The Experts below are selected from a list of 843 Experts worldwide ranked by ideXlab platform
Ai-hua Liao - One of the best experts on this subject based on the ideXlab platform.
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Frictional Contact Problem Study on Compressor by a Parametric Quadratic Programming Method
Advanced Materials Research, 2012Co-Authors: Ai-hua LiaoAbstract:A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical analysis. The solution of elastoplastic frictional contact problems belongs to the unspecified boundary problems where the interaction between two kinds of nonlinearities should occur. To save the time cost in the numerical computation, multi-substructure technique was adopted in the structural modeling. The effect of fit tolerance, wall thickness of Shaft Sleeve and rotational speed on the contact stress was discussed in detail in the numerical computation. To decrease the difficulty of the assembling process and make sure the safety of the working state, the amount of interference between the Shaft Sleeve and Shaft by press-fitting should be controlled strictly to avoid the rapid increase of the contact stress. The numerical results show the high accuracy and good convergence of the algorithm presented here. The study play a referenced role in deciding the proper fit tolerance and improving design and manufacturing technology of compressor impellers.
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Elastoplastic Frictional Contact Study on Interference Fits of Compressor
Advanced Materials Research, 2011Co-Authors: Ai-hua LiaoAbstract:The FE parametric quadratic programming (PQP) method developed from the parametric variational principle (PVP) was used for the analysis of the stress distribution of the 3D elastoplastic frictional contact of an impeller-Shaft Sleeve-Shaft. A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical analysis. The solution of elastoplastic frictional contact problems belongs to unspecified boundary problems where the interaction between two kinds of nonlinearities should occur. To save time in the numerical computation, a multi-substructure technique was adopted in the structural modeling. The effect of fit tolerance, wall thickness of the Shaft Sleeve, and rotational speed on the contact stress was discussed in detail in the numerical computation. To decrease the difficulty of the assembly process and ensure the safety of the working state, the amount of interference between the Shaft Sleeve and Shaft by press-fitting should be controlled strictly to avoid the rapid increase of contact stress. The numerical results show that the algorithm has high accuracy and good convergence. The study can be referred to in deciding the proper fit tolerance and improving the design and manufacturing technology of compressor impellers.
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Frictional Contact Analysis of Turbocharger Compressor-Shaft Sleeve-Shaft
2009 International Conference on Measuring Technology and Mechatronics Automation, 2009Co-Authors: Ai-hua LiaoAbstract:The impeller mounted onto the compressor Shaft assembly via interference fit is one of the key components of a centrifugal compressor stage. The assembly creates a complicated frictional contact problem the interface of the mating parts when the rotational speed is high. So it is quite necessary to investigate the contact situation of compressor-Shaft Sleeve-Shaft for running safely. The FE parametric quadratic programming (PQP) method developed based on the parametric variational principle (PVP) is used for the analysis of stress distribution of 3D frictional contact of impeller-Shaft Sleeve-Shaft. The effects of coefficient of friction, the wall thickness of Shaft Sleeve, rotational speed and the contact stress distribution on the mating surfaces are discussed in the numerical computation. The numerical results can be referred to in deciding the proper fit tolerance and improving the design and manufacturing technology of compressor impellers.
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Elastoplastic frictional contact problem study on interference fits of compressor
Frontiers of Energy and Power Engineering in China, 2008Co-Authors: Hongwu Zhang, Ai-hua LiaoAbstract:The FE parametric quadratic programming (PQP) method developed from the parametric variational principle (PVP) was used for the analysis of the stress distribution of the 3D elastoplastic frictional contact of an impeller-Shaft Sleeve-Shaft. A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical analysis. The solution of elastoplastic frictional contact problems belongs to unspecified boundary problems where the interaction between two kinds of nonlinearities should occur. To save time in the numerical computation, a multi-substructure technique was adopted in the structural modeling. The effect of fit tolerance, wall thickness of the Shaft Sleeve, and rotational speed on the contact stress was discussed in detail in the numerical computation. To decrease the difficulty of the assembly process and ensure the safety of the working state, the amount of interference between the Shaft Sleeve and Shaft by press-fitting should be controlled strictly to avoid the rapid increase of contact stress. The numerical results show that the algorithm has high accuracy and good convergence. The study can be referred to in deciding the proper fit tolerance and improving the design and manufacturing technology of compressor impellers.
