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Vibration Attenuation Mechanism of the Rotor System with Anisotropic Support Stiffness 支承刚度各向异性转子系统的减振机理
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-03-05 DOI: 10.21278/TOF.451017220
Sheng-Cai Li, L. Zheng
Using the one-dimensional finite element method, the dynamic behaviour of a doubledisk rotor system with anisotropic supports is studied in this paper. First, the natural frequencies, whirl state and unbalance response of the rotor system are analysed. Then, the vibration attenuation mechanism of the rotor system under the effect of bearing damping and accelerating rotor is discussed in detail. The research results show that stiffness anisotropy makes natural frequency lines of the rotor system tend to diverge from each other. The damping in bearings not only decreases the amplitude of forward and backward whirls but also reduces the spin speed range of backward whirl. The whirl orbit of the rotor system approximates a straight line at the spin speeds near the critical point of the backward and forward whirls. For the unbalance response of the rotor system with anisotropic supports, the forward natural frequency dominates in the direction of the strong stiffness axis, while the unbalance response in the direction of the weak stiffness axis is mainly affected by the backward natural frequency. Increasing the run-up acceleration can decrease the amplitude of backward and forward whirls, but it cannot reduce the spin speed range of backward whirl.
本文采用一维有限元法研究了各向异性支承双盘转子系统的动力特性。首先,分析了转子系统的固有频率、旋转状态和不平衡响应。然后,详细讨论了轴承阻尼和转子加速作用下转子系统的减振机理。研究结果表明,刚度各向异性使转子系统固有频率线趋于发散。轴承中的阻尼不仅降低了前向和后向旋转的振幅,而且减小了后向旋转的转速范围。在前后旋速临界点附近,转子系统的旋转轨道近似于一条直线。对于各向异性支承转子系统的不平衡响应,强刚度轴方向的不平衡响应主要受正向固有频率的影响,而弱刚度轴方向的不平衡响应主要受反向固有频率的影响。增大助跑加速度可以减小后向和前向旋涡的振幅,但不能减小后向旋涡的转速范围。
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引用次数: 0
A Bayesian Conjugate Model for the Estimation of Friction Intensity 摩擦强度估计的贝叶斯共轭模型
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-03-05 DOI: 10.21278/TOF.451026321
S. Perišić, J. Barle, Predrag Đukić, H. Wolf
This paper addresses the Coulomb dry friction force as a technical indicator for fast and efficient condition-based maintenance. To estimate the value of friction force, the Bayesian analysis is used. Instead of the complex Markov Chain Monte Carlo numerical method, a closed-form analytical solution is applied. Thus, a simple and efficient procedure for friction estimation is described. Such a solution in the Bayesian context is known as the conjugate prior. The procedure presented here is verified numerically and experimentally by directly comparing the estimated value with the measured one. Two families of conjugate priors, the gamma-exponential and the normal-gamma, are compared. It is shown that the latter is suitable for friction estimation. An additional parameter, the precision parameter, was proposed as a criterion for the acceptance of estimation.
