scholarly journals Comparison of beta-kurtosis and kurtosis methods for troubleshooting the performance of a transmission vehicle using vibrating frequencies

2018 ◽  
Vol 7 (2.13) ◽  
pp. 314
Author(s):  
Alireza Dadkhah Laleh ◽  
Mirmohammad Ettefagh ◽  
Reza Hasanezhad Qadim
Keyword(s):  
Mathematical Model ◽  
Preventive Maintenance ◽  
Vibration Analysis ◽  
Vibrational Analysis ◽  
Passenger Car ◽  
Maintenance And Repair ◽  
Vibra Tions ◽  
Shaft Failure

One of the main methods in maintenance and repair is a preventive maintenance method that is often more effective. The requirements of this method are to monitor the performance of machinery during operation. One of the car's functions that is monitored in this way is its vibra-tions. In this paper, a mathematical model of vibration analysis of a passenger car gearbox is presented based on Beta-Kurtosis and Kurtosis methods. In the next step, the data and test settings for the gearbox are based on the accelerometer installation to record the vibrations of the gearbox. To verify the accuracy of the proposed method, the results of the vibrational analysis of the car gearbox in four modes of a healthy gearbox, defective gearbox in the shaft end bearing, gear shaft failure on the gear shaft, simultaneous failure of the bearing and gearbox on the gear shaft were compared. Also, the results are compared for both Kurtosis and Beta-Kurtosis methods. The results show that both of the proposed methods are very accurate in identifying faults in the gearbox and determining the type of fault.  

Vibration Analysis for Preventive Maintenance: A Classical Case History

1987 ◽  
Vol 24 (04) ◽  
pp. 332-339
Author(s):  
Stephen L. Hofmann
Keyword(s):  
Preventive Maintenance ◽  
Vibration Analysis ◽  
Monitoring Program ◽  
Vibrational Analysis ◽  
Classical Case ◽  
Vibration Monitoring ◽  
Vibration Level ◽  
Engine Vibration ◽  
Main Engine ◽  
Marine Engineers

This paper describes the California Maritime Academy's Vibration Monitoring Program for Preventive Maintenance (PM) onboard the Training Ship Golden Bear(TSGB) and how the program detected a potentially dangerous main engine problem. The discovery of machinery operating faults by using vibrational analysis is not unique to marine engineers, but several factors in the Golden Bear's main engine vibration problem make this case a classical one:the nature and extent of the vibration levels;the timing of events and the way the fault developed;the final location of the fault in relationship to the spot on the engine where the high vibration level occurred; andverification of the fact that a PM vibration program can successfully diagnose faults in operating machinery in the marine environment.

Modeling inventory and environmental impacts of car maintenance and repair: A case study of Ford Focus passenger car

2021 ◽  
pp. 128085
Author(s):  
Krzysztof Danilecki ◽  
Jacek Eliasz ◽  
Piotr Smurawski ◽  
Wojciech Stanek ◽  
Andrzej Szlęk
Keyword(s):  
Environmental Impacts ◽  
Passenger Car ◽  
Maintenance And Repair

scholarly journals ON PREVENTIVE MAINTENANCE POLICY FOR WAVE DISSIPATING BLOCKS COVERING CAISSON BREAKWATER

2018 ◽  
pp. 72
Author(s):  
Takao Ota ◽  
Hiroyuki Kawamura ◽  
Yoshiharu Matsumi ◽  
Junji Koyanagi ◽  
Takashi Satow
Keyword(s):  
Mathematical Model ◽  
Preventive Maintenance ◽  
Maintenance Cost ◽  
Maintenance Policy ◽  
Reliability Engineering ◽  
Coastal Structures ◽  
Service Period ◽  
Caisson Breakwater ◽  
External Forces ◽  
Preventive Maintenance Policy

The infrastructures are required to keep a certain level of performance during the duration of service. Because the performance of the infrastructures including harbor and coastal structures deteriorates due to aging and damage that is caused by the action of external forces, it is necessary to perform appropriate maintenance. Satow et al. (2009) proposed a mathematical model for the preventive maintenance of wave dissipating blocks based on the method of the reliability engineering. They also derived the expected maintenance cost over the in service period and the optimal preventive maintenance policy. In this study, the optimal threshold for preventive maintenance to minimize the expected maintenance cost is determined for the wave dissipating blocks covering caisson breakwater by using the above model.

Optimal preventive maintenance and repair policies for multi-state systems

2015 ◽  
Vol 140 ◽  
pp. 78-87 ◽  
Author(s):  
Shey-Huei Sheu ◽  
Chin-Chih Chang ◽  
Yen-Luan Chen ◽  
Zhe George Zhang
Keyword(s):  
Preventive Maintenance ◽  
Maintenance And Repair

Analysis of a two-dimensional stair-case warranty policy with preventive maintenance

2020 ◽  
Vol 32 (1) ◽  
pp. 51-67
Author(s):  
Jinting Wang ◽  
Sheng Zhu ◽  
Simiao Du
Keyword(s):  
Mathematical Model ◽  
Preventive Maintenance ◽  
Optimal Strategy ◽  
Optimal Solution ◽  
Two Dimensional ◽  
Rectangular Region ◽  
Numerical Example ◽  
Warranty Cost

Abstract We develop a mathematical model to study optimal preventive maintenance (PM) strategy under a two-dimensional stair-case warranty policy considering both age and usage of a product. During the warranty term, sellers implement preventive maintenance within the stair-case region of the warranty policy and upon failure a product is repaired minimally and immediately. Our objective is to find the optimal PM strategy that minimizes the seller’s cost of warranty while jointly considering the age and usage intervals of the PM policy and the level of PM executed. We also discuss how our results compare to those in a two-dimensional warranty policy with a rectangular region, and we find that the stair-case policy is preferable for sellers. An algorithm is provided to find the optimal solution and a numerical example is presented to illustrate how to find an optimal strategy with our proposed method. We show numerically that the expected total warranty cost is convex both in the age and the usage of the product under certain conditions.

