一种基于预测的电控汽油机怠速稳定性控制方法

根据发动机怠速工作过程的非线性、时变性和不确定性,分析了传统怠速稳定性控制的控制机理及存在的不足,提出了一种基于预测的发动机怠速稳定性控制方法——动态矩阵预测控制(DMC)算法,并建立了预测控制模型。试验表明,该预测控制方法能够较好地克服各种不确定性因素和复杂变化对怠速稳定性的影响。     

基于MPC555高性能32位单片机的混合动力汽车工况控制研究

介绍了基于NPC555的混合动力汽车动力总成控制系统的组成,阐述了其底层驱动模块、状态转换判断模块、电机驱动模块、内燃机单独驱动模块、内燃机与电机联和驱动模块、串联驱动模块、制动能量回收模块等的功能。试验表明,该控制系统可以实现混合动力汽车运行工况控制。     

催化控制技术在二冲程通用小型汽油机上的应用

二冲程通用小型汽油机在非道路机械应用广泛,但排放不能满足EPA和欧盟标准,制约着发展。在解决二冲程通用小型汽油机排放的技术方案中,催化转化技术是目前的主流技术。     

现代工程机械自动换档控制系统（1）

介绍了现代工程机械自动换档系统的原理与方法。结合国外工程机械自动换档实例，详述了有关结构、传感器技术、电液联合控制技术，为现代工程机械设计、使用、维修提供了较详实的资料和依据。     

地铁暗挖隧道二次衬砌施工质量控制浅析

文章根据深圳轨道交通二期工程安托山站—侨香站暗挖区间的二次衬砌施工经验,分析了地铁暗挖隧道二次衬砌施工质量的影响因素以及二次衬砌施工过程中容易发生的质量问题,并提出了具体的控制措施。通过经验总结,使地铁施工的管理、质量控制、施工通病防治上升一个台阶。     

Timetable-based operation in urban transport: Run-time optimisation and improvements in the operating process

Urban public transit provides an efficient means of mobility and helps support social development and environmental preservation. To avoid loss of ridership, transit authorities have focussed on improving the punctuality of routes that operate using timetables. This paper presents a new approach to generating run-time values that is based on analytical development and micro simulations. The work utilizes previous research (described herein) and the experience acquired by Transports Metropolitans de Barcelona (TMB) in operating bus routes based on timetables. Using a sample of historical data, the method used for generating run-time values consists of the following steps: purging and screening atypical trips, based on the consideration of confidence intervals for median trips; segmenting the day into time bands based on the introduction of a new hierarchical classification algorithm; creating initial run-time values based on criteria derived from statistical analysis; adjusting and validating initial run-time values using micro simulations; and evaluating incident-recovery times at the end of trips in order to guarantee the punctual departure of the next trip in the vehicle schedule. To favour service improvement, we also introduced certain indicators that can identify the root causes of non-compliance. As a final step, in order to ensure the applicability and use of the model, we promoted the development of our model within the framework of the HASTUS™ software solution.     

浅谈高速公路路面施工安全管理方法

文章通过分析当前高速公路路面施工安全状况,划分高速公路路面施工危险区域,找出存在的危险控制点,确定项目重大危险源。同时针对项目施工主要危险区域及危险控制点,提出了高速公路路面现场施工安全管理方法。     

Analysis on the Effects of Overloading on the Mechanical Properties of Tunnel Structures in the Silty Ground --A Case Study of Sutong River-crossing GIL Utility Tunnel北大核心CSCD

Based on the Sutong GIL utility tunnel project, which is constructed by the shield machine under the river, and as for the overloading problem at the river bank slope during operating period, the refined threedimensional finite element model was established to study the deformation and cracking characteristics of the tunnel segment structure under different forms of overloading. The evolution laws of section convergence, joint opening and structural stress were analyzed, and the structure damage mechanisms were revealed under conditions of large area loading and local loading. The surface-surcharge control standard was proposed. For the big diameter shield tunneling crossing the silty clay, the research results show that: (1) the deformation failure process is divided into three stages under large area loading condition, taking the design load and compressive yield of rebars inside haunch as the critical points respectively. The first stage is characterized by the elastic stress, the second stage is in plastic state with fracture, and the third stage is accelerating deformation and instability stage. The vertical convergence is 110.5 mm with no opening of joints when rebars are yielded; (2)the deformation failure process under local loading condition is also divided into elasticity, plasticity and instability stages, taking the design load and tensile yield of rebars outside haunch as the critical points respectively. The vertical convergence is 152.6 mm with joint opening of 4.36 mm; (3) the early-warning values of additional stress on the ground under conditions of large area loading and local loading are 110 kPa and 70 kPa respectively. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

涂层与阴极保护下的管道外腐蚀研究与控制

长期以来 ,一直认为管道在涂层和阴极保护协同保护下不会产生外壁腐蚀或腐蚀轻微。应用第三代高精度智能清管检测器对榕山—佛荫长为 2 5 4km的管线进行检测 ,发现了 455处外壁腐蚀 ,研究结果表明 :管道建设时 ,涂层施工的质量较差 ;使用维护过程中涂层材料老化严重、失修 ;管线上阴极保护系统长期故障使管道欠保护 ;执行了有严重缺陷的行业标准 ,至今不知管线上监测到的保护电位距真实的极化电位的差距有多大 ;管线的阴极保护度数据难以采集到。针对上述问题提出了控制腐蚀的方法。     

浅埋偏压段隧道洞口地表沉降变形控制分析

文章对岜肯隧道浅埋偏压段洞口施工中出现的塌方及初衬开裂情况进行客观分析,结合施工实际提出了地表加固及平衡土体偏压措施,有效地控制了地表变形及隧道沉降开裂,保证了隧道施工安全、顺利进行。