一套预测冰面上汽车牵引力的模型

根据传热学中的热平衡原理及冰的摩擦经理论，建立了冰面汽车牵引力的预测模型。研究表明：所建立的理论模型比已有的模型更接近实际，从摩擦学角度系统分析了汽车工作条件和环境因素以及表面粗糙度等对牵引力的影响，提出了今后研究中有待解决的几个问题。     

汽车车轮流场的数值模拟

首先以独立车轮为研究对象,以商用计算流体力学软件STAR—CD为工具,利用移动边界条件,并依据k-ε双方程高雷诺数湍流模型对三维定常不可压缩流N-S方程进行数值模拟计算．然后在合适尺寸的计算域下对3种不同宽度的静止和滚动车轮分别进行数值模拟计算,研究车轮宽度和来流速度对阻力系数的影响,将计算结果与实验结果进行了对比分析．计算结果表明,车轮宽度的减小以及来流速度的减小均明显降低汽车的气动阻力系数．     

用固体润滑剂改善汽车刮水胶条使用性能的研究

作者将含有MoS_2和石墨的不同配方的固体润滑涂料刷涂在几种国产汽车刮水胶条上,并分别于干摩擦和水润滑的两种刮刷状态下,就固体润滑剂改善刮水胶条的擦拭性能进行了试验研究,指出这是使刮水胶条降低擦拭阻力、提高刮刷效果的可行途径,同时强调配制涂料时应当选用颗粒细小而均匀的固体润滑剂粉末。     

车用塑料耐刮擦测试方法概述

耐刮擦测试是汽车内外饰塑料零件质量控制的一项重要指标。介绍了耐刮擦测试原理,刮擦头、负载、样品与刮擦头相对运动状态等是决定测试方法的关键技术要素,评价塑料耐刮擦性的方法分为目视法及仪器测量法。综述了五指刮擦法、硬度试验笔刮擦法、网格刮擦法、摩擦色牢度刮擦法及其他刮擦法测试方法,分析和总结了不同测试方法的特点和应用范围。     

变湿工况条件下热泵空调系统的换热及热力学特性分析

1引言空调系统的热湿负荷计算、设备选型和系统设计，都是根据冬夏两季室外空气计算参数和室内最大的热湿负荷决定的。这是空调系统最不利的运行工况。实际上室外空气的状态参数会随季节变化，室内热湿负荷也会随生产工艺过程和室内人员的活动状况随时间变化。不同行业对?..     

Analysis of the Wrinkle of an Automobile Weather-Strip Seal in Bending

Weather-strip seals in automotive door systems play a major role in determining the door closing effort, isolating the passenger compartment from water and reducing the wind noise inside the vehicle. The phenomenon of a wrinkle often occurs in weather-strips when they are assembled on the door surfaces which have bent or twisted profiles. Wrinkles in automobile weather-strip seals will affect the closing effort and noise isolation characteristics of the automotive door system. The wrinkle of anethylene-propylene-diene (EPDM) automobile weather-strip seals when bent and the critical conditions for a wrinkle to develop were characterized in this study. The hyperelastic material behavior of the EPDM sponge and EPDM dense rubber in the seal were modeled using the Foam model and Mooney–Rivlin model, respectively. Then a finite element analysis (FEA) model of the automobile weather-strip seal in assembly was developed and analyzed using then on linear FEA software Marc. The deformation of the seal and the thickness decrease in the critical region where it was prone to wrinkle were obtained by this FEA method. Finally the critical criterion of wrinkling was determined by analysis of the reaction forces in the critical region. The proposed analysis method can shorten the product design cycle and decrease the design and trial-product cost considerably.     

New developments of advanced high-strength steels for automotive applications

Automotive industry asks for higher resistant steels to lighten parts and improve crash resistance. Keeping a good ductility while increasing tensile strength requires the development of new grades in which hardening mechanisms counteract the drop in elongation when enhancing mechanical resistance. This is mainly achieved with multiphase steels and completing dislocation hardening by twinning and martensite transformation during straining. This has led to high-strength steel families, some of them being already used in body in white (Dual Phase (DP) and TRIP steels). Others, still in development, will soon emerge on the market (Quenched and Partitioned (Q&P), medium-Mn steels or TWIP).     

近红外传感器在汽车改造技术中的应用研究

利用反射式近红外传感器及语音录放组件,研究了汽车倒车防撞语音提示器。当汽车倒车时,只要距车身后尾一定的距离内有人或物体存在,就会有一部分红外光信号经人或物体反射回来,被与发射管同排安装的光敏接收管收到并转换成同频率的电信号后,由模块内部电路进行放大、解调、整形、比较处理后,在输出端输出控制信号,控制语音录放组件工作,告诉司机车后有人、车后有物体。由于近红外线传感器、语音录放组件均为一体化结构,成本低、接线简单、抗震能力强、测量准确、工作稳定可靠,适合在汽车上安装使用。     

一种微型空调器的优化设计

介绍了一种微型空调器的研制背景及设计方案 ,采用仿真优化的设计手段对空调器的制冷、制热系统进行了优化设计 ,实践证明其设计是成功的。同时说明了该型空调器所具有的特点及应用场合     

变频压缩机空调系统的理论分析及实验研究

变频空调器是由变频压缩机驱动的空调系统,压缩机通过变频调节其转速使压缩机单位时间内的排气量变化,从而达到调节制冷量的目的。本文提出了变频空调器制冷系统的原理和设计方法,具体给出了制冷量和压缩机频率的关系方程,并从理论和实验两方面对变频空调器制冷系统进行了分析,得到了频率曲线图,为变频空调器制冷系统的设计提供了依据。