共查询到20条相似文献，搜索用时 109 毫秒
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超声波振动辅助磁力研磨加工研究 总被引：17，自引：0，他引：17
根据研磨加工的材料去除模型,分析得到增加研磨压力是提高磁力研磨加工效率的可行手段。通过在单纯磁力研磨工艺中引入超声波振动,增加了研磨粒子的瞬时研磨压力。经实验证明,在超声振动辅助磁力研磨加工中,研磨粒子在水平切削和垂直冲击挤压运动的综合作用下,对工件材料的去除率高且表面质量均匀;加工效率较单纯磁力研磨工艺提高了约50%;工件表面粗糙度Ra可降至0.06 μm左右;电子显微镜观察发现其加工后工件表面形貌较单纯磁力研磨细密均匀;采用X射线干涉仪检测得知,经超声振动辅助磁力研磨加工后的工件材料（SUS304）表层的应力状态已由原始的残余拉应力+320 MPa变为压应力-40 MPa,有效提高了工件的疲劳强度。 相似文献
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设计一种以专家系统为核心,包括批次式种子包衣机和包衣质量图像检测系统的智能化控制系统。以种子包衣品质和合格率为目标,通过构建基于神经网络的包衣参数自学习和智能混合参数优化策略系统,根据经验知识库和实时反馈值,对包衣机的加工参数实现在线优化。采用Lab Windows/CVI开发平台编制系统软件,实现参数设置、加工参数推荐和优化、数据通讯、设备控制、运行参数和画面显示、手动调校、数据存储查询等功能。系统与批次式包衣机配套应用,结果表明整机的智能化水平明显提升。专家系统能够针对不同种子自动优化组合加工参数,在满足包衣品质和合格率的前提下,提高效率,节省包衣剂用量,效果显著。 相似文献
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设计了一种基于神经网络推理的汽车空调压缩机故障诊断专家系统。此系统将传统专家系统与神经网络技术科学地加以综合,弥补了传统专家系统的诸多缺陷。专家系统的知识库由两部分组成,即浅层知识库和深层知识库。推理过程由神经网络完成,并带有解释说明模块,主要说明诊断结果的判定依据。实践证明,这种方法能较好地解决传统专家系统存在的问题,提高系统的诊断速度和准确率。 相似文献
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现代设备大多数集机电液信于一体，对其所出现的故障做出准确而迅速的判断，单纯地依靠传统的故障诊断专家系统是不够的。为此，把神经网络和传统的专家系统相结合，建立神经网络专家系统，达到优势互补的效果。在神经网络诊断中，采用MATLAB的神经网络工具包建立了径向基函数神经网络诊断模型，并以柴油机燃油系统故障诊断为例，验证了该系统的可行性。 相似文献
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针对几种常见的智能技术进行分析,总结了神经网络控制技术、模糊理论控制技术、智能监控技术、专家系统控制技术、线性最优控制技术及综合智能控制系统的应用,提出了智能技术在电力系统自动化中的要点。 相似文献
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利用神经网络技术建造工艺设计专家系统 总被引：3，自引：0，他引：3
针对传统人工智能专家系统的缺点，引入了以并行计算为主的神经网络技术，并成功地运用它来建造工艺设计专家系统。神经网络中的ＢＰ（ＢａｃｋＰｒｏｐａｇａｔｉｏｎ）模型用作规则记忆器，每一模型中，知识库和推理机是合二为一的，许多这类模型构成系统的知识库。工艺路线的最后决策通过数据驱动的正向推理来实现 相似文献
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随着农机液压系统的功能越来越多、结构越来越复杂,加上农业机械的工作环境较为恶劣,其发生故障的几率也将随之增多.为此,根据农机液压系统故障的特点,应用专家系统原理和面向对象的设计方法,设计了一种基于BP神经网络的农机液压系统故障诊断专家系统,阐述了该专家系统的基本结构,以及知识库、推理机和解释机的实现方法.该系统充分发挥了神经网络在处理复杂非线性关系时的优点,大大提高了农机液压系统故障诊断的效率和准确率. 相似文献
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Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m−1) and an infiltration rate of 5.8 mm day−1. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day−1), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day−1 was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration. 相似文献
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车用发动机润滑油失效规律与更换周期研究 总被引：7，自引：0，他引：7
研究在正常使用条件下１０Ｗ／３０－ＱＣ级润滑油用于某型车用发动机时所表现的失效规律,确认期服从两参数Ｗｅｉｂｕｌｌ分布,并给出分布的尺度参数η和形状参数ｍ之最佳线性无偏估计（ＢＬＵＥ）同时,还为定量分析,计算车用发动机润滑油的使用可靠性和合理确定其更换周期提供了一套可供借鉴的方法,并给出了具体的计算实例。 相似文献
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赵国杰 《农业机械化与电气化》2011,(4):106-107
乡（镇）农技推广体系是农业发展的关键。介绍朝阳市农业技术推广体系的现状,针对目前体制及运行机制、服务手段等方面存在的问题,提出适合朝阳市乡（镇）农技推广体系改革与发展的对策,以期对全省农技推广体系改革和发展起到一些借鉴作用。 相似文献
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苑庆刚 《农业机械化与电气化》2010,(3):52-54
草莓果味酸甜爽口,营养价值高,为人们所喜爱的应市鲜果之一。由于草莓易受损伤和微生物侵染,因此其采收、贮藏过程极为重要。介绍草莓采收过程中的注意事项以及11种贮藏保鲜技术的实施步骤和操作方法,推介9种加工方式,为草莓产业化提供技术支持。 相似文献
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瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。 相似文献
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对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。 相似文献
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对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。 相似文献
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在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。 相似文献
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About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered. 相似文献