The Multilevel Prognosis System Based on Matrices and Digraphs Methods

2013 ◽  
Vol 199 ◽  
pp. 79-84 ◽  
Author(s):  
Mariusz Piotr Hetmańczyk

The author of this article considers new approach based on operational reliability models, written in the form of matrices and digraphs methods. At a core of the method the author used the theory of systems and their decomposition consistent with the FMEA methodology [, that allows a simplification of the distribution of elements within the system into smaller parts having a greater susceptibility to the error analysis and forecasting of their states. The method mainly refers to decentralized systems, linked via reciprocal relationships (that can be applied to manufacturing work centres, transport lines, etc.), containing subsystems that use the control, power, noise and mass flows streams. Article includes also main assumptions of described method, realizability studies, application areas and significant restrictions.

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.


2012 ◽  
Vol 195-196 ◽  
pp. 829-833
Author(s):  
Jin Wei Yu

In this paper, a new kind of presentation model for software modeling and transformation is proposed, which is composed of three parts: static model, action model and presentation model. Presentation model describes user interface appearance thorough, while interface template describes the macro-layout and relation of interface, whose basic element is interactive object. Interface template-based presentation model can enhance the rationality of macro-layout of the interface, enhance the expressive power and control power, meet the requirement of auto generate high quality user interface. This solution can be used widely for suffering little from the domain and some special techniques of target applications.


2012 ◽  
Vol 16 (suppl. 2) ◽  
pp. 399-407 ◽  
Author(s):  
Vojin Grkovic ◽  
Dragoljub Zivkovic ◽  
Milana Gutesa

This paper presents a new approach in mathematical modeling of thermodynamic cycles and electric power of utility district-heating and cogeneration steam turbines. The approach is based on the application of the dimensionless mass flows, which describe the thermodynamic cycle of a combined heat and power steam turbine. The mass flows are calculated relative to the mass flow to low pressure turbine. The procedure introduces the extraction mass flow load parameter ?h which clearly indicates the energy transformation process, as well as the cogeneration turbine design features, but also its fitness for the electrical energy system requirements. The presented approach allows fast computations, as well as direct calculation of the selected energy efficiency indicators. The approach is exemplified with the calculation results of the district heat power to electric power ratio, as well as the cycle efficiency, versus ?h. The influence of ?h on the conformity of a combined heat and power turbine to the grid requirements is also analyzed and discussed.


2012 ◽  
Vol 424-425 ◽  
pp. 665-668
Author(s):  
Wei Shao ◽  
Deng Xin Hua

Metal parts with large and complicated curved surfaces used widely have some characteristics such as a great volume, a big area, distorting easily. It is very difficult to measure and evaluate accurately the parts. Taking measurement of the parts as a purpose, a new measurement method called On-Line Shape Measurement System (OSMS) is put forward.Error analysis of curves is a requirement to assure quality and to reduce manufacturing costs and rework. This paper proposes a new approach and algorithms for the error analysis of curves.the system applies a robust mathematic model, Implicit polynomials (IP), to construct the model of the test-points. Once the CAD model is adjusted, it is compared with input to reveal the errors between their shapes. To accomplish this task a new shape matching algorithm is developed. Experimental results on error analysis of a variety of the machined metal skin of aircraft are reported to show the validity of the proposed methodology.


