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断面に RBE2 が入っている場合の、FBD つり合い力の算出に関する研究
始めに 断面のつり合い力 (自由体力、フリーボディダイナミクス) を求める FBD の機能ですが、次の図のように、剛体 RBE2 がある部分で、つり合い力がおかしくなることがあります。下の図は荷重 1.0 の片持ちばりなので、せんだん力はどこでも 1.0 のはずですが RBE2 のある場所で 0.7 まで下がってしまっています。 実はこちらの記事で RBE2 が入っている断面があるときは MPC 力を考慮すればよい、という記事を挙げているのですが、事態はそれほど単純ではなく、MPC 力を考慮したら間違ったつり合い力となる場合や、考慮してもしなくてもどちらでも良い場合もあることが分かりました。…
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Solar panel deflection due to wind!
Outlook: * Inspire CAD to genereate model. Simlab meshing and solution set-up in easy GUI for CFD and Structural analysis. * Mapped pressure from CFD to Structure. This results can be used to evaluate the structure and improve the design of the panel. This article includes: * 1 Inspire model with the solar panel.* Altair…
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Evaluating Structural Integrity: SimSolid Simulations of Wind Loads on Architectural Building
In the design and analysis of structures like the Architectural building, understanding wind load scenarios is crucial for ensuring both performance and structural integrity. SimSolid proves to be a valuable tool in this evaluation process. Wind loads, generated by air movement around the building, have a significant…
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Minimizing Weight without Sacrificing Strength: Techniques to reduce Wristwatch case weight while maintaining structural integrity using Altair Inspire
In the world of wristwatch design, achieving the perfect balance between weight and strength is a critical challenge. A lighter watch enhances comfort and wearability, while a robust case ensures durability and protection for the delicate internal mechanisms. This article explores effective techniques to minimize the…
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This paper describes Altair's solution for ADAS through a combined workflow between Altair Feko and Altair WinProp. More specifically, the procedure to set up different ADAS scenarios, analyze and post-process using the FMCW chirp are explained in detail.
Introduction RADAR (Radio Detection and Ranging) systems find their use across various sectors including military, aircraft and maritime navigation, space exploration, security surveillance, and more. In recent years, there has been a growing interest in its application within the automotive industry to mitigate road…
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Radioss Validation Study: JOHNSON-HOLMQUIST-CONCRETE material law
The JOHNSON-HOLMQUIST-CONCRETE material law is a very interesting material law for concrete modeling, especially for defense applications. This material law has been implemented in Radioss V2024.1. This material law is available with the non-local regularization; this is particulary interesting to have mesh-independant…
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Tire Envelope Analysis using Altair Simulation.
Updated material for the 2023 interface can be found here: KB0124958
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Frequency selective surfaces (FSS) have useful properties for intelligent HF design of radomes, reflectors or radar absorbing materials. This article describes how such designs can be modelled and analysed with new specialised tools in Feko.
Frequency Selective Surfaces (FSS) Modeling Improvements in Feko Antenna, Radome and RCS Problems Frequency selective surfaces (FSS) are periodic Metasurfaces with identical two-dimensional arrays of elements arranged in a multilayer dielectric substrate. They form a 3D-filter for incident electromagnetic plane waves and…
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Radioss を使って、3D カメラ撮影で取得したグリッドと CAD のずれている場所を探す方法
始めに HyperMesh や MVD (Model Verification Director) の形状比較機能を用いると、CAD と FEM などの比較はできるのですが、点群と CAD/FEM との比較ができません。そこでいろいろと考えていたのですが、そもそも点と面の距離を測定するということは、Radioss が点と面の接触や結合の計算をするときに行っていることですから、Radioss をこの目的に使ってみようということで、私なりに実施してみた内容を、ここに記します。 例 課題 このような形状のものを例とします。茶色の点が測定によって取得した点群データ、青色が CAD の表面に形状重視で張ったシェルメッシュです。Radioss…
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Integration of non-local regularization into simulations.
