scholarly journals The New Approach to Identification of Parametric and Momentary Damages on the Basis of Lindeberg – Levy’s Model

2017 ◽  
Vol 43 (1) ◽  
pp. 5-21
Author(s):  
Paweł Lindstedt ◽  
Tomasz Sudakowski ◽  
Artur Kułaszka
Keyword(s):  
Standard Deviation ◽  
Threshold Value ◽  
Technical Condition ◽  
Technical Object ◽  
New Approach ◽  
Reliability Parameters ◽  
Condition Equation ◽  
Lévy’S Theorem ◽  
The Moment ◽  
Damage Map

Abstract The new approach for the assessment of reliability condition of the exploited system, based on the appropriate analysis of changes in the current parameters of technical condition aRb and the regulation condition aRc, determined from the compressed condition equation (1 and 2). While analyzing the course of momentary parameters for technical condition aRb and the regulation condition aRc, it was observed that the parametric and momentary damages can be identified on the basis of quantitative relations between momentary threshold value dpr and corresponding momentary permissible value dpr dop, which are calculated from equation (7, 8, 9) resulting from Lindeberg–Levy’s theorem. It is assumed that the damages are prevailing, when for the moment θi: >dpri> dpr dopi. With the number of damages (damage map), reliability parameters for each moment of exploitation of technical object (before the catastrophic damages will occur) can be determined. Parametric damages (expected lifetime E(T) and standard deviation of expected lifetime σE(T) provides the reasonable information for the appropriate planning of the servicing of exploitative objects.

Identification of Parametric and Momentary Damages on the Basis of Lindeberg-Levy’s Model

2017 ◽  
Vol 260 ◽  
pp. 249-257
Author(s):  
Paweł Lindstedt ◽  
Tomasz Sudakowski
Keyword(s):  
Standard Deviation ◽  
Threshold Value ◽  
Technical Condition ◽  
Technical Object ◽  
Reliability Parameters ◽  
Innovative Method ◽  
Condition Equation ◽  
Lévy’S Theorem ◽  
The Moment ◽  
Damage Map

Article presents the innovative method for the assessment of reliability condition of the exploited system, based on the appropriate analysis of changes in the current parameters of technical condition aRb and the regulation condition aRc, determined from the compressed condition equation (1 and 2). While analyzing the course of momentary parameters for technical condition aRb and the regulation condition aRc, it was observed that the parametric and momentary damages can be identified on the basis of quantitative relations between momentary threshold value dpr and corresponding momentary permissible value dprdop, which are calculated from equation (7, 8, 9) resulting from Lindeberg-Levy’s theorem. It is assumed that the damages are prevailing, when for the moment θi: dpri>dpr dopi. With the number of damages (damage map), reliability parameters for each moment of exploitation of technical object (before the catastrophic damages will occur) can be determined. Parametric damages (expected lifetime E(T) and standard deviation of expected lifetime σE(T) provides the reasonable information for the appropriate planning of the servicing of exploitative objects.

scholarly journals Parametric evaluation of the technical object suitability based on analyze the quality of its maintenance and use taking into account the initial conditions

2018 ◽  
Vol 182 ◽  
pp. 01006
Author(s):  
Rafał Grądzki
Keyword(s):  
Equations Of State ◽  
Initial Conditions ◽  
Technical Condition ◽  
Operation Condition ◽  
Technical Object ◽  
Coupled Equations ◽  
Reliability Parameters ◽  
Operation Conditions ◽  
Operational Data

In this paper, the comparison of three various technical objects (engines of public transport buses) exploitation research for different initial conditions are presented. Object researches were carried out in 2012 and then repeated in 2013. Gathered operational data is presented in three sets (1 – concerning object, 2 – concerning driving conditions, 3 – concerning driver, where set 1 is the collection of diagnostic information Dk, and sets 2 and 3 are the information about object environment U) in form of conventional points (experts numerical assessments). Relation between point information of object and point information of environment was described by coupled equations of state (describing relations between operation condition and technical condition including initial conditions for each analyzed exploitation period). That method allows to determine parameters of technical condition aT and operation condition aR and next, from the course of aT parameter, set of parametrical damage mT(t) and from course of parameter aR – set of momentary damage aR(t). Thus it is possible to evaluate exploitation, technical and operation conditions of each object (bus engine). Received reliability parameters allows to properly control exploitation and service of particular objects and set of objects (fleet of buses) and its elements.

