Terms:
SAE International Journal of Aerospace
AND
11
AND
2
Show Only

Collections

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Determination of Influence of Parameters on Undercarriage Shock Absorber

SAE International Journal of Aerospace

IIST, India-Pallavi Singh
IISc, India-Badari Kantheti
  • Journal Article
  • 01-11-02-0006
Published 2018-12-31 by SAE International in United States
The simple oleo pneumatic (shock absorber) model was developed using the available computational fluid dynamics (CFD) program to understand how various parameters influence the performance of the undercarriage shock absorber. The study is divided into two parts: first part is focused on the influence of orifice geometry and the second part of the study is focused on the other parameters including chamber geometry. Both the studies are carried out using design of experiments (DOE) for the same output characteristics (response). In this study, the impacts on the flow behavior due to the orifice shapes are also studied. The results and the other outcomes are shown in the form of DOE parameters such as main effect plots and interaction plots.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Power Quality Test Data Analysis for Aircraft Subsystem

SAE International Journal of Aerospace

UTC Aerospace Systems, India-Shobha Ramanjani
  • Journal Article
  • 01-11-02-0008
Published 2018-12-21 by SAE International in United States
Aircraft subsystem development involves various combinations of testing and qualification activities to realize a flight-worthy system. The subsystem needs to be verified for a massive number of customer requirements. Power quality (PQ) test is also an important testing activity carried out as part of the environmental qualification test. It is intended to verify the functionality of subsystems with various kinds of power disturbances and to determine the ability of a subsystem to withstand PQ disturbances. The subsystem being designed should be reliable enough to handle PQ anomalies. A PQ test results in an enormous amount of data for analysis with millions of data samples depending on the test and can be identified as big data. The engineer needs to analyze each set of test data as part of post-processing to ensure the power disturbances during testing are as per the standard requirements and that the functional performance of the subsystem is met. Manually analyzing the test data with classical methods and generating the report requires more time and effort, as millions of test data samples…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Modeling of Ducted-Fan and Motor in an Electric Aircraft and a Preliminary Integrated Design

SAE International Journal of Aerospace

Tsinghua University, China-Yuzhi Jin, Yuping Qian, Yangjun Zhang, Weilin Zhuge
  • Journal Article
  • 01-11-02-0007
Published 2018-10-04 by SAE International in United States
Electric ducted-fans with high power density are widely used in hybrid aircraft, electric aircraft, and VTOL vehicles. For the state-of-the-art electric ducted-fan, motor cooling restricts the power density increase. A motor design model based on the fan hub-to-tip ratio proposed in this article reveals that the thermal coupling effect between fan aerodynamic design and motor cooling design has great potential to increase the power density of the motor in an electric propulsion system. A smaller hub-to-tip ratio is preferred as long as the power balance and cooling balance are satisfied. Parametric study on a current 6 kW electric ducted-fan system shows that the highest motor power density could be increased by 246% based on the current technology. Finally, a preliminary design was obtained and experiments were conducted to prove the feasibility of the model.
This content contains downloadable datasets
Annotation ability available
Open Access

Dynamic Particle Generation/Shedding in Lubricating Greases Used in Aerospace Applications

SAE International Journal of Aerospace

Nye Lubricants, Inc.-Jason T. Galary
  • Journal Article
  • 01-11-02-0005
Published 2018-08-03 by SAE International in United States
The purpose of this study is to examine the phenomenon of Dynamic Particle Generation in lubricating greases that are used in a variety of critical Aerospace mechanisms. Particle Generation occurs in bearings, ball screws, and other mechanical devices where dynamic conditions are present. This should not be confused with outgassing as particle generation is unrelated to the pressure effects on a system. This is a critical factor in many systems as particle generation can contaminate systems or processes causing them to fail. These failures can lead to excessive costs, production failure, and equipment damage. In this study, several greases made from Multiplyalkylated Cyclopentane and Perfluoropolyether base fluids were tested to evaluate their particle generation properties. This particle generation phenomenon was studied using a custom test rig utilizing a high precision cleanroom ball-screw to simulate true application conditions. The ball-screw was tested at speeds from 200, 1,200, and 2,400 RPM to illustrate the effect of speed on the particle generation across different applications. This article will show the tendencies of different lubricant chemistries to generate particles…