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Zhuzhou, China

Yin S.-X.,Zhuzhou Lince Group Co. | Hong M.-Q.,Hunan Automotive Engineering Vocational College
Zhuzao/Foundry | Year: 2014

Reasonable planning in-gating system, and setting up heat insulating feeder over the top of the hot spot of the bearing room to exhaust and feed during the casting design of the axle box. Except this, using chill to adjust hot spot at the bearing room and the bolt hole which connecting the traction motor, then to reduce the solidification time of these molten iron, avoiding the graphite to grow into the coarse graphite or degradated spheroidization, so to ensure that the spheroidization and graphite grade of the axle box casting to reach the requirements of the design standard. Source

Chen X.,Hunan Railway Professional Technology College | Zeng H.,Zhuzhou Lince Group Co. | Li Z.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2010

Rolling bearings are widely used in various areas including aircraft, mining, manufacturing, and agriculture, etc. The breakdowns of the rotational machinery resulted from the rolling bearing failures account for 30%. It is therefore imperative to monitor the rolling bearing conditions in time in order to prevent the malfunctions of the plants. In the present paper is described a fault detection and diagnosis technique for rolling bearing multi-faults based on wavelet-principle component analysis (PCA) and fuzzy k-nearest neighbor (FKNN). In the diagnosis process, the wavelet analysis was firstly employed to decompose the vibration data of the rolling bearings under eight different operating conditions, and for each sample its energy of each sub-band was calculated to obtain the original feature space. Then, the PCA was used to reduce the dimensionality of the original feature vector and hence the most important features could be gotten. Lastly, the FKNN algorithm was employed in the pattern recognition to identify the conditions of the bearings of interest. The experimental results suggest that the sensitive fault features can be extracted efficiently after the wavelet-PCA processing, and the proposed diagnostic system is effective for the rolling bearing multi-fault diagnosis. In addition, the proposed method can achieve higher performance than that without PCA with respect to the classification rate. © (2010) Trans Tech Publications, Switzerland. Source

Qu X.,Hunan University | Han X.,Hunan University | Bi R.,Hunan University | Tan Y.,Zhuzhou Lince Group Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

In order to reduce the weight of impeller, a multi-objective genetic optimization method and process of the impeller of rail axial fan was established by analyzing the impeller of the numerical calculation method and constructing Kriging model. The numerical calculation method was established by the reverse analysis model and mesh density accuracy. The sampling space of impeller was obtained by Latin hypercube experimental design model. Kriging model of impeller with sufficient accuracy could replace the numerical analysis. The sensitivity of the main technical parameters of the force on the impeller structure was analyzed by the method and the most influential parameters on the impeller structural stress were identified. The weight of impeller is reduced by 31.7% by optimization and save the cost of materials. The maximum stress value is also changed from the initial 21.5 MPa to 16.5 MPa, which effectively improve the mechanical performance of the impeller. After optimization, dynamic and static experiments were used to the impeller by the slip ring electric and dynamic and static strain testing system, and the impeller rotating machinery equipment and the technology of testing plan was designed. Experimental results and calculation results are very close and the dynamic stress is relatively small, so the impeller has a good mechanics and vibration performance, and has high value in engineering applications. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved. Source

Song Y.,Hunan Railway Professional Technology College | Zeng H.,Zhuzhou Lince Group Co.
Proceedings - PACCS 2011: 2011 3rd Pacific-Asia Conference on Circuits, Communications and System | Year: 2011

The reasonable conductor section is an important content of grid planning, which could help the energy-saving and conservation. Three conductor section selection methods, including the conductor economical current density method, the fever condition method and the voltage loss condition method, are described in this paper. The compared result of an calculation example shows the conductor section chose by economical current density method is too larger than other methods. Hence, a new optimization method of conductor section selection is designed, and the calculation result testified its correctness and effectiveness. © 2011 IEEE. Source

Zhu D.,China Three Gorges University | Zhan T.,China Three Gorges University | Zhan T.,Zhuzhou Lince Group Co. | Zhang Y.,China Three Gorges University | And 3 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2015

In order to solve the problem of multi-objective size optimization of truss structures with stress constraints, a multi-objective optimization algorithm with multi-neighborhood was proposed. Based on the Euclidean distance between individuals, the population was divided into multi-neighborhood to form several niche populations. A number of individuals were assigned to each cell as neighborhood by the proposed algorithm. The individuals were only allowed interacting with each other within its neighborhood and generating offspring. The influence of different sizes of neighbors on the performance was analyzed through simulation experiments. The test results on 18 benchmarks revealed that the proposed algorithm outperformed some state-of-the-art algorithm in terms of covered area and diversity, which showed good uniformity and diversity. The obtained Pareto front showed good uniformity and diversity when solving the classic multi-objective optimization problem of 25-bar truss structure. The algorithm showed good performance in program design, solution space and generality and so on, which was very simple, practical and suitable for engineering practice. ©, 2015, Chinese Society of Agricultural Machinery. All right reserved. Source

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