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2021 7th International Conference on Mechanical Engineering and Automation Science (ICMEAS)最新文献

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Flight Dynamics Simulators of Modular Structure: Assessment of the Dynamic Characteristics of an Object 模块化结构的飞行动力学模拟器:物体动态特性的评估
Budylina Eugenia, Danilov Alexander, Garkina Irina
Improving the modeling of the dynamics of an object of an ergatic system requires the development of rational mathematical models based on flexible modular software, design automation, testing, as well as improving methods for identifying and correcting models. With a sharp increase in the quality of computer systems, the relevance of the development of analytical methods for the study of complex dynamic systems, including for the decomposition and creation of a modular hierarchical structure, has only increased. Proceeding from this, in the work in the application to the development of aviation simulators, the criteria for evaluating the dynamic characteristics of the object by the operator during the normal functioning of the ergatic system are determined. The main attention is paid to the short-period component of the longitudinal motion. The expansion of the spatial motion into longitudinal and transverse is carried out in terms of the roots of the characteristic polynomial of the fourth order (an example is given). A graphical-analytical method for determining the roots of a characteristic polynomial has been developed; the calculation algorithm is presented (it was effectively used in the development of a number of simulators). When studying spatial motion, it is natural to divide into separate channels. The simulation characteristics of the simulators are determined based on the corresponding simulation characteristics for each of the channels. Root methods play a special role in such studies. We restrict ourselves to systems described on each of the channels by systems of ordinary differential equations. The formalization of the criteria for evaluating the dynamic characteristics of the object by the operator in the process of functioning of the ergatic system is carried out.
改进系统对象的动力学建模需要在灵活的模块化软件、设计自动化、测试的基础上开发合理的数学模型,以及改进识别和修正模型的方法。随着计算机系统质量的急剧提高,开发用于研究复杂动态系统的分析方法的相关性,包括用于分解和创建模块化层次结构的分析方法,只会增加。由此出发,在应用于航空模拟器开发的工作中,确定了操作人员在飞行系统正常工作过程中评估目标动态特性的标准。主要关注的是纵向运动的短周期分量。利用四阶特征多项式的根将空间运动展开为纵向运动和横向运动(给出了一个例子)。提出了一种确定特征多项式根的图解解析方法;给出了计算算法,并在多个模拟器的开发中得到了有效的应用。在研究空间运动时,自然会将其划分为单独的通道。根据每个通道的相应仿真特性确定模拟器的仿真特性。根法在这类研究中起着特殊的作用。我们把自己限制在用常微分方程系统在每个通道上描述的系统。在系统运行过程中,实现了操作者评价目标动态特性的标准的形式化。
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引用次数: 0
Robust Strong Tracking Cubature Kalman Filter for Attitude Estimation of Failed Spacecraft 失效航天器姿态估计的鲁棒强跟踪Cubature Kalman滤波
H. Ma, Zhen Lu, X. Zhang, W. Liao
The malfunction of attitude control system will lead to continuous attitude tumble of on-orbit spacecraft, which brings two problems to attitude estimation, one is the large initial error, and the other is the status mutation. Focusing on the above two issues, a robust strong tracking cubature Kalman filter (RSTCKF) is proposed in this paper to obtain the high-precision and real-time attitude knowledge of failed spacecraft. On the one hand, the multiplicative quaternion is adopted in the whole filter process instead of the additive one to keep the quaternion normalized, which increases the numerical stability of CKF; on the other hand, the time-varying multiple fading factors are introduced to adjust the different channels of prediction error covariance matrix, which strengthens the tracking ability of CKF to status mutation. Numerical simulations verify the effectiveness of the developed algorithm.
