitational field and dust thermal pressure significantly modify the dispersion properties of these ultra-low-frequency dust-modes.
In healthy individuals, the peak oxygen consumption closely correlated with the HR variability, the very low frequency component at TL, and physical capacity.
The total RR-interval spectrum power (800 ± 98 ms2) in the TGs of the native population is shifted to the very low frequency band (VLF, 52%), which indicates predomination of the humoral-metabolic HR regulation level.
Exploration of the extension of two lava tubes, faults and dikes using very low frequency-electromagnetic technique in NE Jordan
The very low frequency-electromagnetic (VLF-EM) technique was used to delineate two sub-parallel lava tubes, faults and dikes in Umm El-Quttein area, NE Jordan.
The following time domain measures and spectral components were calculated: mean RR, SDNN, SDANN, RMSSD, SDNN index, pNN50, and very low frequency (VLF), low frequency (LF) and high frequency (HF) spectral components.