Papers by Keyword: Nonlinear Damping

Abstract: This study evaluates hybrid fluid viscous damper (FVD) layouts for seismic control of a 20-storey reinforced-concrete tower. Two retrofit configurations (C1, C2), each employing 120 FVDs with a combined damping capacity of approximately 60,000 kN·s/m per configuration, were modelled in ETABS as nonlinear link elements and subjected to nonlinear time-history analyses using representative ground motions. Device constitutive behavior was represented by a velocity-dependent law and model verification included explicit link spring/area settings to prevent silent unit-scaling of damper properties. Both hybrid layouts substantially reduce peak inter-story drifts and increase system energy dissipation, though performance varies by direction: relative to the undamped frame, C1 reduced peak drift by ≈28.7% in X and ≈44.6% in Y, while C2 reduced peak drift by ≈26.2% in X and ≈53.9% in Y. Damper contribution to seismic energy dissipation reached ≈47.3% for C1 and ≈45.6% for C2, with total (structural plus device) dissipation of ≈52.4% and ≈55.6%, respectively. Directional asymmetry is attributed to modal shapes and damper distribution. The results indicate that carefully arranged hybrid FVD systems can deliver significant, orientation-aware improvements to seismic resilience.

Abstract: The present situation of damping capacity for magnesium alloys test techniques and its equipment were reviewed. Because there were many types of test equipment, So it pointed out the suitability of all testing equipment and schemes for damping testing of magnesium alloys. And based on the research results of dislocation damping mechanism of magnesium alloys. The author holds that test scheme for torsional deformation of torsion pendulum and test scheme for bending and shearing deformation of dynamic thermal mechanical analyzer meet high-precision test requirements for non-linear damping capacity of magnesium alloys. The study make great value for testing damping of magnesium alloys and reflecting their damping advantage.

Abstract: In this paper the asymptotic stability of global solutions to the initial-boundary value problem for some nonlinear wave equation with nonlinear damping and source terms is studied by using a difference ineauality.

Abstract: Stability of implicit midpoint algorithm applied to solving the equation of motion with nonlinear damping. The analytical and numerical study exhibit the unconditional stability of implicit midpoint scheme for nonlinear damping systems. The work of the present paper provides theoretic base for further application of this implicit midpoint approach.

Abstract: The hysteresis dynamic behavior of metal rubber mathematically modeled with a practical method is studied, and the method of parameter separated identification is presented with details. Parameters of the model are identified with the test data of metal rubber, from which the theoretical loops are reconstructed, and the mechanism of the nonlinear damping behavior of the metal rubber is investigated. The theoretical loops and the experimental one are close to each other with satisfactory accuracy. The result shows that with the simple mathematical form and the satisfactory precision, the mixed damping model can be used effectively in practical engineering. This study provides a practical and effective method in modeling and the parameter identification of the metal rubber isolator.

Abstract: The work reported in this paper describes the behavior and prediction of damping properties of the 3D composite laminated engine mount shell structure. The shell structure has a shape of box with four vertical and two horizontal plates with the thickness of 15mm and 20mm respectively. For more accurate prediction of the structural behavior, many researchers have incorporated the time dependent property of the material into their field of studies. In this article the finite element approach utilizes the concept of viscoelastic damping, which is carried out by direct integration. This paper describes the potential application of composite material as a damper device because of its damping, high stiffness and low weight properties, which favor the use as engine mount in submarine and ships where weight is the highest priority.