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Journal articles on the topic 'Gear whine noise'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Sun, Menglei, Chihua Lu, Zhien Liu, Yi Sun, Hao Chen, and Cunrui Shen. "Classifying, Predicting, and Reducing Strategies of the Mesh Excitations of Gear Whine Noise: A Survey." Shock and Vibration 2020 (August 6, 2020): 1–20. http://dx.doi.org/10.1155/2020/9834939.

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Gear whine noise has attracted increasing attention from researchers in both the academe and the industry over the past two decades. The wide range of research topics demonstrates that there is a huge technical challenge in understanding the source-path-receiver mechanisms deeply and predicting the gear whine noise precisely. Thoroughly understanding the sources of gear whine noise is the first step to solving this issue. In this paper, the authors summarize a certain number of published articles regarding the sources of gear whine noise. The excitations of gear whine noise are classified into

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2

Guo, Dong, Quan Shi, Wen Li Li, and Chuan He Xu. "Design Principles of Controlling Vehicle Gear Whine Noise Based on Loudness Metric." Applied Mechanics and Materials 477-478 (December 2013): 86–89. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.86.

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In-vehicle noise is composed of a variety of tonal (frequency-related) components and the tonal components play an important role in the improvement of sound quality for interior vehicle noise. Among them, gear whine noise is the key contributor to total in-vehicle noise and gain a lot of researchers interest. Through their effort, thespl (dBA)is relatively low. However, customers still perceive the tonal components and complain about the vehicle quality. Therefore a better understanding of how tonal components are perceived is necessary for automotive gear transmission designers. In this stud

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3

Guo, Dong, and Guohua Sun. "Vibroacoustic Modeling and Path Control of Air-Borne Axle Whine Noise." Advances in Mechanical Engineering 6 (January 1, 2014): 248362. http://dx.doi.org/10.1155/2014/248362.

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The axle whine noise will eventually affect the vehicle noise performance. In this study, a systematic modeling approach is developed to analyze the axle whine problem by considering the hypoid gear mesh from the tooth contact process as well as the system dynamics effect with gear design parameters and shaft-bearing-housing system taken into account. Moreover, the tuning of the dominant air-borne path is modeled analytically by using the sound transmission loss idea. First, gear tooth load distribution results are obtained in a 3-dimensional loaded tooth contact analysis program. Then mesh pa

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4

Zhang, Qi, Yong Bo Wang, Jian Hua Lv, Zhong Gang Zhu, Zhen Qin, and Sung Ki Lyu. "Study on the Reduction of Gear Whine Noise in Diesel Engine Gear Train." Journal of the Korean Society for Precision Engineering 36, no. 9 (2019): 867–73. http://dx.doi.org/10.7736/kspe.2019.36.9.867.

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5

Choi, Chanho, Houngjong Ahn, Jihun Yu, Jung-Su Han, Su-Chul Kim, and Young-Jun Park. "Optimization of gear macro-geometry for reducing gear whine noise in agricultural tractor transmission." Computers and Electronics in Agriculture 188 (September 2021): 106358. http://dx.doi.org/10.1016/j.compag.2021.106358.

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6

Hua, Xia, and Zaigang Chen. "Effect of roller bearing elasticity on spiral bevel gear dynamics." Advances in Mechanical Engineering 12, no. 7 (2020): 168781402093889. http://dx.doi.org/10.1177/1687814020938895.

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The dynamics of spiral bevel gears have gained increasing importance due to concerns relating to noise and durability. This is because the mesh force acting on the gear teeth is amplified under dynamic conditions, potentially reducing the fatigue life of the gears. Furthermore, a sizable dynamic force can be transmitted to the housing, inducing structure-born gear whine. The elasticity of the bearings can influence the dynamics of spiral bevel gears. In this article, the finite element formulation of a spiral bevel geared rotor dynamic system is applied to investigate the influence of bearing

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7

Guo, Han, Jianwu Zhang, and Haisheng Yu. "Robust optimisation of dynamic and NVH characteristics for compound power-split hybrid transmission." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 4 (2019): 817–26. http://dx.doi.org/10.1177/1464419319856774.

