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Design and Experiment of a Replant Crops Separating Garlic Harvester 复种分离式大蒜收割机的设计与试验
Pub Date : 2018-04-30 DOI: 10.2174/1874155X01812010067
Zhonglai Tian, Ying Zhao, Yongxiang Sui, Jialin Hou, Qun Sun, Chong Wang, Zhenyou Wang, Ling Zhao
Methods: Firstly, the three-dimensional model of the whole machine and the key mechanism is established and the parameters of the system are calculated by theoretical calculation. Then, the simulation be made and the design be optimized. Finally, the design was processed into a product. It employs an isolation mechanism and positioned cutting mechanism to isolate garlic and crop stubbles and keep the length of the remaining garlic straw consistent.
方法:首先建立整机及关键机构的三维模型,并通过理论计算对系统参数进行计算。然后进行了仿真,并对设计进行了优化。最后将设计加工成产品。采用隔离机构和定位切割机构,隔离大蒜和作物残茬,保持剩余大蒜秸秆长度一致。
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引用次数: 3
Design and Development of Power Transmission System for Green and Light Weight Vehicles: A Review 绿色轻量化汽车动力传动系统设计与开发综述
Pub Date : 2018-04-30 DOI: 10.2174/1874155X01812010081
Hailemariam Nigus Hailu, D. T. Redda
Abstract: A study on green vehicle was introduced and promoted to minimize the problem of air pollution caused by emissions of conventional vehicle. Green mobility are vehicles with low fuel/energy consumption and low/zero exhaust gas emission, these vehicles are like hybrid, battery powered, and fuel cell electric vehicle that can be enhanced to be more efficient than the conventional vehicles through a new design and development of power transmission system. Power transmission system for green and lightweight vehicles consists of different components like gear box, propeller shaft, differential and final drive. In this review more emphasis is given to gear box due to some reasons: firstly, it is one of the heaviest component of the power train system and as a result weight reduction is critically needed to increase the efficiency of the vehicle. Secondly, gearshift takes place therefore, torque interruption needs to minimize. The use of simulation software's i. e. Mat lab, AMEsim, cruise software and other similar programs can simulate high-efficiency power transmission system. The results from the simulation software will be validated by experimental tests on test rigs. One way of minimizing fuel consumption is to reduce the weight of the gearbox by 10% reduction in vehicle weight can improved fuel economy by about 5-7%. As different researchers confirm that to have high vehicle efficiency the type of the transmission they used matters. A vehicle using automated manual transmission (AMT) and dual clutch transmission is more efficient in terms of less energy loss and gearshift comfort.
摘要:为了最大限度地减少传统汽车尾气排放对大气的污染,引入并推动了绿色汽车的研究。绿色交通是低燃料/能源消耗和低/零废气排放的车辆,这些车辆就像混合动力,电池动力和燃料电池电动汽车,可以通过新的设计和开发动力传输系统来提高比传统车辆的效率。绿色轻量化汽车动力传动系统由齿轮箱、传动轴、差速器、终驱等不同部件组成。由于以下原因,本文将重点介绍齿轮箱:首先,它是动力传动系统中最重的部件之一,因此迫切需要减轻重量以提高车辆的效率。其次,因此换档时,扭矩中断需要最小化。利用仿真软件如Mat lab、AMEsim、cruise软件等类似程序可以对高效动力传动系统进行仿真。仿真软件的结果将通过试验台的实验测试进行验证。减少燃料消耗的一种方法是将变速箱的重量减少10%,减少车辆重量可以提高燃油经济性约5-7%。正如不同的研究人员证实的那样,为了提高车辆的效率,他们使用的变速器的类型很重要。使用自动手动变速器(AMT)和双离合变速器的车辆在能量损失和换挡舒适性方面效率更高。
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引用次数: 7
Performance Evaluation of Mechanical Power Amplifier for Various Belt Materials 各种皮带材料的机械功率放大器性能评价
Pub Date : 2018-04-30 DOI: 10.2174/1874155X01812010095
S. Gawande
Received: March 02, 2018 Revised: March 20, 2018 Accepted: April 24, 2018 Abstract: Background: In many applications, it is required to control a large output load using a relatively low control force. To satisfy such purposes, a device like mechanical power amplifier can be used which generally gives a very fast response. As per the requirement of the system, power can be instantaneously available from continuously rotating drums of the mechanical power amplifier.
