Academy of Armored Forces

Bengbu, China

Academy of Armored Forces

Bengbu, China
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Tang Z.,Beijing Institute of Technology | Tang Z.,Academy of Armored Forces | Yan Q.,Beijing Institute of Technology | Liu Y.,Academy of Armored Forces
Qiche Gongcheng/Automotive Engineering | Year: 2013

For the performance analysis on any structural type of vehicle transmission system, the modeling of vehicle transmission system based on hypergraph theory is studied. After the basic principle and procedures of hypergraph modeling are expounded, the hypergraphs model for the rotation speed and torque of typical transmission components are constructed first by mapping the parts of transmission components into the vertices of hypergraph models, while mapping theirs physical connections into the edges of hypergraph models. Then with the virtual vertices introduced, the input and output of transmission system are mapped into the source and target vertices of hpyergraph models, and the speed and torque hypergraph models for the complete transmission system are built. Finally based on the depth-first search algorithm, the topological manipulations on rotation speed hypergraph model are carried out, realizing the automated analysis on shifting gear of transmission system.


Tang Z.,Beijing Institute of Technology | Tang Z.,Academy of Armored Forces | Yan Q.,Beijing Institute of Technology
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012

To improve the efficiency of the design and analysis, a computer-aided analysis technology for the planetary transmission was conducted. According to the analysis of planetary transmission and the connection of its module, the general mathematical models of the revolution and torque, which based on the model library for the planetary, clutch and brake, were constructed, and the kinetic equations of planetary transmission were automatic listed. A corresponding computer-aided analysis (CAA) software was programmed which realized the rapid modeling, automatic listing and equations solving, and performance analysis for the planetary transmission system.


Yu H.-L.,Academy of Armored force Engineering | Yang H.-J.,Troop at No. 76327 of PLA | Qian Y.-C.,Military Representative Office at No. 5137 Factory | Zhao C.-F.,Academy of Armored Forces | Xu B.-S.,Academy of Armored force Engineering
Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy | Year: 2012

Tribological properties of aluminum silicate (Al4[Si4O10](OH)8) mineral micro-powders, with an average size of 1 μm, as diesel engine oil (50CC lubricating oil) additive were evaluated on an end-face friction and wear tester. The morphologies, element distributions and micro mechanical properties of the worn surface were investigated by means of scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and nano-indentation tester, respectively. Results indicate that friction reduction and wear resistance properties of 50CC oil improve effectively by adding natural mineral micro-powder. The minimal value of the coefficient and wear rate can be obtained when the micro-powders concentration is 0.75% (mass fraction). It can be inferred that a protective film composed of Si, Al and O forms on the worn surface. The film exhibits an average hardness (H) of 7.05 GPa, which is 69.8% higher than that of worn surface lubricated with base oil. Whereas its average modulus (E) is about 237.4 GPa, as is still with steel substrate level.


Liu J.,Beijing Institute of Technology | Yan Q.-D.,Beijing Institute of Technology | Ma Y.,Beijing Institute of Technology | Tang Z.-H.,Academy of Armored Forces
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2015

The improved ant colony algorithm and path geometry optimization were applied to solve the global path planning problem of mobile robot. The obstacle performance was combined in the proposed algorithm to establish the workspace model of the robot. By setting the initial pheromone, the ant searching speed was accelerated, and through the adaptive pheromone mechanism, the interference problem of initial pheromone to the specific map was solved. In addition, the pros and cons of the path planning were screened by setting the adaptive path length. It was also proposed that the pheromone spreading strategy was decided by the path length. Meanwhile, according to the principle of geometry, the planning path was optimized to accelerate the convergence speed of the optimal solution. The effectiveness and universal application of the proposed algorithm was demonstrated by the simulation results. In the random environment map, the optimal path could be rapidly obtained with the proposed algorithm. ©, 2015, Northeastern University. All right reserved.


Tang Z.,Beijing Institute of Technology | Tang Z.,Academy of Armored Forces | Yan Q.,Beijing Institute of Technology | Liu S.,Beijing Institute of Technology
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012

To improve the performance of hydraulic transmission system, a study on the matching performance of engine and hydraulic torque converter was conducted. According to the power split-flow form, hydraulic transmission systems were divided into two classical structure modals. With the two structure modals were abstracted according to graph theory, a computer program was developed using Python language, which could finish auto-derivation and auto-solving, and finish the matching calculation of engine and torque converter. Combined with a matching calculation example, a comparison study of the results of the two structure modals under different road conditions was carried out, which showed that the matching performance of engine and hydraulic torque converter in the hydraulic transmission systems with front power split-flow was obviously influenced by external load, and the load effect had to be considered in the study on its cooperating performance.


Yan Q.,Beijing Institute of Technology | Zou B.,Beijing Institute of Technology | Zou B.,Tiema Industries Corporation | Tang Z.,Beijing Institute of Technology | And 2 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012

To optimize the parameters of blade numbers of vehicular hydraulic retarder, a 3-D integrated optimization platform was established. The brake torque of hydraulic retarder was calculated with CFD solver and DOE technique of design variable. With DOE results, the RSM model was built to get the optimum parameters. The relationship of internal flow field and brake performance with the varying blade numbers was analyzed and concluded. Comparison of experimental data and simulation results before and after the optimization showed that the brake performance of hydraulic retarder with the optimum parameters was improved observably, and the 3-D integrated optimization platform was accurate and reliable.

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