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In this paper, vibro-acoustic characteristics of a power-split hybrid transmission including a compound planetary gear set are investigated by numerical procedure and refined system dynamics modelling. For validation of the numerical predictions, bench tests are performed for dynamic and acoustic responses of the hybrid transmission, contribution rates of acoustic radiation power induced due to the planetary gears, support bearings, transmission shafts and the gearbox housing are estimated. In improving the noise, vibration and harshness (NVH) performance of the transmission during hybrid vehi

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8

Choi, B.-J., J.-H. Yoon, and J.-E. Oh. "A study on axle gear whine noise reduction with deflection test." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 226, no. 2 (2011): 225–33. http://dx.doi.org/10.1177/0954407011414470.

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9

Drossel, Welf-Guntram, Jan Troge, Eric Hensel, et al. "Structurally Integrated Piezoelectric Actuators for Reducing Rear Axle Gear Whine Noise." Advanced Engineering Materials 20, no. 12 (2018): 1800403. http://dx.doi.org/10.1002/adem.201800403.

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10

Yoon, J. H., B. J. Choi, I. H. Yang, and J. E. Oh. "Deflection test and transmission error measurement to identify hypoid gear whine noise." International Journal of Automotive Technology 12, no. 1 (2011): 59–66. http://dx.doi.org/10.1007/s12239-011-0008-x.

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11

Deng, Chenghao, Qingpeng Deng, Weiguo Liu, Cheng Yu, Jianjun Hu, and Xiaofeng Li. "Analysis of Vibration and Noise for the Powertrain System of Electric Vehicles under Speed-Varying Operating Conditions." Mathematical Problems in Engineering 2020 (November 20, 2020): 1–9. http://dx.doi.org/10.1155/2020/6617291.

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Whine noise from the electric powertrain system of electric vehicles, including electromagnetic noise and gear-meshing noise, significantly affects vehicle comfort and has been getting growing concern. In order to identify and avoid whine problems as early as possible in the powertrain development process, this paper presents a vibration and noise simulation methodology for the electric powertrain system of vehicles under speed-varying operating conditions. The electromagnetic forces on the stator teeth of the motor and the bearing forces on the gearbox for several constant-speed operating con

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12

Jolivet, Simon, Sabeur Mezghani, Jérôme Isselin, Alain Giraudeau, Mohamed El Mansori, and Hassan Zahouani. "Evaluation of Tooth Surface Micro-Finishing on Gear Noise." Key Engineering Materials 651-653 (July 2015): 498–503. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.498.

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For automotive gear manufacturers, reducing gear noise while maintaining the gear load-carrying capacity as well as the wear resistance has become more and more important. Macro- and micro-geometrical defects have long been studied in order to explain the vibratory behavior of gears. However, the contribution of the micro-scale roughness of the flanks, essential in the gear contact mechanics, has not yet been fully understood.This paper addresses this issue where gears were manufactured with two industrial finishing processes (grinding and power-honing) while having the same macro-scale charac

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13

Huang, Hai, Hai Xiang Li, and Qi Han Luo. "Point-Line Meshing Gear Drive." Applied Mechanics and Materials 121-126 (October 2011): 3391–95. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3391.

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Point-line meshing gear is a new-styled gear characterized by both easy manufacturing and divisibility of involute gears and high strength for contacting between convex and concave tooth profiles of a circular-arc gear. And contact strength of point-line meshing gears has improved by 1~2 times in comparison with involute gears, and bending strength of such gears has improved by approximately 15%, while noise has decreased even by 5～10dB (A). In addition, with the increase of load, noise will decrease by 3~4 dB (A). Only a few teeth or even 2~3 teeth are required for a pinion gear. There are si

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14

Komori, Masaharu, Fumi Takeoka, Aizoh Kubo, et al. "Laser Interferometric Measuring Method of Involute Artifact and Stabilization of Measurement." International Journal of Automation Technology 5, no. 2 (2011): 144–49. http://dx.doi.org/10.20965/ijat.2011.p0144.

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Vibration and noise are serious problems with involute spur and helical gears used, e.g., in drivetrains of vehicles such as automobiles. The gear tooth flank form of micrometer order markedly affects gear vibration and noise; therefore, the tooth flank form quality must be strictly controlled to maximize gear performance. Tooth profile measuring machines used in calibration for form error inspection of involute gears usually use an involute artifact, which itself must be calibrated highly accurately. However, it is typically difficult for current tooth profile measuring machine using contact

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15

Liguori, Aurelio, Enrico Armentani, Alcide Bertocco, Andrea Formato, Arcangelo Pellegrino, and Francesco Villecco. "Noise Reduction in Spur Gear Systems." Entropy 22, no. 11 (2020): 1306. http://dx.doi.org/10.3390/e22111306.