The Method of Complex Worthiness Assessment of an Engineering Object in the Process of its Use and Service

2008 ◽  
Vol 144 ◽  
pp. 45-52 ◽  
Author(s):  
Paweł Lindstedt
Keyword(s):  
Threshold Value ◽  
State Equation ◽  
Technical Condition ◽  
Complex Method ◽  
Technical Object ◽  
Common Information ◽  
Maintenance Practice ◽  
Condition Adjustment ◽  
Theoretical Foundations

A focus of the paper is concerned with the issue that optimal actions of regulation, diagnostics and reliability tests of technical objects are required from the maintenance staff involved in their use and servicing, and on the other hand, that they are performed independently and autonomously in the current maintenance practice instead of being accomplished in a strictly coordinated and complex way. It was noticed that only one and common information on the object exists and provides a solid basis for coordination of the regulation, diagnostics and reliability tests. This information can be applied many times for solving various problems no matter if they concern regulation, diagnostics or reliability. Next, this paper presents an original approach of conversion of the considered information into explicit time-and-space determined “number of threshold value overshoots” of signals related to the object and its environment as well as theoretical foundations (based on various configurations of the state equation) for conversion of the considered piece of information, expressed by the aforementioned “numbers”, into the parameters of the object ability condition (i.e., its technical condition, adjustment and reliability). The theses of the presented complex method for the assessment of technical object ability were subjected to long-term verification with positive result in the study of the Allison 250 engine bearing system.

Perceiving at a distance: enaction, exteriority and possibility – a tribute to John Stewart

2021 ◽  
pp. 105971232110310
Author(s):  
Charles Lenay
Keyword(s):  
Experimental Study ◽  
Perceptual Experience ◽  
Spatial Perception ◽  
Distant Object ◽  
New Approach ◽  
Second Stage ◽  
The Moment ◽  
Two Stages

The aim of this article is to offer a new approach of perception regarding the position of a distant object. It is also a tribute to John Stewart who accompanied the first stages of this research. Having already examined the difficulties surrounding questions of the perception of exteriority within the framework of enactive approaches, we will proceed in two stages. The first stage will consist of an attempt to explain distal perception in terms of individual sensorimotor invariants. This poses the problem but fails to solve it. The second stage will propose a new pathway to account for spatial perception; a pathway that does not deny the initial intuitions of the autopoietic enactive approaches, but one which radically changes the conception of cognition by considering, from the perceptual stage, the need to take into account interindividual interactions. The protocol of an original experimental study will characterize this new approach considering the perceptual experience of objects at a distance, in exteriority, in a space of possibilities without parting from the domain of interaction. To do this, we have to work at the limits of the perceptual crossing, that is, at the moment when the perceptual reciprocity between different subjects begins to disappear.

Probabilistic Optimal Design Using Successive Surrogate Probability Density Functions

1990 ◽  
Author(s):  
R. J. Eggert ◽  
R. W. Mayne
Keyword(s):  
Probability Density ◽  
Optimization Method ◽  
Probability Density Functions ◽  
Density Functions ◽  
Matching Method ◽  
Design Constraint ◽  
New Approach ◽  
Function Formulation ◽  
The Moment ◽  
Theoretical Considerations

Abstract Probabilistic optimization using the moment matching method and the simulation optimization method are discussed and compared to conventional deterministic optimization. A new approach based on successively approximating probability density functions, using recursive quadratic programming for the optimization process, is described. This approach incorporates the speed and robustness of analytical probability density functions and improves accuracy by considering simulation results. Theoretical considerations and an example problem illustrate the features of the approach. The paper closes with a discussion of an objective function formulation which includes the expected cost of design constraint failure.

