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Jing B.,Zhejiang Normal University | Liu J.,Changsha Zoomlion Heavy Industry Science and Technology Development Co. | Wang B.,CSR Qishuyan Institute Co. | Yu P.,Jilin University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

The drum cone angle is the most important design parameters in the horizontal screw centrifuge, and its size has important implications to the sediment moisture rate. It can only select the cone angle based on the experimental data parameters at present. This method is time-consuming and labor-intensive, and can not find the best angle due to the experimental error. Firstly, combining with the characteristics of the mud buildings, the laws of solid-liquid separation of drum cone is studied by using FLUENT software. Then, the cone angles of 6°, 7.5°, 9.5°, 12° are selected to model and mesh. The drum velocity field of decanters under different cone angle is simulated and analysed. Finally, the double tapered drum of large diameter decanters is designed to meet the building mud. The simulation results show that the maximum sediment thickness is closer to the sub-discharge port when the cone angle is 9.5° which is an optimal cone angle parameter. The designed double tapered structure of the cement separation liquid moisture has a higher handling capacity and lower moisture content, so the structure of the whole performance is greatly improved and the work efficiency of decanters is increased. © 2013 Journal of Mechanical Engineering.

Jiang N.,South China University of Technology | Chen G.-X.,South China University of Technology | Li Z.-F.,Changsha Zoomlion Heavy Industry Science and Technology Development Co.
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2012

Through the tensile tests of specimens and the finite element simulations of cylinder vessels, the effects of loading path and pre-strain quantity on the plastic instability pressure of strain-strengthening vessels were analyzed. The results indicate that the loading path has no obvious effect on the ultimate bearing capacity of the specimens and the pressure vessels, and that, though different pre-strain quantities make vessels produce plastic deformations to variable degrees, the material reinforcing effect may make up for the impact of vessel size change to a certain extent. Thus, only a slightly-decreased plastic instability load of the cylinder vessels is observed. Moreover, it is found that, at a diameter ratio of 1.02~1.10 for thin-wall vessels, the wall thickness has little influence on the decrease of plastic instability pressure. Considering the change of both the geometric shape of vessels and the stress-strain curve after the hardening, the strain hardening ranging from 4% to 12% may result in a decrease of the minimum safety margin from conventional 4.76 to 2.21, which meets the demand for the minimum safety margin set by international standards, thus concluding that the vessels after strain hardening are still of relatively high strength margin.

Gao C.-R.,Taiyuan University of Science and Technology | Ren H.-L.,Changsha Zoomlion Heavy Industry Science and Technology Development Co.
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2011

The boom and rope was taken as flexible bodies, virtual prototype model of the mooring crane-ship was established based on flexible multi-body theory. DC gains of the individual modes of vibration were used as the criterion of modal truncation, and then a small state space model was defined. The reduced model can accurately describe the pertinent dynamics of original system. The dynamic responses of the crane-ship affected by those key parameters of the system were analyzed, the results demonstrate that the vibration of the ship and the load of the rope are affected by the flexible of the boom, and the in-plane angle have coupling with the out-of-plane angle. An experimental setup was built. The dynamic test of the load system was carried out. The comparison between test and simulation shows that the dynamics model is correct and feasible.

Huang F.,Hunan University | Han X.,Hunan University | Gong S.,Hunan University | Huang Y.-H.,Changsha Zoomlion Heavy Industry Science and Technology Development Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2011

The combination of reduced-basis method(RBM), finite element method, Fourier transformation and Newmark direct integral method was introduced for transient response analysis of a piezoelectric laminate subjected to coupled electro-mechanical loads. The laminate was discretized in the thickness direction with plate elements, and the governing equations were obtained. The governing equations in wavenumber domain were gained with Fourier transformation. The Newmark direct integral method was employed to calculate the displacement responses and the electrical potential responses in wavenumber domain. The reduced-basis method was introduced during using Newmark direct integral method and a reduced basis space was constructed. The equivalent stiffness matrix, mass matrix and the load vector were projected into the space. The reduced Newmark formulation was obtained and the responses in wavenumber domain were calculated effectively. The transient responses were obtained by using the inverse Fourier transformation. The numerical results provided the transient responses excited by the coupled electro-mechanical line load in a PZT-5A/0° PVDF composite plate. They showed that the transient responses of a piezoelectric laminate can be solved rapidly by employing the proposed reduced-basis method.

Li Y.-X.,Zhejiang Normal University | Luo H.,Changsha Zoomlion Heavy Industry Science and Technology Development Co. | Qu Y.-M.,Changsha Zoomlion Heavy Industry Science and Technology Development Co.
Applied Mechanics and Materials | Year: 2011

Aiming at the deformation of the mast of rotary drilling rig, 3D graphics software Pro/E and finite element analysis software Ansys are applied to model and optimize the structure of the mast. Back sliding wheel installed on the mast of rotary drilling rig is firstly proved to be effective to reduce the deformation of the mast of rotary drilling rig. On this basis, the distance between back sliding wheel and the mast of rotary drilling rig, and the position of the pulley yoke are adjusted together to obtain the minimum deformation of the mast of rotary drilling rig, which improves the stability of the mast of rotary drilling rig in the course of construction, and provides theoretic supports for more optimization design and research of the mast of rotary drilling rig. © (2011) Trans Tech Publications.

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