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

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Investigation on forced vibration response of micro rubber/nano silica added carbon composite beams for structural applications 结构用微橡胶/纳米二氧化硅加碳复合梁的强迫振动响应研究
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549507
C. Kannan, R. Ramesh, Rishi S. Vaidya, B. Vijayaram
Suppression of vibration is one of the functional requirement in structures subjected to dynamic conditions like machine tools, automobile parts etc. To impart increased dynamic stiffness and strength to woven fabric carbon epoxy composite structures, micro rubber particles of average size 5μm and 20nm nano silica particles were added and its dynamic response was evaluated by experimental forced vibration study. The carbon epoxy composite beams were compared with carbon composite containing 9 wt. % of micro rubber particles and 11wt. % of nano silica particles. Carbon epoxy beams were fabricated by hand layup method by considering Box and Channel cross sectional shape. A fiber volume fraction of 40% and a matrix volume fraction of 60% were preferred as a composition for all considered beams. Six-layered carbon/epoxy beam with uniform cross-sectional area, height to width ratio, and moment of inertia were considered. Forcing sine wave motion was given to the composite beams through higher order stinger which is connecting between free end of the beam and electrodynamic shaker. The forced vibration test was conducted for the frequency range from 50 to 80 Hz with two different forcing amplitudes of 0.05 mm and 0.1mm. The responses show the variation in dynamic performance of carbon when compared with dedicated carbon beam. Closed cross sectional box shape shows improved performance than open channel shaped beam under forced vibration condition.
在机床、汽车零部件等受动力作用的结构中,抑制振动是其功能要求之一。为了提高机织碳环氧复合材料结构的动态刚度和强度,分别加入平均尺寸为5μm的微橡胶颗粒和20nm的纳米二氧化硅颗粒,并通过实验强迫振动研究来评估其动态响应。将碳环氧复合材料梁与含有9%微橡胶颗粒的碳复合材料梁和含有11wt. %微橡胶颗粒的碳复合材料梁进行了比较。%的纳米二氧化硅颗粒。考虑箱体和沟槽的截面形状,采用手工叠层法制备环氧碳梁。优选40%的纤维体积分数和60%的基体体积分数作为所有考虑的光束的组合物。考虑了具有均匀横截面积、高宽比和惯性矩的六层碳/环氧树脂梁。通过连接梁自由端与电动激振器之间的高阶推力杆,对组合梁进行强制正弦波运动。在50 ~ 80 Hz频率范围内进行强迫振动试验,强迫振幅分别为0.05 mm和0.1mm。与专用碳梁相比,碳梁的动态性能发生了变化。在强迫振动条件下,封闭截面箱形梁的性能优于开槽型梁。
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引用次数: 1
Properties of TRIP/TWIP steel with different aluminium levels upon annealing 不同铝含量TRIP/TWIP钢退火后的性能
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549519
P. Martínek, P. Podaný, M. Koukolíková, J. Dlouhý, M. Duchek
This paper deals with heat treatment of a manganese TRIP/TWIP steel containing various aluminium levels. Two heats were made with identical chemical compositions, apart from different aluminium levels: 0.4 and 1.4 wt. %. Cold-rolled sheets were made using a route in which the last forming operation involved 40 % reduction, and then annealed. The annealing times were 1, 2, and 3 hours. On the specimens taken from the annealed sheets, microstructures were examined and grain size, phase fractions and hardness were measured. These results were compared between the two heats to identity the impact of the aluminium level on properties of this steel. In addition, the results were compared with the data for the initial condition of the materials.
