Five Pad Tilting Pad Bearing Design and Lateral Vibration Characteristics of Small Gas Turbine Supported by It and Roller Bearing

2011 ◽  
Author(s):  
Jin Woong Ha ◽  
Ji Ho Myung ◽  
Jhin Ik Suk
Keyword(s):  
Rigid Body ◽  
Gas Turbine ◽  
Dynamic Properties ◽  
Roller Bearing ◽  
Rigid Body Mode ◽  
Conical Shape ◽  
Tilting Pad ◽  
Bearing Design ◽  
Industrial Gas Turbine ◽  
Selection Of

In tilting pad bearing design process, the selection of the proper configuration type of either a Load-Between-Pad (LBP) or Load-On-Pad (LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the static and dynamic characteristics of a five pad tilting pad bearing for the LBP and LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5 MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by its asymmetric dynamic properties.

Updating the ANSI Standard on Measurement of Exhaust Emissions

1994 ◽  
Author(s):  
J. M. Vaught
Keyword(s):  
Gas Turbine ◽  
Exhaust Emissions ◽  
Measurement Methods ◽  
National Standards ◽  
Turbine Engines ◽  
Measurement Technology ◽  
Gas Turbine Engines ◽  
Regulatory Requirements ◽  
Industrial Gas Turbine ◽  
Selection Of

The American National Standards Institute (ANSI) required that the source testing Standard on Measurement of Exhaust Emissions from Stationary Gas Turbine Engines, B133.9, be brought up to date with today’s regulatory requirements and best measurement technology. The criteria for the design of the Standard along with its content and format are discussed. The selection of measurement methods for gaseous components, smoke, and particulates emitted by present day emission controlled industrial gas turbine engines is presented.

Updating the ANSI Standard on Measurement of Exhaust Emissions

1995 ◽  
Vol 117 (3) ◽  
pp. 563-568
Author(s):  
J. M. Vaught
Keyword(s):  
Gas Turbine ◽  
Exhaust Emissions ◽  
Measurement Methods ◽  
National Standards ◽  
Turbine Engines ◽  
Measurement Technology ◽  
Gas Turbine Engines ◽  
Regulatory Requirements ◽  
Industrial Gas Turbine ◽  
Selection Of

The American National Standards Institute (ANSI) required that the source testing Standard on Measurement of Exhaust Emissions from Stationary Gas Turbine Engines, B133.9, be brought up to date with today’s regulatory requirements and best measurement technology. The criteria for the design of the Standard along with its content and format are discussed. The selection of measurement methods for gaseous components, smoke, and particulates emitted by present-day emission-controlled industrial gas turbine engines is presented.

Vibration Measurement Techniques on an Industrial Gas Turbine Rotor Train

1998 ◽  
Author(s):  
Stefan S. Florjancic ◽  
Wes Franklin ◽  
Noel Lively
Keyword(s):  
Gas Turbine ◽  
Support System ◽  
Data Reduction ◽  
Dynamic Properties ◽  
Measurement Techniques ◽  
Turbine Rotor ◽  
Vibration Measurement ◽  
Analytical Models ◽  
System Parameters ◽  
Industrial Gas Turbine

The rotordynamic behavior of an industrial gas turbine rotor train was assessed on site, and the sensitivity to unbalance was quantified. An outline of the measurement procedure is given. Differential data reduction with test unbalances was undertaken to minimize the influence of measurement uncertainty. A test unbalance was installed for one run and then shifted by 180° for the consecutive run. With differential data, the effective dynamic properties of the rotor - support - system can be estimated more accurately. A rotordynamic model was used to identify the support system parameters based on measured data. For the analysis, the anisotropic, elliptical vibration orbits were decomposed into two counter-rotating circular orbits, and the support system parameters identified match the originally predicted values well. The methods of differential data reduction, rotor train mode shape presentation, elliptical orbit decomposition, and the link of measurement to analytical models with parameter definition are described. Examples from on-site measurements are included for illustration.

