Failure mode and effects analysis （FMEA） offers a quick and easy way for identifying ranking-order for all failure modes in a system or a product. In FMEA the ranking methods is so called risk priority number （RPN...Failure mode and effects analysis （FMEA） offers a quick and easy way for identifying ranking-order for all failure modes in a system or a product. In FMEA the ranking methods is so called risk priority number （RPN）, which is a mathematical product of severity （S）, occurrence （0）, and detection （D）. One of major disadvantages of this ranking-order is that the failure mode with different combination of SODs may generate same RPN resulting in difficult decision-making. Another shortfall of FMEA is lacking of discerning contribution factors, which lead to insufficient information about scaling of improving effort. Through data envelopment analysis （DEA） technique and its extension, the proposed approach evolves the current rankings for failure modes by exclusively investigating SOD in lieu of RPN and to furnish with improving sca.les for SOD. The purpose of present study is to propose a state-of-the-art new approach to enhance assessment capabilities of failure mode and effects analysis （FMEA）. The paper proposes a state-of-the-art new approach, robust, structured and useful in practice, for failure analysis.展开更多
The deep rock mass within coal mines situated in a challenging environment are characterized by high ground stress,high geotemperature,high osmotic water pressure,and dynamic disturbances from mechanical excavation.To...The deep rock mass within coal mines situated in a challenging environment are characterized by high ground stress,high geotemperature,high osmotic water pressure,and dynamic disturbances from mechanical excavation.To investigate the impact of this complex mechanical environment on the dynamic characteristics of roof sandstone in self-formed roadways without coal pillars,standard specimens of deep sandstone from the 2611 upper tunnel working face of the Yongmei Company within the Henan Coal Chemical Industry Group in Henan,China were prepared,and an orthogonal test was designed.Using a self-developed geotechnical dynamic impact mechanics test system,triaxial dynamic impact tests under thermal-hydraulicmechanical coupling conditions were conducted on deep sandstone.The results indicate that under high confining pressure,deep sandstone exhibits pronounced brittle failure at low temperatures,with peak strength gradually decreasing as temperature and osmotic water pressure increase.Conversely,under low confining pressure and low temperature,the brittleness of deep sandstone weakens gradually,while ductility increases.Moreover,sandstone demonstrates higher peak strength at low temperatures under high axial pressure conditions,lower peak strength at high temperatures,and greater strain under low axial pressure and high osmotic water pressure.Increases in impact air pressure and osmotic water pressure have proportionally greater effects on peak stress and peak strain.Approximately 50%of the input strain energy is utilized as effective energy driving the sandstone fracture process.Polar analysis identifies the optimal combination of factors affecting the peak stress and peak strain of sandstone.Under the coupling effect,intergranular and transgranular fractures occur within the sandstone.SEM images illustrate that the damage forms range from minor damage with multiple fissures to extensive fractures and severe fragmentation.This study elucidates the varied dynamic impact mechanical properties of deep sandstones under thermal-hydraulic-mechanical coupling,along with multifactor analysis methods and their optimal factor combinations.展开更多