本文将库仑干摩擦力作为快速有效的状态维护的技术指标。为了估计摩擦力的值,使用了贝叶斯分析。应用闭式解析解代替了复杂的马尔可夫链蒙特卡罗数值方法。因此,描述了一种简单而有效的摩擦估计过程。贝叶斯上下文中的这种解决方案被称为共轭先验。通过直接将估计值与测量值进行比较,对本文提出的程序进行了数值和实验验证。比较了两类共轭先验,伽玛指数先验和正态伽玛先验。结果表明,后者适用于摩擦估计。提出了一个附加参数,即精度参数,作为接受估计的标准。
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引用次数: 0
A Model for Maintenance Planning and Process Quality Control Optimization Based on EWMA and CUSUM Control Charts 基于EWMA和CUSUM控制图的维修计划和过程质量控制优化模型
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-03-05 DOI: 10.21278/TOF.451021920
Mohammed A. Noman, Adel M. Al-Shayea, E. A. Nasr, Husam Kaid, A. Al-Ahmari, A. Kamrani, Haitham A. Mahmoud
The performance of a production system is highly dependent on the smooth operation of various equipment and processes. Thus, reducing failures of the equipment and processes in a cost-effective manner improves overall performance; this is often achieved by carrying out maintenance and quality control policies. In this study, an integrated optimization method that addresses both maintenance strategies and quality control practices is proposed using an exponentially weighted moving average (EWMA) chart, in which both corrective and preventive maintenance policies are considered. The integrated model has been proposed to find optimal decision variables of both the process quality decision parameters and the optimal interval of preventive maintenance (i.e., Ns, Hs, L, λ, and t ) to result in overall optimal expected hourly total system costs. A case study is then utilized to investigate the impact of cost criteria on the proposed integrated model and to compare the proposed model with a model using the cumulative sum (CUSUM) control chart. The improved model outputs indicate that there is a reduction of 34.6% in the total expected costs compared with those of the other model using the CUSUM chart. Finally, an analysis of sensitivity to present the effectiveness of the model parameters and the main variables in the overall costs of the system is provided.
生产系统的性能高度依赖于各种设备和工艺的顺利运行。因此,以经济有效的方式减少设备和工艺的故障可以提高整体性能;这通常通过执行维护和质量控制政策来实现。在本研究中,提出了一种综合优化方法,解决了维修策略和质量控制实践,使用指数加权移动平均(EWMA)图,其中包括纠正和预防性维修策略。提出了集成模型,以寻找过程质量决策参数的最优决策变量和预防性维护的最优间隔(即Ns, Hs, L, λ和t),从而获得整体最优的期望每小时系统总成本。然后利用案例研究来调查成本标准对所建议的集成模型的影响,并将所建议的模型与使用累积和(CUSUM)控制图的模型进行比较。改进后的模型输出表明,与使用CUSUM图表的其他模型相比,总预期成本减少了34.6%。最后,对模型参数和系统总成本中主要变量的有效性进行了敏感性分析。
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引用次数: 3
Results of Heat Transfer Coefficient Estimation during the Quenching of Cylindrical Samples in Aqueous Solutions 圆柱形试样在水溶液中淬火时的传热系数估算结果
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-02-23 DOI: 10.21278/TOF.SI1008421
Š. Behrem, B. Hrnjica
Summary The paper presented the results of the heat transfer coefficient estimation in the process of two-dimensional axially symmetric quenching of cylindrical steel samples in aqueous 40  C solutions. One aqueous solution had 5% and the other one 25% of Aquatensid BW. Such solutions allow the rate of cooling of steel quenching less than the one in clean water, and higher than the one in thermal oils. The experimental setup consisted of quenching three dimensionally different cylindrical probes into two different quenchants. The position of the thermocouples inside each probe, the aqueous solution streaming around the probe and the construction of the cooling bath conditioned the thermodynamic setting of the problem. The mathematical setting of the problem was based on thermodynamic assumption of two-dimensional axially symmetric, nonlinear and nonstationary heat conduction. The position of the thermocouples conditioned the inverse way of the problem solving and it led to an approximate estimation of an unknown heat transfer coefficient. During the task solving the compute model used the experimental results of the temperature measurements for the minimisations of the square deviation between the calculated and measured temperatures in one position and moment of time. The analysis of the obtained results during the quenching of cylindrical probes in aqueous solutions was compared to the results obtained when quenching in
