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Journal articles on the topic 'Cracked shaft'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Muñoz-Abella, B., L. Rubio, P. Rubio, and L. Montero. "Elliptical Crack Identification in a Nonrotating Shaft." Shock and Vibration 2018 (October 24, 2018): 1–10. http://dx.doi.org/10.1155/2018/4623035.

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It is known that fatigue cracks are one of the most important problems of the mechanical components, since their propagation can cause severe loss, both personal and economic. So, it is essential to know deeply the behavior of the cracked element to have tools that allow predicting the breakage before it happens. The shafts are elements that are specially affected by the described problem, because they are subjected to alternative compression and tension stresses. This work presents, firstly, an analytical expression that allows determining the first four natural frequencies of bending vibrati

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2

Nanda, Jajneswar, and D. R. Parhi. "Theoretical Analysis of the Shaft." Advances in Fuzzy Systems 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/392470.

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This paper represents the dynamic response of a steel shaft which is fixed at both ends by bearing. The shaft is subjected to both axial and bending loads. The behavior of the shaft in the presence of two transverse cracks subjected to the same angular position along longitudinal direction is observed by taking basic parameters such as nondimensional depth (bi/D), nondimensional length (Li/L), and three relative natural frequencies with their relative mode shapes. The compliance matrix is calculated from the stress intensity factor for two degrees of freedom. The dynamic nature of the cracked

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3

Kulesza, Zbigniew. "An Induced Shaft Deflection for Rotating Shaft Crack Detection." Solid State Phenomena 199 (March 2013): 3–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.3.

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Over the years various techniques have been developed to extract information on the dynamic state of the rotating machinery. This paper introduces a new method based on the phase data of the shaft rotation angle. Usually the phase data is omitted and only the frequency components of the vibration spectrum are taken into consideration. However, the transverse shaft crack has a specific angular location about the shaft axis. Therefore, it is supposed that by measuring the vibration response of the rotor deflected by an additional constant force applied perpendicularly to the shaft axis at differ

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4

Gayen, Debabrata, Debabrata Chakraborty, and Rajiv Tiwari. "Parametric study on free vibration and instability of a functionally graded cracked shaft in a rotor-disc-bearing system: finite element approach." MATEC Web of Conferences 172 (2018): 03009. http://dx.doi.org/10.1051/matecconf/201817203009.

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Free vibration and stability analysis are studied for a rotor-disk-bearing system having a radially functionally graded (FG) shaft with a transversely fully open crack, based on finite element (FE) approach. Both viscous and hysteretic internal damping are incorporated in the FE model of FG cracked shaft using two nodded Timoshenko beam element having four degrees of freedom (DOFs) at each node. Material properties of the FG cracked shaft are assumed temperature dependent and graded along radial direction following different material gradation law. FG shaft is made of two constituents material

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5

Parhi, D. R., and A. K. Behera. "DYNAMIC DEFLECTION OF A CRACKED SHAFT SUBJECTED TO MOVING MASS." Transactions of the Canadian Society for Mechanical Engineering 21, no. 3 (1997): 295–316. http://dx.doi.org/10.1139/tcsme-1997-0014.

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The dynamic behaviour of a cracked shaft is greatly affected by the mass moving on it. Magnitude and the travelling velocity of the mass along with the position of the crack on the shaft are the major parameters, considered in this investigation. The local flexibility due to the crack is evaluated from the theory of fracture mechanics. Then the normal modes for the cracked shaft are found and are used for formulating the equation of the moving mass system. Runge-Kutta method is used to solve the differential equation for the dynamic deflection of a simply supported cracked shaft, subjected to

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6

Gao, Jie, La Sheng Zhao, Qiang Zhang, and Xiao Peng Wei. "Stiffness Characteristics of a Rotor Shaft with Slant Crack Including Elliptical Front Edge." Advanced Materials Research 706-708 (June 2013): 1566–69. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1566.