本文研究了含不同铝含量的TRIP/TWIP锰钢的热处理。除了铝含量不同外,用相同的化学成分制成了两种加热材料:0.4和1.4 wt. %。冷轧薄板采用的路线,其中最后成形操作涉及40%的减少,然后退火。退火时间分别为1、2、3小时。对退火后的试样进行了显微组织检查,并测量了晶粒尺寸、相分数和硬度。将这些结果在两种温度之间进行比较,以确定铝含量对该钢性能的影响。并将所得结果与材料初始状态的数据进行了比较。
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引用次数: 0
An improved partitioning strategy for structured multiblock grids 一种改进的结构化多块网格划分策略
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549559
Hongkang Liu, Chao Yan, Yatian Zhao, Bo-xi Lin
Load balancing is one of the critical factors affecting the performance of parallel computing. An improved partitioning strategy is proposed for structured multiblock grids here. The new subgrid-splitting approach, together with a recursive graph-partitioning algorithm, is to seek a good load balancing as less blocks as possible. Two typical applications are implemented to validate the strategy. Results demonstrate that the new partitioning strategy behaves well in load balancing and communication overheads, and furthermore manifests an excellent performance in decreasing the amount of blocks, as well as the memory requirement caused by the multiplication of ghost cells near the edge.
负载平衡是影响并行计算性能的关键因素之一。针对结构化多块网格,提出了一种改进的分区策略。新的子网格分割方法与递归图分区算法一起,寻求尽可能少的块的良好负载平衡。实现了两个典型的应用程序来验证该策略。结果表明,新的分区策略在负载平衡和通信开销方面表现良好,并且在减少块数量以及边缘附近幽灵细胞乘法引起的内存需求方面表现出优异的性能。
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引用次数: 3
Flow and heat transfer analysis of variable diameter circular pillar disc brake rotor using CFD 基于CFD的变直径圆柱盘式制动器转子流动传热分析
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549525
C. Mahesh, A. Valavade
In the present work, ventilated disc brake rotors with variable diameter circular pillar configurations were analyzed to enhance the heat dissipation and obtain more uniform temperature distribution in the rotor. CFD code used in this work was validated with experimental results obtained by conducting experiments on a test rig. Experimental analysis was performed on existing taper radial vane (TRV) rotor to calculate the mass flow rate and heat transfer coefficient. Further, variable diameter circular pillar (VDCP) rotor with different configurations namely VDCP1, VDCP2 and VDCP3 were considered for the analysis. A 20° segment of rotor was considered for the numerical analysis due to its rotational symmetry. CFD results were in good agreement with the experimental analysis. The maximum deviation of numerical results were about 15% from the experimental results. It is found from the analysis that among all the rotor configurations; VDCP1 rotor configuration gives better rate of heat dissipation and more uniform temperature distribution in the rotor. Hence for modern high speed vehicles VDCP1 rotor configuration may be more appropriate.
本文对采用变直径圆柱结构的通风盘式制动器转子进行了分析,以提高散热性能,使转子内温度分布更加均匀。通过在试验台上的实验,验证了所使用的CFD代码的有效性。对现有的锥形径向叶片(TRV)转子进行了实验分析,计算了质量流量和换热系数。进一步考虑了VDCP1、VDCP2和VDCP3三种不同构型的变直径圆柱转子(VDCP)进行分析。考虑转子20°段的旋转对称性,对其进行数值分析。CFD计算结果与实验结果吻合较好。数值结果与实验结果的最大偏差约为15%。分析发现,在各种转子构型中;VDCP1转子配置具有更好的散热率和更均匀的转子温度分布。因此,对于现代高速车辆,VDCP1转子配置可能更合适。
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引用次数: 7
Damage tolerance coupon sizing of composite stiffened panels under impact 复合材料加筋板在冲击作用下的损伤容限尺寸
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549510
H. Dalir
The design of aircraft composite stiffened structures subjected to dynamic and impact loadings requires several experimental testing scenarios on the full-size structure. The present paper deals with investigating the feasibility of the use of sub-size test specimens under vertical and lateral impacts on the stiffener free flange based on finite element (FE) models. Simulations were performed on sub-size specimens carefully extracted from the full-size (26.4 × 48.4 × 2.4 in3) impact test panels. The main required specifications of an in-house falling weight impact tester were also determined, discussing the required fixture/jig configuration.
