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Experimental investigation on traversing hot jet ignition of lean hydrocarbon-air mixtures in a constant volume combustor
Jet Ignition Engine Wave Rotor Combustion
2015/1/12
A constant-volume combustor is used to investigate the ignition initiated by a
traversing jet of reactive hot gas, in support of combustion engine applications that include novel wave-rotor constant-...
Coupled thermal-fluid analysis with flowpath-cavity interaction in a gas turbine engine
CFD FEA Compressor Engine
2015/1/12
This study seeks to improve the understanding of inlet conditions of a large rotor-stator cavity in a turbofan engine, often referred to as the drive cone cavity (DCC). The inlet flow is better unders...
Three-dimensional image analysis for quantification of tooth movements and landmark changes
Orthodontics Dental Image Tooth Movement Three-dimensional
2015/1/12
Quantification of treatment outcomes (tooth displacement and bony changes) is the key to advance orthodontic research and improve clinical practices. Traditionally, treatment outcome were quantified b...
MODELING AND CONTROL OF HYDRAULIC WIND ENERGY TRANSFERS
Hydraulic Transmission System Hydraulic System Modeling Hydraulic System Control
2015/1/12
The harvested energy of wind can be transferred to the generators either through a gearbox or through an intermediate medium such as hydraulic fluids. In this method, high-pressure hydraulic fluids ar...
A Multi-step Reaction Model for Stratified-Charge Combustion in Wave Rotors
Two-Step Reaction Multi-species Model One-Dimensional Euler Equations
2015/1/12
Testing of a wave-rotor constant-volume combustor (WRCVC) showed the viability of the application of wave rotors as a pressure gain combustor. The aero-thermal design of the WRCVC rig had originally b...
Experimental Investigation into Combustion Torch Jet Ignition of Methane-Air, Ethylene-Air, and Propane-Air Mixtures
Torch Jet Hot Gas Jet Ignition Ethylene Methane Propane
2015/1/12
Ignitability and the ignition delay time of a combustible mixture in a long combustion chamber, ignited by a hot combustion torch jet generated in a pre-chamber was investigated experimentally in rela...
MODELING THE INTERDEPENDENCE OF ELECTROCHEMICAL AND MECHANICAL PROPERTIES IN PER SULFONATE ACID PROTON EXCHANGE MEMBRANES
PEM fuel cell membrane Conductivity Measurement
2015/1/12
Proton exchange membrane fuel cells (PEMFC’s) offer an attractive alternative energy resource over traditional fossil fuels. The advantages such as high power density, relatively quick start-up, rapid...
多轴车辆全轮转向液压控制系统设计与分析
全轮转向 液压控制 响应特性
2015/11/4
为进行多轴车辆电液全轮转向系统的研究，设计并建立了转向液压控制系统的数学模型；为提高全轮转向系统的响应性能，基于该模型，在Matlab和AMESim软件中对系统动力执行元件的阶跃响应特性进行了对比分析；结果表明：元件响应时间快、位移大小满足转向传动机构运动情况；且两次仿真结果较为吻合，验证了所建立数学模型的正确性。
针对产品平台设计中的产品模块划分问题,引入稳健设计思想,指出稳健产品平台模块划分就是使产品平台模块划分结果对不可控的客户需求变化不敏感。基于零部件关联度矩阵和表征客户偏好的功能贡献度矩阵,构建了稳健产品平台设计中的准则函数和噪声函数。通过疫苗接种策略改进传统人工免疫算法,对模块划分问题进行多目标优化求解。以多目标优化问题中的非支配解为疫苗,依照二进制基因位选取机制对子代注入疫苗,从而提高子代获得优...
高速履带车辆悬挂装置仿真与耗能分析
履带车 悬挂装置 耗能 RecurDyn
2015/11/3
传统车辆悬挂系统中，阻尼元件以摩擦形式将振动的能量变为热能散发到周围环境中，达到衰减车体振动的作用。该能量不但在行驶过程中耗散掉，还会造成减振器较大热负荷。悬挂性能成为制约车辆越野速度提高的一项重要因素。为了评估这部分能量的大小及影响因素，采用RecurDyn/Track HM模块和Matlab/Simulink对车辆在不同车速不同路面条件下阻尼元件消耗的能量进行计算。结果表明，悬挂阻尼的功率回收...
基于设计理性模型的设计过程知识挖掘
设计理性 设计意图 算法 设计过程挖掘
2015/5/20
针对当前设计理性模型的重用主要集中于检索和浏览而缺乏对模型本身进行深度挖掘这一问题,结合流程挖掘领域的α算法提出给予设计理性模型的设计过程挖掘方法,生成设计过程模型以指导设计者高效完成设计工作。首先通过意图树提取算法消除设计理性模型中的循环、迭代环节生成简洁的设计意图树,然后基于相似度计算和α**算法识别设计意图树中的相同意图和重复意图,最后将设计意图树导出为XES文件,通过α算法挖掘产生设计过程...
瞬态碰撞实验装置缓冲性能仿真
液压缓冲器 三维建模 Simulink仿真 有限元分析
2015/11/3
针对质量块—悬臂梁时变力学实验装置，进行了缓冲器方案设计，该缓冲器主要由缸体、活塞、柱塞杆、端盖、弹簧、注油孔、缓冲液、橡胶垫组成，对各零件进行了设计计算，并在CATIA中对缓冲器各个部件以及装配体进行三维实体建模。对缓冲工作过程进行受力分析，建立了基本的运动受力方程，运用Simulink仿真软件对整个缸体内部的运动过程进行建模，得出了各个部件在缓冲过程中的运动曲线，计算结果表明，该设计方案满足缓...
介绍了以硝酸肼镍为基药制造的刚性电点火头，对基药的选择、点火药的配比和刚性电点火头的制作进行了介绍并对点火头的电性能指标进行了测试，通过串联起爆和机械感度试验，证明用硝酸肼镍为基药制造的刚性电点火头能够满足产品质量和生产安全要求。
Engineering Modeling, Analysis and Optimal Design of Custom Foot Orthotic
Engineering Modeling Analysis Optimal Design Custom Foot Orthotic
2014/10/24
This research details a procedure for the systematic design of custom foot orthotics based on simulation models and their validation through experimental and clinical studies. These models may ultimat...