vibration and condition monitoring

... learning for anomaly detection and condition monitoring A step-by-step tutorial from data import to model output My previous article on anomaly detection and condition monitoring has received a lot ... anomaly detection and condition monitoring, I recommend first reading my original article on the topic This provides the neccesary background information on how machine learning and data driven ... the dataset from the NASA Acoustics and Vibration Database See the downloaded Readme Document for IMS Bearing Data for further information on the experiment and available data Each data set consists

Ngày tải lên: 09/09/2022, 08:19

... Trang 1AND FAULT DIAGNOSIS HAMID A TOLIYAT • SUBHASIS NANDI SEUNGDEOG CHOI • HOMAYOUN MESHGIN-KELK CRC Press , Trang 3ELECTRIC MACHINESMODELING, CONDITION MONITORING, AND FAULT DIAGNOSIS ... MONITORING, AND FAULT DIAGNOSIS Trang 5ELECTRIC MACHINESMODELING, CONDITION MONITORING, AND FAULT DIAGNOSIS HAMID A TOLIYAT SUBHASIS NANDI SEUNGDEOG CHOI HOMAYOUN MESHGIN-KELK -^-1 hÀ\G HAI V ê \AM ... to p re v e n t m o to r failures Trang 2410 Electric Machines: Modeling, Condition Monitoring, and Fault D ia ^icsisVibration a n d th e r m a l m o n ito r in g r e q u ir e a d d itio n a

Ngày tải lên: 22/05/2018, 23:55

... 22 2.4 Vibration and Impedance Features 24 2.4.1 Vibration Features 24 2.4.2 Impedance Features 26 2.5 Feasibility of Multi-scale Vibration and Impedance Responses 27 2.5.1 Test Structure and Experimental ... Experimental Setup and Damage Scenarios 80 6.3 Vibration and Impedance Responses 83 6.4 Cable Force Monitoring by Multi-scale Smart Sensor System 89 6.4.1 Vibration-based Cable Force Monitoring 89 ... Communication and Power Consumption 107 7.4.3 Vibration Monitoring under Typhoon Condition 109 7.4.4 Long-term SHM under Weather Change 112 7.5 Cable Force Monitoring for Test Bridge 116 7.5.1 Vibration-based

Ngày tải lên: 31/01/2021, 23:30

... VCaP, and DUCaP, all expressed high levels of AR and PSA and low levels of CK5, uPA and EphA2 In contrast, sensitive cell lines expressed low levels of AR and PSA, with the exception of LNCaP, and ... is, low AR and PSA and high uPA, EphA2 and/or CK5) In the remaining approximately 56% of tumors, the expression of AR and PSA were concordantly relatively high and the expression of uPA and EphA2 ... dasatinib and expressed high levels of PSA and AR, is the only exception to this observation out of five cell lines (MDAPCa2b, LNCaP, VCaP, DUCaP, and 22Rv) found to express higher levels of PSA and

Ngày tải lên: 14/08/2014, 08:20

... 55,417 and 35,312, respectively ESTs mapping to the diverse condition and those from the testes were next in size, followed by the Schneider cells, larva/pupa, and ovary The mbn2 hemocytic cells and ... Materials and methods) The numbers of TSSs with specific associations are shown (b) Condition associations for random permutations of labels Condition assignments were repeated on 100 sets of random ... conservation and condition-specificity of single and alternative transcription start sites in the Drosophila genome Elizabeth A Rach * , Hsiang-Yu Yuan * , William H Majoros † , Pavel Tomancak ‡ and Uwe

Ngày tải lên: 14/08/2014, 21:20

... of condition based maintenance implies the decision ofmaintenance in this system is based on the condition and the subsystem performing thecondition monitoring is usually named Tool Condition Monitoring ... decision of maintenance in this system is based on the conditionand the subsystem performing the condition monitoring is usually named tool conditionmonitoring (TCM) in the literature This subsystem ... Hadi, and my siblings Ordin, Golnar and Negar for their eternallove, support and encouragement; and my parents in-law, Parvin and Bahram for theirunderstanding and support iv Trang 5Lastly, I gratefully

