317 SUMMARY Magnetic suspension technology has advanced to the point of being able to offer a number of advantages to a variety of applications in the rotating machinery and aerospace fields. One strong advantage of magnetic bearings over conventional bearings is the decrease in power consumption. The use of permanent magnets, along with electromagnets, is one appealing option which can further...

This study is devoted towards evaluating seismic performance of a three-span continuous highway bridge subjected to moderate to strong earthquake ground motions in its longitudinal direction. In this regard, nonlinear dynamic analysis of the bridge based on the direct time integration approach using the 4 order Runge-Kutta method is conducted. Two types of isolation bearings are used in the ana...

Due to bolt looseness or operating ambient temperature, fit clearance can often be found between the outer ring and housing. The vibration characteristics of a cylindrical roller bearing with localized defects are greatly affected by accuracy fault diagnosis may reduced. Thus, mathematical model for was constructed interaction housing described. classical were modeled, such as inner defect, def...

in the current study the effect of casimir force and squeezed film damping on the pull-in instability and dynamic behavior of electrostatically actuated nano and micro electromechanical systems is investigated separately. linear elastic membrane theory is used to model the static and dynamic behavior of system for strip, annular and disk geometries. squeezed film damping effect is modeled using...

In view of the weak isolation and shock absorption effect ordinary bearings at present, a new track damping negative-stiffness device was designed based on principle negative stiffness. The stiffness applied to base isolation, system proposed in which track-type NSD common layer were connected parallel. had characteristics clear force transmission, simple structure, self-resetting ability. theo...

To facilitate the damping matching of dampers for vehicle passive suspensions, this paper proposes an analytical matching method of the optimal piecewise linear damping characteristics curve. Based on the vehicle vibration model, taking the suspension dynamic deflection as the constraint, by the vibration acceleration and the wheel dynamic load, an objective function about the relative damping ...

This paper aims to investigate the combined effects of working condition and structural parameters groove texture on dynamic characteristics, stability unbalance response a water-lubricated hydrodynamic bearing–rotor system avoid instability excessive vibration rotor. The Navier–Stokes equation, standard K-? model with enhanced wall treatment Zwart–Gerber–Belamri cavitation are considered using...

Propeller-induced longitudinal vibration resonance in marine propulsion shafting systems causes great harm to the hull structure and is primary source of shipboard noise. Integrating a friction damper with designed parameters into thrust bearings can prevent these issues. To investigate performance damper-integrated bearing transmission control, an experimental theoretical study carried out lab...