This slide is describing how to set up the OpenFOAM simulations including rotating geometries.
The SRF (Single Rotating Frame) is covered and MRF (Multiple Reference Frame).will be covered in it.
This slide is describing how to set up the OpenFOAM simulations including rotating geometries.
The SRF (Single Rotating Frame) is covered and MRF (Multiple Reference Frame).will be covered in it.
This slide is a trail CHT analysis for relatively complex bodies with chtMultiRegionFoam which is an solver of OpenFOAM. Two methods to make mesh are explained.
This slide is a trail CHT analysis for relatively complex bodies with chtMultiRegionFoam which is an solver of OpenFOAM. Two methods to make mesh are explained.
Flow and Noise Simulation of the NASA Tandem Cylinder Experiment using OpenFOAMCon Doolan
15th AIAA/CEAS Aeroacoustics Conference.
The NASA Tandem Cylinder experiment has been simulated for the case where the cylinders were placed 3.7 diameters apart (center-to-center). This configuration allows vortex shedding to occur in the inter-gap region between the cylinders. Two-dimensional, unsteady Reynolds averaged Navier Stokes flow simulations were performed using the OpenFOAM open source code. Simulated mean and unsteady flow results compare well with published experimental data. The major discrepancies between numerical and experimental flow results can be attributed to neglecting the spanwise velocity component during simulation. Acoustic computations were made using two-dimensional flow data and a compact form of Curle's theory with spanwise and temporal statistical models that introduced random perturbations into the time-domain signals. The upper and lower frequency limits of the acoustic simulation method were selected using arguments based on acoustic compactness and an estimate of near-field acoustic effects. Acoustic simulation results compare well with experiment about the main tone. Further improvements are necessary to broaden tones at the harmonics.
A first order hyperbolic framework for large strain computational computation...Jibran Haider
An explicit Total Lagrangian momentum-strains mixed formulation in the form of a system of first order hyperbolic conservation laws, has recently been published to overcome the shortcomings posed by the traditional second order displacement based formulation when using linear tetrahedral elements.
The formulation, where the linear momentum and the deformation gradient are treated as unknown variables, has been implemented within the cell centred finite volume environment in OpenFOAM. The numerical solutions have performed extremely well in bending dominated nearly incompressible scenarios without the appearance of any spurious pressure modes, yielding an equal order of convergence for velocities and stresses.
To have more insight into my research, please visit my website:
http://jibranhaider.weebly.com/
OpenFOAM for beginners: Hands-on trainingJibran Haider
NOTE: A NEW VERSION OF THIS PRESENTATION IS AVAILABLE ON MY RESEARCH GATE ACCOUNT
(https://www.researchgate.net/publication/327594760_OpenFOAM_course_for_beginners_Hands-on_training)
OpenFOAM is an open source Computational Fluid Dynamics software package based on C++ programming language within the context of cell centred Finite Volume Method. It is developed primarily by OpenCFD Ltd and distributed by OpenCFD Ltd and the OpenFOAM Foundation.
Disclaimer:
This offering is not approved or endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software and owner of the OPENFOAM® and OpenCFD® trade marks. "
【DLゼミ】XFeat: Accelerated Features for Lightweight Image Matchingharmonylab
公開URL:https://arxiv.org/pdf/2404.19174
出典:Guilherme Potje, Felipe Cadar, Andre Araujo, Renato Martins, Erickson R. ascimento: XFeat: Accelerated Features for Lightweight Image Matching, Proceedings of the 2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR) (2023)
概要:リソース効率に優れた特徴点マッチングのための軽量なアーキテクチャ「XFeat(Accelerated Features)」を提案します。手法は、局所的な特徴点の検出、抽出、マッチングのための畳み込みニューラルネットワークの基本的な設計を再検討します。特に、リソースが限られたデバイス向けに迅速かつ堅牢なアルゴリズムが必要とされるため、解像度を可能な限り高く保ちながら、ネットワークのチャネル数を制限します。さらに、スパース下でのマッチングを選択できる設計となっており、ナビゲーションやARなどのアプリケーションに適しています。XFeatは、高速かつ同等以上の精度を実現し、一般的なラップトップのCPU上でリアルタイムで動作します。
セル生産方式におけるロボットの活用には様々な問題があるが,その一つとして 3 体以上の物体の組み立てが挙げられる.一般に,複数物体を同時に組み立てる際は,対象の部品をそれぞれロボットアームまたは治具でそれぞれ独立に保持することで組み立てを遂行すると考えられる.ただし,この方法ではロボットアームや治具を部品数と同じ数だけ必要とし,部品数が多いほどコスト面や設置スペースの関係で無駄が多くなる.この課題に対して音𣷓らは組み立て対象物に働く接触力等の解析により,治具等で固定されていない対象物が組み立て作業中に運動しにくい状態となる条件を求めた.すなわち,環境中の非把持対象物のロバスト性を考慮して,組み立て作業条件を検討している.本研究ではこの方策に基づいて,複数物体の組み立て作業を単腕マニピュレータで実行することを目的とする.このとき,対象物のロバスト性を考慮することで,仮組状態の複数物体を同時に扱う手法を提案する.作業対象としてパイプジョイントの組み立てを挙げ,簡易な道具を用いることで単腕マニピュレータで複数物体を同時に把持できることを示す.さらに,作業成功率の向上のために RGB-D カメラを用いた物体の位置検出に基づくロボット制御及び動作計画を実装する.
This paper discusses assembly operations using a single manipulator and a parallel gripper to simultaneously
grasp multiple objects and hold the group of temporarily assembled objects. Multiple robots and jigs generally operate
assembly tasks by constraining the target objects mechanically or geometrically to prevent them from moving. It is
necessary to analyze the physical interaction between the objects for such constraints to achieve the tasks with a single
gripper. In this paper, we focus on assembling pipe joints as an example and discuss constraining the motion of the
objects. Our demonstration shows that a simple tool can facilitate holding multiple objects with a single gripper.
6. 6
変数の最大値・最小値の計算
minMax
{
// Type of functionObject
type
// Where to load it from (if not already in solver)
functionObjectLibs
// Function object enabled flag
enabled
// Log to output (default: false)
log
// Write information to file (default: true)
write
// Fields to be monitored - runTime modifiable
fields
(
U
p
);
}
fieldMinMax
fieldMinMax;
("libfieldFunctionObjects.so");
true;
true;
true;
“fields” に指定した変数
の最大値・最小値を計算
することができます.
セル中心値だけではなく
境界値も含めた値が
算出されます.