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Zheng H.P.,Hebei University of Science and Technology | Chen L.,Hebei University of Science and Technology | Wang W.,Nanjing Chenguang Group Co. | Peng L.Q.,Hebei University of Science and Technology | Zhang J.Y.,Hebei University of Science and Technology
Applied Mechanics and Materials | Year: 2014

Vibratory pile driving is a common application method of piles foundation construction. A test bed was designed and built according to the principle of vibratory pile driving. The test bed is composed of excitation system, machinery parts and signal acquisition system. At first soil samples with different relative compactness and different saturation were made. Then tests of vibratory pile driving have been done by using the soil samples and the test bed. For each soil sample, time of pile sinking to the bottom of the container was recorded respectively under the condition of the exciting force with same amplitude. The time represents efficiency of vibratory pile driving. The former is shorter and the latter is higher. Relationships between efficiency of vibratory pile driving and exciting frequency, relative compactness of soil, saturation of soil were researched respectively by single factor method. The experimental results have guide meaning to vibratory pile driving construction. © (2014) Trans Tech Publications, Switzerland. Source

Yan J.,Nanjing University of Aeronautics and Astronautics | Xie J.,Nanjing University of Aeronautics and Astronautics | Li J.P.,Nanjing Chenguang Group Co. | Zhang D.,Nanjing University of Aeronautics and Astronautics | Zuo D.W.,Nanjing University of Aeronautics and Astronautics
Key Engineering Materials | Year: 2010

A kind of model oriented assembly process simulation in WTK environment has been proposed. In the model, firstly, the assembly hierarchy of mechanical products can be presented clearly. Secondly, the assembly constraints between parts can be added to the model easily. At last, the assembly process information such as assembly sequence and path for each part can be recorded at real time in the model. Then, the converted method from PRO/E system to WTK environment about the mechanical product's design information including geometric models, product design hierarchies and constraints has been discussed, which makes for easier building the model in the virtual environment. Source

Dai W.,Beihang University | Lian Y.,Beihang University | Xiao J.,Beihang University | Luo G.,Nanjing Chenguang Group Co.
Proceedings of 2015 the 1st International Conference on Reliability Systems Engineering, ICRSE 2015 | Year: 2015

This paper develops a series of standardized procedures and improvements specific to inefficiency of domestic process reliability research by analyzing problems existing in process optimization of some current model. Firstly, weak links are identified through theoretical analyses including process FMECA. Secondly, mechanisms of process defects and critical stress are acquired by constructing physics model of failures, during which optimization measures need to be proposed. Finally, the optimization measures should be verified by the combination of theoretical analyses and FEA. The results should be subsequently applied to design and manufacture if approved. Demonstrated by tests, the standardized procedures is able to effectively identify critical stress and defects, making optimization more scientific and consequently improving efficiency. © 2015 IEEE. Source

Xu X.,Nanjing Chenguang Group Co. | Sun Y.,Nanjing University of Science and Technology | Jiang Q.,Nanjing University of Science and Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

When film was winding, the tension and the stability had a decisive impact on the winding quality. According to the dynamic process of the winding system of a casting machine, the dynamic relationships among tension and speed, radius, rotate speed were analyzed, the principles of tension control were proposed, and the compensation law of the rotaty speed was calculated when the radius was increasing and the winding roller was shifting. Based on the models, a tension control system was designed. The tension was controlled indirectly by controlling the difference of speed, and was controlled directly by using BP neural network PID controller to adjust the motor speed. Simulation results show that the controller has a good dynamic response and the anti-jamming ability. In practice, it also proves that the control system is feasible. It has a high precision of tension control and has great significance to improve the dynamic performance of the system and the winding quality of the film. Source

Chu J.,Beihang University | Dai W.,Beihang University | An J.,China Nuclear Power Engineering Co. | Yong S.-R.,Nanjing Chenguang Group Co. | Zhao Y.,Beihang University
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2015

To improve the mission reliability of the manufacturing process and to quantitatively represent the changes of basic reliability and mission reliability in different rework strategies, a rework model based on stress-strength interference theory was built up. Through statistically analyzing the large amounts of historical data produced from the actual process, the function between reliability and mission payload could be simulated. The mission reliability and unit costs of each rework strategy based on the rework model were calculated under the given input quantities. Each rework strategy could be analyzed by calculating with the weighted decision value, and then the best rework strategy was found. An application case was used to prove the correctness of the method. ©, 2015, CIMS. All right reserved. Source

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