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EN
The article explores the stress-strain state of the pneumatic flexible shaft coupling of the tumbling mill drive using a software of finite element analysis. The study has revealed that the stress-strain state of the pneumatic flexible shaft coupling is characterized by an uneven general and local distribution of stresses. Areas of maximum stress and strain in the pneumatic flexible shaft coupling have been defined. The study allowed for changing the geometry and reducing the mass of the disc of the pneumatic flexible shaft coupling with a slight change in stresses and strains. The results of the study can be applied to the design of pneumatic flexible shaft couplings and serve as a basis for further research.
EN
The article explores the stress-strain state of the pneumatic flexible shaft coupling of the tumbling mill drive using a software of finite element analysis. The study has revealed that the stress-strain state of the pneumatic flexible shaft coupling is characterized by an uneven general and local distribution of stresses. Areas of maximum stress and strain in the pneumatic flexible shaft coupling have been defined. The study allowed for changing the geometry and reducing the mass of the disc of the pneumatic flexible shaft coupling with a slight change in stresses and strains. The results of the study can be applied to the design of pneumatic flexible shaft couplings and serve as a basis for further research.
EN
The contribution briefly approaches the author’s profile in the field of scientific research during his work at TU in Košice. More precisely, it presents a selected, specific area of torsional oscillation of mechanical systems concerning the characteristics, research and application of new elements, i.e., so-called pneumatic tuners of torsional oscillation (pneumatic couplings), a field that the author has long been devoted to. In the process, the article informs the reader about the development of new types of flexible shaft couplings, i.e., tangential and differential pneumatic couplings (also with autoregulation), presents the results of static and dynamic measurements made on certain couplings with the interconnection of pneumatic flexible elements and draws attention to the conditions involved in the application of these coupling types in torsionally oscillating mechanical systems.
EN
The optimal tuning of mechanical systems in terms of torsional vibration magnitude is a very important function in flexible shaft couplings. Therefore, a flexible coupling with suitable dynamic properties, particularly dynamic torsional stiffness, has to be carefully chosen for each specific application. The current trend in the field of flexible shaft couplings, and the most noticeable in the automotive industry, is the development and utilization of highly flexible couplings, which means flexible couplings with a very low value of relative torsional stiffness. The aim of this article is to introduce a new type of flexible shaft coupling: a piston pneumatic flexible shaft coupling. This coupling was developed to improve the properties of pneumatic flexible couplings, especially the maximum angle of twist, in order to create a highly flexible pneumatic coupling. For illustration purposes, the piston pneumatic coupling is compared with the tangential pneumatic flexible shaft coupling of Type 3-1/110-T-C in terms of high flexibility characteristics, whereby the characteristic dimensions of both couplings are the same. Given that the piston pneumatic coupling has not been manufactured to date, only a computational model of this coupling was used. The results show that the design of the piston pneumatic flexible shaft coupling combines the advantages of a highly flexible and pneumatic shaft coupling.
EN
In order to continuous tuning of the torsional oscillating mechanical system during its operation, we are making use of application of the pneumatic flexible shaft couplings, developed by us. By the gaseous media pressure change in pneumatic couplings we can change its torsional stiffness and thereby the dynamics of whole system too. In term of dynamics is necessary to know the character of transitional effects, which are arising at continuous tuning of mechanical system, so at gaseous media pressure changes in pneumatic coupling. Therefore the paper will pay attention on the ground of experimental measurements to examination of torsional oscillating mechanical system response to various gaseous media (in this case air) pressure changes in pneumatic coupling during operation of given system.
PL
W celu płynnej regulacji układu mechanicznego drgającego skrętnie w trakcie jego pracy, a więc podczas eksploatacji, stosujemy elastyczne sprzęgła pneumatyczne łączące wały. Za pomocą zmiany ciśnienia medium gazowego (powietrza) w sprzęgłach pneumatycznych zmieniamy ich sztywność skrętną, a przez to również dynamikę całego układu. Z punktu widzenia dynamiki należy poznać charakter stanów przejściowych układu mechanicznego, które powstają podczas jego płynnego strojenia, a więc podczas zmian ciśnienia medium gazowego w sprzęgle pneumatycznym. Dlatego też artykuł zajmuje się badaniem odpowiedzi układu mechanicznego drgającego skrętnie na różne zmiany ciśnienia powietrza w sprzęgle pneumatycznym podczas pracy danego układu na podstawie przeprowadzonych pomiarów eksperymentalnych.
6
Content available remote High-flexibility characteristics of pneumatic flexible shaft couplings
EN
The dangerous torsional oscillation has a profound influence upon the life-span and function and majority of segments of any mechanical systém. For this reason there is a need to control this dangerous torsional oscillation. Presently this problém is solved via application of flexible shaft couplings with the low torsional stiffness, that is via application of hig- hly flexible shaft couplings. The development and research of highiy flexible shaft couplings is an area of interest of our organization. Therefore, the aim ofthis páper is to inform the technical community about the design, work principle and high-flexibility comparison of pneumatic flexible shaft couplings developed by us.
PL
Każdy konstruktor stara się obniżyć poziom drgań skrętnych w układzie mechanicznym. Obecnie problem ten zazwyczaj jest rozwiązywany przez odpowiedni dobór właściwości dynamicznych sprzęgieł elastycznych w zależności od dynamiki układu. Zmienność właściwości dynamicznych współcześnie stosowanych sprzęgieł elastycznych, spowodowana starzeniem się i zmęczeniem ich elementów elastycznych, powoduje rozstrojenie układu mechanicznego. Biorąc pod uwagę ten fakt, proponujemy zastosowanie w układach mechanicznych innowacyjnych skonstruowanych przez nas sprzęgieł pneumatycznych, które podczas eksploatacji nie tracą swoich pierwotnych właściwości i pozytywnie wpływają na pracę rozpatrywanych układów.
EN
Designer all over the world make every endeavour to reduce torsional vibration in selected mechanical systems. Nowadays, the problem is usually solved by adaptation of flexible coupling dynamic characteristics to the characteristic of the individual systems. Mutability of dynamic characteristic of modern flexible couplings results in maladjustment of mechanical systems due of the ageing and fatigue of the flexible parts. Taking this into account we suggest the application of pneumatic couplings of our design in mechanical systems. The pneumatic couplings do not lose their initial properties and have a beneficial impact on the individual system operation.
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