一种域控制器片内及片外时间同步的方法

目前整车E/E架构由于面临来自不同控制器和传感器的数据交互需求而变得愈加复杂,所需要解决的问题包括:功能复杂性,通信带宽,计算能力,灵活性,可拓展性等。其中域控制器上层应用算法对获取数据的同步尤其敏感,数据融合需要针对同一时间点获取到的数据做融合处理。因此,对域控制器内部的异构多核、外部控制器数据以及传感器数据时间同步的研究尤其重要。基于此,文章详细介绍了域控制器片内及片外时间同步的方法,解决了域控制器内外部数据时间不同步的技术缺陷。     

半刚性基层沥青路面结构内部应变的现场测试与分析

为了能够获得实际车辆荷载作用下路面结构内部的力学响应,以G112国道工程为依托,结合我国半刚性基层沥青路面的设计经验,设计四种不同的路面结构形式,在沥青层和半刚性基层埋入应变传感器测量设备,通过不同的车辆荷载的作用,实现路面结构内部应变的测量,对半刚性基层沥青路面的结构性能和组合设计具有较大的参考价值.     

A probabilistic optimization model for allocating freeway sensors

This paper proposes a sensor location model to identify a sensor configuration that minimizes overall freeway performance monitoring errors while considering the consequences of probabilistic sensor failures. To date, existing sensor location models for freeway monitoring inherently assume that either deployed sensors never fail or the consequences of sensor failure are trivial matters. However, history has revealed that neither assumption is realistic, suggesting that ignoring failures in sensor allocation models may actually produce a significantly suboptimal configuration in the real world. Our work addresses this dilemma by developing a probabilistic optimization model that will minimize the error expectation by examining all possible failure scenarios, each with an occurrence probability. To ensure the scenario completeness and uniqueness, a sensor failure scenario is represented by using a binary string with 1 indicating an operational sensor at a given site and 0 for sensor failure or no sensor deployed. When applied to a case study network, it is shown that an optimal configuration that considers sensor failure is significantly different from an optimal configuration that ignores sensor failure, revealing that sensor failures pose non-trivial consequences on performance monitoring accuracy.     

一种高效的传感器网络加密方案

提出了一种基于密钥预分配无线传感器网络中的加密方案。方案在加密过程中使用了计数器和消息认证码,从而较好地满足了传感器网络安全需求。同时,考虑到传感器节点资源有限的特点,方案中相关协议和算法都比较简单,并完全避开了代价昂贵的公钥运算,从而使得方案计算、存储和通信开销都比较小,执行效率大大提高。     

霍尔罗经

利用半导体霍尔器件作为传感器直接敏感地球磁场的磁感应强度，研制成固态罗经。本文对霍尔罗经的构成、钢铁船舶对其指向的影响及同纬度自差校正理论和方法，作了较全面的论述。     

光纤光栅传感器在桥梁缺陷检测和结构健康监测中的应用

阐述了桥梁缺陷检测和结构健康监测的背景和意义,介绍了桥梁主要缺陷和结构健康监测内容,并对光纤光栅传感器的结构、工作原理、应用特点及其在国内外实际工程中的应用进行了概述,最后给出了光纤光栅传感器在桥梁缺陷检测和结构健康监测中的应用。     

传感器多功能试验台的研制

本文介绍了传感器多功能试验台的研制技术、功能和特点，对船舶传感器的试验具有重大意义。     

水泥混凝土摊铺机横坡找平传感器

自动找平技术是滑模式水泥混凝土摊铺机的关键技术,而自动找平传感器是自动找平系统最重要的部件,它的性能直接影响到摊铺机的整机性能及铺筑路面的质量。本文在分析研究摆式横坡传感器的基础上,提出了一种新型的比例脉宽调制式电传感器方案。     

Density/Flow reconstruction via heterogeneous sources and Optimal Sensor Placement in road networks

This paper addresses the two problems of flow and density reconstruction in Road Transportation Networks with heterogeneous information sources and cost effective sensor placement. Following a standard modeling approach, the network is partitioned in cells, whose vehicle densities change dynamically in time according to first order conservation laws. The first problem is to estimate flow and the density of vehicles using as sources of information standard fixed sensors, precise but expensive, and Floating Car Data, less precise due to low penetration rates, but already available on most of main roads. A data fusion algorithm is proposed to merge the two sources of information to estimate the network state. The second problem is to place sensors by trading off between cost and performance. A relaxation of the problem, based on the concept of Virtual Variances, is proposed and solved using convex optimization tools. The efficiency of the designed strategies is shown on a regular grid and in the real world scenario of Rocade Sud in Grenoble, France, a ring road 10.5 km long.     

摩托车凸轮轴淬火开裂问题探讨

通过对摩托车发动机凸轮轴质量问题分类统计结果分析,找出了造成凸轮轴裂纹的3个主要原因,通过采取相应措施,使凸轮轴的废品率由原来的4．9％降至2％。