Przeglądaj {{ collection }} wg Autor "Sabiniak, Henryk Grzegorz"

Teraz wyświetlane 1 - 4 z 4

Klimatyzacja obiektów basenowych
(Wydawnictwo Politechniki Łódzkiej, 2010) Sabiniak, Henryk Grzegorz; Pietras, Marek; Jeżowiecki, Janusz; Urbaniak, Maciej
(...) Książka zawiera zebrane i usystematyzowane informacje dotyczące klimatyzacji hal basenowych w aspekcie usuwania powstających w tego rodzaju obiektach dużych zysków wilgoci oraz wiadomości na temat sposobów zapewnienia komfortu osobom korzystającym z tego rodzaju obiektów. Zamieszczono w niej zależności matematyczne umożliwiające przeprowadzenie obliczeń projektowych wraz z wytycznymi wykonania dokumentacji technicznej klimatyzowanego obiektu basenowego. Zostały opisane zalecenia dotyczące odbioru tego rodzaju instalacji w obiektach basenowych oraz wytyczne do dalszej eksploatacji. Wzory, rozważania i analizy teoretyczne zostały poparte przykładem projektu instalacji klimatyzacyjnej rzeczywistego obiektu basenowego.(...) (...) W książce znalazły odzwierciedlenie zgromadzone informacje z literatury i przepisów prawnych dotyczące ośrodków basenowych wraz z ich analizą oraz doświadczenie wyniesione przez autorów z prac nad projektami instalacji klimatyzacyjnych różnych obiektów, w tym w szczególności hal basenowych, także z ich nadzorowania w wykonawstwie, jak i późniejszej eksploatacji. Autorzy zgromadzili cenne informacje, wykonując ekspertyzy nieprawidłowego działania tego typu instalacji klimatyzacyjnych, a także analizując przyczyny awarii, które miały miejsce. Tak uzyskaną wiedzę, popartą jeszcze doświadczeniem dydaktycznym w prowadzeniu przedmiotów z mechaniki płynów, termodynamiki, wentylacji, wentylacji przemysłowej i klimatyzacji, autorzy starali się zawrzeć w niniejszej książce. Celem autorów jest podzielenie się wiedzą i doświadczeniem z projektantami, wykonawcami i eksploatatorami klimatyzowanych obiektów basenowych. Książka kierowana jest przede wszystkim do projektantów i wykonawców instalacji klimatyzacyjnych w obiektach basenowych. Może ona także w pewnym zakresie służyć pracownikom nauki, jako kompendium wiedzy o klimatyzacji obiektów basenowych zawartej w jednym miejscu. Może być im także pomocna w procesie dydaktycznym, służąc jako podręcznik, a studentom w stawianiu pierwszych kroków w projektowaniu instalacji wentylacyjnych i klimatyzacyjnych, niekoniecznie obiektów basenowych. W takich przypadkach szczególnie pomocny może okazać się przykład projektowy ośrodka basenowego.
Metody modelowania i obliczania rozkładu obciążenia w zazębieniach ślimakowych
(Wydawnictwo Politechniki Łódzkiej, 2007) Sabiniak, Henryk Grzegorz; Red. nauk. Wydziału: Urban, Tadeusz; Szczerek, Marian; Trombski, Marek
Compactness, silent running and possibility of achieving large transmission ratio at one degree make worm gears one of the most popular reducer types. There exist actually two problems to be solved during designing and exploitation of cylindrical and globoid worm gears: the gliding speed and the distribution of load in teeth. Great gliding speeds in the teeth are a characteristic feature of worm gears. It is a disadvantage because it results in power losses. The losses, in tum, change into heat during the gear work. The problem is already known to worm gears designers. This negative effect may be reduced in various ways by proper selection of teeth outline geometry as well as materials choice and correction. Y et the distribution of load in the teeth of worm gears is unknown or almost unknown. The knowledge of distribution of load along the contact lines between the pairs of cooperating teeth and of the associated tension in the tooth root as well as of the proper physical laws will enable achieving through constructional operations at the designing stage of such a load distribution that will enable increasing the working life or load endurance and consequently increasing the efficiency of the gear. Due to their specificity, globoid teeth, including worm teeth, are an extremely difficult area for theoretical as well as for experimental research. The knowledge and information about this type of teeth should be looked for in basie engineering problems, like the theory of plates, the theory of friction, lubrication and wearing out or the theory of surface pressure. Obviously not whole the research run in these areas can be directly applied to globoid teeth. Only a small part of them can be applied in practice here. The basie theory used in the worm teeth modelling was the theory of plates, specifically the theory of circular and rectangular, thin and thick support plates with constant and variable thickness. The mathematical and physical models of these teeth were step by step adjusted to the engineering reality. In the research a number of problems in the area of the support plates theory were solved with special possibility to adjust them to the teeth of globoid and cylindrical worm gears. Particular problems of the plate theory were solved with the use of different methods: analytical, analytical-empirical, empirical. Obtaining the information on stress and deformations in the worm teeth was based on mathematical models, including the graphic ones projecting the real systems considerably well. In the experimental research the measuring methods and apparatus selection were presented enabling obtaining as accurate results as possible, which did not demand further recalculating of the measurements. Thus issues formulated in the above way were considered. The presented results and their processing enable calculating in a short time deformations of support plates under any load as well as finding the distribution of load (knowing the inter teeth stress) that caused these deformations. The knowledge of the distribution of load along the contact line of the pairs of cooperating teeth in any type of gears enables a detailed analysis of the gear work. Through proper correction or even modification of the outline of working surface of the worm teeth and work wheel the load cumulating and stress at the tooth root can be avoided, which in consequence improves the durability of the whole gear. The results achieved in the work can serve for making the further calculations of the plates themselves more precise as well as specifying the analysis of the real systems projected by the support plates, e.g. in other types of drives, machines themselves or mechanical constructions in which such models can be applied.
