IHS ESDU Blog Blog

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.

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The Need for Validated Design Methods to Complement Computer Simulation

Posted February 18, 2013 12:00 AM by r2hou

In today's design engineering and product development workflows, the use of computer simulation for design and analysis is quite widespread. With faster processors, better visualization and improved I/O performance, engineers are able to use computers to better effect in solving complex problems quickly and easily. For example, one can analyze the structural performance of the landing gear of an aircraft using FEA or model air flow over an airplane wing during takeoff using CFD. One can also create products entirely on the computer from initial modeling to analysis and manufacturing.

Though these are welcome developments for the engineering community at large, the need for validated design methods against which engineers can confirm the accuracy of their computational models and analyses has never been greater. Industry standards such as the ASME BPVC are one resource for such detailed guidelines and methods. Reference texts like Roark's Formulas for Stress and Strain are well-accepted in industry and are very useful. Companies also have their own internal design practices and methods in many cases, but these are proprietary and not accessible to the larger engineering community. There is a wide set of design problems or areas for which proven and accepted methods are not readily available.

IHS ESDU addresses this gap by making information verified by experts in industry and academia accessible to companies and individuals in different industries. The types of resources that ESDU provides include design methods, best practice guides, material and test data and software tools. For instance, ESDU contains more than 300 analytical and empirical tools to solve a wide range of aerodynamics problems. A specific example is a design tool for estimating excrescence or parasitic drag which can be used to determine the drag related impact of an attachment such as an antenna or a maintenance patch. Similarly, there are 1500 or so other design topics where ESDU methods and information provide invaluable insight. Here is some additional information on how ESDU helps engineers.

We would like to use this blog to discuss such design/engineering contexts and how engineers solve problems and make decisions.

What do you think? Do you have an easy time finding the validated design/engineering information you need?

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Re: The Need for Validated Design Methods to Complement Computer Simulation

02/24/2013 9:36 AM

Back in the sixties when the computer was first used for the design of structures, I had the job of verifying the trial runs, at three different companies. I remember the first one very well, The vendor brought it to my boss who gave it to me and they sat down for a chat. My first check was to see that ∑F=0 and ∑M=0 was true for the exterior forces; I found that it wasn't before they finished their chat. Moving on, our pre-computer methods used only primary load paths unless we saw a reason to go deeper, something to be avoided if possible since the work grew exponentially rather than simply being the addition of one to the other, but the computer output considered all load paths, or should have.

We could look at a primary load path as though it carried all of the load, and we could look at the secondary path as though it carried all of the load, but the difficulty came in determining how much was carried by each.

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