Papers by Keyword: Diesel Engine

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Authors: Jian Ping Zhang, Yan Kun Jiang, Xin Liu, Zhe Lin Dong
Abstract: Aiming at a large marine diesel engine, a mathematical model for the 3-D elastohydrodynamic lubrication analysis of piston ring-cylinder liner was presented. The average Reynolds equation and asperity contact approach were combined with the elastic deformation equation. The asymmetry in the circumferential direction, gas blowby and the effect of temperature and pressure on the oil density and viscosity were considered. The 3-D wear simulation of piston ring-cylinder liner was performed when the diesel engine was operated under warm start and cold start conditions, respectively. The 3-D distribution rules show that the first gas ring has the biggest wear loss, and the maximum wear loss of cylinder liner occurs in the vicinity of TDCF. Finally, the results matched well with the wear measurements, and it indicates the present method is effective and can help engineers to improve the tribological performance of the diesel engine.
Authors: Xi Lian Diao
Abstract: This paper developed a high efficiency, simple to use and reliable, strong practicability of model 6120 diesel particulate filter regeneration control pulse inverse blow system. The pulse counter blowing regeneration test, and post-processing of particles back down to do the further research. The experimental results show that this device can wall honeycomb ceramic filter for filtering and counter blowing regeneration test and research.
Authors: Chun Lan Mo, Wen Zhong, Wei Guan, Wei Wei, Hao Zhong Huang, Lian Luo
Abstract: The thermodynamic cycle analysis of diesel engines using the engine cycle simulation programs is feasible. The comparison of dual and LIVC miller cycles engine fueled with ED10 diesel/ethanol blends on temperature and emissions are investigated by simulation. From the comparison, +0.85 EIVC miller cycle is a selection for an optimizing point of miller cycle ratio, i.e, the intake valve timing of the engine is good for NO emission, SOOT emission and the engine power output. The difference of EIVC and LIVC miller cycle was studied. The results show the tendency of performance with EIVC miller cycle is similar to that of LIVC miller cycle. But the peak cylinder combustion temperature of EIVC miller cycle become lower relative to LIVC miller cycle, which lead to slightly lower NO emission and slightly higher SOOT emission for EIVC miller cycle.
Authors: Nan Nan Sun, Y.J. Chiang, Guo Xiang Li, Yang Wang
Abstract: Combined together with the cyclic stress-strain theory and cumulative damage theory, a new fatigue life prediction model is proposed. Existing tensile-compressive fatigue models and the proposed new model are used to estimate the fatigue life of several kinds of metal and a comparison is made between the predicted results and the field-test data. The proposed new model is also applied to the strain spectra of several Diesel engine components. The new proposed stain-life equation is proved to be valid for the life prediction of materials and engine components.
Authors: Xiao Guo Chen
Abstract: A general fuzzy clustering analysis theory method is introduced at first, then a GAFCM algorithm and its implement steps are given. The diagnosis types of the test samples are judged by getting across the most of the Euclid pressing close degree choosing approximately principle. Practice proves that this method can be used to diagnose the diesel engine vibration faulty.
Authors: Zhi Peng Feng, Li Liu, Ping Wang
Abstract: A condition monitoring and fault diagnosis system for heavy duty diesel engines used in off-highway vehicles is developed. Via this system, the vibration, rotating speed or angle, temperature and pressure signals can be collected simultaneously at a high speed. The software is developed using virtual instrument technique. The system provides various types of signal analysis methods, and manual and intelligent diagnosis functions. Its performance is validated in engineering practice. The system can be generalized for monitoring and diagnosis of various reciprocating engines.
Authors: Yong Zhou, Yu Feng Zhang, Hong Kai Jiang
Abstract: In order to enhance the reliability of small power generating units, a strategy of the self-tuning control of nonlinear PID for the digital governor is presented. By analyzing the control system of the diesel engine, the basic control parameters are confirmed. Compared the digital PID with the traditional PID, a novel self-tuning control strategy is proposed, which uses the nonlinear PID algorithm. The principle of the nonlinear PID parameters is proposed, the tables of the detailed data are presented. The hardware platform of this structure is composed of host-computer and servo-controller. Using this system, the response speed could be enhanced. For the better performance of this system, the Smith Prediction is used in the control strategy at the proportional process. At the end of this paper, the experiment results verified that the control strategy is reliable, the nonlinear PID parameters are rational, and the system has better dynamic response.
Authors: Qian Wang, Jing Wang, Heng Song Ji, Chen Gu
Abstract: Based on the in-cylinder hydrokinetics and by coupling the multidimensional model of in-cylinder combustion and verifying the rationality of the computational model, this thesis uses KIVA-3V program, which has been added a new subprogram, to provide a numerical simulation of the in-cylinder pressure, the temperature and the NOX distribution and emission of a diesel engine in different injection advance angles, so as to analyze the change of in-cylinder pressure and temperature, and to find out the rules of temperature distribution, the NOX distribution and emission condition. This thesis is of guiding significance to the better understanding of the performance of diesel engines and to the optimum design and research of the diesels.
Authors: Zhao Qian Zhu, Wen Ming Zhang, Xiao Ming Zhang, Yu Peng Shi
Abstract: This paper studied the time-domain waveform characteristics of diesel engine cylinder head vibration. The relative relationship between the various explosions of diesel engine were analyzed and compared. Seven criteria were proposed under which to achieve the time domain waveform peak identification in the absence of TDC signal. According to the criteria computer algorithms for the time domain waveform peak identification were given. The method can reduce the vibration diagnosis system using request such as can achieve misfire fault diagnosis in the absence of TDC signal.
Authors: Ying Kui Gu, Yao Gang Xiong, Xin Chong Luo
Abstract: A reliability risk assessment model based on fuzzy FMEA was presented by using fuzzy comprehensive evaluation. Fuzzy matrixes were constructed according to the investigation data, in which occurrence probability ranking, effect severity ranking and detection difficulty ranking are all weighted analyzed. A fuzzy hierarchy analysis method was used to obtain the weight of each influence factor. In the model, the potential fault modes and the reasons can be analyzed and the preventive measures can be taken in prevention stage to avoid finding the problems after the products are put into production and market. It will provide new ideas and new methods to improve the operation security of the engine, to prevent and forecast failure, and to estimate and control the risk.
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