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The stiffness characteristics of a rotating cracked shaft including elliptical front edge between transverse crack and 45° slant crack have been studied here. The strain energy release rate (SERR) method has been used to calculate the stiffness matrix of two types of the crack element. Time-varying characteristics of stiffness of the straight front edge and elliptical front edge of the cracked shaft were studied in a stable rotation cycle. The analytical result of this paper shows that change of the cracked shaft stiffness raises during the increase of the crack depth. The stiffness characteri

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7

Liong, Rugerri Toni, and Carsten Proppe. "Finite Element Multibody Simulation of a Breathing Crack in a Rotor with a Cohesive Zone Model." ISRN Mechanical Engineering 2013 (March 13, 2013): 1–10. http://dx.doi.org/10.1155/2013/249035.

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The breathing mechanism of a transversely cracked shaft and its influence on a rotor system that appears due to shaft weight and inertia forces is studied. The presence of a crack reduces the stiffness of the rotor system and introduces a stiffness variation during the revolution of the shaft. Here, 3D finite element (FE) model and multibody simulation (MBS) are introduced to predict and to analyse the breathing mechanism on a transverse cracked shaft. It is based on a cohesive zone model (CZM) instead of linear-elastic fracture mechanics (LEFM). First, the elastic cracked shaft is modelled by

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8

Mohiuddin, M. A., and Y. A. Khulief. "Dynamic Response Analysis of Rotor-Bearing Systems With Cracked Shaft." Journal of Mechanical Design 124, no. 4 (2002): 690–96. http://dx.doi.org/10.1115/1.1423950.

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A general dynamic model for a large-scale rotor-bearing system with a cracked shaft is introduced. A finite shaft element with a crack is developed using a consistent finite element approach. The model accommodates shafts with tapered portions, multiple disks and anisotropic bearings. The formulation is applicable to rotor-bearing systems with different practical design configurations including intermediate bearings, shaft overhang, and stepped shaft assemblies. A reduced order form of equations of motion is obtained by invoking the actual non-planar (complex) modal transformations. The time-r

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9

Dirr, B. O., and B. K. Schmalhorst. "Crack Depth Analysis of a Rotating Shaft by Vibration Measurement." Journal of Vibration and Acoustics 110, no. 2 (1988): 158–64. http://dx.doi.org/10.1115/1.3269493.

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The increasing development of measurement techniques for monitoring rotor plants requires improved possibilities for the interpretation of vibration response. Therefore, computer programs that have been used will have to be constantly updated. This especially concerns the modelling of a rotor for calculation purposes. This paper deals with a propagating crack that causes the slender uniform round shaft to vibrate about its main axis. Experiments using a stationary shaft are also performed. Beach marks are used to measure the crack depth and the actual shape of the cracked cross section. These

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10

Saavedra, P. N., and L. A. Cuitiño. "Vibration Analysis of Rotor for Crack Identification." Journal of Vibration and Control 8, no. 1 (2002): 51–67. http://dx.doi.org/10.1177/1077546302008001526.

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A theoretical and experimental dynamic analysis of a rotor-bearing system with a transversely cracked shaft is presented. To model the system for FEM analysis, a finite element for a cracked cylindrical shaft is developed. The additional flexibility due to the crack is evaluated from the linear fracture mechanics, using a breathing crack model derived in a rigorous way. A simplified opening/closing crack model is proposed to reduce the computational effort. The resulting parametrically excited system is nonlinear, and the equations of motion are solved using Hilbert, Hughes, and Taylor integra

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11

ZHAO, Guanghui, and Guipeng LIAO. "Elastic-plastic fracture analysis of external thread of drive shaft shell of a positive displacement motor." Mechanics 26, no. 5 (2020): 375–82. http://dx.doi.org/10.5755/j01.mech.26.5.24671.

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For a positive displacement motor (PDM), the threaded joint connecting drive shaft shell (DSS) and universal shaft shell that is close to the bit is inclined to fracture. In this paper, elastic-plastic fracture performance of the threaded connection is simulated under both make-up torque and bending moment. Firstly, an FE model, which includes a cracked external thread of the DSS and an engaging internal thread of the universal shaft shell, is established and validated. Secondly, influences of both plastic deformation and the helix angle on fracture properties of the cracked thread are evaluat

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12

Tchomeni, Bernard Xavier, and Alfayo Alugongo. "Modelling and Dynamic Analysis of an Unbalanced and Cracked Cardan Shaft for Vehicle Propeller Shaft Systems." Applied Sciences 11, no. 17 (2021): 8132. http://dx.doi.org/10.3390/app11178132.

