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空气动力学与汽车造型有着十分密切的关系.空气动力学的发展推动了汽车造型的发展.大大改善了汽车的动力性、燃油经济性,行驶稳定性和安全性.本文通过对汽车造型进行空气动力学的模拟分析,找出汽车造型对空气动力学的影响因素,从而得到优化汽车造型,改善汽车造型的空气力学性能的目的. 相似文献
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经济的发展推动了人们生活水平的提升,各大汽车企业开始将目光聚焦在电子设备和造型的更新换代上,推动了汽车造型设计技术的发展。文章就汽车造型设计中汽车设计新流程进行深入的探索研究。 相似文献
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汽车尾部造型时汽车空气动力学特性有很大的影响.绕汽车的流场在其尾部形成复杂的尾迹.在原始模型的基础上建立了三种不同尾部造型模型,应用FLUENT软件对不同尾部造型的尾部流场进行了数值模拟,得到了相应的阻力系数和尾部流场特性.通过对不同模型的流速和流线分布、湍流动能及不同横向截面涡系的比较分析,尾迹形状可以分为两类,讨论了不同尾部造型对尾部流场的影响,得出了较理想的尾部造型形式.在计算过程中,采用移动地面条件进行地面效应的模拟,提高了计算精度,结果可以为汽车设计提供参考依据. 相似文献
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《农业装备与车辆工程》2015,(3)
汽车的电气开关是内部造型元素之一,其位置和类型主要在造型阶段定义,造型设计师考虑的是造型的美观、时尚和传递其设计思想。但开关的位置和类型影响到驾驶员的操作方便性。通过研究汽车开关的分类和仪表台的分区,从人机工程和操作方便性角度讨论了汽车开关的总体布置,给造型设计提供建议。 相似文献
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农用运输车造型设计的美学准则应用 总被引:1,自引:1,他引:0
韩忠浩 《拖拉机与农用运输车》2001,(2):34-36
1 前言车身 (主要指驾驶室 )是农用运输车的重要部件 ,在保证使用功能的同时 ,要求造型合理、简捷、明快、美观、造价低。造型设计直接影响农用运输车的使用性能、成本和销售。本文对驾驶室外形设计及其与整车的协调比例关系等问题作了初步探讨 ,并对农用运输车造型设计问题提出不成熟的建议。2 农用运输车外形设计的特点2 .1 独特风格目前农用运输车的造型多是简单“移植”汽车的造型 ,外形与普通载货汽车没有太大的差别 ,区别只是制造工艺上的优劣 ,并且这一差别正在缩小。农用运输车规定的最高车速不超过 50km/h ,因此不必过分追求… 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献