管带式车用散热器快速设计

针对汽车发动机散热器种类繁多、设计复杂的问题,通过Solidworks二次开发技术、数据库查询技术、计算机仿真技术等建立发动机散热器快速设计系统,并对散热器的工作状态进行分析,探索出一种散热器快速设计的新方法。     

模范效应助推公交创先争优

为市民群众创造安全、便捷、舒适、和谐的出行环境,是公交行业一切工作的出发点和落脚点,也是公交创先争优活动的主题和根本任务.蚌埠公交集团立足企业实际,将创先争优活动与全市开展的"微笑伴你同行,温馨洒满车厢,创市民满意公交"活动有机结合,以深入推行苗苗服务规范,弘扬苗苗精神,打造行业服务品牌为载体,营造创先争优氛围,引起轰动性品牌效应.     

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针对民航机场及周边空域安全管理的需求和雷达监视存在盲区易受干扰的缺点,设计了一种基于FPGA的实时空中目标跟踪系统. 针对空中目标的特点,采用灰度图像的帧间差分法进行目标检测,自适应双阈值进行目标分割,形心跟踪法进行目标跟踪,达到25帧/s的实时处理速度;算法通过设置跟踪区域和目标锁定点,排除了干扰的影响,提高了系统跟踪能力;采用形心坐标的脱靶量作为云台调整参数,依据分割目标像素大小在跟踪过程中进行了自动变焦控制;采用IDE接口硬盘作为存储介质,FAT32文件系统作为图像存储形式来记录实时图像. 外场实验表明,系统工作稳定,跟踪算法简单实用,可辅助雷达系统对飞机起降及机场空域移动目标进行跟踪监视.     

A study on dynamic response of cable-seabed interaction

A numerical method is developed to investigate the dynamic response of cable-seabed interaction in this paper. The motion of cable is described by the Lumped Parameter Method, while the seabed, unlike the prevailing simplified model of elastic foundation, is modeled as an irregular continuous rigid surface with rebound and friction existing, and the forces exerted by the seabed consist of normal counterforce and isotropic tangential Coulomb friction resistance. To describe the detailed dynamic response, two coefficients are introduced by analogy with the theory of rigid body collision with friction. The cable-seabed kinematic and dynamic contact conditions are formulated subsequently, and are used to incorporate the seabed effect into the cable dynamics to produce a set of ordinary differential governing equations. In this paper, we employ 4th order Runge-Kutta method to solve these equations. Several simulation cases are presented to illustrate the seabed effect. The results show that friction and impact have a prominent influence on the statics and dynamics of the cable.     

Regularization method and immune genetic algorithm for inverse problems of ship maneuvering

Ship maneuverability, in the field of ship engineering, is often predicted by maneuvering motion group MMG) mathematical model. Then it is necessary to determine hydrodynamic coefficients and interaction force coefficients of the model. Based on the data of free running model test, the problem for obtaining these coefficients is called inverse one. For the inverse problem, ill-oposedness is inherent, nonlinearity and great computation happen,and the computation is also insensitive, unstable and time-consuming. In the paper, a regnlarization method is introduced to solve ill-posed problem and genetic algorithm is used for nonlinear motion of ship maneuvering. In addition, the immunity is applied to solve the prematurity, to promote the global searching ability and to increase the converging speed. The combination of regnlarization method and immune genetic algorithm(RIGA) applied in MMG mathematical model, showed rapid converging speed and good stability.     

A study of maneuvering control for an air cushion vehicle based on back propagation neural network

A back propagation (BP) neural network mathematical model was established to investigate the maneuvering control of an air cushion vehicle (ACV). The calculation was based on four-freedom-degree model experiments of hydrodynamics and aerodynamics. It is necessary for the ACV to control the velocity and the yaw rate as well as the velocity angle at the same time. The yaw rate and the velocity angle must be controlled correspondingly because of the whipping, which is a special characteristic for the ACV. The calculation results show that it is an efficient way for the ACV's maneuvering control by using a BP neural network to adjust PID parameters online.     

隧道横向连接通道设置

在许多长大公路隧道和铁路隧道中,两管隧道之间多等间距设置横向连接通道,使隧道在发生火灾等事故情况时,乘行人员可以通过横向连接通道安全地疏散到另一管隧道内,救援人员亦可通过连接通道迅速进入事故现场。     

无人快速综合道路检测车系统设计

路检车是一种专用的道路检测车辆,将无人驾驶技术与道路检测技术相结合,能解决未来智慧高速上无人道路检测的难题。在对道路特征进行数据采集的过程中,需要依靠路段定位、线激光扫描路面、图像采集等技术手段,而无人驾驶车辆在自主行驶的过程中,需要依靠自身的雷达、摄像头、全球定位系统定位装置完成自主避障循迹,在车载设备方面有许多相同之处,论文设计无人快速综合道路检测车,通过融合最新的无人驾驶技术与先进的道路检测技术,实现快速无人化作业,依靠全球定位系统定位更加准确地采集道路信息,完成路面三维重建并分析路面病害的状况,是无人驾驶技术在道路检测领域的应用,为传统的路检技术带来了创新。     

电动汽车驱动系统的智能控制技术及其发展趋势

聚焦研究电动汽车驱动系统的智能控制技术与应用,在电动汽车驱动系统的基础上探讨智能控制与电动汽车技术的融合,旨在为驾驶者、乘车者提供更舒适、安全、便捷、省电的乘车体验,进一步推动电动汽车产业的可持续发展。     

岑兴高速公路跨越成品油管道桥涵设计方法

文章结合岑溪-兴业高速公路设计实践,系统介绍跨越成品油管道桥涵的设计流程及设计方法,为类似桥涵工程设计提供参考。