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This article lists some tips for reducing gear case noise. With this aim, a static analysis was carried out in order to describe how stresses resulting from meshing gears affect the acoustic emissions. Different parameters were taken into account, such as the friction, material, and lubrication, in order to validate ideas from the literature and to make several comparisons. Furthermore, a coupled Eulerian–Lagrangian (CEL) analysis was performed, which was an innovative way of evaluating the sound pressure level of the aforementioned gears. Different parameters were considered again, such as th

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16

Wei, Jing, Ai-Qiang Zhang, Yu-Liang Yang, Dong-Ming Zhou, and Xue-bin Ru. "A study of generating principles and loading capacity for one torus involute gears." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 19 (2016): 3528–40. http://dx.doi.org/10.1177/0954406215612828.

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Gear geometry is critical to the transmission performance. It not only affects the relative motion characteristics, lubrication, efficiency, and loading capacity but also affects the noise and vibration, as well as working reliability of system. The generating principles of one kind of torus involute (TI) gears is presented in this paper. The mathematical model and profiles equation of torus involute gears are derived and the profiles equation and its parameters are proposed. The correct meshing condition and tooth contact analysis (TCA) are analyzed. The loading capacity including contact str

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17

Liang, Yong, Kun Zhao, Yingchun Chen, Longjun Zhang, and Gareth J. Bennett. "An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear." International Journal of Aerospace Engineering 2019 (July 4, 2019): 1–11. http://dx.doi.org/10.1155/2019/4135094.

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The modern undercarriage system of a large aircraft normally requires the landing gear to be retractable. The nose landing gear, installed in the front of the fuselage, is retracted either forward or rearward. In the forward/rearward retraction system, the landing gear is normally installed to the trailing/leading side of the bay. When the incoming flow passes the landing gear as well as the bay, the installation that corresponds to the forward/rearward retraction system has a significant impact on the coupling flow and the associated noise of the landing gear and the bay. In this paper, acous

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18

Bian, Xiang, Zong De Fang, Kun Qin, Lifei Lian, and Bao Yu Zhang. "Multi-Objective Topology Optimization for Bevel Gear and Geometrical Reconstruction." Applied Mechanics and Materials 278-280 (January 2013): 139–42. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.139.

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Usually the gear modification is a main measure to reduce the vibration and noise of the gears, but in view of the complexity of the gear modification, topology optimization method was used to optimize the structure of the gear. The minimum volume was set as the direct optimization goal. To achieve the target of reducing contact stress, tooth root bending stress and improving flexibility, the upper bound of the stress and lower bound of the flexibility were set appropriately, thus realizing multi-objective optimization indirectly. A method for converting topology result into parametric CAD mod

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19

Chen, Xingbin, Xinhe Min, Peng Zhang, Nini Li, Zhihong Zhong, and Yuansheng Wu. "Study on Impact Characteristics of Multistage Double Crown Face Gear Pairs considering Ratio Switching under Variable Conditions." Shock and Vibration 2020 (August 5, 2020): 1–16. http://dx.doi.org/10.1155/2020/8880093.

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This paper presents a new transmission mechanism with multistage face gears as the core components for realizing variable speeds with differential meshing. To improve face gear transmission smoothness, suppress meshing resonance, reduce noise, and optimize power transmission performance during the gear shifting process, load distribution between meshing teeth during the transmission process and impact loads during various shifting stages must be determined. Herein, we present a gear impact model considering double crown gear meshing configuration, contact deformation, variable working conditio

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20

De Stefano, Giuliano, Nunzio Natale, Giovanni Paolo Reina, and Antonio Piccolo. "Computational Evaluation of Aerodynamic Loading on Retractable Landing-Gears." Aerospace 7, no. 6 (2020): 68. http://dx.doi.org/10.3390/aerospace7060068.

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Computational fluid dynamics is employed to evaluate the mean aerodynamic loading on the retractable landing-gears of a regional transport commercial aircraft. The mean turbulent flow around simplified landing-gear systems including doors is simulated by using the Reynolds-averaged Navier–Stokes approach, where the governing equations are solved with a finite volume-based numerical method. Using a dynamic meshing method, the computational grid is automatically and continuously adapted to the time-changing geometry, while following the extension/retraction of the landing-gear systems. The tempo

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21

Wang, Hui, and Sha Sha Du. "External Gear Pump Model and Simulation." Applied Mechanics and Materials 127 (October 2011): 228–32. http://dx.doi.org/10.4028/www.scientific.net/amm.127.228.

