共查询到20条相似文献，搜索用时 62 毫秒
1.
驾驶员的工作一般是在驾驶室内完成的,因此驾驶室内的环境直接影响行车安全。随着高端拖拉机的日趋热销,拖拉机产品性能及品质也提升了一个新的台阶,尤其是拖拉机驾驶室舒适性也得以大幅提升,出现了密封性好、室内环境舒适的新型正压驾驶室。主要从拖拉机正驾驶室密封的原理进行分析,简述一种简便易用的检测技术。 相似文献
2.
通过对拖拉机空调关键组件、驾驶室总成及整机逐级进行的空调系统测试及分析过程中,探索了改进风道结构、提高风道密封性、提高驾驶室密封性及改进外循环风口结构的方法。这些方法经验证测试,工作效果得到了明显的改进。所以,将改进的措施进行固化,有利于提高空调性能。 相似文献
3.
4.
设计了拖拉机驾驶室舒适性满意度调查表,选取了30个典型的拖拉机驾驶员样本,调查了其对拖拉机驾驶室舒适性的评价,并用Excel软件对部分调查数据进行了分析。调查结果显示,样本对拖拉机驾驶室的外观颜色、造型以及内室的仪表、转向盘、指示灯的满意度较高,对座椅、踏板、操纵手柄的满意度较低;"密封性太差"和"夏天太热"是影响驾驶室总体舒适性的主要因素。该调查可为驾驶室的改进设计提供参考。 相似文献
5.
6.
通过对轮式拖拉机驾驶室随机振动环境的分析,提出了一种在室内模拟驾驶室田间随机振动环境的方法,经对某拖拉机驾驶室的室内模拟试验,取得了与田间使用和预测相一致的结果,验证了所提出方法的正确性。 相似文献
7.
8.
9.
在商用车实际生产过程中发现,驾驶室外覆盖件及相关部件固定用标准件会出现漏雨问题,严重影响整车性能。为提升驾驶室密封性,对各种常用标准件进水原因进行分析,从结构上改进标准件密封性能,并形成通用设计标准,在以后的产品设计中加以广泛应用。 相似文献
10.
以某轻卡驾驶室为研究对象进行自由模态试验,建立有限元模型并进行了有限元模态分析。通过模态实验结果和模态计算结果对比验证模型准确性。为避开发动机怠速激励频率,避免共振,以驾驶室部分板件厚度作为设计变量,通过尺寸优化提高驾驶室一阶模态频率。 相似文献
11.
12.
13.
14.
15.
《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
16.
17.
18.
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
19.
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
20.
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