Shanghai, China
Shanghai, China

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Liu B.,Shanghai JiaoTong University | Liu B.,Hudong Heavy Machinery Company Ltd | Li H.-L.,Shanghai JiaoTong University | Hu Z.-L.,Shanghai JiaoTong University | And 2 more authors.
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2012

Experimental study during load transit was conducted on a regulated two stage turbocharging (R2S) diesel engine. Transient test system of diesel engine with R2S was built. Regulating maps of R2S bypass valves were analyzed through the comprehensive steady-state experiment. Experimental method of load transit process was determined based on the steady-state regulating maps of bypass valves. Load transit performance test at same speed was conducted under three speed lines. Experimental results showed that the turbine bypass valve should be closed at low speed and high load. At low load, bypass valve was also closed to avoid the slowly rising of boost pressure and poor emissions performance. One modified regulating map was proposed to improve the response of turbocharging system of diesel engine. Meanwhile, smoke emission was improved.

Shi L.,Shanghai JiaoTong University | Feng L.-L.,Pan Asia Technical Automotive Center Co. | Zhou Y.-M.,Hu Dong Heavy Machinery Co. | Deng K.-Y.,Shanghai JiaoTong University
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2012

In order to solve the problem operating in low load range for two-stroke low-speed diesel engine, blowers were equipped to achieve high scavenge pressure. The scavenging model and blowers switching points were studied on 7K90MC-C two-stroke low-speed diesel engine. The engine model and blower model were developed. The simulation results were verified by the experimental results. The switching of blower was studied further. Results show that in order to reduce engine thermal load, the blowers should be cut-off near 41% load point in load increasing process and opened near 35% load point in load decreasing process.

Hu Z.,Shanghai JiaoTong University | Gui Y.,Hudong Heavy Machinery Co. | Xu M.,Shanghai JiaoTong University | Deng K.,Shanghai JiaoTong University | And 2 more authors.
Journal of Mechanical Science and Technology | Year: 2015

A continuous variable valve lift (VVL) mechanism for a diesel engine is proposed in this research. The hydraulic mechanism, which consists of a driving plunger, a driven plunger, a hydraulic cylinder, and a hydraulic oil tank, is the key part of the VVL mechanism. Simulation is conducted to study the relationship between maximum valve lift and rotation angle of driving plunger. Calculation results indicate that the maximum valve lift decreases with increasing rotation angle. A prototype was manufactured and successfully tested in a single-cylinder diesel engine. The experiments, which were conducted at different rotation angles of the driving plunger, validate the accuracy of the calculation results. The difference between experimental valve lift curve and cam lift curve is considered the result of oil leakage. Rotating the driving plunger is an effective method to regulate valve lift. Working stability of the VVL mechanism is validated through a multi-cycle operation. Experimental results indicate that the VVL mechanism is effective and reliable for realizing continuous VVL in engines. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.

Zhang S.-W.,Jiangsu University | Zhang S.-W.,Jiangsu University of Science and Technology | Ding Y.-L.,Jiangsu University of Science and Technology | Wang G.-C.,Jiangsu University | And 2 more authors.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2011

Aiming at the some frame parts structural features of certain marine diesel engine manufacturing enterprises, proceed from practical problems with which tool path planning was facing, feature-based planning and optimization technology of tool path was studied under the framework of CAD/CAPP/CAM integration system. Besides, planning and optimization system of tool path on marine diesel frame parts were developed, and the optimization solutions were cut with UG machining simulation module. By comparing to the traditional tool path planning results, the applicability of the method was proved. This system not only realized quick tool path generation of machining feature by extracting geometry and process information which were necessary to tool path planning, but also had good reference value to tool path planning and tool path optimization of other complex parts.

Zhang S.-W.,Jiangsu University of Science and Technology | Ding Y.-L.,Jiangsu University of Science and Technology | Wang G.-C.,Jiangsu University | Yang C.-Q.,Hudong Heavy Machinery Co. | Jia W.,Hudong Heavy Machinery Co.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2011

Aiming at the structural features of some frame parts in marine diesel engine manufacturing enterprise, key technologies for feature information extraction, feature matching, feature reconfiguration, feature process inference and feature tool path were studied. Machining feature information was transferred in above links by using the integration method based on Standard for the Exchange of Product model data (STEP) and feature technology. On this basis, a Computer Aided Design/Computer Aided Process Planning/Computer Aided Manufacturing (CAD/CAPP/CAM) integration system of marine diesel engine frame parts was developed and validated through a case. This system was characterized by easy operation with less human intervention. It could also be extended and applied in the information integration of other types of diesel engine parts.