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The vibrational behaviour of misaligned rotating machinery is described and analysed in this paper. The model, constructed based on the equations of vehicle dynamics, considered the dynamic excitation of a single Hooke’s joint. The system adopted the breathing functions from a recent publication to approximate the actual breathing mechanism of a cracked driveshaft. The study aimed to understand the transmission of a nonlinear signal from the unbalanced and cracked driveshaft to an unbalanced driven shaft via a Hooke’s joint. The governing equation of the system was established based on the ene

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13

Shah, Bhumi Ankit, and Dipak P. Vakharia. "Online condition monitoring for detection of crack in the shaft using vibration analysis method." Industrial Lubrication and Tribology 70, no. 7 (2018): 1193–200. http://dx.doi.org/10.1108/ilt-11-2017-0348.

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Purpose The purpose of this study is to identify the crack in the shaft at incipient stage. Transverse crack is the most common type of crack found on the periphery of the shaft. The changes in dynamic behaviour of the rotor at high speed are enormous. The reliable operation of the machinery is paramount for the safety of individual and plant. Condition-based maintenance monitors the mechanical and operational condition of the machine. During such inspection, if any unhealthy symptoms are detected, then affected part is identified and taken out for the maintenance at most appropriate time. Des

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14

Ranjan, Rajeev. "Dynamic Behaviour and Crack Detection of a Multi Cracked Rotating Shaft using Adaptive Neuro-Fuzzy-Inference System." International Journal of Manufacturing, Materials, and Mechanical Engineering 6, no. 4 (2016): 1–10. http://dx.doi.org/10.4018/ijmmme.2016100101.

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The presence of crack changes the physical characteristics of a structure which in turn alter its dynamic response characteristics. So it is important to understand dynamics of cracked structures. Crack depth and location are the main parameters influencing the vibration characteristics of the rotating shaft. In the present study, a technique based on the measurement of change of natural frequencies has been employed to detect the multiple cracks in rotating shaft. The model of shaft was generated using Finite Element Method. In Finite Element Analysis, the natural frequency of the shaft was c

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15

Li, Changhe, O. Bernasconi, and N. Xenophontidis. "A Generalized Approach to the Dynamics of Cracked Shafts." Journal of Vibration and Acoustics 111, no. 3 (1989): 257–63. http://dx.doi.org/10.1115/1.3269850.

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A new analytic-experimental method for describing crack breathing and obtaining shaft local stiffness change is presented. A generalized nonlinear formulation using the finite element method, which can be widely used for both horizontal and vertical cracked shafts, is derived. Some results previously explicited in other studies are confirmed and clarified. This advanced model can serve as a solid basis for further studies.

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16

Papadopoulos, C. A., and A. D. Dimarogonas. "Coupled Longitudinal and Bending Vibrations of a Cracked Shaft." Journal of Vibration and Acoustics 110, no. 1 (1988): 1–8. http://dx.doi.org/10.1115/1.3269474.

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This paper describes the coupling of bending and longitudinal vibration of a stationary cracked shaft with an open crack. The crack is modeled by way of a 2×2 local flexibility matrix with coupling terms. The elements of this matrix are obtained analytically. One of the elements compares well with experimental data of other investigators. The free vibration of the shaft, and the influence of the crack on the vibrational behavior of the shaft is studied. The relation of the eigenvalues of the system and the crack depth as functions of the slenderness ratio are presented. The forced vibration of

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17

Yang, Kang, and Yi Yang. "Application of FEM Analysis to Fault Diagnosis of Cracked Rotor." Applied Mechanics and Materials 37-38 (November 2010): 181–84. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.181.