Reliability allocation of computerized numerical controlled（CNC）lathes is very important in industry.Traditional allocation methods only focus on high-failure rate components rather than moderate failure rate compon...Reliability allocation of computerized numerical controlled（CNC）lathes is very important in industry.Traditional allocation methods only focus on high-failure rate components rather than moderate failure rate components,which is not applicable in some conditions.Aiming at solving the problem of CNC lathes reliability allocating,a comprehensive reliability allocation method based on cubic transformed functions of failure modes and effects analysis（FMEA）is presented.Firstly,conventional reliability allocation methods are introduced.Then the limitations of direct combination of comprehensive allocation method with the exponential transformed FMEA method are investigated.Subsequently,a cubic transformed function is established in order to overcome these limitations.Properties of the new transformed functions are discussed by considering the failure severity and the failure occurrence.Designers can choose appropriate transform amplitudes according to their requirements.Finally,a CNC lathe and a spindle system are used as an example to verify the new allocation method.Seven criteria are considered to compare the results of the new method with traditional methods.The allocation results indicate that the new method is more flexible than traditional methods.By employing the new cubic transformed function,the method covers a wider range of problems in CNC reliability allocation without losing the advantages of traditional methods.展开更多
针对传统故障模式和影响分析(failure mode and effect analysis,FMEA)方法存在评价使用精确数量化造成专家风险评估信息的丢失、忽略风险指标之间的相对重要性以及由于专家有限理性导致的评价固有的随机性等问题,利用区间值直觉模糊集...针对传统故障模式和影响分析(failure mode and effect analysis,FMEA)方法存在评价使用精确数量化造成专家风险评估信息的丢失、忽略风险指标之间的相对重要性以及由于专家有限理性导致的评价固有的随机性等问题,利用区间值直觉模糊集和云模型构建了一种改进的FMEA风险评估方法。首先,引入区间值直觉模糊集(IVIFS)来描述专家评价信息的复杂性和不确定性,通过运用区间值直觉模糊熵,计算专家权重和风险因子的权重;其次,采用云模型的方法,通过比较各支持云模型和反对云模型与正、负理想云模型的正、负相似度,获得故障模式评价值的综合相似度,通过对综合相似度大小排序得到各故障模式风险排序;最后,以自动扶梯的梯级、踏板和胶带风险评估为例进行分析,验证该评估方法的实用性和可行性。展开更多
提出一种改进失效模式与影响分析(Failure Mode and Effect Analysis,FMEA)模型用于智能制造系统可靠性风险评估。首先基于文献法、专家访谈和鱼骨图分析法,从人、机、料、法、环(Human-Machine-Material-Method-Environment,4M1E)五个...提出一种改进失效模式与影响分析(Failure Mode and Effect Analysis,FMEA)模型用于智能制造系统可靠性风险评估。首先基于文献法、专家访谈和鱼骨图分析法,从人、机、料、法、环(Human-Machine-Material-Method-Environment,4M1E)五个方面识别智能制造运行过程中的潜在失效模式;其次使用三角模糊数获取专家对失效模式的风险评估信息,风险因子权重由结构熵权法计算确定;最后运用模糊C均值(Fuzzy C-Means,FCM)算法划分失效模式的风险等级。此外,为了检验结果的有效性和可靠性,采用对比分析和蒙特卡洛仿真进行验证。展开更多
目的观察失效模式与效应分析(Failure mode and effect analysis,FMEA)模式下构建急诊危重症患者临床护理路径管理的效果。方法淮安市第一人民医院于2019年1月开始施行FMEA模式下构建急诊危重症患者临床护理路径管理(简称FMEA临床路径)...目的观察失效模式与效应分析(Failure mode and effect analysis,FMEA)模式下构建急诊危重症患者临床护理路径管理的效果。方法淮安市第一人民医院于2019年1月开始施行FMEA模式下构建急诊危重症患者临床护理路径管理(简称FMEA临床路径),利用回顾性分析方法收集2018年1月-2018年12月就诊本院的急诊危重症患者82例(对照组),利用倾向性评分匹配法在2019年2月-2020年6月就诊患者中选择与对照组具有相同性别、年龄、急性生理和慢性健康评分(APACHEⅡ)、发病至入院时间、疾病类别的急诊危重症患者82例(观察组),两组匹配比例为1∶1,用于确定FMEA临床路径前后患者的抢救室滞留时间、抢救时间、住院时间、危重症交接时间、抢救成功率、转运相关不良事件发生情况、并发症控制情况差异。结果观察组患者抢救室滞留时间、抢救时间、危重症交接时间,转运期间血压下降、呼吸骤停、心搏骤停、管道脱落/堵塞、药品物品不齐、交接不清、转运延迟以及压疮、下肢深静脉血栓、跌倒发生率及并发症总发生率均低于对照组(P<0.05);观察组患者抢救成功率为95.12%(78/82),高于对照组抢救成功率(P<0.05);观察组健康教育完成度评分高于对照组,差异有统计学意义(P<0.05)。结论FMEA模式下构建急诊危重症患者临床护理路径管理方案能够有效降低抢救室滞留时间、抢救时间、危重症交接时间、转运期间风险事件及抢救后压疮、下肢深静脉血栓、跌倒并发症风险,有效提升抢救成功率,有助于提升护理人员健康教育完成度。展开更多
The failure modes and effects analysis （FMEA） is widely applied in manufacturing industries in various phases of the product life cycle to evaluate the system, its design and processes for failures that can occur. T...The failure modes and effects analysis （FMEA） is widely applied in manufacturing industries in various phases of the product life cycle to evaluate the system, its design and processes for failures that can occur. The FMEA team often demonstrates different opinions and these different types of opinions are very difficult to incorporate into the FMEA by the traditional risk priority number model. In this paper, for each of the Occurrence, Severity and Detectivity parameters a fuzzy set is defined and the opinion of each FMEA team members is considered. These opinions are considered simultaneously with weights that are given to each individual based on their skills and experience levels. In addition, the opinion of the costumer is considered for each of the FMEA parameters. Then, the Risk Priority Numbers （RPN） is calculated using a Multi Input Single Output （MISO） fuzzy expert system. The proposed model is applied for prioritizing the failures of Peugeot 206 Engine assembly line in IKCo （Iran Khodro Company）.展开更多
