Results 21 to 30 of about 2,760,319 (175)

Experimental and Numerical Study of Nonlinear Vibration in Compressor Stator Blade with Holding Ring Structure Considering Contact Friction

Applied Sciences, 2023
At present, there are very few vibration test designs for compressor stator blades in damped blade test research, and there is a lack of consideration of the holding ring structure of the blade installation.
Jiaobin Ma, Zhufeng Liu, Yonghui Xie, Di Zhang   +3 more
doaj   +1 more source

Non-Contact Measurement of Blade Vibration in an Axial Compressor [PDF]

Sensors, 2019
Complex blade responses such as a rotating stall or simultaneous resonances are common in modern engines and their observation can be a challenge even for state-of-the-art tip-timing systems and trained operators. This paper analyses forced vibrations of axial compressor blades, measured during the bench tests of the SO-3 turbojet.
Radoslaw Przysowa, Peter Russhard
openaire   +3 more sources

Dynamic Response of a Composite Fan Blade Excited Instantaneously by Multiple MFC Actuators

Aerospace, 2022
The vibration characteristics of a composite fan blade are much more complex than those of a solid titanium fan blade due to the anisotropic material properties and complex excitations coming from unsteady flow and mechanically induced vibration. In this
Yong Chen, Lu Jin, Xu Tang, Dandan Huang, Jiguo Zhang   +4 more
doaj   +1 more source

Non-Intrusive Measurement of Blade Tip Vibration in Turbomachines [PDF]

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General, 1991
It is discussed the need for non-intrusive monitoring of rotating blade vibration. The advantages over conventional techniques are outlined. The vibration of a compressor blade has been investigated by strain gages, with particular attention to time evolution of the frequency spectra, at different operating speeds of the machine.
L. Andrenelli, N. Paone, ROSSI, Gianluca, E. P. Tomasini   +3 more
openaire   +2 more sources

An Improved Circumferential Fourier Fit (CFF) Method for Blade Tip Timing Measurements

Applied Sciences, 2020
Rotating blade vibration measurements are very important for any turbomachinery research and development program. The blade tip timing (BTT) technique uses the time of arrival (ToA) of the blade tip passing the casing mounted probes to give the blade ...
Zhibo Liu, Fajie Duan, Guangyue Niu, Ling Ma, Jiajia Jiang, Xiao Fu   +5 more
doaj   +1 more source

Turbocharger blade vibration: Measurement and validation through laser tip-timing [PDF]

, 2012
High Cycle Fatigue (HCF) of turbine blades is a major cause of failure in turbochargers. In order to validate changes to blades intended to reduce fatigue failure, accurate measurement of blade dynamics is necessary. Strain gauging has limitations, so an
Allport, John, M.L. Jupp, P. Olley, Jupp, Martyn, A.J. Day, A. Pezouvanis, J.M. Allport, B. Mason, Institution of Mechanical Engineers, G.W. Janicki, M.K. Ebrahimi, A.I. Pierończyk   +11 more
core   +1 more source

CALIBRATION OF BTT MEASUREMENT WITH RESPECT TO SENSOR POSITION OVER SHROUDED LSB

Acta Polytechnica CTU Proceedings, 2018
In order to increase efficiency and reliability of steam turbines, last stage blades are equipped with mid-span tie-boss and shroud. We can use Blade Tip-Timing method (BTT) to measure vibration of shrouded blades, but the measured level of vibration is ...
Tereza Dadáková, Zdeněk Kubín
doaj   +1 more source

An Improved Blade Vibration Parameter Identification Method considering Tip Clearance Variation

Shock and Vibration, 2021
Blade tip timing (BTT) technology is the most effective means for real-time monitoring of blade vibration. Accurately extracting the time of blade tip reaching the sensors is the key to ensure the accuracy of the BTT system. The tip clearance changes due
Liang Zhang, Qidi Wang, Xin Li
doaj   +1 more source

Deep Learning for Compressed Sensing-Based Blade Vibration Reconstruction From Sub-Sampled Tip-Timing Signals

IEEE Access, 2023
Blade tip-timing (BTT) signals are always seriously under sampled, so reconstruction is much needed for vibration analysis. Blade vibration responses are sparse in order domain and classical compressed sensing (CS) algorithms are difficult to reconstruct
Zhongsheng Chen, Hao Sheng, Lianying Liao, Chengwu Liu, Yeping Xiong   +4 more
doaj   +1 more source

Simulating eddy current sensor outputs for blade tip timing

Advances in Mechanical Engineering, 2018
Blade tip timing is a contactless method used to monitor the vibration of blades in rotating machinery. Blade vibration and clearance are important diagnostic features for condition monitoring, including the detection of blade cracks.
Nidhal Jamia, Michael I Friswell, Sami El-Borgi, Ralston Fernandes   +3 more
doaj   +1 more source