SAE8620H钢齿轮的热处理

SAE8620H钢齿轮采用等温正火工艺，获得了理想的硬度、金相组织和良好的切削性能。渗碳时选取合适的温度，采用热油淬火，产品达到了图纸的技术要求。     

基于J1939协议的电动轮自卸车数据采集与处理系统设计

通过构建一个J1939协议网络来完成电动轮自卸车的数据采集,并把采集到的数据通过触摸屏液晶显示;相比原有的无协议网络的数据采集系统,性能有了大幅提高;针对煤矿企业的实际需要,特别增强了称重数据的采集与记录功能;同时为了适应煤矿企业数字化发展的主流,在机车上加入了GPRS无线数据传输、GPS定位等功能,这些功能的引入,不仅便于煤矿企业对产量进行统计,而且给煤矿企业对机车的数字化管理带来了方便,从而提高企业效益.     

一种基于BOA-SAE-EELM的光伏阵列故障诊断方法

光伏阵列非线性输出的特性以及最大功率点跟踪算法,会影响光伏阵列保护设备的工作.为了正确辨识光伏阵列的运行状态,本研究提出一种基于贝叶斯优化算法(BOA)、堆栈自动编码器(SAE)以及集成极限学习机(EELM)相结合的故障诊断方法.首先,将光伏阵列的时序波形进行标准化处理;接着,使用SAE对标准化后的时序波形进行特征自动...     

混合电动车能量回馈控制系统设计

制造高性能的混合动力电动车的关键是其各个子系统的协调工作,以及各个子系统之间检测参数的共享,因此对各个子系统之间通信的实时性和信息共享性具有较强的要求。本文主要研究基于CAN总线的混合制动能量回馈系统,采用SAE 1939协议,搭建了CAN总线整车控制网络,系统根据工况将总制动力矩按不同比例分配为能量回馈制动、机械制动和ABS制动,实现最优制动。     

Effect of prestrain on cyclic creep behaviour of a high strength spring steel

Cyclic creep and fracture behaviour of SAE spring steel 5160 under two prestrain conditions were studied. The cyclic creep rate, cyclic plastic strain range, total plastic strain range and cyclic creep life of the material were all found to depend strongly on the prestrain condition. It was also found that, after a certain number of cycles, cyclic hardening would reach a saturation state, followed by cyclic softening which would last until the final failure. However, a higher prestrain delayed the appearance of cyclic softening. Prestraining was also found to extend considerably the third stage of cyclic creep and thus increase the elongation to fracture of the material to the extent observed in a uniaxial tension test. Fracture surface study exhibited a mixed mode failure process and also a transition from quasi-brittle fracture at the lower prestrain, consisting of both intergranular and transgranular features, to ductile fracture at the higher prestrain, which is mainly made of dimples and is similar to that found in a uniaxial tension test. However, in the ductile fracture area, some transgranular facets and fatigue striation regions could still be observed. Finally, when the prestrain reached a certain value, compressive cyclic creep was detected and this is attributed to a strong Bauschinger effect.     

Compatibility Tests for Some Model SAE 30-50 Engine Oil Formulations and Correlation of Properties

A series of laboratory tests have been conducted on commercially available model engine oils of SAE 30-50 grades obtained from different oil companies operating in Nigeria. Experimental analysis showed that these model oil formulations conform to certain standards governing their constituents and performance. All the samples have high viscosity index of 100 and above. Their pour points indicate low temperature fluidity and suitability to be used in cold weather conditions. Data correlation shows that viscosity and viscosity gravity constant (VGC) can be adequately used to characterize the oil samples. The semi-logarithmic plot of VGC against viscosity at 40°C produced the best correlation. The study further proves that VGC should find a wider application as a correlating parameter for the physical property of model oils.     

新型PM传感器通信协议设定与软件设计

为了使集成CAN总线技术的颗粒物(PM)传感器能够与发动机的其它控制单元之间实现数据共享,以汽车行业比较通用的SAE J1939协议为传感器制定通信协议.同时采用模块化思路设计PM传感器控制系统软件,最后对控制系统的各个功能模块进行了实验验证.结果表明:PM传感器控制系统的设计和制作能够满足应用需求,为进一步推进PM传感器在实车上的应用打下了基础.     

基于SAE J1939协议的发动机通信控制器仿真与设计

SAE J1939协议是一种支持闭环控制的在多个ECU之间高速通信的网络协议[1]。主要运用于载货车和客车上。它以CAN2.0为网络核心并构建了符合OSI参考模型的多层协议,分别实现数据传输、网络构建、网络管理、故障诊断等功能。以SAE J1939协议为基础,对发电机组中电控柴油机数据实时采集与分析,判断发动机实际运行状态;建立一种可行的通信网络模型并对其仿真,验证其可靠性。针对沃尔沃TAD532GE型柴油机EDC4电控系统设计了通信控制节点,实现对发动机运行状况的实时监测。     

改进的H(e)NB位置锁定方案

主要研究了3GPPTR33．820等技术报告中的H（e）NB位置锁定机制。当前3GPP仅仅只是针对几种特定情形下的H（e）NB位置锁定提出了解决方案。鉴于此,在本文中我们提出了一个通用的改进的位置锁定方案。该方案可以用于一般情形下的H（e）NB位置锁定,解决了H（e）NB在实际使用中因不能可靠锁定位置所带来的多种安全威胁,并增加了H（e）NB位置锁定的可靠性以及锁定成功的概率。     

SAE1018Ti线材表面酸洗缺陷分析

针对包钢生产的SAE1018Ti线材酸洗后存在的表面圆斑缺陷,采用扫描电镜、能谱分析仪对缺陷进行了观察和分析。结果表明：结晶器保护渣的残留和铸坯表面氧化铁皮在轧制过程中的压入是造成线材表面缺陷的原因,通过加强铸坯保护渣的剥离和增强除鳞效果可避免该类线材表面酸洗缺陷的产生。