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IHS ESDU Blog

IHS ESDU provides validated information, insight and tools for engineering design. ESDU analytical methods and tools and rigorously evaluated data collections are used to assist and improve fundamental design and analysis in safety-critical industries such as Aerospace & Defense, Oil & Gas, Chemicals and Nuclear, and in Academia and Research. ESDU provides guidance on more than 1500 specific topics in a variety of aerospace, mechanical, structural and process engineering areas such as aerodynamics, aircraft noise, aerospace structures, composites, fatigue, stress and strength, vibration, heat transfer and fluid mechanics. Click here to watch a video and learn more.

Knowledge is Power! A Case Study

Posted September 28, 2015 2:30 PM by SavvyExacta
Pathfinder Tags: ESDU

Growing up, young people often hear the phrase "knowledge is power." This phrase originally appeared in Latin as "scientia potentia est" and is attributed to Sir Francis Bacon way back in 1597.

Having access to the right information can save you time, which in most businesses, translates to saving money as well. ESDU offers design methodologies that have been validated by technical committees. Using these methods can add up to a large resource savings.

Such is the case with a major aircraft manufacturer. When the FAA issued a directive to redesign fittings, the use of ESDU methods saved time and effort worth more than a million dollars. Engineers were able to use existing data and methodologies in their designs and calculations.

You can read the full story in this case study. For more information on ESDU, visit www.ESDU.com.

8 comments; last comment on 10/03/2015
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Using Software to Aid Aircraft Design Analysis

Posted April 17, 2015 12:00 AM by SavvyExacta

Data is only as good as how it's used. And while there is a lot of data available about metal and composite structures, good software can help apply what these numbers will mean in real-word applications.

Software can provide efficient, reliable, and traceable work-flows. It reduces lead time, resource requirements, and costs related to engineers who are independently recreating the same work time and time again.

STRENGTH2000® is an internal tool created by Airbus Defence & Space that is now available for commercial use. This software that integrates ESDU data and design methodologies with other verified strength and stability handbook methods.

Possible applications include:

  • Eurofighter sizing, check stress, enhancements as well as build line & in-service support
  • Tornado life cycle extension
  • A400M cargo door development and qualification
  • A380, A340, & A320 Flap Track development
  • UAV development

Attend a free webinar to learn more:

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How to Predict In-flight Coaxial Jet Noise

Posted April 03, 2015 12:00 AM by SavvyExacta
Pathfinder Tags: aerospace ESDU

Did you know that there are regulations regarding aircraft noise? Software is a valuable tool for predicting what aircraft might sound like in certain scenarios.

ESDU software estimates the change in coaxial jet noise spectrum levels when moving from stationary to flight conditions. The method breaks up the coaxial jet mixing noise into three discrete single-stream jets:

  1. The secondary jet
  2. The mixed jet
  3. The interaction jet

Each of these discrete jets is characterized by different combinations of the coaxial jet parameters.

Considering velocity alone, the single-stream jet that represents the mixed jet has a velocity that is a function of the velocity ratio, the temperature ratio and the area ratio of the coaxial jet.

The velocity of the interaction jet is taken to be the same as that of the primary (core) flow of the coaxial jet, and the velocity of the secondary jet taken to be that of the secondary (fan) flow of the coaxial jet.

The other parameters of jet temperature, jet flow area and jet diameter are treated in similar but individual ways.

The noise from each source is predicted, modified, and summed to provide a static coaxial jet noise spectrum.

Read more about this topic in an IHS Engineering360 interview with Cyrus Chinoy, head of EDSU's Aircraft Noise & Structural Dynamics Group, and Willie Bryce, a member of the organization's Aircraft Noise Committee.

1 comments; last comment on 04/05/2015
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ESDU Challenge: Acenaphthene

Posted March 13, 2015 12:00 AM by SavvyExacta
Pathfinder Tags: ESDU esdu challenge

In this series from IHS ESDU, challenge questions will be posted for the community. Some questions may require calculations and others are general knowledge questions.

Here's this week's question:

The use of oil flow visualisation as a means of identifying flow features can be a valuable tool to aid the analysis of the aerodynamic characteristics of a configuration. In this process, acenaphthene is used to:

a) show boundary layer transition in low-speed tests by evaporation

b) show boundary layer transition in high-speed tests by sublimation

c) show flow direction near the model surface by streaking


Check back soon for the solution to this question! Visit the IHS ESDU website for more information about the validated design methods, or to request a trial subscription.

7 comments; last comment on 03/13/2015
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100th Site Release Provides New Toolbox Apps (Free)

Posted March 02, 2015 12:00 AM by SavvyExacta
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IHS ESDU provides validated design methods for aerospace engineers. One perk of an ESDU subscription is that these methods are constantly being updated. The February 2015 version of ESDU is the 100th such release. (Of course, this doesn't include the many versions that were made available when ESDU content was available as a hard copy!)

New this month are the Toolbox Apps:

The apps are available to use free of charge, without any additional registration. Give them a try and let us know what you think!

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