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Case study on the effectiveness of condition monitoring techniques for fault diagnosis of pumps in thermal power plant 状态监测技术在火电厂水泵故障诊断中的有效性案例研究
Q3 Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0010
Caneon Kurien, A. Srivastava
Abstract A case study was carried out to investigate the effectiveness of condition monitoring techniques in the early failure detection of pumps in a thermal power plant. Various condition monitoring techniques used in this case study involved vibration analysis, motor current signature analysis, noise monitoring and wear debris analysis. These techniques were applied on the three pumps, namely boiler feed water pump, auxiliary cooling water pump and condensate extraction pump, which have to work continuously for the operation of the thermal power plant. Vibration analysis of the auxiliary cooling water pump showed that there is a rising trend in the acceleration values at its driving and non-driving end indicating the deterioration of bearings. Motor current index range of all the pumps was found to be within acceptable limits. Wear debris analysis of lubricant in the hydraulic coupling of boiler feed water pump indicated the presence of sand, dirt and low alloy steel sliding wear particles in it. Condition monitoring techniques have been proved to be an effective technique in early failure detection of pumps.
摘要通过一个案例研究,探讨了状态监测技术在火电厂水泵早期故障检测中的有效性。本案例研究中使用的各种状态监测技术包括振动分析、电机电流特征分析、噪声监测和磨损碎片分析。这些技术被应用于三台泵上,即锅炉给水泵、辅助冷却水泵和冷凝水抽取泵,它们必须连续工作才能满足火力发电厂的运行。对辅助冷却水泵的振动分析表明,其驱动端和非驱动端的加速度值有上升趋势,表明轴承的老化。发现所有泵的电机电流指数范围都在可接受的范围内。通过对锅炉给水泵液力耦合器润滑油磨损碎屑的分析,发现其内部存在砂、污垢和低合金钢滑动磨损颗粒,状态监测技术已被证明是早期检测水泵故障的有效技术。
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引用次数: 2
Electrohydrodynamic Instability of a Rotating Walters’ (model B’) Fluid in a Porous Medium: Brinkman model 多孔介质中旋转Walters(模型B')流体的电流体动力学不稳定性:Brinkman模型
Q3 Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0019
G. C. Rana, R. Chand, Veena Sharma
Abstract In this study, the instability of Walters’ (model B’) viscoelastic fluid in a Darcy-Brinkman-Boussinesq system heated from below saturating a porous medium in electrohydrodynamics is considered. By applying the linear stability analysis and normal modes, the dispersion relation accounting for the effect of Prandtl number, electric Rayleigh number, Darcy number, Brinkman-Darcy number, Taylor number and kinematic viscoelasticity parameter is derived. The effects of electric Rayleigh number, Darcy number, Brinkman-Darcy number and Taylor number on the onset of stationary convection have been investigated both analytically and graphically.
本文研究了电流体力学中从饱和以下多孔介质加热的Darcy-Brinkman-Boussinesq系统中Walters '(模型B ')粘弹性流体的不稳定性。通过线性稳定性分析和正态模态,推导了考虑普朗特数、电瑞利数、达西数、布林克曼-达西数、泰勒数和运动粘弹性参数影响的色散关系。本文用解析法和图解法研究了电瑞利数、达西数、布林克曼-达西数和泰勒数对静止对流发生的影响。
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引用次数: 3
Investigation of mechanical behavior of friction stir welded joints of AA6063 with AA5083 aluminum alloys AA6063与AA5083铝合金搅拌摩擦焊接接头力学行为研究
Q3 Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0008
S. Dharani Kumar, S. Sendhil Kumar
Abstract Aluminum alloy finds its applications in various sectors of engineering. This paper discusses the investigation of mechanical characteristics of butt weld joints of aluminum alloy AA6063 along with AA5083. An experiment was conducted for different tool rotational speeds of 600 rpm, 800 rpm and 1000 rpm. Specifications of friction stir welding machine were 4 kN axial load and welding speed of 40 mm/min. Friction stir welded (FSW) joints of higher tensile strength, lower flexural strength and lower impact strength with maximum hardness, for the work piece fabricated at 1000 rpm using a high speed steel tool with a cylindrical profile was observed. Better understanding of the effect of tool rotational speed and mechanical properties was illustrated through the experimental result.
