A Research for AI driven Advanced Performance Evaluation of Exterior Closure System

SOONHO HER･MINHYUNG BYUN･BYUNG SUNG PARK (Hyundai Motor)

To evaluate closure system performance in advance before PROTO/PILOT stage, data for each design parameter involved in certain system is necessary. For implication of data driven advanced evaluation within closure systems, estimation about cabin pressure rise and air bind resistance energy is required. In this paper, cabin pressure rise and air bind resistance energy occurred by slamming door, tailgate or trunk could be estimated by analysis of simple box model and statistical model calibration and validation. With this estimation process, utilizing deep learning technology would be a powerful solution for proto-less and virtual vehicle development to optimize design parameters in advance.

3次元形状生成AIの解釈性に基づく自動車空力開発の検討

池内　大貴・森國　洋平・谷口　真潮・伊藤　祐太・深尾　勇也・山下　裕矢・安岡　志朗・菅井　友駿・西川　幸治・土山　稔（トヨタ自動車）

自動車空力開発において，計算コスト削減に深層学習を用いた形状生成AIを活用し空力性能評価を迅速に行う手法が検討されている．しかし，形状生成AIは解釈性が低いためモデルや適応範囲の妥当性推定が課題である．本稿では形状生成AIに対する形状特徴の寄与値を算出する手法を取り入れ，視覚的分析から解釈性向上を検討する

Tesla Cybertruck Aerodynamics - A fully automated reverse engineering methodology using 3D Scanning and OpenFOAM

Wouter Remmerie･Nikola Majksner (AirShaper)

Analyzing and understanding the aerodynamics of existing cars is key to improving the shape and efficiency of new cars. 3D scanning is commonly applied to obtain 3D models of cars, but these models pose significant challenges for CFD (computational fluid dynamics) methods - these typically require simplified and watertight models. This paper presents key aspects of a fully automated and validated workflow to analyze the aerodynamics of 3D scans without any manual efforts. The workflow has been validated against wind tunnel test data and has been endorsed by OEMs.

6 Bar Link Operation Analysis Using Multi-body Dynamics

woosik Yoon･Minsu Kim･Sungwon Hong･Jaehyun Seo (DAEDONG HI-LEX)･Kihyun Choi (Hyundai Motors Namyang Laboratory)

With the luxury of automobiles, it is developing from a general side door to a coach door. Since this coach door has a structure without a b-pillar, it requires a lot of rigidity and safety. To this end, a door hinge that can open 0-180 degrees was developed using a six-section link. In this study, the behavior of the 6bar link was analyzed with a Multi-body dynamic. Through this, the operation abnormality according to the distance between the moving pin and the fix pin was confirmed, and a system that improved this could be developed.

ディスクブレーキの引きずりトルク低減に関する考察 （第2報）

井上　卓巳・平嶋　亮雅・宮原　直也・山崎　悠平・清水　貴之・加藤　佑介（アドヴィックス）

ディスクブレーキにおいて燃費・電費に貢献する特性の一つに引きずりトルクがある．
本報告では市街地走行時の引きずりトルク低減を目的に風の流れが引きずりトルクへ与える影響をCFD解析によって定量化し，引きずりトルクの現象解明と予測技術に繋げ，安定的ゼロ引きずりの設計手法を報告する．

Establishment of target aero drag and investment criteria considering vehicle characteristics

WOOKHYUN HAN･KWANG CHAN KO (Hyundai Motor)

The major resistance to vehicle driving energy, known as aero drag, is directly linked to fuel efficiency improvement. To achieve efficient aerodynamic performance development for xEV vehicles with a short history, it is necessary to establish the quantitative relationship between aero drag and fuel efficiency. In this study, we analyze the impact of aero drag reduction on fuel efficiency in internal combustion engines and xEV vehicles. Furthermore, we analyze the aero drag and fuel efficiency effects based on vehicle driving profiles and weights, propose target aero drag, and make decisions on the investment in various aero drag reduction-related items.