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Finite Element Bus Rollover Test Verification 有限元客车侧翻试验验证
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i4.140
I. A. Hamid, K. Kamarudin, M. R. Osman, A. N. Abidin, Z. Zulkipli, Zulhaidi Mohd Jawi, M. Isa, M. S. Solah, A. Hamzah, A. H. Ariffin
This study is conducted to verify the rollover test of the finite element bus model. Verification is a process of determining that a computational model accurately represents the theoretical mathematical model and its solutions. In case of bus rollover simulation, the verification process is by looking into its energy balance, in which all energy associated with the bus rollover process must be equal and preserved before and after the rollover. Any energy imbalance indicates errors in the rollover process and must be rectified so that the errors remain in acceptable tolerance. The main energies involved in calculations are potential energy, kinetic energy, internal energy, contact energy, rigidwall energy, damping energy, hourglass energy, and total energy. The finite element bus model used is CONTRAST bus developed by CM/E Group, Politecnico di Milano. The rollover test standard used is UN R66, and the software used to set up and solve the simulation are LS-PrePost and LS- DYNA. Energy balance and energy ratio from the rollover simulation shows that the verification procedure is followed, results are within acceptable values, and the rollover test is verified.
本研究是为了验证有限元客车模型的侧翻试验。验证是确定计算模型是否准确地表示理论数学模型及其解的过程。在母线侧翻仿真中,验证过程是通过查看其能量平衡来进行的,其中与母线侧翻过程相关的所有能量必须在侧翻前后保持相等。任何能量不平衡都表明翻转过程中存在错误,必须加以纠正,使误差保持在可接受的公差范围内。计算中涉及的能量主要有势能、动能、内能、接触能、刚壁能、阻尼能、沙漏能和总能。所使用的有限元客车模型是由米兰理工大学CM/E集团开发的CONTRAST客车。采用UN R66标准进行侧翻试验,采用LS- prepost和LS- DYNA软件进行模拟设置和求解。从侧翻仿真的能量平衡和能量比来看,验证程序是遵循的,结果在可接受的范围内,验证了侧翻试验。
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引用次数: 1
Is Malaysia Ready to Adopt Autonomous Vehicles? 马来西亚准备好采用自动驾驶汽车了吗?
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i1.102
K. A. Abu Kassim, Z. Mohd Jawi, M. A. Nasruddin
Malaysia is a rapidly developing country with the potential for growth of future technologies. Autonomous Vehicle (AV) is one of these new technologies which evokes both excitement and apprehension among the general public. This paper shall discuss Malaysia's preparedness to accept AV on its roads. Finally, this paper will also explain the possible steps to facilitate efforts to have AVs on Malaysia's roads in the imminent future.
马来西亚是一个快速发展的国家,具有未来技术增长的潜力。自动驾驶汽车(AV)是这些新技术之一,引起了公众的兴奋和担忧。本文将讨论马来西亚在其道路上接受AV的准备。最后,本文还将解释可能的步骤,以促进在不久的将来马来西亚的道路上有自动驾驶汽车的努力。
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引用次数: 2
Safety Protocols for Electric Vehicles Crash Tests 电动汽车碰撞试验安全规程
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i2.112
N. Parera, O. Amor
Climate change and air pollution in the recent decade have become an increasingly important issue. This has led to the introduction of transportation policies in many countries to make vehicles more efficient by promoting the development and use of Electric Vehicles (EVs). According to the European Automotive Manufacturers Association, the registration of EVs has shown a substantial increase of 160.5%, prompting stakeholders to assume a realistic market share for new electrically chargeable vehicles to be in the range of two to eight percent by 2020 to 2025, based on today's market. Electric and hybrid vehicles are subject to the same passive and active safety standards as fossil fuel engine vehicles and so they have to pass crash tests defined by homologation regulations or other consumer standards such as Euro NCAP. Electric and hybrid vehicles also have to fulfil a few specific extra requirements added to the official standards; as they pose a potential danger after severe crashes due to the risk of electric shock from the battery. In this paper, the internal safety protocol applied for EV crash tests that is used at Applus IDIADA crash test laboratory is described and related with the principal risks of testing EVs. Moreover, an overview of the principal amendments of passive safety standards regarding EVs is presented.
