Vibration fault identification of a turbojet engine based on cepstrum analysis

2021 ◽  
pp. 095441002110477
Author(s):  
Jingjing Huang ◽  
Xijun Zhang
Keyword(s):  
Vibration Analysis ◽  
Frequency Component ◽  
Fault Identification ◽  
Complex Signals ◽  
Vibration Data ◽  
Engine Vibration ◽  
Cepstrum Analysis ◽  
Turbojet Engine ◽  
Analysis Technique ◽  
Periodic Components

A vibration fault identification method based on vibration state characteristics of a turbojet engine and cepstrum analysis technology was proposed in this paper, and the application of cepstrum in vibration analysis of an aero-engine was also discussed. The vibration data of the turbojet engine in three different test cases of 0.8 rated state, max power state, and afterburning state were analyzed using the cepstrum analysis method. The periodic components and the characteristics of multi-component side-frequency complex signals in the dense overtone vibration signals were separated and extracted, which reflected the sensitivity of the positions of the compressor casing and the turbine casing to the harmonic vibration components of high- and low-pressure rotors and the characteristic difference of different vibration parts. Thus, effective identification of vibration faults was achieved. The results shows that the cepstrum analysis technique applied to the vibration analysis of the turbojet engine can better identify the sideband components of the frequency domain modulated signal and enhance the recognition capability of the fault frequency component, which is helpful to identify the engine vibration fault quickly and accurately.

scholarly journals Condition monitoring of PARR-1 rotating machines by vibration analysis technique

2014 ◽  
Vol 29 (3) ◽  
pp. 249-252 ◽  
Author(s):  
Javed Qadir ◽  
Hameed Qaiser ◽  
Mehar Ali ◽  
Masood Iqbal
Keyword(s):  
Condition Monitoring ◽  
Preventive Maintenance ◽  
Vibration Analysis ◽  
Research Reactor ◽  
Vibration Spectrum ◽  
Experimental Setup ◽  
Performance Parameters ◽  
Vibration Data ◽  
Analysis Technique ◽  
Vibration Signatures

Vibration analysis is a key tool for preventive maintenance involving the trending and analysis of machinery performance parameters to detect and identify developing problems before failure and extensive damage can occur. A lab-based experimental setup has been established for obtaining fault-free and fault condition data. After this analysis, primary and secondary motor and pump vibration data of the Pakistan Research Reactor-1 were obtained and analyzed. Vibration signatures were acquired in horizontal, vertical, and axial directions. The 48 vibration signatures have been analyzed to assess the operational status of motors and pumps. The vibration spectrum has been recorded for a 2000 Hz frequency span with a 3200 lines resolution. The data collected should be helpful in future Pakistan Research Reactor-1 condition monitoring.

scholarly journals Research on Transfer Characteristics of Engine Vibration Load to Cabin Seat

2020 ◽  
Vol 38 (6) ◽  
pp. 1163-1170
Author(s):  
Juncheng Shu ◽  
Erming He ◽  
Jinxiang Yi ◽  
Pengxiang Chen
Keyword(s):  
Vibration Isolation ◽  
Vertical Direction ◽  
Frequency Component ◽  
Vertical Acceleration ◽  
Load Spectrum ◽  
Contribution Rate ◽  
Vibration Transmission ◽  
Vibration Load ◽  
Engine Vibration ◽  
Double Beam

Aeroengine is one of the main vibration sources that affect the passenger comfort. The contribution of engine vibration to the vibration response of seat will provide basic data for the design of airliner vibration comfort and engine vibration isolation installation. Firstly, the dynamical model of middle fuselage compartment with double-beam wing was established. Then, based on the typical vibration load spectrum of the engine, the acceleration responses of the key nodes of the wing beam and the seat connection points were analyzed, and the main path of engine vibration transmission to seats was identified. Finally, using operational transfer path analysis (OTPA) method, the contribution of engine front and rear mount point vibration to the vertical acceleration response of the seats was compared, and the three-dimensional information of wing structure vibration transmission was explored. The results show that the fundamental frequency component of low-pressure rotor of engine vibration has the greatest impact on the seat vertical response under takeoff and cruise conditions, the contribution rate of the front mount point vibration is about 71% and 67% respectively. However, the fundamental and its 3/2 times frequency components of high-pressure rotor have relatively large impact on the seats vertical response under flight idle state, and the contribution rate of engine front mount point vibration is about 45% and 60% respectively. In addition, the engine vibration is mainly transmitted from the wing front beam to the seat vertical response. The vertical direction of the wing beam and the rotation direction around the fuselage are also the main direction of vibration transmission.

