多工况下桥梁承台钢板桩围堰分析

为了保证桥梁承台钢板桩围堰的安全性,根据钢板桩的实际受力情况,采用ANSYS软件对钢板桩和围囹进行建模计算分析。根据施工阶段,选取5种工况进行加载计算,对最不利工况引起的强度和变形进行分析,并对钢板桩的入土深度进行了验算。     

NEDC工况下的某车型传动系内阻优化方案浅析

根据汽车理论与变速箱理论原理,浅析整车传动系统效率研究对象,确定传动系阻力损失主要来源于变速箱、驱动轴、轮毂轴承和制动器四个方面,详细分析了这四个方面的阻力产生机理,基于某款成熟车型,针对其变速箱阻力损失、驱动轴阻力损失、轮毂轴承阻力损失以及制动拖滞力损失提出合理的优化方案,将该车型优化前后的NEDC工况下的百公里油耗进行对比验证,最终传动系内阻优化方案可实现NEDC工况下节油2.06%的效果。     

Research on the performance of passive heave compensator for tethered remotely operated vehicle system

A passive heave compensator is designed to enhance the operation safety of a 4.5 km remotely operated vehicle (ROV). This paper proposes a novel idea of designing a compensator with relatively low natural period to optimize gas volume and while adding a special device to remove the problem of ineffectiveness and resonance in long seas. Numerical simulations are done based on serious dynamic model of the whole system, including the compensator, the umbilical tether and the vehicle, solved by the fourth-order Runge-Kutta scheme. The compensator provides great attenuation of motion and tension in most sea states. As the working depth increases, the system natural period decreases, resulting in the occurrence of risk of resonance. By regulating the system damping, the compensator can be effective in these situations.     

一种适用于时域测量的宽带天线研究与设计

时域宽带天线一般用于收发电磁脉冲信号。通过对表征宽带天线时域特性的基本参数的分析和微波脉冲时域测试天线电性能研究,设计一种基于共面波导馈电原理的超宽带小型化环状天线,并利用仿真和试验进行了验证和测试。     

NEDC工况下车辆百公里油耗计算分析

文章以NEDC工况下车辆百公里油耗的计算方法做为研究对象,用最小二乘法和回归分析法做为理论基础,结合具体车型,在计算机程序的帮助下,计算得出综合循环百公里油耗量。通过与法规标准对比,识别出该车型油耗达标存在风险。此方法为车辆NEDC油耗预估与油耗管控提供依据。