Competitive Memory Training (COMET) for Low Self-Esteem in Patients with Personality Disorders: A Randomized Effectiveness Study

2010 ◽  
Vol 39 (1) ◽  
pp. 1-19 ◽  
Author(s):  
Kees Korrelboom ◽  
Marlies Marissen ◽  
Tanja van Assendelft
Keyword(s):  
Personality Disorders ◽  
Self Esteem ◽  
Borderline Personality ◽  
Effect Sizes ◽  
Memory Training ◽  
Therapeutic Effects ◽  
New Approach ◽  
The Moment ◽  
Mental Health Institution ◽  
Intermediate Effect

Background: Self-esteem is a major concern in the treatment of patients with personality disorders in general. In patients with borderline personality disorder, low self-esteem is associated with factors contributing to suicidal and self-injurious behaviour. At the moment there are no well-proven interventions that specifically target low self-esteem. Recently, a new approach, Competitive Memory Training or COMET, aimed at the enhancement of retrieving beneficial information from memory, appeared to be successful in addressing low self-esteem in different patient populations. Aims: To assess whether COMET for low self-esteem is also an effective intervention for patients with personality disorders. Method: 91 patients with personality disorders who were already in therapy in a regular mental health institution were randomly assigned to either 7 group sessions of COMET in addition to their regular therapy or to 7 weeks of ongoing regular therapy. These latter patients received COMET after their “7 weeks waiting period for COMET”. All patients that completed COMET were contacted 3 months later to assess whether the effects of COMET had remained stable. Results: Compared to the patients who received regular therapy only, patients in the COMET + regular therapy condition improved significantly and with large effect sizes on indices of self-esteem and depression. Significant differential improvements on measures of autonomy and social optimism were also in favour of COMET, but had small to intermediate effect sizes. The therapeutic effects of COMET remained stable after 3 months on three out of the four outcome measures. Conclusion: COMET for low self-esteem seems to be an efficacious trans-diagnostic approach that can rather easily be implemented in the treatment of patients with personality disorders.

scholarly journals Analysis of storm water systems and sanitary sewers: technical, organizational and economic aspects

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Viktoriia Vorobiyova ◽  
Galina Astratova
Keyword(s):  
Wastewater Treatment ◽  
Local Treatment ◽  
Technical Condition ◽  
Water Supply Systems ◽  
Economic Aspects ◽  
Highly Qualified ◽  
Qualified Personnel ◽  
Systems Identification ◽  
Treatment Facilities ◽  
The Moment

The analysis of systems of storm and household Sewerage on the basis of research of some technical, organizational and economic aspects of activity of systems is carried out. It is shown that at the moment the problem of wastewater treatment is extremely relevant. It is established that many companies discharge a large amount of waste water, which is not actually treated in local reservoirs. It is revealed that in the studied area in the Russian Federation as a whole and in the Sverdlovsk region, in particular, there is a failure to comply with the standards of treatment facilities. The key reasons for this situation are the following main factors: physical deterioration of the equipment, unsatisfactory technical condition of treatment facilities; mismatch of the composition of incoming wastewater and treatment systems; lack of wastewater treatment facilities; under-load on hydraulics and uneven flow of wastewater; violation of technical and technological modes of operation of treatment facilities; untimely carrying out of repair and restoration works, replacement of the failed equipment, units and parts; lack of sufficient financing of the industry, financing on the «residual principle»; lack of highly qualified personnel for the implementation of competent operation of treatment facilities; etc. The authors believe that in order to improve the quality of wastewater discharged, reduce their impact on water bodies, reduce the volume of wastewater emissions, the following priority measures are needed: construction of new, reconstruction and expansion of existing treatment facilities; construction of local treatment facilities, post-treatment units; commissioning of recycling and re-water supply systems; identification of additional sources of financing for the treatment facilities system, including through concession agreements, the creation of private-public partnerships; formation of «the state order» and allocation of target budgetary places in colleges and higher education institutions on training in the specialties connected with housing and communal services, water consumption and water disposal.

scholarly journals Advantage and practical use of solar panels in road construction

