农用车辆智能安全系统中的超声波测距

农用车智能安全系统能够有效地避免人身伤害。为此,介绍了一种基于PIC16F873单片机控制的超声波测距系统,详细地阐述了其硬件及软件的设计原理。该系统硬件结构简单、工作可靠、有良好的测试精度和灵敏度,可用于农用车辆防撞智能安全装置。

矿用车辆安全标准化管理与研究

本文叙述了矿用车辆专业安全标准化管理的重要性,总结了作者近年来对矿用车辆专业安全管理存在的弊端,提出了车辆安全管理标准和标准化管理改进措施,提高了矿用车辆综合效率,解决矿用车辆安全管理混乱,无标准及驾驶、装卸、运输、行车等事故频繁发生的难题,确保矿用车辆安全高效运输,并获得了良好的经济效益,将在太钢各矿山推广。

食品安全监测专用车等亮相福州

6月18日，为期3天的第九届中国-海峡项目成果交易会在福州海峡国际会展中心开幕。国家质检总局专门调派中国检验检疫科学研究院研发，曾获国家质检总局“科技兴检奖”一等奖的食品安全监测专用车和安徽出入境检验检疫局的快速口岸卫生处理专用车参展。

A novel refined dynamic model of high-speed maglev train-bridge coupled system for random vibration and running safety assessment

Running safety assessment and tracking irregularity parametric sensitivity analysis of high-speed maglev train-bridge system are of great concern,especially need perfect refinement models in which all properties can be well characterized based on various stochastic excitations.A three-dimensional refined spatial random vibration analysis model of high-speed maglev train-bridge coupled system is established in this paper,in which multi-source uncertainty excitation can be considered simultaneously,and the probability density evolution method(PDEM)is adopted to reveal the system-specific uncertainty dynamic characteristic.The motion equation of the maglev vehicle model is composed of multi-rigid bodies with a total 210-degrees of freedom for each vehicle,and a refined electromagnetic force-air gap model is used to account for the interaction and coupling effect between the moving train and track beam bridges,which are directly established by using finite element method.The model is proven to be applicable by comparing with Monte Carlo simulation.By applying the proposed stochastic framework to the high maglev line,the random dynamic responses of maglev vehicles running on the bridges are studied for running safety and stability assessment.Moreover,the effects of track irregularity wavelength range under different amplitude and running speeds on the coupled system are investigated.The results show that the augmentation of train speed will move backward the sensitive wavelength interval,and track irregularity amplitude influences the response remarkably in the sensitive interval.

踹倒千斤顶要了人的命

一日，福建省武夷山市上梅乡伍某驾驶农用车为周某送货途中，右前钢板断了一片。伍某把车停路边拿出两个千斤顶准备更换钢板。因为千斤项的高度不够，伍某从路边寻来一根木桩垫在千斤顶下，高度还是不够，伍某拿出备用的七片钢板垫上，才把车支起来把钢板换上。

油田公务车辆智能监管系统的建设及应用

随着石油科研人员公务用车需求的提高以及相关管理要求的提升,目前公务车辆管理不仅存在车辆调度不合理、监管不到位的问题,而且在车辆的安全运行方面也亟需升级服务。详细介绍了针对研究院公务车辆智能监管系统的架构设计和技术方案实现,主要采用了多数据库动态调用、Nginx安全访问、GPS导航定位、GIS地图实时展示、公务用车数据统计和分析、气象灾害智能预警、不合理驾驶行为智能监控等技术。通过应用公务车辆智能监管系统,在实现智能监管场景中取得了科学用车、安全用车等显著成效,同时在经营管理方面也达到了降本控投、开源节流的效果。描述该系统的建设和应用,希望为其他类似行业公务车辆的信息化和智能化建设提供参考。

Running safety and seismic optimization of a fault-crossing simply-supported girder bridge for high-speed railways based on a train-track-bridge coupling system