摘要:背景:在许多应用中,需要用相对较低的控制力来控制较大的输出负载。为了满足这样的目的,可以使用像机械功率放大器这样的设备,它通常会给出非常快的响应。根据系统的要求,可以从机械功率放大器的连续旋转鼓中瞬时获得功率。
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引用次数: 1
Joint Probability Distribution Functions for the Filtered Velocity Gradient Invariants in Homogeneous Isotropic Turbulence 均匀各向同性湍流中过滤速度梯度不变量的联合概率分布函数
Pub Date : 2018-02-15 DOI: 10.2174/1874155X01812010054
W. A. Kareem, M. A. Aty, Zafer M. Asker
Methods: The Fourier decomposition and the anisotropic diffusion model are used in the investigation. The extraction process is performed by employing the Fourier decomposition at different cutoff wavenumbers for the velocity field and three distinct scales (large, medium and fine scale) are identified. The velocity gradient invariants such as the second invariant Q and the third invariant R for the different scales are extracted. Then other important invariants such as the rate of rotation tensor QW and the rate of deformation QS are also identified for each scale. The anisotropic diffusion model is used to extract the coherent and incoherent parts of each invariant at each scale. Then the JPDFs of the coherent and incoherent invariants are compared. The scale decomposition and the filtering process are applied for turbulent flow fields that are simulated using the lattice Boltzmann method with resolution of 128.
方法:采用傅里叶分解和各向异性扩散模型进行研究。通过对速度场在不同截止波数下的傅里叶分解进行提取,确定了三种不同的尺度(大、中、细尺度)。提取了不同尺度下的第二不变量Q和第三不变量R等速度梯度不变量。在此基础上,确定了每个尺度的旋转张量速率QW和变形速率QS等重要不变量。利用各向异性扩散模型提取各尺度下各不变量的相干和非相干部分。然后比较了相干不变量和非相干不变量的jpg格式。对分辨率为128的晶格玻尔兹曼法模拟的湍流流场进行了尺度分解和滤波处理。
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引用次数: 0
Growth of Spiral Vortices in a Globally Unstable Region on a Rotating Disk 旋转圆盘上全局不稳定区域螺旋涡的生长
Pub Date : 2018-02-15 DOI: 10.2174/1874155X01812010022
Lee Keunseob, N. Yu, Izawa Seiichiro, F. Yu
Results: Four cases with azimuthal domain sizes of 2π/10, 2π/70, 2π/80 and 2π/90 are compared. In all cases, a short-duration wall-normal random suction and blowing is introduced from the wall at the beginning of the computation. In the computation for the wider size 2π/10 domain, wavenumber components of 70, 80 and 90 are all found to co-exist in the flow field, with the wavenumber 80 component being much stronger than the other two components. The strength of the wavenumber 80 component is equivalent to the narrower domain case. For the other two wavenumber components of 70 and 90, the strengths in the wider domain case are much lower compared to the corresponding narrower domain cases. When the same wavenumber components are compared between the wider and narrower domain computations, no difference can be found, indicating that each wavenumber component grows by the global instability.