This article presents a methodology for the integration of non-local regularization into simulations. This article includes: * 2 ready-to-use Altair Radioss models of Tensile test specimen. * Altair HyperMesh version is V2024. * Altair Radioss version is V2024.1. * The Unit System is in Mg, mm, s * Altair HyperWorks…
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Bird Strike on Wing Leading Edge with Radioss
This article presents a simulation using Radioss of a 90m/s bird strike on a wing leading edge. This article includes: * 2 ready-to-use Altair Radioss models of bird strike* Altair HyperMesh version is V2024. * Altair Radioss version is V2024.1. * The Unit System is in t, mm, s * Altair HyperWorks session files to allow…
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Near-field infrared spectroscopy simulations using Altair Feko By P.McArdle, D.J.Lahneman, H.Jiang, M.M.Qazilbash – Department of Physics, College of William & Mary
In this white paper, we have developed a numerical technique to accurately model the experimental near-field amplitude and phase spectra in near-field infrared nano-spectroscopy. Our numerical method using Altair Feko is especially useful for describing surface phonon-polaritons. Also, extension of our numerical technique…
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Introduction to CFD-DEM for modelling fluid-particle systems
Granular materials are everywhere! In fact, they are present in about 70% of all industrial processes. In many cases, the granular material does not exist in isolation - their behavior is significantly influenced by the liquids and gases in which they are found. These particle-fluid, or multi-phase flows, are encountered…
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Creating Virtual Shock Absorbers in Simulation Software-SIMSOLID
Creating Virtual Shock Absorbers in Simulation Software-SIMSOLID Virtual shock absorbers are essential components in simulation software for analyzing mechanical systems' dynamic behavior under varying loads and conditions. This guide provides step-by-step instructions on how to create and configure virtual shock absorbers…
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Altair Feko: サポートされているソリューションの組み合わせについて
この記事は、Do You know Spherical Wave Expansion (SWE), and would like to find out how you can use this technology in Feko? Then you should read on now. The following illustrative examples show how SWE can be defined and calculated in Feko and for what kind of problems this approach is beneficial.(KB0124401)を翻訳したものです。…
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Altair Fekoで球面波展開(SWE)を活用する方法
この記事は、Do You know Spherical Wave Expansion (SWE), and would like to find out how you can use this technology in Feko? Then you should read on now. The following illustrative examples show how SWE can be defined and calculated in Feko and for what kind of problems this approach is beneficial.(KB0124401)を翻訳したものです。 Feko…
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この技術論文では、Feko でレーダー断面積 (RCS) を効率的に計算および分析する方法と、最近追加された機能とモデルがこれをどのようにサポートするかについて説明します。
この記事は、This technical paper explains how Radar-Cross-Section (RCS) can be efficiently computed and analysed in Feko and how recently added features and models support this.(KB0124296) を翻訳したものです。 Feko 2024 の RCS および散乱シミュレーションの機能強化: コンポーネントライブラリに誘電体用CBFMと新しいRCSターゲットモデルを追加 レーダー断面積 (RCS) と散乱シミュレーションは、メッシュ作成ツールやジオメトリ…
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インバーターの熱解析と設計–Myway社インバーターでの検証
本記事はのThermal Analysis and Design of Inverters - The Myway Caseの日本語訳です。 インバーターとコンバーターは、電気自動車の充電と運転中のエネルギー管理にとって重要なコンポーネントであり、特有の熱管理が必要です。さもなければ、システム内の高熱負荷が熱暴走につながる可能性があり、車両、バッテリー、充電ステーションを損傷させ、乗員にとっても安全でなくなる可能性があります。 電力変換装置の熱管理には二つの課題があります。 * パワー半導体デバイスの正確な損失計算（温度依存性） * 形状、空気の流れ、熱経路の複雑さ…
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Thermal Analysis and Design of Inverters - The Myway Case
Inverters and converters are critical components for electric vehicle charging and energy management during operation that require specific thermal management. Otherwise, high heat loads in the system can lead to thermal runaway, which can damage the vehicle, batteries, charging stations, and can be unsafe for the…
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SIMP vs Level Set Topology Optimization
Topology optimization is a mathematical technique that produces an optimized shape and material distribution for the given design domain, loading, boundary conditions and performance targets (mass, displacement, stress etc.) of the structure. The finite element method is typically used to discretize the structure. The goal…
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Spherical Wave Expansion (SWE) - Using this technology in Feko
How to use Spherical Wave Expansion in Feko Do You know Spherical Wave Expansion (SWE), and would like to find out how you can use this technology in Feko? Then you should read on now. The following illustrative examples show how SWE can be defined and calculated in Feko and for what kind of problems this approach is…
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OptiStruct Explicit: Crashbox simulation
Crashbox are an important component in Crashworthiness. They allow to dissipate efficiently kinetic energy coming from a crash situation. They are widely used in automotive industry. OptiStruct Explicit enables to perform such studies efficiently. The goal of this article is to showcase OptiStruct capabilities with a…
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This technical paper explains how Radar-Cross-Section (RCS) can be efficiently computed and analysed in Feko and how recently added features and models support this.
Improved Functionality for RCS and Scattering Simulation in Feko 2024: Including CBFM for Dielectrics and new RCS target models in Component Library Radar Cross Section (RCS) and scattering simulation is one of the key applications of Feko thanks to a complete solution from meshing and geometry tools, through general and…
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SimSolid Solar Load: Revolutionizing Structural Analysis in Engineering
SimSolid Solar Load: Revolutionizing Structural Analysis in Engineering Sourav Das Senior Solution Engineer- GTT Simulation Driven Design In the realm of engineering, structural analysis plays a pivotal role in ensuring the safety, efficiency, and durability of various structures, ranging from bridges and buildings to…
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Altair Feko: CMA support for impedance boundary conditions and skin effects
As of the Feko 2023.1 release, the characteristic mode analysis (CMA) method is now able to support impedance boundary conditions and skin effect approximations. The skin effect approximation constitutes an efficient way to simulate thin material layers and shielding walls, while avoiding the full geometric modelling of…