浅谈顶盖横梁拼焊工艺优化及其模块化定位的工作方法

本文通过对产销量大的低配车型顶盖合拼的工艺优化,对前横梁、中横梁和后横梁的上件工艺方案及其定位夹具优化,开发新一代中横梁、后横梁的定位夹具,将中横梁、前横梁等零件的定位方法模块化,形成一种整体解决方案,具有较高的应用推广价值。     

Rollover detection and control on the non-driven axles of trucks based on pulsed braking excitation

The major challenges for rollover detection are the accurate modelling of vehicle dynamics and the real-time estimation of the varied parameters. To circumvent the dependence on vehicle parameters, a novel rollover detection method based on the pulsed braking excitation is proposed. With the lateral load transfer ratio (LTR), the relationship between rollover risks and non-driven wheel rotational dynamics is deduced, which is the basis to apply braking excitation on wheels. The lateral acceleration is adopted as the first criterion to activate the rollover detection. Once the pulsed braking is applied to the non-driven wheels, the braking pressure and wheel angular speeds are measured to estimate the LTR on the non-driven axle. In case of emergency, the differential braking-based anti-rollover is implemented. Experiments were conducted on a Hardware-in-Loop bench. The results show that, the pulsed braking can be activated timely, and the LTR on the non-driven axle is estimated accurately. With the anti-rollover control, the roll stability is improved considerably.     

起动用免维护铅酸蓄电池使用与保养维护

介绍了起动用铅酸蓄电池的养护一般要求,分析影响蓄电池亏电的因素,并介绍了两种不同的蓄电池补电方法及注意事项.为蓄电池的使用及保养维护提供理论和现实依据.     

浅埋暗挖隧道全断面帷幕注浆技术简析

该文以广东省莞惠城际轨道松山湖隧道DK32+240～DK32+465段隧道全断面帷幕注浆施工为例,重点介绍该隧道注浆施工的一些关键环节和安全质量控制要点。     

A probability approach to anomaly detection with twin support vector machines

AbstractClassification of intrusion attacks and normal network flow is a critical and challenging issue in network security study. Many intelligent intrusion detection models are proposed, but their performances and efficiencies are not satisfied to real computer networks. This paper presents a novel effective intrusion detection system based on statistic reference model and twin support vector machines (TWSVMs). Moreover, a network flow feature selection procedure has been studied and implemented with TWSVMs. The performances of proposed system are evaluated through using the fifth international conference on knowledge discovery and data mining in 1999 (KDD’99) data set collected at MIT’s Lincoln Labs and the results indicate that the proposed system is more efficient and effective than conventional support vector machines (SVMs) and TWSVMs.     

集中制浆分散净化技术在苏通大桥主塔墩钻孔施工中的应用

结合苏通大桥主塔墩钻孔施工,介绍集中制浆分散净化技术在大规模深水群桩基础施工中的应用,主要介绍了泥浆的配制、泥浆的循环、泥浆的净化和泥浆的回收过程。     

深圳地铁5号线长岭陂隧道竖井施工技术

针对深圳地铁5号线5304标长岭陂隧道DK19＋677施工竖井深、大特点,详细的介绍本竖井不同地质岩层段的施工方法,为地铁类似工程施工与设计提供借鉴。     

有机锂皂石的膨胀性能影响规律的研究

从锂皂石原矿中提纯出精矿,经不同浓度的稀盐酸处理得到层电荷数逐渐降低的锂皂石样品,然后对其进行钠化,再与十六烷基三甲基溴化铵(CTAB)反应从而制得有机锂皂石.有机锂皂石在硝基苯中的黏度和红外光谱分析表明当盐酸浓度为0.2 moL· L-1时,锂皂石的层状结构几乎保持不变,此时层电荷数降低到了黏度最大的临界点.有机化最...     

浅谈1000t货驳改建自航简易货轮的实践

湖北省蕲春县航运公司在当前水运市场不景气、老旧船舶多、设备老化的情况下,结合自身的实际,以现行船舶"建造规范"、"营运检验规程"为依据,将原1000t货驳成功地改建为1000t级自航简易货轮.