目的探讨针对重型颅脑损患者群体,通过应用失效模式与效应分析(failure mode and effect analysis,FMEA)模型的预防性管理,观察其术后肺部感染发生率、控制率等临床应用效果。方法选取2021年2月至2022年12月住院的68例重型颅脑损伤患者...目的探讨针对重型颅脑损患者群体,通过应用失效模式与效应分析(failure mode and effect analysis,FMEA)模型的预防性管理,观察其术后肺部感染发生率、控制率等临床应用效果。方法选取2021年2月至2022年12月住院的68例重型颅脑损伤患者,将其随机分为试验组和对照组,每组34例。试验组患者采用FMEA模型的预防性管理,通过探讨导致肺部感染的高风险因素,逐一分析,查找原因,找出所有潜在感染隐患,进行干预管理。对照组患者采用颅脑手术患者的常规管理模式,比较2组患者术后肺部感染率、感染控制率、炎性指标、呼吸功能指标、ICU住院时间、总住院时间及住院满意率。结果分别应用FMEA模式和传统模式管理后,试验组患者肺部感染率低于对照组,感染控制率高于对照组,白细胞(WBC)、C-反应蛋白(CPR)数值低于对照组,血酸碱度(pH值)、动脉血氧饱和度(SaO_(2))数值高于对照组,氧合指数(P/F)、动脉血二氧化碳分压(PaCO_(2))数值低于对照组,ICU观察时间(天数)、总住院时间(天数)均少于对照组,患者住院满意度结果高于对照组,差异有统计学意义(P<0.05)。结论通过应用FMEA模型对重型颅脑损伤患者进行术后肺部感染的预防性管理,降低了患者肺部感染率,提高了患者肺部感染控制率,炎性指标及呼吸功能得到改善,并且缩短了住院时间,患者满意度得到提高,有推广和应用价值。展开更多
Reinforced concrete(RC)structures are generally designed to carry quasi-static gravity loads through almost indispensable components namely slab,however,it may be subjected to high intense loads induced from the impac...Reinforced concrete(RC)structures are generally designed to carry quasi-static gravity loads through almost indispensable components namely slab,however,it may be subjected to high intense loads induced from the impact of projectiles generated by the tornado,falling construction equipment,and also from accidental explosions during their construction and service lifespan.Impacts due to rock/boulder falls do occur on the structures located especially in hilly areas.Such loadings are not predictable but may cause severe damage to the slab/structure.It stimulates structural engineers and researchers to investigate and understand the dynamic response of RC structures under such impulsive loading.This research work first investigates the performance of 1000×1000×75 mm^(3)conventionally reinforced two-way spanning normal strength concrete slab with only tension reinforcement(0.88%)under the concentric impact load(1035 N)using the finite element method based computer code,ABAQUS/Explicit-v.6.15.The impact load is delivered to the centroid of the slab using a solid-steel cylindroconical impactor(drop weight)with a flat nose of diameter 40 mm,having a total mass of 105 kg released from a fixed height of 2500 mm.Two popular concrete constitutive models in ABAQUS namely;Holmquist-Johnson-Cook(HJC)and Concrete Damage Plasticity(CDP),with strain rate effects as per fib MODEL CODE 2010,are used to model the concrete material behavior to impact loading and to simulate the damage to the slab.The slab response using these two models is analyzed and compared with the impact test results.The strain rate effect on the reinforcing steel bars has been incorporated in the analysis using the Malvar and Crawford(1998)approach.A classical elastoplastic kinematic idealization is considered to model the steel impactor and support system.Results reveal that the HJC model gives a little overestimation of peak displacement,maximum acceleration,and damage of the slab while the predictions given by the CDP model are in reasonable agreement with the experimental test results/observations available in the open literature.Following the validation of the numerical model,analyses have been extended to further investigate the damage response of the slab under eccentric impact loadings.In addition to the concentric location(P1)of the impacting device,five locations on a quarter of the slab i.e.,two along the diagonal(P2&P3),the other two along the mid-span(P4&P5),and the last one(P6)between P3 and P5,covering the entire slab,are considered.Computational results have been discussed and compared,and the evaluation of the most damaging location(s)of the impact is investigated.It has been found that the most critical location of the impact is not the centroid of the slab but the eccentric one with the eccentricity of 1/6th of the span from the centroid along the mid-span section.展开更多