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Based on the simple crack model and the finite element method (FEM) theorem, the corresponding dynamic equation of the cracked rotor based on FEM analysis is modeled and the numerical simulation solutions are obtained. By analyzing the dynamic characteristics of cracked rotor in diverse conditions, the properties of the un-cracked rotor and cracked rotor are discussed. A valid fault diagnosis method of cracked rotor is purposed. The method demonstrates that the cracked rotor can be identified by estimating if the swing of disk center obviously accretion and appear wave crest when rotate speed

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18

Thatoi, Dhirendranath, and Prabir Kumar Jena. "Inverse Analysis of Crack in Fixed-Fixed Structure by Neural Network with the Aid of Modal Analysis." Advances in Artificial Neural Systems 2013 (March 3, 2013): 1–8. http://dx.doi.org/10.1155/2013/150209.

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In this research, dynamic response of a cracked shaft having transverse crack is analyzed using theoretical neural network and experimental analysis. Structural damage detection using frequency response functions (FRFs) as input data to the back-propagation neural network (BPNN) has been explored. For deriving the effect of crack depths and crack locations on FRF, theoretical expressions have been developed using strain energy release rate at the crack section of the shaft for the calculation of the local stiffnesses. Based on the flexibility, a new stiffness matrix is deduced that is subseque

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19

Bachschmid, N., P. Pennacchi, E. Tanzi, and S. Audebert. "Transverse Crack Modeling and Validation in Rotor Systems, Including Thermal Effects." International Journal of Rotating Machinery 9, no. 2 (2003): 113–26. http://dx.doi.org/10.1155/s1023621x03000101.

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This article describes a model that allows the simulation of the static behavior of a transverse crack in a horizontal rotor under the action of weight and other possible static loads and the dynamic behavior of cracked rotating shaft. The crack breathes—that is, the mechanism of the crack's opening and closing is ruled by the stress on the cracked section exerted by the external loads. In a rotor, the stresses are time-dependent and have a period equal to the period of rotation; thus, the crack periodically breathes. An original, simplified model allows cracks of various shapes to be modeled

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20

Nanda, J., L. D. Das, H. C. Das, A. Biswal, and A. Tripathy. "Analysis of Detecting Multi Crack with Location and Size in Simply Supported Shaft Using ANFIS." Applied Mechanics and Materials 541-542 (March 2014): 649–57. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.649.

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A methodology to detect multi crack, with crack location and size due to transverse loading is presented in this paper taking the advantage of Adaptive neuro-fuzzy inference system (ANFIS) using modal analysis of cracked shaft. A simple supported shaft is subjected with axial and bending load for same angular position along with its longitudinal direction. The natural frequency of the shaft with its various crack positions and size are accurately determined analytically using strain energy release rate and stress intensity factor. The vibration parameters such as first three relative natural f

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21

Wu, Xi, and Jim Meagher. "A Two-Disk Extended Jeffcott Rotor Model Distinguishing a Shaft Crack from Other Rotating Asymmetries." International Journal of Rotating Machinery 2008 (2008): 1–11. http://dx.doi.org/10.1155/2008/846365.

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A mathematical model of a cracked rotor and an asymmetric rotor with two disks representing a turbine and a generator is utilized to study the vibrations due to imbalance and side load. Nonlinearities typically related with a “breathing” crack are included using a Mayes steering function. Numerical simulations demonstrate how the variations of rotor parameters affect the vibration response and the effect of coupling between torsional and lateral modes. Bode, spectrum, and orbit plots are used to show the differences between the vibration signatures associated with cracked shafts versus asymmet

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22

Yang, Laihao, Xuefeng Chen, and Shibin Wang. "A novel amplitude-independent crack identification method for rotating shaft." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 22 (2018): 4098–112. http://dx.doi.org/10.1177/0954406217748686.

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The shaft crack is one of the most common and serious malfunctions in rotating machines and may lead to catastrophic failure if undetected in time. However, the conventional crack identification methods are amplitude-dependent and thus can be only applied to the crack identification under some specific conditions. In this paper, a novel amplitude-independent crack identification method (AiCIM) is significantly proposed to eliminate the amplitude-dependent property and promote the effectiveness of the crack identification. First and foremost, a fast time-varying vibration phenomenon of the crac

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23

Parhi, Dayal R., and Adik R. Yadao. "Analysis of dynamic behavior of multi-cracked cantilever rotor in viscous medium." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 230, no. 4 (2016): 416–25. http://dx.doi.org/10.1177/1464419315618033.

