Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: przesuw

Sortuj według:

Ogranicz wyniki do:

Mechanical Properties and Sliding Wear Resistance of Suspension Plasma Sprayed YSZ Coatings

Łatka Leszek, Szala Mirosław, Macek Wojciech, Branco Ricardo

Advances in Science and Technology. Research Journal

2020

Vol. 14, no 4

307--314

In this work, the yttria stabilised zirconia ZrO2 + 8 wt% Y2 O3 (YSZ) coatings were studied. The coatings were manufactured by using a relatively new method based on liquid feedstock, called suspension plasma spraying (SPS). The main aim of the study was to investigate the influence of one of the fundamental process parameters, stand-off distance, on the YSZ coating mechanical properties, namely adhesion, cohesion, hardness, and dry sliding wear resistance. Moreover, the coating surface morphology and microstructure were investigated. Despite the fact that in the SPS method, the heat flux into the substrate is much higher than in conventional atmospheric plasma spraying (APS), for the stand-off distances as short as 40 mm, the structure has not been damaged by thermal stresses. The results revealed that shorter spray distance leads to obtaining the coatings characterised by higher cohesion and adhesion to the substrate as well as higher hardness and resistance to sliding wear. The wear mechanism of both YSZ coatings relies on the adhesive mode, which is intensified by severe coating material delamination.

Model matematyczny wahań przestrzennych wagonu pasażerskiego

Dailydka S., Lingaitis L. P., Myamlin S., Prichodko V.

Eksploatacja i Niezawodność

2008

nr 4

4-8

Dla komfortu podróżnych i dla zapewnienia trwałości części i zespołów taboru kolejowego niezbędnym jest wybór racjonalnych parametrów zawieszenia podwozia, tj. ustalić racjonalne stosunki pomiędzy dwoma elementami sztywności stopni zawieszenia i tłumienia drgań. Niniejszy artykuł jest przeznaczony dla stworzenia przestrzennego modelu matematycznego, gdy istnieje zawieszenia z dwoma stopniami i różnymi elementami sztywności. Opracowany system równań posiada 52 stopnie swobody. Przedstawiony model matematyczny może byś stosowany dla ustalenia rzeczywistych obciążeń dynamicznych wagonów pasażerskich i przez to do wyboru racjonalnych parametrów krótkich zawieszeń.

To ensure passenger comfort as well as the durability of the components of rolling stock, it is necessary to determine the rational parameters of chassis suspension, i.e. rational relations between rigidity and vibration inhibition elements of the two stages of chassis suspension. The article describes a spatial mathematical model of a two-stage suspension that has different rigidity elements. The equation system created has 52 degrees of freedom. The model presented in this article can be employed to establish the real dynamic load of passenger wagons and to determine the rational parameters of resilient suspension.

Passive control of a beam subject to travelling

Bajer Cz., Bogacz R., Imiełowski Sz.

Engineering Transactions

2000

Vol. 48, iss. 3

283-292

The subject of the study is the minimization of transverse vibration of elastic guideway excited by high-speed travelling inertial load. Two types of systems of passive control are considered, the post truss system and the dynamic vibration absorbers. In the first one, the beam is supported by posts fixed to the beam span and prestressed by tendons connected to the ends of beam. The considered system corresponds to the experimental test stand. It is modelled by a simply supported Bernoulli-Euler beam, where the material passive damping is represented by means of the Voigt model. In the system the control is performed by point transverse forces and bending moments applied to the beam span. The significant reduction of the amplitude of vibrations is achieved for a guideway supported by truss system consisting of two posts. The obtained results are compared with the data obtained for active control of the considered guideway.