适应高爆发压力的高性能柴油机气缸盖设计

以某4DC发动机的基本参数为输入条件,对气缸盖进行了概念定义及详细设计,着重介绍了气道、油道、喷油器、配气机构和冷却水套的定义过程以及为保证气缸盖刚度和强度采取的技术措施,提出了气缸盖"W"型水套的概念。对该气缸盖设进行的设计评估结果表明,其使用性能、冷却性能、结构可靠性、铸造性能均满足设计要求,且气缸盖质量仅为30 kg,实现了气缸盖设计轻量化目标。     

浅析《现代外语》中两篇外语教学的实验报告

章通过对《现代外语》中两篇外语教学实验报告的分析，阐述丁在语言实验研究过程中，处理好各种变量的关系、总体样本与抽样之间的关系以及无关变量的控制对实验报告信度有很大的影响。     

INTERNET在箱运业务中的应用

随着INTERNET和电子商务的发展，世界上各大租箱公司也纷纷在网上开发自己的主页，并大力投资完善其功能，在信息查询、辅助交易和费用结算等方面进行了广泛的实践。同时，由于INTERNET的诸多优点．许多租箱公司还积极宣传和推动网络的运用，这对其降低经营成本、提高工作效率、提升公司形象和满足客户需求等产生了积极的作用。现将IN-TERNET在租箱业务中的应用情况介绍如下：     

杭州市交通状况及车联网市场前景的调研与分析

作为物联网在交通领域的应用,车联网可有效缓解当前的城市交通问题.为更好地把握车联网的市场前景,2012年底在杭州市开展了一次大规模随机抽样调查活动,在汽车4S店、二手车市场、高校、政府机关和企业内随机发放问卷共800份.根据对问卷结果的统计分析,绝大部分驾驶员对杭城交通状况十分不满意,造成交通问题的主因是车辆增长过快,大多数驾驶员对车联网应用及相关产品十分感兴趣,并愿意为之支付一定费用.由此可以推断车联网市场前景非常广阔.     

Lightweight mixture faults detection method for gasoline engine using on-line trend analysis

Mixture faults detection is meaningful for gasoline engines because proper mixture is the basic prerequisite for healthy running of a combustion engine. Among existing methods for faults detection, the data-driven trend analysis technique is widely used due to the simplicity and efficiency in time-domain. The CUSUM (Cumulative Sum Of Errors) algorithm is good at real-time trend extraction, but it’s easy to be costly on the fuel trim signal during the engine in normal working conditions, which will increase battery energy consumption because engine failure is rarely occurs. Hence, the conventional treatment methods of artifacts in the CUSUM algorithm are modified by means of decay function and detection time analysis. The thresholds are tuned according to the characteristics of artifacts instead of residual variability, which leads to better results of trend extraction and less computation. Then, the revised CUSUM algorithm is used for monitoring the mixture abnormal behaviors, and the mixture faults can be detected in real time through analyzing the variation features of fuel trim signal. The lightweight faults detector using the advanced CUSUM algorithm (FD-A-CUSUM) is evaluated on the experimental data collected from a Ford engine. The validation results show that while engine works under normal conditions, the computation of FD-A-CUSUM has decreased by 72.79 % in comparison with the detection method using the original CUSUM algorithm (FD-O-CUSUM), and the false alarm ratio of FD-A-CUSUM is 3.37 %. Futhermore, the detection results of FD-A-CUSUM for two leakage faults have achieved 91.18 % test accuracy.     

机器人用高精度RV减速机几何回差分析

分析并建立了机器人用高精度ＲＶ减速机几何回差计算的数学模型。并通过计算机模拟与生产实践予以验证。     

编者的话

<正>全社会都在关注"私人购买新能源汽车补贴政策实施细则",但至今尚未公布。私人购买新能源汽车补贴政策出台后市场前景如何?本期《私人购买新能源汽车补贴政策的市场前景》将分析市场前景不容乐观的一系列原因。     

EPS在高原多年冻土区铁路路基的应用研究

为了确保铁路路基稳定性，采用EPS保温材料的保温层对路基进行处理，研究了铺设EPS保温材料的路堤在上覆土层厚度不同时的路堤和路基的地温特性。     

INVESTIGATION ON FRACTAL CHARACTERISTICS OF WORN SURFACES OF POLYMER TAPES BY SAND DUST PARTICLES

Objective To characterize the abrasive wear of polymer tapes in ATM （Auto Teller Machine） servicing in sand dust environment. Aethods The abrasive wear experiment of polymer tapes, PEN （polyethylene-2, 6-naphthalenedicarboxylate） and PI （polyimide）, by sand dust particles is performed in ATM tribosystem. The fractal characteristics of the worn surface of polymer tapes and the corresponding wear mechanisms are examined. ReSults As main results, the worn surfaces of polymer tapes show bi-fractal characteristics, and PI tape shows higher fractal dimensions and finer wear profiles than PEN tape. Wear mechanism examination shows macro and micro ploughing and cutting grooves and micro fracture characters, which gives reasonable explanation of bi-fractal character of worn polymer tapes. Conclusion Worn polymer tape shows fractal character and bi-fractal can be used in accurately characterizing the abrasive wear of polymer tapes of ATM in sand dust environment.     

浅析汽车车身无痕修复技术的重要性及方法

随着全球经济发展的不断加深,机动车的数量也不断增加,改革开放以来我国的汽车产业发展速度非常快,2018年中国机动车保有量差不多有3.27亿辆,从数字上来看汽车的量非常庞大,随之而来的是汽车售后服务的跟进,特别是随着近年来交通事故率的上升,使汽车维修业务量不断增多,其中汽车车身钣金修复是维修业务量的重要组成部分,现在很多车主对汽车的各方面性能特别是车身安全性能的重视越来越大,而采用传统的钣金修复方式越来越不被车主看好,促使新型车身钣金修复方法的不断创新,本文主要讲述汽车车身修复新型方法中的无痕修复方法,通过对比无痕修复方法和传统修复方法的优缺点来阐述无痕修复在汽车售后维修中的重要性。