scholarly journals A Nonintrusive Rotor Blade Vibration Monitoring System

1996 ◽  
Author(s):  
Henry Jones
Keyword(s):  
Rotor Blade ◽  
Rotating Machinery ◽  
Vibration Monitoring ◽  
Static Deflection ◽  
Blade Vibration ◽  
Turbine Engine ◽  
Measurement Systems ◽  
Timing Data ◽  
On Line ◽  
Engine Rotor

A technique for measuring turbine engine rotor blade vibrations has been developed as an alternative to conventional strain-gage measurement systems. Light probes are mounted on the periphery of the engine rotor casing to sense the precise blade passing times of each blade in the row. The timing data are processed on-line to identify (1) individual blade vibration amplitudes and frequencies, (2) interblade phases, (3) system modal definitions, and (4) blade static deflection. This technique has been effectively applied to both turbine engine rotors and plant rotating machinery.

scholarly journals Data Management Techniques for Blade Vibration Analysis

2016 ◽  
Vol 37 (1) ◽  
pp. 95-132 ◽  
Author(s):  
Radosław Przysowa ◽  
Aleksander Tuzik
Keyword(s):  
Data Structures ◽  
Vibration Analysis ◽  
Flexible Tool ◽  
Blade Vibration ◽  
Report Generation ◽  
Measurement Systems ◽  
File Formats ◽  
Timing Data ◽  
Complex Measurement ◽  
Management Techniques

Abstract Well-designed procedures are required to handle large amounts of data, generated by complex measurement systems used in engine tests. The paper presents selected methodologies and software tools for characterisation and monitoring of blade vibration. Common file formats and data structures as well as methods to process and visualise tip-timing data are discussed. Report Generation Framework (RGF) developed in Python is demonstrated as a flexible tool for processing and publishing blade vibration results.

scholarly journals Turbine Blade Vibration Monitoring System

1992 ◽  
Author(s):  
T. Kawashima ◽  
H. Iinuma ◽  
T. Wakatsuki ◽  
N. Minagawa
Keyword(s):  
Gas Turbine ◽  
Monitoring System ◽  
Turbine Blade ◽  
Optical Fibers ◽  
Cooling System ◽  
Vibration Monitoring ◽  
Turbine Engines ◽  
Gas Temperature ◽  
Blade Vibration ◽  
Turbine Engine

This paper describes a development and an evaluation of an optical blade vibration monitoring system applicable to gas turbine engine high pressure turbine blading. The system uses high intensity He-Ne lasers, optical fibers and associated electronics, and can monitor rotor blade vibration under engine running conditions. With a combined water and air probe cooling system, it can be used for monitoring turbine blade vibration at 1300 degree C range gas temperature. The system was applied to actual gas turbine engines and has demonstrated it’s effectiveness as a useful tool for gas turbine blade vibration evaluation.

Turbine Engine Health/Maintenance Status Monitoring with Use of Phase-Discrete Method of Blade Vibration Monitoring

2009 ◽  
Vol 147-149 ◽  
pp. 530-541 ◽  
Author(s):  
Miroslaw Witoś ◽  
Ryszard Szczepanik
Keyword(s):  
Energy State ◽  
Turbine Blades ◽  
Short Review ◽  
Vibration Monitoring ◽  
Fatigue Wear ◽  
Compressor Blades ◽  
Blade Vibration ◽  
Health Maintenance ◽  
Turbine Engine ◽  
Aero Engines

The intended aim of the paper was to present a short review of more than 15 years of experience of ITWL in the field of applying the signal of actual rotational speed (aperiodic and oscillation components thereof) to the expert diagnosing of aero-engines, including identification of low- and high-cycle fatigue (LCF, HCF) of critical structural members. What has been presented is some essential metrological bearings of the non-contact technique of measuring the engine’s rpm with some flexible key phasors (i.e. vibrating compressor/turbine blades). Also, methods of numerical analysis of measuring signals, in use nowadays, have been discussed. With the jet engine of the SO-3 type (in use on the TS-11 “Iskra” combat trainer) as an example, are discussed algorithms of both the identification of disadvantageous aeromechanical effects (energy state of the engine - i.e. the source of accelerated HCF wear of structural components) and the early detection of symptoms of fatigue failures to compressor blades and the bearing system. The discussed problems have been illustrated with examples selected as to emphasise practicalities of applying a new source of diagnostic information to ‘actively’ control the process of fatigue wear (HCF + LCF) of engine components and to forecast the engine health/maintenance status.

scholarly journals Utilization of Fast Response Pressure Measurements to Non-Intrusively Monitor Blade Vibration in Axial Compressors

