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Inertial elastic instability of rotating nano disks

100%

Güven U.

tom Vol. 57 nr 4

853--858

In this work, the static inertial-elastic instability of rotating nano disks is investigated with the centrifugal force formulation considering the radial displacement. Thus, Brunelle’s previous local solution is generalized by using Eringen’s nonlocal elasticity theory. The variations of critical rotation speeds with the nonlocal scale parameter are illustrated under different boundary conditions. It is seen that the critical rotation speeds decrease as the nonlocal scale parameters increase for all cases. Also, it is remarkable that the presented results are affected significantly from the boundary conditions.

Rascetnye i eksperimental'nye issledovania dinamiceskih harakteristik rotorov centrobeznyh nasosov s opornymi podsipnikami skol'zenia na perekacivaemaj srede

100%

Tsoma O. , Los D. , Orlov O.

2008

tom Z. 10, Vol. 1

125-134

Results of design investigations of free flexural vibrations of multistage centrifugal ring section pumps rotors with inboard journal bearings on pumped medium and results of experimental investigations for determination of critical speeds of these pumps rotors are given. The investigation were carried out using various design models and design methods and various measuring systems. They showed that rotors of the pumps designs being investigated were flexible.

Osobennosti proektirovania centrobeznyh kompressorov c aktivnymi magnitnymi podsipnikami

100%

Gadiaka V. , Panenko V.

2008

tom Z. 10, Vol. 1

181-187

Some features of dynamic calculations at design are considered, and also the problems, related to balancing of rotors of centrifugal compressors which the active magnetic bearing are used.

Implementing SimulationX in the modelling of marine shafting steady state torsional vibrations

88%

Vulić N. , Bratić K. , Lalić B. , Stazić L.

Polish Maritime Research

2021

tom nr 2

63--71

Marine propulsion shafting systems are exposed to torsional vibrations originating from excitations in their prime movers and propellers. It is essential to analyse their steady state response in the earliest stage of ship design. The paper describes the implementation of SimulationX software based upon simulation modelling for these calculations. This software can be used either by the design office of the shipyard or by the classification society for verification within the plan approval phase. Some specifics of the input data preparation are briefly discussed. In addition, the simulation results depend on the modelling approach chosen. For these reasons, the real two-stroke Diesel engine ship propulsion system was chosen and several different models were implemented for system modelling. SimulationX calculation results are compared with those of two well-known and field-proven programs that use an analytical approach. Finally, the results are compared with the measurements performed on the actual newly built ship. Discussion reviews the selected SimulationX model, and its verification and validation in the case of engine cylinders with normal ignition.