飞机复合材料加筋结构在动力和冲击载荷作用下的设计需要在全尺寸结构上进行多种试验测试。本文研究了基于有限元模型的加劲肋无翼缘在竖向和侧向冲击下采用分尺寸试样的可行性。对从全尺寸(26.4 × 48.4 × 2.4英寸)冲击试验板上仔细提取的亚尺寸试样进行了模拟。还确定了内部落锤冲击试验机的主要要求规格,讨论了所需的夹具/夹具配置。
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引用次数: 0
Rotor dynamics analysis and experimental research of flywheel shafting with a single point flexible support 单点柔性支承飞轮轴系转子动力学分析与试验研究
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549574
Tang Changliang, Yang Jinfu, Han Dongjiang, Lei Huan
The flywheel energy storage technology is a new type of conversion and storage for electric energy, and it is also a research hotspot of energy field in the world. There are a large number of studies on dynamic characteristics of energy storage flywheel in recent years. The flexible support with a single point has small load-carrying ability but very low friction loss, which is appropriate to be used in small flywheel system. For this reason, a flywheel shafting with a single point flexible support was established. By means of the Lagrangian equation, the special dynamic model of the flywheel rotor-bearing-damper was built to calculate critical speed, modal shape and modal damping ratio with different speed. The results show that shafting is stable, simple and efficient. And the experimental result is in agreement with the theoretical one.
飞轮储能技术是一种新型的电能转换与存储技术,也是当今世界能源领域的研究热点。近年来对储能飞轮的动态特性进行了大量的研究。单点柔性支承承载能力小,但摩擦损失很低,适合用于小型飞轮系统。为此,建立了一种单点柔性支撑飞轮轴。利用拉格朗日方程建立了飞轮转子-轴承-阻尼器的特殊动力学模型,计算了不同转速下的临界转速、模态振型和模态阻尼比。结果表明,该轴系稳定、简单、高效。实验结果与理论结果吻合较好。
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引用次数: 0
Flame response of solid laminate propellant AP/HTPB to pressure perturbations 固体层压板推进剂AP/HTPB对压力扰动的火焰响应
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549532
H. Rezaiguia, Peijin Liu
The experimental work presented in this paper deals with the flame response of a solid laminate propellant AP/HTPB to pressure perturbations. Experiments were performed in closed tube pressurized under 1MPa. The pressure perturbations are created by a pulser system connected to the end of the combustion chamber. The combustion process of a three layers of AP/HTPB was recorded by using a microscope and a high speed camera. The qualitative analysis of the flame images of the two cases, with and without pressure fluctuations, revealed that the standing acoustic waves established in the tube has strongly affected the flame and the combustion products flow. The flame response was translated by an oscillation motion above the burning surface. Thus, the burning surface profile was changed which means that the regression rate value may fluctuate.
本文研究了固体层压板推进剂AP/HTPB在压力扰动下的火焰响应。实验在压力为1MPa的密闭管内进行。压力扰动是由连接到燃烧室末端的脉冲发生器系统产生的。利用显微镜和高速摄像机记录了三层AP/HTPB的燃烧过程。定性分析了两种情况下有压力波动和无压力波动的火焰图像,发现在管内建立的驻声波对火焰和燃烧产物流动有强烈的影响。火焰响应由燃烧表面上方的振荡运动转化而来。因此,燃烧表面轮廓发生了变化,这意味着回归速率值可能会波动。
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引用次数: 2
Research on anti-radiation weapon confronting active decoys based on Doppler frequencies difference 基于多普勒频差的反辐射武器对抗有源诱饵的研究
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549547
Jianbin Zou, K. Gao, Jie Yang, Jiang Zhu
For the weakness of passive radar seeker (PRS), anti-radiation weapons (ARW) could be jammed easily by two decoys with same frequency. Compared with the high complexity of actualization of traditional angle differentiation methods, a method based on Doppler frequency difference (DFD) of received decoys' signals is presented to distinguish jamming decoy sources with the same frequencies, which has low complexity and easily be actualized. Factors that affect DFD are analyzed in detail. Then differentiation region of PRS telling decoys apart is analysed. The simulation results prove that this method can improve the ability of anti-radiation weapon confronting active decoys effectively.
