Expert SHM and CM of Turbojet Engine FCU Using Instantaneous Angular Speed Signal

2019 ◽  
pp. 320-329
Author(s):  
Mirosław Witoś ◽  
Mariusz Zieja ◽  
Mariusz Żokowski ◽  
Jarosław Kozdra ◽  
Daniel Pawłowski
Keyword(s):  
Angular Speed ◽  
Turbojet Engine ◽  
Instantaneous Angular Speed

Design of a wire measurement system for dynamic feeding TIG welding using instantaneous angular speed

2018 ◽  
Vol 101 (5-8) ◽  
pp. 1651-1660 ◽  
Author(s):  
Régis Henrique Gonçalves e Silva ◽  
Luiz Eduardo dos Santos Paes ◽  
Gustavo Luis de Sousa ◽  
Cleber Marques ◽  
Alberto Bonamigo Viviani ◽  
...  
Keyword(s):  
Measurement System ◽  
Angular Speed ◽  
Tig Welding ◽  
Instantaneous Angular Speed

Fully-Coupled Turbojet Engine CFD Simulations and Cycle Analyses Along the Equilibrium Running Line

2020 ◽  
Author(s):  
Alejandro Briones ◽  
Andrew W Caswell ◽  
Brent Rankin
Keyword(s):  
Flow Rate ◽  
Fluid Dynamic ◽  
Thermodynamic Cycle ◽  
Angular Speed ◽  
Small Scale ◽  
Cfd Simulations ◽  
Fuel Flow ◽  
Turbojet Engine ◽  
Design Cycle ◽  
Fully Coupled

Abstract This work presents fully-coupled computational fluid dynamic (CFD) simulations and thermodynamic cycle analyses of a small-scale turbojet engine at several conditions along the equilibrium running line. The CFD simulations use a single mesh for the entire engine, from the intake to the exhaust, allowing information to travel in all directions. The CFD simulations are performed along the equilibrium running line by using the iterative Secant method to compute the fuel flow rate required to match the compressor and turbine power. The freestream pressure and temperature and shaft angular speed are the only inputs needed for the CFD simulations. To evaluate the consistency of the CFD results with thermodynamic cycle results, outputs from the CFD simulations are prescribed as inputs to the cycle model. This approach enables on-design and off-design cycle calculations to be performed without requiring turbomachinery performance maps. In contrast, traditional off-design cycle analyses require either scaling, calculating, or measuring compressor and turbine maps with boundary condition assumptions. In addition, the CFD simulations and the cycle analyses are compared with measurements of the turbojet engine. The CFD simulations, thermodynamic cycle analyses, and measurements agree in terms of total temperature and pressure at the diffuser-combustor interface, air and fuel mass flow rate, equivalence ratio, and thrust. The developed methods to perform CFD simulations from the intake to the exhaust of the turbojet engine are expected to be useful for guiding the design and development of future small-scale gas turbine engines.

Influence of the Instantaneous Angular Speed (IAS) of Marine Diesel Engine on its Indication Results

2015 ◽  
Vol 236 ◽  
pp. 204-211
Author(s):  
Marek Łutowicz ◽  
Dominika Cuper-Przybylska
Keyword(s):  
Time Domain ◽  
Ad Hoc ◽  
Angular Speed ◽  
Time Axis ◽  
Crank Angle ◽  
Instantaneous Angular Speed ◽  
Marine Diesel ◽  
Angle Rotation ◽  
Crankshaft Rotation ◽  
Opening And Closing

The paper presents a method of transforming the time axis to the axis of the crank angle rotation based on the pressure measured in time domain and simplified model of the engine dynamics. Indicating is to register the pressure in synchronism with the engine crank angle rotation. Usually in the ad hoc measurements the crankshaft rotation angle transducer is avoided, and the measurements are performed in time domain. For further analysis time axis is transformed for crank angle axis on the base of linear transform. Pressure waveforms obtained during the research were subject of the described transform. During the research instantaneous angular speed (IAS) of the engine crankshaft has been changed by reducing fuel dosage to selected cylinders. Mean indicated pressure (MIP) was calculated. Values o pressure on the begging and the end of compression, opening and closing angles of valves were also determined.

An investigation of the effects of measurement noise in the use of instantaneous angular speed for machine diagnosis

2006 ◽  
Vol 20 (6) ◽  
pp. 1444-1460 ◽  
Author(s):  
Fengshou Gu ◽  
Isa Yesilyurt ◽  
Yuhua Li ◽  
Georgina Harris ◽  
Andrew Ball
Keyword(s):  
Angular Speed ◽  
Measurement Noise ◽  
Instantaneous Angular Speed

scholarly journals Processing of Instantaneous Angular Speed Signal for Detection of a Diesel Engine Failure

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Adam Charchalis ◽  
Mirosław Dereszewski
Keyword(s):  
Diesel Engine ◽  
Measurement Data ◽  
Engine Performance ◽  
Failure Detection ◽  
Angular Speed ◽  
Measured Signal ◽  
Main Task ◽  
Optical Encoder ◽  
Detection Analysis ◽  
Instantaneous Angular Speed

Continuous monitoring of diesel engine performance under its operating is critical for the prediction of malfunction development and subsequently functional failure detection. Analysis of instantaneous angular speed (IAS) of the crankshaft is considered as one of the nonintrusive and effective methods of the detection of combustion quality deterioration. In this paper results of experimental verification of fuel system's malfunction detecting, using optical encoder for IAS recording are presented. The implemented method relies on the comparison of measurement results, recorded under healthy and faulty conditions of the engine. Elaborated dynamic model of angular speed variations enables us to build templates of engine behavior. Recorded during experiment, values of cylinder pressure were taken for the approximation of pressure basic waveform. The main task of data processing is smoothing the raw angular speed signal. The noise is due to sensor mount vibrations, signal emitter machining, engine body vibrations, and crankshaft torsional vibrations. Smoothing of the measurement data was carried out by the implementation of the Savitzky-Golay filter. Measured signal after smoothing was compared with the model of IAS run.

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