补贴退坡、外资进入背景下赣州新能源汽车产业发展研究

本文以赣州市新能源汽车产业为研究对象,梳理补贴退坡、外资进入背景下赣州市新能源汽车产业发展现状,并探讨产业发展中存在的问题,提出了加快赣州市新能源汽车产业发展的对策建议,从而为赣州市政府完善新能源汽车产业发展政策规划提供一定的借鉴价值,更好地推动赣州市新能源汽车产业链持续高速发展。     

Optimal Design for the Rear-Glass Joint of an Automobile for Squeak and Rattle Noise Reduction

Ever since vehicle noise, vibration, and harshness (NVH) reduction technology made dramatic improvements, vehicle interior noises represented by Squeak and Rattle (S/R) becomes an ever more important factor to improve the emotional quality of vehicles. Generally, people detect S/R noises on automotive interior parts, brake system, suspension, Body in White (BIW), etc. Among them, the rear-glass joint is a major source for vehicle interior noise, and can cause S/R noises under a variety of environmental and driving conditions. This study uses, two approaches, experimental and numerical approaches, to define the cause of S/R noise at the rear-glass section. Based on these two approaches, this study confirms that S/R noises generate through the contact between bottom side of molding and BIW. The sealant penetration length, panelmolding distance, and sealant width are the parameters affecting noise generation. In addition, this study created an optimal design with Design of Experiments (DOE) of the rear-glass joint. The design maximized the sealant penetration length, which is a parameter that majorly affects noise. The optimal design comprises of two steps: sealant injections shape optimization and rear-glass joint parameter optimization. Each step is carried out with FEA and validated by sealant penetration experiments. Through these optimizations, this study obtained an optimum combination of design parameters and fignificantly reduced the noise generated by rear-glass section.     

图的相对结合数与图的结构的两个新结果

在已有研究的基础上，进一步讨论图的相对结合数rb(G)与图的结构的关系，主要得到有关rb(G)=n-6和rb(G)=4-n时的结果。     

减振板在汽车前围板上的应用

为推广减振板在汽车前围板上的应用,选用了以DC06冷轧板为基板的减振板,以某车型前围板为试制对象,综合进行了力学试验、冲压试冲、点焊试验、拔洞试验等性能研究。结果表明,减振板的力学性能与普通汽车用钢板无明显差异;产品设计选型时采用简单平直结构翻边可有效规避冲压时弧度结构翻边而产生的易分层问题;如采用工频焊机需对减振板上下面添加导电旁通来提高导电性,采用中频焊机则不需添加导电旁通,但要使用混合功率模式或双脉冲恒流模式的焊接工艺参数来提高导电性;工频焊接与中频焊接的焊接工艺参数均可形成有效熔核。在此工艺条件下,减振板可用于汽车前围板的应用。     

PA44在CTA逆变电源中的应用

在分析ＣＴＡ逆变电源中放大单元不足的基础上，提出了一种利用新型器件ＰＡ４４构成电压放大单元的方法。实验表明设计合理，具有较好的利用价值。     

A Multilevel Secure Relation-Hierarchical Data Model for a Secure DBMS

A multilevel secure relation-hierarchical data model formultilevel secure database is extended from the relation-hierarchical data model in single level environment in this paper. Based on the model, an upper-lower layer relational integrity is presented after we analyze and eliminate the covert channels caused by the database integrity. Two SQL statements are extended to process polyinstantiation in the multilevel secure environment. The system based on the multilevel secure relation-hierarchical data model is capable of integratively storing and manipulating complicated objects (e.g., multilevel spatial data) and conventional data (e.g., integer, real number and character string) in multilevel secure database.     

贝氏体车轮钢性能分析

针对铁路车轮使用中存在的剥离问题,对新研制的贝氏体车轮钢进行检验.力学性能检测结果说明,与普通CL60车轮钢相比,新型贝氏体车轮钢的强度提高13%,塑性变形能力提高23%,冲击韧性提高2～3倍;通过金相组织观察、SEM断口分析、X射线衍射组织测定和TEM分析得出:新型贝氏体车轮钢为细而均匀的贝氏体 铁素体 少量粒状贝氏体组织,冲击断口具有典型的韧性断裂特征,钢中残余奥氏体含量为12%,显微组织主要由条状铁素体组成,未见碳化物析出相,为无碳化物贝氏体组织.分析结果表明:新型贝氏体车轮钢能显著提高车轮的抗剥离性能,具有更高的运用安全性.     

叶集至信阳高速公路绿化现状浅析

根据信阳气候、土质等自然条件的特点,分析了叶集至信阳高速公路绿化的现状、设计理念、生态绿化模式,指出了存在的问题,并提出改进建议。     

公路涵洞跳车原因及综合防治措施

结合沈阳至彰武高速公路及辽中至新民高速公路设计与施工实际情况,对涵洞跳车成因与综合防治措施及对涵洞台后填料进行压浆加固进行探讨.     

连续箱梁桥偏载系数三维有限元分析及工程应用

该文对利用三维实体单元建立连续箱梁全桥模型求取偏载系数进行了研究,并将实体单元结果,与薄壁杆扭转理论、修正偏压法、偏压法、经验系数法进行了对比分析。结合工程实例,进一步介绍了利用三维实体单元计算连续箱梁偏载系数的方法。