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A finite element model for 3D elastoplastic frictional contact analysis and its application in numerical simulation of turbocharger compressor
Mechanics Based Design of Structures and Machines, 2007Co-Authors: Ai-hua Liao, H. W. ZhangAbstract:The finite element parametric quadratic programming (PQP) method developed based on the parametric variational principle (PVP) is used for the analysis of stress distribution of 3D elastoplastic contact problems. Particular concentration is on the numerical analysis of the impeller-Shaft Sleeve-Shaft in a locomotive-type turbocompressor with 24 blades under combined centrifugal and interference-fit loading. The multi-level, multi-branch substructure technique of FE used takes precise simulation of complicated geometrical shapes of impeller and considerably enhances accuracy in numerical computation. The influence of fit tolerance, the wall thickness of Shaft Sleeve, rotational speed (centrifugal force) on contact stress distribution in the structure is discussed in detail. The results obtained provides an effective approach to achieve more reliable interference-fitting connections and more precise assembly with lower manufacturing cost in the structural design of turbocharger compressor.
Tianbiao Zhao - One of the best experts on this subject based on the ideXlab platform.
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optimization of Shaft seal water system of cutter suction dredger based on high efficiency centrifugal separation technology
Separation and Purification Technology, 2020Co-Authors: Xiaoxue Hu, Bingjie Wang, Ziqiang Hu, Xigang Yang, Tianbiao ZhaoAbstract:Abstract The Shaft-seal water system (SSWS), as one of the critical systems for slurry pump protection, is widely used to provide Shaft-seal water in cutter suction dredger. In general, the Shaft-seal water obtained from gravity clarifier always accompanies with numerous sand with large size (>10 μm), resulting in the inevitable intense wear of components in the slurry pump, especially, the Shaft Sleeve and L-shaped rubber ring in back Shaft seal. Even worse, the high temperature caused by unstable Shaft rotation in the present of sand will aggravate the degree of this wear. To address the above thorny problems, in this study, water-sealed hydrocyclone (WSH) was unprecedentedly applied to optimize SSWS for high-efficiency sand centrifugal separation. The dimension and structure of WSH were designed and optimized before final industrial application. High-efficiency separation zone (the separation efficiency >90%) with Re ranged of 1.88 × 104–2.23 × 104 was also confirmed by introducing the optimal structure of the WSH (5° of cone angle and 10 mm of bottom apex diameter). For the improved SSWS in the actual application, the Dv(50) of the Shaft-seal water decreased from 38.0 μm to 9.1 μm, and the corresponding solid concentration declined from 0.51 g/L to 0.051 g/L. Furthermore, it was verified that the optimized SSWS could significantly reduce the wear of the Shaft Sleeve and L-shaped rubber ring, and extend the service life of L-shaped rubber ring, up to 4 months. This finding provided a new insight for the optimization of the SSWS for slurry pump, which could improve the operational stability and reliability of cutter suction dredger in the construction of marine infrastructure.
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Optimization of Shaft-seal water system of cutter suction dredger based on high-efficiency centrifugal separation technology
Separation and Purification Technology, 2020Co-Authors: Zhishan Bai, Bingjie Wang, Xigang Yang, Hu Xiaoxue, Tianbiao ZhaoAbstract:Abstract The Shaft-seal water system (SSWS), as one of the critical systems for slurry pump protection, is widely used to provide Shaft-seal water in cutter suction dredger. In general, the Shaft-seal water obtained from gravity clarifier always accompanies with numerous sand with large size (>10 μm), resulting in the inevitable intense wear of components in the slurry pump, especially, the Shaft Sleeve and L-shaped rubber ring in back Shaft seal. Even worse, the high temperature caused by unstable Shaft rotation in the present of sand will aggravate the degree of this wear. To address the above thorny problems, in this study, water-sealed hydrocyclone (WSH) was unprecedentedly applied to optimize SSWS for high-efficiency sand centrifugal separation. The dimension and structure of WSH were designed and optimized before final industrial application. High-efficiency separation zone (the separation efficiency >90%) with Re ranged of 1.88 × 104–2.23 × 104 was also confirmed by introducing the optimal structure of the WSH (5° of cone angle and 10 mm of bottom apex diameter). For the improved SSWS in the actual application, the Dv(50) of the Shaft-seal water decreased from 38.0 μm to 9.1 μm, and the corresponding solid concentration declined from 0.51 g/L to 0.051 g/L. Furthermore, it was verified that the optimized SSWS could significantly reduce the wear of the Shaft Sleeve and L-shaped rubber ring, and extend the service life of L-shaped rubber ring, up to 4 months. This finding provided a new insight for the optimization of the SSWS for slurry pump, which could improve the operational stability and reliability of cutter suction dredger in the construction of marine infrastructure.