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The present investigation is an attempt to evaluate the dynamic behaviours of multi-cracked cantilever rotor shaft with an additional mass attached at the tip of the shaft, which is partially submerged in the viscous fluid. In this work, theoretical expressions are developed to find the fundamental natural frequency and amplitude of the multi-cracked rotor shaft with attached mass, using influence coefficient method. Navier–Stoke’s equations are used for the analysis of external fluid forces acting on the rotor. Viscosities of the fluid and relative crack locations are taken as main variable p

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24

Yongfeng, Yang, Wu Qinyu, Wang Yanlin, Qin Weiyang, and Lu Kuan. "Dynamic characteristics of cracked uncertain hollow-shaft." Mechanical Systems and Signal Processing 124 (June 2019): 36–48. http://dx.doi.org/10.1016/j.ymssp.2019.01.035.

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25

Yadao, Adik Ramdayal, Ravi P. Singh, and D. R. Parhi. "Influence of Parameters of Cracked Rotor System on its Vibration Characteristics in Viscous Medium at Finite Region." Applied Mechanics and Materials 592-594 (July 2014): 2061–65. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2061.

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The paper summarizes a complete analysis about vibrational characteristics of a spinning simply supported cracked shaft with fluid medium at finite region. The damping effect occurs due to external fluid is integrated in the existing analysis, with the help of navier - stokes equation. The simply supported cracked shaft is analyzed by the influence coefficient strain energy method. Here we have changing the parameter of shaft i.e. damping viscosity of fluid and the length of the shaft which accountable for the alteration of the amplitude of vibration.

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26

Wang, Shuai, and Menghui Liang. "Crack identification in cyclic symmetric structures based on relative indicators of frequency separation." Mechanical Sciences 12, no. 1 (2021): 173–84. http://dx.doi.org/10.5194/ms-12-173-2021.

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Abstract. Cyclic symmetric structures are an important class of structures in the fields of civil and mechanical engineering. In order to avoid accidents due to cracks in such structures, an effective method for crack identification is presented in this paper. First, the dynamic model of cyclic symmetric structures with gapless cracks is developed using a structure's sector model and rotation transformation. Then, the effects of cracks on the free vibration characteristics of a cracked cyclic symmetric structure are addressed, with particular interests in the distortion of mode shapes and the

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27

Nelson, H. D., and C. Nataraj. "The Dynamics of a Rotor System with a Cracked Shaft." Journal of Vibration and Acoustics 108, no. 2 (1986): 189–96. http://dx.doi.org/10.1115/1.3269321.

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A theoretical analysis of the dynamics of a rotor-bearing system with a transversely cracked rotor is presented. The rotating assembly is modeled using finite rotating shaft elements and the presence of a crack is taken into account by a rotating stiffness variation. This stiffness variation is a function of the rotor’s bending curvature at the crack location and is represented by a Fourier series expansion. The resulting parametrically excited system is nonlinear and is analyzed using a perturbation method coupled with an iteration procedure. The system equations are written in terms of compl

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28

Wan, Zhiguo, Yu Wang, Binqiang Chen, Yihua Dou, and Xinjuan Wei. "The Vibration of a Transversely Cracked Rotor Supported by Anisotropic Journal Bearings with Speed-Dependent Characteristic." Applied Sciences 10, no. 16 (2020): 5617. http://dx.doi.org/10.3390/app10165617.

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This paper presents the vibration of a transversely cracked rotor supported by anisotropic journal bearings, where the speed-dependent characteristic of bearing is considered. A 3D finite element model and the contact-based approach are employed for the shaft and crack. The governing differential equations of the whole cracked rotor-bearing system were obtained by synthesizing the equations of the cracked shaft, the breathing crack and the journal bearings. In order to solve the computational difficulties caused by the high dimensions of model, the free-interface complex component mode synthes

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29

Li, Ming, Guang Meng, Hongguang Li, Jianxi Qiu, and Fucai Li. "Online Structural Health Monitoring of Rotating Machinery via Ultrasonic Guided Waves." Shock and Vibration 2018 (June 13, 2018): 1–12. http://dx.doi.org/10.1155/2018/8142371.

