基于LIN总线的车载电子钟控制系统设计与研发

针对现有车载电子钟的人机交互体验问题,提出一种基于LIN总线的电子钟控制系统,设计了一种嵌入屏式电子钟封装,实现了电子钟的自动校时与背光显示的功能.新型控制系统的设计,省去了调节键的设计,从而解决了人机交互体验问题.     

利用延迟反馈方法控制调速器系统的混沌

通过对机械式离心调速器系统增加一个延迟反馈控制器,利用它控制系统从混沌运动转化为周期运动.当该控制器的延迟时间等于系统的某一条不稳定轨道的周期时,就能将处于混沌状态的系统控制到相应的不稳定周期轨道上,并将该轨道稳定化.数值仿真表明了该控制方法在机械式离心调速器系统混沌控制中的有效性与可行性,将系统的混沌行为利用适当的控制强度控制到稳定的周期轨道.     

Capacity and QoS based codebook construction for MIMO precoded spatial multiplexing systems with limited feedback

This paper deals with the design and performance analysis of transmit precoder optimization for multiple input multiple output (MIMO) systems with limited feedback of channel state information. A capacity criterion based optimal codebook construction algorithm for MIMO precoded spatial multiplexing systems is pre-sented. The optimal precoder structure combining precoding and power allocation is employed. Simulation results show that the capacity criteria based codebook can achieve higher capacity than that of equally power allocation based codebook of previous research.     

公路超高的灵活性设计分析

超高设计影响因素较多,具有一定的路段差异性.在阐述超高值与行车安全关系的基础上,分析了各超高设计要素及其影响因素,并结合实例说明超高灵活性设计的思路.     

强化喷丸对渗碳齿轮表面接触疲劳裂纹形成与扩展的影响

导致渗碳齿轮接触疲劳裂纹形成与扩展的动力参数是齿轮次表面所受的最大切应力τmax与其表面硬度的比值,减小该比值可延缓齿轮表面接触疲劳裂纹形成与扩展过程,提高齿轮疲劳寿命.分析了强化喷丸工艺对渗碳齿轮次表面所受τmax和表面硬度的影响,通过强力喷丸引入的冷作硬化可使渗碳齿轮表面硬度明显提高;引入的高残余压应力可使渗碳件次表面所受的τmax显著减小.试验表明,齿轮渗碳后再按最佳工艺进行强化喷丸后,可显著提高齿轮表面的疲劳强度.     

速腾轿车亏电故障诊断与排除

针对一辆搭载BWH型发动机的一汽大众速腾2.0 L轿车,只要停放2天左右就会出现蓄电池严重亏电、导致发动机不能起动的故障现象,分析了速腾轿车的全车电路布置,发现故障是由于行李舱灯控制电路的二极管装错引起的.重新更换二极管并将正、负极对调后,故障排除.论述了诊断过程.     

某特大桥基础病害分析与加固措施研究

某特大桥自建成以来,基础开裂严重,且裂缝在不断发展,以至危及到大桥的安全及整条铁路线的运营。在调查统计全桥病害情况、设计图纸及地质资料的情况下,运用大型有限元程序ANSYS对大桥基础进行了空间受力分析,找出了产生病害的原因,并提出了切实可行的加固方案。     

浅析新型支挡结构在铁路运营线中的应用优势

针对铁路运营线的特点,分析新型支挡结构的优势,倡议推广应用新型支挡结构。     

一种混合式直流断路器设计方法

针对一种典型的混合式直流断路器,本文提出了优先进行"零电流换流过程设计",随后进行"零电压换流过程设计"的设计方法。以8 k V/4k A的混合式直流断路器为例,针对预期短路电流160 k A且短路时间常数为7 ms的工况,基于该方法成功实现了短路分断时间不超过1.8 ms且分断峰值电流不超过40 k A的设计指标。该方法对混合式直流断路器的设计具有一定的指导意义。     

Incorporating container location dispersion into evaluating GCR performance at a transhipment terminal

The degree of container dispersion at a transhipment terminal is measured by an index termed container location dispersion, which represents the range, both horizontal and vertical, of all containers for ship loading that are scattered in the yard. First, this paper identifies the impacts of container location dispersion on loading performance with insufficient or sufficient equipment deployment in real-life settings at a terminal. Then, we investigate those scenarios with different levels of interference. This research aims to explore the relationship between the container location dispersion and Gross Crane Rate (GCR) stability at a transhipment terminal and proposes a discrete-event driven simulation model for this purpose. All data in our experiments are extracted from the terminal operation system at a real-life container terminal. It is concluded from a series of experiments that the container location dispersion well captures the overall performance of container terminal handling and can be used for yard template optimization and management. Implications of this investigation are discussed in the context of the yard template design and improvement in the overall performance of a container transhipment terminal.