Ngày tải lên: 08/09/2015, 18:19

... tool condition monitoring, covering sensors for tool condition monitoring, cutting force modeling for ball-nose end milling, signal processing, feature extraction and selection and tool wear monitoring ... contributions and suggestions for future work Trang 242.2 Tool condition monitoring system Firstly, commercial tool condition monitoring systems are introduced in this section Secondly, tool condition monitoring ... coefficients and the type and extent of tool damage.” 2.3 Sensors in tool condition monitoring A large variety of sensors and various sensing methods for in-process monitoring tool wear and breakage

Ngày tải lên: 09/09/2015, 10:11

... Mitra and Bharati Sengupta, and my mother Mina Roy Chowdhury for being so awesome, caring and supporting My special thanks also go to three of my very close childhood friends Sandip Saha, Sandip ... on cr and M cr Filled symbols denote cr and M cr values under clockwise torsion and open symbols denote cr and M cr values under anticlockwise torsion 101 Figure 5.1: Displacement and rotation ... to calculate the vibration frequencies and mode shapes of SWCNTs from MD simulation trajectories Comparing the vibration frequencies of various chiral SWCNTs, we find that the vibration frequencies

Ngày tải lên: 09/09/2015, 11:19

... distinguish shocks at entry and exit level with tool breakage signals Vibration: The occurrence of vibration during milling affects the surface and tool life In general, vibrations could be due ... Dimla [37], Lee et al [38]and Li et al[39] Accelerometers are the sensors used to measure the vibration and such sensors have the advantage of simplicity and low cost Vibrations in machining process ... model, and physically explaining the trained model [9, 16] However, in ball nose milling, the cutting conditions frequently changes and collecting of fresh tool data under controlled cutting conditions

Ngày tải lên: 14/09/2015, 08:39

... milling Tool conditions such as wear and chipping/breakage and wear mechanisms in milling are reviewed and the sensors used to monitor these conditions are discussed, especially vision and force ... al., 1987; Tlusty and Tarng, 1988; Reif, and Cahine, 1988; Coker and Shin, 1996; Li et al., 2000a AE sensors Sampath and Vajpayee, 1987; Diei and Dornfeld, 1987a, 1987b; Liu and Liang, 1991; Wilcox ... Basic techniques and systems of TCM are presented and various sensors and their corresponding signal processing methods are reviewed, including direct and indirect sensors, and sensor fusion

Ngày tải lên: 16/09/2015, 08:30

... wear and tool state prediction from the standard and revised SVM (workpiece ASSAB760, insert SNMN120408 of material A30, Figure B-5 AE, tool wear and tool state prediction from the standard and ... state prediction from the standard and revised SVM (v=80 m/min, f=0.1 mm/rev, d=1mm) Figure D-5 Cutting force, tool wear and tool state prediction from the standard and revised SVM (v=80 m/min, ... wear and tool state prediction from the standard and revised SVM (workpiece ASSAB705, insert SNMG120408 of material AC3000, v=200 m/min, f=0.3 mm/rev, d=1mm) Figure B-10 AE, tool wear and

Ngày tải lên: 16/09/2015, 17:13

... mean, and peak values and their corresponding variance, kurtosis and skew could provide sufficient warning information of tool breakage and tool wear in various cutting condition Jemielniak and ... signals into transient and continuous components To identify tool wear status, six features (mean and standard deviation of skew, kurtosis and bandpower) from spectral and statistical analysis ... Elwardany et al., 1996; Moore and Kiss, 1996; Li and Dong, 2000), ultrasonic vibration (Ultrasonic Energy) (Hayashi et al., 1988; Coker and Shin, 1996; Abuzahra and Yu, 2000), acoustic wave (sound)

Ngày tải lên: 16/09/2015, 17:13

... colleagues and friends in Control and Mechatronics Lab, especially Mr Wang Wenhui and Mr Cheng Zhaolin, for their help, support, and friendship I would like to show my appreciation to my parents and ... detection and for tool wear estimation Leem [1995] used a customized neural network in online monitoring of cutting tool wear Power spectrum and four statistics (mean, standard deviation, skew, and ... Results 76 Trang 17Tool condition monitoring is primarily for tool wear monitoring [Lange, 1992] Tool failure resulted from wear represents about 20% of machine tool down-time and negatively impacts

