基于数字图像的车辆行驶跑偏在线测量方法     

陈长军  王刚  刘勇  何耀华 《测绘科学》2014,39(9)

保证车辆在正常情况下沿直线行驶是汽车制造的基本要求,汽车制造厂商高度重视车辆行驶跑偏的检测.文章分析了车辆行驶跑偏量测量的一般方法并提出了一种基于数字图像的汽车行驶跑偏检测方法,实现了车辆行驶跑偏量的自动测量.通过实验,验证了该方法的可行性,且具有自动化程度高、效率高、测量精度高以及可靠性强等特点.基于数字图像的车辆行驶跑偏在线测量系统已投入汽车制造公司的实际生产使用.  相似文献   

Effect of Scour on the Behavior of Laterally Loaded Single Piles in Marine Clay     

Fen Li  Jie Han  Cheng Lin 《Marine Georesources & Geotechnology》2013,31(3):271-289

Most offshore and coastal structures are supported by pile foundations, which are subjected to large lateral loads due to wind, wave, and water currents. Water currents can induce scouring around piles that reduces lateral capacity and increases lateral deflection of a pile. Current design methods mostly consider the complete removal of soil layers around piles by scouring. In reality, however, scouring creates scour holes at different shapes, sizes, and depths. Their effects on the behavior of laterally loaded piles are not well investigated. A numerical model of a single pile in soft marine clay was first calibrated against field test data without scour. Then several key factors of scour were analyzed, such as the depth, width, and slope of the scour hole and the diameter and head fixity of the pile. The relationships of the ultimate lateral capacity of the single pile with the depth, width, and slope angle of the scour hole were obtained. The numerical results show that the scour depth had more significant influence on the pile lateral capacity than the scour width. In addition, the pile with a free head was more sensitive to scour than the pile with a fixed head.  相似文献   

Flow Deflection in Intersected Tubes     

Tian Kaiming Wan Li Department of Water Resources  Environmental Science  China University of Geosciences  Beijing 《中国地质大学学报(英文版)》2000,11(4)

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｔｈｅｏｒｅｔｉｃａｌｃａｌｃｕｌａｔｉｏｎｓｏｆｗａｔｅｒｍｉｇｒａｔｉｏｎ ,ｗｈｅｔｈｅｒｉｎａｎｉｎｄｉｖｉｄｕａｌｆｒａｃｔｕｒｅｏｒｉｎａｆｉｓｓｕｒｅｎｅｔｗｏｒｋ ,ｈａｖｅａｌｌｂｅｅｎｂａｓｅｄｏｎｔｈｅｅｑｕａｔｉｏｎｆｏｒｖｉｓｃｏｕｓｆｌｏｗｂｅｔｗｅｅｎｐａｒａｌｌｅｌｐｌａｔｅｓ.ＷｉｌｓｏｎａｎｄＷｉｔｈｅｒ ｓｐｏｏｎ (1976 )ｆｉｒｓｔａｃｃｏｍｐｌｉｓｈｅｄａｈｙｄｒａｕｌｉｃｓｉｍｕｌａｔｉｏｎｏｆｆｒａｃｔｕｒｅｗａｔｅｒｃｒｏｓｓ…  相似文献   

RESEARCH ON THE MOTION PATTERN OF SLIP-STRIKE FAULT BY USING DEFLECTION ANGLES——A CASE STUDY OF THE NANTINGHE FAULT          下载免费PDF全文

SHI Feng  HE Hong-lin  Alexander L Densmore  WEI Zhan-yu  SUN Hao-yue 《地震地质》2018,40(4):773-783

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圆曲线与综合曲线的放样方法     

史磊 《测绘与空间地理信息》2010,33(1):215-217

通过对工程测量中曲线测设的各种方法总结,论述了曲线放样的数学原理及程序编制方法。分别介绍了圆曲线、综合曲线放样方法的过程。探讨了一种放样缓和曲线及其边线的方法,此法在实际工作中有良好的效果,满足了公路、铁路、桥梁等工程测量设计工作对数据准确可靠的需要。无论是工程进程各阶段的测量工作,还是不同工程的测量工作,都需要根据误差分析和测量平差理论选择适当的测量手段,并对测量成果进行处理和分析,也就是说,测量数据处理是工程测量的必不可少的重要内容。  相似文献   

横向磁场中大挠度金属薄板的混沌振动          下载免费PDF全文

薛春霞  张善元  树学锋 《海洋学报》2010,32(9):6599-6605

利用Karman关于板的大挠度理论,考虑涡电流在板中引起的Lorentz力,导出了在横向磁场和横向载荷共同作用下薄板的非线性运动方程.借助Bubnov-Galerkin法将非线性偏微分方程转化为含三次非线性项的常微分方程.在定性分析的基础上,利用次谐轨道的Melnikov函数给出了发生Smale马蹄型混沌运动的阈值条件,进而数值计算了系统的分岔图、相应的相图、Poincaré映射和时程曲线,给出了混沌运动的数字特征.分析结果表明:磁感应强度和外载荷都会影响系统的振动特性.  相似文献