为积极响应《制造强国2025》“创新驱动、质量优先、绿色发展、结构优化、人才为本”的基本方针,采用一种风险评估技术——FMEA(Failure Mode and Effects Analysis),通过失效模式和影响分析,实现对设备的精确管控,促进企业提升产品和...为积极响应《制造强国2025》“创新驱动、质量优先、绿色发展、结构优化、人才为本”的基本方针,采用一种风险评估技术——FMEA(Failure Mode and Effects Analysis),通过失效模式和影响分析,实现对设备的精确管控,促进企业提升产品和服务质量。介绍了FMEA在济南卷烟厂设备管控和设计中的两个应用案例,包括FMEA因子的导入、表格制作及FMEA结果的应用三个方面。结果表明,探索建立的标准化失效模式和影响分析流程,在降低设备故障率、研发新型检测系统、提高设备工艺水平方面成效显著。这种标准化的流程为实现对设备的精确管控奠定了基础。展开更多
文摘Failure mode and effects analysis （FMEA） offers a quick and easy way for identifying ranking-order for all failure modes in a system or a product. In FMEA the ranking methods is so called risk priority number （RPN）, which is a mathematical product of severity （S）, occurrence （0）, and detection （D）. One of major disadvantages of this ranking-order is that the failure mode with different combination of SODs may generate same RPN resulting in difficult decision-making. Another shortfall of FMEA is lacking of discerning contribution factors, which lead to insufficient information about scaling of improving effort. Through data envelopment analysis （DEA） technique and its extension, the proposed approach evolves the current rankings for failure modes by exclusively investigating SOD in lieu of RPN and to furnish with improving sca.les for SOD. The purpose of present study is to propose a state-of-the-art new approach to enhance assessment capabilities of failure mode and effects analysis （FMEA）. The paper proposes a state-of-the-art new approach, robust, structured and useful in practice, for failure analysis.
基金supported by the Science and Technology Commissioner Project of Zhejiang Province(2023ST04)the supporting funds for scientific research launch of Zhejiang University of Science and Technology(F701104M11).
文摘The deep rock mass within coal mines situated in a challenging environment are characterized by high ground stress,high geotemperature,high osmotic water pressure,and dynamic disturbances from mechanical excavation.To investigate the impact of this complex mechanical environment on the dynamic characteristics of roof sandstone in self-formed roadways without coal pillars,standard specimens of deep sandstone from the 2611 upper tunnel working face of the Yongmei Company within the Henan Coal Chemical Industry Group in Henan,China were prepared,and an orthogonal test was designed.Using a self-developed geotechnical dynamic impact mechanics test system,triaxial dynamic impact tests under thermal-hydraulicmechanical coupling conditions were conducted on deep sandstone.The results indicate that under high confining pressure,deep sandstone exhibits pronounced brittle failure at low temperatures,with peak strength gradually decreasing as temperature and osmotic water pressure increase.Conversely,under low confining pressure and low temperature,the brittleness of deep sandstone weakens gradually,while ductility increases.Moreover,sandstone demonstrates higher peak strength at low temperatures under high axial pressure conditions,lower peak strength at high temperatures,and greater strain under low axial pressure and high osmotic water pressure.Increases in impact air pressure and osmotic water pressure have proportionally greater effects on peak stress and peak strain.Approximately 50%of the input strain energy is utilized as effective energy driving the sandstone fracture process.Polar analysis identifies the optimal combination of factors affecting the peak stress and peak strain of sandstone.Under the coupling effect,intergranular and transgranular fractures occur within the sandstone.SEM images illustrate that the damage forms range from minor damage with multiple fissures to extensive fractures and severe fragmentation.This study elucidates the varied dynamic impact mechanical properties of deep sandstones under thermal-hydraulic-mechanical coupling,along with multifactor analysis methods and their optimal factor combinations.
