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Lingyu Sun,Dingxin Leng,Juanjuan Sun,Yi Lin,Dengfeng Wang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
A tube is often applied as an energy absorber in structures subject to impact loads. However, when several tubes are combined to absorbenergy, how to arrange these tubes and match their dimensions has not been investigated. We provide a novel equivalent stiffness(ES) method for the initial design of tube-based energy absorbers, in which each tube is expressed by an equivalent spring with averagepost-buckling stiffness, and these springs are connected in series or parallel or hybrid. The plastic deformation and strain energy are distributedamong them according to their relative ES value. The relationship between plastic energy and post-buckling stiffness is derivedanalytically and verified numerically. Finally, an application example is provided and the optimal tube arrangement and dimensions areobtained by combining the proposed ES method with an optimization code. The results demonstrate that this method can provide aninitial design of tube-based energy absorbers efficiently.
( Lingyu Liu ),( Kang Seok Go ),( Nam Sun Nho ),( Kwang Ho Kim ),( Young-woo Rhee ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.1
The effect of dodecylbenzene sulfonic acid (DBSA) with different addition amount of DBSA (M<sub>DBSA</sub>), temperatures and solvent-to-oil ratio (SOR, v/v) on asphaltene aggregation in a solvent deasphalting system was investigated. Increasing the M<sub>DBSA</sub> at SOR 10 and 55℃ caused the asphaltene removal ratio (ARR) to increase first, then maximize at 1 wt% of M<sub>DBSA</sub> and then decrease continuously. Based on the SARA (saturate, aromatic, resin, asphaltene) composition, the adsorption amount of DBSA on the asphaltene surface and the self-aggregation of the DBSA, the reason for the change in ARR with M<sub>DBSA</sub> was found due to the adsorption mechanism. In addition, the asphaltene-resin-DBSA colloidal size confirmed the change of adsorption behavior between the asphaltene and DBSA. Based on the results of this study, a hypothetical adsorption mechanism of DBSA on asphaltene aggregation in the solvent deasphalting system was conceived of and proposed.
Design and analysis of multistage adaptive lateral deformation tracked robot
Yidong Bai,Lingyu Sun,Minglu Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
A multistage adaptive lateral deformation tracked robot is proposed based on module design. The mechanical structures of lateral and tracked deformations are established by analyzing the constraints of space barriers and the elastic potential energy change mechanism of internal storage. The interaction of the operating environment and the mechanism is analyzed during the deformation process, and the internal potential energy change mechanism is optimized using the NSGA-II algorithm. The dynamic model is established in RecurDyn software, and the main modules and their coupling relationships are analyzed. Finally, the robot prototype is fabricated, and the obstacle surmounting performance and deformation mode are verified through experimental tests. For small robots, it has the advantages of large load, long driving distance, strong obstacle surmounting ability, and stable steering on the slope, and for robots with the same size, it can increase or decrease its width, has stronger terrain passability and environmental adaptability, so that it can operate in different scenarios within the same mission.
Impact of Grafting Density on the Self-Assembly and Hydrophilicity of Succinylated Collagen
Wenxin Wang,Feiyi Shu,Lingyu Pan,Shanshan Huang,Xiao Tu,Ping Li,Siman Li,Yuanyuan Li,Chengzhi Xu,Yang Sun,Juntao Zhang,Haibo Wang 한국고분자학회 2020 Macromolecular Research Vol.28 No.6
Modification of protein could give their new functionality but would affect their intrinsic property and activity. In this paper, a series of succinylated collagen (SCol(n/1)) (n≥1) were prepared by modification of collagen with succinic anhydride at different molar ratio to amino groups amount of collagen. The impact of grafting density on the intrinsic self-assembly and additional hydrophilicity of succinylated collagen was explored. The results revealed that excessive grafting density of succinylated collagen would improve their hydrophilicity but weaken their self-assembly property, although the triple helix of collagen could be reserved after succinylation. SCol(1/1) (grafting density of 17%) with self-assembly property and good hydrophilicity was chosen to compare with native collagen. Compared to native collagen, thermostability of SCol(1/1) decreased slightly, however, SCol(1/1) could form softer hydrogel, which was more favorable for the proliferation of NIH/3 T3. The present work would help us to further understand the importance of grafting density for the design of modified collagen with intrinsic self-assembly property and additional new functionality.