2019 ◽  
Vol 6 (2) ◽  
Author(s):  
Mikhail Permyakov ◽  
Alexander Ilyin ◽  
Tatyana Ivanchenko ◽  
Alexander Ivanchenko ◽  
Nikolai Kopeikin
Keyword(s):  
Negative Impact ◽  
Road Construction ◽  
Modern World ◽  
Solar Panels ◽  
New Approach ◽  
Power Stations ◽  
The Moment ◽  
Renewable Natural Resource ◽  
Current Energy ◽  
Intended Use

This article focuses on ordinary, familiar to us structures and what other benefits, except for their intended use, they can bring. One of the most pressing problems of the modern world is the excessive use of non-renewable or hardly renewable natural resources. The key element necessary for the operation of transport is gasoline extracted from oil, which is a hardly renewable natural resource, at the moment the rate of consumption of oil significantly exceeds the rate of its occurrence in the natural environment. In addition, people use atomic power stations to produce energy used in everyday life, many plants and factories are built to produce various things necessary for life, and sometimes just to increase comfort. All this has a very negative impact on the environment, and to clean it after such pollution is a very difficult task. In this way, in the use of current energy sources, we distinguish 2 significant flaws – the exhaustion and difficulty of renewal of the key components necessary for obtaining energy and the negative impact on the world around us. Many states came to the conclusion that it would be much more rational to develop a new approach to energy production, based on the use of inexhaustible and environmentally friendly natural elements. The main example of this approach is the use of solar energy by converting it into electricity using solar panels. In this article, we will look at solar panels and their use in road construction as a way to generate energy and solve environmental problems.

scholarly journals A New Approach for Evaluating Software Testing Automation Tools

2019 ◽  
pp. 67-73
Author(s):  
N. Induja ◽  
R. Maruthi
Keyword(s):  
Software Testing ◽  
Software Industry ◽  
Management Team ◽  
Automated Testing ◽  
End User ◽  
New Approach ◽  
Testing Tool ◽  
The Moment ◽  
Automation Tools ◽  
Selection Of

The environments where the build to focus the warehouse to maintain all the business aspects are satisfied and the quality are obtained on the functionalities are acting up to the users mark. The objective of this paper is to evaluate and initiate a mechanism to evaluate automation tools effectively, at the moment. There are various systems built and even if they are platform independent and also if existing with additional features they are having many demerits that don't satisfy the end user. An important contribution of this paper is the development of the metric suite that facilitates assessment and selection of a desired testing tool for automated testing and in relation to the environment for the software is developed. At the software industry it is a high value for project management team selecting the tools that may satisfy the requirement satisfactions highlighted by the end user to be satisfied to maintain the business mix.

A Simple Method for Estimating the Parameters of the Beta Distribution Applied to Modeling Uncertainty in Gas Turbine Inlet Temperature

2002 ◽  
Author(s):  
Frederic A. Holland
Keyword(s):  
Standard Deviation ◽  
Conventional Method ◽  
Beta Distribution ◽  
Conventional Approach ◽  
Algebraic Solution ◽  
Inlet Temperature ◽  
Shape Parameters ◽  
Simple Method ◽  
New Approach ◽  
A Value

The beta distribution is a particularly convenient model for random variables when only the minimum, maximum and most likely values are available. It is also very useful for estimating the mean and standard deviation given this information. In this paper a simple method is proposed to estimate the beta parameters from these three values. The proposed method has advantages over the conventional approach. In the conventional approach, the four parameters of the beta distribution are determined from only three values by assuming a standard deviation that is one-sixth the range. In contrast, the new method assumes a value for one of the beta shape parameters based on an analogy with the normal distribution. This new approach allows for a very simple algebraic solution of the beta shape parameters in contrast to the simultaneous solution required by the conventional method. The results of the proposed method are very similar to the conventional method. However, the proposed method generally gives a slightly higher (more conservative) estimate of the standard deviation when the distribution is skewed. In addition, the new approach allows the standard deviation to vary as the shape or skew of the distribution varies. Both methods were applied to modeling the probability distribution of temperature.

Sign in / Sign up

Export Citation Format

Share Document