scholarly journals Analysis of measurement points sensitivity of vibration signals on the stand of jet engine

2017 ◽  
Vol 171 (4) ◽  
pp. 279-282
Author(s):  
Grzegorz SZYMAŃSKI ◽  
Wojciech MISZTAL
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Diagnostic Methods ◽  
Essential Information ◽  
Vibration Signals ◽  
Jet Engine ◽  
Vibroacoustic Diagnostics ◽  
Selection Of ◽  
Working Processes

The diagnostic testing of internal combustion engine can be made by using working processes and methods which take advantage of leftover processes. Working processes give information about general condition of internal combustion engine. Leftover processes give information about condition of particular subassemblies and kinematic couples; hence they are used as autonomous processes or as processes supporting other diagnostic methods. Methods based on analysis of vibrations and noise changes to determine technical condition of object are named as vibroacoustic diagnostics. In papers about vibroacoustic diagnostics of engine, problems connected with difficulty to select test point and to define diagnostic parameters containing essential information about engine’s condition, are most often omitted. Selection of engine’s working parameters and conditions of taking measurements or recording vibration signal are usually based on references, researcher’s experience or intuition. General assumptions about taking measurements of signal closest to its source are most often used. This paper presents a new approach to vibroacoustic diagnostics of jet engine. Selection of measurement points of vibration signals on the basis of tests stand results was suggested and perform a sensitivity analysis of measurement points on the engine support.

scholarly journals Experimental method for the selection of points of measurement diagnostic vibration signals on internal combustion engine

2012 ◽  
Vol 150 (3) ◽  
pp. 72-79
Author(s):  
Grzegorz SZYMAŃSKI ◽  
Franciszek TOMASZEWSKI
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Diagnostic Testing ◽  
Internal Combustion ◽  
Test Point ◽  
Diagnostic Methods ◽  
Essential Information ◽  
Vibroacoustic Diagnostics ◽  
Selection Of ◽  
Working Processes

The diagnostic testing of internal combustion engine can be made by using working processes and methods which take advantage of leftover processes. Working processes give information about general condition of internal combustion engine. Leftover processes give information about condition of particular subassemblies and kinematic couples; hence they are used as autonomous processes or as processes supporting other diagnostic methods. Methods based on analysis of vibrations and noise changes to determine technical condition of object are named as vibroacoustic diagnostics. In papers about vibroacoustic diagnostics of engine, problems connected with difficulty to select test point and to define diagnostic parameters containing essential information about engine’s condition, are most often omitted. Selection of engine’s working parameters and conditions of taking measurements or recording vibration signal are usually based on references, researcher’s experience or intuition. General assumptions about taking measurements of signal closest to its source are most often used. This paper presents a new approach to vibroacoustic diagnostics of internal combustion engine. Selection of test points of vibration on the basis of impact tests results was suggested and performed a sensitivity analysis of measurement points on the cylinder head, the force impulse.

Study of Energy-Saving Potential of Electronically Controlled Turbocharger for Internal Combustion Engine Exhaust Gas Energy Recovery

2016 ◽  
Vol 138 (11) ◽  
Author(s):  
Qijun Tang ◽  
Jianqin Fu ◽  
Jingping Liu ◽  
Feng Zhou ◽  
Xiongbo Duan
Keyword(s):  
Numerical Simulation ◽  
Internal Combustion Engine ◽  
Energy Recovery ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Utilization Efficiency ◽  
Exhaust Gas ◽  
Engine Exhaust ◽  
Valve Opening ◽  
Working Processes

To promote the energy utilization efficiency of internal combustion engine, the approach of electronically controlled turbocharger (ECT) for IC engine exhaust gas energy recovery was investigated by the method of test coupling with numerical simulation. First, the tests for turbocharged gasoline engine and high-speed motor were conducted so as to provide experimental data for numerical simulation. Then, the simulation model of ECT engine was built and calibrated, and the working processes of ECT engine were simulated. The results show that the recovered exhaust gas energy by ECT increases with the decrease of by-pass valve opening due to the rising of exhaust gas mass flow rate, but the pumping loss also ascends; limited by the original engine turbocharger map, the engine working points are beyond turbine map when the by-pass valve opening increases to a certain degree. To further improve the energy recovery potential of ECT, a larger turbine was rematched, and the working processes of ECT engine under the whole operating conditions were resimulated. The results indicate that engine exhaust gas energy cannot be recovered by ECT in low-load and low-speed area due to the low exhaust gas pressure. In the effective working area, as the load and speed ascend, both the recovery efficiency of ECT and the utilization efficiency of exhaust gas energy increase, and their maximum values reach 8.4% and 18.4%, respectively. All those demonstrate that ECT can effectively recover engine exhaust gas energy.

scholarly journals PULSE JET INTERNAL COMBUSTION ENGINE

2019 ◽  
Author(s):  
Tim Walshaw
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Circular Motion ◽  
Liquid Fuels ◽  
Light Weight ◽  
Piston Engine ◽  
Jet Engine ◽  
Highly Efficient ◽  
Pulse Jet

This article describes using the pulse jet to create circular motion. Such an engine would be highly efficient, simple and cheap to build, light weight, and could use a wide variety of liquid fuels. Such a pulse jet engine would be a very efficient substitute for the piston engine.

scholarly journals To the Edge of Space — with Solar Energy

2019 ◽  
Vol 03 (01) ◽  
pp. 92-99
Author(s):  
Roland Loos ◽  
Raphaël Domjan
Keyword(s):  
Renewable Energy ◽  
Solar Energy ◽  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Jet Engine ◽  
Solar Powered

SolarStratos is developing a solar powered airplane to fly in the 2020/2021 timeframe to the stratosphere. The goal is to demonstrate that renewable energy, namely solar energy allows flight at altitudes where no internal combustion engine or jet engine can operate, providing for sustainable flight.

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