近十年来,气候变化和空气污染已成为一个日益重要的问题。这导致许多国家出台了交通政策,通过促进电动汽车(ev)的开发和使用来提高车辆的效率。根据欧洲汽车制造商协会(European Automotive Manufacturers Association)的数据,电动汽车的注册量大幅增长了160.5%,这促使利益相关者认为,根据目前的市场状况,到2020年至2025年,新型电动汽车的市场份额将在2%至8%之间。电动和混合动力汽车与化石燃料发动机汽车一样,要遵守同样的被动和主动安全标准,因此它们必须通过由认证法规或其他消费者标准(如欧洲NCAP)定义的碰撞测试。电动和混合动力汽车还必须满足官方标准中增加的一些额外要求;因为它们在严重碰撞后会造成潜在的危险,因为电池有触电的风险。本文介绍了Applus IDIADA碰撞试验实验室用于电动汽车碰撞试验的内部安全协议,并将其与测试电动汽车的主要风险联系起来。此外,还概述了电动汽车被动安全标准的主要修订情况。
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引用次数: 0
Wireless Signal Propagation Analysis on Connected Autonomous Vehicle Test Bed in Northern Malaysia 马来西亚北部联网自动驾驶汽车试验台无线信号传播分析
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i3.126
M. A. Fadzilla, A. Harun, S. A. Bakar, M. Hashim, W. K. Wan, I. Ibrahim, A. R. Mahayadin, M. Rani, M. Isa
Connected and Autonomous Vehicle (CAV) technologies are among the most heavily researched automotive technologies in the industry with regards to making it more efficient and flexible for the user. This paper discusses the signal profile observed on connected autonomous vehicle testbed environment in an approved UniMAP Circuit. Wireless devices were used to perform channel measurements in such an environment. Data were collected and observation was recorded and analysed. The purpose is to analyse and evaluate signal propagation properties for the optimization of wireless roadside devices in CAV application such as junction controller. Two important paths have been chosen to represent the environment and transmitter to receiver communications were measured and characteristics are recorded at which Path 1 is on a tar road while Path 2 is a mix of gravel-tar-grass field. The result shows that both paths show an abrupt decrease in signal power for the first 10 m showing the diffusion region of signal propagation and then starts to fluctuate between -62 dBm and -93 dBm for Path 1 while it fluctuates between -44 dBm and -79 dBm for Path 2. From these results, we can conclude that the performance of the signal profile differs relative to the different surfaces they propagate. These results will definitely have a major effect in the application of any Vehicle-to-Infrastructure (V2I) technologies in regards to signal propagation being analysed beforehand, making sure that the signal transmission works at its best.