由于无源雷达导引头(PRS)的弱点,反辐射武器(ARW)很容易被两个相同频率的诱饵干扰。针对传统角度区分方法实现复杂的缺点,提出了一种基于接收诱饵信号的多普勒频差(DFD)识别同频率干扰诱饵源的方法,该方法具有复杂度低、易于实现的特点。详细分析了影响DFD的因素。然后分析了PRS区分诱饵的区分区域。仿真结果表明,该方法能有效提高反辐射武器对抗有源诱饵的能力。
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引用次数: 0
GBAS protection level calculation with GARCH model 用GARCH模型计算GBAS防护等级
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549614
Kun Fang, R. Xue, Yanbo Zhu
To eliminate the time correlation and model the heavy distribution tail of ground based augmentation system (GBAS) errors, a method utilizing generalized autoregressive conditional heteroscedasticity (GARCH) model is introduced in this paper. Considering the statistical uncertainty of model parameters, a strategy for using the GARCH model in nonstationary situations is proposed. Based on that, a protection level calculation framework is established with an online/offline structure to calculate error overbound and protection level in real time. As the heavy-tail errors are normalized to standard Gaussian distribution, and all the normalized errors from different satellites and elevation groups are mixed together to calculate Gaussian overbound, the Gaussian overbound is much tighter than the one calculated by classic heavy-tail errors. That leads to smaller protection levels and higher system availability.
为了消除地面增强系统(GBAS)误差的时间相关性并对其重分布尾进行建模,提出了一种利用广义自回归条件异方差(GARCH)模型的方法。考虑到模型参数的统计不确定性,提出了GARCH模型在非平稳情况下的应用策略。在此基础上,建立了在线/离线结构的防护等级计算框架,实时计算误差越界和防护等级。由于将重尾误差归一化为标准高斯分布,并将不同卫星和高程组的归一化误差混合在一起计算高斯过界,因此高斯过界比经典重尾误差计算的高斯过界要严密得多。这将导致更小的保护级别和更高的系统可用性。
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引用次数: 1
Residual stress test and simulation of incremental hole drilling method 增量钻孔法残余应力试验与模拟
Pub Date : 2016-07-18 DOI: 10.1109/ICMAE.2016.7549546
Min Wang, Yunan Liu, Tao Zan, Xiang-sheng Gao, Yanlin Zhang
Residual stress of thin-walled blanks with complex cavity structure is an important influence factor on the stability of machining. The most residual stress testing technologies is only suitable to measure residual stress of surface or shallow surface. It is difficult to ensure the accuracy to measure residual stress inside workpiece. In order to study the reliability and accuracy of incremental hole drilling method measuring interior residual stress, according to residual stress test for casting ZL205A aluminum alloy tapered thin-walled blank, finite element (FE) model with initial residual stress is established to simulate incremental hole drilling on the platform of ANSYS. Then error and the rationality of the finite element simulation model has been analyzed by comparing the simulation stress value with the test. The results indicate that the incremental hole drilling method has some errors to measures residual stress inside workpiece. The method is only suitable to measure surface residual stress.
具有复杂型腔结构的薄壁毛坯的残余应力是影响加工稳定性的重要因素。大多数残余应力测试技术只适用于测量表面或浅层表面的残余应力。工件内部残余应力的测量精度难以保证。为了研究增量钻孔法测量内部残余应力的可靠性和准确性,根据铸造ZL205A铝合金锥形薄壁毛坯残余应力试验,在ANSYS平台上建立初始残余应力的有限元模型,模拟增量钻孔过程。然后通过仿真应力值与试验值的比较,分析了有限元仿真模型的误差和合理性。结果表明,增量钻孔法测量工件内部残余应力存在一定误差。该方法仅适用于测量表面残余应力。
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引用次数: 1
期刊
2016 7th International Conference on Mechanical and Aerospace Engineering (ICMAE)
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