结果:比较了4例2π/10、2π/70、2π/80、2π/90的方位角域大小。在所有情况下,在计算开始时都引入了短时间的墙-法向随机吸力和吹气。在更宽尺寸2π/10域的计算中,发现70、80和90波数分量都在流场中共存,其中80波数分量比其他两个分量强得多。波数80分量的强度与窄域情况等效。对于70和90的其他两个波数分量,宽域情况下的强度比相应的窄域情况要低得多。将相同的波数分量在宽域和窄域计算中进行比较,没有发现差异,说明每个波数分量由于全局不稳定性而增长。
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引用次数: 0
Applied Mathematics and Mechanical Engineering Problems 应用数学与机械工程问题
Pub Date : 2018-02-15 DOI: 10.2174/1874155X01812010021
W. A. Kareem
There are many joint problems between applied mathematics and mechanical engineering. Such problems are very important for development of both experimental and theoretical studies. For example, Fluid flow problems such as boundary layer flow, bio-fluids and turbulent flow are important for various engineering applications. Such problems are studied by many ways such as analytical or numerical solutions of the Navier-Stokes equation. Dealing with the large data that obtained by the numerical simulations needs to be filtered and analyzed by different filtering techniques. Now, Filtering techniques that are used in image processing problems are considered as efficient techniques for several fluid flow problems. Many research efforts for extraction and filtering of the flow fields are carried out and the results show high ability to extract important characteristics of the flow fields. However, more efforts are required to achieve better understanding for the universal characteristics of the fluid flow problems. Also, analytical solutions to continuum mechanics and elasticity problems are very important as well as their numerical solutions. Investigation of those studies with their applications to real world life problem help in understanding and developing theoretical as well as empirical techniques. Specific topics of interest include (but are not limited to): 1. Turbulent and boundary layer flow problems. 2. Analytical and numerical solutions to the Navier-Stokes and Boltzmann equations. 3. Fourier decomposition and wavelet filtering. 4. Partial differential equations filtering methods. 5. Harmonic filtering methods. 6. New filtering methods. 7. Visualization techniques for signal processing and turbulent flow. 8. Reduce the time consuming for filtering and enhancement processes. 9. Connection between image processing and fluids flow problems via filtering techniques. 10. Numerical solutions to elasticity and continuum mechanics problems. 11. New analytical techniques to solve continuum mechanics and elasticity equations. This special issue is organized by:
应用数学与机械工程之间存在着许多共同的问题。这些问题对于实验和理论研究的发展都是非常重要的。例如,边界层流动、生物流体和湍流等流体流动问题在各种工程应用中都很重要。这类问题的研究方法有很多,如解析解或数值解的Navier-Stokes方程。对于数值模拟得到的大量数据,需要采用不同的滤波技术进行滤波和分析。现在,用于图像处理问题的滤波技术被认为是几种流体流动问题的有效技术。对流场的提取和滤波进行了大量的研究,结果表明该方法能够很好地提取流场的重要特征。然而,为了更好地理解流体流动问题的普遍特征,还需要做出更多的努力。此外,连续介质力学和弹性问题的解析解及其数值解也非常重要。对这些研究及其在现实生活问题中的应用进行调查,有助于理解和发展理论和实证技术。具体感兴趣的主题包括(但不限于):1。湍流和边界层流动问题。2. Navier-Stokes和Boltzmann方程的解析解和数值解。3.傅里叶分解和小波滤波。4. 偏微分方程滤波方法。5. 谐波滤波方法。6. 新的过滤方法。7. 信号处理和湍流的可视化技术。8. 减少过滤和增强过程所耗费的时间。9. 通过滤波技术将图像处理与流体流动问题联系起来。10. 弹性和连续介质力学问题的数值解。11. 求解连续介质力学和弹性方程的新解析技术。本期特刊由以下机构主办:
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引用次数: 0
Relation Between Convective Instability and Global Instability on a Rotating Disk 旋转圆盘上对流不稳定性与全局不稳定性的关系
Pub Date : 2018-02-15 DOI: 10.2174/1874155X01812010037
Lee Keunseob, N. Yu, Izawa Seiichiro, F. Yu
Results: A disturbance is continuatively introduced to excite the convectively unstable mode, which successfully generates a flow field with 32 spiral and stationary vortices. Next, a short-duration artificial disturbance with an azimuthal wavenumber of 64 is introduced at Reynolds number of 530 in order to introduce a velocity fluctuation of the traveling mode, which is globally unstable. It is shown that the source of vibration for the globally unstable mode exists between Reynolds number of 560 and 670. Finally, the global and traveling wavenumber 64 component is excited in a flow field which is dominated by the convective and stationary wavenumber 32 component. It is shown that the wavenumber 64 component grows by the global instability even when the excitation is very weak.