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This paper describes the development of gear pumps and the main causes of noise,and establish the overall dynamic model of external gear pump,mainly including the trapped oil model,the gear mesh model and the shell model and then go on with simulation analysis and research.Through establishment the gear pump model,it is benefit for predicting the gear pump trapped oil pressure and studying the impact of parameter changes on the pressure,and getting the natural frequencies and model shapes of the gear pump structural system,so that we can analysis external gear pump vibration and assess gear pu

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22

Wang, Yong, and Wenjun Zhang. "Modelling of gear stochastic vibration considering non-white noise errors." Chinese Science Bulletin 44, no. 4 (1999): 375–78. http://dx.doi.org/10.1007/bf02885496.

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23

Okorn, Ivan, Marko Nagode, and Jernej Klemenc. "Operating Performance of External Non-Involute Spur˝and Helical Gears: A Review." Strojniški vestnik – Journal of Mechanical Engineering 67, no. 5 (2021): 256–71. http://dx.doi.org/10.5545/sv-jme.2020.7094.

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In practical use, most gears have an involute shape of tooth flanks. However, external involute gears have some drawbacks, such as unfavourable kinematic conditions at the beginning and end of meshing, a limited minimum number of teeth, and the highly loaded convex-convex (i.e., non-conformal) contact. Researchers have developed and analysed various non-involute forms of tooth flanks, but they have not been widely accepted. The main reasons are higher manufacturing costs and sensitivity to manufacturing and assembly errors. Analyses of non-involute forms of teeth are mostly theoretical (analyt

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24

Li, Long Shuang, Hong Nie, and Xin Xu. "Simulation and Experiment on Landing Gear Component Noise." Applied Mechanics and Materials 170-173 (May 2012): 3454–59. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.3454.

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Simulation analysis and experiment research are performed on the aeroacoustic noise of a landing gear component in this paper. Detached Eddy Simulation (DES) is used to produce the flow field of the model. The Ffowcs-Williams/Hawkings (FW-H) equation is used to calculate the acoustic field. The sound field radiated from the model is measured in the acoustic wind tunnel. A comparison shows that the simulation results agree well with the experiment results under the acoustic far field condition. The results show that the noise radiated from the model is broadband noise. The directivity of the no

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25

Chen, Lue, Ge Shi Tang, Yan Yang Zi, and Fei Fan. "Improved EEMD Applied to Rotating Machinery Fault Diagnosis." Applied Mechanics and Materials 128-129 (October 2011): 154–59. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.154.

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Ensemble Empirical Mode Decomposition (EEMD) is a new noise-assisted data analysis (NADA) method. The effect of EEMD depends on two key parameters which are the amplitude of white noise and the ensemble times. However, the shortcoming of EEMD is that it lacks adaptability and reliability because these two key important parameters are obtained by experience and human intervention. An Improved Ensemble Empirical Mode Decomposition method is proposed in this paper, by adding white noise and ascertaining ensemble number adaptively. The criterion of adding white noise in Improved EEMD is establishe

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26

Shen, Jian, Lun Zhang, and Niaoqing Hu. "Fault Diagnosis of Planet Gear Using Continuous Vibration Separation and Minimum Entropy Deconvolution." Applied Sciences 10, no. 22 (2020): 8062. http://dx.doi.org/10.3390/app10228062.

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Planet gear is the most unique dynamic component in planetary gearbox. It rotates around sun gear while rotating around its own central axis, causing modulation effect in monitoring signal. Planetary gear is usually connected to heavy external loads and other transmissions, fault feature of planet gear may be overwhelmed by noises and other signals. Focused on planet gear inside planetary gearbox, a method for fault diagnosis is proposed in this paper based on continuous vibration separation (CVS) and minimum entropy deconvolution (MED). In this method, CVS is designed to separate dynamic resp

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27

Zhou, Jianxing, Wenlei Sun, and Qing Tao. "Gearbox Low-Noise Design Method Based on Panel Acoustic Contribution." Mathematical Problems in Engineering 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/850549.

