贺尔海枢纽立交方案比选

对贺尔海枢纽立交的方案比选设计进行了详细的介绍,希望能够为同类立交设计时提供技术借鉴。     

京秦高速公路沥青路面病害养护方法效果评价

在养护工程实践中以最大限度提高道路使用性能为目的，不断应用新技术、新材料、新工艺．为保证全线道路的使用功能和通行能力起到了积极的作用。     

A Constrained Controller Based on State Estimation

IntroductionIn practice, owing to the limitations of actua-tors and other physical properties, the inputs of asystem are often subject to constraints. It has sig-nificant theoretical and engineering values to inves-tigate the control of constrained systems. In thepast years, many attempts have been made on thisissue[1-5]. For a class of uncertain constrained dis-crete-time systems, Kothare, et al[4]proposed anonline receding predictive control algorithm. Byanalyzing the degradation condition …     

Experimental Study of Surface Detection of Gas Pipeline Buried in Soil

IntroductionGas pipelines buried in soil are necessary intransport process of city gas. Whether it is safe ornot is related to the safety of tens of thousands do-mestic customers in life and the industrial cus-tomers in work.Because of the high-speed development of thegas business in Shanghai, the gas users are ex-panded from hundreds of thousands in several mil-lions, and the gas pipeline is also developed fromingot tube into steel pipe. The underground steel-pipelines will bring into all ki…     

基于自适应正交变换线性组合器的EP信号压缩方法

研究了自适应正交变换线性组合器（ＡＯＴＬＣ）的原理，并将其应用于ＥＰ信号的数据压缩之中，分析和计算机模拟的结果表明，在保持同样压缩率的情况下，对ＡＯＴＬＣ压缩数据所恢复的ＥＰ信号进行潜伏期变化估计的性能，优于采用常规的差分脉冲编码调掉（ＤＰＣＭ）方法压缩重建ＥＰ信号并估计潜期变化的性能在保持各自潜伏期估计性能相近的情况下，ＡＯＴＬＣ的压缩率优于ＤＰＣＭ，另一方面，ＡＯＴＬＣ具有削弱随机噪声的能力，     

Robust Spectral Estimation of Track Irregularity

Because the existing spectral estimation methods for railway track irregularity analysis are very sensitive to outliers, a robust spectral estimation method is presented to process track irregularity signals. The proposed robust method is verified using 100 groups of clean/contaminated data reflecting he vertical profile irregularity taken from Bejing-Guangzhou railway with a sampling frequency of 33 data every 10 m, and compared with the Auto Regressive (AR) model. The experimental results show that the proposed robust estimation is resistible to noise and insensitive to outliers, and is superior to the AR model in terms of efficiency,, stability and reliability.     

非参数估计中核估计的构造及相合性

讨论了非参数估计中的核估计方法,对于相互独立同分布的随机变量的密度函数引进了新的估计量方法,并且讨论了此估计的量的逐点相合性,求出了未知密度函数的区间估计,最优窗宽。     

自适应时间延迟估计方法的改进

研究了自适应时延估计方法的性能,提出了收敛因子的自动调节改进算法,改进了收敛速度和误差调整系数之间的矛盾,并进行了计算机模拟以验证方法的有效性。     

土工格网加筋台背填土试验研究

路桥过渡段桥头跳车是高等级公路建设中较难处理的常见问题,往往给高速公路快速、平稳行车带来不利的影响。结合衡枣高速公路桥梁工程实例,介绍了采用土工格网进行桥台台背填土处理的方案,通过现场试验,分析土工格网处理桥头跳车的现场试验方法、数据分析及实际效果,为解决高速公路桥头跳车危害积累经验。     

多采样率EKF及其在感应电机转速估计中的应用

在深入研究EKF算法和多采样率数字控制系统的基础上,建立了多采样率EKF算法,分别推导了其输入和输出算法,并将其应用于感应电机的转速估计中.通过仿真验证了该算法比单采样率扩展Kalm an滤波算法具有更高的信息获取和状态估计能力,并能有效抑止噪声,转速估计误差减小41.7%~87.6%.