结果:连续引入扰动激发对流不稳定模态,成功地产生了32个螺旋涡和静止涡的流场。其次,在雷诺数为530时,引入方位角波数为64的短持续人为扰动,以引入全局不稳定的行模速度波动。结果表明,全局不稳定模态的振动源存在于雷诺数560 ~ 670之间。最后,在以对流和平稳波数32分量为主的流场中激发全局和行波数64分量。结果表明,即使在激励很弱的情况下,波数64分量也会随着全局不稳定性而增大。
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引用次数: 0
Simplified and Accurate Stiffness of a Prismatic Anisotropic Thin-Walled Box 棱镜各向异性薄壁箱刚度的简化和精确计算
Pub Date : 2018-02-14 DOI: 10.2174/1874155X01812010001
G. Canale, F. Rubino, P. Weaver, R. Citarella, A. Maligno
RESEARCH ARTICLE Simplified and Accurate Stiffness of a Prismatic Anisotropic ThinWalled Box Giacomo Canale, Felice Rubino, Paul M. Weaver, Roberto Citarella and Angelo Maligno Rolls-Royce plc, Moor Lane, Derby, UK Department of Industrial Engineering, University of Salerno, Giovanni Paolo II 132, 84084 Fisciano (SA), Italy Department of Aerospace Engineering, University of Bristol, Queens Building, University Walk, Bristol BS8 1TR, UK Institute for Innovation in Sustainable Engineering, University of Derby, Quaker Way, Derby DE1 3EE, UK
Giacomo Canale, Felice Rubino, Paul M. Weaver, Roberto Citarella and Angelo Maligno Rolls-Royce plc, Moor Lane, Derby,英国萨莱诺大学工业工程系,Giovanni Paolo II 132,84084 Fisciano (SA),意大利布里斯托尔大学航空航天工程系,Queens Building, University Walk, Bristol bs81tr,英国可持续工程创新研究所德比大学,贵格路,德比de13ee,英国
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引用次数: 3
Contribution of Bamboo for Vibratory Comfort in Biomechanics of Cycling 竹材对自行车生物力学振动舒适性的贡献
Pub Date : 2017-09-30 DOI: 10.2174/1874155X01711010044
X. Chiementin, S. Crequy, R. Feron, M. Múnera, E. Abdi, T. Provot, R. Taiar
RESEARCH ARTICLE Contribution of Bamboo for Vibratory Comfort in Biomechanics of Cycling Xavier Chiementin, Samuel Crequy, Robin Feron, Marcela Munera, Ellie Abdi, Thomas Provot and Redha Taiar GRESPI, Moulin de la Housse, Université de Reims Champagne Ardenne, Reims, France IN’BO, ZA Les Bouleaux, Les Voivres, France Escuela Colombiana de Ingeniería Julio Garavito, Bogotá D.C., Colombia Montclair State University, Upper Montclair, New Jersey, USA EPF, 3 bis rue Lakanal, Sceaux, France Arts et Métiers ParisTech, MSMP / EA7350, Châlons-en-Champagne, France
研究文章竹木对自行车生物力学振动舒适性的贡献Xavier Chiementin, Samuel Crequy, Robin Feron, Marcela Munera, Ellie Abdi, Thomas Provot和Redha Taiar GRESPI, Moulin de la Housse,兰斯香槟阿登兰斯大学,兰斯,法国in 'BO, ZA Les Bouleaux, Les Voivres,法国Escuela columbiana de Ingeniería Julio Garavito,波哥大,哥伦比亚蒙特克莱尔州立大学,上蒙特克莱尔,新泽西州,美国EPF, 3 bis rue Lakanal, Sceaux,巴黎高科,MSMP / EA7350, ch朗斯香槟区,法国
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引用次数: 1
Study on Temperature Measurement Point Optimization and Thermal Error Modeling of NC Machine Tools 数控机床温度测点优化及热误差建模研究
Pub Date : 2017-07-31 DOI: 10.2174/1874155X01711010037
Shuo Fan, Qianjian Guo
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引用次数: 3
期刊
The Open Mechanical Engineering Journal
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