本文基于制造工艺原型的视角,提出一种面向增材制造(Design for Additive Manufacturing)的设计知识表征方法,为面向制造的设计(Design for Manufacturing)知识获取、存储、调用、共享提供参考,以熔融沉积制造(FDM)这一典型增材制造技...本文基于制造工艺原型的视角,提出一种面向增材制造(Design for Additive Manufacturing)的设计知识表征方法,为面向制造的设计(Design for Manufacturing)知识获取、存储、调用、共享提供参考,以熔融沉积制造(FDM)这一典型增材制造技术为例,构建基于制造工艺原型的DFAM知识库,并初步验证其合理性及可用性。展开更多
Although several research works in the literature have focused on studying the capabilities of additive manufacturing(AM) systems, few works have addressed the development of Design for Additive Manufacturing(DfAM) kn...Although several research works in the literature have focused on studying the capabilities of additive manufacturing(AM) systems, few works have addressed the development of Design for Additive Manufacturing(DfAM) knowledge,tools, rules, and methodologies, which has limited the penetration and impact of AM in industry. In this paper a comprehensive review of design and manufacturing strategies for Fused Deposition Modelling(FDM) is presented.Consequently, several DfAM strategies are proposed and analysed based on existing research works and the operation principles, materials, capabilities and limitations of the FDM process. These strategies have been divided into four main groups: geometry, quality, materials and sustainability. The implementation and practicality of the proposed DfAM is illustrated by three case studies. The new proposed DfAM strategies are intended to assist designers and manufacturers when making decisions to satisfy functional needs, while ensuring manufacturability in FDM systems.Moreover, many of these strategies can be applied or extended to other AM processes besides FDM.展开更多
液压系统是航天设备的主要动力组成,随着设备集成度越来越高,对液压系统轻量化、集成化提出了更高的要求。其中液压阀块是液压系统的重要组成元件,传统设计结构多以直孔交叉形式实现流道连通,导致设计局限大,工艺孔道多,生产加工困难,...液压系统是航天设备的主要动力组成,随着设备集成度越来越高,对液压系统轻量化、集成化提出了更高的要求。其中液压阀块是液压系统的重要组成元件,传统设计结构多以直孔交叉形式实现流道连通,导致设计局限大,工艺孔道多,生产加工困难,同时材料利用率低,浪费严重。采用面向增材制造(Design for Additive Manufacturing,DFAM)的设计思维,对液压阀块进行轻量化集成优化设计,通过取消工艺孔道、流道直通、自支撑设计、降低无效材料使用等手段,实现阀块高自由度、轻量化、集成化设计,并通过增材制造的方式实现,为航天设备拓展增材制造使用提供有益借鉴。展开更多
The development of personalized healthcare is rapidly growing thanks to the support of low-power electronics,advanced fabrication processes and secured data transmission protocols.Long-acting drug delivery systems abl...The development of personalized healthcare is rapidly growing thanks to the support of low-power electronics,advanced fabrication processes and secured data transmission protocols.Long-acting drug delivery systems able to sustain the release of therapeutics in a controllable manner can provide several advantages in the treatment of chronic diseases.Various systems under development control drug release from an implantable reservoir via concentration driven diffusion through nanofluidic membranes.Given the high drug concentration in the reservoir,an inward osmotic fluid transport occurs across the membrane,which counters the outward diffusion of drugs.The resulting osmotic pressure buildup may be sufficient to cause the failure of implants with associated risks to patients.Confidently assessing the osmotic pressure buildup requires testing in vivo.Here,using metal and polymer AM(additive manufacturing)processes,we designed and developed implantable drug reservoirs with embedded strain sensors to directly measure the osmotic pressure in drug delivery implants in vitro and in vivo.展开更多
In this work, the authors propose the study of a wind speed variable based on the DFAM （double fed asynchronous machine）. The model of the turbine is drawn from the classical equations describing the operation of a ...In this work, the authors propose the study of a wind speed variable based on the DFAM （double fed asynchronous machine）. The model of the turbine is drawn from the classical equations describing the operation of a variable wind speed. The torque generated by the turbine is applied to the DFAM directly connected on the network side and the stator via a bidirectional converter side rotor. This configuration allows velocity variations of ±30% around the synchronous speed and the converter is then sized to one third of the rated power of the machine. The DFAM is controlled by a control vector ensuring operation of the wind turbine power coefficient maximum.展开更多