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Yujun Leng ◽  
Nicole L. Key
Keyword(s):  
Pressure Wave ◽  
Rotor Blade ◽  
Fourier Transforms ◽  
Pressure Sensors ◽  
Vibration Monitoring ◽  
Pressure Waves ◽  
Blade Vibration ◽  
Monitoring Method ◽  
Deflection Amplitude ◽  
Casing Pressure

Abstract A novel non-intrusive method has been developed to monitor rotor blade vibration using unsteady casing pressure. The present blade vibration monitoring technique utilizes casing unsteady pressure sensors that can detect the pressure waves associated with blade vibration. Spinning mode theory was used to identify the specific frequencies and nodal diameters (NDs) of the spinning pressure waves associated with the blade vibration. A dual temporal-spatial analysis method has been developed to extract the specific frequency components using Fourier transforms, and the specific ND component was extracted using a circumferential mode-fitting algorithm. An experimental study was done in the Purdue 3-stage axial research compressor to verify the new rotor blade vibration monitoring method against the blade tip timing (BTT) method. During the experiment, the compressor was swept through the resonant crossing speed corresponding to the first torsion (1T) vibratory mode of the embedded rotor, while the unsteady casing pressure data and BTT data were simultaneously acquired. Utilizing as few as two sensors, the pressure wave due to blade forced vibration was extracted. A constant scaling factor between the resultant pressure wave strength and blade deflection amplitude was calculated for two different loading conditions. The close match between blade vibration-generated pressure wave strength and blade deflection amplitude through the resonant range provides the validation for the new rotor blade vibration monitoring method. This is the first time in the open literature that blade vibration-related pressure waves have been extracted from casing pressure sensor arrays and used to quantify blade vibration.

Real Time Flutter Monitoring System for Turbomachinery

2004 ◽  
Author(s):  
Harbans S. Dhadwal ◽  
Marc Radzikowski ◽  
Dmitri Strukov ◽  
Anatole Kurkov
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Magnetic Bearing ◽  
Vibration Monitoring ◽  
Time Interval ◽  
Real Time Processing ◽  
Arrival Times ◽  
Timing Data ◽  
On Line ◽  
Blade Tip

A fiber optic laser probe based system is described for real time monitoring of flutter in rotating turbomachinery. The digital flutter monitoring system is designed for continuous processing of blade tip timing data at a rate of 10 MB/s. A USB2.0 interface provides un-interrupted real time processing of the data. The blade tip arrival times are measured with a 50 MHz bscillator and a 24-bit pipelined counter architecture. A graphical user interface provides on-line interrogation of any blade tip from any light probe sensor. Alternatively, data from all blades can be superimposed into a single composite scatter plot displaying the vibration amplitude of each blade. A hardware platform was developed to simulate a seventy two bladed turbine operating at 15,000 rpm. Blade tip responses from three light probes were generated in an infinite loop, providing reproducible and controlled conditions for testing the vibration monitoring system. Time interval measurements were consistently made with a single count error in a 24-bit count vector. Real time testing was done using a two blade rotor mounted in an evacuated chamber at the Spin Rig Facility at the NASA Glen Research Center. The shaft in this facility was suspended by two radial magnetic bearings and the nonsynchronous vibration was communicated to the blades through the magnetic bearing. The shaft motion was much smaller than the blade vibratory amplitude, realistically simulating flutter vibrations. Nonsynchronous vibratory amplitudes for the first mode were of the order of twenty mils and for the second mode of the order of a few mils.

scholarly journals New blade tip-timing system for measuring rotor blade vibration of steam and gas turbines

2019 ◽  
Vol 137 ◽  
pp. 01040
Author(s):  
Piotr Kowaleczko ◽  
Romuald Rządkowski ◽  
Leszek Kubitz ◽  
Paweł Troka ◽  
Paweł Kowaleczko ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Rotor Blade ◽  
Low Cost ◽  
Blade Vibration ◽  
Measurement Systems ◽  
Timing System ◽  
Blade Vibrations ◽  
Blade Tip ◽  
Run Up ◽  
Ethernet Interface

One of the crucial issues regarding turbine maintenance is registering blade vibrations. These vibrations can cause serious damage to the engine. Turbine blade vibrations were measured during nominal speed as well as during run up and run down. A new, low cost Blade Tip Timing (BTT) is presented in this paper. It composes of two main modules: the FPGA unit and PC unit. The system is based on the TerasIC DE0-CV development board controlled by the Cyclone V 5CEBA4F23C7 chip. Units communicate via an Ethernet interface. The system measures a signal for every revolution as well as up to three signals coming from independent rotor blade sensors. The PC unit records these data in .csv files. The system can be adapted to process the signals of additional sensors. The measurements of the 1st stage compressor blade vibrations in an SO-3 engine prove that the system works correctly, with no data loss during transmission between system units, and compares well with other measurement systems as well as numerical results.

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