Modeling of High-Speed Wheel–Rail Rolling Contact on a Corrugated Rail and Corrugation Development
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As one of the most fuel-efficient diesel locomotives in the world,HXN3diesel locomotive can track more wagons with less fuel and lower emission.But the substantial noise and of HXN3locomotive cab will provide less crew comfort,more equipment and manufacturing cost.The paper will analysis the vibration of the cab,and optimize the vibration isolation system.
Diesel locomotive
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering.A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent.The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature.With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased.When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100 varied ℃ from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa.With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100 increased.℃ While the sintering temperature increasing from 2050 to 2150 , ℃ the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.
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For the demolishing construction of a 3-span continuous box girder bridge with span arrangement(18+26.4+18) m,a demolishing scheme was proposed and designed,i.e.,the main girder of the bridge was stabilized by the bailey truss and suspenders,the girder was cut into 3 sections by the diamond steel wire cutting method,the section of the girder over the central span was lifted away by the overhead launching gantry and shifted to an open ground where it was then broken into pieces.The side spans flanking the central span and the 2-m remaining sections of the central span were broken in situ on staging.To ensure the construction safety,the internal force and deformation of the structure in the construction process were analyzed by the finite element software.The results of the analysis indicated that the deflection of the bailey truss was greater than that of the main girder,which caused great tensile force in the suspenders at both sides of the truss and little tensile force in the suspenders in the middle.In that case,the suspenders were pre-tensioned before lifting and in the lifting process,the axial forces of the suspenders were adjusted.Presently,the demolishing of the bridge has been completed and the whole process of the demolishing is safe and controllable.
Box girder
Internal forces
Bridge (graph theory)
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For this study,the installation process of the steel box girder of the main bridge of Xiazhang Sea-Crossing Bridge was taken as the background.The lifting points for installation were optimized through the finite element calculation of the steel box girder sections.Originally,there was a small number of lifting points and the problem of stress concentration also existed,after the optimization,a sound installation condition of multiple lifting points and good stress distribution were created.The natural vibration property of the sections of the steel box girder was studied to guide the application of the equipments which showed vibration during the construction process.The maximum stress near the derrick crane under the transient working condition was analyzed and calculated,so as to control the most unfavorable working stress during the construction process and ensure the safety of the construction.
Bridge (graph theory)
Box girder
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A simple microwave‐assisted aqueous solution strategy combined with a subsequent low‐temperature hydrogen reduction process was used to prepare Mo‐Cu nanopowders. In order to systematically investigate the densification behavior and properties of Mo‐Cu composites, the densification, microstructure, hardness, electrical conductivity, thermal conductivity, and bending strength of Mo‐Cu compacts were tested after sintering at different temperatures. Results show that the sintering temperature is a critical factor in the densification process of Mo‐Cu composites. The shrinkage rate, density, and hardness of sintered composites increase as the temperature rises. However, too high sintering temperature resulted in the decrease in electrical conductivity (EC), thermal conductivity (TC), and bending strength. By optimizing all the performance indicators, high‐performance Mo‐25 wt.% Cu composites with a homogeneous microstructure accompanied with good physical and mechanical properties could be successfully obtained by sintering for 2 h at 1200°C.
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Nanocrystalline material
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