Fang X.F.,Jiangsu University of Science and Technology | Wu C.Q.,Jiangsu University of Science and Technology | Zhang S.W.,Jiangsu University of Science and Technology | Jia W.,HuDong Heavy Machinery Co. | And 2 more authors.
Key Engineering Materials | Year: 2011

In order to choose milling parameters quickly, reasonably and improve milling quality, avoid vibration in milling frame part of marine diesel engine, combining the development trend of milling technology, the dynamic model for milling the guide plate surface of frame part is built, the experiment modal parameters of spindle-holder with a cutting tool and the guide plate surface are identified. Using dynamic forces and chatter lobes to build constraint conditions, so as to recommend process parameters, which can show guidance to mill the guide plate surface of frame part. Consequently, parameters choosing lied on traditional try cutting is avoided, processing cost is reduced and the chatter free material removal rate (MRR) is improved.

Zhang S.-W.,Jiangsu University of Science and Technology | Ding Y.-L.,Jiangsu University of Science and Technology | Wang G.-C.,Jiangsu University | Yang C.-Q.,HuDong Heavy Machinery Co. | Jia W.,HuDong Heavy Machinery Co.
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2012

By analyzing the key components feature similarity of different types marine diesel, similar machining feature, process and tool path of marine diesel key components were summarized. CAD/CAPP/CAM integrated technology of marine diesel key components was studied based on feature similarity, and feature machining template library was set up. Through dynamic combination of feature machining templates, the sharing and reuse of feature machining templates in CAD/CAPP/CAM integrated system were realized, and the results were verified by practicle examples. This system not only solved repetitive operations of similar manufacturing objects in CAD/CAPP/CAM integrated system, such as process reasoning, tool path planning, which reduced repetitions in manufacturing process and enhanced generality of CAD/CAPP/CAM integrated system, but also had good reference meaning to similarity utilizing in CAD/CAPP/CAM integrated system of other complex parts.

Fan L.,Harbin Engineering University | Wang H.,Harbin Engineering University | Li Q.,Harbin Engineering University | Song E.,Harbin Engineering University | And 3 more authors.
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2013

For the purpose of predicting the exhaust opening and closing processes, the researchers built a calculation model of an exhaust valve driving mechanism for intelligent low-speed marine diesel engine utilizing the AMESim software, to accurately simulate exhaust valve driving process and also validate functionality of the models by comparing test data. The function of the oil inlet chamfer, oil return chamfer and the orifice to the open and close progress of the hydraulic exhaust valve were analyzed and the corresponding conclusions were drawn. As the oil inlet chamfer of the hydraulic control unit of exhaust valve increases, the opening of the hydraulic exhaust valve takes place earlier and the closing of the hydraulic exhaust valve takes place later. The smaller the servo oil pressure, the more obvious phenomenon. The length of the close time of the hydraulic exhaust valve is smaller with the increase of the oil outlet chamfer. With the throttle diameter being bigger, it allows the open time of the hydraulic exhaust valve to be longer. Thus, the bigger the throttle diameter, the earlier the close time of the hydraulic exhaust valve.

Ding J.-H.,Shanghai Supercomputer Center | Song Y.-L.,Hudong Heavy Machinery Co. | Wang H.,Shanghai Supercomputer Center | Ren J.-J.,Hudong Heavy Machinery Co. | Liu B.,Shanghai Supercomputer Center
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

An explicit dynamic algorithm was adopted to perform detailed modeling and refined simulation for dynamic anti-shock problem of diesel engine. Individual and synthesized analyses were conducted so as to achieve the mechanical motion and dynamic shock simulations under different working conditions. High-performance computing(HPC) resources were utilized to meet the challenge of large scale computing requirement due to debugging and load cases. Through multi-core parallel computing and performance data comparison on different platforms, each parallel speedup phenomenon was analyzed to explore reasonable parallel acceleration strategy. The results show that such dynamic simulation method makes for the integrated kinetic and dynamic characteristics research of diesel engine, and HPC resource provides imperative guarantee for deeper investigation.

Xiao Y.H.,Harbin Engineering University | Zheng W.,Harbin Engineering University | Jin Y.S.,Hudong Heavy Machinery Co. | Tian X.N.,Harbin Engineering University
Advanced Materials Research | Year: 2014

In this paper, the model of SCR after-treatment system is established by the software MATLAB and the control strategy for the system is studied also. Based on Eley-rideal mechanism, four major chemical reactions including the adsorption of ammonia, desorption of ammonia, selective catalytic reduction and oxidation of adsorbed ammonia are selected to study the SCR control strategy. Based on the energy conservation law, the equation calculating the temperatureof the layered model is derived. Combinedwith the equations of chemical reaction process,a mathematical model of SCR catalytic converteris established.To achieve a high NOX reduction efficiencyof SCR system, thereasonable and efficacious control strategies for the micro-element models of SCR catalytic is simulated,which including the feedback control strategy based on the feed-forward controller and the PID control strategy. © (2014) Trans Tech Publications, Switzerland.

Loading Hudong Heavy Machinery Co. collaborators
Loading Hudong Heavy Machinery Co. collaborators