Ngày tải lên: 06/10/2015, 20:50

... Voltage and build up of dielectric strength of the medium Dielectric Strength TRV Trang 16Unsuccessful arc quenching Trang 17Dielectric Strength of different mediums Trang 19Condition Monitoring ... at the time of Arcing and main contact close/ trip  Insertion of Arcing contact  Insertion of Main Contact  Contact travel  Resistance during closed conditions and its comparison with ... and hence avoiding major failures Trang 55Conclusion  DCRM Test (non-invasive diagnosis) for CBs proved useful in indicating condition of main/ arcing contacts for erosion, misalignment and

Ngày tải lên: 01/03/2016, 22:22

... Degree of Doctor of Philosophy Machine Fault Diagnosis and Condition Prognosis using Adaptive Neuro-Fuzzy Inference System and Classification and Regression Trees by Van Tung Tran Department of ... University February 2009 Trang 2Machine Fault Diagnosis and Condition Prognosis using Adaptive Neuro-Fuzzy Inference System and Classification and Regression Trees 기계 결함진단 및 예지를 위한 ANFIS 와 CART ... Machine Condition Prognosis 103 6 Experiment 105 Trang 77 Case Studies of Machine Condition Prognosis 108 7.1 Case study 1: CART and OS prediction 108 7.2 Case study 2: parallel CART and MS

Ngày tải lên: 22/06/2016, 16:36

... run speed (sidebands) (Vibration levels are low) Trang 9Step One Step Two Develop Rotor Models Calculate Free-Free and Installed In Gearbox Natural Frequencies (Critical Speeds) and Mode Shapes. ... could be used to identify the stage of bearing failure Ref TA Vibration Chart. ! " " Trang 5Roll End BrgOuter race damage Spalling and fatigue failure evident Roller impressions occurred during ... rotor model to calculate the natural frequencies, mode shapes, rotor deflection and bearing loading. Perform free-free and installed experimental modal testing of a shaft-roll assembly Use bump testing

Ngày tải lên: 18/03/2017, 00:41

... sections: Combustion and Emissions; Exhaust Gas After treatment & EGR, and Engine Control and Conditioning Monitoring Systems Every effort has been made to avoid printing mistakes and errors in the ... Engine – Combustion, Emissions and Condition Monitoring Fig 10-a and Fig 10-b represent respectively front and top views of the evolution of the spray penetration and velocity field at various ... cylinder pressure and temperature, O2 mass fraction, NOx and soot histories for the single injection and 75%-20-25% cases 20 Diesel Engine – Combustion, Emissions and Condition Monitoring Fig 11-b...

Ngày tải lên: 08/03/2014, 19:20

... groups representing different motor conditions [16][21] This thesis will target at online condition monitoring and diagnosis of motor fault by developing a feasible and reliable technique by addressing ... online motor condition monitoring and fault detection system Among the time-frequency analysis techniques, wavelet transform (WT) becomes more and more popular for its better time and frequency ... operating conditions and applicable to motor under various operating modes Therefore, new techniques have been proposed in the present thesis for more reliable motor condition monitoring and fault...

Ngày tải lên: 26/09/2015, 10:59

... weaken the tool material further and eventually leading to tool failure 2.1.2 Overview of Tool Condition Monitoring Tool condition monitoring (TCM) aims at identifying and predicting the cutting tool ... cutting force or torque monitoring, vibration monitoring, spindle/drive power or current monitoring, acoustic emission monitoring, and temperature monitoring Most of the existing on-line TCM systems ... methods, and diagnostic methods The prognostic methodologies for general health monitoring applications are then reviewed These methodologies involve reliability analysis, and condition monitoring...

Ngày tải lên: 09/09/2015, 10:14

... diagnostic scheme, and the rationale for condition monitoring using MCSA and vibration analysis, and sets the stage for stating the objectives of this research Fault statistics and literature survey ... the kth vibration due to bearing defect xi LIST OF RELEVANT PUBLICATIONS W.-Y Chen, J.-X Xu, S.K Panda, ―A Study on Automatic Machine Condition Monitoring and Fault Diagnosis for Bearing and Unbalanced ... Bearing and raceway wear and tear present initially as general roughness and progresses to metal fatigue, and ultimately spall and chip on the surface of the rolling elements [93] Figure 2.4 and...

Ngày tải lên: 03/10/2015, 21:57