文摘本文基于制造工艺原型的视角,提出一种面向增材制造(Design for Additive Manufacturing)的设计知识表征方法,为面向制造的设计(Design for Manufacturing)知识获取、存储、调用、共享提供参考,以熔融沉积制造(FDM)这一典型增材制造技术为例,构建基于制造工艺原型的DFAM知识库,并初步验证其合理性及可用性。
基金Supported by National Science and Technology Council(CONACYT)of Mexico(Grant No.CB-2010-01-154430)PROMEP Program of the Public Education Secretariat(SEP)of MexicoFund for Research Support(FAI)of UASLP
文摘Although several research works in the literature have focused on studying the capabilities of additive manufacturing(AM) systems, few works have addressed the development of Design for Additive Manufacturing(DfAM) knowledge,tools, rules, and methodologies, which has limited the penetration and impact of AM in industry. In this paper a comprehensive review of design and manufacturing strategies for Fused Deposition Modelling(FDM) is presented.Consequently, several DfAM strategies are proposed and analysed based on existing research works and the operation principles, materials, capabilities and limitations of the FDM process. These strategies have been divided into four main groups: geometry, quality, materials and sustainability. The implementation and practicality of the proposed DfAM is illustrated by three case studies. The new proposed DfAM strategies are intended to assist designers and manufacturers when making decisions to satisfy functional needs, while ensuring manufacturability in FDM systems.Moreover, many of these strategies can be applied or extended to other AM processes besides FDM.
文摘液压系统是航天设备的主要动力组成,随着设备集成度越来越高,对液压系统轻量化、集成化提出了更高的要求。其中液压阀块是液压系统的重要组成元件,传统设计结构多以直孔交叉形式实现流道连通,导致设计局限大,工艺孔道多,生产加工困难,同时材料利用率低,浪费严重。采用面向增材制造(Design for Additive Manufacturing,DFAM)的设计思维,对液压阀块进行轻量化集成优化设计,通过取消工艺孔道、流道直通、自支撑设计、降低无效材料使用等手段,实现阀块高自由度、轻量化、集成化设计,并通过增材制造的方式实现,为航天设备拓展增材制造使用提供有益借鉴。
文摘The development of personalized healthcare is rapidly growing thanks to the support of low-power electronics,advanced fabrication processes and secured data transmission protocols.Long-acting drug delivery systems able to sustain the release of therapeutics in a controllable manner can provide several advantages in the treatment of chronic diseases.Various systems under development control drug release from an implantable reservoir via concentration driven diffusion through nanofluidic membranes.Given the high drug concentration in the reservoir,an inward osmotic fluid transport occurs across the membrane,which counters the outward diffusion of drugs.The resulting osmotic pressure buildup may be sufficient to cause the failure of implants with associated risks to patients.Confidently assessing the osmotic pressure buildup requires testing in vivo.Here,using metal and polymer AM(additive manufacturing)processes,we designed and developed implantable drug reservoirs with embedded strain sensors to directly measure the osmotic pressure in drug delivery implants in vitro and in vivo.
文摘In this work, the authors propose the study of a wind speed variable based on the DFAM （double fed asynchronous machine）. The model of the turbine is drawn from the classical equations describing the operation of a variable wind speed. The torque generated by the turbine is applied to the DFAM directly connected on the network side and the stator via a bidirectional converter side rotor. This configuration allows velocity variations of ±30% around the synchronous speed and the converter is then sized to one third of the rated power of the machine. The DFAM is controlled by a control vector ensuring operation of the wind turbine power coefficient maximum.