联网和自动驾驶汽车(CAV)技术是业内研究最多的汽车技术之一,因为它对用户来说更高效、更灵活。本文讨论了在经批准的UniMAP电路中,在网联自动驾驶汽车试验台环境中观测到的信号分布。无线设备被用来在这样的环境中进行信道测量。收集数据,记录观察结果并进行分析。目的是分析和评估自动驾驶汽车应用中无线路边设备(如路口控制器)的信号传播特性。选择了两条重要的路径来表示环境,并测量了发射器到接收器的通信并记录了特征,其中路径1在沥青路面上,而路径2是砾石-沥青-草地的混合物。结果表明,在信号传播的扩散区域,两条路径的信号功率在前10 m都出现突然下降,然后开始在路径1的-62 dBm和-93 dBm之间波动,路径2的信号功率在-44 dBm和-79 dBm之间波动。从这些结果中,我们可以得出结论,信号剖面的性能相对于它们传播的不同表面而不同。这些结果肯定会对任何车辆到基础设施(V2I)技术的应用产生重大影响,因为事先要对信号传播进行分析,确保信号传输达到最佳状态。
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引用次数: 0
Scene Barrier Effects on Vehicle Deceleration Rate during Primary Accident in a Suburban Area 场景屏障对城郊初事故车辆减速率的影响
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v2i3.98
M. Rani, S. A. Abu Bakar, M. Hashim, A. Harun, Z. Razlan, W. K. Wan, I. Zunaidi, I. Ibrahim, M. Afendi, N. Efi, Y. Ahmad, M. Dalib, S.S. Mat Rudin
This study uses a simulation of primary accident to investigate the scene barrier effects on vehicle deceleration rate in the suburban area to assess driver behaviour. Several conditions were designed and experimented to determine the capability of scene barrier, which included free flow traffic without an accident, an accident without scene barrier and an accident with scene barrier. The vehicle deceleration rate was investigated by collecting speed-time data in normal traffic zone and rubbernecking zone. Results found that the average vehicle deceleration rate reached as high as - 1.93 km/h/s in rubbernecking zone compared to normal traffic zone (as high as - 0.49 km/h/s) especially when an accident was simulated without the scene barrier. Introduction of scene barrier during the simulated accident improved traffic flow and reduced rubbernecking phenomena by improving the average vehicle deceleration rate in rubbernecking zone by up to 43.0 %. However, sudden deceleration cannot be totally eliminated during the simulated accident with the scene barrier due to driver behaviour. For optimization of braking time during a primary accident, a study of the algorithm of Autonomous Emergency Braking (AEB) system is necessary.
本研究通过对原发事故的模拟研究,探讨了场景屏障对郊区车辆减速率的影响,以评估驾驶员行为。设计并试验了无事故自由流交通、无事故现场和有事故现场三种场景屏障能力条件。通过采集正常交通区域和绕行区域的速度-时间数据,对车辆的减速率进行了研究。结果发现,与正常交通区(- 0.49 km/h/s)相比,在没有现场护栏的情况下模拟事故时,“抢胶区”的车辆平均减速率高达- 1.93 km/h/s。在模拟事故中引入场景屏障改善了交通流量,减少了行人围观现象,使行人围观区车辆平均减速率提高了43.0%。然而,由于驾驶员行为的原因,在有现场障碍物的模拟事故中,不能完全消除突然减速现象。为了优化初次事故时的制动时间,有必要研究自动紧急制动(AEB)系统的算法。
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引用次数: 1
Calculating the Brake-Application Time of AEB System by Considering Maximum Deceleration Rate during a Primary Accident in Penang's Urban Road 槟榔屿城市道路一次主要事故中考虑最大减速度的AEB系统制动时间计算
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i3.130
M. Rani, S. A. Abu Bakar, M. Hashim, A. Harun, Z. Razlan, W. K. Wan, I. Zunaidi, I. Ibrahim, M. Afendi, N. Efi, M. Dalib, S.S. Mat Rudin
An experimental study of the brake-application time of Autonomous Emergency Braking (AEB) system considering the primary accident in an urban area was proposed. Since the functionality of the brake-application time is varied between manufacturers and models, the brake-application time of AEB system must be verified based on driving behaviour in Malaysia. A primary accident was simulated to acquire vehicle deceleration rate in real condition by driving an ego vehicle at a different set of vehicle speeds. The study is focussed on the urban roads in the north region of West Malaysia, i.e. Penang. As a benchmark in this study, the brake-application time (2.6 s) introduced by Mercedes-Benz in the PRE-SAFE® Brakes technology was referred. A new braking permission time was proposed by calculating a minimum deceleration distance and Time-to-Collison (TTC) confirmation time required to brake based on maximum deceleration when a primary accident was simulated. It was found that the brake-application time recommended for the AEB system, specifically AEB City conveys the real driving condition of Penang when a primary accident happens in the urban area. To have a smooth braking and an optimum braking performance during a primary accident, the Forward Collision Warning (FCW) should be activated at TTC ≤ 4.6 s. The partial braking (PB) should be activated automatically when the TTC is approximately 2.9 s. While the automated full braking (FB) phase should begin when the TTC reaches 1.1 s.
