Four-dimensional(4D)printing is an advanced form of three-dimensional(3D)printing with controllable and programmable shape transformation over time.Actuators are used as a controlling factor with multi-stage shape rec...Four-dimensional(4D)printing is an advanced form of three-dimensional(3D)printing with controllable and programmable shape transformation over time.Actuators are used as a controlling factor with multi-stage shape recovery,with emerging opportunities to customize the mechanical properties of bio-inspired structures.The print pattern of shape memory polymer(SMP)fbers strongly afects the achievable resolution,and consequently infuences several other physical and mechanical properties of fabricated actuators.However,the deformations of bio-inspired structures due to actuator layout are more complex because of the presence of the coupling of multi-directional strain.In this study,the initial structure was designed from closed-shell behavior and divided into a general unit and actuator unit,the latter responsible for driving the transformation.Mutual stress confrontation between the actuator and the general unit was considered in the layout thermodynamic model,in order to eliminate the transformation produced by the uncontrolled shape memory behavior of the general unit.Three critical and efective strategies for the layout design of actuators were proposed and then applied to achieve the desired accurate deformation of 3D-printed bilayer structures.Finally,the proposed approach was validated and adopted for fabricating a complex shell-like gripper structure.展开更多
针对申威众核处理器高功耗电源设计需求,提出采用脉冲宽度调制(Pulse Width Modulation,PWM)控制器、倍相器和Dr-MOS构建了1种高性能可扩展的电源拓扑结构。结合电源分配网络(Power Distribution Network,PDN)的目标阻抗获取以及多相均...针对申威众核处理器高功耗电源设计需求,提出采用脉冲宽度调制(Pulse Width Modulation,PWM)控制器、倍相器和Dr-MOS构建了1种高性能可扩展的电源拓扑结构。结合电源分配网络(Power Distribution Network,PDN)的目标阻抗获取以及多相均流控制方法,满足申威众核处理器核心电源对供电能力、电压精度、动态特性等的严格设计要求。同时,该电源拓扑结构可以根据不同目标负载大小灵活调整工作相数以适配不同功耗芯片的设计需求。该电源实验性能测试结果优异,运行稳定,取得了良好的技术效益。展开更多
基金the National Natural Science Foundation of China(Nos.51805472,51775489,and 51975386)the Natural Science Foundation of Zhejiang Province,China(No.LZ21E050004).
文摘Four-dimensional(4D)printing is an advanced form of three-dimensional(3D)printing with controllable and programmable shape transformation over time.Actuators are used as a controlling factor with multi-stage shape recovery,with emerging opportunities to customize the mechanical properties of bio-inspired structures.The print pattern of shape memory polymer(SMP)fbers strongly afects the achievable resolution,and consequently infuences several other physical and mechanical properties of fabricated actuators.However,the deformations of bio-inspired structures due to actuator layout are more complex because of the presence of the coupling of multi-directional strain.In this study,the initial structure was designed from closed-shell behavior and divided into a general unit and actuator unit,the latter responsible for driving the transformation.Mutual stress confrontation between the actuator and the general unit was considered in the layout thermodynamic model,in order to eliminate the transformation produced by the uncontrolled shape memory behavior of the general unit.Three critical and efective strategies for the layout design of actuators were proposed and then applied to achieve the desired accurate deformation of 3D-printed bilayer structures.Finally,the proposed approach was validated and adopted for fabricating a complex shell-like gripper structure.
文摘针对申威众核处理器高功耗电源设计需求,提出采用脉冲宽度调制(Pulse Width Modulation,PWM)控制器、倍相器和Dr-MOS构建了1种高性能可扩展的电源拓扑结构。结合电源分配网络(Power Distribution Network,PDN)的目标阻抗获取以及多相均流控制方法,满足申威众核处理器核心电源对供电能力、电压精度、动态特性等的严格设计要求。同时,该电源拓扑结构可以根据不同目标负载大小灵活调整工作相数以适配不同功耗芯片的设计需求。该电源实验性能测试结果优异,运行稳定,取得了良好的技术效益。
