측면 충돌 시 차량의 충돌 위치 및 충돌 각도에 따른 차량 및 승객 거동

배준석,김호,소영명 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.2

As the autonomous vehicle is to come to the commercial market, passive safety of the vehicles becomes ever more important, since more responsibility of the car crash accidents will be imposed on the car makers. To cope with such a requirements, comprehensive studies are under progress in car OEM’s as well as relevant institutes. In this study FE models of two identical family sedans are utilized to investigate the effect of crash parameters like crash impact locations, and impact angle. Relationship between structural behavior of the car and the dummy injury measures is studied.

어린이 통학버스의 신규 등화장치에 대한 수용성 요인분석

성기영,김재철,신판주,김현 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

The study aims to introduce three new lighting device technologies designed to improve the visibility and awareness of stopped school buses, especially during nighttime, to enhance the safety of children boarding and disembarking. Recent accidents involving various school transportation vehicles underscore the need for effective child safety signals. Analysis of traffic accident data from the Korea Road Traffic Authority’s system indicates significant differences between daytime and nighttime incidents. Existing research suggests current lighting devices are inadequate in safeguarding children. Therefore, the study seeks to propose new technologies that better alert surrounding drivers to stopped school buses, compared to existing devices, and explore factors influencing the adoption of technologies like road projections, VMS, and line lamps.

자동긴급제동 시 탑승자 거동을 고려한 슬레드 시험 방안의 해석적 연구

소영명,김호,배준석 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

Due to its good repeatability and reproducibility, sled test is an effective way to study the occupant behavior during car crash but sled test is not suitable to simulate long term events (>1000 msec) such as autonomous emergency braking (AEB) which accompanies over 1 second of braking stage before crash. The behavior of dummies at different AEB levels are assessed using the Hybrid-III 50% male dummy and 5% female dummy FE models. Behavior of dummies are studied at different postures like normal posture, relaxed posture, and long-sliding relaxed posture. Dummy behavior from prepositioning (presetting the dummy as dummy will be positioned after AEB activation) and that from full event simulation which includes AEB activation as well as crash will be compared to check the effectiveness of prepositioning. Furthermore, based on the observation that the forward excursion of dummy head remains at a certain level with the lapse of time, we evaluated the applicability of time-shortened pulses method as well. Prepostioning method can be applied to normal posture, but it is not applicable to the relaxed posture, and it is confirmed that it can be corrected by applying the time-shortened pulses method.

친환경 차량의 제동 정숙성을 위한 브레이크 디스크의 열변형 강건성 향상에 관한 연구

심재훈,황세라,전갑배,공창섭 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

Braking judder vibration caused by thermal deformation of disc has been a major problem in brake system for a long time and many researchers have analyzed its mechanisms and developed solutions. However, judder vibration still occurs due to harsher vehicle driving conditions like increased power of EV (Electric Vehicle) and various environmental characteristics. In particular, in the case of eco-friendly vehicles such as EV, it is predicted that judder vibration will become a bigger problem due to the quiet driving condition compared to ICE (Internal Combustion Engine) vehicles. In addition, existing studies on judder vibration have been focused on the capacity and thermal deformation of the braking friction surface. So, the influence analysis of thermal deformation on the non-friction surface of the brake disc is relatively insufficient. In this study, we attempt to secure braking characteristics that are insensitive to thermal deformation in terms of the non-friction surface of the disc, focusing on the coning characteristic that occurs during braking thermal deformation. For this purpose, various factors of the non-friction surface of the disc are analyzed using robust design. The design standard for the robustness of the brake disc against judder vibration is proposed through the research results.

Attention이 적용된 LSTM-Autoencoder 알고리즘을 사용한 차량 주행 패턴 시각화

이수천,우태걸,신동훈,박강문 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

Recent advancements in vehicle driving data analysis have attracted significant attention as a key research area aimed at optimizing driving behavior and enhancing vehicle performance. This study aims to collect operational data from drivers, including steering angle, longitudinal acceleration, brake usage, and wheel speed, and to cluster driving segments based on their characteristics using deep learning techniques. To achieve this, we employed a methodology that integrates the LSTM-Autoencoder model, which captures essential features of time-series data through compression and reconstruction, with an Attention mechanism. The driving segments were clustered and visually represented with distinct colors for clarity. Experimental results from the proposed approach demonstrated an over 96% accuracy in aligning input and output values, facilitating the clustering of driving segments based on their distinctive features. These findings provide valuable insights for improving driver behavior and optimizing vehicle assistance systems, potentially contributing to significant advancements in this field of research.