基金Supported by National Natural Science Foundation of China(Grant Nos.51135003,51205050,U1234208)Key National Science & Technology Special Project on"High-Grade CNC Machine Tools and Basic Manufacturing Equipments"(Grant No.2013ZX04011011)+1 种基金Research Fund for the Doctoral Program of Higher Education of China(Grant No.20110042120020)Fundamental Research Funds for the Central
文摘Reliability allocation of computerized numerical controlled（CNC）lathes is very important in industry.Traditional allocation methods only focus on high-failure rate components rather than moderate failure rate components,which is not applicable in some conditions.Aiming at solving the problem of CNC lathes reliability allocating,a comprehensive reliability allocation method based on cubic transformed functions of failure modes and effects analysis（FMEA）is presented.Firstly,conventional reliability allocation methods are introduced.Then the limitations of direct combination of comprehensive allocation method with the exponential transformed FMEA method are investigated.Subsequently,a cubic transformed function is established in order to overcome these limitations.Properties of the new transformed functions are discussed by considering the failure severity and the failure occurrence.Designers can choose appropriate transform amplitudes according to their requirements.Finally,a CNC lathe and a spindle system are used as an example to verify the new allocation method.Seven criteria are considered to compare the results of the new method with traditional methods.The allocation results indicate that the new method is more flexible than traditional methods.By employing the new cubic transformed function,the method covers a wider range of problems in CNC reliability allocation without losing the advantages of traditional methods.
文摘针对传统故障模式和影响分析(failure mode and effect analysis,FMEA)方法存在评价使用精确数量化造成专家风险评估信息的丢失、忽略风险指标之间的相对重要性以及由于专家有限理性导致的评价固有的随机性等问题,利用区间值直觉模糊集和云模型构建了一种改进的FMEA风险评估方法。首先,引入区间值直觉模糊集(IVIFS)来描述专家评价信息的复杂性和不确定性,通过运用区间值直觉模糊熵,计算专家权重和风险因子的权重;其次,采用云模型的方法,通过比较各支持云模型和反对云模型与正、负理想云模型的正、负相似度,获得故障模式评价值的综合相似度,通过对综合相似度大小排序得到各故障模式风险排序;最后,以自动扶梯的梯级、踏板和胶带风险评估为例进行分析,验证该评估方法的实用性和可行性。
文摘目的观察失效模式与效应分析(Failure mode and effect analysis,FMEA)模式下构建急诊危重症患者临床护理路径管理的效果。方法淮安市第一人民医院于2019年1月开始施行FMEA模式下构建急诊危重症患者临床护理路径管理(简称FMEA临床路径),利用回顾性分析方法收集2018年1月-2018年12月就诊本院的急诊危重症患者82例(对照组),利用倾向性评分匹配法在2019年2月-2020年6月就诊患者中选择与对照组具有相同性别、年龄、急性生理和慢性健康评分(APACHEⅡ)、发病至入院时间、疾病类别的急诊危重症患者82例(观察组),两组匹配比例为1∶1,用于确定FMEA临床路径前后患者的抢救室滞留时间、抢救时间、住院时间、危重症交接时间、抢救成功率、转运相关不良事件发生情况、并发症控制情况差异。结果观察组患者抢救室滞留时间、抢救时间、危重症交接时间,转运期间血压下降、呼吸骤停、心搏骤停、管道脱落/堵塞、药品物品不齐、交接不清、转运延迟以及压疮、下肢深静脉血栓、跌倒发生率及并发症总发生率均低于对照组(P<0.05);观察组患者抢救成功率为95.12%(78/82),高于对照组抢救成功率(P<0.05);观察组健康教育完成度评分高于对照组,差异有统计学意义(P<0.05)。结论FMEA模式下构建急诊危重症患者临床护理路径管理方案能够有效降低抢救室滞留时间、抢救时间、危重症交接时间、转运期间风险事件及抢救后压疮、下肢深静脉血栓、跌倒并发症风险,有效提升抢救成功率,有助于提升护理人员健康教育完成度。
文摘The failure modes and effects analysis （FMEA） is widely applied in manufacturing industries in various phases of the product life cycle to evaluate the system, its design and processes for failures that can occur. The FMEA team often demonstrates different opinions and these different types of opinions are very difficult to incorporate into the FMEA by the traditional risk priority number model. In this paper, for each of the Occurrence, Severity and Detectivity parameters a fuzzy set is defined and the opinion of each FMEA team members is considered. These opinions are considered simultaneously with weights that are given to each individual based on their skills and experience levels. In addition, the opinion of the costumer is considered for each of the FMEA parameters. Then, the Risk Priority Numbers （RPN） is calculated using a Multi Input Single Output （MISO） fuzzy expert system. The proposed model is applied for prioritizing the failures of Peugeot 206 Engine assembly line in IKCo （Iran Khodro Company）.
