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叙述了某种型号秸秆方捆打捆机的工作原理,介绍了打捆机在使用中出现的故障,根据故障现象,分析出了故障产生的原因。针对故障产生的原因,进行了深入的分析与研究,提出了最终解决故障的措施和方法,改进后故障消除,机器工作稳定,运行状态良好。 相似文献
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1 电源故障的一般特点 1.1 电源故障是电气装置的整体性故障 无论是电路故障,还是设备故障,就故障范围而言,都属于局部性故障,影响面相对较小.而电源是电路和设备工作之源."源"出了故障,将使整个电路和设备都不能正常工作.因此,电源故障属于整体性故障. 相似文献
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电动汽车因为清洁环保的优势,得到了广泛的推广和运用。目前随着电动汽车应用范围越来越广泛,其充电故障问题也逐渐受到重视。主要对当前电动汽车充电故障进行了梳理,并分析了导致电动汽车充电故障的原因,最后针对故障产生的原因,总结了故障处理的方法。以期为电动汽车充电故障的研究提供一定的参考。 相似文献
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设计构造了用于故障检测的系统观测器.根据故障对观测器新息的影响,给出了利用观测器新息的统计量对传感器故障和执行器故障进行检测的方法,并分析了该方法对故障检测的保障性条件.结合农产品加工中常用的热反应堆系统进行了故障模拟验证,结果表明这种检测方法计算简单,能有效检测传感器和执行器同时发生的故障. 相似文献
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对双侧电源220kV线路单相经高阻接地故障,利用故障录波报告信息和故障向量分析方法,阐明了两侧故障电流变化不同的原因,澄清了线路故障类型和性质,为故障点的查找提供了有力依据,并阐述了对继电保护动作的影响。 相似文献
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《农机化研究》2021,43(6)
为进一步提高播种机的故障自诊断功能与综合作业效率,结合智能数据挖掘技术对其故障监测系统进行应用研究。通过系统性了解播种机作业机理与监控系统实现目标,建立了播种机故障检测流程,将发动机、变速箱体、齿轮传动等部位故障转换成数据代码,根据智能数据挖掘技术的闭环控制机理,搭建故障监测理论模型,生成播种机故障监测系统功能架构,并进行故障监测系统应用试验。结果表明:保持15~25区间的数据挖掘核心算法有效规则数,可信度平均可达到0.84以上,较传统控制算法提升了3%,平均故障检测准确率为95.37%,较一般故障诊断应用技术提升了5.0%,故障平均检测耗时缩短了46.55%,提高了播种机故障监测效率,可为播种机及类似农机向智能数据化改进提供一定思路。 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