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This paper focuses on the establishment of the online structural health monitoring strategy for rotating shafts using ultrasonic guided waves. The dispersion of cylindrical shaft is investigated and a conclusion that the longitudinal ultrasonic wave propagating along the cylindrical shaft can hardly be interfered by the rotation is obtained. The experimental system and the numerical simulation model have been constructed, based on the fact that the experimental research and the numerical verification have been conducted intensively. The strategy can be concluded no matter the cracked rotor is

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30

Kulesza, Zbigniew. "Harmonic Balance Analysis for the Rigid Finite Element Model of the Rotating Cracked Shaft." Solid State Phenomena 199 (March 2013): 99–104. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.99.

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The paper presents a multi-dimensional harmonic balance analysis utilized to study the vibration responses of the cracked rotor subject to gravity, unbalance and an additional lateral harmonic force generated by an active magnetic bearing. The nonlinear terms resulting from the shaft crack are included via an alternating frequency/time domain (AFT) method. The example addressed in this paper is a simple rotor modeled by using the rigid finite element (RFE) approach. Combination frequencies are recognized as evident symptoms of the shaft crack.

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31

Zhiwei, Huang. "Dynamic response of a cracked rotor-bearing-seal system." MATEC Web of Conferences 288 (2019): 01006. http://dx.doi.org/10.1051/matecconf/201928801006.

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With the structural parameters of the rotation machinery increased, the seal fluid induced force imposed on the rotor will significantly increase. Taking a cracked rotor-bearing-seal system as object the non-linear dynamic behaviours of the coupled system are investigated using numerical integration method. For the crack in shaft, the segmented switch function is applied to express the process of the crack’s opening and closing in rotation, and the cross stiffness originated from crack is considered. Various nonlinear phenomena compressing periodic, quasi-periodic and chaotic motions in the ro

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32

Yang, Kang, and Yi Yang. "Simulation of Crack Dynamic Characteristics of Rotor Based on FEM Analysis." Advanced Materials Research 139-141 (October 2010): 2677–80. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2677.

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A new simulation method is proposed for dynamic characteristics of cracked rotor based on the finite element analysis, in which the stiffness model has been derived for the exact description of variation rules of cracked shafts. A non-linear dynamic equation is constituted according to stiffness characteristic of cracked-rotor change in time domain. Then the corresponding dynamic equation of the cracked rotor based on FEM analysis is modeled and the numerical simulation is carried out with solutions of high accuracy. At last, the dynamic characteristics of cracked rotor in diverse conditions a

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33

Tsai, T. C., and Y. Z. Wang. "VIBRATION ANALYSIS AND DIAGNOSIS OF A CRACKED SHAFT." Journal of Sound and Vibration 192, no. 3 (1996): 607–20. http://dx.doi.org/10.1006/jsvi.1996.0209.

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34

Sabnavis, Giridhar, R. G. Kirk, Mary Kasarda, and Dane Quinn. "Cracked Shaft Detection and Diagnostics: A Literature Review." Shock and Vibration Digest 36, no. 4 (2004): 287–96. http://dx.doi.org/10.1177/0583102404045439.

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35

LISSENDEN, C. J., S. P. TISSOT, M. W. TRETHEWEY, and K. P. MAYNARD. "Torsion response of a cracked stainless steel shaft." Fatigue & Fracture of Engineering Materials and Structures 30, no. 8 (2007): 734–47. http://dx.doi.org/10.1111/j.1460-2695.2007.01149.x.

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36

Lu, Wenxiu, and Fulei Chu. "Shaft Crack Identification Based on Vibration and AE Signals." Shock and Vibration 18, no. 1-2 (2011): 115–26. http://dx.doi.org/10.1155/2011/460178.

