Sensor Selection Framework for Designing Fault Diagnostics System

In a world of rapidly changing technologies, reliance on complex engineered systems has become substantial. Interactions associated with such systems as well as associated manufacturing processes also continue to evolve and grow in complexity. Consider how the complexity of manufacturing processes makes engineered systems vulnerable to cascading and escalating failures; truly a highly complex and evolving system of systems. Maintaining quality and reliability requires considerations during product development, manufacturing processes, and more. Monitoring the health of the complex system while in operation/use is imperative. These considerations have compelled designers to explore fault-mechanism models and to develop corresponding countermeasures. Increasingly, there has been a reliance on embedded sensors to aid in prognosticating failures, to reduce downtime, during manufacture and system operation. However, the accuracy of estimating the remaining useful life of the system is highly dependent on the quality of the data obtained. This can be enhanced by increasing the number of sensors used, according to information theory. However, adding sensors increases total costs with the cost of the sensors and the costs associated with information-gathering procedures. Determining the optimal number of sensors, associated operating and data acquisition costs, and sensor-configuration are nontrivial. It is also imperative to avoid redundant information due to the presence of additional sensors and the efficient display of information to the decision-maker. Therefore, it is necessary to select a subset of sensors that not only reduce the cost but are also informative. While progress has been made in the sensor selection process, it is limited to either the type of the sensor, number of sensors or both. Such approaches do not address specifications of the required sensors which are integral to the sensor selection process. This paper addresses these shortcomings through a new method, OFCCaTS, to avoid the increased cost associated with health monitoring and to improve its accuracy. The proposed method utilizes a scalable multi-objective framework for sensor selection to maximize fault detection rate while minimizing the total cost of sensors. A wind turbine gearbox is considered to demonstrate the efficacy of the proposed framework.

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Partitioning Tasks to Product Development Teams

Volume 4: 14th International Conference on Design Theory and Methodology, Integrated Systems Design, and Engineering Design and Culture ◽

10.1115/detc2002/dtm-34031 ◽

2002 ◽

Cited By ~ 14

Author(s):

Dan Braha

Keyword(s):

Product Development ◽

Mathematical Formulation ◽

Solution Procedure ◽

Solution Technique ◽

Design Teams ◽

Complex Engineered Systems ◽

Development Teams ◽

Engineered Systems ◽

The Cost ◽

Product Development Teams

The principle of partitioning tasks among product development teams so as to minimize the cost of interactions across design teams is an important characteristic of complex engineered systems. Although there is growing literature that deals with the proper organization of product development tasks, little attention is given to rigorous modeling of the phenomena. To fill the void, we present a mathematical formulation for the problem. Two main issues are addressed by the model: 1) how to specify task dependencies, and 2) how to optimally partition the tasks among a number of teams. Characteristics of the problem are analyzed, and an efficient solution procedure is proposed. The developed model and solution technique can be applied to various scales of the product design and development process, and may open a variety of interesting questions.

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THEORETICAL PRINCIPLES OF FORECASTING THE COST OF A SOFTWARE PRODUCT

International scientific journal Internauka Series Economical Sciences ◽

10.25313/2520-2294-2020-11-6579 ◽

2017 ◽

Author(s):

Pavlo Rodionov ◽

◽

Anna Ploskonos ◽

Lesya Gavrutenko ◽

◽

...

Keyword(s):

Selection Process ◽

Individual Characteristics ◽

Successful Implementation ◽

Software Products ◽

Software Product ◽

Continue Research ◽

Cocomo Model ◽

Factors Of Influence ◽

The Individual ◽

The Cost

The paper analyzes the factors that affect the amount of effort required to create a mobile application and its cost. It is established that the main factors of influence are the design of the application, its functionality, the type of mobile platform, the availability and level of testing and support, as well as the individual characteristics of the developer. Based on the analysis of information sources, the main methods and approaches to forecasting the cost of software products are identified, which include the COCOMO model, Price-to-win method, expert evaluation, algorithmic methods and the method of analogies. It is proposed to consider the method of analogies as a tool that allows you to make predictions about the cost of resources required for the successful implementation of IT projects based on the experience of similar projects. It is proved that the advantages of this method are the simplicity of its implementation and the clarity of the results obtained, which follows from the practical orientation of this tool. Among the limitations of the method of analogy is the mandatory need for reliable data relating to similar projects, as well as the difficulty of taking into account unspecified indicators. Taking into account the mentioned limitations of the method of analogies and on the basis of the analysis of scientific sources the possible directions of its optimization are determined. Thus, among the ways to improve the effectiveness of this method are those aimed at optimizing the project selection process, the data for which are used as a basis for forecasting. Attempts to improve the method of analogies by including parameters that were previously ignored by this technique seem promising. This in turn can lead to an expansion of the scope of the method of analogies and increase the accuracy of forecasts. As prospects for further research, the need to continue research in the field of optimization of the method of analogies with the subsequent practical verification of theoretical positions on the data of real projects.