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This paper presents a comprehensive procedure to calculate steady dynamic response and generated noise radiation from a gear reducer. In this process, the dynamic model of the cylindrical gear transmission system is built in consideration of the time-varying mesh stiffness, gear errors, and bearing supporting, while the data of dynamic bearing force is obtained through solving the model. Furthermore, taking the data of bearing force as the excitation, the gearbox vibrations and noise radiation are calculated by numerical simulation, and then the time history of node dynamic response, noise spe

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28

Pilipenko, O., D. Kolesnik, A. Berezniak, and V. Shokha. "DAMAGING AND DESTRUCTION OF REDUCTION TRAINS OF MI-8 HELICPTER AND ITS MODIFICATIONS." Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки, no. 3 (May 28, 2020): 92–105. http://dx.doi.org/10.37701/dndivsovt.3.2020.12.

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The results of quantitative factographic study of the Mi-8 helicopter (its modifications) reduction trains with different types of gear coupling, the destruction of which occurred while in flight due to the presence of preliminary material damage at the stage of production of the gear wheels and during their operational employment are presented in a generalized form. Contact teeth destruction as the main cause of failures of high-speed gear wheels in well-lubricated enclosed gears are considered. The causes of the wearing and sticking of the teeth along their lateral surfaces as well as scorin

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29

Pilipenko, O., D. Kolesnik, A. Berezniak, and V. Shokha. "DAMAGING AND DESTRUCTION OF REDUCTION TRAINS OF MI-8 HELICPTER AND ITS MODIFICATIONS." Наукові праці Державного науково-дослідного інституту випробувань і сертифікації озброєння та військової техніки, no. 4 (August 19, 2020): 92–106. http://dx.doi.org/10.37701/dndivsovt.4.2020.11.

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The results of quantitative factographic study of the Mi-8 helicopter (its modifications) reduction trains with different types of gear coupling, the destruction of which occurred while in flight due to the presence of preliminary material damage at the stage of production of the gear wheels and during their operational employment are presented in a generalized form. Contact teeth destruction as the main cause of failures of high-speed gear wheels in well-lubricated enclosed gears are considered. The causes of the wearing and sticking of the teeth along their lateral surfaces as well as scorin

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30

Liu, Fuhao. "Dynamic analysis of drag torque for spur gear pairs considering the double-sided films." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 12 (2016): 2253–62. http://dx.doi.org/10.1177/0954406216631370.

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Taking into account different drag torque, this paper investigates the influence of the lubricant films located in the backlash between meshing gear teeth pair on the gear dynamical behaviors. Numerical simulations show that the influence of the lubricant film on the coast side is significant under low loading, but under increased drag torques the influence is diminished. The shape of the hysteresis loop of double-sided films suggests that this model can make more sense. The sensitive of the drag torque is studied to illustrate the inverse relationship between drag torque and gear rattle: incr

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31

Chen, Hongfang, Yanqiang Sun, Zhaoyao Shi, and Jiachun Lin. "Intelligent Analysis Method of Gear Faults Based on FRWT and SVM." Shock and Vibration 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/1582738.

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An intelligent analysis method for gear faults based on fractional wavelet transform (FRWT) and support vector machine (SVM) is proposed. Based on this method, FRWT is used to eliminate noise from the gear vibration signal, and the vibration signal after noise elimination is carried thought wavelet packet decomposition and reconstruction. A sequence corresponding to the signal is constructed consisting of the module with the highest level wavelet coefficients after decomposition and feature vectors corresponding to the energy sequence which were obtained by calculation. Then, a particle optimi

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32

Tuononen, Ari J., and Antti Lajunen. "Modal analysis of different drivetrain configurations in electric vehicles." Journal of Vibration and Control 24, no. 1 (2016): 126–36. http://dx.doi.org/10.1177/1077546316635857.

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This paper presents a modal analysis of different drivetrain configurations in electric vehicles; 1) an in – wheel motor, 2) direct drive, and 3) an electric motor with a reduction gear and a differential gear. A specific simulation model was developed to analyze the vibrations while taking into account the traction motor, possible mechanical reduction gears, and the driveshaft, as well as a Rigid Ring Model (RRM) to describe the tire. On the basis of the simulation results, the frequency responses were calculated for each drivetrain configuration and also for a non-drive, free-rolling tire. T

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33

Xiong, Yangshou, Kang Huang, Tao Wang, Qi Chen, and Rui Xu. "Dynamic Modelling and Analysis of the Microsegment Gear." Shock and Vibration 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/9691647.

