NEHRP Clearinghouse
- Title
- Study of Seismic Response of Rotating Machines Subjected to Multi-Component Base Excitations.
- File
- PB92188135.pdf
- Author(s)
- Chang, T. S.; Singh, M. P.
- Source
- National Science Foundation, Washington, DC., May 1992, 114 p.
- Identifying Number(s)
- VPI-E-92-11
- Abstract
- The rotating machines like motors, generators, pumps and turbines are commonplace in modern industrial and power generation facilities. The failure of these machines during an earthquake can disrupt the functioning of these facilities, which can have serious operational and safety consequences. In the study, the response behavior of rotating machines subjected to random, multi-component base motions is examined. A response spectrum method is developed to calculate the seismic design response of machines for seismic inputs defined in terms of the base motion response spectra. The contributions of various terms in the equations of motion which complicate the response analysis are carefully evaluated to see if they can be eliminated to simplify the analysis. The numerical study shows that the contribution of the real eigenproperties of the machines can be ignored. Also, in most cases of a machine placed on the ground directly or installed in a building with torsional response, the effect of the rotational components of the input motion at the base of the machine can be ignored in the calculation of the machine response. However, in the cases where the rotational components are expected to be very strong, the proposed response spectrum approach can still be used.
- Keywords
- ; Equations of motion; Seismic waves; Turbomachinery; Rotary stability; Mathematical models; Earthquake damage; Mechanical properties; Vibration damping; Displacement; Seismic effects; Rotating electrical machines