Bridges crossing active faults are more likely to suffer serious damage or even collapse due to the wreck capabilities of near-fault pulses and surface ruptures under earthquakes.Taking a high-speed railway simply-supported girder bridge with eight spans crossing an active strike-slip fault as the research object,a refined coupling dynamic model of the high-speed train-CRTS III slab ballastless track-bridge system was established based on ABAQUS.The rationality of the established model was thoroughly discussed.The horizontal ground motions in a fault rupture zone were simulated and transient dynamic analyses of the high-speed train-track-bridge coupling system under 3-dimensional seismic excitations were subsequently performed.The safe running speed limits of a high-speed train under different earthquake levels(frequent occurrence,design and rare occurrence)were assessed based on wheel-rail dynamic(lateral wheel-rail force,derailment coefficient and wheel-load reduction rate)and rail deformation(rail dislocation,parallel turning angle and turning angle)indicators.Parameter optimization was then investigated in terms of the rail fastener stiffness and isolation layer friction coefficient.Results of the wheel-rail dynamic indicators demonstrate the safe running speed limits for the high-speed train to be approximately 200 km/h and 80 km/h under frequent and design earthquakes,while the train is unable to run safely under rare earthquakes.In addition,the rail deformations under frequent,design and rare earthquakes meet the safe running requirements of the high-speed train for the speeds of 250,100 and 50 km/h,respectively.The speed limits determined for the wheel-rail dynamic indicators are lower due to the complex coupling effect of the train-track-bridge system under track irregularity.The running safety of the train was improved by increasing the fastener stiffness and isolation layer friction coefficient.At the rail fastener lateral stiffness of 60 kN/mm and isolation layer friction coefficients of 0.9 and 0.8,respectively,the safe running speed limits of the high-speed train increased to 250 km/h and 100 km/h under frequent and design earthquakes,respectively.

Collaborative Reversing of Input Formats and Program Data Structures for Security Applications

Reversing the syntactic format of program inputs and data structures in binaries plays a vital role for understanding program behaviors in many security applications.In this paper,we propose a collaborative reversing technique by capturing the mapping relationship between input fields and program data structures.The key insight behind our paper is that program uses corresponding data structures as references to parse and access different input fields,and every field could be identified by reversing its corresponding data structure.In details,we use a finegrained dynamic taint analysis to monitor the propagation of inputs.By identifying base pointers for each input byte,we could reverse data structures and conversely identify fields based on their referencing data structures.We construct several experiments to evaluate the effectiveness.Experiment results show that our approach could effectively reverse precise input formats,and provide unique benefits to two representative security applications,exploit diagnosis and malware analysis.

Anti-slip security assessment between main cable and saddle of the middle pylon under extreme vehicle loads

The traffic condition of Taizhou Yangtze River Bridge is obtained to a certain extent, according to the traffic investigation nearby Taizhou Bridge. The statistical characteristics of the traffic conditions are acquired by statistical analysis. Simulation of the extreme vehicle loads and the sensitive analysis of load parameters are carried out based on these data complemented, which would guide the determination of the frictional coefficient between the main cables and the saddle.

Characteristics of China's Automobile Recall Actions

For the purpose of enhancing automobile safety and the effectiveness of recalls,increasing manufacturers' quality control capabilities,and reducing defects,we investigated thestatus of recalls over the last five years.We have examined patterns and trends in motor vehiclesafety recalls using databases from China,Europe and the United States.A recall rate parameterwas developed to evaluate the level of recall enforcement based on analyzing the reasonsfor recalls and manufactures' characteristics.Moreover,there were substantial differencesin the recall rates of China compared with those in other countries,indicating that Chinese manufacturersneed to take more active action in recall.

干线公路平面交叉口安全设计研究

分析了目前国内公路平面交叉口设计主要存在的问题，提出了平交口安全设计流程，结合国内外规范对交叉口安全设计的内容进行了阐述，提出了相关方法和标准，为公路平面交叉口的设计优化提供了参考。

今年国家将更新四十五万辆汽车

2000年我国汽车更新实施方案已确定，今年将更新汽车45万辆，比1999年增加5万辆。

CONTROL OF VEHICLE PLATOONS FOR HIGHWAY SAFETY AND EFFICIENT UTILITY:CONSENSUS WITH COMMUNICATIONS AND VEHICLE DYNAMICS

Platoon formation of highway vehicles is a critical foundation for autonomous or semiautonomous vehicle control for enhanced safety,improved highway utility,increased fuel economy,and reduced emission toward intelligent transportation systems.Platoon control encounters great challenges from vehicle control,communications,team coordination,and uncertainties.This paper introduces a new method for coordinated control of platoons by using integrated network consensus decisions and vehicle control.To achieve suitable coordination of the team vehicles based on terrain and environmental conditions,the emerging technology of network consensus control is modified to a weighted and constrained consensus-seeking framework.Algorithms are introduced and their convergence properties are established.The methodology employs neighborhood information through on-board sensors and V2 V or V2 I communications,but achieves global coordination of the entire platoon.The ability of the methods in terms of robustness,disturbance rejection,noise attenuation,and cyber-physical interaction is analyzed and demonstrated with simulated case studies.