scholarly journals A Comparative Study of Four Parametric Hysteresis Models for Magnetorheological Dampers

Actuators ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 257
Author(s):  
Hongzhan Lv ◽  
Qi Sun ◽  
W. J. Zhang
Keyword(s):  
Comparative Study ◽  
Creep Behavior ◽  
Dynamic Models ◽  
Complex Dynamics ◽  
Magnetorheological Damper ◽  
Nonlinear Creep ◽  
Test Apparatus ◽  
Low Velocity ◽  
Hysteresis Characteristics ◽  
Velocity Region

The dynamics of the magnetorheological damper is complex, including the inherent hysteresis characteristics and nonlinear creep behavior in the low-velocity region. Mathematical models for these complex dynamics are very important to the function of the damper. In this paper, a comparative study of the four parametric dynamic models, which are the hysteresis bi–viscous model, viscoelastic-plastic model, Bouc–Wen model, and improved Bouc–Wen model, is performed. The study includes the building of a common test apparatus and the parameter identification for the four models. The comparison of the four models concludes that (1) all four models are comparative and that (2) the improved Bouc–Wen model has the highest accuracy.

The Creep Behavior of a Floating Beam

1983 ◽  
Vol 27 (04) ◽  
pp. 271-280
Author(s):  
Paul C. Xirouchakis
Keyword(s):  
Cross Section ◽  
Creep Behavior ◽  
Failure Time ◽  
Failure Criteria ◽  
Secondary Creep ◽  
Nonlinear Creep ◽  
Double Membrane ◽  
Creep Response ◽  
Distributed Load ◽  
Linear Viscoelastic

The creep response is obtained for an inhomogeneous beam, with simple end supports, resting on a liquid foundation and subjected to a sinusoidally distributed load. The Norton-Bailey constitutive equations are used to describe secondary creep behavior and elastic effects are retained. The liquid foundation is taken as a continuous Winkler support. The beam cross section is replaced by a double-membrane model. The implications are discussed of using stress or deflection failure criteria in determining the magnitude of the instantaneous breakthrough load. The linear viscoelastic as well as nonlinear creep beam response is obtained explicitly. The influence of the beam geometric and material characteristics and of the presence of the liquid foundation on the growth of the deflections with time is discussed. The variation of the breakthrough load with failure time is also explored. Results obtained are compared with available sea ice laboratory test data.

scholarly journals Structure of accretion flows in the nova-like cataclysmic variable RW Tri

2020 ◽  
Vol 497 (2) ◽  
pp. 1475-1487
Author(s):  
G Subebekova ◽  
S Zharikov ◽  
G Tovmassian ◽  
V Neustroev ◽  
M Wolf ◽  
...  
Keyword(s):  
Binary Systems ◽  
Cataclysmic Variable ◽  
Low Velocity ◽  
Time Resolved ◽  
Narrow Component ◽  
Accretion Flows ◽  
Photometric Observations ◽  
Hα Emission ◽  
Usual Interpretation ◽  
Velocity Region

ABSTRACT We obtained photometric observations of the nova-like (NL) cataclysmic variable RW Tri and gathered all available AAVSO and other data from the literature. We determined the system parameters and found their uncertainties using the code developed by us to model the light curves of binary systems. New time-resolved optical spectroscopic observations of RW Tri were also obtained to study the properties of emission features produced by the system. The usual interpretation of the single-peaked emission lines in NL systems is related to the bi-conical wind from the accretion disc’s inner part. However, we found that the Hα emission profile is comprised of two components with different widths. We argue that the narrow component originates from the irradiated surface of the secondary, while the broader component’s source is an extended, low-velocity region in the outskirts of the accretion disc, located opposite to the collision point of the accretion stream and the disc. It appears to be a common feature for long-period NL systems – a point we discuss.

A Comparative Study of the Variable Screening and Hartree-Fock Models as Means for the Construction of Two-Center Correlation Diagrams

1995 ◽  
Vol 60 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Jan Lörinčík ◽  
Rudolf Polák ◽  
Zdeněk Šroubek ◽  
Ivana Paidarová
Keyword(s):  
Comparative Study ◽  
Low Velocity ◽  
Variable Screening ◽  
Hartree Fock ◽  
Screening Model ◽  
Computing Correlation ◽  
Shell Vacancy

The aim of this work is to test the Variable Screening Model (VSM) [Wille U., Hippler R.: Phys. Rep. 132, 129 (1986)] as a method for computing correlation diagrams of neutral and ionized diatomic quasimolecules by comparing the results with corresponding Hartree-Fock calculations, and to elucidate the specific features of both aforementioned approaches in applications to given purpose. These calculations serve as the first step in the interpretation of inner-shell vacancy production in low-velocity ion-atom collisions inside bombarded solids.

A simultaneous inversion of seismic traveltimes and amplitudes for velocity and attenuation

Geophysics ◽  
1996 ◽  
Vol 61 (6) ◽  
pp. 1738-1757 ◽  
Author(s):  
Don W. Vasco ◽  
John E. Peterson ◽  
Ernest L. Majer
Keyword(s):  
Perturbation Approach ◽  
Well Log ◽  
Ray Theory ◽  
Fracture Zones ◽  
Low Velocity ◽  
Simultaneous Inversion ◽  
Attenuation Structure ◽  
Paraxial Ray ◽  
The Relationship ◽  
Velocity Region

It is possible to efficiently use traveltime and amplitude information to infer variations in velocity and Q. With little additional computation, terms accounting for source radiation pattern and receiver coupling may be included in the inversion. The methodology is based upon a perturbation approach to paraxial ray theory. The perturbation approach linearizes the relationship between velocity deviations and traveltime and amplitude anomalies. Using the technique, we infer the velocity and attenuation structure at a fractured granitic site near Raymond, California. A set of four well pairs are examined and each is found to contain two zones of strong attenuation. The velocity variations contain an upper low velocity region corresponding to the uppermost attenuating zone. The location of these zones agrees with independent well‐log and geophysical data. The velocity and attenuation anomalies appear to coincide with extensively fractured sections of the borehole and may indicate fracture zones rather than individual fractures.

scholarly journals A three-dimensional study of a crustal low velocity region beneath the 9°03′N overlapping spreading center

2003 ◽  
Vol 30 (2) ◽  
Author(s):  
S. Bazin ◽  
A. J. Harding ◽  
G. M. Kent ◽  
J. A. Orcutt ◽  
S. C. Singh ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Spreading Center ◽  
Low Velocity ◽  
Velocity Region
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