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Intercalation Assembly Method and Intercalation Process Control of Layered Intercalated Functional Materials 被引量:5
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作者 李凯涛 王桂荣 +2 位作者 李殿卿 林彦军 段雪 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第4期453-462,共10页
Layered intercalated functional materials of layered double hydroxide type are an important class of functional materials developed in recent years. Based on long term studies on these materials in the State Key Labor... Layered intercalated functional materials of layered double hydroxide type are an important class of functional materials developed in recent years. Based on long term studies on these materials in the State Key Laboratory of Chemical Resource Engineering in Beiiing University of Chemical Technology, the orinciole for the design of controlled intercalation processes in the light of tuture production processing requirements has been developed. Intercalation assembly methods and technologies have been invented to control the intercalation process for preparing layered intercalated materials with various structures and functions. 展开更多
关键词 layered intercalated structure functional material intercalation assembly methods intercalation process
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Design methods of rhombic tensegrity structures 被引量:1
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作者 Xi-Qiao Feng Yue Li +2 位作者 Yan-Ping Cao Shou-Wen Yu Yuan-Tong Gu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2010年第4期559-565,共7页
As a special type of novel flexible structures, tensegrity holds promise for many potential applications in such fields as materials science, biomechanics, civil and aerospace engineering. Rhombic systems are an impor... As a special type of novel flexible structures, tensegrity holds promise for many potential applications in such fields as materials science, biomechanics, civil and aerospace engineering. Rhombic systems are an important class of tensegrity structures, in which each bar constitutes the longest diagonal of a rhombus of four strings. In this paper, we address the design methods of rhombic structures based on the idea that many tensegrity structures can be constructed by assembling one-bar elementary cells. By analyzing the properties of rhombic cells, we first develop two novel schemes, namely, direct enumeration scheme and cell-substitution scheme. In addition, a facile and efficient method is presented to integrate several rhombic systems into a larger tensegrity structure. To illustrate the applications of these methods, some novel rhombic tensegrity structures are constructed. 展开更多
关键词 Tensegrity Structural design Assembling method Flexible structure
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Design and Dynamic Analysis of the Recirculating Planetary Roller Screw Mechanism 被引量:1
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作者 Guan Qiao Rong Liao +2 位作者 Shijie Guo Zhenghong Shi Shangjun Ma 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2022年第4期240-255,共16页
The recirculating planetary roller screw mechanism(RPRSM)is a transmission mechanism that engages the screw and nut threaded by multiple grooved rollers.In this paper,frstly,the design method of RPRSM nut threadless a... The recirculating planetary roller screw mechanism(RPRSM)is a transmission mechanism that engages the screw and nut threaded by multiple grooved rollers.In this paper,frstly,the design method of RPRSM nut threadless area is proposed,and the equations related to the structural parameters of nut threadless area are derived.On this basis,the cross-section design method of roller,screw and nut is constructed according to the actual situation of engagements between the screw/nut and the roller.By adjusting the gap between the two beveled edges and that between the arc and the beveled edge,the accuracy of the thread engagements between the screw/nut and the roller can be improved.Secondly,to ensure the engagements of the screw/nut and the roller,the distance equation from the center surface of the diferent rollers to the end surface of cam ring is given.Thirdly,combined with the working principle and structural composition of RPRSM,the component model is established according to its relevant structural parameters,and the virtual assembly is completed.Finally,the 3D model is imported into the ADAMS simulation software for multi-rigid body dynamics.The dynamic characteristic is analyzed,and the simulated values are compared with the theoretical values.The results show that the contact forces between the screw/nut and the roller are sinusoidal,mainly due to the existence of a small gap between the roller and the carrier.The maximum collision forces between the roller and cam ring are independent from load magnitude.Normally,the collision force between the roller and the carrier increases as the load increases.When RPRSM is in the transmission process,the roller angular speed in nut threadless area begins to appear abruptly,and the position of the maximum change is at the contact between the roller and the convex platform of cam ring.The design of the nut threadless area and the proposed virtual assembly method can provide a theoretical guidance for RPRSM research,as well as a reference for overall performance optimization. 展开更多
关键词 Recirculating planetary roller screw mechanism Nut threadless area Virtual assembly method Motion relationship Dynamic analysis
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Enhancement of current density using effective membranes electrode assemblies for water electrolyser system 被引量:1
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作者 Swaminathan Seetharaman Subash Chandrabose Raghu Kambiz Ansari Mahabadi 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第1期77-84,共8页
The goal of this study was to develop and design a composite proton exchange membrane(PEM) and membrane electrode assembly(MEA) that are suitable for the PEM based water electrolysis system. In particular,it focus... The goal of this study was to develop and design a composite proton exchange membrane(PEM) and membrane electrode assembly(MEA) that are suitable for the PEM based water electrolysis system. In particular,it focuses on the development of sulphonated polyether ether ketone(SPEEK) based membranes and caesium salt of silico-tungstic acid(Cs Si WA) matrix compared with one of the transition metal oxides such as titanium dioxide(TiO2), silicon dioxide(SiO2) and zirconium dioxide(ZrO2). The resultant membranes have been characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, ion exchange capacity(IEC), water uptake and atomic force microscopy. Comparative studies on the performance of MEAs were also conducted utilizing impregnation-reduction and conventional brush coating methods. The PEM electrolysis performance of SPEEK-Cs Si WA-ZrO2 composite membrane was more superior than that of other membranes involved in this study. Electrochemical characterization shows that a maximum current density of 1.4 A/cm^2 was achieved at 60 °C, explained by an increased concentration of protonic sites available at the interface. 展开更多
关键词 Composite membrane Membrane electrode assembly Impregnation reduction method Brush coating method Electrolysis
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Error Analysis of Assembly Linkage of Transport Jig for Large Aircraft Parts
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作者 倪雁冰 潘琪 +1 位作者 郭雯侠 白永超 《Transactions of Tianjin University》 EI CAS 2013年第6期440-447,共8页
Aiming at the assembly accuracy of a large aircraft transport jig, the effect of component error and the error of work-piece surface on the work-piece position and orientation in the 3-2-1 fixturing scheme is studied ... Aiming at the assembly accuracy of a large aircraft transport jig, the effect of component error and the error of work-piece surface on the work-piece position and orientation in the 3-2-1 fixturing scheme is studied with the object pose space description method. The error mapping model between the connecting part of the front frame rack and its support base is modeled using the homogeneous transformation matrix(HTM) method. The probabilistic error is simulated using the Monte Carlo method. The measurement experiment was conducted by the laser tracker to verify the effectiveness of the approach, and the approach has been successfully applied to the production of transport jig. 展开更多
关键词 assembly linkage error modeling homogeneous transformation matrix Monte Carlo method
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