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2016 7th International Conference on Mechanical and Aerospace Engineering (ICMAE)最新文献

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Maintenance stop time influence on aircraft total maintenane cost with downtime integrated cost model 用停机时间综合成本模型研究停机时间对飞机总维修成本的影响
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549592
R. Saltoglu, Nazmia Humaira, G. Inalhan
Aircraft maintenance cost consists of two elements. The first one is direct maintenance cost and the other one is indirect maintenance cost. The first element includes the costs that are directly related to the maintenance activities such as labor, material, tool and equipment. The second element includes the cost that does not directly affect operator's maintenance budget, which is defined as downtime cost. In most cases, downtime cost is neglected claiming that downtime is a natural fact of maintenance. However, to our surprise, as maintenance period gets longer and the required tools and materials get more complex, downtime starts to cost operator in the same way the maintenance activities do. Therefore, the aim of this study is to examine the elements of maintenance downtime and to what extent they affect the total maintenance cost.
飞机维修费用由两部分组成。一是直接维修成本,二是间接维修成本。第一个要素包括与维护活动直接相关的成本,如人工、材料、工具和设备。第二个要素包括不直接影响作业者维护预算的成本,即停机成本。在大多数情况下,停机成本被忽略,声称停机是维护的自然事实。然而,令我们惊讶的是,随着维护周期的延长,所需的工具和材料变得越来越复杂,停机时间开始以与维护活动相同的方式给运营商带来成本。因此,本研究的目的是研究维修停机时间的要素,以及它们在多大程度上影响总维修成本。
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引用次数: 0
Tensile behaviors after impact of composite scarf joints 复合材料围巾接头冲击后的拉伸行为
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549500
Hengchang Nie, Jifeng Xu, Zhidong Guan, Qian Wang, Zengshan Li
The damage introduced by low-velocity impact is a threat to adhesively bonded composite joints. The impact response and tensile behaviors after impact of composite scarf joints was investigated using experimental and finite element analysis techniques. 18 specimens were impacted in three different locations and tensile tests after impact were conducted. The test results demonstrated that when impacted on the back face of scarf tip, the average dent depth was largest and the average tensile strength after impact was lowest. When impacted in the middle of the bondline slope, the dent depth was smallest and the tensile strength after impact was highest. When impacted on the front face of scarf tip, the dent depth and the tensile strength after impact was mediate. Stress concentration was observed in the scarf tips and areas beside the impact location because of the influence of bending stress and bypass load. The finite element analysis results showed that the extensive expand of fiber damage and adhesive damage lead to catastrophic failure of the whole structure.
低速冲击带来的损伤对粘接复合材料接头是一种威胁。采用试验和有限元分析相结合的方法,研究了复合材料围巾接头的冲击响应和冲击后的拉伸行为。对18个试件在3个不同位置进行冲击,并进行冲击后的拉伸试验。试验结果表明,当冲击到领巾尖端背面时,平均凹痕深度最大,冲击后平均抗拉强度最低。当撞击在粘结线斜坡中间时,凹痕深度最小,冲击后抗拉强度最高。当冲击在领巾前端时,凹痕深度和冲击后的抗拉强度是中间的。由于弯曲应力和旁通载荷的影响,在围护带尖端和冲击位置附近的区域出现了应力集中。有限元分析结果表明,纤维损伤和粘结损伤的广泛扩展导致了整个结构的灾难性破坏。
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引用次数: 7
Structural bionic lightweight design for the stiffened plate of base structure 基础结构加筋板的结构仿生轻量化设计
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549543
Nuo Bao, Jianming Ma, Xingqi Zhang, Zhenghu Zhong
A lightweight bionic design method is proposed to reinforce the structure. The characteristics of leaf vein and honeycomb are investigated to optimize the shape and distribution of the stiffened plate. The structural bionic design for the stiffened plate of base structure is carried out based on biological structure characteristics. Then, a comparison of static performance between initial and bionic structures is conducted to verify the proposed approach by employing finite element analysis. The results show that the mass of the bionic types is reduced by 12.46% and 8.02%, the maximum deformation is reduced by 5.45% and 3.58%, respectively. And thus the validity and applicability of this method is verified.