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The shaft crack is one of the main serious malfunctions that often occur in rotating machinery. However, it is difficult to locate the crack and determine the depth of the crack. In this paper, the acoustic emission (AE) signal and vibration response are used to diagnose the crack. The wavelet transform is applied to AE signal to decompose into a series of time-domain signals, each of which covers a specific octave frequency band. Then an improved union method based on threshold and cross-correlation method is applied to detect the location of the shaft crack. The finite element method is used

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37

Niu, Qian, and Shi-xi Yang. "Study on Fatigue Degradation Behavior of a Cracked Rotor Subjected to Lateral Vibration." Shock and Vibration 2018 (August 29, 2018): 1–21. http://dx.doi.org/10.1155/2018/3239523.

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Fatigue crack in a rotary shaft is a common failure observed in rotor systems. Since vibration of the shaft causes alternating fatigue loads, the crack propagates slowly. Meanwhile, the propagating crack may cause nonlinear or unstable vibration of the rotor system. In fact, growth of the crack and vibration of the shaft are coupled with each other. Hence, it is necessary to study the fatigue degradation behavior of the cracked rotor accounting for this coupling effect. In this paper, a coupling model of rotor vibration and crack growth is established through dynamic theory and fracture mechan

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38

Yu, Tao, Ying Yang, Qing Kai Han, Hong Liang Yao, and Bang Chun Wen. "ANN-Based Crack Identification in Rotor System with Multi-Crack in Shaft." Key Engineering Materials 353-358 (September 2007): 2463–66. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2463.

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Rotating machinery, such as steam turbo, compressor, and aeroengine etc., are widely used in many industrial fields. Among the important rotor faults, the fatigue crack fault, which can lead to catastrophic failure and cause injuries and severe damage to machinery if undetected in its early stages, is most difficult to detect efficiently with traditional methods. In the paper, based on the truth of the change of the mode shapes of the cracked structure, a new method by combining accurate finite element model of rotor with multi-crack in shaft and artificial neural network (ANN) is proposed to

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39

Kato, Akira. "Prevention of Fracture of Cracked Steel Bars Using Laser: Part II—Laser Welding." Journal of Engineering Materials and Technology 108, no. 1 (1986): 63–67. http://dx.doi.org/10.1115/1.3225843.

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This paper investigates the effect of laser welding on the prevention of fracture of cracked steel specimens. Precracks occurred in shaft specimens of SAE 1015 were welded by a CO2 laser, and then the rotary bending fatigue and static tensile tests were executed. Both strengths of fatigue and tensile of specimens having a diameter 11mm with a fairly large precrack 13mm long could be raised up to that of virgin specimens. It was shown that laser welding is very effective for the fracture prevention of cracked steel shafts.

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40

Chondros, T. G., and A. D. Dimarogonas. "Dynamic Sensitivity of Structures to Cracks." Journal of Vibration and Acoustics 111, no. 3 (1989): 251–56. http://dx.doi.org/10.1115/1.3269849.

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Cracks that develop on machine members and structures influence their dynamic behavior. The Rayleigh principle is used for an estimation of the change in the natural frequencies and modes of vibation of the structure if the crack geometry is known, assuming that the eigenvalue problem for the uncracked structure has been solved in advance. The method reduces the computational effort needed for the full eigensolution of cracked structures and gives acceptable accuracy. It can be extended to higher modes and to decompose degenerate modes found in symmetric structures. To demonstrate the change i

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Banaszek, Slawomir. "Dynamics of Large Power Rotating Machine with Cracked Shaft." Key Engineering Materials 293-294 (September 2005): 337–46. http://dx.doi.org/10.4028/www.scientific.net/kem.293-294.337.

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The paper presents the course and results of crack propagation simulation research. The object taken into account is a large power turbo-set rotor. The computer code system NLDW is presented. It uses a non-linear model of journal bearings, and well known crack model. Crack depth is marked by a crack coefficient. It is shown the crack generates a coupled forms of lateral, axial and torsional vibrations in multi-support rotor. Their intensity depends on the axial and circumferential crack location on the shaft. The attempt at pointing a proper diagnostic indicator for crack detection in large ro

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Kulesza, Zbigniew, Mariusz Czajkowski, and Błażej Bartoszewicz. "Modal analysis of a rotor with a cracked shaft." Journal of Vibroengineering 19, no. 1 (2017): 150–59. http://dx.doi.org/10.21595/jve.2016.16959.

