连续梁施工过程中考虑温度影响的线形控制

该文介绍了大跨径连续箱梁施工过程中考虑温度影响的线形控制方法。文中给出了采用“固定时间观测法”和“相对标高放样法”进行线形控制的计算公式,在广州市绕城高速公路西二环巴江河大桥悬臂施工中采用“相对标高放样法”控制大线形．理论计算值和实测值基本吻合。     

钻孔灌注桩摩阻力的探讨

应用混合桩理论解释了钻孔灌注桩的极限摩阻力试验值与勘察值之间的差值,总结了极限荷载作用下桩的临界破坏面在桩周土中的分布规律,分析了孔隙比是影响钻孔灌注桩表面粗糙度的重要因素。     

Effects of Residual Ash on Dpf Capture and Regeneration

To study the effects of residual ash on the capture and regeneration of a diesel particulate filter (DPF), repeated capture and complete regeneration experiments were conducted. An engine exhaust particulate sizer was used to measure the particle size distribution of diesel in the front and back of DPF. Discrepancies in the size distribution of the particulate matter in repeated trapping tests were analyzed. To achieve complete DPF regeneration, a DPF regeneration system using nonthermal plasma technology was established. The regeneration carbon removal mass and peak temperatures of DPF internal measuring points were monitored to evaluate the effect of regeneration. The mechanism explaining the influence of residual ash on DPF capture and regeneration was thoroughly investigated. Results indicate that the DPF trapping efficiencies of the nuclear-mode particles and ultrafine particles have significant improvements with the increase quantity of residual ash, from 90 % and 96.01 % to 94.17 % and 97.27 %, respectively. The exhaust backpressure of the DPF rises from 9.41 kPa to 11.24 kPa. Heat transfer in the DPF is improved with ash, and the peak temperatures of the measuring points accordingly increase. By comparing the regeneration trials, the elapsed time for complete regeneration and time difference for reaching the peak temperature between adjacent reaction interfaces are extended with increased quantity of ash. The carbon removal mass rises by 34.00 %.     

基于模糊神经网络的智能车辆循迹控制

为提高智能车辆自主循迹控制的精度,提出了一种基于模糊神经网络控制( FNNC)和神经网络预测( NNP)的智能循迹控制策略。转向控制器的输入量有3个：预瞄点处的横向循迹误差、汽车横摆角速度和侧向加速度。车速控制器的输入量有4个：预瞄点处的面积误差、侧向加速度、汽车侧偏角和转向盘转角。网络训练采用误差反向传播法。仿真与试验结果表明,所设计的循迹控制器通过对驾驶员操作样本的训练,能实现对车辆的车速与转向控制,横向循迹误差和目标车速均比较理想。     

基于Isight和AMESim的液压减振器关键参数集成优化

在AMESim中搭建了某乘用车前悬架双筒充气式液压减振器的仿真模型。以 Isight 为平台集成AMESim,对减振器模型参数进行DOE分析,提取对减振器性能影响较大的参数,作为优化的设计变量。利用Isight中的Pointer智能求解器进行优化。结果表明,经过集成优化后的减振器阻尼力曲线与目标曲线吻合较好,符合工程实际的需要。与传统方法相比,该方法缩短了时间,提高了设计效率,可用于指导减振器阀系参数的设计与性能预测。     

浅谈沥青路面低温裂缝问题

本文介绍了沥青路面低温裂缝的影响因素、低温缩裂机理、种类及减少裂缝的措施.     

影响高职院校思想政治理论课教学因素探析

高职院校思想政治理论课教学相较于普通本科院校,面临的压力更大,问题更多,挑战更强,其原因,既有高职院校思想认识的偏颇,又有现代信息网络化的负面干扰,更有高职院校自身结构性矛盾和培养目标定位之迷茫,如何保障高职院校思想政治理论课教学的有效开展,需要在端正认识,正本清源的基础上,采取有针对性的措施多管齐下,实行“综合治理”。     

高应力软岩巷道基角深孔爆破卸压的试验研究

分析了高应力软岩巷道基角爆破卸压的原理及参数确定方法,并在峰峰集团万年矿进行了现场试验。对比试验表明,高应力软岩巷道基角卸压在巷道掘进初期对围岩变形速度、变形量及稳定时间具有很好的控制作用。深部爆破卸压及浅部加强支护可以充分改变围岩应力状态。     

基于文件交换的设计功能验证

随着ASIC设计规模的不断增大，验证在整个设计中占的比重越来越大。提出了一种基于文件交换的RTL设计功能验证方法。用该方法结合MATLAB对TDSCDMA终端联合检测协处理器进行功能验证，结果表明，该方法特别适合于对数字信号处理ASIC进行黑盒验证。