混合动力电动汽车的使用与维护

针对混合动力汽车的结构特点,提出正确使用与维护混合动力电动汽车的内容和方法,以确保其各项性能良好发挥.     

广东省公路养护管理体制改革研究

分析了广东省目前的公路养护管理体制的现状,研究了现行公路养护管理体制下国省道、经营性收费公路管理中存在的主要问题以及公路养护管理体制与运营机制改革的关系,提出了广东省公路养护管理体制改革的几点政策建议.     

致力机制创新 促进农村公路可持续发展

在实践科学发展观前提下，如何强化农村公路管理，创新工作机制，实行“五位一体”管养模式，服务社会主义新农村建设，促进区域经济快速可持续发展，进行了初步探讨，希望对推动农村公路管养工作有所帮助。     

粒子群优化算法在舰船维修费用分配中的应用

将舰船维修费用按照维修计划结构进行分解，通过回归分析方法，建立舰船维修总体效益与各项费用比例之间的分配优化模型，利用粒子群优化算法对模型最优化求解，计算实例具有较好的效果。     

双曲拱桥的养护检查分析

桥梁养护检查是进行桥梁养护、维修与加固的前期工作，是决定维修与加固方案可行和正确与否的可靠基础。     

有效性目标下的车辆最优维护周期

为准确确定有效性目标下的车辆最优维护周期,基于更新理论中的更新函数以及优化概念,分别建立了以有效度最大和以单位时间内总停驶时间最少为目标的2个最优维护周期数学模型。利用78辆某型商用车多年记录的运行故障数据和维修费用数据,进行了故障分布的参数估计和假设检验,在置信度大于0.95的前提下,确认车辆运行故障服从Weibull分布,并由所建模型解得车辆的最优维护周期里程为15617km。验证性分组试验结果表明:当二级维护周期取15122km时,车辆的有效度达到最大值0.9551;维护周期模型解与分组试验最优周期里程的相对误差仅为3.27%,模型的解准确可靠,符合实际。综合模型研究和实车验证性试验结果,最终认定有效度最大目标意义下的车辆最优二级维护周期为15000km。     

微表处施工常见问题与处治措施

介绍了微表处的施工工艺，着重从施工准备过程、摊铺工艺和养护展开阐述，对其施工过程中常见的混合料拌和时间短、表观效果羞、摊铺厚度不够、表面泛油和接缝不美观等问题进行了分析研究，阐明其形成机理，并提出了相应的解决办法。     

浅述公路养护工程质量的评定

重点介绍了公路养护的内容及其质量等级的评定,并具体分析了分项计分标准。     

Failure rates and data driven policies for vehicle safety inspections in Pennsylvania

Rail, truck, commercial bus, and aircraft have federally mandated safety inspection programs in the United States, while inspections of personal vehicles, which make up the majority of passenger miles, are optionally imposed at the state level. In recent years, some states have chosen to eliminate the vehicle safety inspection program because of budget constraints and concerns about program effectiveness. Currently, 26 states have a schedule for conducting safety inspections, but Pennsylvania is one of thirteen states that currently require all personal light duty vehicles to be inspected every year. The remaining states have completely eliminated safety inspection programs. However, as automobiles become safer, Pennsylvania legislators are now pushing to phase out the inspection program to reduce the costs of owning a vehicle. This study combines Pennsylvania vehicle registration data with two large samples of results from state safety inspections. We find that the state safety inspection fail rate for light-duty vehicles is 12–18%, well above the often-cited rate of 2%. Vehicles that are older than three years old or have more than about 30,000 miles can have much higher rates. When analyzing new vehicles, less than or equal to one year old, it is found that even these vehicles have a failure rate greater than zero. Furthermore, while the vehicle fleet appears to be getting safer over the past few years by improvements in technology or other external circumstances, the inspection failure rate does not appear to be trending toward zero in the near future. We also show that accurate inspection data is limited and often incorrectly analyzed. Lastly, the importance of vehicle maintenance over a vehicle’s lifetime is proven to be evident, since regular usage causes vehicles to deteriorate. We conclude that vehicle safety inspections should continue to be implemented in order to keep driving conditions safe.     

关于做好危险货物运输车辆维修管理工作的思考

阐述了做好危险货物运输车辆维修管理工作应采取的措施,确保安全运输,保障人民群众生命财产安全。