Study of Bolt Model to Improve Accuracy of Engine Vibration Analysis

2010 ◽  
Author(s):  
Yoshisada Sakamoto ◽  
Shozo Kawamura ◽  
Yoshihiko Sunayama
Keyword(s):  
Vibration Analysis ◽  
Engine Vibration ◽  
Improve Accuracy

A Framework for Novelty Detection in Jet Engine Vibration Data

2007 ◽  
Vol 347 ◽  
pp. 305-310 ◽  
Author(s):  
David A. Clifton ◽  
Peter R. Bannister ◽  
Lionel Tarassenko
Keyword(s):  
Novelty Detection ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Analysis Framework ◽  
Vibration Data ◽  
Engine Vibration ◽  
Detection Approach ◽  
On Line ◽  
High Integrity ◽  
Line Analysis

A novelty detection approach to condition monitoring of aerospace gas-turbine engines is presented, providing a consistent framework for on- and off-line analysis, each with differing typical implementation constraints. On-line techniques are introduced for observing abnormality in engine behaviour during aircraft flights, and are shown to provide early warning of engine events in real-time. Off-line techniques within the same analysis framework are shown to allow the tracking of single engines and fleets of engines from ground-based monitoring stations on a flight-by-flight basis. Results are validated by comparison to conventional techniques, in application to aerospace engines and other industrial high-integrity systems.

Periodic and Continuous Vibration Monitoring for Preventive/Predictive Maintenance of Rotating Machinery

1987 ◽  
Vol 109 (2) ◽  
pp. 159-167 ◽  
Author(s):  
W. C. Laws ◽  
A. Muszynska
Keyword(s):  
Vibration Analysis ◽  
Continuous Monitoring ◽  
Cost Effective ◽  
Predictive Maintenance ◽  
Vibration Monitoring ◽  
Alternative Methods ◽  
Monitoring Systems ◽  
High Quality ◽  
Analysis Techniques ◽  
Vibration Data

The application of vibration monitoring as part of Preventive/Predictive Maintenance programs is discussed. Several alternative methods, including periodic and continuous monitoring techniques, are described. Emphasis is given to the importance of selecting vibration transducers with due regard for the specific machinery type. The equally important need to install monitoring systems which are cost effective and provide genuinely useful information for maintenance engineers and vibration analysts is also highlighted. It is argued that critical machinery should be monitored continuously, and in cases when more detailed investigation is required that high-quality Predictive Maintenance vibration analysis techniques be applied. The need is also emphasized for specialist interpretation of vibration data in order to identify specific machinery malfunctions, of which several examples are given.

A Harmonic Wavelets Approach for Extracting Transient Patterns From Measured Rotor Vibration Data

2001 ◽  
Author(s):  
Valeta Carol Chancey ◽  
George T. Flowers ◽  
Candice L. Howard
Keyword(s):  
Vibration Analysis ◽  
Transient Effects ◽  
Rotor Vibration ◽  
Harmonic Wavelets ◽  
Vibration Data ◽  
Harmonic Wavelet ◽  
Vibration Signature ◽  
The Fourier Transform ◽  
Traditional Approaches

Vibration analysis is a powerful diagnostic tool for rotating machinery problems. Traditional approaches to vibration signature analysis have focused on the Fourier transform, which tends to average out transient effects. Recent work in the area of wavelets has allowed for the characterization of signals in frequency and in time, which, if properly interpreted, can provide substantial insight, particularly with regard to transient behaviors. There are many different wavelets, but the harmonic wavelet was developed specifically for vibration analysis. It uses an algorithm based upon the FFT, which makes it particularly attractive to many in the vibration analysis community. This paper considers the harmonic wavelet as a tool for extracting transient patterns from measured vibration data. A method for characterizing transient behaviors using the harmonic wavelet is described and illustrated using simulation and experimental results.

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