Download or read book Steady state and Transient Analysis of a Squeeze Film Damper Bearing for Rotor Stability written by L. E. Barrett and published by . This book was released on 1975 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steady state and Transient Analysis of a Sqeeze Film Damper Bearing for Rotor Stability written by L.E. Barrett and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steady state and Transient Analysis of a Squeeze Film Damper Bearing for Rotor Stability written by Lloyd Edward Barrett and published by . This book was released on 1975 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and application of squeeze film dampers for turbomachinery stabilization written by Edgar J. Gunter and published by . This book was released on 1975 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Dynamics of the Squeeze Film Damper written by Bindingnavale Ranga Krishna Kumar and published by . This book was released on 1980 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear analysis of squeeze film dampers design and application for aircraft engines written by Edgar J. Gunter and published by . This book was released on 1976 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Oil squeeze film Damping on Steady state Response of Flexible Rotor Operating to Supercritical Speeds written by Robert E. Cunningham and published by . This book was released on 1977 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Squeeze Film Dampers in High Speed Turbomachinery written by Sina Hamzehlouia and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Unbalance induced vibrations are the main source of structural vibrations in high-speed turbomachinery. This mass unbalance is associated with the limitations and imperfections in manufacturing rotor systems and leads to a synchronous load cycle in the rotor. Squeeze film dampers (SFDs) are essential components in high-speed turbomachinery, including aircraft jet engines, high-performance compressors, gas turbines, and automotive turbochargers, which are incorporated to attenuate or completely suppress the steady-state unbalance induced vibration amplitudes at the resonance frequencies, reduce the forces transmitted to the supports, and to ensure the stable operation of the system. Conventionally, the dynamics of SFDs are characterized by using Reynolds equation, where it is assumed that the effect of fluid film inertia is negligible relative to the viscous effects. However, at large velocities, the inertia forces are significantly large and the effect of fluid inertia can no longer be neglected. Additionally, the design and analysis of SFDs are generally based on isothermal conditions; however, the thermophysical properties of the bearing lubricant strongly depend on the local state of temperature. At high operating speeds, the bearings may experience significant temperature rise, since the viscous dissipation that is associated with the shear motion, as well as the heat transfer with the bearing surfaces, can generate significant temperature and viscosity variations within the lubricant film, which ultimately influences the static and dynamic performance of the bearing considerably. The objective of this thesis is to develop a comprehensive model for SFDs in high-speed turbomachinery. The proposed model incorporates the effect of fluid film inertia and thermal effects to provide a precise prediction of the SFD behavior at high velocities. In order to achieve this objective, the effect of lubricant inertia at different SFD operating conditions, including small and large amplitude motions of the journal center, are formulated by using momentum approximation and perturbation method, and for different damper geometries, including finite-length and short-length dampers. The results of the analysis demonstrate the significant influence of fluid inertia on the shape, phase, and magnitude of the SFD pressure distribution as well as the magnitude and direction of the fluid film reaction forces. Subsequently, a finite element based rotodynamic model is developed for multi-mass flexible rotors and the proposed SFD models are incorporated into the rotordynamic model to study the effect of SFD fluid film inertia on the unbalance induced steady-state vibration amplitudes and transient orbits of high-speed rotors. The results of the rotordynamic analysis confirmed the considerable influence of SFD fluid inertia on the attenuation of the unbalance induced vibrations at resonance zones. Finally, a detailed thermohydrodynamic (THD) model incorporating the full term Navier-Stokes equations, the energy equation for the lubricant, the Laplace heat conduction equation for the surrounding solids, including bushing and shaft, and realistic thermal boundary conditions is developed to investigate the effect of temperature variation on the dynamics of SFDs.
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1976 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Oil squeeze film Damping on Steady state Response of Flexible Rotor Operating to Supercritical Speeds written by Robert E. Cunningham and published by . This book was released on 1977 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1975 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1983 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1976 with total page 1408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1975 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by and published by . This book was released on 1977 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Contractor Report written by United States. National Aeronautics and Space Administration and published by . This book was released on 1975 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:
