Optimization of CNC cutting parameters using design of experiment(DOE) and desirability function     

Ender Hazir  Emine Seda Erdinler  Kücük Hüseyin Koc 《林业研究》2018,(5)

In this study,2~5 (five factors at two-level factorial design) design of experiment was applied to investigate a set of optimal machining parameters to achieve a minimum surface roughness value for Abies nordmanniana.Wood specimens were prepared using different values of spindle speed,feed rate,depth of cut,tool radius,and cutting directions.Average surface roughness (R_z) values were applied using a stylus.The objectives were to:(1)obtain the effective variables of wood surface roughness;(2) analyze which of these factors had an impact on variability in the CNC machining process;(3) evaluate the optimal cutting values within the range of different cutting levels of machining parameters.The results indicate that the design of experiment(DOE) based on the desirability function approach determined the optimal machining parameters successfully,leading to minimum R_a compared to the observed value.Minimum surface roughness values of tangential and radial cutting directions were 3.58 and 3.21 μm,respectively.  相似文献   

ENABLING CROP DIVERSIFICATION TO SUPPORT TRANSITIONS TOWARD MORE SUSTAINABLE EUROPEAN AGRIFOOD SYSTEMS     

Antoine MESS&#  AN  Lo&#  c VIGUIER  Lise PARESYS  Jean-No&#  l AUBERTOT  Stefano CANALI  Pietro IANNETTA  Eric JUSTES  Alison KARLEY  Beatrix KEILLOR  Laura KEMPER  Fr&#  d&#  ric MUEL  Barbara PANCINO  Didier STILMANT  Christine WATSON  Helga WILLER  Ra&#  l ZORNOZA 《农业科学与工程前沿(英文版)》2021,8(3):474

• Crop diversification is a dynamic pathway towards sustainable agrifood systems.• Technological and institutional barriers restrict uptake of crop diversification.• More coordination and cooperation among agrifood system stakeholders is required.• The European Crop Diversification Cluster calls for multiactor networks.European cropping systems are often characterized by short rotations or even monocropping, leading to environmental issues such as soil degradation, water eutrophication, and air pollution including greenhouse gas emissions, that contribute to climate change and biodiversity loss. The use of diversification practices (i.e., intercropping, multiple cropping including cover cropping and rotation extension), may help enhance agrobiodiversity and deliver ecosystem services while developing new value chains. Despite its benefits, crop diversification is hindered by various technical, organizational, and institutional barriers along value chains (input industries, farms, trading and processing industries, retailers, and consumers) and within sociotechnical systems (policy, research, education, regulation and advisory). Six EU-funded research projects have joined forces to boost crop diversification by creating the European Crop Diversification Cluster (CDC). This Cluster aggregates research, innovation, commercial and citizen-focused partnerships to identify and remove barriers across the agrifood system and thus enables the uptake of diversification measures by all European value-chain stakeholders. The CDC will produce a typology of barriers, develop tools to accompany actors in their transition, harmonize the use of multicriteria assessment indicators, prepare policy recommendations and pave the way for a long-term network on crop diversification.  相似文献   

日粮钙源颗粒大小对不同年龄产蛋鸡生产性能和蛋壳质量的影响     

M.Sk 《中国家禽》2011,33(10)

在蛋鸡生产中,人们主要关注其产蛋后期的蛋壳质量比较差,易碎.影响蛋鸡产蛋后期蛋壳质量的主要因素是蛋鸡的年龄和日粮中的钙.NRC(1994)估测蛋鸡钙的营养需要为每天每100g摄入的日粮中含有32.5 g/kg.然而,许多专家通过试验证实,当66～78周龄蛋鸡日粮中钙的含量由24～25 g/kg提高到36～40 g/kg时可以将产蛋率从79%提高到86%,蛋壳重量可以由5.64 g提高到6.12g,壳重/壳表面积由712提高到77.4mg/cm2.日粮中钙的含量提高至48～50 g/kg并不能进一步提高产蛋率,但是可以改善蛋壳重量和蛋壳厚度.58～73周龄伊莎蛋鸡日粮中添加40 g/kg钙就可以保证其产蛋性能和蛋壳质量.  相似文献   

保温苯板在土坝护坡防冻胀破坏的     

关洪涛  康宏泉  杨泽慧  宋剑鹏c 《中国农村水利水电》2005,(11):70-71

苯板是一种优良隔热保温材料，它具有吸水性小、不透水、耐腐蚀、抗老化和施工方便等优点，近年来苯板开始运用于渠道抗冻胀、土坝坝坡抗冻胀等水利工程，为水利工程的抗冻胀材料应用增加了新的选择方案。主要就苯板在土坝护坡抗冻胀设计计算和应用方面的经验进行了探讨。  相似文献   

工业以太网在宁东供水工程中的应     

王学福  黄继军徐晶c 《中国农村水利水电》2006,(12):58-59

本文主要介绍了工业以太网的发展历程、工业以太网的技术特点,以及在宁东供水工程的应用。与其他数字传输技术比较以太网具有应用广泛,价格低廉,通信速率高,软硬件产品丰富,应用支持技术成熟等优点.  相似文献   

水闸与泵站合建的一种新的布置型     

梁民阳  熊孟果c=h 《中国农村水利水电》2006,(6):82-83

通过比选水闸与泵站合建的三种主要布置型式，即并列布置、正交布置、立面分层布置，下沙排涝闸站选用正交布置型式，实现了水闸与泵站两者功能上相互利用，闸站具有布置紧凑、挡水面小，防洪可靠性高、运行管理方便的特点。正交布置型式适用于大多数建在堤塘上的排涝闸站，有较广泛的应用前景。正交布置中泵型选用潜水轴流泵，其组合是一种新的布置型式。  相似文献   

湖北省平原湖区排水涵闸工程老化     

吴瑕  关洪林袁达燚c 《中国农村水利水电》2007,(5):76-78

湖北省平原湖区的排水工程基本上是在20世纪50～60年代修建的，大部分排水涵闸工程处于不同程度地老化状态，致使工程效益下降。为了摸清涵闸老化病害程度，为湖北省平原湖区的涵闸改造规划提供建议，在对湖北省平原湖区现有涵闸工程老化损害情况进行全面调查的基础上，建立平原湖区主要涵闸的老化评价指标体系，运用层次分析法建立涵闸的老化评估模型，对湖北省平原湖区的涵闸进行老化病害评估分析。  相似文献   

汉江中下游宜城至沙洋段防洪调度     

吴瑕  关洪林c=h 《中国农村水利水电》2007,(4):35-37

通过对汉江中下游宜城至沙洋段的防洪形势分析，在确定出沙洋超额洪量、推荐分洪的民垸及各民垸的分洪时间的基础上，初步拟定汉江中下游宜城至沙洋段的防洪调度方案，汉江中下游宜城至沙洋段的防洪调度提供技术支持。  相似文献   

城市堤防设施运行管理系统设计探     

田爱平  方正杰梁海c 《中国农村水利水电》2006,(11):64-64

按照条块结合，以块为主的防汛责任制要求，结合城市网格化管理模式，通过堤防巡查人员或网格监督员对堤防设施进行不间断检查，及时发现情况并通过网格化管理平台流转到市堤防（泵闸）设施管理处，经相关系统联合快速分层处理，达到消除防汛隐患，确保河道堤防的安全运行。  相似文献   

深圳市水资源承载能力分析及对策     

/hi.ss.la/c 《中国农村水利水电》2006,(8):38-39

针对深圳市严重缺水的状况提出开展水资源承载能力研究的必要性，并运用区域水资源规划管理理论以及大系统多目标分析理论，构建了水资源承载力多目标分析模型，计算深圳市2010、2020年的水资源承载力，提出了深圳市提高水资源承载力的对策.  相似文献