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RISS 인기검색어
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- 저자 : Zengming Feng (검색결과 5 건)
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FENG Zengming,PU Qianshuai 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Based on studying of the working principle of rocker-pin chain Continuously Variable Transmission (CVT), the profile of rocker pin was improved from arcs into a combination of involute and cardioid which has better transmission performance. The notion of equivalent teeth number was brought up, and then the equivalent teeth numbers of the driving and driven pulleys were calculated under different transmission ratios. The variable pitch characteristic of new rocker-pin chain was studied and the harmonious relationship between transmission ratio, pitch increment and chain link rotation angle was analyzed. Based on the force analyzing of each component of CVT, transmission efficiency of the CVT was studied and the discipline of transmission efficiency changing with the variation of friction wedge angle was analyzed. The calculation results show that the new design method not only realize the variable pitch characteristic, but also improve the transmission efficiency of new rocker-pin chain CVT effectively.
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Dynamic Analysis of Timing Silent Chain System for a V-type Engine of a Vehicle
Feng, Zengming,Tang, Lechao,Li, Jun,Jia, Yanhui The Korean Society of Mechanical Engineers 2015 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.3 No.2
Based on multi-body dynamic software RecurDyn, this paper proposes a modified form of timing silent chain system combing with the existing problem that vibration and chain tension is too large, which is applied for complicated conditions in a V-type engine, such as high speed, variable loads. The analysis of chain drive meshing characteristics is completed. Using the multi-body dynamic soft-ware RecurDyn, the dynamics characteristics of the improved system is studied, including chain tension, transmission error, chain fluctuations, equivalent spring force in different operating conditions. The study results show that chain tension, transmission error, chain fluctuation and equivalent spring force are within the scope of permission, all of them can meet the design requirement. There-fore, the design of this system is reasonable and practicable. The research results will provide a basis for assessing timing silent chain system in a V-type engine and a theoretical reference for designing and optimizing the timing silent chain system.
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Vibration and noise source identification methods for a diesel engine
Jiaxin Xi,Zengming Feng,Guoqiang Wang,Fei Wang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
In this study, we used a four-cylinder inline diesel engine as an example to explain how to use test methods and multi-body dynamictechniques to identify the exact source of noise and vibration. A 1 meter noise test was conducted to indicate that the engine front end isthe main source of noise. The near-field sound intensity method and the near-field acoustic holography technique were used to identifythe chain drive system as the source of noise and vibration. A 3D dynamic analysis model of the timing chain drive system was establishedusing RecurDyn software. Results of the analysis show that the hydraulic tensioner is incompatible with the timing drive system ofthe bush roller chain. Hence, the timing chain system causes a loud noise and strong vibration. Some strategies on how to optimize thetiming chain drive system are presented at the end of this paper.
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Multibody dynamics analysis of a silent chain drive timing system
Jinxing Yang,Zengming Feng,Huanhuan Gao,Tianrui Wang,Kai Xu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
Multibody dynamics analysis of a silent chain drive timing system can quickly detect system defects in the product design stage and shorten the development cycle. At present, most of the research on chain drives focuses on roller chains. A 3D silent chain drive timing system model considering the fluctuation of crankshaft sprocket speed and camshaft sprocket torque was established in this paper based on recursive algorithm and Hertz contact theory. The accuracy of the model was verified by comparing the experimental and simulation results of the chain tension. The simulation results show that the chain tension fluctuation with time is obviously affected by the camshaft torque fluctuation, and the maximum chain tension ranges from 233 N to 1202 N, which is less than the safe rotation fatigue limit 1600 N. When the crankshaft sprocket speed is 6000 r/min, the maximum contact force between the chain and crankshaft sprocket and slack guide is 751 N and 588 N, respectively. The maximum chain fluctuation caused by meshing impact between chain and sprocket and polygon effect is 0.52 mm and 0.48 mm, respectively. The system transmission error ranges from 0.14° to 0.38°, which is less than 1° of the maximum allowable transmission error.
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DHEM: a deep heat energy method for steady-state heat conduction problems
Huanhuan Gao,Wenjie Zuo,Zengming Feng,Jinxing Yang,Tingting Li,Ping Hu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
Based on the deep energy method recently brought forward to handle linearelastic or hyper-elastic finite deformation problems in solid mechanics, in this paper, we propose a deep heat energy method (DHEM) which is specially tailored to deal with structural steady-state heat conduction problems with the help of deep learning techniques. In our work, the deep neural networks are utilized to construct the admissible temperature fields; secondly, the potential energy functional in the heat conduction process which works as the loss function of the deep neural networks is calculated by numerical integration techniques; finally, the parameters of the network including weights and bias, are optimized by the quasi-Newton method to yield the minimal of the potential energy functional which indicates the heat conduction has entered a steady state. Numerical examples with a diversity of materials, including the isotropic and homogeneous material, the orthotropic material, the non-homogeneous materials and temperature dependent materials, are carried out to illustrate the validity and capacity of DHEM in both linear uncoupled and thermal-material coupling heat conduction problems.
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