Papers by Author: Guo Ying Zeng

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Authors: Deng Feng Zhao, Guo Ying Zeng
Abstract: Based on the group theory and the complex division method, the dimension classified method for planar multi-loop mechanism was analyzed. Firstly, the dimension classified inequation was derived from the singularity of constraint equation of the mechanism. Subsequently, by using the classified inequation, the complex division method of the structure-parameter-space was explored. By using the mechanism symmetry group, the simplification method of the division results was analyzed. Finally, by using an example, the classified methods were validated. The results show that all information about mechanism classification are included in the division results. Besides, this method is appropriate for complicated mechanism classification by computer.
Authors: Guo Ying Zeng, Deng Feng Zhao
Abstract: The three-dimensional vibratory strengthening and polishing technology was used to strengthen and polish aeroengine blades with complicated surfaces. At first, the principle of the strengthening and polishing process was introduced, which combined strengthening process with polishing process. Then, the technological parameters influenced on the surface quality were investigated. The principal variables were the media hardness, the frequency and amplitude of the vibration, and duration of the vibratory strengthening and polishing. The optimum parameters were obtained. Experimental results revealed that, after strengthening and polishing, the surface roughness of aeroengine blades was reduced from Ra0.35-0.5μm to Ra0.1-0.12μm, and fatigue strength was increased by approximately 50%.
Authors: Guo Ying Zeng, Deng Feng Zhao
Abstract: Based on micro-fluid control, a rapid metal forming method with high efficiency is proposed. At first, the basic principal is introduced. The metal liquid flows out of a large number of micro-pores, and the multipoint parallel crystallization is thus realized. During the forming process, the open or close of micro-pores is controlled by surface tension to obtain required shape of part. Then the technological parameters are deduced. Preliminary experiment shows that rapid open and close of micro-pore can be realized acted on surface tension. This method has the basic characteristics of rapid prototyping technology and continuous casting technology, which can overcome the shortcomings of inefficient and difficulty to create high melting point metal parts for current rapid prototyping.
Authors: Deng Feng Zhao, Guo Lu Ma, Guo Ying Zeng
Abstract: Optimization method was applied to obtain optimal television packaging cushion for reducing drop impact response on television. At first, by establishing the parametric finite element model of television with packaging, the drop simulation was performed, and the equivalent stress distribution, acceleration response curve and other related parameters were obtained. Simulation shows that maximum acceleration is overload. Then, structural optimization of television with packaging was performed. The equivalent stress distribution and acceleration curves of optimal packaging and without optimal packaging for the independent components were studied. The results show that maximum acceleration is reduced and the cushioning performance is enhanced.
Authors: Yong Juan Zhang, Guo Ying Zeng, Deng Feng Zhao
Abstract: A nonlinear model of bolt joints structure in vibration environment is built and Structure Intensity(SI) of it is calculated by FEM as an approach for the state identification of bolts joints structure in vibration environment. The plots of the structure intensity vector under different preforce were obtained and showed the SI changes of bolt joints structure with different preforces.and showed the energy distribution and transmission are different preforces
Authors: Guo Ying Zeng, Deng Feng Zhao
Abstract: The structural intensity of shells structure was analyzed based on finite element method (FEM) in this paper. The expressions of structural intensity of plate in FEM were given under harmonic excitation. By using coordinate transformation, mathematical expressions of the structural intensity of shells structure in FEM were deduced. The structural intensities of a rectangular plate and combined structure of tube and plate were calculated. The vector plots of structural intensity under different excitation frequencies were analyzed. The results show that the structural intensity under different frequencies are different, the vector plots present directly the distribution and propagation of energy in shells structure.
Authors: Mei Zi Tian, Deng Feng Zhao, Guo Ying Zeng, Hang Rui Yan
Abstract: Based on the vibration mechanics theory and system’s state equation, the state-space model of the flange bolted-joints structure is established. According to the dynamic characteristics of bolted connection, the parameters of the state-space model, such as rigidity and damping, can be identified. The accuracy of simulation model is validated, by comparing the simulation analysis results with the vibration test results, and an efficient method of recognition or fault diagnosis of bolted joints in vibratory environment is proposed.
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