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Aerodynamic support for a big rotating machines
Šimek, J. ; Kozánek, Jan ; Šafr, M.
Aerodynamic bearing support for a 100 kW input industrial turboblower was designed and partly tested. Rigid rotor with about 50 kg mass was run up to the maximum operating speed of 18.000 rpm. The rotor is supported in two aerodynamic tilting-pad journal bearings 120 mm in diameter, the axial forces are taken up by aerodynamic thrust bearing 250 mm in diameter. The tests showed trouble-free operation of journal bearings up to maximum operating speed.
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Aerodynamické uložení průmyslového rotoru turbodmychadla o výkonu 100 kW
Šimek, J. ; Kozánek, Jan ; Šafr, M.
Aerodynamic bearing support for the rotor of a 100 kW input industrial turboblower with operational speed of 18.000 rpm was designed and manufactured. Rotor with mass of about 50 kg is supported in two tilting-pad journal bearings 120 mm in diameter, axial forces are taken up by aerodynamic spiral groove thrust bearing 250 mm in diameter. In the paper some specific features of the bearing design are described and the results of rotor relative vibration measurement during putting the machine into trial operation are presented.
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Active control of the electromagnet force
Vaněk, František ; Cibulka, Jan ; Kozánek, Jan
The prototype of the active control of electromagnet force with the help of modern insulated gate bipolar transistors in bridge connection excited by the integrating circuit with the overload protection was proposed and verified. The maximal generated force was about 2kN and the circuit efficiency was better than 80%.
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Impact damper with Hertz's dynamic contact
Půst, Ladislav
The paper contains results of analytical and numerical investigation of the oscillations of 2DOF system in which the amplitudes are limited by one- or two-sided stops. It is shown that the application of stops in absorber subsystem can get lower the amplitudes of basic external forced system approx to 50%. The efficiency of stops application on self-excited system is very low.
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Rotor supported on magnetic bearings - numerical and experimental analysis
Půst, Ladislav ; Kozánek, Jan ; Veselý, Jan
The dynamic properties of rotor supported on passive magnetic bearingsis investigated by means of numerical solution and by measurement on the prototypeof experimental set developed in Institute of Thermomechanics AS CR. Mathematicalmodel was constructed both for linearized part of rotor with bearing and for stronglynonlinear system including impacts in retainer bearings. Comparison with resultsof measurement on prototype enables to ascertain real parameters of linearized partof magnetic bearings.
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