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ESTIMATION OF THE EFFICIENCY OF THE LUBRICATION OF THE WORKING SURFACES OF THE SADDLE-COUPLING DEVICE OF THE FOREST TRUCK

10.34220/mmeitsic2021_119-123 ◽

2021 ◽

Author(s):

Valeriy Posmetev ◽

Vadim Nikonov ◽

Viktor Posmetev

Keyword(s):

Computer Experiments ◽

Base Plate ◽

Optimal Number ◽

Actual Problem ◽

Premature Failure ◽

Coupling Device ◽

Excessive Consumption ◽

Operational Factors ◽

Friction Surfaces ◽

The Cost

The importance of the need for further constructive improvement of fifth-wheel couplings of timber tractors with semi-trailers has been substantiated. The main operational factors arising during the movement of a timber tractor with a semitrailer in the process of hauling timber and affecting the premature failure of the main parts of the fifth wheel coupling are considered. The influence on the resource of the fifth wheel coupling device of strict fulfillment of the mandatory operations of periodic lubrication of the saddle and the base plate of the semitrailer in the process of connecting and disconnecting it with a timber tractor is given. Described is the actual problem associated with excessive consumption of lubricant in the process of applying it to the friction surfaces of the saddle and the base plate of the semitrailer by the traditional method of extrusion. A possible method of dosed supply of the required volume of lubricant through the optimal number of lubrication holes to the friction surfaces is considered, which makes it possible to significantly reduce the cost of maintaining the operable state of the fifth wheel coupling. In order to preliminary evaluate the application of this lubrication method, which ensures the effective functioning of the fifth wheel coupling of a timber tractor with a semitrailer, several series of computer experiments were performed to determine the optimal number of lubrication holes in the saddle that evenly and dosed distribute the lubricant between the saddle and the base plate of the semitrailer.

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Tribology and Maintenance of Machinery – A Review

Indian Journal of Production and Thermal Engineering - regular ◽

10.54105/ijpte.b2010.061221 ◽

2021 ◽

pp. 16-20

Author(s):

Chandan Chattoraj ◽

Keyword(s):

Remaining Useful Life ◽

Condition Based Maintenance ◽

Maintenance Strategies ◽

Cost Benefits ◽

Maintenance Practice ◽

Useful Life ◽

The Cost

The present paper considers the tribological principles on the maintenance of machinery whose three important areas are – Preventive, Condition Based and Proactive. Although breakdown is kept out of view, the morphology and analysis of failure provide important inputs for maintenance strategies. Condition based maintenance depends on three D’s – Detection, Diagnosis and Decision. In many machinery systems, the problem of predicting the remaining useful life – the Proactive part of the program, and evaluating the cost benefits are of enormous importance. Here the authors endeavor to highlight how the tribologist can significantly improve the maintenance practice.

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Forensic Engineering Use Of Fault Tree Analysis

Journal of the National Academy of Forensic Engineers ◽

10.51501/jotnafe.v23i2.662 ◽

2006 ◽

Vol 23 (2) ◽

Author(s):

Frank H. Johnson ◽

DeWitt William E.

Keyword(s):

Fault Tree ◽

Fault Tree Analysis ◽

Tree Analysis ◽

Complex Engineered Systems ◽

Track Record ◽

Forensic Engineering ◽

Fire And Explosion ◽

Engineered Systems ◽

Analytical Tools

Analytical Tools, Like Fault Tree Analysis, Have A Proven Track Record In The Aviation And Nuclear Industries. A Positive Tree Is Used To Insure That A Complex Engineered System Operates Correctly. A Negative Tree (Or Fault Tree) Is Used To Investigate Failures Of Complex Engineered Systems. Boeings Use Of Fault Tree Analysis To Investigate The Apollo Launch Pad Fire In 1967 Brought National Attention To The Technique. The 2002 Edition Of Nfpa 921, Guide For Fire And Explosion Investigations, Contains A New Chapter Entitled Failure Analysis And Analytical Tools. That Chapter Addresses Fault Tree Analysis With Respect To Fire And Explosion Investigation. This Paper Will Review The Fundamentals Of Fault Tree Analysis, List Recent Peer Reviewed Papers About The Forensic Engineering Use Of Fault Tree Analysis, Present A Relevant Forensic Engineering Case Study, And Conclude With The Results Of A Recent University Study On The Subject.