提出了考虑城市主要事故的自动紧急制动(AEB)系统制动时间的实验研究。由于制动时间的功能因制造商和车型而异,因此必须根据马来西亚的驾驶行为验证AEB系统的制动时间。通过模拟一次主要事故,在不同的车速下驾驶自我车辆,获得真实情况下的车辆减速度。研究的重点是在西马来西亚北部地区,即槟城的城市道路。作为本研究的基准,我们参考了梅赛德斯-奔驰在PRE-SAFE®Brakes技术中引入的制动时间(2.6 s)。在模拟一次事故时,通过计算最大减速度下制动所需的最小减速距离和TTC确认时间,提出了一种新的制动许可时间。研究发现,对于AEB系统,特别是AEB City,建议的制动时间传达了槟城在市区发生主要事故时的真实驾驶状况。为了在主要事故中获得平稳制动和最佳制动性能,应在TTC≤4.6 s时激活前向碰撞警告(FCW)。部分制动(PB)应在TTC约为2.9秒时自动启动。而自动全制动(FB)阶段应在TTC达到1.1 s时开始。
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引用次数: 0
The Key Challenges of Implementing E-Learning in Engineering Training Programs 在工程培训项目中实施电子学习的主要挑战
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v2i3.100
S. Yahaya
Developing an effective e-learning program is a great challenge since there are several tools, technologies and approaches to be considered. Industry pioneers mainly agree that e-learning will continue to become a driving force in the business sector; but apart from the many issues in designing and developing such a program, the industry is also faced with the challenges in overcoming other problems which will be discussed in this article.
开发有效的电子学习计划是一项巨大的挑战,因为需要考虑多种工具、技术和方法。业界先驱者普遍认为,电子学习将继续成为商业领域的推动力;但是,除了在设计和开发这样一个程序中的许多问题之外,该行业还面临着克服其他问题的挑战,这些问题将在本文中讨论。
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引用次数: 4
A Longitudinal Analysis of Traffic-Violation Behaviours among Two Groups of Motorcyclist in Bandung, Indonesia 印度尼西亚万隆两组摩托车手交通违规行为的纵向分析
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i2.119
T. B. Joewono, S.D. Legi, A. Tarigan
The capability and limitations of car drivers or motorcyclists are believed to change over time as a response to external and internal triggers. As a fact, studies regarding behaviour of young motorcyclists from developing countries are very rare while motorcyclists from developed and developing are believed as different. This study aims to explore the change of behavior of young motorcyclists in committing traffic violations in urban areas from experience in developing countries. Analyses employed datasets collected using questionnaire survey from Bandung, Indonesia from two periods, namely 2010 and 2017. Comparison analyses were completed to compare traffic violations attributes between the two datasets. Two causal models from two data collections were estimated using structural equation modelling to analyse the influencing factors to traffic violations as well as to analyse the relationships of influencing factors, characteristics of motorcyclist, and type of violations. Between the two datasets it is found the difference of the type of violations which implies the change of attitudes in committing traffic violations, while the change of causal relationships is not found in the models. This study confirms the flexibility of behavior change in riding motorcycles between young motorcyclists, while relationships among constructs seem more stable.
