Open AccessNatural Frequency Evaluation of Last Stage Steam Turbine Blade Power Plant Using Finite Element Method
Author(s) -
A M Kokong,
T Widjayanto,
Hery Setiawan,
A R Laksana,
Imam Djunaedi
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1096/1/012092
Subject(s) - natural frequency , blade (archaeology) , turbine blade , turbine , engineering , steam turbine , finite element method , structural engineering , modal analysis , power (physics) , rotational speed , frequency response , mechanical engineering , acoustics , vibration , electrical engineering , physics , quantum mechanics
The possibility of a power plant trip can disrupt the stability of the network frequency settings. Load shedding is done at the frequency level. In case of frequency under nominal setting, the load shedding or trip generator decision must pay attention to the generator equipment factor, especially the last stage turbine blade and lacing wire. In this study analysis modal using ANSYS 2019 R2 was carried out to determine natural frequency of the last stage blade LP (low pressure) Steam Turbine Tanjung Awar Awar Indonesia power plant when operating at low frequencies, which is below the nominal operating frequency of 50 HZ or at a rotation of 3000 rpm. The finite element method analysis is applied to the 1 blade and 5 blade systems. The result for a natural frequency of 1 blade system occurs at 2639.6, 2783 and 2915 rpm. For the 5 blades system, natural frequency occurs at 2648 and 2563 rpm, so it can be concluded that the setting under frequency is not in the range of natural frequency last stage LP turbine blade, and lacing wire damage is not triggered by the natural frequency steam turbine blade.