Topic
Critical speed
About: Critical speed is a research topic. Over the lifetime, 2764 publications have been published within this topic receiving 31365 citations.
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09 Dec 1987
TL;DR: In this paper, the arrangement of an additional mass which is coupled to the secondary mass of a split flywheel was proposed to improve the torsional vibrations of the drive system both in the supercritical speed range and during passage through the critical speed range.
Abstract: The invention relates to the arrangement of an additional mass which is coupled to the secondary mass of a split flywheel. When appropriately coupled, such an additional mass is capable of improving the torsional vibrations of the drive system both in the supercritical speed range and during passage through the critical speed range.
10 citations
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TL;DR: In this article, a mathematical model of an automotive transmission is developed, that considers the flexibility of the shafts, bearings, and gear teeth, and gyroscopic effects of geared rotors.
Abstract: A mathematical model of an automotive transmission is developed, that considers the flexibility of the shafts, bearings, and gear teeth, and gyroscopic effects of geared rotors. The transverse, torsional, and axial motions are strongly coupled due to helical gearing. The excitation forces acting on the automotive transmission are classified into first, second, and third grades, based on the magnitudes of the forces that are determined by the perturbation method. The excitation forces are caused by the mass imbalances among gears, misalignment of shafts, clearance and non-linear deformation of bearings, transmission errors, and the periodic variation of the gear mesh stiffness. A bench test on loading conditions is carried out for the third speed of the automotive transmission. The experimental results of vibration characteristics are compared with those from theoretical analysis. The results show good agreement, i.e., within a tolerance of 3.3%.
10 citations
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TL;DR: In this article, the authors investigated the transverse vibration characteristics and stability of a moving membrane with several intermediate elastic supports considering the translating speed of the moving membrane and derived motion equations of the vibration system according to the membrane vibration theory and the D'Alembert principle.
Abstract: The transverse vibration characteristics and stability of a moving membrane with several intermediate elastic supports are investigated considering the translating speed. The motion equations of the vibration system are derived according to the membrane vibration theory and the D'Alembert principle. The constraint of the middle printing roller to the membrane is used as the intermediate support which is replaced by the constraint force. And the vibration characteristic equation is established by using Laplace transformation method and the numerical calculation method. Finally, the relationships between the natural frequency of the moving membrane and the translating speed, tension, supporting position and rigidity modulus are analyzed respectively, and the critical speed when the membrane is in a stable state is obtained. The conclusions provide a theoretical basis and effective approaches for improving the work stability of the printing press.
10 citations
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TL;DR: In this article, a system for real-time control of the transverse vibration of a rotating circular plate, based on a thermal stressing technique and dynamic system identification, is presented.
Abstract: A system for real-time control of the transverse vibration of a rotating circular plate, based on a thermal stressing technique and dynamic system identification, is presented in this paper. In this method the plate natural frequency spectrum is modified through the purposeful introduction of thermal membrane stresses. The critical speed is maximized. In effect vibration is controlled through real-time control of the plate design. Evaluations with computer simulation and experimental measurements on a thin circular plate verify the system capability to control transverse vibration in a changing thermal environment.
10 citations
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01 May 2016
TL;DR: In this article, the authors investigated the vibration stress of a single-stage fan blade influenced by the interactio-theoretic interaction between the vibration and resonance in an aircraft engine, and found that resonance is the main cause of failure in aircraft engine blades.
Abstract: The vibration stress caused by resonance is the main cause of failure in aircraft engine blades. The study investigated the vibration stress of a single-stage fan blade influenced by the interactio...
10 citations