本文给出了圆柱钢试样在40°C水溶液中二维轴对称淬火过程中传热系数的估算结果。一种水溶液中Aquatensid BW含量为5%,另一种为25%。这样的溶液使钢淬火的冷却速度比在清水中要慢,而比在热油中要快。实验装置包括用两种不同的淬火剂淬火三维不同的圆柱形探针。每个探头内部热电偶的位置、探头周围流动的水溶液以及冷却浴的构造决定了问题的热力学设定。该问题的数学设置基于二维轴对称、非线性和非平稳热传导的热力学假设。热电偶的位置决定了问题的逆向求解方式,并导致了未知传热系数的近似估计。在任务求解过程中,计算模型使用温度测量的实验结果来最小化一个位置和时刻的计算温度与测量温度之间的平方偏差。对圆柱探针在水溶液中淬火的结果进行了分析,并与在水溶液中淬火的结果进行了比较
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引用次数: 2
Wear Rate Evaluation of Sol-Gel TiO2-ZrO2 Films by Quantitative Depth Profile Analysis 溶胶-凝胶TiO2-ZrO2薄膜磨损率定量深度剖面分析
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-02-23 DOI: 10.21278/tof.444016120
K. Grilec, L. Ćurković, I. Žmak
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引用次数: 1
Numerical Investigation of Cover Plate Configurations Effect on Thermal Characteristics of a Polymer Solar Collector 盖板形态对聚合物太阳能集热器热特性影响的数值研究
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-02-23 DOI: 10.21278/TOF.SI1009821
P. Filipović, D. Dović, I. Horvat, B. Ranilović
COLLECTOR Summary This paper presents numerical analysis on influence of different configurations on thermal performances of a polymer solar collector. In the first step two configurations including single cover plate and honeycomb cover plate are investigated. Results showed that collector with single cover plate is more efficient than collector with honeycomb cover plate at lower reduced temperature values. Honeycomb cover plate behaves like insulator, increasing overall collector top resistance to heat loss which results in higher thermal efficiency at higher reduced temperature values. This also leads to higher temperatures at stagnation regimes. Also, in this paper two passive overheating protection based on natural convection are examined. Channels inside honeycomb cover plate can be connected to channels inside absorber plate allowing for air to flow inside collector. Three different channel widths are considered 4.25, 10, and 20 mm. With such passive method, it is possible to reduce average absorber temperature up to ~20°C. Second overheating protection uses additional channel below the absorber plate allowing the flow of ambient air. With this method it is possible to reduce temperatures up to ~50°C but it also causes high temperature gradient, 50°C/m of collector length which can potentially result in deformation of polymer solar collector. Present work is a part of the research focused at development of a low-cost polymer solar collector that operates in a drain back
本文对不同结构对聚合物太阳能集热器热性能的影响进行了数值分析。第一步研究了单盖板和蜂窝盖板两种结构形式。结果表明,在较低的还原温度值下,单盖板集热器比蜂窝盖板集热器效率更高。蜂窝盖板的行为类似于绝缘体,增加了整体集热器顶部对热损失的阻力,从而在更高的降低温度值下获得更高的热效率。这也导致在停滞状态下温度更高。本文还对两种基于自然对流的被动过热保护进行了研究。蜂窝盖板内的通道可以连接到吸收板内的通道,使空气在集热器内流动。三种不同的通道宽度被认为是4.25、10和20毫米。采用这种被动方法,可以将吸收器的平均温度降低到~20°C。第二过热保护使用额外的通道下面的吸收板允许流动的环境空气。使用这种方法可以将温度降低到~50°C,但它也会导致高温度梯度,集热器长度为50°C/m,这可能导致聚合物太阳能集热器变形。目前的工作是研究的一部分,重点是开发一种低成本的聚合物太阳能收集器,这种收集器可以在排水道中运行
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引用次数: 0
Infrared Thermography as a Prediction Tool for the Irrigation Requirement in Agriculture 红外热像仪在农业灌溉需求预测中的应用
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-02-23 DOI: 10.21278/TOF.SI1006621
B. Ranilović, Alen Cukrov, I. Boras, S. Švaić, M. Zovko
