An Integrated Approach to Shipboard System and Equipment Testing for Improved Maintenance Management

1989 ◽  
Vol 26 (02) ◽  
pp. 105-119
Author(s):  
Charles Blatchley ◽  
Joseph Connors ◽  
Anthony Vecino
Keyword(s):  
Comprehensive Evaluation ◽  
Integrated Approach ◽  
Condition Assessment ◽  
Maintenance Management ◽  
Service Levels ◽  
Material Condition ◽  
Ship Maintenance ◽  
Equipment Testing ◽  
Vessel Material ◽  
Critical Components

Commercial operators today are required to maintain maximum vessels in-service levels and, with government vessel operators competing for decreasing operating funds, the management of ship maintenance and repair (M&R) has become a highly visible area which can have a significant impact on overall vessel operating costs. As an approach to consolidate, improve, and simply better manage a vessel's state of material condition and M&R requirements, an integrated shipboard Material Condition Assessment Program can be implemented which provides a comprehensive evaluation and assessment of the various critical components on a ship-specific basis. This approach will integrate all vessel material condition assessment techniques and periodic surveys whose results can be used for advanced maintenance planning and budgeting. The approach and methodology employed and described in this paper are not new, having been tried and proven to varying degrees in the marine and related industrial fields, and are considered within the constraints of day-to-day vessel operation and maintenance management.

scholarly journals Condition Assessment Framework for Facility Management Based on Fuzzy Sets Theory

Buildings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 156
Author(s):  
Deniz Besiktepe ◽  
Mehmet E. Ozbek ◽  
Rebecca A. Atadero
Keyword(s):  
Fuzzy Sets ◽  
Condition Index ◽  
Condition Assessment ◽  
Facility Management ◽  
Maintenance Management ◽  
Fuzzy Sets Theory ◽  
Mean Time Between Failures ◽  
Condition Rating ◽  
Computerized Maintenance Management System ◽  
Sets Theory

Condition information is essential to develop effective facility management (FM) strategies. Visual inspections and walk-through surveys are common practices of condition assessment (CA), generally resulting in qualitative and subjective outcomes such as “poor”, “good”, etc. Furthermore, limited resources of the FM process demand that CA practices be efficient. Given these, the purpose of this study is to develop a resource efficient quantitative CA framework that can be less subjective in establishing a condition rating. The condition variables of the study—mean time between failures, age-based obsolescence, facility condition index, occupant feedback, and preventive maintenance cycle—are identified through different sources, such as a computerized maintenance management system, expert opinions, occupants, and industry standards. These variables provide proxy measures for determining the condition of equipment with the implementation example for heating, ventilating, and air conditioning equipment. Fuzzy sets theory is utilized to obtain a quantitative condition rating while minimizing subjectivity, as fuzzy sets theory deals with imprecise, uncertain, and ambiguous judgments with membership relations. The proposed CA framework does not require additional resources, and the obtained condition rating value supports decision-making for building maintenance management and strategic planning in FM, with a comprehensive and less subjective understanding of condition.

A New Integrated Design and Fabrication Process for Profiled Edge Laminae (PEL) Tooling

2005 ◽  
Author(s):  
Daniel F. Walczyk ◽  
Seungryeol Yoo
Keyword(s):  
Large Scale ◽  
Integrated Design ◽  
Thick Layer ◽  
Integrated Approach ◽  
Cnc Machining ◽  
Abrasive Waterjet ◽  
Surface Finishing ◽  
Small Scale ◽  
Extensive Surface ◽  
Critical Components

Profiled Edge Laminae (PEL) tooling is a thick-layer Rapid Tooling (RT) method that was developed a decade ago. Even with demonstrable advantages for large-scale tool applications over conventional CNC-machining of a solid billet and other commercially available RT methods, PEL tooling has not seen widespread use by industry because prior research related to laminated tooling has (1) focused on small-scale tools and perpendicular laser-cutting that required extensive surface finishing, and (2) there is no integrated and practical design and fabrication approach to tooling development. This paper describes a more streamlined and integrated approach to PEL tooling development, called the PEL Process, that builds upon prior work in this area. Critical components of the process that are described in detail include how to obtain lamina slicing information directly from a CAD model of the intended tool surface, how to measure dimensional errors between the PEL and CAD tool surfaces, and improved Abrasive Waterjet cutting trajectory and laminae slicing algorithms. The PEL Process is then demonstrated for the design and fabrication of aluminum PEL tooling used for hydroforming aircraft sheet metal components.

