The vibration performance is critical to the suspension control and torque precision of magnetically suspended momentum flywheel (MSMW). translational torsional MSMW are investigated in this article, damping regulation method proposed improve anti-vibration MSMW. Firstly, modellings MSMW, including dynamic models displacement coordinate, developed, comprehensive characteristics investigated. Mo...

Torsional vibrations of composite poroelastic dissipative spherical shell are investigated in the framework of Biot’s extension theory.Here composite poroelastic spherical shell consists of two spherical shells, one is placed on other, and both are made of different poroelastic materials. Consideration of the stress-free boundaries of outer surface and the perfect bonding between two shells lea...

the cadaver spine motion segment behavior under torsional load was evaluated with the disc intact, with partial anterior discectomy and with spacer insertion. the results of this study explain how anterior lumbar discectomy and interbody fusion (alif) affects the torsional stability of the motion segment. the pseudarthrosis rate of the anterior lumbar discectomy and interbody fusion (alif) is k...

The problem of coupled flexural-torsional nonlinear vibrations of a piezoelectrically-actuated microcantilever beam as a typical configuration utilized in microcantilever-based sensing is being investigated. The actuation and sensing are both facilitated through bonding a piezoelectric layer (here, ZnO) on the microcantilever surface. Considering different geometrical configurations for the bea...

This study deals with the optimisation of hybrid composite drive shafts operating at subcritical or supercritical speeds, using a genetic algorithm. A formulation for the flexural vibrations of a composite drive shaft mounted on viscoelastic supports including shear effects is developed. In particular, an analytic stability criterion is developed to ensure the integrity of the system in the sup...

Abstract This paper presents a study of viscous torsional vibration damper for crankshaft four-stroke diesel engine. The reliable operation widely used silicone-type depends on the ability silicone oil to absorb energy vibrations. non-Newtonian shear flow interlayer, characterised by reduction in shear-rate-dependent viscosity and moment drag forces, negatively affects damping characteristics. ...