Výsledky vyhledávání - "Josef Voldřich"

A study of hydrodynamically lubricated contact between axial rings of a high-speed gearbox

Publikováno v: THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2020).

The paper investigates the pressure field and losses in hydrodynamically lubricated contact between axial rings of the pinion and the wheel of a high-speed gearbox under steady-state load. For that reason, a computer program was developed to numerica

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::263039ba16166025639ac78c8dcaf968
https://doi.org/10.1063/5.0042747

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Finding the Stiffnesses of Interface Contact Elements for the Computational Model of Steam Turbine Blading

Autor: Jan Lazar, Štefan Morávka, Pavel Polach, Josef Voldřich

Publikováno v: Volume 8: 29th Conference on Mechanical Vibration and Noise.

A method is proposed for fitting the so-called contact stiffnesses (CSs) of interface elements for a nonlinear dynamic model (NDM) of a bladed disk with integral contact couplings. The method is based on comparison between frequencies of the resonant

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f4f1800e9831c9b77ecf40f371e262ea
https://doi.org/10.1115/detc2017-67712

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Use of Cyclic Symmetry Properties in Vibration Analysis of Bladed Disks with Friction Contacts between Blades

Autor: Jan Lazar, Pavel Polach, Tomáš Míšek, Josef Voldřich

Publikováno v: Procedia Engineering. 96:500-509

The development of steam turbine's blades is closely related to the computer modelling of their vibrations. In this work, a numeric method that (i) implements the calculation of nonlinear vibrations (ii) makes use of the cyclic symmetry of the bladed

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1747dbc18de2cf997761fd2be7761a10

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Frictionally Excited Thermoelastic Instability and the Suppression of Its Exponential Rise in Disc Brakes

Autor: Jan Sroub, Josef Voldřich, Michal Švantner, Milan Honner

Publikováno v: Journal of Thermal Stresses. 33:427-440

This paper deals with processes of thermoelastic instability occurring on brake systems that become evident as a non-uniform distribution of temperature with hot spots on contact surfaces. Thermoelastic instability is accompanied by the exponential r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::720e78bb48825975eeba158987383d25
https://doi.org/10.1080/01495731003733102

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Frictionally excited thermoelastic instability in disc brakes—Transient problem in the full contact regime

Autor: Josef Voldřich

Publikováno v: International Journal of Mechanical Sciences. 49:129-137

Exceeding the critical sliding velocity in disc brakes can cause unwanted forming of hot spots, non-uniform distribution of contact pressure, vibration, and also, in many cases, permanent damage of the disc. Consequently, in the last decade, a great

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a14e0738e22c24b1681c4a808bc08b18
https://doi.org/10.1016/j.ijmecsci.2006.08.008

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Neumann problem for elliptic equation in Sobolev power weighted spaces

Autor: Josef Voldřich

Publikováno v: Mathematics and Computers in Simulation. 61:199-207

The Neumann problem for an elliptic equation in a bounded domain Ω ⊂ RN and for external forces with degenerations or singularities relating to the m-dimensional variety M ⊂ δ Ω are considered. The underlying ideas of proof of the existence of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::45aaf6e7da3d94d17551acc8f37c2045
https://doi.org/10.1016/s0378-4754(02)00076-9

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Averaging over N-dimensional balls and Cauchy problem for equations of mathematical physics

Autor: Josef Voldřich

Publikováno v: Journal of Mathematical Analysis and Applications. 272(2):582-595

In this paper, we deal with averaging over balls in E N and derive an equality describing a relation between scale and space dependence of the average function. We also show connections with equations of mathematical physics.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cf77e4fbe5af4f60a12416279fd3b5f0

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Raman thermometry: Effective temperature of the nonuniform temperature field induced by a Gaussian laser

Autor: Josef Voldřich, Jan Očenášek

Publikováno v: Journal of Applied Physics. 118:233104

Raman spectroscopy is a widely applied analytical technique with numerous applications that is based on inelastic scattering of monochromatic light, which is typically provided by a laser. Irradiation of a sample by a laser beam is always accompanied

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::78bc577ec21895bc5cdf69aaa52ad220
https://doi.org/10.1063/1.4937904

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