Summary This paper deals with the possibility of using infrared thermography to determine the irrigation requirement for a given field depending on the water stress level of the plants. The experiments were performed on vines at the site in the village of Jadrtovac near Šibenik, Croatia. The water stress level of plants was determined through leaf temperature measurements and measurements of leaf water potential (LWP). Leaf temperature measurements were performed using infrared thermography. Based on these measurements the relationship between the LWP and a derived factor, Crop Water Stress Index (CWSI) was investigated. The results obtained show that infrared thermography could be successfully used to measure the leaf temperature, which is the input parameter for calculating the
摘要本文探讨了使用红外热像仪根据植物的水分胁迫水平来确定给定田地的灌溉需求的可能性。实验是在克罗地亚Šibenik附近Jadrtovac村的葡萄藤上进行的。通过叶片温度测量和叶片水势(LWP)测量来确定植物的水分胁迫水平。使用红外热像仪进行叶片温度测量。基于这些测量结果,研究了LWP与衍生因子作物水分胁迫指数(CWSI)之间的关系。结果表明,红外热像仪可以成功地用于测量叶片温度,这是计算叶片温度的输入参数
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引用次数: 0
The Model Prediction of Life Cycle Ownership Costs of Special Motor Vehicles 特种机动车辆全寿命拥有成本的模型预测
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-01-22 DOI: 10.21278/tof.444004719
J. Furch
The paper deals with the prediction of life cycle costs related to special motor vehicles. In the first part, there is an analysis of the applied commercial software programs used for calculating and predicting the life cycle cost of vehicles. Next, there is a description of risks which might occur when calculating the life cycle cost and of the possible risk management. In the second part of the paper it is suggested that the motor vehicle life cycle cost can be predicted based on accurate data which are generally difficult to obtain, e.g. failure intensity z(t) or mean time between failures (MTBFs) used for calculating the cost after maintenance. The final part includes a proposal for the prediction of the ownership life cycle cost which consists of the operating and maintenance costs of special motor vehicles. This proposal is based on the company logistic information system, which at regular intervals assesses special vehicle life cycle cost during operation and maintenance. Under special motor vehicles here we understand the vehicles which are equipped with a chassis and a special vehicle superstructure which consumes operation units and on which maintenance is performed. Such vehicles are used in the construction or agricultural industry as well as in the military environment. The paper focuses on the design of a prediction model of the ownership life cycle cost of the military environment, where a relevant military logistic information system is used.
本文研究了特种机动车辆全寿命周期成本的预测问题。在第一部分中,分析了用于计算和预测车辆寿命周期成本的应用商业软件程序。接下来,描述了在计算生命周期成本和可能的风险管理时可能出现的风险。本文第二部分提出了基于故障强度z(t)或平均故障间隔时间(MTBFs)等难以获得的准确数据来预测机动车全寿命周期成本的方法。最后,提出了专用机动车辆全寿命周期成本的预测方案,全寿命周期成本包括专用机动车辆的运行和维护成本。该方案基于公司物流信息系统,该系统定期评估特种车辆在运行和维修期间的生命周期成本。这里所说的特种机动车辆,我们指的是配备了底盘和专用车辆上层结构、消耗操作单元并对其进行维护的车辆。这种车辆在建筑或农业工业以及军事环境中使用。本文以某军用后勤信息系统为背景,重点设计了军用环境下所有权生命周期成本的预测模型。
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引用次数: 1
Milling Machine Error Modelling and Analysis in the Machining of Circular-Arc-Tooth-Trace Cylindrical Gears 圆弧齿迹圆柱齿轮加工中的铣床误差建模与分析
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-01-22 DOI: 10.21278/tof.444009419
Yang Wu, Li Hou, Dengqiu Ma, W. Yongqiao, Lan Luo