Joint Optimum Preventive-Maintenance and Repair-Limit Replacement Policies

1980 ◽  
Vol R-29 (3) ◽  
pp. 279-280 ◽  
Author(s):  
P.K. Kapur ◽  
K.R. Kapoor ◽  
D.V.S. Kapil
Keyword(s):  
Preventive Maintenance ◽  
Maintenance And Repair

Design and Development of the Enterprise Asset Management System Based on EAM

2013 ◽  
Vol 416-417 ◽  
pp. 2066-2071
Author(s):  
Guo Xiang He
Keyword(s):  
Life Cycle ◽  
Asset Management ◽  
Preventive Maintenance ◽  
Business Processes ◽  
Life Cycle Management ◽  
Maintenance And Repair ◽  
The Core ◽  
Whole Process ◽  
Repair Costs ◽  
Asset Management System

The paper describe the EAM function by proposing the main modules and major business processes, abstracting the main business processes.it implements preventive maintenance of assets, assets track, the whole process of life-cycle management based on the equipment,asset account and treat management maintenance as the core, the submission, approval,implementation of work order as main line. EAM can effectively improve the efficiency of equipment maintenance, reduce maintenance and repair costs, improve asset reliability and value.

Laser-Based Maintenance and Repair Technologies for Reactor Components

2004 ◽  
Author(s):  
Masaki Yoda ◽  
Naruhiko Mukai ◽  
Makoto Ochiai ◽  
Masataka Tamura ◽  
Satoshi Okada ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Preventive Maintenance ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Rapid Heating ◽  
Water Environment ◽  
Inspection System ◽  
Material Surface ◽  
Maintenance And Repair

Stress corrosion cracking (SCC) is the major factor to reduce the reliability of aged reactor components. Toshiba has developed various laser-based maintenance and repair technologies and applied them to existing nuclear power plants. Laser-based technology is considered to be the best tool for remote processing in nuclear power plants, and particularly so for the maintenance and repair of reactor core components. Accessibility could be drastically improved by a simple handling system owing to the absence of reactive force against laser irradiation and the flexible optical fiber. For the preventive maintenance, laser peening (LP) technology was developed and applied to reactor components in operating BWR plants. LP is a novel process to improve residual stress from tensile to compressive on material surface layer by irradiating focused high-power laser pulses in water. We have developed a fiber-delivered LP system as a preventive maintenance measure against SCC. Laser ultrasonic testing (LUT) has a great potential to be applied to the remote inspection of reactor components. Laser-induced surface acoustic wave (SAW) inspection system was developed using a compact probe with a multi-mode optical fiber and an interferometer. The developed system successfully detected a micro slit of 0.5mm depth on weld metal and heat-affected zone (HAZ). An artificial SCC was also detected by the system. We are developing a new LP system combined with LUT to treat the inner surface of bottom-mounted instruments (BMI) of PWR plants. Underwater laser seal welding (LSW) technology was also developed to apply surface crack. LSW is expected to isolate the crack tip from corrosive water environment and to stop the propagation of the crack. Rapid heating and cooling of the process minimize the heat effect, which extends the applicability to neutron-irradiated material. This paper describes recent advances in the development and application of such laser-based technologies.

RELIABILITY MEASURES OF A COLD STANDBY SYSTEM WITH PREVENTIVE MAINTENANCE AND REPAIR

2013 ◽  
Vol 20 (06) ◽  
pp. 1350022 ◽  
Author(s):  
S. C. MALIK ◽  
SUDESH K. BARAK
Keyword(s):  
Preventive Maintenance ◽  
Failure Time ◽  
Reliability Measures ◽  
Maintenance And Repair ◽  
Regenerative Point ◽  
Cold Standby ◽  
Semi Markov Process ◽  
Standby System ◽  
Regenerative Point Technique ◽  
Negative Exponential

The purpose of the present study is to determine reliability measures of a two-unit cold standby system with preventive maintenance and repair. The units are identical in nature subject to constant failure from normal mode. Preventive maintenance of the operative unit is carried out after a pre-specific time "t" up to which no failure occurs. However, repair of the unit is done at its failure. The unit works as new after repair and preventive maintenance. The switch devices are perfect. The distributions of failure time and the time by which unit undergoes for preventive maintenance are taken as negative exponential while that of preventive maintenance and repair times are assumed as arbitrary with different probability density functions. The random variables associated with failure, preventive maintenance and repair times are statistically independent. The semi-Markov process and regenerative point technique are adopted to derive the expressions for system performance measures in steady state. The graphical behavior of MTSF, availability and profit function have been observed with respect to preventive maintenance rate for particular values of other parameters and costs.

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