摘要铝合金在工程的各个领域都有着广泛的应用。本文对AA6063和AA5083铝合金对接焊缝的力学性能进行了研究。对600rpm、800rpm和1000rpm的不同工具转速进行了实验。搅拌摩擦焊机的规格为4kN轴向载荷,焊接速度为40mm/min。对于使用具有圆柱形轮廓的高速钢工具在1000rpm下制造的工件,观察到具有较高拉伸强度、较低弯曲强度和较低冲击强度且具有最大硬度的搅拌摩擦焊接(FSW)接头。实验结果表明,对刀具转速和机械性能的影响有了更好的理解。
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引用次数: 11
A Comparative Analysis of Artificial Intelligence-Based Methods for Fault Diagnosis of Mechanical Systems 基于人工智能的机械系统故障诊断方法比较分析
Q3 Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0016
R. Moghaddam, Navid Moshtaghi Yazdan
Abstract The present research studied fault diagnosis of composite sheets using vibration signal processing and artificial intelligence (AI)-based methods. To this end, vibration signals were collected from sound and faulty composite plates. Using different time-frequency signal analysis and processing methods, a number of features were extracted from these signals and the most effective features containing further information on these composite plates were provided as input to different classification systems. The output of these classification systems reveals the faults in composite plates. The different types of classification systems used in this research were the support vector machine (SVM), adaptive neuro-fuzzy inference system (ANFIS), k-nearest neighbor (k-NN), artificial neural networks (ANNs), Extended Classifier System (XCS) algorithm, and the proposed improved XCS algorithm. The research results were reflective of the superiority of ANFIS in terms of precision, while this method had the highest process duration with an equal number of iterations. The precision of the proposed improved XCS method was lower than that of ANFIS, but the duration of the process was shorter than the ANFIS method with an equal number of iterations.
摘要:本文研究了基于振动信号处理和人工智能的复合材料薄板故障诊断方法。为此,采集了正常和故障复合板的振动信号。使用不同的时频信号分析和处理方法,从这些信号中提取出许多特征,并将这些复合板上包含进一步信息的最有效特征作为输入提供给不同的分类系统。这些分类系统的输出结果揭示了复合板的断层。本研究中使用的分类系统包括支持向量机(SVM)、自适应神经模糊推理系统(ANFIS)、k-近邻(k-NN)、人工神经网络(ann)、扩展分类器系统(XCS)算法以及提出的改进XCS算法。研究结果反映了ANFIS在精度上的优势,而该方法在迭代次数相同的情况下,过程耗时最长。改进的XCS方法的精度低于ANFIS方法,但在迭代次数相同的情况下,过程持续时间比ANFIS方法短。
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引用次数: 0
An Analysis and Modeling of the Dynamic Stability of the Cutting Process Against Self-Excited Vibration 切削过程抗自激振动的动态稳定性分析与建模
Q3 Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0099
A. Motallebia, A. Doniavi, Y. Sahebi
Abstract Chatter is a self-excited vibration which depends on several parameters such as the dynamic characteristics of the machine tool structure, the material of the work piece, the material removal rate, and the geometry of tools. Chatter has an undesirable effect on dimensional accuracy, smoothness of the work piece surface, and the lifetime of tools and the machine tool. Thus, it is useful to understand this phenomenon in order to improve the economic aspect of machining. In the present article, first the theoretical study and mathematical modeling of chatter in the cutting process were carried out, and then by performing modal testing on a milling machine and drawing chatter stability diagrams, we determined the stability regions of the machine tool operation and recognized that witch parameter has a most important effect on chatter.
颤振是一种自激振动,它取决于机床结构的动态特性、工件的材料、材料的去除率和刀具的几何形状等参数。颤振对尺寸精度、工件表面光洁度以及刀具和机床的使用寿命都有不良影响。因此,为了提高加工的经济性,了解这种现象是有用的。本文首先对切削过程中的颤振进行了理论研究和数学建模,然后在铣床上进行了模态试验,绘制了颤振稳定性图,确定了机床运行的稳定区域,并认识到机床参数对颤振的影响最为重要。
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引用次数: 2
Experimental Method of Tribological Modelling of Different Coatings of Stainless Steel 不锈钢不同涂层摩擦学建模的实验方法
Q3 Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0098
Kaid-Ameur Djilali, M. Serrier
Abstract Fretting wear is a unique form of material degradation caused by small amplitude oscillatory relative motion of two surfaces in contact. Fretting wear is typically encountered at relative displacements of less than 300 μm and occurs in either a gross slip regime [1] (where there is slip displacement across the whole contact), or a partial slip regime (where there are parts of the contact where no slip displacement occurs). Fretting wear is experienced within a wide range of industrial sectors, [2] including aero engine couplings, locomotive axles and nuclear fuel casings [3]. Under higher loads and smaller displacement amplitudes, the contact will be within the partial slip regime, often resulting in fretting fatigue where the dominant damage mode is a reduction in fatigue life [4]. Friction is a very common phenomenon in daily life and industry, which is governed by the processes occurring in the thin surfaces layers of bodies in moving contact. The simple and fruitful idea used in studies of friction is that there are two main non-interacting components of friction, namely, adhesion and deformation [5, 6].