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3D Digital Manufacturing Applied on Drilling of 7050-T651 Aluminum Performed by Robot

Volume 2B: Advanced Manufacturing ◽

10.1115/imece2020-23507 ◽

2020 ◽

Author(s):

Bruno Zambrano Degan ◽

Gustavo Franco Barbosa ◽

David Guerra-Zubiaga ◽

Navid Nasajpour-Esfahani ◽

Abdullah Al Mamun

Keyword(s):

Process Simulation ◽

Aerospace Industry ◽

Virtual Manufacturing ◽

Machining Process ◽

Digital Manufacturing ◽

Manufacturing Processes ◽

Main Process ◽

The Cost ◽

Efficient Sequence

Abstract With advances in automation, industry seeks for optimization while new products are developed and manufacturing processes are becoming smarter. In this sense, virtual manufacturing validations have been demanded for reducing the cost with physical prototypes, ensuring ergonomically safe processes and increasing the quality of processes by emulating it realistically, levering automation utilization in industry environments with a faster and safer manner. By that, this research proposes the use of Tecnomatix Siemens® PLM software for process simulation of 7050 aluminum drilling, material which is widely used in aerospace industry, allowing the evaluation of complexes scenarios with multi-robot integration and its conditions and variables, in order to improve the machining process and its aeronautical structural assemblies. Thus, this research provided a relevant contribution regarding the analysis of main process parameters to obtain an efficient sequence of drilling, its productivity and ergonomic conditions.

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Systematic Process Selection in Mechanical Design

Volume 1: Design for Manufacturing Conference ◽

10.1115/96-detc/dfm-1403 ◽

1996 ◽

Author(s):

Amal M. K. Esawi ◽

Michael F. Ashby

Keyword(s):

Manufacturing Process ◽

Mechanical Design ◽

Selection Procedure ◽

Manufacturing Processes ◽

Process Selection ◽

Systematic Selection ◽

Cost Penalty ◽

The Right ◽

The Cost ◽

Manufacturing Process Selection

Abstract There has been a recent awareness of the importance of making the right manufacturing decisions early in the design process before the cost penalty of making changes becomes too high. The selection of the most appropriate manufacturing process — of which there are a very large number — is one such decision. It is commonly based on human-resident experience or on established local practice. As such, some potentially-usable processes may be overlooked. This paper explores ways in which process selection might be made more systematic. It presents a procedure for manufacturing process selection which considers all manufacturing processes and eliminates the ones which cannot satisfy the design requirements. This is achieved using Process Selection Charts in which process capabilities are displayed graphically. A procedure for the ranking of the successful processes based on cost is under development. The systematic selection procedure lends itself well to computer implementation. A database of manufacturing processes and an advanced user interface thus provide ideal support for designers. Cambridge Materials Selector (CMS) software is currently being applied to manufacturing process selection.

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Representation of Burr Information in CAD Models

Volume 2: 19th Computers and Information in Engineering Conference ◽

10.1115/detc99/eim-9020 ◽

1999 ◽

Author(s):

Uma Jayaram ◽

David Cramer ◽

Narayanan Mathrubutham

Keyword(s):

Manufacturing Processes ◽

Cad Model ◽

Size Information ◽

Cad Models ◽

Master Model ◽

Physical Part ◽

The Cost ◽

Program Interface

Abstract Burr removal and deburring can often account for as much as one-third the cost of producing a part. Much attention is being focussed on integrating the deburring process into the product and manufacturing processes. Consequently there is a need for a system which can represent burr information in the CAD model as part of the product “master” model. In this paper, we present a method to capture burr information from the physical part and integrate that information with the CAD model of the part. Burr location and size information were recorded for the physical part. Methods were developed to encapsulate this information automatically in the CAD model through the applications program interface. This information was used to automatically create NC operations and sequences for downstream deburring.

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A Novel Blind Wavelet Base Watermarking of ECG Signals on Medical Images Using EZW Algorithm

Encyclopedia of Healthcare Information Systems ◽

10.4018/978-1-59904-889-5.ch125 ◽

2008 ◽

pp. 1004-1015

Author(s):

Mohammad Saleh Nambakhsh ◽

M. Shiva

Keyword(s):

Medical Images ◽

Wavelet Coefficients ◽

Ecg Signals ◽

Multimedia Contents ◽

Cost Of Health Care ◽

Ezw Algorithm ◽

Diagnostics System ◽

The Cost ◽

Efficient Memory ◽

And Storage

Exchange of databases between hospitals needs efficient and reliable transmission and storage techniques to cut down the cost of health care. This exchange involves a large amount of vital patient information such as biosignals and medical images. Interleaving one form of data such as 1-D signal over digital images can combine the advantages of data security with efficient memory utilization (Norris, Englehart & Lovely, 2001), but nothing prevents the user from manipulating or copying the decrypted data for illegal uses. Embedding vital information of patients inside their scan images will help physicians make a better diagnosis of a disease. In order to solve these issues, watermark algorithms have been proposed as a way to complement the encryption processes and provide some tools to track the retransmission and manipulation of multimedia contents (Barni, Podilchuk, Bartolini & Delp, 2001; Vallabha, 2003). A watermarking system is based on an imperceptible insertion of a watermark (a signal) in an image. This technique is adapted here for interleaving graphical ECG signals within medical images to reduce storage and transmission overheads as well as helping for computer-aided diagnostics system. In this chapter, we present a new wavelet-based watermarking method combined with the EZW coder. The principle is to replace significant wavelet coefficients of ECG signals by the corresponding significant wavelet coefficients belonging to the host image, which is much bigger in size than the mark signal. This chapter presents a brief introduction to watermarking and the EZW coder that acts as a platform for our watermarking algorithm.

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