船舶清洁能源动力装置与系统发展分析

<正>各种清洁能源在船上的应用促进着船舶动力装置与系统的变革和创新。近年来,业界开展了大量船舶应用清洁能源相关研究及实践。天然气内燃机技术已趋于成熟且已积累了较丰富的实船应用经验,甲醇燃料内燃机在甲醇运输船、渡轮等船型上已有少量工程实践,柴油-氢双燃料内燃机在小型客船上已有应用案例,氨燃料内燃机也正计划开展原理样机研发。     

An investigation of the performance of an electronic in-line pump system for diesel engines

WIT Electronic Fuel System Co., Ltd. has developed a new fuel injector, the Electronic In-line Pump （EIP） system, designed to meet China＇s diesel engine emission and fuel economy regulations. It can be used on marine diesel engines and commercial vehicle engines through different EIP systems. A numerical model of the EIP system was built in the AMESim environment for the purpose of creating a design tool for engine application and system optimization. The model was used to predict key injection characteristics under different operating conditions, such as injection pressure, injection rate, and injection duration. To validate these predictions, experimental tests were conducted under the conditions that were modeled. The results were quite encouraging and in agreement with model predictions. Additional experiments were conducted to study the injection characteristics of the EIP system. These results show that injection pressure and injection quantity are insensitive to injection timing variations, this is due to the design of the constant velocity cam profile. Finally, injection quantity and pressure vs. pulse width at different cam speeds are presented, an important injection characteristic for EIP system calibration.     

电控柴油机动力系统窜振控制策略研究

根据窜振时发动机转速波动特点设计了滤波器,提取出了窜振特征信息并设计了抑制算法;进一步将算法扩展为基于变采样周期的递推式,使之能应用于喷射控制过程的油量修正;通过对发动机转速波动频率的分析,避免了油量过度修正引起的发动机高频抖动。试验结果表明加速过程的传动系窜振现象能够被有效抑制。     

21世纪轿车理想的动力装置--GDI发动机

汽油直接喷射（Gasoline Direct Inieetion）发动机简称GDI发动机,是近年来国外内燃机研究与开发的热点。专家认为,汽油机直喷技术的出现,使汽车发动机技术进入了一个崭新的时代,它在21世纪有取代传统汽油机和柴油机的趋势,成为轿车最理想的动力装置。     

潜艇降噪效果模糊综合评估

以模糊数学理论为基础，运用模糊数学的综合评判工具建立数学模型，对潜艇噪声控制的影响因素与影响效果之间的关系进行分析，对潜艇的降噪影响各因素的综合效果有所了解，从而对潜艇的降噪效果进行模糊综合评估。