微动磨损是由两个接触表面的小幅度振荡相对运动引起的材料退化的一种独特形式。微动磨损通常发生在相对位移小于300 μm时,并且发生在总滑移状态[1](整个接触点存在滑移位移)或部分滑移状态(接触点的某些部分不发生滑移位移)。微动磨损在工业领域广泛存在,包括航空发动机联轴器、机车车轴和核燃料套管。在较高的载荷和较小的位移幅值下,接触将处于局部滑移状态,通常导致微动疲劳,其中主要的损伤模式是疲劳寿命的降低。摩擦在日常生活和工业中是一种非常普遍的现象,它是由运动接触的物体的薄表面层所发生的过程所控制的。在摩擦研究中使用的简单而富有成效的想法是,摩擦力有两个主要的非相互作用成分,即附着和变形[5,6]。
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引用次数: 1
Parametric Optimization of Dental Implants 种植牙的参数优化
Q3 Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0084
Wafa Bensmain, Mohammed Benlebna, B. Serier, B. Abbès, B. Bouiadjra
Abstract Osseointegration is a fundamental phenomenon of dental implantology. It ensures the stability, the safety and the durability of dental implants and predictable clinical success in long-term. The geometric form of the implant is a defining parameter of osseointegration and implant-bone charge transfer. This is the essential constitutes of this study. In fact, we demonstrate using the finite elements method with tridimensional numerical computations, that the geometrical parameters of the implant conditionate the level and the repartition of the stresses, induced in the cortical bone and the spongy bone during the masticatory process, simulated here by dynamic charging. The effect of several parameters [size and conicity of the implant neck, size and radius of curvature of the implant apex] and the shape of the implant corps on the biomechanical behavior of the bone. The latest was analyzed in terms of variation of the equivalent stress induced in the bone. The purpose of this analysis was the developing of an implant form allowing stress relaxation, during the mastication process, in the living tissue.
骨整合是种植牙的基本现象。它保证了种植体的稳定性、安全性和耐久性,以及长期可预测的临床成功。种植体的几何形状是骨整合和种植体-骨电荷转移的决定性参数。这是本研究的基本组成部分。事实上,我们用三维数值计算的有限元方法证明,种植体的几何参数决定了咀嚼过程中皮质骨和海绵状骨的应力水平和再分配,在这里通过动态充电模拟。几个参数[种植体颈部的大小和圆锥度,种植体顶点的大小和曲率半径]和种植体团的形状对骨的生物力学行为的影响。最后从骨内等效应力变化的角度进行了分析。这项分析的目的是开发一种植入物形式,允许在咀嚼过程中在活组织中放松压力。
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引用次数: 0
Evolution of Tenacity in Mixed Mode Fracture – Volumetric Approach 混合模式断裂韧性演化-体积法
Q3 Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0073
O. Zebri, H. El Minor, A. Bendarma
Abstract In fracture mechanics most interest is focused on stress intensity factors, which describe the singular stress field ahead of a crack tip and govern fracture of a specimen when a critical stress intensity factor is reached. In this paper, stress intensity factors which represents fracture toughness of material, caused by a notch in a volumetric approach has been examined, taking into account the specific conditions of loading by examining various U-notched circular ring specimens, with various geometries and boundary conditions, under a mixed mode I+II. The bend specimens are computed by finite element method (FEM) and the local stress distribution was calculated by the Abaqus/CAE. The results are assessed to determine the evolution of the stress intensity factor of different notches and loading distances from the root of notch. This study shows that the tenacity is not intrinsic to the material for all different geometries notches.
