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Matching analysis of combined charging of an opposed-piston two-stroke engine

Journal of Beijing Institute of Technology 2015年第1期24卷 58-64页

作者：董雪飞赵长禄张付军赵振峰吴滔滔 Fundamental Science on Vehicular Power System Laboratory Beijing Institute of Technology

To experimentally match performance and structural features of an opposed-piston two- stroke engine （ OPTSE ）, two calculation models, a one-dimensional （ 1-D ） model and a three-di- mensional （3-D） model, of the combined charging matching simulation of an OPTSE was established by using the GT-Power software. To test and verify the one dimensional model, the three-dimension- al computational fluid dynamics simulation model was established using AVL FIRE software. Cylinder pressure curves in these two models match perfectly, showing that it is reasonable to use the one-di- mensional model to simulate the work process of an OPTSE. Moreover, the effects of delivery ratio, nozzle ring diameter and exhaust back pressure on brake specific fuel consumption （ BSFC ） were studied.

关键词： opposed-piston combined charging uniflow scavenging delivery ratio exhaust backpressure

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Relationship between erosion and sediment yield in drainage basins of loess gully-hilly areas

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Journal of Geographical Sciences 2001年第1期11卷 71-79页

作者： CHEN Hao (Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China) Institute of Geographic Sciences and Natural Resources Research CAS Beijing China

From a long-term point of view, the balance between erosion and sediment yield in a drainage system can basically realize, i.e., the delivery ratio can be close to 1. However, substantial variations among individual rainfall events or between annual delivery ratio exist, causing frequent sediment retaining or re-erosion and re-delivery of the retained sediments in a short period of time. Thus the delivery ratio will be 1. The sediment delivery ratio is closely related to the spatial distribution of rainfall and magnitude of rise and fall of peak flood and that of runoff depth in the drainage system. delivery ratio of single event in a drainage system and changes of delivery capacity of silt-laden runoff in various classes of gullies can be expressed by transformation mechanism of shear force of a single rainstorm event with flood resulting from increase and decrease of peak flood per unit area.

关键词： delivery ratio interaction flood and geomorphology dynamic mechanism rainstorm flood

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Experimental investigation of performance improving and emissions reducing in a two stroke SI engine by using ethanol additives

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Propulsion and Power Research 2013年第4期2卷 276-283页

作者： Mohsen Ghazikhani Mohammad Hatami Behrouz Safari Davood Domiri Ganji Ferdowsi University of Mashhad Engineering FacultyMechanical Engineering DepartmentIran Esfarayen University Engineering and Technical CollegeMechanical Engineering DepartmentEsfarayenNorth KhorasanIran Babol University of Technology Mechanical Engineering DepartmentMazandaranBabolIran

In present study,the operational parameters for a two stroke gasoline engine such as delivery ratio,scavenging efficiency,trapping efficiency,*** been investigated experimentally when its fuel is blended with ethanol *** the amounts of emitted pollutants(HC,CO,CO_(2)and NO_(X))from this engine are measured in various engine velocity and *** experiments,ethanol is combined with gasoline in different percentages of 5%,10%and 15%.The experiments have been done for 2500,3000,3500 and 4500 *** results show that in most test cases,when alcoholic fuel is used,scavenging efficiency and delivery ratio increased due to rapid evaporation of ethanol,but fuel converging efficiency and brake specific fuel consumption(BSFC)*** most outstanding result of using ethanol additive is significant reduction in pollutions emitted from engine and CO with 35%reduction has the most reduction percentage among other pollutants.

关键词： Two strokeengine Ethanol additives delivery ratio Scavenging efficiency Emissions

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An empirical study of DSRC V2V performance in truck platooning scenarios

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Digital Communications and Networks 2016年第4期2卷 233-244页

作者： Song Gao Alvin Lim David Bevly Department of Computer Science and Software Engineering 3101 Shelby Center U.S. Department of Mechanical Engineering 2418F Wiggins Hall U.S. Auburn University Auburn AL 36849 U.S.

Among many safety applications enabled by Dedicated Short Range Communication (DSRC), truck platooning provides many incentives to commercial companies. This paper studies DSRC Vehicle-to-Vehicle (V2V) performance in truck platooning scenarios through real-world experiments. Commercial DSRC equipments and semi-trailer trucks are used in this study. We mount one DSRC antenna on each side of the truck. One set of dynamic tests and a few sets of static tests are conducted to explore DSRC behaviors under different situations. From the test results, we verified some of our speculations. For example, hilly roads can affect delivery ratio and antennas mounted on opposite sides of a truck can suffer from low delivery ratio at curved roads. In addition, we also found that antennas can sometimes suffer from low delivery ratio even when the trucks are on straight roads, possibly due to reflections from the nearby terrain. Fortunately, the delivery ratio can be greatly improved by using the two side antennas alternately.

关键词： Empirical study DSRC V2V performance Truck platooning delivery ratio

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Efficient Routing Protocol Based on Security for Wireless Sensor Networks

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Circuits and Systems 2016年第8期7卷 1943-1953页

作者： S. Nandhakumar Dr. N. Malmurugan Department of Computer Science Engineering Dhanalakshmi Srinivasan Engineering College Perambalur India Department of Electronics and Communication Engineering Mahendra College of Engineering Salem India

Nowadays, the major part and most standard networks usually used in several applications are Wireless Sensor Networks (WSNs). It consists of different nodes which communicate each other for data transmission. There is no access point to control the nodes in the network. This makes the network to undergo severe attacks from both passive and active devices. Due to this attack, the network undergoes downgrade performance. To overcome these attacks, security based routing protocol is proposed with the security based wormhole detection scheme. This scheme comprises of two phases. In this approach, the detection of wormhole attacks is deployed for having correct balance between safe route and stability. Also, to ensure packets integrity cryptographic scheme is used as well as authenticity while travelling from source to destination nodes. By extensive simulation, the proposed scheme achieves enhanced performance of packet delivery ratio, end to end delay, throughput and overhead than the existing schemes.

关键词： WSNS Throughput Integrated Cryptography Scheme delivery ratio Packet Loss Authentication Data Integrity Communication Overhead and End to End Delay

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