Dynamic Characteristics Analysis of H-class Gas Turbines Foundation Based on Response Surface Methodology

  Introduction   The paper aims to study the dynamic performance of the H-class gas turbine foundation， obtain the relationship between the key influencing parameters and the basic performance of the gas turbine， and guiding the parameters selection and engineering design.

  Method   The foundation thickness of H-class gas turbine， concrete elastic modulus， unbanlance force and damping ratio were selected as the key influencing parameters， and the three-dimensional finite element model of H-class gas turbine foundation was established through ANSYS， and the harmonic response analysis method was used to obtain the dynamic amplitude of the foundation under the unbanlance force.

  Result   Through a large number of finite element calculation and analysis， the response surface about the maximum control amplitude of the H-class gas turbine foundation，the thickness of the foundation and the elastic modulus of concrete presents an S-shaped curved surface， which has relatively flat ends and rapid growth in the middle； The amplitude of the basic control point of the gas turbine increases proportionally with the increase of the unbanlance force. While the amplitude change caused by the damping change is not monotonous， and the increase of the damping may increase or decrease its amplitude.

  Conclusion   In engineering design analysis， the parameters of appropriate foundation thickness， concrete elastic modulus， unbanlance force and damping ratio should be selected based on specific engineering data and design conditions， which is the prerequisites to obtain correct and reliable dynamic performance analysis and gas turbine foundation design.