摘要：
The relay-node selection plays a decisive impact on the message dissemination in vehicular network. However, in some scenarios, due to lack of the reliable and stable relay-node selection, the message dissemination suffers from an intolerable delay, even a failure. In this paper, we focus on a design of the robust relay selection, which aims at (1) achieving a maximum message dissemination speed in general scenarios, and (2) assuring an acceptable dissemination speed in the adverse scenario. Two adverse scenarios are first introduced for the message dissemination when the distance-based relay selection is applied in multi-hop broadcast. To tackle the challenge, we propose a robust distance-based relay selection by optimizing the exponent-based partitioning broadcast protocol (our previous work) and incorporating a proposed mini-black-burst-assisted mechanism. Moreover, we develop analytic models for the robust approach performances in terms of contention latency and packet delivery ratio (PDR). Simulations are used to verify these analytic models, demonstrate the acceptable performances of the proposal in adverse scenarios, and compare it with the state-of-the-art approaches in general scenarios. Results show an increase of more than 11.01% in terms of message dissemination speed independent of vehicle density and a stable PDR of more than 99.99%.
作者机构：
[Wei-guo G.; Wei-Song W.; Ling-Tao W.; Da-Wei Z.; Jin-He L.] Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, 300354, China;School of Mechanical Engineering, Hebei University of Technology, Tianjin, 300354, China;[Xiang-Yang Q.] School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin, 300354, China;[Teng L.] Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, 300354, China, School of Mechanical Engineering, Hebei University of Technology, Tianjin, 300354, China
通讯机构：
[Wei-guo, G.] K;Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, China
摘要：
为了解决纯电动汽车正面碰撞安全性差的问题,文章提出了一种综合考虑5种典型碰撞工况下整车优化区域以及动力电池布置分析的多目标耐撞性拓扑优化方法.基于混合元胞自动机(hybrid cellular au-tomata,HCA)算法,耐撞性拓扑优化以单元相对密度为设计变量、结构内能密度分布统一为目标,运用固体各向同性微结构材料惩罚模型(solid isotropic material with penalization model,SIMP)下的变密度法进行材料分布;迭代收敛后,最终得到了传力路径优越、构型明朗清晰的耐撞性车身结构,同时得到符合整车性能要求的吸能纵梁形状.对优化后的整车模型进行的耐撞性验证表明,该优化结构让碰撞加速度与结构变形量同步最优化,大大增加了纯电动汽车正面碰撞的安全性,优化出的抗撞结构为纯电动汽车正面耐撞性设计提供了一定的参考.
关键词：
Fuzzy control;active suspension;automotive electronic control
摘要：
With the development of science and technology and the improvement of people's living standard, the car has become an indispensable tool in people's life. People have higher requirements on the stability, safety, and comfort of the vehicle. Moreover, how to design the suspension system with excellent performance has always been the research focus of the relevant institutions at home and abroad. Based on this, starting from the role of automotive suspension, the control methods were divided into the active, passive, and semi-active way. The control mode of the automotive electronic control system was studied, and the sensor, switch, signal and other components of the active electronic control system also were studied. The mathematical model of the active suspension system was built, and the application of fuzzy control in automotive electronic control suspension system was researched. The simulation experiment was carried out by digital simulation, and the effect was studied and analyzed. The practice has proved that the design of automotive electronic control suspension system based on digital simulation can effectively reduce the vibration of the automobile and improve the quality of the automobile, which will become a siginicate direction of future automotive research.
