按照国际海事组织(International Maritime Organization, IMO)对船舶结构冗余度的要求,基于加筋板损伤假定,提出一种邮轮甲板结构冗余度验证方法,包括邮轮甲板结构冗余度准则、损伤假定、载荷情形和非线性有限元分析等内容。采用该方...按照国际海事组织(International Maritime Organization, IMO)对船舶结构冗余度的要求,基于加筋板损伤假定,提出一种邮轮甲板结构冗余度验证方法,包括邮轮甲板结构冗余度准则、损伤假定、载荷情形和非线性有限元分析等内容。采用该方法对不同上层建筑参与度下极地邮轮甲板结构的冗余度进行验算。计算结果符合法国船级社《Rules for the Classification of Steel Ships》的加筋板屈曲失效准则,邮轮甲板结构能满足冗余度要求,即“任何加筋结构构件的局部损伤(如局部永久变形、断裂或焊缝失效)不会立即导致整个加筋板格垮塌”。该研究可供邮轮的结构冗余度设计参考。展开更多
In our daily lives,low-frequency kinetic energy primarily manifests as vibrations.However,effective harnessing of lowfrequency kinetic energy remains a formidable challenge.This paper proposes a rope-driven rotor that...In our daily lives,low-frequency kinetic energy primarily manifests as vibrations.However,effective harnessing of lowfrequency kinetic energy remains a formidable challenge.This paper proposes a rope-driven rotor that rotates around an axis and consists of an ultra-high-molecular-weight polyethylene(UHMWPE)wire wrapped around a metal shaft.The rotor can convert ultra-low frequency vibration/linear motion into rapid rotation by pressing the top at low frequencies and driving the rope for a quick release.The harvester can generate up to 36.25 m W power using a 0.1-mm-diameter UHMWPE wire as the rotor when periodically pressed down to 20 mm at a frequency of 1 Hz.A simple power generation floor is assembled,generating 28.58-m W power with a matching load at a frequency of 1.5 Hz.Moreover,the harvester can increase the charging voltage of a 0.47-F supercapacitor from 0 to 6.8 V within 10 min.In addition,the harvester can harvest energy through a light finger press motion,and the energy obtained can also support the continuous operation of multiple electronic devices concurrently.This study introduces an effective method for harvesting ultra-low frequency energy and has great prospects in the field of power generation floor and human movement energy harvesting.展开更多
文摘按照国际海事组织(International Maritime Organization, IMO)对船舶结构冗余度的要求,基于加筋板损伤假定,提出一种邮轮甲板结构冗余度验证方法,包括邮轮甲板结构冗余度准则、损伤假定、载荷情形和非线性有限元分析等内容。采用该方法对不同上层建筑参与度下极地邮轮甲板结构的冗余度进行验算。计算结果符合法国船级社《Rules for the Classification of Steel Ships》的加筋板屈曲失效准则,邮轮甲板结构能满足冗余度要求,即“任何加筋结构构件的局部损伤(如局部永久变形、断裂或焊缝失效)不会立即导致整个加筋板格垮塌”。该研究可供邮轮的结构冗余度设计参考。
基金supported by the National Natural Science Foundation of China(Grant Nos.62171414,U2341210,52175554,and 52205608)the Fundamental Research Program of Shanxi Province(Grant Nos.20210302123059,and 20210302124610)+1 种基金the Hebei Province Central Guiding Local Science and Technology Development Fund Project(Grant No.236Z4901G)the National Defense Fundamental Research Project。
文摘In our daily lives,low-frequency kinetic energy primarily manifests as vibrations.However,effective harnessing of lowfrequency kinetic energy remains a formidable challenge.This paper proposes a rope-driven rotor that rotates around an axis and consists of an ultra-high-molecular-weight polyethylene(UHMWPE)wire wrapped around a metal shaft.The rotor can convert ultra-low frequency vibration/linear motion into rapid rotation by pressing the top at low frequencies and driving the rope for a quick release.The harvester can generate up to 36.25 m W power using a 0.1-mm-diameter UHMWPE wire as the rotor when periodically pressed down to 20 mm at a frequency of 1 Hz.A simple power generation floor is assembled,generating 28.58-m W power with a matching load at a frequency of 1.5 Hz.Moreover,the harvester can increase the charging voltage of a 0.47-F supercapacitor from 0 to 6.8 V within 10 min.In addition,the harvester can harvest energy through a light finger press motion,and the energy obtained can also support the continuous operation of multiple electronic devices concurrently.This study introduces an effective method for harvesting ultra-low frequency energy and has great prospects in the field of power generation floor and human movement energy harvesting.
