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EasT coasT EdiTion Sicma Aero Seat: Morphing of the Cushion
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MorpHing of THE cusHion
Sicma aero Seat is the european Seat division of Zodiac group, specializes in the manufacture and sale of passenger seats for civil aircraft, crew seats and cabin systems and equipment. Seat size, ergonomic design, and value-added features are becoming essential to airline marketing strategy. In 2007, Sicma Aero Seat chose HYPERWORKS for seat design under dynamic loadings. This decision was guided by:

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• The offer which gives access to many attractive tools, • Their quality, • The user friendliness of the tools especially of HyperMesh, HyperCrash and Radioss. • The cost benefit of the license system.
Three engineers are using altair products with the HII 50%tile dummy, adapted for the aeronautics. Within the context of the SAE Technical Committee “Sae aircraft Seat” working on the recommendations for seat design, ARP 5765, Sicma aero Seat made a study of the interest of the morphing technique available in HyperCrash for the 16g sled test. This technique consists of the upper surface deformation of the cushion to fit the dummy shape which has been set at the H position (morphing phase). Then the inner mesh

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Compliance with the requirements of FaR25.562 is a critical driving factor for seat design. as a part of the ongoing work on Certification by analysis, SICMA Aero seat has made significant investigations on various analysis techniques for computer based dynamic testing using Hyperworks. The new generations of competitive, dynamiccompliant seats provide innovative, effective, and customized solutions. Seats Division customers include all of the world’s premier airlines, along with a strong presence in the airbus and Boeing programs. Sicma aero Seat offers broad, individualized lineups, designed in close cooperation with the marketing and technical divisions of airlines and air framers.

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of the cushion is smoothed to respect regular conditions. These two phases are done in the pre processor HyperCrash which handles the safety tools in crash models. Simulating the dummy positioning is another solution. It is a quasi static loading problem also:

• The implicit solution can be applied moving the dummy at the right position within displacement steps (convergence criteria), • The dynamic relaxation method can be used (based on material damping) based on the explicit scheme. • The kinematic relaxation based on an imposed kinetic energy dissipation (Radioss unique approach).
The sled test model is made up of:

• Seat pan and backrest on aluminum parts • Seat pan & backrest cushions • Nylon Seat belt 2pts with 50N pretensioner • Aero Hybrid II 50%tile dummy • BCS on the seat pan & backrest interfaces with the base frame
The following material laws are used:

• The aluminum parts are modeled using the material law 36 “tabulated elasto-plastic”. • The cushion foam behavior is obtained with the material law 70 (foam material law). • The fabric material law (58) is used for the seat belts
Two processes are applied:

•	 Loadcase 1 (KEREL): establishing equilibrium position with the Kinetic Relaxation method (duration 100ms) before the dynamic 16g pulse •	 Loadcase 2 (MORPH): Dummy positioning with Morphing based on the Hpoint position followed by the dynamic16g pulse
Head path & Head acceleration comparisons show the perfect equivalence of both methods. The stress and strain states in the cushion are negligible. The important points are:

Sled Test Model

• To have the dummy at the right level, regarding the H-point positioning, • To have the right contact surface between the dummy and the cushion avoiding initial penetrations.
Head Path & Head Acceleration Comparisons

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as the behavior is equivalent on 16g, the following process is proposed by Sicma aero Seat:

• Dummy positioning at the H point position of the 16g sled test • Morphing of the cushion • 16g dynamic loading of the model
The benefits are:

• The influence of the strain and stress states in the cushion is negligible. • The use of morphing instead of running the dummy positioning with the dynamic relaxation saves the CPU time of this run, which is between 7 to 10 hours.
This CPU time reduction allows to run more variants and to consider an optimization phase in the seat design loop. We would like to thank Jeremy Cailleteau, FEA team leader at Zodiac for authoring this article.

