某履带装甲车辆传动轴动态转矩数据采集及分析

由于现阶段缺少可信度较高的有效数据,对履带装甲车辆传动轴动态转矩数据采集及分析开展了研究。结合履带装甲车辆综合传动系统的技术特性,充分考虑到现有测试装置的特点,确定了关键部件和测点位置,为获得可信度相对较高的数据打下基础。为了能够给动态载荷谱编制提供可信度更高的数据,使用雨流滤波方法对综合传动系统载荷测试数据进行处理与分析后,再综合运用非参数估计、时域数据修正等方法对数据进行进一步的分析处理,得到可信度较高的载荷数据,最后从时域和频域方面对多工况动态转矩信号进行验证,确保了动态转矩测试的准确性,从而为后续的编谱工作提供了可信度高的有效数据。     

An innovative method for the analysis of vehicle movements in roundabouts based on image processing

The objective of this paper is to propose a method, based on the image processing of field survey data, to analyze vehicles movements into roundabouts. This research study consisted of three stages: a field survey to collect vehicular flow images captured by video cameras, the processing of these images using a proprietary software (VeTRA—Vehicle Tracking for Roundabout Analysis), and finally, the analysis of the collected data. The main feature of the software is that it allows the automatic computation of the main variables necessary to rank and evaluate a generic roundabout: the entry/exit (E/E) matrix with classification of vehicles (e.g., heavy, light, and motorbikes), vehicle trajectories, and vehicular speed diagrams along the paths inside the roundabout. The processing system is robust enough to withstand classic problems affecting image processing such as variable wind conditions, cloud cover, shadows, and obstructions. Calibration and error evaluation have been deduced from data collected by a high precision Real Time Kinematic GPS video recording system mounted on a probe vehicle. Data of E/E matrices generated by VeTRA are compared with those manually counted on the corresponding video images. A case study of an existing roundabout is featured in the paper. The results indicate that the software has a high capability of generating the E/E matrix. The analysis of vehicular trajectories with both the plot of curvature diagrams and the corresponding speed diagrams enable the evaluation of driver behavior relative to the geometric shape of the roundabout. Copyright © 2011 John Wiley & Sons, Ltd.     

超深连续墙槽壁侧向变形影响因素分析

结合黄河地质条件,从泥浆重度、泥浆液面高度、地下水、地面荷载及超深导墙等5个方面分析和计算了对连续墙的侧向变形影响,提出了超深连续墙槽壁稳定的工程措施。     

密闭舱段片状聚合物锂离子电池组温度场分析

水下航行器密闭电池舱段中聚合物锂离子电池工作时所产生的热量极难散出,这会导致聚合物锂离子电池组温度升高,进而影响其性能和安全性。本文针对水下航行器密闭舱段对聚合物锂离子电池建立数学模型,利用Ansys软件对电池组、1/2电池组、50及20块电池所组成的电池组进行温度场分析。通过分析结果可知,片状聚合物锂离子电池叠加在一起时,热量主要沿侧面散出,两端面对电池组温度影响较小,在对电池组进行温度场分析时,正负极极耳不能忽略。