Praktika proektirovaniya gazovykh podshipnikov dlya kholodil'nykh mashin. Chast' II. Proektirovanie i metodika rascheta gibridnykh podshipnikov

Candidate of physicomathematical sciences P.V. Bulat, University ITMO. St.Petersburg The article examines the practice of design and calculation of hybrid bearings including the definition of the bearings capacity and account of dynamical regimes of operation. The putting of the direct task of calculation is set up. In the course of the task the distribution of pressure forces, speed fields are calculated according to a given geometry of the bearing segment and the thickness of the lubrication layer. Also a resultant of pressure forces affecting the segment is defined. At resolving the inverse task the algorithm of defining the bearing parameters according to a designated bearings capacity and consumption of a working medium is given. A special attention is paid to the calculation of rotating selfadjusting segments that provide an additional lift force at rotation due to the Bernoulli Effect. The information on optimization of the segment form and the system of air supplying of the segment hybrid bearing is cited. The advantages of the bearing at closed loop and crescentshaped nozzle are shown. The main types of nonstationary motions of the shaft are examined as follows: semispeed rotation, parametric resonance, Sommerfeld effect, beating. A “quantization” of limited cycles of the rotor precessing at different levels of initial agitations is shown. Keywords: gasstatic bearing, gasdynamic bearing, design and method of calculation of hybrid gas bearings, gas lubrication

газостатический подшипник, газодинамический подшипник, проектирование и методика расчета гибридных газовых подшипников, газовая смазка