Seat Belt Loads

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alTair in THE nEWs
March 27, 2009

solidThinking, inc. connecting with the design community at idsa conferences March 27-May 3 nationwide

Thyssenkrupp Tallent ltd. adopts altair’s HyperWorks Enterprise simulation solution for automotive
altair professional Workforce initiative program for displaced Michigan Engineers altair engineering will offer free technology training courses and licenses for advanced software to displaced engineers in Michigan who want to expand their skills in computer-aided engineering (Cae) as a way of increasing their marketability to employers. For more details, click here. We have recently added 4 new software updates. Visit our website for full release notes and the ability to download them. 9.0 – sa1-009 Hypercrash release date 2/09/2009 This update provides many new features and enhancements in HyperCrash 9.0. The major ones include the new Model Browser which allows users to review the model structure and create or modify includes and RADIOSS submodels, adding the HPUX 11.11 platform support, and supporting the latest RADIOSS 9.0Sa1 keywords.

chassis design March 12, 2009 solidThinking adds Javelin Technologies to growing roster of Value-added resellers March 10, 2009 four seasons resort aviara installs ilumisys lEd light Tubes February 18, 2009

leading provider of Engineered sealing and structural solutions for the automotive industry expands use of HyperWorks February 5, 2009 altair’s new personal pBs Turns personal computers into powerful compute clusters for free February 2, 2009

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spEcial announcEMEnTs
9.0 – sa1-030 HyperView interfaces release date 2/09/2009 This update provides enhancement and corrections to HyperView solver interfaces including PAMCRASH2G, LSDYNA, NASTAN, and ANSYS. 9.0 – sa1-028 caTia product update release date 3/06/2009 This update supersedes and replaces HWupdate-90-SA1004-Catia. It adds support for CATIA v5r19 and earlier models with .CatPart or .CatProduct extensions. 9.0 – sa1-027 HyperMesh product update release date 3/06/2009 This update supersedes and replaces HWupdate-90-SA1-019HyperMesh and contains all fixes from that update, as well as additional fixes and enhancements for HM core, connectors, interfaces and CaD readers.

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Here are upcoming HyperWorks training courses. For more details on these courses, to obtain a full schedule or to inquire about customized onsite training, call your local Altair office or email

MicHigan Training classEs (TroY)

intro. fEa Modeling & results Visualization April 14 - 16, May 4 - 6, May 26 - 28 intro. to radioss april 14 intro. concept design & fine Tuning with optistruct April 15 -16, May 19 - 20 intro. doE, optimization & stochastic studies April 17 intro. to Hypercrash april 20 intro. to radioss impact april 21 - 22 intro. MBd Modeling & results Visualization April 27 - 29 intro to Hypershape/catia 3.1 May 21 intro. Managing & using pBs professional May 26 - 28 interfacing HyperWorks with aBaQus May 29

addiTional HYpErWorks Macros (for Hg): Finds entered text for all Plot Titles, axes, Curves, Notes in either current window or current page or all pages as selected by the user and replaces the same with a string specified by the user again (written by Jim Cardinal). Download rBE2_Tospring .zip (for HM): Splits and converts RBe2 elements into individual spring elements. Download

canada Training classEs (ToronTo, onT.)
intro. concept design & fine Tuning with optistruct april 18 - 19 HyperMesh introduction april 21 - 23 intro. fEa Modeling & results Visualization April 21 - 23; May 12 - 14 HyperWorks 10.0 rollout Training May 28

supporT Tips & Tricks

Auto Contact option under “Abaqus Contact Manager” allows one to quickly create interactions between parts. Download Creating PRETS179 element using HM-Ansys Interface. Download

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EasT coasT EVEnTs
saE World congress april 20 - 23, 2009 Detroit, MI

Bio-iT World conference April 27 - 29, 2009 Boston, MA East coast HyperWorks user group Webinar series: frEE BodY diagraM april 29, 2009 Online - Webinar agricultural Machinery conference May 4 - 6, 2009 Cedar Rapids, IA Windpower 2009 conference May 4 - 7, 2009 Chicago, IL

altair/TardEc aiM firE Military day May 14, 2009 Troy, MI dicE alliance conference May 18 - 20, 2009 Springfield, OH East coast HyperWorks user group Webinar series: Tcl/Tk May 27, 2009 Online - Webinar aHs forum 65 May 27 - 29, 2009 Grapevine, TX

upcoMing EVEnTs
coE 2009 annual plM conference & Technifair april 19 - 22 Seattle, WA cug 2009 May 4 - 7 atlanta, ga lightfair 2009 May 5 - 7 New York, NY formula saE Michigan May 13 - 16 Brooklyn, MI parallel cfd 2009 May 18 - 22 Moffett, CA

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