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1. Numerical study and dimentional analysis of the particle seperation using the inertial force in a U-shap channel | |||
LIU Yang,CHEN Nuan | |||
Mechanics 05 May 2016 | |||
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Abstract:A U-shape microchannel combining inertial separation and acoustofluidics at the same time is shown to separate particles of different sizes. The function relationship between the lateral migration of particles and some parameters is deduced by dimensional analysis. Numerical studies in Fluent are consequently conducted to confirm this relationship. The result shows that the distant that the particles traverse the channel and the cube of the flow velocity of the fluid have a linear relation. This distance also has a linear relation with the diameter of the particle. These relationships will not only provide help for particle separation in the U-shape microchannel, but also gives a further understanding of particle motion in curved channel. | |||
TO cite this article:LIU Yang,CHEN Nuan. Numerical study and dimentional analysis of the particle seperation using the inertial force in a U-shap channel[OL].[ 5 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4686862 |
2. Joint optimization of firing orders and firing intervals for Multiple Launch Rockets System | |||
Tang Wenbing,Rui Xiaoting,Wang Guoping | |||
Mechanics 30 December 2014 | |||
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Abstract:Transfer matrix method for multibody system (MSTMM) is a new and efficient method for multibody system dynamics (MSD) developed in recent 20 years. Based on many advantages of MSTMM in studying MSD, the dynamics model and the dynamics simulation system for multiple launch rockets system (MLRS) are established. Joint optimization variables of firing orders and firing intervals are presented, combining with the Genetic Algorithms, the optimal design with the purpose of the best firing dispersion of MLRS is implemented. The optimal scheme is got and the firing dispersion has been increased 32.3%. Optimal design of firing orders and firing intervals is a low-cost and efficient way to improve the firing dispersion of MLRS. | |||
TO cite this article:Tang Wenbing,Rui Xiaoting,Wang Guoping. Joint optimization of firing orders and firing intervals for Multiple Launch Rockets System[OL].[30 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4625752 |
3. Design of visual dynamics software of transfer matrix method for multibody system | |||
Rui Xiaoting,Yang Haigen,Gu Junjie,Zhang Jianshu,Zhou Qinbo | |||
Mechanics 28 December 2014 | |||
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Abstract:In order to achieve the simulation of multibody system dynamics and the visualization of the process and results rapidly, a new and large-scale software named MSTMMSim is designed and implemented. This software use transfer matrix method for multibody system (MSTMM) as the core of dynamics modeling and computation. And the Open CASCADE is used to generate the solid geometric figure. The proposed software solves the problems that the global dynamics equations of the system are necessary to be developed and the orders of the involved system matrices are too high to meet the engineering requirements of fast computation, in the research of general multibody system dynamics. The MSTMMSim comprises three components: the pre-processor, the MSTMM solver and the post-processor. The pre-processor contains physical and dynamics modeling. The solver applies MSTMM to call the dynamics model generated by the pre-processor, and get the computational results by iteration. The post-processor provides various auxiliary analytical tools such as curve and animation to analyze and process the results. The MSTMMSim has the following features and abilities: rapid computation of mulitbody system dynamics, direct calling CAD files, automatic generation of the computation parameters and results, data analysis and processing, dynamics process visualization and so on. Engineering application are given to verify the validity and accuracy of the software and to show that the software has friendly interface, fast computation speed, high level of visualization, and broad scope of application. Practice simulation indicates that the software provides an effective digital platform of fast dynamics calculation, design, analysis and optimization for complex mechanical systems. | |||
TO cite this article:Rui Xiaoting,Yang Haigen,Gu Junjie, et al. Design of visual dynamics software of transfer matrix method for multibody system[OL].[28 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4625749 |
4. Effects of Substrate Properties on the Calculated Mechanical Properties of Film/Substrate Systems by Nanoindentation | |||
Yanguo Liao,Heping Hu,Yichun Zhou,Limei Jiang | |||
Mechanics 06 November 2008 | |||
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Abstract:In this paper, the conical nanoindentation on an elastic-plastic film bonded to an elastic-plastic substrate has been systematically investigated with finite element (FE) method. The mechanical responses of the combination of different film/substrate material systems to the maximum indentation depth have been obtained by changing the ratio between the maximum depth and thin-film thickness, hm/t, from 0.01 to 1.25 and by comparing FE analysis results with the corresponding bulk materials’ mechanical responses. The effect of substrate mechanical properties on the calculated mechanical properties of film/substrate systems and the indentation contact depth have been investigated for different film/substrate systems. | |||
TO cite this article:Yanguo Liao,Heping Hu,Yichun Zhou, et al. Effects of Substrate Properties on the Calculated Mechanical Properties of Film/Substrate Systems by Nanoindentation[OL].[ 6 November 2008] http://en.paper.edu.cn/en_releasepaper/content/25487 |
5. Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding | |||
Baosheng Liu,Fan Xiao-xin,Cheng Zhi-qiang | |||
Mechanics 26 December 2005 | |||
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Abstract:Powder segregation induced by mold filling is an important phenomenon to affect the final quality of Metal Injection Molding (MIM). The prediction of segregation in MIM requires a bi-phase flow model to describe distinctly the flows of metallic powder and polymer binder. Viscous behaviors for the flows of each phase should hence be determined. The coefficient of interaction between the flows of two phases should also be evaluated. However, only viscosity of the mixed feedstock is measurable by the capillary tests. Wall sticking is supposed in the traditional model for capillary tests, while the wall slip is important to be taken into account in MIM injection. Objective of the present paper is to introduce the slip effect in bi-phase simulation, and search the suitable way to determine the viscous behaviors for each phase with the consideration of wall slip in capillary tests. Analytical and numerical methods are proposed to realize such a specific purpose. The proposed method is based on the mass conservation between the capillary flows in mono-phase model for the mixed feedstock and in bi-phase model for the flows of two phases. Examples of the bi-phase simulation in MIM are realized with the software developed by research team. The results show evident segregation, which is valuable for improving the mould designs. | |||
TO cite this article:Baosheng Liu,Fan Xiao-xin,Cheng Zhi-qiang. Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding[OL].[26 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4631 |
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