基于STM32微处理器的IEEE1451标准模块设计

IEEE1451标准提出了一种通用的传感器接口标准,解决了传统传感器与各种网络相互不兼容的问题。本文以IEEE1451标准中IEEE1451.1和IEEE1451.2标准为基础,利用基于ARM Cortex技术的STM32微处理器多功能端口进行IEEE1451各功能模块的标准接口设计。包括在单只芯片中设计信号采集、处理和转换的A/D、CTC等前向通道,PWM、D/A、GPIO等构成后向通道,以及运用片内FLASH设计电子数据表单TEDS,并组成为智能变送器接口模块STIM。运用STM32丰富的串行总线接口,直接扩展CAN、RS232、RS485等现场总线以及10/100M的工业以太网络接口,组成网络匹配处理器NCAP模块。     

基于IEEE1451协议和ARM+DSP的网络适配处理器设计

基于智能化、网络化、IEEE1451标准的设计思想和ARM及DSP技术,提出了一种通用NCAP设计方案,其主要特点是：可在线实时编程,内嵌WEB-SERVER,支持以太网接口和本地高速USB接口。详细介绍NCAP的实现方法,并对其软硬件结构和功能做了具体阐述。     

Effect of weight,height and BMI on injury outcome in side impact crashes without airbag deployment

A comprehensive analysis is performed to evaluate the effect of weight, height and body mass index (BMI) of occupants on side impact injuries at different body regions. The accident dataset for this study is based on the National Automotive Sampling System-Crashworthiness Data System (NASS-CDS) for accident year 2000–08. The mean BMI values for driver and front passenger are estimated from all types of crashes using NASS database, which clearly indicates that mean BMI has been increasing over the years in the USA. To study the effect of BMI in side impact injuries, BMI was split into three groups namely (1) thin (BMI < 21), (2) normal (BMI 24–27), (3) obese (BMI > 30). For more clear identification of the effect of BMI in side impact injuries, a minimum gap of three BMI is set in between each adjacent BMI groups. Car model years from MY1995–1999 to MY2000–2008 are chosen in order to identify the degree of influence of older and newer generation of cars in side impact injuries. Impact locations particularly side-front (F), side-center (P) and side-distributed (Y) are chosen for this analysis. Direction of force (DOF) considered for both near side and far side occupants are 8 o’clock, 9 o’clock, 10 o’clock and 2 o’clock, 3 o’clock and 4 o’clock respectively. Age <60 years is also one of the constraints imposed on data selection to minimize the effect of bone strength on the occurrence of occupant injuries. AIS2+ and AIS3+ injury risk in all body regions have been plotted for the selected three BMI groups of occupant, delta-V 0–60 kmph, two sets (old and new) of car model years. The analysis is carried with three approaches: (a) injury risk percentage based on simple graphical method with respect to a single variable, (b) injury distribution method where the injuries are marked on the respective anatomical locations and (c) logistic regression, a statistical method, considers all the related variables together. Lower extremity injury risk appears to be high for thin BMI group. It is found that BMI does not have much influence on head injuries but it is influenced more by the height of the occupant. Results of logistic analysis suggest that BMI, height and weight may have significant contribution towards side impact injuries across different body regions.     

某车型前排座垫防下潜结构设计

座垫下潜是汽车正面碰撞中的一种常见现象,它是指正碰过程中因座盆变形而引起的座垫前端向下塌陷的现象.在国家强制认证试验中,允许座椅发生不增加乘员伤害程度的永久变形,但在NCAP星级评价过程中,座垫若下潜过大,座椅上的假人受到的伤害程度将加大,从而影响到NCAP的星级评定成绩.按照碰撞试验中对座椅性能的要求,对座垫防下潜的成因、影响及设计中的问题进行了分析,希望能对座椅的设计工作起到一定的参考作用.     

基于运动控制卡的多工位数控冲床控制系统的研究与应用

提出了一种基于工控机和运动控制卡的多工位数控冲压机床控制系统的设计方案。工控机作为上位机负责控制系统的非实时任务管理,而运动控制卡则用来负责完成运动控制中的实时任务。利用VC＋＋6．0为开发工具,开发出多工位冲床的数控系统,不仅能满足零件加工的高精度要求,还实现了产品的数控自动编程功能。     

网络化智能传感器标准IEEE 1451.2的TII协议研究

为了使传感器具有即插即用功能,IEEE 1451.2标准定义了STIM和NCAP之间的TII接口及其协议.从TII接口的物理管脚和信号定义出发,研究分析了触发、TII中读/写字节传输、读/写结构传输等协议,为基于IEEE 1451.2的网络化传感器的实用化做了一点基础工作.     

Influences of pre-crash braking induced dummy – Forward displacements on dummy behaviour during EuroNCAP frontal crashtest

Combination of active and passive safety systems is a future key to further improvement in vehicle safety. Autonomous braking systems are able to reduce collision speeds, and therefore severity levels significantly. Passengers change their position due to pre-impact vehicle motion, a fact, which has not yet been considered in common crash tests. For this paper, finite elements simulations of crash tests were performed to show that forward displacements due to pre-crash braking do not necessarily increase dummy load levels. So the influence of different pre-crash scenarios, all leading to equal closing speeds in the crash phase, are considered in terms of vehicle motion (pitching, deceleration) and restraint system configurations (belt load limiter, pretensioner). The influence is evaluated by dummy loads as well as contact risk between the dummy and the interior.     

汽车侧面碰撞胸部安全气囊优化研究

针对我国某款国产车型,基于该车型C-NCAP侧面碰撞试验和胸部气囊零部件试验,建立该车型胸部气囊侧面碰撞MADYMO子模型．分析该车型侧面碰撞试验中胸部存在的问题,结合计算机仿真,对胸部气囊进行了优化改进,并通过零部件试验和台车试验进行验证．试验结果表明,优化后的胸部气囊有效降低了假人胸部的伤害值,提高了侧面碰撞试验中假人胸部的得分．     

一种新型嵌入式系统在NCAP设计中的应用

分析了NCAP设计要求,探讨了NCAP中的存储器电路,以太网接口和嵌入式WEB服务器的设计.文中还介绍了NCAP在嵌入式WEB传感器的应用.     

IEEE 1451网络智能传感器技术研究

IEEE 1451标准族的目标是定义一套通用的通信接口,使变送器同微处理器、仪器系统或网络相连接,标准不仅允许厂家生产的传感器支持多种网络,还允许用户根据实际情况选择传感器和网络(有线或无线网络),并支持"即插即用".