Reliability of wear-out items in electric motors in space — A case study

Author(s):  
Jacob C. Burke ◽  
John W. Evans
Keyword(s):  
Author(s):  
Dhruv Kumar ◽  
Michael Moeller

Drivetrains for turbomachinery used in plant operations generally consist of a centrifugal compressor driven by turbines or electric motors, and may include intermediate speed reducing gearboxes. Each of these drivetrain components require accurate torsional modelling to ensure safe operation. Shaft modelling assumptions for these component sections can significantly alter the location of predicted torsional criticals and responses. One essential modelling assumption is the calculation of effective torsional stiffness in stepped shafts. Industry accepted methods include shaft penetration, the 45 degree rule and FEA approaches. A comparison of the three methods and the torsional impacts on a case study are presented.


Author(s):  
Lucio Ciabattoni ◽  
Gionata Cimini ◽  
Francesco Ferracuti ◽  
Massimo Grisostomi ◽  
Gianluca Ippoliti ◽  
...  

Aviation ◽  
2016 ◽  
Vol 20 (2) ◽  
pp. 85-97 ◽  
Author(s):  
Roberta FUSARO

The aim of this work is to present the design of a more environmental friendly aircraft that complies with existent and future emission regulations. Recent Market Outlooks were examined and a single engine piston prop was selected as a case study. Matching Charts were used to estimate the hybridization degree, meaning the ratio between the power provided by the electric motors and the total amount of power. This method allowed the over-boost advantage to be highlighted and pointed out secondary benefits of a hybrid Piston Prop. Furthermore, the zero-emission taxi possibility was evaluated. Both fuel savings forecast and safety analysis were performed, showing secondary advantages of a high hybridization degree for a single engine Piston Prop configuration. Furthermore, the additional weight related to electric motors and storage system is taken into account and state-of-the-art and innovative under-development technologies are considered. Thus, the conceptual design phase will produce many possible architectures; therefore, the last part of the work consists of a trade study necessary to select the optimal solution to design an innovative hybrid Piston Prop aircraft.


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