Dynamic response analysis of mechanical structures is usually performed by adopting numerical/analytical models. Finite element (FE) modeling as a numerical approach plays an important role in dynamic response analysis of complex structures. The calculated dynamic responses from FE analysis are only reliable if accurate FE models are used. There are many elements in real mechanical structures w...

Abstract With the continuous increase of unit capacity and widespread application series compensation devices in power transmission systems, risk coupling oscillation between units grids has increased significantly, which seriously endangers safe operation grids. In this paper, torsional vibration response each after grid failure is calculated by establishing a lumped mass model shafting parall...

This presentation investigates Active Structural Acoustic Control (ASAC) of rotating machinery with high modal density, by placing actuators as close as possible to the noise source. For this purpose, an experimental set-up has been built, as discussed in [3]. The set-up consists of a shaft supported by two bearings, of which one is made “active” by mounting piezo-actuators around it, to influe...

Active Structural Acoustic Control (ASAC) tries to reduce the radiated sound by actively influencing the dynamics of a structure. The main idea behind this research is to apply ASAC by acting on the structure as close as possible to the noise source, in order to cancel the vibration energy as soon as possible in the transfer path. For the considered application of gear noise, an experimental se...

Most electric power is produced by steam turbines. This is because the steam cycle is well suited to the conversion of heat to work and steam turbines can be built in a wide range of capacities up to about 1500 MW. Steam turbines are basically very simple having fixed blades to accelerate the steam and moving blades to absorb the resulting kinetic energy. The moving blades are mounted on a rota...

This paper presents an approach to calculate the equivalent stray capacitance (SC) of n-turn of the helical flux compression generator (HFCG) coil with multi layer conductor wire filaments (MLCWF) in the form of rectangular cross-section. This approach is based on vespiary regular hexagonal (VRH) model. In this method, wire filaments of the generator coil are separated into many very small simi...

In this study, an analytical model is developed to study crack breathing behavior under the effect of crack location and unbalance force. Crack breathing behavior is determined using effectual bending angle by studying the transient change in closed area of the crack. The status of the crack of a balanced shaft is symmetrical about shaft rotational angle and the duration of each crack status re...

The main contribution of this paper is to propose new control techniques which not only provide fault tolerance capabilities to the WT system, but also improve the overall performance of the system in both fault free and faulty conditions. Coupled nonlinear aero-hydro-servo-elastic simulations of an offshore wind turbine with jacket platform are carried out. The proposed controllers are based i...

The major aim for achieving the successful synchronization of a wind turbine system to grid is mitigate electrical and mechanical stresses on generator. During transient state, gearbox, shaft, rotor generator could be damaged due stress. stator windings generator, including its insulation, affected. This paper undertakes an extensive analysis effects excitation parameters power converter Insula...