在断裂力学中,人们最感兴趣的是应力强度因子,它描述了裂纹尖端前的奇异应力场,并在达到临界应力强度因子时控制试样的断裂。本文研究了在I+II混合模式下,考虑到特定的加载条件,用体积法研究了由缺口引起的材料断裂韧性的应力强度因子,并对具有不同几何形状和边界条件的各种u形缺口圆形圆环试样进行了测试。弯曲试件采用有限元法计算,局部应力分布采用Abaqus/CAE软件计算。对结果进行了评估,以确定不同缺口的应力强度因子的演变以及与缺口根部的加载距离。该研究表明,对于所有不同几何形状的缺口,韧性不是材料固有的。
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引用次数: 1
Numerical Study of Residual Thermal Stresses in MMC MMC残余热应力的数值研究
Q3 Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0086
Tayeb Nehari
Abstract In this paper, numerical study analysis of residual thermal stresses in aluminum matrix reinforced with silicon carbide particles with double-crack has been carried out. is studied in order to determine the thermo-mechanical behavior under the effect of different temperature gradients during cooling. For a more realistic simulation of the microstructure of these materials subjected to different loadings, a representative volume element may be used. In this paper, three different types of crack width a = 5 μm, 10 μm, 15 μm, has been carried. The thermal residual stresses are calculated by considering a wide range of cracks of different penetrations proximity to particle of 0.1, 0.2 and 0.5 μm. regarding the distribution of the stresses along the plane of the crack and in vicinity of the particle, results show that the penetration of the crack in the matrix causes an asymmetry. The inter-distance between crack and particle plays an important role regarding the generation of residual stresses. The lower the inter-distance, the higher the internal stresses of normal residual stresses of σzz.
摘要本文对含双裂纹碳化硅颗粒增强铝基体的残余热应力进行了数值研究分析。研究了在冷却过程中不同温度梯度影响下的热机械行为。为了更真实地模拟这些材料在不同载荷下的微观结构,可以使用代表性的体积元素。本文提出了三种不同类型的裂纹宽度a=5μm、10μm和15μm。通过考虑0.1、0.2和0.5μm颗粒附近不同贯穿件的大范围裂纹来计算热残余应力。关于应力沿裂纹平面和颗粒附近的分布,结果表明,裂纹在基体中的渗透导致了不对称性。裂纹和颗粒之间的间距对残余应力的产生起着重要作用。间距越小,σzz法向残余应力的内应力越高。
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引用次数: 1
Investigation of Surface Roughness and Material Removal Rate on Machining of TIB2 Reinforced Aluminum 6063 Composites: A Taguchi’s Approach TIB2增强铝6063复合材料加工表面粗糙度和材料去除率的研究——田口方法
Q3 Engineering Pub Date : 2018-12-01 DOI: 10.2478/mme-2018-0102
L. Emmanual, T. Karthikeyan
Abstract The utilization of TiB2 particles reinforced aluminum (Al6063) metal matrix composite materials in many different engineering fields has undergone a tremendous increase. Accordingly, the need of accurate machining of composites has increased enormously; an attempt has been made to assess the factors influencing surface roughness and material removal rate on machining the composite. The orthogonal array, the signal-to-noise ratio, and analysis of variance were employed to study the performance characteristics in turning operations of 5 and 10 wt. % TiB2 particles reinforced aluminum (Al6063) metal matrix composites. Taguchi method was used to find the optimal cutting factors for surface roughness (Ra) and material removal rate (MRR). Three cutting factors namely speed; feed and depth of cut were optimized with considerations of Ra and MRR. The experimental plan and analysis was based on the Taguchi L27 orthogonal array with three cutting factors using carbide tool (K20). The optimal parametric combination for K20 carbide insert was found to be feed, speed and depth of cut. The analysis of variance (ANOVA) result shows that feed the most significant process parameter on surface roughness followed by speed. For MRR result show that the speed and the feed are the significant parameters followed by the composition of composite material.
TiB2颗粒增强铝(Al6063)金属基复合材料在许多不同的工程领域的应用得到了极大的增加。因此,对复合材料精密加工的要求大大提高;对复合材料加工过程中影响表面粗糙度和材料去除率的因素进行了评价。采用正交阵列、信噪比和方差分析研究了5%和10% TiB2颗粒增强铝(Al6063)金属基复合材料车削加工时的性能特征。采用田口法寻找表面粗糙度(Ra)和材料去除率(MRR)的最佳切削因子。三个切削因素即速度;考虑Ra和MRR对进给量和切削深度进行了优化。采用K20硬质合金刀具,基于田口L27三切削因子正交阵列进行了试验方案和分析。发现K20硬质合金刀片的最佳切削参数组合为进给量、切削速度和切削深度。方差分析(ANOVA)结果表明,加工参数对表面粗糙度影响最大,其次是速度。结果表明,转速和进给量是复合材料的重要参数,其次是复合材料的成分。
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引用次数: 6
期刊
Mechanics and Mechanical Engineering
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