车用永久磁铁缓速器的工作原理及使用

详细介绍了汽车用永久磁铁式缓速器的工作原理、使用方法，分析了三种不同类型永久磁铁式缓速器的结构，比较了三种结构类型的优点和各自的技术制约问题。     

正常年青人的诱发性耳声发射

在现有设备及条件的基础上,建立了一种高灵敏度的诱发性耳声发射(EOAE)测试系统,文中介绍了建立这一系统的具体方法及其测试条件。通过对15人30只听力正常耳的EOAE测试表明,短声和1kHz短音EOAE的检出率为100%,EOAE阈值与主观听阈密切相关,是一种比较理想的客观听力评价方法。该测试系统具有灵敏度高、信噪比大、抗干扰力强等优点,具有较强的实用性。     

37CrNi3钢过热后冷却方式对断口遗传的影响

本文结合金相组织,宏观断口和微观断口对37CrNi3钢经1300℃过热,并以不同方式冷却后,再经正常淬火消除过热粗大组织后出现的断口遗传现象进行了研究.结果表明,经过热后淬火,冷待淬火及空冷预处理所出现的断口遗传均属石状断口,其中经过热后直接淬火试样,断口遗传面积最小.     

Benzene concentrations on board chemical tankers

Maritime transport of benzene is regulated by the International Maritime Organisation (IMO). Two important guidelines for a ship’s crew in this matter are IMO circulars 1095 and 1220. The first one describes the minimum safety standards for ships carrying liquids in bulk containing benzene while circular 1220 deals with structural guidelines for new ships carrying liquids in bulk containing benzene, but also technical developments could help in improving safety and health protection on board chemical tankers carrying benzene in bulk. The aim of the present paper is to determine the benzene concentration in the working and living environment on board a modern chemical tanker carrying benzene in bulk, where all safety, technical and operational procedures described by IMO in the above-mentioned circulars are followed. During specific cargo operations, we measured the benzene concentrations on different locations on board by means of Radiello® passive diffusive samplers. Despite all measures taken, we found an important difference in benzene concentration between operations with a benzene cargo compared to operations without benzene on board, as well as inside and outside the accommodation. Moreover, even during discharge operations, where the emission is theoretically zero, we found an important increase in the benzene concentration. In addition, we found less favourable results for the engine room.     

集成化核动力装置运行支持系统设计分析

为防止和减少核动力装置运行人员的操作失误,采用将运行支持技术与运行人员认知过程相结合的方法,对运行支持系统进行设计分析,提出一个集成化核动力装置运行支持系统的体系结构,为开发实际系统提供参考.     

Numerical simulation of nonlinear wave force on a quasi-ellipse caisson

A three dimensional numerical model of nonlinear wave action on a quasi-ellipse caisson in a time domain was developed in this paper. Navier-Stokes equations were solved by the finite difference method, and the volume of fluid (VOF) method was employed to trace the free surface. The partial cell method was used to deal with the irregular boundary typical of this type of problem during first-time wave interaction with the structure, and a satisfactory result was obtained. The numerical model was verified and used to investigate the effects of the relative wave height H/d, relative caisson width kD, and relative length-width ratio B/D on the wave forces of the quasi-ellipse caisson. It was shown that the relative wave height H/d has a significant effect on the wave forces of the caisson. Compared with the non-dimensional inline wave force, the relative length-width ratio B/D was shown to have significant influence on the non-dimensional transverse wave force.     

Biomechanical properties and modeling of skin with laser influence

This paper studied experimentally and theoretically the biomechanical properties of skin with laser influence. Different types of tensile tests of the porcine skin in vitro were conducted to study effect of the laser, tensile strength, stress-strain relationship, influence of skin’s anisotropy and different regions, repetitive loading and stress-relaxation. A modeling of skin was developed according to the experimental results. The modeling provided insights into the important structure-function relationship in skin tissue with the laser effect. The nonlinear and anisotropic mechanical responses of skin are largely due to varying degree of fiber undulation which is effected by laser and outside forces. By introducing the laser factor into the constitutive modeling, the skin’s biomechanical properties and the mechanism of the skin repair with laser were discussed.     

蜗杆凸轮间歇运动机构参数化设计与动力学仿真

采用基于特征模型的造型方法,利用CATIA中CAA二次开发功能实现了蜗杆凸轮的参数化建模.然后在ADAMS中对蜗杆凸轮间歇运动机构进行动力学仿真,分析了啮合过程中输出轴角速度、角加速度及啮合力的变化特性.     

根式仿生基础应用技术研究

根式基础作为一种仿生结构,近年来在我国开展了一定的研究,并在部分工程中得到了成功的应用.该文结合相关理论分析、工艺试验、施工实践和应用实例,分析根式基础的应用技术,为该新型技术的推广应用提供参考.     

人机工程在驾驶员坐姿优化中的应用-朗逸转向柱人机优化

分析了中德人体尺寸的差异性.基于人体尺寸差异会导致驾驶坐姿发生变化,为此提出中国人体的驾驶员座椅调节范围相对欧洲人体可以适当缩小建议,为朗逸转向管柱由德国大众PQ34平台上采用的四向调节改为只有高度调节提供了必要的理论依据.对于只有高度调节的转向管柱,分析校核了转向盘/仪表盘视野和驾驶坐姿舒适度,设计结果为中国用户接受.