Study on vibration characteristics of mistuned bladed disk

2018 ◽  
Vol 2018 (0) ◽  
pp. 429
Author(s):  
Yasutomo KANEKO ◽  
Asakichi MURAKAMI ◽  
Toshio WATANABE ◽  
Shigetoshi MAEDA ◽  
Saiji WASHIO
Keyword(s):  
Vibration Characteristics ◽  
Bladed Disk

scholarly journals Investigation of vibration characteristics for bladed-disks with dry friction nonlinearity

2018 ◽  
Vol 207 ◽  
pp. 04009
Author(s):  
Tianyuan Liu ◽  
Yonghui Xie ◽  
Di Zhang
Keyword(s):  
Dry Friction ◽  
Normal Load ◽  
Frequency Domain Analysis ◽  
Friction Model ◽  
Load Level ◽  
Vibration Characteristics ◽  
Lumped Parameter Model ◽  
Qualitative Assessment ◽  
Bladed Disk ◽  
Harmonic Equation

This paper focuses on the vibration characteristics of the bladed-disk subjected to the dry friction damping under periodic excitation. Firstly, the multi-harmonic equation basing on the frequency-domain analysis is established to predicate the steady response of the bladed-disk. Then, the algorithm to solve the nonlinear multi-harmonic balance equation is given step by step. In the numerical simulation, a simplified lumped parameter model of a turbine bladed-disk as well as the elastic Coulomb friction model between the root and disk contacting surfaces are applied. The normal load level of the friction interfaces, which are the focal points of the bladed-disk design, is analysed for the nonlinear vibration characteristics of the blades. The results show that vibration response of bladed-disk is affected significantly by normal load, and there exists an optimal value of the normal load under the operating condition of the turbomachinery, which can provide a qualitative assessment for the design practice of friction dampers.

Effect of Bladed Packets on Transient Vibration Localization Behaviors of Mistuned Whole Bladed Disk System

2021 ◽  
Author(s):  
Xuanen Kan
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Vibration Energy ◽  
Disk System ◽  
Transient Vibration ◽  
Vibration Localization ◽  
Bladed Disk ◽  
Alternative Approach

Abstract The multi-packets whole bladed disks are usually used in the turbo-machineries. The most different characteristic of the multi-packets whole bladed disk is that some blades are connected by lacing forming a bladed packet, and several bladed packets are assembled to form a multi-packets whole bladed disk system. Mistuning of blades is an attractive vibration subject due to vibration localization problems that vibration energy focuses on some blades. The vibration localization characteristics of steady state of bladed disk are mainly discussed in previous studies, and few works focus on the transient vibration localization behaviors of the multi-packets whole mistuned bladed disk. Transient vibration characteristics of bladed disk are crucial during startup. Therefore, in this paper, transient vibration characteristics of the multi-packets whole bladed disk are studied. A developed mathematical model is used to calculate the transient vibration response of the multi-packets whole bladed disk. The number of bladed packets on the transient vibration localization of the multi-packets mistuned whole bladed disk is discussed. The results indicate that the bladed packets are able to reduce the transient vibration localization. The results suggest that the bladed packet is an alternative approach to reduce the vibration localization of bladed disk caused by mistuning. Moreover, the different number of bladed packets will produce various behaviors of transient vibration localization of multi-packets whole mistuned bladed disk system.

scholarly journals Study on Vibration Characteristics of Mistuned Bladed Disk(Vibration Response Analysis by Reduced Model FMM)

2013 ◽  
Vol 7 (4) ◽  
pp. 328-342 ◽  
Author(s):  
Yasutomo KANEKO ◽  
Ryota NAKANISHI ◽  
Kazushi MORI ◽  
Hiroharu OHYAMA
Keyword(s):  
Vibration Characteristics ◽  
Vibration Response ◽  
Reduced Model ◽  
Response Analysis ◽  
Bladed Disk

scholarly journals Study on Influence of Multi-Parameter Variation of Bladed Disk System on Vibration Characteristics

2021 ◽  
Vol 11 (7) ◽  
pp. 3084
Author(s):  
Honggang Pan ◽  
Yunshi Wu ◽  
Tianyu Zhao
Keyword(s):  
Finite Element ◽  
Vibration Mode ◽  
Fine Sand ◽  
Structure Design ◽  
Vibration Characteristics ◽  
Disk System ◽  
Element Analysis ◽  
Bladed Disk ◽  
Rotor Disk ◽  
Aero Engines

As the main components of the rotor system of aero-engines and other rotating machinery equipment, the bladed disk system has high requirements on its structure design, safety and stability. Taking the rotor disk system of aero-engines as the research object, modal calculation of the rotor disk system was based on the group theory algorithm, and using the fine sand movement on the experimental disk to express the disk vibration shape. The experimental vibration mode is used to compare with the finite element calculation results to verify the reliability of the finite element analysis. Study on the effect of dissonance parameter changes on the bladed disk system vibration characteristics concluded that the vibration mode trends of the blisk system and the disc are, basically, consistent. As the mass of the blade increases, the modal frequencies of the entire blisk system gradually decrease, and the amplitude slightly increases. When the mass increases at different parts of the blade, the effect on the modal frequencies of the bladed disk system are not obvious. When the bladed disk system vibrates at low frequency, the disc will not vibrate and each blade will vibrate irregularly. The bladed disk should be avoided to work in this working area for a long time, so as not to cause fatigue damage or even fracture of some blades.

Vibration Characteristics of Aircraft Engine-Bladed-Disk Assembly

1986 ◽  
Vol 36 (1) ◽  
pp. 9-26 ◽  
Author(s):  
J. S. Rao ◽  
C. B. Shah ◽  
Ch. L. Ganesh ◽  
Y.V.K.S. Rao
Keyword(s):  
Aircraft Engine ◽  
Vibration Characteristics ◽  
Bladed Disk ◽  
Bladed Disk Assembly
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