GEARS Summary This paper is to study errors of a milling machine used for the machining of Circular-Arc-Tooth-Trace (CATT) cylindrical gears. A topological structure model of the milling machine is established using the lower numbered body array approach. Coordinate transformation matrices between adjacent parts of the milling machine are set up by the D-H homogeneous transformation matrix. Based on the topological structure model and transformation matrices, a comprehensive error model of a milling machine used for the machining of CATT gears is established. According to the error model, the angle errors of the milling point are linear combinations of the angle errors of moving parts, while the displacement errors of the milling point are related to displacement errors, the angle errors of moving parts, the adjustment parameters of machine tools, and the geometric parameters of the gear. Finally, the influence of the errors of the cutter head on the milling point errors in the machining of CATT gears are discussed. The research can provide a theoretical basis for the error analysis, precision design, and the geometric error compensation of a milling machine used for CATT gear
本文研究了圆弧齿迹(CATT)圆柱齿轮铣床的误差。采用低编号体阵列法建立了铣床的拓扑结构模型。利用D-H齐次变换矩阵建立铣床相邻零件间的坐标变换矩阵。基于拓扑结构模型和变换矩阵,建立了CATT齿轮铣床的综合误差模型。根据误差模型,铣削点的角度误差是运动部件角度误差的线性组合,而铣削点的位移误差与位移误差、运动部件角度误差、机床调节参数和齿轮几何参数有关。最后,讨论了CATT齿轮加工中刀盘误差对铣削点误差的影响。研究结果可为CATT齿轮铣床的误差分析、精度设计和几何误差补偿提供理论依据
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引用次数: 5
Contact Stress Prediction Model for Variable Hyperbolic Circular Arc Gear Based on the Optimized Kriging-Response Surface Model 基于优化Kriging响应面模型的变双曲圆弧齿轮接触应力预测模型
IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2021-01-22 DOI: 10.21278/tof.444011819
Zhang Qi, Wen Guang, Luo Lan, T. Rui
In order to study the influence of design parameters (pressure angle, tooth width, tooth line radius, modulus, and moment) on contact stress of variable hyperbolic circular arc gear (VHCAG) and to obtain the best manufacturing parameters, The Kriging-Response Surface Model, a hybrid surrogate model with adaptive quantum particle swarm optimization (QPSO) algorithm was proposed to establish the expression prediction model for the relation between design parameters and contact stress. An intelligent quantum particle swarm optimization algorithm based on adaptive weight and natural selection is proposed to optimize the parameters of Gaussian variation function of the kriging surrogate model to improve its fitting accuracy. The global search ability of quantum particles is improved, and the accuracy and stability of the algorithm are improved by adjusting the weight of quantum particles adaptively and by optimizing the elimination iteration process, and the response relationship between design parameters and contact stress was established. The binomial response surface model of gear design parameters and contact stress is established based on the output obtained through the improved kriging model; this simplifies the complex expression of the kriging model. The effects of parameters and their cross-terms on contact stress are analysed based on the contact stress prediction model established by using the optimized Kriging-Response Surface Model hybrid surrogate model. The hybrid Kriging-Response Surface Model surrogate model lays a foundation for the research on the reliability and robust optimization of cylindrical gears with variable hyperbolic arc tooth profile.
为了研究设计参数(压力角、齿宽、齿线半径、模量和力矩)对变双曲圆弧齿轮(VHCAG)接触应力的影响,获得最佳的制造参数,为了建立设计参数与接触应力关系的表达式预测模型,提出了一种与自适应量子粒子群优化(QPSO)算法相结合的混合代理模型。提出了一种基于自适应权值和自然选择的智能量子粒子群优化算法,对克里格代理模型的高斯变异函数参数进行优化,以提高其拟合精度。通过自适应调整量子粒子的权重和优化消除迭代过程,提高了量子粒子的全局搜索能力,提高了算法的准确性和稳定性,建立了设计参数与接触应力的响应关系。基于改进的克里格模型得到的输出,建立了齿轮设计参数和接触应力的二项式响应面模型;这简化了克里格模型的复杂表达式。基于优化Kriging响应面模型混合代理模型建立的接触应力预测模型,分析了参数及其交叉项对接触应力的影响。混合Kriging响应面模型代理模型为变双曲弧齿圆柱齿轮的可靠性和鲁棒优化研究奠定了基础。
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引用次数: 2
期刊
Transactions of FAMENA
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