提出了一种轻量化仿生设计方法对结构进行加固。为了优化加筋板的形状和分布,研究了叶脉和蜂窝的特性。基于生物结构特性,对基础结构加劲板进行了结构仿生设计。然后,通过有限元分析对初始结构和仿生结构的静态性能进行了比较,验证了所提方法的有效性。结果表明,仿生型的质量分别减少了12.46%和8.02%,最大变形量分别减少了5.45%和3.58%。从而验证了该方法的有效性和适用性。
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引用次数: 2
Modeling and controller implementation of tidal turbine for Indian remote islands 印度偏远岛屿潮汐水轮机建模与控制器实现
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549550
Oyendrila Singha, N. Venkatesan, A. Samad, E. Avital
Marine tidal energy extraction faces multi-fold challenges during design, installation, operation and grid-connection. The control of turbine speed with tidal variation is vital to get a steady power output from the turbines during the operation phase throughout the year. This paper deals with the development and implementation of a control strategy for a horizontal axis turbine using the Blade Element Momentum (BEM) approach as the hydrodynamic model and generator (DFIG) control. A control efficiency of 71% is achieved between the system's overall and the hydrodynamic power of a small scale turbine. It is also shown that the generator speed can be well maintained to operate in a super-synchronous mode.
海洋潮汐能提取在设计、安装、运行和并网过程中面临多重挑战。潮汐变化对水轮机转速的控制对于水轮机在全年运行阶段获得稳定的输出功率至关重要。本文研究了利用叶片元动量(BEM)方法作为水动力模型和发电机(DFIG)控制的水平轴水轮机控制策略的开发和实现。该系统的总体控制效率和小型水轮机的水动力控制效率达到71%。结果表明,发电机转速可以很好地保持在超同步模式下运行。
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引用次数: 3
Maintaining model efficiency, avoiding bias and reducing input parameter volume in compressor fault classification 在压缩机故障分类中,保持模型效率,避免偏差,减少输入参数量
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549534
Ann Smith, F. Gu, A. Ball
With the exponential growth in data collection and storage and the necessity for timely prognostic health monitoring of industrial processes traditional methods of data analysis are becoming redundant. Big data sets and huge volumes of inputs give rise to equally massive computational requirements. In this paper the differences in input parameter selection using a subset of the original variables and using data reduction techniques are compared. Each selection procedure being illustrated by both statistical methods and machine learning techniques. It is shown that the subsequent classification models are highly comparable. Finally the merits of a combined multivariate statistical and wavelet decomposition approach is considered. Techniques are applied to output signals from an experimental compressor rig.
随着数据收集和存储的指数级增长以及对工业过程进行及时预测健康监测的必要性,传统的数据分析方法变得多余。大数据集和海量输入产生了同样庞大的计算需求。本文比较了使用原始变量子集和使用数据约简技术在输入参数选择方面的差异。每个选择过程都用统计方法和机器学习技术来说明。结果表明,后续的分类模型具有很强的可比性。最后讨论了多元统计与小波分解相结合的方法的优点。将技术应用于压缩试验台的输出信号。
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引用次数: 2
Structural optimization of a flapping wing micro air vehicle 扑翼微型飞行器的结构优化
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549587
T. Truong, Marcro Debiasi, U. Kureemun, H. Lee
The development of flapping wing micro air vehicles (MAVs) have yielded remarkable progress over the last decades. Achieving high component stiffness is often in conflict with low weight requirement, which is highly desirable for longer flight time and higher payload. Moreover, the vibration originated predominantly from the wings, the gears and the frame excitations, compromises the flapping wing MAV's stability and the fatigue life. In order to improve the vehicle's efficiency and performance, optimization of these various parameters is necessary. In this work, we present the structural optimization of the flapping wing micro air vehicles. Specifically, we focus on the gearbox optimization using Simulia Tosca Structure in Abaqus, which is a robust tool for designing lightweight, rigid and durable components. The various numerical experiments have been conducted towards optimizing the components' topology. The results provide understanding of the optimal design topology for a spur gear and the structural components used in MAVs.