Mathematical modeling and optimization of tribological behaviour of Al 7075 based hybrid nanocomposites

2020 ◽  
pp. 135065012096578
Author(s):  
C Kannan ◽  
R Ramanujam ◽  
ASS Balan
Keyword(s):  
Integrated Approach ◽  
Industrial Applications ◽  
Heat Treatments ◽  
Operating Conditions ◽  
Hybrid Nanocomposites ◽  
Unreinforced Alloy ◽  
Optimum Level ◽  
Hybrid Nanocomposite ◽  
Tribological Behaviour ◽  
Material Condition

Many industrial applications necessitate lightweight materials that possess better tribological behaviour. Whilst aluminium based nanocomposites are proposed owing to their lightness, their tribological characteristics must be improved which are dominantly influenced by the selection of reinforcements, manufacturing process and heat treatments. In this research, an aluminium hybrid nanocomposite is produced using a novel molten salt processing and subjected to different heat treatments. Their tribological behaviour is assessed under different operating conditions viz. load, sliding velocity and material condition of the pin. Regression models are formulated to predict the tribological behaviour of developed hybrid composite under different heat treatments. The most significant parameter and optimum level for each of these operating parameters are determined using analysis of variance, main and interaction plots and response surface methodology in the end. The integrated approach helps in deciding the optimum parameter setting for the development of nanocomposite with ameliorated tribological behaviour. Under the optimized conditions, the hybrid nanocomposite could able to reduce the wear resistance by about 63% and the coefficient of friction by 18.5% than unreinforced alloy.

Evaluation on Public Bicycle Traffic System

2013 ◽  
Vol 694-697 ◽  
pp. 3310-3313
Author(s):  
Tian Jun Feng ◽  
Chun Yan Liang ◽  
Li Xin Wu
Keyword(s):  
Motor Vehicle ◽  
Comprehensive Evaluation ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Service Levels ◽  
The Public ◽  
Traffic System ◽  
Index Value ◽  
Function Models ◽  
Absolute Advantage

First, the public bicycle traffic evaluation index system is established by six indicators measured, including system characteristics, environmental pollution and service levels. Further, the function models are established. Last, comparing comprehensive evaluation index value of bicycle, bus and motor vehicle three traffic kinds of transportation by a case, the result shows that public bicycle traffic has an absolute advantage among them within 3 kilometers.

Development Solution of Civil Helicopter Transmission Train Vibration Monitoring System

2011 ◽  
Vol 86 ◽  
pp. 342-347
Author(s):  
Su Ning Zhang ◽  
Wen Qiang Ding ◽  
Yong Hong Wang
Keyword(s):  
Monitoring System ◽  
External Environment ◽  
Considerable Improvement ◽  
Maintenance Management ◽  
Vibration Monitoring ◽  
Equipment Failures ◽  
System Vibration ◽  
Critical Components ◽  
Helicopter Transmission ◽  
Train Vibration

Health & Usage Monitoring System (HUMS) is designed for improving airworthiness, reliability and effective maintenance management of helicopter by analysis of detected / diagnosed operation data internal/external environment data collected from the helicopter. Vibration monitoring system plays as an important part of entireness integrated HUMS, which offers a considerable improvement to conventional monitoring techniques. This paper covers development solution of civil helicopter transmission train Vibration monitoring system. Vibration monitoring system (VMS) constantly checks the performance of safety-critical components, provides warnings in advance of potential equipment failures and collects valuable data for routine maintenance of the helicopters.

scholarly journals Use of rating methodology for evaluation of the financial condition of the enterprise

2020 ◽  
pp. 13-16
Author(s):  
Anna CHERNIAIEVA ◽  
Anastasiia KONDRATENKO
Keyword(s):  
Financial Management ◽  
Financial Stability ◽  
Financial Analysis ◽  
Comprehensive Evaluation ◽  
Balance Sheet ◽  
Integrated Approach ◽  
Assessment Method ◽  
Necessary Condition ◽  
Economic Activities ◽  
Financial Condition

Introduction. A necessary condition for effective corporate finance management, rational use of enterprise resources is a reliable and comprehensive evaluation of the financial condition of the enterprise. In the modern practice of financial management, the problem of qualitative and quantitative justification of management financial decisions is solved through the widespread use of information about the financial condition of enterprises, which are the main subjects of economic relations. The purpose of the paper is to research of essence and features of use of a rating evaluation of a financial condition of the Ukrainian enterprises in modern economic conditions Results. There are many methods for evaluation the financial condition of an enterprise: balance methods, express analysis, efficiency analysis, bankruptcy evaluation, rating evaluation, integrated evaluation. The choice of method of conducting a comprehensive evaluation of the financial condition of the enterprise depends on a number of factors: type of economic system, the degree of development of market relations, the peculiarities of the balance sheet and other forms of reporting, industry characteristics, type of activity, form of ownership of the enterprise, etc. We recommend the rating evaluation of the financial condition of the enterprise. The methodology of rating evaluation of the financial condition of the enterprise is based on an integrated approach; indicators of profitability, liquidity, financial independence and financial stability of the enterprise, and also data on efficiency of use of financial resources and production potential of the enterprise are used at its construction. Calculations of indicators of the financial condition of the enterprise according to the rating assessment method were carried out on the basis of the data of the company's public financial statements for the period 2017–2019. According to the results of calculations, the enterprise received a score of 0.615 points, which corresponds to the AA rating. Conclusion. The use of rating assessment of the financial condition of the enterprise is an effective tool of financial analysis, which allows to obtain a final evaluation of the financial and economic activities of the investigated enterprise.

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