Lubrication Mode and Selection of the Helicopter Transmission System Roller Bearing

2011 ◽  
Vol 86 ◽  
pp. 156-161
Author(s):  
Jun Peng Qiu ◽  
Mei Yin ◽  
Ling Song Guo
Keyword(s):  
Roller Bearing ◽  
Essential Element ◽  
Transmission System ◽  
Bearing Life ◽  
Lubrication Mode ◽  
Bearing Design ◽  
Helicopter Transmission ◽  
Design And Manufacture ◽  
Normal Work ◽  
Selection Of

The bearings will directly affect the performance of helicopter transmission system whether they are in normal work or not. Lubrication is the essential element for the normal work of bearings. Under the condition of the bearing design and manufacture technique, material technique is becoming more and more advanced, and lubricant becomes “the fifth main part”, which has been got a wide-ranged agreement. One of the most critical factors to improve bearing life is lubricant. This paper analyzes lubrication type and mode, and the failure of helicopter transmission system roller bearing caused by improper lubrication. It further explains the importance of lubrication to the bearings. And how to select lubrication mode and lubricant to improve the bearing life is also summed up.

Constrained Optimization of Gas Turbine Tilting Pad Bearing Designs

2005 ◽  
Vol 128 (4) ◽  
pp. 873-878 ◽  
Author(s):  
Anders Angantyr ◽  
Jan-Olov Aidanpää
Keyword(s):  
Constrained Optimization ◽  
Gas Turbine ◽  
Power Loss ◽  
Difficult Problem ◽  
Search Method ◽  
Constraint Handling ◽  
System Level ◽  
Tilting Pad ◽  
Handling Technique ◽  
Bearing Design

This paper presents the constrained optimization of the tilting pad bearing design on a gas turbine rotor system. A real coded genetic algorithm with a robust constraint handling technique is used as the optimization method. The objective is to develop a formulation of the optimization problem for the late bearing design of a complex rotor-bearing system. Furthermore, the usefulness of the search method is evaluated on a difficult problem. The effects considered are power loss and limiting temperatures in the bearings as well as the dynamics at the system level, i.e., stability and unbalance responses. The design variables are the bearing widths and radial clearances. A nominal design is the basis for comparison of the optimal solution found. An initial numerical experiment shows that finding a solution that fulfills all the constraints for the system design is likely impossible. Still, the optimization shows the possibility of finding a solution resulting in a reduced power loss while not violating any of the constraints more than the nominal design. Furthermore, the result also shows that the used search method and constraint handling technique works on this difficult problem.

scholarly journals Metallurgical Development for Added Reliability of Industrial Gas Turbine Rotating Blades

1968 ◽  
Author(s):  
F. J. Wall
Keyword(s):  
Gas Turbine ◽  
Stress Rupture ◽  
Rotating Blades ◽  
Time Stress ◽  
Corrosion Evaluation ◽  
Long Time ◽  
Industrial Gas Turbine ◽  
Microstructural Studies ◽  
Selection Of

Increased reliability of industrial gas turbine rotating blades in the hot section of turbines has been achieved by utilization of advanced metallurgical techniques. These techniques include vacuum melting master alloy heats, minimizing residual stresses in blades after machining, and increasing the quality of nondestructive inspection of blades during and after fabrication. In addition, long time stress-rupture tests, corrosion evaluation, and microstructural studies on advanced alloys have provided necessary information for selection of turbine blade alloys for future generations of turbines.

Optimum Selection of the Vibration Monitoring System for Turbomachines

1992 ◽  
Author(s):  
Pavel Rihak ◽  
Reinhold Schmidt
Keyword(s):  
Gas Turbine ◽  
Monitoring System ◽  
Vibration Monitoring ◽  
Vibration Measurement ◽  
Simple Method ◽  
Measurement Systems ◽  
Vibration Behavior ◽  
Optimum Selection ◽  
Industrial Gas Turbine ◽  
Selection Of

Different vibration measurement systems are widely used in turbomachines to monitor their vibration behavior. There is, however, little information available for judging, which of the different options (monitoring of casing vibration velocities, relative or absolute shaft displacements) should be selected for a specific machine. The present paper describes a simple method allowing to make this selection. A formula is provided for prediction of the expected ratio of bearing casing vibrations to relative shaft vibrations caused by unbalance. By comparing this ratio to the values prescribed by the specified vibration limits, one can decide which of both systems is more suitable for monitoring purposes. Based on an example of an industrial gas turbine, it will be shown that the procedure results in a selection of the correct vibration monitoring system.