Author(s):  
Н.А. Сидоренков ◽  
Б.Г. Мартынов

Во время эксплуатации гидроманипуляторов (ГМ) возникает задача продления жизненного цикла ГМ. В настоящее время он составляет при полной нагрузке ГМ от 3 до 5 лет или 6000 моточасов до капитального ремонта. В зависимости от условий работы и обслуживания этот ресурс, по данным ПО «Подъемные машины», может быть израсходован за 8 мес. Руководством по эксплуатации ГМ определены пять видов ТО: ЕТО и четыре номерных. Причем в гарантийных обязательствах определен период работы ГМ до первого отказа. Он соответствует примерно 120 моточасам. Для продления срока службы ГМ до капитального ремонта необходимо перейти от обычной планово-предупредительной системы ТО и ремонта к проактивной системе. Основу проактивной системы ТО и Р составляет правильное управление техническим состоянием механизма с целью повышения его эксплуатационной надежности, определения оптимальной периодичности ТО и Р, что в свою очередь требует полной информации о техническом состоянии механизма и надежности его узлов и сопряжений. Цель проактивной системы ТО и Р – предупреждать отказ узлов и сопряжений механизма. Для реализации этой цели необходима разработка модели надежности ГМ и проведение статистических исследований отказов элементов механизма. Поэтому данная задача является актуальной. В настоящей статье приводится выражение, которое позволит формировать стратегию обслуживания данного типа манипуляторов для продления их срока службы. Цель исследования – разработка вероятностной модели надежности узлов и сопряжений ГМ для решения одной из задач управления техническим состоянием механизма с целью обоснования проактивной системы ТО и Р. During operation of hydraulic manipulators (GM), there arises the problem of extending the life cycle of the GM. Currently, it is under full load UM from 3 to 5 years or 6000 hours before overhaul. Depending on the conditions of operation and maintenance of this resource, according to «Lifting machines», can be used for 8 months. The user manual for the GM identifies five kinds: UTB and four plates. And in a warranty period defined by the work of the GM until the first failure. It corresponds to about 120 hours. To extend the service life of the GM overhaul need to move from conventional preventive system of maintenance and repair to a proactive system. The basis for proactive maintenance and R is the correct management of the technical condition of the mechanism with the purpose of increasing its ex-operational reliability, determining the optimal frequency and R, which in turn requires full information about the technical condition of the mechanism and reliability of its components and interfaces. The purpose of proactive maintenance and repair – to prevent failure of the nodes and interfaces of the mechanism. To achieve this goal it is necessary to develop reliability models of the GM and carrying out statistical studies of failures of elements of the mechanism. Therefore, this task is urgent. In this paper, we provide an expression that will form the servicing strategy for this type of manipulators to extend their service life. The purpose of the study: the development of probabilistic reliability models of the nodes and interfaces of GM to address one of the problems of control of technical condition of the mechanism in order to justify the proactive maintenance and R.


2006 ◽  
Vol 20 (19) ◽  
pp. 1153-1161
Author(s):  
SHAN-LING HAN ◽  
ZHONG-QIN LIN ◽  
PING ZHU ◽  
XIN-MIN LAI

The lattice Boltzmann method, which can simulate the macroscopic behavior of fluid flow, is a relatively new approach. The error analysis of the lattice Boltzmann BGK model is proposed based on extrapolation technique. According to the Filippova procedure, the error estimation formula is derived. The theory analysis shows that the error of lattice Boltzmann method is proportional to the lattice size and the relaxation parameter. The non-equilibrium part of the distribution function leads to the main error. Finally, the proposed error analysis method is validated by numerical simulation of the lid-driven flows in a square cavity. The numerical results agree well with the theory analysis results.


Author(s):  
Herman Fesenko ◽  
Ihor Kliushnikov

A drone-based system of monitoring of severe NPP accidents is described. A structure of a multi-fleet of drones, consisting of main drone fleets and a reserve drone fleet, is considered. A matrix of drone fleet reliability assessment attributes is presented. Various structures for systems of control stations for the multi-fleet of drones are suggested. Reliability models for the multi-fleet of drones with centralized (irredundant), centralized (redundant), decentralized, and partially decentralized systems of control stations are developed and analyzed.


Author(s):  
Varsha Daftardar-Gejji ◽  
Yogita Sukale ◽  
Sachin Bhalekar

AbstractA new method to solve non-linear fractional-order differential equations involving delay has been presented. Applications to a variety of problems demonstrate that the proposed method is more accurate and time efficient compared to existing methods. A detailed error analysis has also been given.


2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840014
Author(s):  
Ze-Yu Liu ◽  
Qing-Dong Cai

This work clarifies the concept of cell average by pointing out the differences between cell average and cell centroid value, which are averaged cell-centered value and pointwise cell-centered value, respectively. Interpolation based on cell averages is constructed and high order QUICK-like numerical scheme is designed for such interpolation. A new approach of error analysis is introduced in this work, which is similar to Taylor’s expansion.


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