Directional vibrations (i.e., directional swaying mode motions and/or torsional mode motions) exist widely in many civil structures such as high-rise buildings and offshore platforms which are exposed to random dynamic loads like winds or ocean currents. These motions may result in directional damages (e.g., fatigue damages) of these structures. Thus, there is a need to identify such directiona...

Many of the papers studying the screw-drive system dynamic model concentrated on the control methodologies that is why vibrational models are either simple lumped models or simplified flexible beam models. In this paper a screw-drive system dynamic model and its vibrations are discussed. The screw is considered as an EulerBernoulli type flexible beam with fixed-free boundary conditions and the ...

The oil and gas industry has a growing demand for electrically driven trains operated at variable speeds. Variable frequency electrical drives enable increased operational flexibility and energy efficiency. This is of great importance in applications requiring high power, such as gas compression. Load commutated inverters (LCIs) are one of the most widespread technologies for driving large gas ...

The control problem of the two-mass system originally derives from rolling-mill drives (Sugiura & Hori, 1996), (Ji & Sul, 1995), (Szabat & Orlowska-Kowalska, 2007). Large inertias of the motor, rolls and long shaft create an elastic system. The motor speed is different from the load side and the shaft undergoes large torsional torque. A similar problem exists in the field of conveyer drives (Ha...

Introduction. Torsional vibrations caused by drilling using a polycrystalline diamond compact (PDC) bit are analysed wellbore data obtained under various modes. The torsional analysed. Two types of vibrations, including those the cutting action and frictional forces. Aim. To investigate induction as result rock destruction PDC bits. Materials methods. research methodology was based on “Richard-...

Elastomers have wide and ever increasing applications in several industries. For example, elastomeric bushings are used in automotive suspension systems to reduce amplitude of vibrations as well as shocks. In this study, a compressible visco-hyperelastic approach is employed to investigate the behavior of these bushings. Time-discrete form of the material model (Exp–Ln visco-hyperelastic model)...

The article considers methods for studying torsional vibrations of the wheel-motor block a diesel locomotive UZTE16M. locomotives in question were modernized at structural enterprise “O’ztemiryo’lmashta’mir” (Machine building and repair Uzbekistan Railways company) under joint-stock company “O’zbekiston temir yo’llari” (Uzbekistan railways). authors developed dynamic model analysis vibrational ...