文摘目的探讨针对重型颅脑损患者群体,通过应用失效模式与效应分析(failure mode and effect analysis,FMEA)模型的预防性管理,观察其术后肺部感染发生率、控制率等临床应用效果。方法选取2021年2月至2022年12月住院的68例重型颅脑损伤患者,将其随机分为试验组和对照组,每组34例。试验组患者采用FMEA模型的预防性管理,通过探讨导致肺部感染的高风险因素,逐一分析,查找原因,找出所有潜在感染隐患,进行干预管理。对照组患者采用颅脑手术患者的常规管理模式,比较2组患者术后肺部感染率、感染控制率、炎性指标、呼吸功能指标、ICU住院时间、总住院时间及住院满意率。结果分别应用FMEA模式和传统模式管理后,试验组患者肺部感染率低于对照组,感染控制率高于对照组,白细胞(WBC)、C-反应蛋白(CPR)数值低于对照组,血酸碱度(pH值)、动脉血氧饱和度(SaO_(2))数值高于对照组,氧合指数(P/F)、动脉血二氧化碳分压(PaCO_(2))数值低于对照组,ICU观察时间(天数)、总住院时间(天数)均少于对照组,患者住院满意度结果高于对照组,差异有统计学意义(P<0.05)。结论通过应用FMEA模型对重型颅脑损伤患者进行术后肺部感染的预防性管理,降低了患者肺部感染率,提高了患者肺部感染控制率,炎性指标及呼吸功能得到改善,并且缩短了住院时间,患者满意度得到提高,有推广和应用价值。
文摘Reinforced concrete(RC)structures are generally designed to carry quasi-static gravity loads through almost indispensable components namely slab,however,it may be subjected to high intense loads induced from the impact of projectiles generated by the tornado,falling construction equipment,and also from accidental explosions during their construction and service lifespan.Impacts due to rock/boulder falls do occur on the structures located especially in hilly areas.Such loadings are not predictable but may cause severe damage to the slab/structure.It stimulates structural engineers and researchers to investigate and understand the dynamic response of RC structures under such impulsive loading.This research work first investigates the performance of 1000×1000×75 mm^(3)conventionally reinforced two-way spanning normal strength concrete slab with only tension reinforcement(0.88%)under the concentric impact load(1035 N)using the finite element method based computer code,ABAQUS/Explicit-v.6.15.The impact load is delivered to the centroid of the slab using a solid-steel cylindroconical impactor(drop weight)with a flat nose of diameter 40 mm,having a total mass of 105 kg released from a fixed height of 2500 mm.Two popular concrete constitutive models in ABAQUS namely;Holmquist-Johnson-Cook(HJC)and Concrete Damage Plasticity(CDP),with strain rate effects as per fib MODEL CODE 2010,are used to model the concrete material behavior to impact loading and to simulate the damage to the slab.The slab response using these two models is analyzed and compared with the impact test results.The strain rate effect on the reinforcing steel bars has been incorporated in the analysis using the Malvar and Crawford(1998)approach.A classical elastoplastic kinematic idealization is considered to model the steel impactor and support system.Results reveal that the HJC model gives a little overestimation of peak displacement,maximum acceleration,and damage of the slab while the predictions given by the CDP model are in reasonable agreement with the experimental test results/observations available in the open literature.Following the validation of the numerical model,analyses have been extended to further investigate the damage response of the slab under eccentric impact loadings.In addition to the concentric location(P1)of the impacting device,five locations on a quarter of the slab i.e.,two along the diagonal(P2&P3),the other two along the mid-span(P4&P5),and the last one(P6)between P3 and P5,covering the entire slab,are considered.Computational results have been discussed and compared,and the evaluation of the most damaging location(s)of the impact is investigated.It has been found that the most critical location of the impact is not the centroid of the slab but the eccentric one with the eccentricity of 1/6th of the span from the centroid along the mid-span section.
文摘为积极响应《制造强国2025》“创新驱动、质量优先、绿色发展、结构优化、人才为本”的基本方针,采用一种风险评估技术——FMEA(Failure Mode and Effects Analysis),通过失效模式和影响分析,实现对设备的精确管控,促进企业提升产品和服务质量。介绍了FMEA在济南卷烟厂设备管控和设计中的两个应用案例,包括FMEA因子的导入、表格制作及FMEA结果的应用三个方面。结果表明,探索建立的标准化失效模式和影响分析流程,在降低设备故障率、研发新型检测系统、提高设备工艺水平方面成效显著。这种标准化的流程为实现对设备的精确管控奠定了基础。
