导球式限滑差速器结构及工作原理

限滑差速器可提高汽车驱动性、通过性及操纵稳定性。简述了车用限滑差速器的分类及其优、缺点。导球式限滑差速器是近年新出现的一种结构简单的转矩敏感式限滑差速器。介绍了导球式限滑差速器的结构,论述了其差速运动及限制滑动的原理。     

How can the maritime industry meet Sustainable Development Goals? An analysis of sustainability reports from the social entrepreneurship perspective

Sustainability Development Goals (SDGs) are a comprehensive agenda agreed upon globally that aims to stimulate actions towards economic, environmental and social sustainability. Being one of the key stakeholders, the international maritime industry plays an important role in contributing to global sustainability. By applying the concept of social entrepreneurship (SE), this study aims to examine (1) the basic and extended responsibilities (SDG 1–SDG 16) and (2) the potential collaborations within the value chain (SDG 17) concerning SDG implementation in maritime industry. To achieve these, we conduct a content analysis of sustainability reports published by container shipping liners and terminal operators from 2016 to 2019. More specifically, manual text classification is adopted to categorise the text content of sustainability reports based on 17 SDGs, and automatic text mining is employed to further identify the key roles of maritime industry related to each SDG. A unified framework is proposed, which points to varied motives and levels of comprehensiveness of the sustainability efforts by the maritime industry. This framework reveals the theoretic process of maritime industry's transitional involvement in sustainability from the SE perspective. It also creates managerial implications regarding the resource allocation strategies by maritime industry in meeting SDGs.     

大吨位汽车吊少支架安装钢管拱施工技术探讨

汽车吊安装以其施工工艺简单、施工快速、费用低等优点广泛应用于梁拱组合桥的钢管拱安装施工中。文章结合百色市百林大桥工程实例,介绍大吨位汽车吊少支架安装钢管拱施工技术,为今后类似工程提供借鉴。     

车辆-行人法规实施的重要性研究

行人安全技术应用在汽车上可以降低汽车一行人碰撞中行人的伤害，因此，我国应该实施行人保护法规，促使汽车生产企业加速行人保护方面的研究。文章通过对道路交通事故中行人伤害所占的比例分析，说明了在我国开展行人保护研究的重要意义。阐述了在汽车与行人的碰撞过程中，汽车可能对行人造成伤害的主要部分，从而对改进汽车相关结构提出重要依据。力图从根本上提高汽车的被动安全性能，使我国的汽车工业向更加完善的方向发展，从而使我国的汽车技术和世界汽车技术接轨。     

油气管道完整性维护决策优化方法

阐述了一种处理管线维护资源最优分配的技术——基于风险的管线完整性维护决策优化技术。针对目前研究工作的范围和重点,具体阐述了基于风险的管线完整性维护决策优化的要点和实施步骤;提出2种优化方法:效用函数和有限费用优化;指出了难点,提出了建议。     

Development of evolutionary cone type LSD for SUV/RV utilizing the axiomatic approach and the ultrasonic nano crystal surface modification technology

Surface topology, cone angle and the forces acting on the cone of the clutch type limited slip differential (LSD) are major design parameters for the bias ratio and the noise condition. Therefore much research has been dedicated to these developments but the results have been used to submit patents. A new cone type limited slip differential for sport utility vehicles and recreational vehicles, which has a very simple structure and easy compliance with the vehicle performance, has been developed by the axiomatic approach and the ultrasonic nano crystal surface modification (UNSM) technology. The design criteria and optimal value of the design parameters are determined by the axiomatic approach utilizing CAE tools. Test methodologies in a test rig and in a vehicle were also developed. Test results showed good performance of bias ratio and noise level but durability is still under testing. This study is an extension of F2006P266, FISITA 2006.     

朝阳珠江斜拉桥主桥箱梁少支架施工方法

介绍了朝阳珠江斜拉桥主桥箱梁采用的少支架施工方法,包括少支架的布置、少支架的安装、预压及拆除,可为相似条件下桥梁上部现浇箱梁施工提供参考。     

预压弹簧摩擦片式防滑差速器的优化设计

针对某款SUV后驱动桥的轮间预压弹簧摩擦片式防滑差速器结构,在综合考虑各种附着系数道路行驶的条件下,提出了预压弹簧摩擦片式防滑差速器的优化设计数学模型,应用混合离散变量组合型法(MDCP)对所给出的实例进行优化,并对优化的结果进行了分析。     

Development of a hydraulic limited slip differential system using a pressure generator

The limited slip differential (LSD) is a device that enables the driving force to be transmitted from one slipping wheel to the other by temporarily restraining the differential function when unwanted slipping occurs on muddy or icy roads. Many types of LSD have been developed, such as mechanical lock, disk clutch, viscous coupling, torsen and multiple clutch. This study designed a new type of hydraulic LSD using a pressure generator base on a trochoid gear pump and evaluated the performance of the new design.     

隔离层对贫混凝土基层水泥混凝土路面结构力学性能的影响

结合清连路现场试验测定的基本参数,运用考虑层间接触模型的三维有限元方法,重点分析了车辆和温度荷载作用下,不同隔离层下贫混凝土基层水泥混凝土路面结构主要指标的变化规律．分析结果表明,隔离效果越好,车辆荷载作用下路面受力状态越不利;与车辆荷载情况相反,即隔离效果越好,温度荷载作用下路面受力状态越有利;超载使各结构层主要力学指标值都明显增大,是造成路面早期损坏的主要原因之一;通过比较,发现有限元方法与规范方法计算得到温度应力差值较小,验证了利用有限元方法计算温度应力的可行性．