据信,汽车司机或摩托车手的能力和限制会随着时间的推移而变化,这是对外部和内部触发因素的反应。事实上,关于发展中国家年轻摩托车手行为的研究非常少,而发达国家和发展中国家的摩托车手被认为是不同的。本研究旨在从发展中国家的经验出发,探讨城市地区年轻摩托车手交通违规行为的变化。分析采用2010年和2017年两个时期在印度尼西亚万隆进行问卷调查收集的数据集。完成对比分析,比较两个数据集的交通违规属性。利用结构方程模型对两个数据集的两个因果模型进行了估计,分析了交通违规的影响因素,并分析了影响因素与摩托车驾驶员特征和违规类型之间的关系。在两个数据集之间发现了违规类型的差异,这暗示了交通违规态度的变化,而在模型中没有发现因果关系的变化。这项研究证实了年轻摩托车手在骑摩托车时行为改变的灵活性,而构念之间的关系似乎更稳定。
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引用次数: 4
Child Occupant Safety: Towards Implementation of Child Restraint System Law in Malaysia 儿童乘员安全:马来西亚儿童约束制度法律的实施
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i3.132
N. F. Paiman, Y. Ahmad, N. Borhan, K. A. Abu Kassim, S. Ishak
The World Health Organization (WHO) has consistently recommended that all countries regardless of their income add the requirement for Child Restraint System (CRS) to their traffic regulations in order to promote road safety. Malaysia is adopting the CRS regulation in 2020. This paper aims to discuss the readiness and mapping of the roadmap towards the implementation of the law. In a temporal view of road crashes, CRS was part of 'during-crash' passive safety components i.e. to provide protection during the crash impact phase. This analysis includes the CRS benefits and issues, related road safety strategic programmes, the current legal framework, and local research findings based on observational studies. CRS usage and acceptance are on the rise, although still at a nascent stage. This situation can be considered as 'below satisfactory compliance level', hence a more inclusive solution is needed, including the introduction of technology, to influence or compel parents to ensure their children are always secured by CRS while on the road.
世界卫生组织(世卫组织)一贯建议所有国家,无论其收入如何,在其交通法规中增加儿童约束系统(CRS)的要求,以促进道路安全。马来西亚将于2020年采用CRS法规。本文旨在讨论该法律实施路线图的准备和绘制。在道路碰撞的时间视图中,CRS是“碰撞期间”被动安全组件的一部分,即在碰撞冲击阶段提供保护。该分析包括CRS的好处和问题、相关的道路安全战略规划、当前的法律框架以及基于观察性研究的地方研究结果。CRS的使用和接受度正在上升,尽管仍处于初级阶段。这种情况可被视为“低于令人满意的合规水平”,因此需要一个更具包容性的解决方案,包括引入技术,以影响或迫使父母确保他们的孩子在路上始终受到CRS的保护。
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引用次数: 1
Priority Factor Influencing Public Interest in Owning Vehicle with AEB System 影响公众拥有AEB汽车利益的优先因素
Pub Date : 2021-04-29 DOI: 10.56381/jsaem.v3i2.114
N. H. Mokhtar, L. Hamzah, H. Mamat, M. Nor, F.A. Munir
The Autonomous Emergency Brake (AEB) is a part of autonomous vehicle technologies and the technology was developed to reduce human errors that lead to a road accident. This survey investigates the priority factor influencing the public in acquiring vehicles with the AEB system. In this study, the Analytic Hierarchy Process (AHP) framework was used to determine the public’s rating of importance of the availability of the AEB system in their vehicles. Cronbach’s alpha was used to check for reliability of survey items. With a score of 0.8, it suggested that the items had relatively high internal consistency. The results show that the top factors that influence public interest in having vehicle with AEB are the reduction of the severity of injury and crashes.
自动紧急制动(AEB)是自动驾驶汽车技术的一部分,该技术是为了减少导致交通事故的人为失误而开发的。本调查调查了影响公众购买装有AEB系统车辆的优先因素。在本研究中,采用层次分析法(AHP)框架来确定公众对其车辆中AEB系统可用性的重要性评级。Cronbach’s alpha用于检验调查项目的信度。得分为0.8,表明这些项目具有较高的内部一致性。结果表明,影响公众对AEB车辆兴趣的首要因素是降低伤害和碰撞的严重程度。
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引用次数: 2
期刊
Journal of the Society of Automotive Engineers Malaysia
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