Long service time and excessive vibration of aero-engine will cause failure clamps, which usually fix pipelines on the outside an aero-engine. In this paper, nonlinear characteristics caused by loosening clamps in pipeline are determined. According to real parameters clamp-pipeline test rig, clamp is simplified into a spring-damping. Thus, model based cubic stiffness established. The multi-scal...

damping of a full-scale cable with a pair of passive–on magnetorheological (mr) dampers was tested. a cable of 215.58m long with the first mode frequency of 0.658hz was tensioned horizontally in cable prefabrication factory. two mr dampers were attached to the cable in an angle in the plane perpendicularly to the cable axis in 5m length from the cable anchorage. the applied voltage level was 0v...

In the present paper, we study Cauchy problem for wave equation with a time-dependent scale invariant damping term 21+t?tv and cubic convolution (|x|???v2)v ??(?12,3) in three spatial dimension initial data (v(x,0),?tv(x,0))?C2(R3)×C1(R3) compact support, where v=v(x,t) is an unknown function to on R3×[0,T). Here T denotes maximal existence time of v. The first aim paper prove unique global (in...

We study the nonequilibrium diffusion dynamics of supersonic lattice solitons in a classical chain of atoms with nearest-neighbor interactions coupled to a heat bath. As a specific example we choose an interaction with cubic anharmonicity. The coupling between the system and a thermal bath with a given temperature is made by adding noise, delta correlated in time and space, and damping to the s...

In the current study the influence of weight percentage of HIPS, weight percentage of CNT and hardener content on damping 1st and damping 2nd properties of epoxy/HIPS/CNT hybrid composite wase valuated. Mixture design methodology was employed to generate mathematical models for predicting damping 1st and damping 2nd behaviors of new mentioned hybrid nanocomposite as function of physical factors...

We study the bifurcations of slow-fast cycles with two canard points in singularly perturbed planar systems. After analyzing local dynamics lying on S-shaped critical manifolds, we give a sufficient condition under which there exist three hyperbolic limit bifurcating from some cycles. The proof is based geometric singular perturbation theory. Then, apply results to cubic Liénard equations quadr...

This paper describes dynamic analysis using proposed fast finite element method for a shock absorbing structure including a sponge. The structure is supported by nonlinear concentrated springs. The restoring force of the spring has cubic nonlinearity and linear hysteresis damping. To calculate damping properties for the structures including elastic body and porous body, displacement vectors as ...

in the present paper the behavior of an elastically mounted cylinder in low and high mass-damping ratio is investigated. for high mass-damping ratio, a classical wake oscillator model is used. at the first, by neglecting all damping and nonlinear terms of this model, the possibility of using a linear model for determination of the lock-in range and the dominant mode is investigated. then, witho...

Fluidelastic instability of a single flexible cylinder subject to fluid cross flow has been investigated in arrays of rigid tubes arranged in a normal triangular configuration with pitch ratios of and . The test facility designed and built for this purpose has two novel features: (i) the flexible tube is supported by a linear structure which allows only pure translation of the tube in a directi...