بررسي تجربي و عددي استفاده از جداكننده‌هاي پايه در حفاظت لرزه‌اي از ماشين‌هاي‌دوار انعطاف‌پذير

of rotordynamic systems, especially in critical industrial applications such as gas turbines, oil pumps, gas compressors, an‎d power plant generators operating in seismically active regions. These vibrations can lead to intensified dynamic responses, increased transient loads on bearings, rotor imbalance, reduced component life, an‎d even unexpected shutdown. The use of elastomeric vibration isolators as a protective solution, with the aim of reducing the transfer of seismic energy from the base to the rotating system, can effectively mitigate these problems an‎d increase the stability of the system. In this study, the seismic response of a rotating machinary with an‎d without the use of a base isolator has been investigated analytically an‎d experimentally. The numerical model of the rotor was developed using the finite element method an‎d the effects of mass, stiffness, damping an‎d gyroscopic effects were included in the equations of motion. To analyze the time response of the system under seismic excitation, the Newmark-beta integration method was used an‎d the base isolator was modeled as linear spring-damper elements in both horizontal an‎d vertical directions. Experimental tests were carried out on a shaking table with swept harmonic excitation an‎d the time acceleration indices, root mean square (RMS) value, peak value an‎d frequency response function (FRF) were measured. In order to validate the numerical model, the simulation results were compared with experimental data. In the fixed base case, a part of the input energy (about 30 to 65%) is dissipated through the inherent damping of the system; however, in the isolated case, the acceleration transmitted to the bearings is significantly less than in the fixed base case. The numerical model was in good agreement with the experimental results. Parametric studies also showed that increasing the height of the isolator an‎d using silicone-based material enhanced vibration mitigation.

سعيد ضيائي راد

رضا تيكني , نيما نوري