扑翼微型飞行器(MAVs)的发展在过去的几十年里取得了显著的进展。实现高刚度往往与低重量要求相冲突,而低重量要求是更长的飞行时间和更高的有效载荷所迫切需要的。振动主要来源于机翼、齿轮和车架的激振,影响了扑翼飞行器的稳定性和疲劳寿命。为了提高车辆的效率和性能,必须对这些参数进行优化。本文研究了扑翼微型飞行器的结构优化问题。具体来说,我们专注于使用Abaqus中的Simulia Tosca Structure对齿轮箱进行优化,这是一个设计轻质,刚性和耐用部件的强大工具。为了优化元件的拓扑结构,进行了各种数值实验。研究结果为MAVs中使用的正齿轮和结构部件的最佳设计拓扑提供了理解。
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引用次数: 3
The introduction of a tilted volute design for operation with a mixed flow turbine for turbocharger applications 引入了一个倾斜的蜗壳设计的操作与混合流涡轮涡轮增压器的应用
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549528
S. P. Lee, M. Jupp, A. K. Nickson
This paper introduces a tilted volute design for operation with a mixed flow turbine rotor. CFD results show an efficiency gain of up to 1.2% over the standard radial design at the highest tested turbine rotational speed. The efficiency gain was found to be the result of a reduction in separation from the blade suction surface. A reduction in the flow cone angle was also observed for the tilted housing, as a result an increase in negative incidence angles at the blade LE was observed. This work shows that optimization of the turbine housing specifically for mixed flow applications can yield significant performance benefits.
本文介绍了一种用于混流涡轮转子运行的倾斜蜗壳设计。CFD结果表明,在最高测试涡轮转速下,效率比标准径向设计高出1.2%。效率的提高是由于减少了与叶片吸力面的分离。在倾斜的壳体中还观察到流锥角的减小,因此观察到叶片LE处的负入射角增加。这项工作表明,优化涡轮壳专门为混合流应用可以产生显著的性能效益。
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引用次数: 1
Partially-averaged navier-stokes method for turbulence simulations: A jet injected into a supersonic crossflow 紊流模拟的部分平均纳维-斯托克斯方法:注入超音速横流的射流
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549597
R. Du, Chao Yan, Huafeng Yu, Zheng Han
Partially-averaged Navier-Stokes (PANS) method, as a bridging method between Reynolds-averaged Navier-Stokes (RANS) and direct numerical simulation (DNS), has attracted many researchers' attentions in recent years. In this paper, PANS is extended to the simulations of a jet injected into a supersonic crossflow. A dynamic function of the resolution control parameter fk (unresolved-to-total ratio of kinetic energy) is adopted. Numerical results are compared to the experimental data and the performance of PANS is evaluated. The predictions of dynamic fk PANS overall agree well with the measurements and the instantaneous flow filed is provided. In addition, the distribution of fk is presented to have a better understanding of the method's scale resolving behavior throughout the computation domain. Current study has shown the capabilities and potential of PANS method for supersonic industrial flows.
