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Analiza pracy komina o eksperymentalnej konstrukcji w zmiennych warunkach przepływu spalin

Konderla P., Patralski K.

Materiały Budowlane

2018

nr 4

61--63

Przedmiotem badań był żelbetowy komin o nietypowej konstrukcji, którego koronę zamyka żelbetowa płyta z centralnym konfuzorem kołowym oraz pięcioma kołowymi otworami rozmieszczonymi regularnie w układzie obwodowym. Otwory mają klapy, które są zamykane bądź otwierane w zależności od ilości spalin wprowadzanych do komina. Celem badań była ocena zastosowanego rozwiązania, biorąc pod uwagę możliwości eksploatacyjne, jakie daje konstrukcja oraz jej trwałość. Podstawą oceny pracy komina był termodynamiczny opis przepływu spalin przez komin w przypadku różnych możliwych warunków wyjściowych. Wyznaczono przede wszystkim linię prądu oraz rozkład prędkości i temperatury spalin w obszarze komina i na wylocie. Wykazano z jednej strony możliwość elastycznego sterowania pracą komina, a z drugiej wskazano na określone wady konstrukcyjne, które wpływają na destrukcję głowicy komina.

The subject of the research was a reinforced concrete chimney with an unusual structure, the crown of which is closed by a reinforced concrete plate with a central circular confusor and five circular openings arranged regularly in the perimeter system on the slab. The openings have flaps that are closed or opened depending on the amount of flue entering the chimney. The aim of the research was to evaluate the applied solution taking into account the operational possibilities given by the construction and durability of the structure. The basis for the assessment of the chimney work was the thermodynamic description of the flue gas flow through the chimney for various possible output conditions. In particular the power lines, velocity distributions and flue gas temperature in the chimney area and on the outlet were determined. On the one hand, the possibility of flexible control of the chimney work was demonstrated, on the other hand, certain constructional defects that affect the destruction of the chimney head were pointed out.

The optimal design of micro-punching die by using abductive and SA methods

Lin J.-Ch., Lee K.-S., Lin W.-S.

Archives of Computational Materials Science and Surface Engineering

2009

Vol. 1, nr 2

92-99

Purpose: Punching process currently plays an important role in industrial mass production. The current study focuses on increasing accuracy, performance and extending service life of punches and dies. Optimizing the design of the punch and die has been a common topic for scholars. Design/methodology/approach: The input parameters (punching times, clearance) and output results (wear) were used to construct a training database. The abductive network formulation established a relationship between input parameters and output results. By using the abductive modeling technique, the complicated and uncertain relationships between the input and output variables can be formulated into a useful mathematical model. Once the abductive network model was constructed, the relationships between input and output parameters variables became available. A simulated annealing algorithm (SA) with a performance index was established to optimize this process and find the best result as compared with the actual experiment values. Findings: This study aims to establish the relationship between punching times, clearance and wear of micro punches using the abductive network, and to find relational model involving input parameters and output result of punching die in composite blanking processes. This model can be used to estimate wear between punch and die for industrial applications. Research limitations/implications: Setting up the relational expression of punching times, clearance and wear requires a well-established database covering sufficient relevant parameters and data. In training the database, it is helpful to establish a good relational model among punching parameters. Incorrect data will cause abnormal wear. As a result, the mathematics model is difficult to converge and the neural network will inaccurately predict wear. In addition, the punching die may be changed prematurely, which increases production costs. Delay in replacing a worn punching die can result in poor quality of products. Originality/value: As electronic production becomes increasingly smaller, the opportunity to use micro punches and dies will expand accordingly. This study established the relational expression of input and output, which can be used to correctly estimate any wear condition. This result is based on an abductive network and SA method.