Chen Li-jun - One of the best experts on this subject based on the ideXlab platform.
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Experimental Research of Extrusion Techniques for Totally Axle Shaft Sleeve Based on DEFORM
Journal of Jiamusi University, 2009Co-Authors: Chen Li-junAbstract:Aiming at the structural characteristics of totally axle Shaft Sleeve,with utilization of DEFORM software,the numerical simulation on the metal flow of different forming processes was made,and the optimal technological process was proposed consequently.The feasibility of this technology was proved through physical simulative experiments.The simulation result can instruct the technology practice,so the period of the new product is reduced and the totally axle Shaft Sleeve's quality is enhanced.
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The Upsetting-backward Extrusion Numerical Simulation for Axle Shaft Sleeve Based on DEFORM
Journal of Nanping Teachers College, 2007Co-Authors: Chen Li-junAbstract:Applying software DEFORM,the process of upsetting-backward extrusion has been analyzed for JX1030 axle Shaft Sleeve.The phenomenon of "expanding" and "necking" have been observed because of changing the diame- ter of die's big end,analyzed the reason,the solved measure has been put forward.The simulation result can instruct the technology practice.So the period of the new product is reduced,and the JX1030 axle Shaft Sleeve's quality is en- hanced.
Wei Guang-xuan - One of the best experts on this subject based on the ideXlab platform.
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Confirming and Manufacturing the Assembling Size of Thin-wall Shaft Sleeve
Shandong Metallurgy, 2005Co-Authors: Wei Guang-xuanAbstract:Adding thin-wall Shaft Sleeve is a normal method in repairing axes. When confirming the outside diameter deviation, especially in the evidence of thin-wall Shaft Sleeve, the expanding of Shaft Sleeve's outside diameter must be considered after fixing the Shaft and its Sleeve, then the constructional workpiece out of the Shaft Sleeve can meet the need of using.
Xiaoxue Hu - One of the best experts on this subject based on the ideXlab platform.
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optimization of Shaft seal water system of cutter suction dredger based on high efficiency centrifugal separation technology
Separation and Purification Technology, 2020Co-Authors: Xiaoxue Hu, Bingjie Wang, Ziqiang Hu, Xigang Yang, Tianbiao ZhaoAbstract:Abstract The Shaft-seal water system (SSWS), as one of the critical systems for slurry pump protection, is widely used to provide Shaft-seal water in cutter suction dredger. In general, the Shaft-seal water obtained from gravity clarifier always accompanies with numerous sand with large size (>10 μm), resulting in the inevitable intense wear of components in the slurry pump, especially, the Shaft Sleeve and L-shaped rubber ring in back Shaft seal. Even worse, the high temperature caused by unstable Shaft rotation in the present of sand will aggravate the degree of this wear. To address the above thorny problems, in this study, water-sealed hydrocyclone (WSH) was unprecedentedly applied to optimize SSWS for high-efficiency sand centrifugal separation. The dimension and structure of WSH were designed and optimized before final industrial application. High-efficiency separation zone (the separation efficiency >90%) with Re ranged of 1.88 × 104–2.23 × 104 was also confirmed by introducing the optimal structure of the WSH (5° of cone angle and 10 mm of bottom apex diameter). For the improved SSWS in the actual application, the Dv(50) of the Shaft-seal water decreased from 38.0 μm to 9.1 μm, and the corresponding solid concentration declined from 0.51 g/L to 0.051 g/L. Furthermore, it was verified that the optimized SSWS could significantly reduce the wear of the Shaft Sleeve and L-shaped rubber ring, and extend the service life of L-shaped rubber ring, up to 4 months. This finding provided a new insight for the optimization of the SSWS for slurry pump, which could improve the operational stability and reliability of cutter suction dredger in the construction of marine infrastructure.
