One promising joining method for NiTi-SMA （shape memory alloy）-components is laser welding. This joining technology bears huge potential regarding process automation and mechanical properties as well as durability, ...One promising joining method for NiTi-SMA （shape memory alloy）-components is laser welding. This joining technology bears huge potential regarding process automation and mechanical properties as well as durability, especially within the field of small- and medium-sized actuators. However, there is still need for research due to unsolved issues influencing the microstructure and thus effecting mechanical properties as well as SMA-characteristics of these joints. Therefore, the purpose of this paper is the evaluation of quality parameters of NiTi-NiTi-wire-joints. For this purpose, design of experiments with a fractional factorial design is used for the investigation, because of its high potential to decrease experimental effort. This paper provides a basis for future research in the field of SMA-actuators and joining.展开更多
This work presents the design and control of the DAB （dual active bridge） converter employing gyrator＇s theory. A brief summary of the theory is introduced, and its application for the DAB converter is verified wit...This work presents the design and control of the DAB （dual active bridge） converter employing gyrator＇s theory. A brief summary of the theory is introduced, and its application for the DAB converter is verified with a design example. After that, it develops the control and show results of simulations and experiment. Though the commutation not is studied, the advantage of method is the easy way for project and control of the DAB converter.展开更多
文摘One promising joining method for NiTi-SMA （shape memory alloy）-components is laser welding. This joining technology bears huge potential regarding process automation and mechanical properties as well as durability, especially within the field of small- and medium-sized actuators. However, there is still need for research due to unsolved issues influencing the microstructure and thus effecting mechanical properties as well as SMA-characteristics of these joints. Therefore, the purpose of this paper is the evaluation of quality parameters of NiTi-NiTi-wire-joints. For this purpose, design of experiments with a fractional factorial design is used for the investigation, because of its high potential to decrease experimental effort. This paper provides a basis for future research in the field of SMA-actuators and joining.
文摘This work presents the design and control of the DAB （dual active bridge） converter employing gyrator＇s theory. A brief summary of the theory is introduced, and its application for the DAB converter is verified with a design example. After that, it develops the control and show results of simulations and experiment. Though the commutation not is studied, the advantage of method is the easy way for project and control of the DAB converter.