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The development of technology requires higher load capacity, rotating speed, power-weight ratio, lower vibration, and noise with respect to the gear transmission. The new type microsegment gear’s tooth profile curve is composed of many microsegments. Previous researches indicate that the microsegment gear has a good static performance, while the dynamic behavior of the microsegment gear has never been investigated. This paper will focus on the dynamic performance of the gear. The profile deviation between microsegment gear and involute gear is regarded as a displacement excitation in the propo

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34

Yu, Chun Jian, Xiao Diao Huang, Cheng Gang Fang, and Ke Fang Dai. "Research on Damping and Vibration Characteristic of the Large and Precision NC Rotary Table." Advanced Materials Research 97-101 (March 2010): 1216–22. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1216.

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According to the current situation of acicular chip and high-frequency chattering of the NC rotary table while gear milling, rigidity and damping performances of the table were analyzed and the damping program of Coulomb friction was bring up. Online test of the gear milling cutting force can be used to establish dynamic model of circumferential vibration of the table with Coulomb friction. Then mechanism of restraining gear cutting chatter by damping of Coulomb friction and acicular chip generating mechanism were exposed. Furthermore, relationship between backlash and rotary rigidity of the t

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35

Ren, Yafeng, Shan Chang, Geng Liu, Haiwei Wang, and Xueliang Bao. "Numerical Noise Transfer Analysis of a Flexible Supported Gearbox Based on Impedance Model and Noise Transfer Function." Mathematical Problems in Engineering 2020 (March 20, 2020): 1–15. http://dx.doi.org/10.1155/2020/1294609.

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To investigate the gearbox radiation noise properties under various rotational speeds, a noise prediction method based on impedance model and noise transfer function (NTF) is proposed. One only needs to extract the NTF of the housing once rapid gearbox noise prediction under different working conditions is realized. Taking a flexible supported gearbox as a research object, the external excitation of the housing (the bearing excitation load and isolator excitation load) is calculated through a gear-housing-foundation-coupled impedance model, and the noise transfer function is simulated through

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36

CHEN, LUE, YAN-YANG ZI, ZHENG-JIA HE, YA-GUO LEI, and GE-SHI TANG. "ROTATING MACHINERY FAULT DETECTION BASED ON IMPROVED ENSEMBLE EMPIRICAL MODE DECOMPOSITION." Advances in Adaptive Data Analysis 06, no. 02n03 (2014): 1450006. http://dx.doi.org/10.1142/s179353691450006x.

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An improved EEMD approach is introduced in this paper based on automatically obtaining the adding white noise amplitude and the ensemble number according to different analyzing signal characteristics. The adding white noise affects decomposition effect is researched in detail, a criterion of adding white noise in EEMD is established, and the improved EEMD algorithm is described. Simulated signals demonstrate the effectiveness of the improved EEMD in diagnosing the faults of rotating machinery. The improved EEMD is successfully applied to an early rub-impact fault detection of machine unit for

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37

Wei, Xiao Hui, Yin Yin, Heng Chen, and Hong Nie. "Modeling and Simulation of Aircraft Nose Landing Gear Emergency Lowering Using Co-Simulation Method." Applied Mechanics and Materials 215-216 (November 2012): 1213–18. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.1213.

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This paper builds dynamical models and hydraulic system models of retraction/lowering of some regional aircraft nose landing gear respectively based on the software LMS VL motion and AMESim. The simulation analysis result was proved to be credible by checking with that of ground test. The peak oil return pressure with the critical damping force can be obtained by analyzing the hydraulic damping characteristic of actuator cylinder during landing gear emergency lowering based on methods of estimation and co-simulation. The results indicate that the damping characteristic of actuator cylinder pla

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38

Chen, Ming. "Fractional-Order Adaptive P -Laplace Equation-Based Art Image Edge Detection." Advances in Mathematical Physics 2021 (August 31, 2021): 1–10. http://dx.doi.org/10.1155/2021/2337712.

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In recent years, with the rapid development of image processing research, the study of nonstandard images has gradually become a research hotspot, for example, fabric images, remote sensing images, and gear images. Some of the remote sensing images have a complex background and low illumination compared with standard images and are easy to be mixed with noise during acquisition; some of the fabric images have rich texture information, which adds difficulty to the related processing, and are also easy to be mixed with noise during acquisition. In this paper, we propose a fractional-order adapti

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Ali, Sabah, and Hiba Alwan. "Measurements of Vibration and Noise Level at Different Cement Companies." Tikrit Journal of Engineering Sciences 27, no. 2 (2020): 14–21. http://dx.doi.org/10.25130/tjes.27.2.02.