도심 자율주행을 위한 V2I Fail-Operational 안전컨셉 설계

신성근,박종기,예창민,우창수,박종우,이혁기 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

Ensuring an automated fallback strategy in response to malfunctions during the execution of the Dynamic Driving Task (DDT) is imperative for Level 4 autonomous driving systems. While Triple Modular Redundancy (TMR) represents a prominent Fail-Operational structure, its practical application to multiple systems is constrained by the substantial increase in costs. In this paper, we propose a pragmatic Fail-Operational safety concept utilizing on-board camera sensors and the Vehicle-to-Infrastructure (V2I) communication module, known as the On-Board Unit (OBU), to provide traffic signal information within the vehicle. The viability of the designed safety concept is validated through error injection simulations. This approach addresses the practical limitations associated with applying Fail-Operational functionality to numerous systems due to the considerable cost escalation. Leveraging camera sensors and V2I communication modules presents a practical and cost-effective solution for maintaining operational safety in Level 4 autonomous driving systems, particularly when responding to malfunctions in the DDT.

Lv.4 자율주행자동차 보험제도 관련 법 개정 방안에 관한 연구

김규현,기승도,윤영한 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

In this study, it was proposed to apply the existing driver liability and compulsory automobile insurance system applied to general cars and Level 3 automated vehicles in relation to the responsibility of autonomous driving, ensuring safety, and strengthening accident liability, and to establish a definition of an autonomous driving supervisor who remotely supports autonomous driving and to purchase liability insurance. In addition, in the case of an autonomous vehicle accident caused by the intentional or negligent act of the autonomous driving supervisor, an amendment was proposed to allow insurance companies to compensate for damages to the person legally liable for damages, and an amendment to define the autonomous driving supervision insured and add it as an insured.

수소전기차 내압용기 안전성 강화를 위한 안전 벨류 체인 연구

이준석,김영현,한성길,김호경,오태석 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

As the importance of eco-friendly carbon neutrality is emphasized around the world, hydrogen-electric vehicles are expected to grow rapidly, and as of July 2003, Korea has 32,500 hydrogen cars and 363 hydrogen vans. Hydrogen cars have the advantage of short charging time and long mileage. However, the safety issue of internal pressure-resistant tank is still one of the important challenges in this field. To improve this, the establishment of a safety value chain to strengthen safety is the key. In this study, a method of developing and applying a safety value chain was studied to reinforce the safety of hydrogen-resistant tank. This study is expected to contribute to the expansion of safe and reliable hydrogen supply by actively applying these safety strategies to the hydrogen electric vehicle industry.

USNCAP 정면충돌시험을 이용한 외상성 뇌손상에 관한 고찰

문병준,임재문 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.3

This study is to review the Brain Injury Criterion (BrIC) and the brain injury probabilities due to the Traumatic Brain Injury (TBI). For this purpose, the frontal impact test results of 20 vehicles from MY2022 and MY2023 USNCAP are utilized for estimating the BrIC and the brain injury probabilities. Using the equations suggested by Takhounts et al., the BrIC results were calculated. Using the equations suggested by Hazay et al., the brain injury probabilities were estimated. The brain injury probabilities based on the maximum principal strain (MPS) were largely estimated than those based on the cumulative strain damage measure (CSDM).

차량 제동장치 부적합 재현에 따른 제동 지연 및 약화 현상 분석에 대한 실험적 연구

고성재,박원덕,박정수,송혜지 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.4

Under the current Motor Vehicle Management Act, braking systems are managed as vehicle inspection standards and have been continuously implemented for traffic safety of driving. We would like to conduct an experiment to analyze the actual effectiveness of the braking system inspection, and analyze the effectiveness of the experiment to present the importance of the braking system inspection. We will analyze the experimental results before and after the failure by artificially creating a failure in the braking system using the actual vehicle. First of all, we present the process of selecting the braking system as the subject of an nonconformity experiment, and determine the method of reproducing the braking system failure. Next, on-site braking experiments are conducted by conditions such as braking start speed, braking force, failure conditions for each braking system direction (left wheel or right wheel), and road surface conditions. Finally, we will conclude this study by organizing the test effectiveness (cost, risk, etc.) analysis based on the results of the ex periment.