耙吸式挖泥船是航道疏浚业的生力军

陈述了控泥船在疏浚中的重要作用。分别分析了抓斗式控泥船和绞吸式控泥船的利弊。介绍了目前最先进的耙吸式控泥船。在分析了目前丹东港的地位和现状后指出,丹东港需配备1500m3的耙吸船。     

Dynamic Analysis of Micro-machined Diamagnetic Stable Permanent Magnet Levitation System

A novel micro-machined diamagnetic stable levitation system (MDSLS) which is composed of a free permanent magnetic rotor, a ring lifting permanent magnet and two diamagnetic stabilizers was presented. The static and dynamic stable characters of MDSLS were analyzed. The coupled non-linear differential equations were used to describe six-degree-of-freedom motion of the levitated rotor, and the equivalent surface current and combined diamagnetic image current method were utilized to model the interaction forces and torques between the lifting permanent magnet and rotor permanent magnet and also between the rotor permanent magnet and diamagnetic substrates. Because of difficulty to get analytical solution, the numerical calculation based on Runge-Kutta method was used to solve the dynamic model. The vibration frequencies were identified by fast Fourier transform (FFT) analysis. According to their resonance characteristics and parameters, the translational and angular dynamic stiffness were also calculated. The results show that the levitation of the rotor in MDSLS is stable, and the MDSLS is potential for the application in levitation inertial sensor.     

黑龙江省军区黑河军分区开展冬季执勤装备适应性训练

为适应边防队冬季执勤保障需要,提高单装备操作手的综合素质,近期黑龙江省军区黑河军分区组织一线连队驾驶员进行冬季适应性训练,通过冬季训练提高了素质,强化了责任意识,增强了边防部队冬季执勤的保障能力。     

汽车空气悬架系统综述

文章阐述了汽车空气悬架的结构类型和工作原理,汽车空气悬架的特性（可变刚度、低固有频率、准等频特性）,汽车空气悬架的优缺点以及汽车空气悬架的发展趋势．     

掺烧生物柴油耦合EGR对柴油机性能的影响及优化

为探究掺烧生物柴油耦合废气再循环（EGR）技术对柴油机燃烧和排放性能的影响，基于TBD234V6型柴油机，运用AVL-fire软件建立仿真模型，对柴油机在75%中高负荷下运行时，0%、5%、10%和15%等4组不同EGR率与10%、20%、30%和40%等4组生物柴油掺混比进行仿真分析。仿真结果表明：在相同EGR率下，随着生物柴油掺混比增大，爆压、CO排放量和Soot排放量均呈下降趋势，NO排放量明显上升，当掺混比为40%时，柴油机各项性能值相比原机变化最为明显，爆压下降约16.3%,CO排放量下降约34.2%,Soot排放量下降约92.8%,NO排放量升高约35.7%；在相同掺混比下，随着EGR率的增大，爆压下降且滞后，NO排放量下降，当EGR率为15%时，相比掺混比为40%、EGR率为0的情况，爆压下降1.3%,NO排放量下降49.9%。通过增大喷油提前角对掺烧生物柴油耦合EGR技术进行优化，选取喷油提前角为29°CA、27°CA、25°CA、23°CA和21°CA进行研究。优化结果表明：增大喷油提前角有助于提升掺烧生物柴油耦合EGR技术的动力性，降低Soot和CO排放，当掺混比为...     

铝合金型材在汽车驾驶室上的应用

介绍了铝合金型材驾驶室的优点,分析了铝合金型材的挤压工艺及焊接工艺性。     

500 m水深张力腿平台总体运动性能分析

为了验证张力腿平台在中国南海500 m水深下的环境适应性,采用时域耦合分析的方法分析500 m水深下张力腿平台的总体运动性能,重点分析张力腿平台关键运动参数,如平台水平位移、升沉运动、气隙和筋腱张力等,基于模型试验修正的数值分析,结果表明,张力腿平台在南海500 m水深下具有良好的运动性能,可以满足作业要求。     

基于ETAP软件的自升式生活平台初步设计

给出了用ETAP软件规划海洋自升式平台电网的计算分析知识点。探讨计算分析结果内容的理解,对电网规划的经济性和实用性进行反思,并给出建设性意见。