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The aim of this article is to compare Vibration and Noise measurements caused by different types of Machines at cement factories with the standard evaluation criteria of Vibration ISO 2631 – 4 EVS – EN 5349 – 2 and Noise following the standard ISO 9612 – 2009. Two cement companies were chosen, the first is located at Baddish district, 30km west of Mosul city (Iraq), which is called Baddish general cement company, while the other is located south of Mosul, and is called Hammam Al-Alil general cement company. Three stations were chosen for each company (raw materials grinding mills, cement grind

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Neriya, S. V., R. B. Bhat, and T. S. Sankar. "On the Dynamic Response of a Helical Geared System Subjected to a Static Transmission Error in the Form of Deterministic and Filtered White Noise Inputs." Journal of Vibration and Acoustics 110, no. 4 (1988): 501–6. http://dx.doi.org/10.1115/1.3269557.

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The vibration of a helical geared shaft system is studied, considering the coupling between the torsional, flexural, rotational (about the diametral axis), and axial motions of the gear carrying shafts. The effects of the nonlinear backlash function and time varying tooth stiffness are also considered. The excitation to the geared shaft system is in the form of a static transmission error which has deterministic and filtered white noise components. The equations of motion are formulated in state space form and solved using matrix exponential approach. Piecewise linearization is used in the sim

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Yang, Jianming, and Ping Yang. "Random Vibration and Dynamic Analysis of a Planetary Gear Train in a Wind Turbine." Shock and Vibration 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/6292953.

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Premature failure of gearboxes is a big challenge facing the wind power industry. It highly depends on fully understanding the embedded dynamics to solve this problem. To this end, this paper investigates the random vibration and dynamics of planetary gear trains (PGTs) in wind turbines under the excitation of wind turbulence. The turbulence is represented by the Von Karmon spectrum and implemented by passing white noise through a 2nd-order shaping filter. Then, extra equations are formed and added to the original governing equations of motion. With this augmented equation set, a recursive num

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Kumar, A. S., M. O. M. Osman, and T. S. Sankar. "On Statistical Analysis of Gear Dynamic Loads." Journal of Vibration and Acoustics 108, no. 3 (1986): 362–68. http://dx.doi.org/10.1115/1.3269351.

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Statistical analysis of the gear dynamic load is carried out using piecewise constant mesh stiffness approximation. The dynamics of the spur gear system is modeled as a nonlinear, nonstationary process, and the gear transmission error which acts as a random input to the gear system is generated by passing a Gaussian white noise process through a time invariant shaping filter. The equivalent discrete time state equation and the mean and covariance propagation equations are then written for the augmented system. Then starting from known initial conditions these propagation equations are used to

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Elasha, Faris, Matthew Greaves, and David Mba. "Planetary bearing defect detection in a commercial helicopter main gearbox with vibration and acoustic emission." Structural Health Monitoring 17, no. 5 (2018): 1192–212. http://dx.doi.org/10.1177/1475921717738713.

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Helicopter gearboxes significantly differ from other transmission types and exhibit unique behaviours that reduce the effectiveness of traditional fault diagnostics methods. In addition, due to lack of redundancy, helicopter transmission failure can lead to catastrophic accidents. Bearing faults in helicopter gearboxes are difficult to discriminate due to the low signal-to-noise ratio in the presence of gear vibration. In addition, the vibration response from the planet gear bearings must be transmitted via a time-varying path through the ring gear to externally mounted accelerometers, which c

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Lv, Yong Hu, Ji Bin Li, Guo Wei Zhong, Jia Li Yang, Chang Sheng Wang, and Hai Xiong Wang. "Research of Slider-Crank Massager Noise Fault Diagnosis and Treatment." Advanced Materials Research 658 (January 2013): 487–93. http://dx.doi.org/10.4028/www.scientific.net/amr.658.487.

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The abnormal periodic noise from the slider-crank massager was complained by many consumers when it was under unilateral massage. By anglicizing the worm non-working surface stained with marking compound, the reason of the abnormal periodic noise which stemming from repeated mating of non-normal mating surfaces of the worm gear mechanism is founded. In order to solve the problem the overrunning clutch is used as it’s beyond separation functions. When the force is loaded to passive wheel, the clutch is linked; while the load becomes kinetic energy, the power will be separated immediately. The c

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Huang, Mingyang, Hong Nie, and Ming Zhang. "Analysis of ground handling characteristic of aircraft with electric taxi system." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 6 (2018): 1546–61. http://dx.doi.org/10.1177/0954407018764163.