姿态控制系统的故障将导致在轨航天器的姿态持续翻滚,这给姿态估计带来两个问题,一是初始误差大,二是状态突变。针对上述两个问题,本文提出了一种鲁棒强跟踪cubature Kalman滤波器(RSTCKF),用于获取故障航天器的高精度实时姿态信息。一方面,在整个滤波过程中采用乘法四元数代替加性四元数,保持了四元数的归一化,增加了CKF的数值稳定性;另一方面,引入时变多重衰落因子对不同信道的预测误差协方差矩阵进行调整,增强了CKF对状态突变的跟踪能力。数值仿真验证了该算法的有效性。
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引用次数: 0
A Local Gravity Kinematics Synchronization Clustering Algorithm 局部重力运动同步聚类算法
Liang Yan, Zhao Dongguo, Lu Xianguo, Jie Xiaoyuan, Wang Chenglin
We propose a new clustering method called LGKSC, which is an alternative model based on gravitational kinematics to simulate local synchronization. The difference from existing clustering algorithms is that the algorithm makes objects over time. The dynamics of interaction are gradually synchronized dynamically, forming a local cluster corresponding to the internal structure of the data set. LGKSC can determine clusters with any shape, size and density, and can identify the amount of clusters automatically. LGKSC can adaptively identify the neighbors of the data objects based on the Davies-Bouldin (DB) index, so it can choose the best clustering results. Experiments indicate that the proposed method may take more time to run, but the algorithm have advantages in detecting the amount and the accuracy of clusters.
我们提出了一种新的聚类方法,称为LGKSC,这是一种基于重力运动学模拟局部同步的替代模型。与现有聚类算法的不同之处在于,该算法随着时间的推移生成对象。交互的动态逐渐动态同步,形成与数据集内部结构相对应的局部聚类。LGKSC可以确定任何形状、大小和密度的聚类,并可以自动识别聚类的数量。LGKSC可以基于DB (Davies-Bouldin)索引自适应识别数据对象的邻居,从而选择最佳聚类结果。实验表明,该方法运行时间较长,但在聚类数量和准确率检测方面具有优势。
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引用次数: 0
Investigation of Afterburning Effects on the Thermal Environment of Flame Deflectors 转焰器加力燃烧对热环境影响的研究
Lu Chenyu, Liang Xiaoyang, Zhou Zhitan, Le Guigao
In this paper, a four-nozzle liquid oxygen (LOX)/kerosene rocket is used to analyse the afterburning effects on the thermal environment of flame deflectors. Based on the three-dimensional compressible Reynolds-Averaged Navier-Stokes (RANS) equations and the realizable k-ε turbulence model, the rocket plume model is established. A 9-species,10-steps chemistry scheme is used for the simulation of afterburning reaction. On this basis, the impinging flow fields of the rocket exhaustjet with and without chemical reaction are calculated. The results show that the afterburning reaction mainly occurs in the tail section of the plume and the near-wall region, which will obviously increase the local gas temperature. Additionally, the temperature of the mixed layer of the plume also increases due to the afterburning reaction. For the deflector, the temperature of areas under the direct impingement of the rocket plume rises by 20% after adding the afterburning reaction. Meanwhile, a high-temperature layer will be formed, which will obviously increase the overall temperature of the deflector.
本文以四喷嘴液氧/煤油火箭为研究对象,分析了加力燃烧对转焰器热环境的影响。基于三维可压缩reynolds - average Navier-Stokes (RANS)方程和可实现的k-ε湍流模型,建立了火箭羽流模型。采用9种物质、10步化学方法模拟加力燃烧反应。在此基础上,计算了有化学反应和无化学反应时火箭排气射流的冲击流场。结果表明:加力燃烧反应主要发生在羽流尾部和近壁面区域,会明显提高局部气体温度;此外,羽流混合层的温度也因加力燃烧反应而升高。对于偏转板,加入加力反应后,火箭羽流直接撞击区域的温度升高了20%。同时,会形成高温层,使偏转板整体温度明显升高。
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引用次数: 1
Regeneration of vehicle catalytic converters by metal treatment system in monoliths 整车催化转化器金属处理系统的再生
Leonidas Quiroz, Jimmy W. Gallegos, Christian Montaleza, Oscar Arteaga, R. Cruz
This article focuses on the study of the regeneration of catalyst monolith metals used in gasoline vehicles, through the realization of the oxidation-reduction method at: controlled temperature, exposure time and constant flow of inert gases (N2 and H2). According to the size and shape of the monolith structure of the commercial 2-way and 3-way catalysts used for the test, rectangular samples with a weight of 4.125 g and a cubic cut with 20 mm edges were taken for the study. In addition, the emissions behavior of each of the gases after regeneration was analyzed by means of a gas analyzer incorporated directly to the reactor with the samples treated in a vehicle without catalytic converter, thus determining that through the oxidation-reduction process the species of the catalytic monolith are recovered. In this way, the catalytic process of transforming harmful emissions into harmless gases, product of the combustion processes of gasoline engines, is improved, thus reducing the environmental waste they produce after elimination. It should be noted that in simple processes, due to its ceramic structure and the presence of noble metals, its elimination is difficult.