Obciążalność i trwałość przekładni ślimakowych
(Wydawnictwo Politechnika Łódzka, 2007) Sabiniak, Henryk Grzegorz; Red. nauk. Wydziału: Urban, Tadeusz; Pytko, Stanisław; Wróbel, Jerzy
Verification calculations are indispensable in the design process of any type of structure. Their aim is predominantly to determine whether the exploitation and load capacity limits have not been crossed in the designed structure. They are also applied in worm gears design. The results of verification calculations are the basis for determining the exploitation characteristics of a future gear. If in the design process more than one version of a worm gear has been designed, verification calculations enable carrying out elimination by resigning from the versions that do not meet the predetermined requirements. Basing on the analysis of verification calculations it is possible to decide about the choice of the finał version, the best one out of the versions developed in the design stage. In case of difficulty with taking any of the above mentioned decisions ( elimination or final choice) it is possible to return to -the stage of design calculations and draft of construction of the designed worm gear, being already equipped with the knowledge about where the "barriers" lie within the limits of the gear strain and where the safety "reserve" is excessive in its elements. Concurrent performance of two stages of design and verification calculations during gear design is widely practised and recommended, even for a single item, not mentioning a series or a type series of worm gears. Verification calculations also have other advantages. Having performed a number of experimental researches on real and model gears and having gained experiences in industry it is possible to differentiate empirical relationships, the basis for verification calculations, enabling evaluating explicitly the safety and strain of work of a given worm gear, which constitutes a good corrector of previously made calculations and drafts and of final construction solutions of worm gears based on them. The described method of joining together two stages: preliminary design works on worm gear and verification calculations is particularly effective and advantageous in toothed gears construction. It can be concluded from the above considerations that verification calculations are the finał stage of all mechanical structures design, as they confirm or deny the fact of meeting the predetermined strength and exploitation requirements by the installations. In case of worm gears design verification calculations are to determine if the following values have not been exceeded: mesh resistance to pitting, tooth root resistance to destruction, early abrasive wear of the working surface of teeth, temperature of the gear work, deflection of wormshaft. V erification calculations also include determining the finał efficiency of worm teeth mesh and of the whole gear as well as the degree of its self-locking. The paper provides numerous examples of such calculations.
Teoria i praktyka eksploatacji przekładni ślimakowych
(Wydawnictwo Politechniki Łódzkiej, 2006) Sabiniak, Henryk Grzegorz; Red. nauk. Wydziału: Urban, Tadeusz; Lawrowski, Zbigniew; Wilk, Andrzej
Worm gears are used for drive transrnission as reducers. They are practically not applicable as intensifiers. Worm gears are characterised by great compactness of structure, which is a consequence of the capability of achieving very large ratios, up to 70, at one degree. Still cases of greater speed reductions at one degree are also known. The gears can transrnit quite heavy loads, which results from the number of pairs of teeth in a worm and a worm wheel working subsequently. The minimum number of pairs of teeth in continuous cooperation in cylindrical worm gears usually does not fall below 2 (Fig. 2), whereas in globoidal worm gears the number of pairs of teeth being at the same time in the mesh can reach 5 (Fig. 2) or more. Moreover they are silent-running. Among the problems most frequently occurring in the process of the gear exploitation there is a proper selection of lubricator, its amount, and the way of complementing it as well as the frequency of its replacement. This problem results from a serious fault characteristic for worm gears. Due to a specificity of their teeth geometry a great amount of heat is ernitted during the work. Thus the exploitation of the gears consists mainly in quick reception of the losses of thermal energy in the mesh and in dissipating it as quickly as possible. In order to offer a solution to the above problems mathematical relations, graphs, tables and appendant drawings supported by specific examples have been included in the paper. . This short description already gives a clue of the difficulty of decisionmaking on the selection of proper worm gear for drive transrnission in a given machine or a mechanical device. A description of the course of action when selecting a worm gear also offered in the paper can be helpful in such cases. The paper provides a complete idea of the elastothermohydrodynarnic lubricating theory in worm teeth as well as a complete description of mathematical and physical relations. The whole theory has been illustrated with an example. The considerations have also been supported by a description of numerous experiments made on models as well as on real gears and devoted to the type of friction taking place in the worm teeth in various exploitation conditions. The contents of the paper also include a complete selection of lubricating agents, with oils and greases. The influence of the assembling and of the gear running-in on the further exploitation parameters has been described, with a stress placed on an important feature of self-locking. The current state and the perspectives of worm gears development have been presented and further tendencies and directions in the research have been introduced.