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Siva, Ganda Anand, and Shinigam Ramakrishna. "Residual life estimation of structural beam using experimental and numerical modal analysis methods." Journal of Mechanical and Energy Engineering 4, no. 2 (2020): 135–46. http://dx.doi.org/10.30464/jmee.2020.4.2.135.

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A structural beam is a common element in many mechanical structures such as ship propeller shaft, crane boom, and air craft wings. In the present paper experimental and numerical modal analysis are carried out for estimating the damage detection, geometric location of the damage, severity of damage and residual life of structural beam to prevent unexpected failures of the mechanical structures. Experimental and numerical modal analysis results for healthy and cracked beam are compared for validation of numerical methodology used in the present paper. Experimental modal analysis is performed on

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Behzad, M., and A. R. Ghias. "Time-Frequency Feature Extraction of a Cracked Shaft Using an Adaptive Kernel." Applied Mechanics and Materials 5-6 (October 2006): 37–44. http://dx.doi.org/10.4028/www.scientific.net/amm.5-6.37.

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Adaptive time-frequency representations have many advantages compared with conventional methods. In this paper, a new method is proposed to adapt Smoothed Pseudo Wigner- Ville distribution to match signal’s time-frequency content. It is based on maximizing a local timefrequency concentration measure for different time and frequency smoothing window lengths. Subsequently, the optimized values are used for constructing an adaptive kernel over time. The proposed transform is then applied to vibration signals of healthy and cracked shafts which are acquired through run-up, and the crack signature

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Mechefske, Chris K., David Benjamin Rapos, and Markus Timusk. "Gear fault detection using dynamic transmission variance." Journal of Quality in Maintenance Engineering 24, no. 1 (2018): 101–18. http://dx.doi.org/10.1108/jqme-01-2016-0003.

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Purpose The purpose of this paper is to report the findings of a study that used measurements of shaft relative rotational position, made using inexpensive Hall Effect sensors and magnets mounted at the ends of a gearbox input and output shafts, to determine gear “transmission variance.” The transmission variance signals, as a function of gear/shaft rotational position, were then used to detect and diagnose gear faults. Design/methodology/approach Two sets of spur gears (one plastic and one steel) were used to experimentally determine the relative shaft rotational position between the input an

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Papadopoulos, C. A., and A. D. Dimarogonas. "Stability of Cracked Rotors in the Coupled Vibration Mode." Journal of Vibration and Acoustics 110, no. 3 (1988): 356–59. http://dx.doi.org/10.1115/1.3269525.

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A transverse surface crack is known to add to a shaft a local flexibility due to the stress-strain singularity in the vicinity of the crack tip. This flexibility can be represented, in the general case by way of a 6 × 6 compliance matrix describing the local flexibility in a short shaft element which includes the crack. This matrix has off-diagonal terms which cause coupling along the directions which are indicated by the off-diagonal terms. In addition, when the shaft rotates the crack opens and closes. Then the differential equations of motion have periodically varying stiffness coefficients

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LIN, Yanli. "Stiffness models for the cracked shaft of the rotor system." Chinese Journal of Mechanical Engineering 44, no. 01 (2008): 114. http://dx.doi.org/10.3901/jme.2008.01.114.

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B., Prabhu S., and A. S. Sekhar. "Severity Estimation of Cracked Shaft Vibrations within Fluid Film Bearings." Tribology Transactions 38, no. 3 (1995): 583–88. http://dx.doi.org/10.1080/10402009508983446.

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Shih, Yan-Shin, and Jien-Jong Chen. "The stress intensity factor study of an elliptical cracked shaft." Nuclear Engineering and Design 214, no. 1-2 (2002): 137–45. http://dx.doi.org/10.1016/s0029-5493(02)00022-5.

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Gayen, Debabrata, and Debabrata Chakraborty. "Variation of Local Flexibility Coefficients of Functionally Graded Cracked Shaft." Procedia Engineering 144 (2016): 1443–50. http://dx.doi.org/10.1016/j.proeng.2016.05.176.

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