A linear system was analysed and a solution obtained by assuming the resulting vibration response to comprise of 1× and 2× components. Sekhar and Prabhu investigated the effects of flexible-coupling misalignment on the vibrations of a rotor-bearing system. It was reported early in that the existence of this instability can cause noticeable noise, severe mechanical shakes and premature fatigue failures in shafts, gear teeth etc. It was found that the dynamic instability of the system and the fluctuating part of the axial force has caused the regions of the dynamic instability with increasing amplitude of the fluctuation. The steady-state response, resonance and dynamic instability were investigated in a rotating Timoshenko shaft with rigid unsymmetrical disc subjected to a periodic axial force as a parametrically excited system using Finite Element Method.
MECHANIC MME EFFECT CRACKED
However, In the case of the rotating shafts interconnected with joint parametric instability in a rotating shaft system may be a result of the asymmetric shaft, anisotropic bearing, cracked shaft, the applied a periodic variation of velocity ratio and the angular misalignment. Various research has been conducted to study the dynamic stability of the shaft interconnected through a joint. After unbalance, coupling misalignment is the most common fault present in rotating machines. The performance of the universal transmission system can be often impacted by the presence of faults and needs to be considered during the design process. The universal joint or Hooke’s joint is used for the power transmission when the input shaft is misaligned with the output shaft it is one of the main components of the transmission system. The universal joint system, as one of the critical components of mechanical components, is often used in rotating mechanical equipment, such as the automobile industry. Finally, the experimental results were informative for the transient response exploration and comparable to the theoretical findings for validating the proposed twin-rotor model. Subsequently, the experimental analysis conducted equally indicated that the quantitative relation between the faults and the performance of the transmission is impacted by the time-varying stiffness and is the main cause of the frequency-modulated feature in the Cardan shaft system. It is also found that the passage of the cracked primary shaft near to an integral multiple of the critical speed leads to the phenomenon of sup-harmonic resonance.
MECHANIC MME EFFECT CRACK
The analysis demonstrated that the crack parameters in the input shaft tend to inhibit the occurrence of unstable oscillations in lateral deflection, orbit and frequency spectrum of the secondary response. The highly oscillated feature of the rotors system is theoretically obtained and experimentally analysed. The nonstationary response of a cracked rotor system in the presence of unbalance has been evaluated using orbit patterns and Fast Fourier Transform. To study the sensitivity of the crack for a rotating shaft, the model is enriched by considering the periodical feature of the time-varying stiffness deriving from the crack breathing model. Using energy principle and a Lagrangian transformation, the governing equation of the propeller shaft system is established by considering a nonlinear elastic shaft time-dependent perturbation. This paper presents a theoretical and experimental analysis of a coupled lateral and torsional vibrations of two identical rotors interconnected by a flexible Hooke’s joint and modelled as a multibody system with a small misalignment angle.