Abstract A damping fuzzy proportional-integral-derivative (PID) control method for electronically controlled air suspension shock absorbers was proposed to reduce the RMS values of body vibration acceleration and improve vehicle ride comfort. Depending on operating mode absorber, a mechanical model absorber established. PID technology is designed by combining algorithm with concept. The adaptiv...

This paper investigates the use of order-tuned absorbers to attenuate vibrations of flexible blades in a bladed disk assembly subjected to engine order excitation. The blades are modeled by a cyclic chain of N oscillators, and a single vibration absorber is fitted to each blade. These absorbers exploit the centrifugal field arising from rotation so that they are tuned to a given order of rotati...

We present a study of the nature of warm absorbers on the basis of ROSAT X-ray observations and photoionization calculations carried out with the code Cloudy. We focus on ‘non-standard’ warm absorbers: (i) the proposed dusty warm absorbers in IRAS 13349+2438 and IRAS 17020+4544, and possibly in 4C+74.26, (ii) we explore several scenarios to account for the recently observed peculiar absorption ...

Spectroscopy of ten quasars obtained with the Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST) is presented. We detect 357 absorption lines above a significance level of 3σ in the ten sightlines, and 272 lines above a significance level of 4.5σ. Automated software is used to detect and identify the lines, almost all of which are unresolved at the GHRS G140L resolu...

This paper aims to study the vibration of large inertial platform from Laser + Gamma building that is part ELI-NP project. In order ensure a precisely positioned radiation beam, it necessary shocks and vibrations coming external environment are damped or absorbed until they reach work installations. ensured by on which devices positioned, supported spring batteries shock absorbers. A rigid body...

To study the nature of low z Lyα absorbers in the spectra of QSOs, we have obtained high signalto-noise UV spectra of H 1821+643 (zem = 0.297) and PG 1116+215 (zem = 0.177) with the Goddard High Resolution Spectrograph on the Hubble Space Telescope. The spectra have minimum S/N ∼ 70-100 and 3σ limiting equivalent widths of 50-75 mÅ at a resolution of ∼150 km s. Excluding lines within 3000 km s ...

One way to characterize and understand H I-selected galaxies is to study their metallicity properties. In particular, we show that the metallicity of absorbers is a bivariate function of the H I column density (NH I) and the Mg II equivalent width (W λ2796 r ). Thus, a selection upon W r is not equivalent to a H I selection for intervening absorbers. A direct consequence for damped absorbers wi...

We use the observed number and column-density distributions of intergalactic O VI absorbers to constrain the distribution of metals in the low-redshift intergalactic medium (IGM). In this simple model the metals in the O VI absorbers are assumed to be produced in and propagated from lowredshift galaxies drawn from a real sample, in this case the Sloan Digital Sky Survey (SDSS). This model can e...