scholarly journals A Methodology for the Design of Automated Gas Turbine Diagnostic Systems

1993 ◽  
Author(s):  
E. Loukis ◽  
K. Mathioudakis ◽  
K. Papailiou
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Measurement Data ◽  
Diagnostic System ◽  
Basic Knowledge ◽  
Background Information ◽  
Diagnostic Systems ◽  
Diagnostic Potential ◽  
Industrial Gas Turbine ◽  
Selection Of

A methodology for the design of automated diagnostic systems for Gas Turbines is presented. The first stage of the proposed methodology consists in an initial selection of instruments and measuring positions on the engine, based on a basic knowledge of the engine itself and previous experience, as well as modelling capabilities of the phenomena happening in it. It is followed by a stage of “learning” experiments. One purpose of these experiments is to provide measurement data, on which a final selection of instruments will be based. The instruments most suitable for the fault cases of interest are selected, according to the diagnostic potential they offer. Another purpose is to develop procedures of automated fault diagnosis. The necessary background information for the later exploitation of the system is also established. The applicability of the entire methodology is demonstrated for the case of designing a blade fault diagnostic system for an Industrial Gas Turbine.

scholarly journals The research of dynamic impacts on the hydraulic structure foundation base, transformed in the process of accident recovery

2018 ◽  
Vol 251 ◽  
pp. 04040
Author(s):  
Zaven Ter-Martirosyan ◽  
Ivan Luzin
Keyword(s):  
Field Experiments ◽  
Dynamic Properties ◽  
Soil Parameters ◽  
Experimental Site ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Foundation Base ◽  
Dynamic Impacts ◽  
Scale Experiment ◽  
Selection Of

The article presents the results of a comprehensive research of the dynamic impacts on a modified base. The modified base was obtained as a result of compensatory injection at the experimental site for the accident recovery at the hydraulic engineering structure. The complex study of the dynamic impacts includes special laboratory tests to determine the soil parameters, the finite element analysis of the experimental site, taking into account the dynamic properties, the selection of the necessary equipment for field experiments based on the numerical solution results, a full-scale experiment with the measurement of the foundation sediments of the experimental site.

Development of L1-norm sliding mode observer for sensor fault diagnosis of an industrial gas turbine

2021 ◽  
pp. 095965182199617
Author(s):  
Mahyar Akbari ◽  
Abdol Majid Khoshnood ◽  
Saied Irani
Keyword(s):  
Fault Detection ◽  
State Space ◽  
Gas Turbine ◽  
Sliding Mode ◽  
State Space Model ◽  
Sensor Fault ◽  
Space Model ◽  
Decision Logic ◽  
Sensor Fault Detection ◽  
Industrial Gas Turbine

In this article, a novel approach for model-based sensor fault detection and estimation of gas turbine is presented. The proposed method includes driving a state-space model of gas turbine, designing a novel L1-norm Lyapunov-based observer, and a decision logic which is based on bank of observers. The novel observer is designed using multiple Lyapunov functions based on L1-norm, reducing the estimation noise while increasing the accuracy. The L1-norm observer is similar to sliding mode observer in switching time. The proposed observer also acts as a low-pass filter, subsequently reducing estimation chattering. Since a bank of observers is required in model-based sensor fault detection, a bank of L1-norm observers is designed in this article. Corresponding to the use of the bank of observers, a two-step fault detection decision logic is developed. Furthermore, the proposed state-space model is a hybrid data-driven model which is divided into two models for steady-state and transient conditions, according to the nature of the gas turbine. The model is developed by applying a subspace algorithm to the real field data of SGT-600 (an industrial gas turbine). The proposed model was validated by applying to two other similar gas turbines with different ambient and operational conditions. The results of the proposed approach implementation demonstrate precise gas turbine sensor fault detection and estimation.

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