Based on lacing wires influence of coupling vibration of a multi flexible disks turbine rotor system by two methods

Abstract

This paper explored the blade-bending, disk-transverse and shaft-torsion coupling vibrations phenomenon of a multi flexible disc rotor system, whose blades subsystem was grouped with spring. Being different from the author's previous researches, here we used two methods: one is the assumed mode method (AMM) and the other is the finite element method (FEM), the proposed former one is main, and the latter one is complementary. Then compared the two results generated from them. According to the authors' previous definition, a flexible disc rotor system displays three coupling vibrations' types, inter-blade (BB), shaft-disk-blade (SDB) and disk-blade (DB) modes. In this paper, the authors additionally defined two new types, which were called lacing wires-blade (LB) and lacing wires-disk-blade (LDB) mode. The system change rules of natural frequencies and that of mode shapes would be discussed. Some interesting results are shown in this paper. Firstly, the author pointed out the change rules of the mode shapes and natural frequencies by using the AMM and FEM (including three kinds of softwares). Secondly, numerical calculation results also showed that the distance of disk, the disk with flexible, the constant of spring, and location of spring four phenomena would affect the natural frequencies.

Exploration of coupled-vibration phenomena in multi-disk rotor with blades with multi-cracks

“…In Zhou and colleagues, 21,22,29 the authors used three kinds of FEM software to simulate a rotor system. Based on the results in those references, the authors found ANSYS software to be most accurate and observed that errors using ANSYS were less than 1%.…”

“…Chiu and Huang 20 explored how a crack affects these three types of coupled-vibrations type tuning a shaft-flexible disk-blade system. Recently, Zhou et al 21 and Chiu et al 22 used the FEM to investigate a single-/multi-flexible disk rotor with springs and compared their results with earlier research results.…”

Vibration Analysis of Turbine Rotor System

“…The authors [5][6] used assumed mode method (AMM) and the finite element method (FEM) to investigate a single/multi flexible disk system with lacing wires. The modal analysis of a small turbocharger rotor system are carried out in this paper…”