部分平均Navier-Stokes (PANS)方法作为reynolds -average Navier-Stokes (RANS)和直接数值模拟(DNS)之间的桥梁方法,近年来受到了许多研究者的关注。本文将PANS扩展到超声速横流射流的模拟中。采用分辨率控制参数fk(未解析总动能比)的动态函数。将数值结果与实验数据进行了比较,并对PANS的性能进行了评价。动态fk - pan的预测结果与实测结果基本吻合,并给出了瞬时流场。此外,还给出了fk的分布,以便更好地理解该方法在整个计算域中的尺度解析行为。目前的研究已经证明了pan方法在超声速工业流动中的能力和潜力。
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引用次数: 0
Modal stability assessment for a morphing aileron subjected to actuation system failures: Numerical analysis supported by test evidence 致动系统失效时变形副翼模态稳定性评估:有试验证据支持的数值分析
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549580
M. Arena, M. Noviello, F. Rea, F. Amoroso, R. Pecora, G. Amendola
The meaningful growth process and the exponential development related to aircraft industry has currently introduced new requirements concerning the fuel burn reduction and the noise emitted. The awareness on meeting the comfort targets implied a significant evolution of the assessments in aircraft design, aimed at reducing the problems that have emerged in empirical investigations. The aircraft renewal process involves targeted technical choices both to careful observance of safety as to the market requirements. In the current “low-noise” research scenario on a global scale, the morphing technology is playing a dominant role for the many benefits available in the greening of the next generation air transport. The research project CRIAQ-MDO505, born by an intense synergy among industries, research centers and universities has allowed for investigating morphing structures potentials through the design and manufacturing of a variable camber aileron tailored for CS-25 category aircraft applications. In this framework, the authors focused on the setup of an advanced finite element model (FEM) and on its validation through ground resonance tests performed on a true-scale prototype. A very good correlation between numerical and experimental modal parameters was proven thus showing the adequacy of the adopted modelling strategies as well as the reliability of the FEM. Relying upon the validated FEM, sensitivity modal analyses were carried out to evaluate the stability of results with respect to single and combined failures of the actuation line enabling morphing. Modal parameters pertinent to each failure scenario were arranged into a rational database for further studies on the aero-servo-elastic behavior of the morphing system.
航空工业的有意义发展和指数式发展,对降低燃油消耗和噪声排放提出了新的要求。对满足舒适目标的认识意味着飞机设计评估的重大演变,旨在减少实证调查中出现的问题。飞机更新过程涉及有针对性的技术选择,既要仔细遵守安全和市场要求。在目前全球范围内的“低噪音”研究场景中,变形技术在下一代航空运输的绿色化中发挥着主导作用。CRIAQ-MDO505研究项目是由工业、研究中心和大学之间的强烈协同作用产生的,通过设计和制造为CS-25类飞机定制的可变弧度副翼,可以研究变形结构的潜力。在此框架下,作者着重于建立一个先进的有限元模型(FEM),并通过在真尺寸原型上进行的地面共振试验对其进行验证。数值模态参数与试验模态参数之间具有很好的相关性,从而表明所采用的建模策略的充分性以及有限元法的可靠性。基于验证的有限元方法,进行了灵敏度模态分析,以评估导致变形的驱动线的单个和组合失效对结果的稳定性。将与每种失效情况相关的模态参数整理成合理的数据库,以便进一步研究变形系统的气动伺服弹性行为。
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引用次数: 16
Flow feature around an in-line forced oscillating circular cylinder with splitter plate in low reynolds number 低雷诺数带分流板的直线强迫振荡圆柱的流动特性
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549556
Y. Yokoi
In order to understand the flow feature around an in-line forced oscillating circular cylinder with splitter plate (splitter plate ratio SL/d = 2.0), numerical and visual experiments were performed. As a result, even if it was the case of circular cylinder with splitter plate, the lock-in phenomenon arises. The characteristics of fluid force and typical flow patterns were obtained. It was found that an existence of re-circulation flow supplied to the separating shear layer is important in formation of the vortex shedding flow.
为了了解带分流板(分流板比SL/d = 2.0)的直线强迫振荡圆柱的流动特性,进行了数值和视觉实验。因此,即使是带分流板的圆柱,也会出现锁紧现象。得到了流体受力特性和典型流态。研究发现,供给分离剪切层的再循环流的存在是形成旋涡脱落流的重要条件。
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引用次数: 0
期刊
2016 7th International Conference on Mechanical and Aerospace Engineering (ICMAE)
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