动态质量监控系统在高速公路工程管理上的应用

针对目前我国高速公路半刚性基层施工的质量控制难点,结合河南省化庄(省界)至新蔡段高速公路半刚性基层施工过程中质量控制的实际情况,对DTJ水泥稳定土动态质量监控系统的首次成功应用进行探讨。     

滑行艇高速航行时的数值模拟(英文)

Planing vessels are applied widely in civil and military situations.Due to their high speed,the motion of planning vessels is complex.In order to predict the motion of planning vessels,it is important to analyze the hydrodynamic performance of planning vessels at high speeds.The computational fluid dynamic method(CFD) has been proposed to calculate hydrodynamic performance of planning vessels.However,in most traditional CFD approaches,model tests or empirical formulas are needed to obtain the running attitude of the planing vessels before calculation.This paper presents a new CFD method to calculate hydrodynamic forces of planing vessels.The numerical method was based on Reynolds-Averaged Navier-Stokes(RANS) equations.The volume of fluid(VOF) method and the six-degrees-of-freedom equation were applied.An effective process was introduced to solve the numerical divergence problem in numerical simulation.Compared with experimental results,numerical simulation results indicate that both the running attitude and hydrodynamic performance can be predicted well at high speeds.     

迎浪规则波中波浪增阻和船体垂向运动的数值预报(英文)

The numerical prediction of added resistance and vertical ship motions of one ITTC (International Towing Tank Conference) S-175 containership in regular head waves by our own in-house unsteady RANS solver naoe-FOAM-SL JTU is presented in this paper. The development of the solver naoe-FOAM-SJTU is based on the open source CFD tool, OpenFOAM. Numerical analysis is focused on the added resistance and vertical ship motions (heave and pitch motions) with four very different wavelengths (0.8Lpp≤λ≤1.5Lpp) in regular head waves. Once the wavelength is near the length of the ship model, the responses of the resistance and ship motions become strongly influenced by nonlinear factors, as a result difficulties within simulations occur. In the paper, a comparison of the experimental results and the nonlinear strip theory was reviewed and based on the findings, the RANS simulations by the solver naoe-FOAM-SJTU were considered competent with the prediction of added resistance and vertical ship motions in a wide range of wave lengths.     

航海模拟器中破碎浪的建模

为实现航海模拟器视景系统中破碎浪的仿真,对近岸区域容易产生的崩碎波和卷碎波进行建模.采用光滑粒子动力学(Smooth Particle Hydrodynamics,SPH)方法对流体进行建模,以容易产生浪花的港区岸壁、码头等 为目标模拟区域进行抽象确定边界.基于SPH流体的粒子无序性和同时间步长位置相对固定等特点,对链表搜索法进行改进,提出前向链表搜索法,对SPH模型的近邻搜索算法进行了改进,使得粒子搜索时间复杂度大大降低,提高了粒子近邻搜索的效率.所建立的破碎浪模型具有较好的实时性效果.     

船舶余热吸收式制冷空调

吸收式制冷作为一种成熟的制冷技术,具有可利用废热、性能系数高、工质对无污染的优点.船舶余热资源丰富,如果能将陆地技术成果船用化,对节能、环保无疑将具有重大意义.从量化的角度探讨了吸收式制冷用于空调系统的可行性,对空调系统做出了初步设计,并进行了技术、经济性分析;针对船用过程中的技术问题,搜集了相关的研究成果,为进一步研究提供参考.     

运用软件ASCET实现电控柴油机的增压调节

采用增压调节可实时精确地调整电控柴油机的增压压力,从而提高柴油机的比功率和燃油经济性。文中利用ETAS公司的ASCET软件进行增压调节系统的模块设计、自动代码生成和硬件在环仿真。试验结果表明,增压调节可实现对增压系统的闭环控制,加快系统的响应。最后通过优化,进一步改善系统的稳定性和可靠性。     

胶体蓄电池在摩托车上的应用分析

胶体蓄电池是采用胶体电解液的阀控式密封铅蓄电池,具有优秀的深放电回复性、充放电利用率高、使用寿命长、恢复能力强等优点,随着人们对摩托车质量需求的不断提升,胶体蓄电池在摩托车上的推广应用具有广阔的前景,并将逐步取代常规蓄电池和AGM密封铅蓄电池。     

发动机无怠速控制装置简介

摩托车长时间怠速运行会污染空气,强行要求骑乘者在每次长时间怠速前预先关闭发动机也是不现实的,加上传统机动车电起动操作也较麻烦。摩托车电起动装置由蓄电池、点火开关、互锁装置（制动开关、空挡开关、离合器开关）、电起动开关、起动继电器和起动电机连接而成,打开点火开关,互锁开关闭合,起动继电器吸合线圈通电,产生磁场,吸合起动继电器内部工作触点,蓄电池电源送至起动电机,起动电机通电工作,机动车被起动。     

基于DEA的接运公交运营绩效评价

为了从换乘者角度评价接运公交的运营绩效,并根据评价结果进行运营管理的优化,以接运公交高峰小时发车数和同步发车数为输入指标,以接运公交实载率和换乘乘客平均候车时间为输出指标建立了DEA综合评价模型。利用C2R模型研究接运公交运营绩效的有效性和依据DEA综合评价模型的投影理论分析接运公交输入剩余和输出亏空,并将C2R模型与C2GS2模型相结合研究接运公交的规模收益。结果表明,目前大部分接运公交运营绩效处于非DEA有效状态,导致该结果的主要因素是其运营调度与轨道交通同步性水平偏低,因此运营管理优化首要目标是实现接运公交与轨道交通的同步运营,并以此为目标优化接运公交高峰小时发车数。     

制造工艺与车身工程开发集成应用技术

车身制造工艺是车身开发重要内容之一,是实现客户价值的关键环节。在产品开发中,早期体现车身制造工艺的要求是实现质量提升和成本降低的有效手段。文章概述了车身制造工艺的主要特征和车身开发流程,阐述了如何在技术和流程上早期体现车身制造工艺的要求,最后对技术开发与制造工艺相结合提出了新的展望。