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Electric landing gear drive equipped with traction motors can provide taxi capability without the use of main engines or tractor. The ground handling characteristic of aircraft with electric taxi system is analyzed. The new mathematic model of aircraft ground maneuver is established, considering the 6-degree-freedom aircraft body and the flexible main strut and the powered wheel. Quasi-steady method is applied to calculate tire side forces and moments, to determine side slip. The simulation for the ground steering response of aircraft with electric taxi system is done by employing ADAMS and Si

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Peng, Yanfeng, Junhang Chen, Ruiqiong Luo, et al. "Complementary ensemble adaptive sparsest narrow-band decomposition method and its applications to the gear crack fault diagnosis." Advances in Mechanical Engineering 12, no. 3 (2020): 168781402091053. http://dx.doi.org/10.1177/1687814020910537.

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Adaptive sparsest narrow-band decomposition is the most sparse solution to search for signals in the over-complete dictionary library containing intrinsic mode functions, which transform the signal decomposition into an optimization problem, but the calculation accuracy must be improved in the case of strong noise interference. Therefore, in combination with the algorithm of the complementary ensemble empirical mode decomposition, a new method of the complementary ensemble adaptive sparsest narrow-band decomposition is obtained. In the complementary ensemble adaptive sparsest narrow-band decom

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Wang, Zhijian, Junyuan Wang, and Wenhua Du. "Research on Fault Diagnosis of Gearbox with Improved Variational Mode Decomposition." Sensors 18, no. 10 (2018): 3510. http://dx.doi.org/10.3390/s18103510.

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Variational Mode Decomposition (VMD) can decompose signals into multiple intrinsic mode functions (IMFs). In recent years, VMD has been widely used in fault diagnosis. However, it requires a preset number of decomposition layers K and is sensitive to background noise. Therefore, in order to determine K adaptively, Permutation Entroy Optimization (PEO) is proposed in this paper. This algorithm can adaptively determine the optimal number of decomposition layers K according to the characteristics of the signal to be decomposed. At the same time, in order to solve the sensitivity of VMD to noise,

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Римаренко, Євген Олександрович. "СУЧАСНИЙ СТАН ПРОБЛЕМИ РОЗРОБКИ ЗВУКОПОГЛИНАЮЧИХ КОНСТРУКЦІЙ ДЛЯ ГАЗОТУРБІННИХ ДВИГУНІВ". Aerospace technic and technology, № 8 (31 серпня 2020): 111–20. http://dx.doi.org/10.32620/aktt.2020.8.15.

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A review of current international aviation noise requirements is provided. It is shown that international requirements for aircraft noise levels are constantly increasing. The rapid growth of the international fleet leads to an increase in the number of take-offs and landings of aircraft at airports, and as a result, the problem of aircraft noise still relevant. To reduce noise levels at airports, various methods are used, one of which is the operational limitations of aircraft concerning the levels of noise they create. In European Union countries there are operational restrictions for aircra

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Vanraj, S. S. Dhami, and B. S. Pabla. "Non-contact incipient fault diagnosis method of fixed-axis gearbox based on CEEMDAN." Royal Society Open Science 4, no. 8 (2017): 170616. http://dx.doi.org/10.1098/rsos.170616.

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Gearbox plays most essential role in the modern machinery for transmitting the required torque along with motion and contributes to wide range of applications. Any failure in gearbox components affects the productivity and efficiency of the system. Most machine breakdowns related to gears are a result of improper operating conditions and loading, hence lead to failure of the whole mechanism. Ensemble Empirical Mode Decomposition (EEMD) comprises advancement and valuable addition in Empirical Mode Decomposition (EMD) and has been widely used in fault detection of rotating machines. However, int

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Zhao, Jie, Jianhui Lin, Jinbao Yao, and Jianming Ding. "Two-Dimensional Impact Reconstruction Method for Rail Defect Inspection." Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/236574.

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The safety of train operating is seriously menaced by the rail defects, so it is of great significance to inspect rail defects dynamically while the train is operating. This paper presents a two-dimensional impact reconstruction method to realize the on-line inspection of rail defects. The proposed method utilizes preprocessing technology to convert time domain vertical vibration signals acquired by wireless sensor network to space signals. The modern time-frequency analysis method is improved to reconstruct the obtained multisensor information. Then, the image fusion processing technology bas

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