西南某岩溶山区大面积挖方工程确定土石比方法研究

在分析、总结西南岩溶地区挖方工程土石比确定方法的基础上,结合西南某岩溶山区大面积挖方工程,系统地研究了岩溶山区土石比的确定、计算方法以及精度的影响因素,提出了岩溶山区大面积挖方工程确定土石比的方法和工作程序。工程实践证明,按此方法和程序,获得的土石比精度高,可推广使用。     

Reliability Prediction Method Based on State Space Model for Rolling Element Bearing

Reliability analysis based on equipment’s performance degradation characteristics is one of the significant research areas in reliability research. Nowadays, many researches are carried on multi-sample analysis. But it is limited for a single equipment reliability prediction. Therefore, the method of reliability prediction based on state space model(SSM) is proposed in this research. Feature energy of the monitored signals is extracted with the wavelet packet analysis and the associated frequency band energy with online monitored data. Then,degradation feature is improved by moving average filtering processing taken as input pair model parameter of SSM to be estimated. In the end, state space predicting model of degradation index is established. The probability density distribution of the degradation index is predicted, and the degree of reliability is calculated. A real testing example of bearing is used to demonstrate the rationality and effectiveness of this method. It is a useful method for single sample reliability prediction.     

舰船遥感图像检测小波分析研究

本文以舰船遥感图像为具体分析对象,针对舰船图像中存在的噪声干扰和目标边缘检测问题,引入小波分析作为解决方法,通过对使用小波进行图像去噪及目标边缘检测原理的分析,采用db N小波函数为对舰船图像信号进行分解,以自适应阈值法实现高频信号去噪处理,并对降噪后的图像选择合适的平滑函数进行舰船目标边缘提取,结果表明,小波分析能够很好地实现舰船遥感图像去噪,而舰船目标对于边缘提取,虽然效果较好,但仍有进一步优化改进的空间。     

KZ70型石碴漏斗车操纵室结构的设计

介绍了KZ70型石碴漏斗车操纵室的结构特点,并且与以往的石碴漏斗车操纵室进行了比较。     

动车组滤网(筒)清洗机

介绍了动车组滤网(筒)清洗机的工作原理、工作流程及产品特点。     

Driving segment simulation for determination of the most effective driving features for HEV intelligent control

This paper presents a methodological approach for determination of the most effective driving features for hybrid electric vehicle intelligent control, using the driving segment simulation. In this approach, driving data gathering is first performed in real traffic conditions using Advanced Vehicle Locator systems. The vehicle's speed time series are then divided into small segments. Subsequently, 19 driving features are defined for each driving segment, and the influence of the driving features on the vehicle's fuel consumption (FC) and exhaust emissions is investigated, using driving the driving segment simulation. The simulation approach is also verified by experimental test. Finally, the driving features are ranked by a new approach based on the definition of an effectiveness index and a correlation analysis. The results demonstrate that the velocity-dependent driving features such as ‘energy’, ‘mean of velocity’, ‘displacement’ and ‘maximum velocity’ are more effective on vehicle's FC and exhaust emissions. However, because of high dependency between these features, this study suggests independent driving features among the most effective driving features.     

C3I系统中基于颜色特征的战场图像快速检索

针对C^3I系统中战场目标图像的检索问题，给出一种基于颜色特征内容的检索方法。对于战场图像采用FISI颜色模型，计算H分量的颜色直方图，通过直方图匹配，计算直方图的相似距离，进而检索出相似图像。通过一个简单的基于颜色特征的战场图像检索原型表明上述方法切实有效。     

基于神经网络/模糊逻辑系统的混合式特征提取器

特征提取是水声目标分类的关键环节之一，用以获取各类目标的一些可鉴别性特征。螺旋桨轴频、叶率和叶片数是目标的本质性、鉴别性特征，是分类的重要线索。本文提出了一个基于神经网络／模糊逻辑系统的混合式特征提取器，先利用侧抑制神经网络从目标辐射噪声的包络谱中提取线谱序列，再利用模糊逻辑系统从线谱序列中提取出螺旋桨轴频、叶率和叶片数。对目标数据的分析表明：该特征提取器能够为目标分类提取有效的鉴别性特征。     

一种特征库可更新的相关反馈图像检索方法

相关反馈方法是对基于内容图像检索系统的有效改进,它将人类视觉特性逐步引入检索过程,有效地减小了图像低层特征表示与图像语义理解之间的差异。但传统的相关反馈算法存在反馈次数多,且无法积累用户反馈信息等缺点。本文针对这些缺点,在相关反馈图像检索系统中引入了可更新特征库。即在原始特征索引库的基础之上引入了一个用户可修改的特征索引库,系统可以将用户多次反馈的信息逐步嵌入到这个特征索引库中。与此同时,我们提出了一种基于多分辨率分析的彩色图像纹理特征描述方法,并将其用于特征库的构建中。我们在一个含有10000幅图像的图像库上所做的测试结果表明:与Illinois大学的MARS系统相比[1],本系统可明显提高系统检索准确率和相关反馈的收敛速度。     

修形圆柱滚子轴承滚子凸度量设计

用有限元方法对圆柱滚子轴承的修形滚子的凸度量进行了研究，分析了凸度量对接触应力和等效应力的影响，结果表明，修形滚子降低边界应力集中的效果不但与凸度量有关，而且还与轴承所受载荷大小有关，因此，设计凸度量时必须考虑轴承的实际载荷工况．