本文重点研究了汽油车用催化剂金属单体的再生,通过在可控温度、暴露时间和恒流惰性气体(N2和H2)条件下实现氧化还原法。根据试验中使用的商业二路和三路催化剂的整体结构的大小和形状,选取重量为4.125 g的矩形样品和边缘为20 mm的立方切割进行研究。此外,通过直接安装在反应器上的气体分析仪分析了再生后每种气体的排放行为,并在没有催化转化器的车辆中处理了样品,从而确定通过氧化还原过程回收了催化单体的物种。通过这种方式,改进了将有害排放物转化为无害气体(汽油机燃烧过程的产物)的催化过程,从而减少了汽油机消除后产生的环境废物。需要注意的是,在简单的工艺中,由于其陶瓷结构和贵金属的存在,其消除是困难的。
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引用次数: 0
Mathematical Model on the Visualization of coaxiality Error 同轴度误差可视化的数学模型
Lijie Chen
The fundamental theory of generating coaxiality error graph is studied. A mathematical model for visualization of coaxiality error is established in accordance with the definition of coaxiality error in national standard. The theory of three-dimensional wireframe models on computer graphics is applied to realize the display of extracted derived feature and associated derived feature on the measured multi-diameter axle. Axonometric projection transformation is used to attain the realization of basic geometric shapes. The spacial hidden method is adopted to solve the problem of geometrical graph hidden. According to the above theoretical research, the corresponding software is developed on the LabWindows/CVI software platform to realize the visualization of coaxiality error.
研究了同轴度误差图生成的基本理论。根据国家标准对同轴度误差的定义,建立了同轴度误差可视化的数学模型。应用计算机图形学中的三维线框模型理论,实现了提取的衍生特征和关联衍生特征在被测多径轴上的显示。利用轴测投影变换实现基本几何形状。采用空间隐藏方法解决几何图形的隐藏问题。根据上述理论研究,在LabWindows/CVI软件平台上开发了相应的软件,实现了同轴度误差的可视化。
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引用次数: 0
Prediction of Weld Pool Profile of Dissimilar Laser Weld Between NiTi/Ti6Al4V Via Different Interlayers 不同夹层NiTi/Ti6Al4V异种激光焊接熔池轮廓的预测
F. B. Teshome, Bei Peng, W. Ke, Fuguo Ge, X. Du, Z. Zeng
NiTi and Ti6A14V were materials with superior properties and shared application areas while joining them with fusion weld stayed as a challenge. Solidification of excessive brittle Ti2Ni intermetallic phases and development of microcracks are the main challenges of creating weld between these alloys. Therefore, Pulsed mode welding with an offset laser was employed to develop a dissimilar weld between NiTi and Ti6A14V with the aid of Cobalt and Zirconium interlayers. The involvement of interlayers along with laser offsetting improved the mechanical properties of the joint. Tensile strength of the joints with Zirconium and Cobalt interlayers reached a maximum of 319MPa and 275MPa with a percentage elongation of 1.53% and 1.47%, while the weld without interlayer was limited to 148MPa and 0.8%. A thermal transient model with a Modified Three-Dimensional Conical volumetric heat source was employed to predict the temperature distribution and Weld-pool shape in dissimilar NiTi/Ti6Al4V weld with and without the interlayers, and a good agreement was evident between simulated and experimental results.
