浅谈中国汽车企业应对欧盟型式认证工厂审查

针对中国汽车企业的产品出口欧盟等国家地区的需求,介绍了欧洲的车辆法规和型式认证体系。阐述了型式认证中工厂审查的依据及内容,具体分析了工厂进行工厂审查所具备的条件,以及需要重点注意的方面。     

基于加速度剂量的汽车座椅动态舒适性仿真分析

利用加速度剂量法对汽车座椅的动态舒适性进行分析和评价,并且通过Matlab进行仿真研究。通过分析作用在脊柱水平和垂直方向上的加速度剂量的大小来评判对身体损害的程度,从而为汽车座椅在振动舒适性设计方面提供参考。     

浇注式沥青混凝土在桥面铺装中的应用研究

浇注式沥青混凝土有着不透水、整体性强、柔韧性好和抗老化性能优良的特点.近年来在大中型桥梁,特别是在钢桥桥面铺装中得到了较多的应用,引起了人们的关注.该文结合浇筑时沥青混凝土在工程实践中的应用,对其基本性能作了进一步的探讨.     

昆明东北二环立交系统桥梁附属工程设计

该文介绍了昆明东北二环立交系统工程的桥梁附属工程中防撞墙、桥面防水、桥面铺装、桥上及引道排水、伸缩缝的设计情况,总结出其设计思路及设计要点.     

城市道路用新型中分带护栏开发

结合依托工程,参考国内外相关标准,综合城市快速路桥梁交通流状况、景观以及维护要求等因素,提出一种新型城市用中央分隔带护栏结构,运用有限元仿真技术对其进行优化和安全防护性能评价。结果表明,新型中央分隔带护栏结构能够有效阻挡车辆,护栏各项指标均满足评价标准要求,防撞等级达到Am级,适用于城市快速路中央分隔带。     

汽油机次级线圈标准点火波形分析

汽油机气缸内的点火过程涵盖了很多信息,对点火线圈中次级线圈波形分析是现代汽车故障检修的重要和快捷方法。熟练掌握次级线圈标准点火波形各部分的所反应的状况对每一位汽车维修技师来说是一门必修课。     

工业时窗小波降噪调制连续线性动力学系统参数直接辨识

在时窗内对噪声干扰的信号进行小波降噪,对降噪数据调制积分得等价的代数方程,利用最小二乘算法,进行线性动力学系统参数的直接估计．针对受噪声污染的系统参数估计的有偏性,借助时窗降噪调制方法构造辅助变量,提出了降噪调制辅助变量递推算法,进行了系统参数的无偏估计．仿真实验和应用实例表明,该方法具有有效性和实用性,可为工业在线辨识获得可信的系统参数提供参考．     

基于非饱和非稳定渗流场的滑坡稳定性分析

以鹰厦铁路K290滑坡为原型,基于降雨入渗情况下滑坡体呈饱和-非饱和渗流状态下,通过计算得到坡体孔隙水压力和体积含水量随降雨及地下水位变化的基本规律,进一步导入SIGMA/W程序并依据坡体孔隙水压力和体积含水量及地下水位变化特征分析了滑坡应力场,探讨了降雨强度、降雨持时和水位变化对滑坡体稳定性的影响.     

Monte Carlo simulation of B2-L2<Subscript>1</Subscript> ordering transitions in Au-Cu-Al alloy systems

The B2-L2₁ ordering transitions in Au-Cu-Al shape-memory alloys are studied by the Monte Carlo exchange simulations, where a set of the first, the second and the third nearest-neighbor mixing potentials for Cu-Al in the Au-Cu-Al alloys are calculated from first principals using the Connolly-Williams methods. To ensure the phase stability of the β-Au-Cu-Al, the investigation includes the range of compositions Au₂Cu_1−x Al_1+x (−0.15 ⩽ x ⩽ 0.15). The B2-L2₁ transition temperatures are predicted, and are in agreement with the experimental results. The atomic ordering around vacancy of the L2₁ structure is further discussed.     

Multi-element ultrasound phased array applicator for the ablation of deep-seated tissue

High-intensity focused ultrasound (HIFU) has attracted increasing interests as a promising noninvasive modality for the treatment of deep tumors in the thoracic and abdominal cavity. A 90-element HIFU spherical phased array applicator operated at 1MHz has been developed for deep tissue ablation. The spherical array with a 5 cm wide central hole has a 21 cm diameter and an 18 cm radius of curvature. Annular element distribution with unequal element spacing is used to reduce the number of elements. The array is constructed with piezoelectric lead zirconate titanate (PZT-8) circular elements that are 1.4 cm in diameter and have a wall with thickness of 0.2 cm. The array offers an effective ablating depth of at least 8 cm in the tissue for both simulations and ex vivo experiments. The simulations demonstrate that the developed array can steer the focus with good quality of intensity distributions up to 6mm off center over ranges from 17 to 21 cm when the water depth is set at 11 cm. We also present the beam focusing capability in deep tissue through a series of ex vivo experiments by measuring discoloration areas after sonications. These results indicate that the developed array is ideal for the ablation of deep-seated tissue.