Engine systems

2021 ◽  
pp. 80-220
Author(s):  
Tom Denton ◽  
Hayley Pells
Keyword(s):  
Engine Systems

scholarly journals Novel Multilayer SAW Temperature Sensor for Ultra-High Temperature Environments

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 643
Author(s):  
Xuhang Zhou ◽  
Qiulin Tan ◽  
Xiaorui Liang ◽  
Baimao Lin ◽  
Tao Guo ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Sensor ◽  
X Ray Diffraction ◽  
Aero Engine ◽  
Before And After ◽  
Application Potential ◽  
Passive Sensors ◽  
Temperature Exposure ◽  
Engine Systems

Performing high-temperature measurements on the rotating parts of aero-engine systems requires wireless passive sensors. Surface acoustic wave (SAW) sensors can measure high temperatures wirelessly, making them ideal for extreme situations where wired sensors are not applicable. This study reports a new SAW temperature sensor based on a langasite (LGS) substrate that can perform measurements in environments with temperatures as high as 1300 °C. The Pt electrode and LGS substrate were protected by an AlN passivation layer deposited via a pulsed laser, thereby improving the crystallization quality of the Pt film, with the function and stability of the SAW device guaranteed at 1100 °C. The linear relationship between the resonant frequency and temperature is verified by various high-temperature radio-frequency (RF) tests. Changes in sample microstructure before and after high-temperature exposure are analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The analysis confirms that the proposed AlN/Pt/Cr thin-film electrode has great application potential in high-temperature SAW sensors.

Energetic, exergetic, exergoeconomic, environmental (4E) and sustainability performances of an unmanned aerial vehicle micro turbojet engine

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ozgur Balli ◽  
Alper Dalkıran ◽  
Tahir Hikmet Karakoç
Keyword(s):  
Environmental Sustainability ◽  
Engine Performance ◽  
Maximum Energy ◽  
Content Type ◽  
Cost Rate ◽  
Turbojet Engine ◽  
Energy And Exergy ◽  
Aerial Vehicle ◽  
Exergoeconomic Analysis ◽  
Engine Systems

Purpose This study aims to investigate the aviation, energetic, exergetic, environmental, sustainability and exergoeconomic performances of a micro turbojet engine used in unmanned aerial vehicles at four different modes. Design/methodology/approach The engine data were collected from engine test cell. The engine performance calculations were performed for four different operation modes. Findings According to the results, maximum energy and exergy efficiency were acquired as 19.19% and 18.079% at Mode 4. Total cost rate was calculated as 6.757 $/h at Mode-1, which varied to 10.131 $/h at Mode-4. Exergy cost of engine power was observed as 0.249 $/MJ at Mode-1, which decreased to 0.088 $/MJ at Mode-4 after a careful exergoeconomic analysis. Originality/value The novelty of this work is the capability to serve as a guide for similar systems with a detailed approach in the thermodynamic, thermoeconomic and environmental assessments by prioritizing efficiency, fuel consumption and cost formation. This investigation intends to establish a design of the opportunities and benefits that the thermodynamic approach provides to turbojet engine systems.

Cooling effectiveness of thermoacoustic heat engine systems development

2018 ◽  
Author(s):  
A. R. Irfan ◽  
M. Z. M. Zarhamdy ◽  
S. M. Sazli Saad ◽  
H. M. Hafiz ◽  
A. Azlida
Keyword(s):  
Heat Engine ◽  
Systems Development ◽  
Cooling Effectiveness ◽  
Engine Systems

Application of neural networks in forecasting engine systems reliability

2003 ◽  
Vol 2 (4) ◽  
pp. 255-268 ◽  
Author(s):  
K. Xu ◽  
M. Xie ◽  
L.C. Tang ◽  
S.L. Ho
Keyword(s):  
Neural Networks ◽  
Engine Systems

scholarly journals Inexpensive Intelligence Using Procedural Propositional Logic

2009 ◽  
Vol 13 (2) ◽  
Author(s):  
Richard C. Hicks ◽  
Keith Wright
Keyword(s):  
Propositional Logic ◽  
Inference Engine ◽  
External Costs ◽  
High Return ◽  
Order Of Magnitude ◽  
Inference Systems ◽  
The Cost ◽  
Engine Systems ◽  
Logic Rule ◽  
Very High

Implementations of inference engine systems invoke many costs, including the cost of the inference engine itself, the cost of integrating the inference engine, and the cost of specialized personnel needed to create and maintain the system. These costs make a very high return on investment a criterion for incorporating these systems into the corporate portfolio of applications and technologies. Recently, the No Inference Engine Theory (NIET) [8] has been developed for creating procedural propositional logic rule-based systems. The NIET systems are implemented in traditional procedural languages such as C++ and do not need an inference engine or proprietary languages, thus eliminating the cost of the inference engine, the cost of integrating the system, and the cost for knowledge of a proprietary language. In addition, these procedural systems are an order of magnitude faster [8] than inference systems and maintain linear performance. For problems using propositional logic, the procedural systems described in this paper offer dramatically lower costs, higher performance, and ease of integration. Lowering the external costs and eliminating the need for specialized skills should make NIET systems more profitable and lead to the wider use of propositional logic systems in business.

Fuzzy assessment of FMEA for engine systems

2002 ◽  
Vol 75 (1) ◽  
pp. 17-29 ◽  
Author(s):  
K Xu ◽  
L.C Tang ◽  
M Xie ◽  
S.L Ho ◽  
M.L Zhu
Keyword(s):  
Fuzzy Assessment ◽  
Engine Systems
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