NiTi和Ti6A14V是具有优异性能和共同应用领域的材料,但用熔焊连接它们仍然是一个挑战。过度脆性Ti2Ni金属间相的凝固和微裂纹的发展是这些合金之间建立焊缝的主要挑战。因此,采用偏置激光脉冲模式焊接,在钴和锆夹层的帮助下,建立了NiTi与Ti6A14V之间的异质焊缝。中间层的加入和激光偏移改善了接头的力学性能。有锆、钴夹层的焊缝抗拉强度最高可达319MPa和275MPa,伸长率分别为1.53%和1.47%;无锆、钴夹层的焊缝抗拉强度最高可达148MPa和0.8%。采用改进的三维锥形体积热源热瞬态模型,对有无夹层的不同类型NiTi/Ti6Al4V焊缝的温度分布和焊池形状进行了预测,模拟结果与实验结果吻合较好。
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引用次数: 0
Multi-factor based analysis and statistical process control for body-in-white dimension status 白车身尺寸状态的多因素分析与统计过程控制
Yanjing Liu, Ruiting Li
With the tremendous improvement of industrial manufacturing, the methods and technology of automobile industry have made great progress. As a significant factor determining the appearance of vehicle models, the dimension control of body-in-white (BIW) also has constantly optimization in the continuous innovation of automotive products. The dimension control of BIW is of great importance in the production process and plays a connecting role in automobile manufacturing. As for actual BIW production, not only a complete body framework is established through the assembly of stamping parts, but also the hang-on parts are preliminarily installed and matched with the body framework to form the basis for the assembly of following parts. In this study, current researches and methods of BIW dimension control in automobile industry are summarized and illustrated. Then, factors which affecting the dimension status of BIW are classified and highlighted by main types. The model and system of process control based on data analysis are established. Finally, the model and strategy are sufficiently validated by test result.
随着工业制造水平的不断提高,汽车工业的制造方法和技术也有了很大的进步。作为决定车型外观的重要因素,白车身的尺寸控制在汽车产品的不断创新中也得到了不断的优化。白车身的尺寸控制在生产过程中具有十分重要的意义,在汽车制造中起着连接作用。在实际的白车身生产中,不仅通过冲压件的装配建立了一个完整的车身框架,而且还将悬挂件与车身框架进行了初步的安装和匹配,为后续零件的装配奠定了基础。本文对汽车工业中白车身尺寸控制的研究现状和方法进行了总结和说明。然后,对影响白车身尺寸状态的因素进行分类,并按主要类型突出显示。建立了基于数据分析的过程控制模型和系统。最后,通过试验结果对模型和策略进行了充分验证。
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引用次数: 0
Analysis of Atmospheric Drag Acceleration and Engineering Realization of Space Target 空间目标大气阻力加速度分析与工程实现
Xiaobin Huang, Yan Zhang, Rui Xiao
Space target orbit determination module is an important component of space target surveillance radar system. The development of this module requires very complex aerospace dynamics knowledge, which brings great difficulties to non-orbit mechanics researchers engaged in radar system design. The core of orbit determination is the calculation of perturbation acceleration, which is the basis of high precision numerical orbit calculation. To this end, this paper takes the atmospheric drag perturbation which can not be ignored in the precise orbit determination of LEO satellite as an example, introduces its mathematical principle, gives the program design idea and function interface implementation, and makes a simulation comparison with STK. The experimental results verify the effectiveness of the interface function, and show that the function interface designed in this paper can assist researchers in radar system design.
空间目标定轨模块是空间目标监视雷达系统的重要组成部分。该模块的开发需要非常复杂的航天动力学知识,这给从事雷达系统设计的非轨道力学研究人员带来了很大的困难。轨道确定的核心是摄动加速度的计算,它是高精度数值轨道计算的基础。为此,本文以LEO卫星精确定轨中不可忽视的大气阻力摄动为例,介绍了其数学原理,给出了程序设计思路和功能接口实现,并与STK进行了仿真比较,实验结果验证了接口函数的有效性,表明本文设计的功能接口可以辅助研究人员进行雷达系统设计。
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引用次数: 1
Message from Program Chair 项目主席致辞
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引用次数: 0
期刊
2021 7th International Conference on Mechanical Engineering and Automation Science (ICMEAS)
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