Results 1 to 10 of about 24,495 (308)
Xibei Gongye Daxue Xuebao, 2019 Exploration of oil or gas wells is usually carried out by using drilling system. When the kilometers of drilling system is externally disturbed, the drilling system is prone to undesired stick-slip vibration of the drill-string.
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Self-excited vibrations in turning: forces torsor analysis [PDF]
The International Journal of Advanced Manufacturing Technology, 2008 The present work deals with determining the necessary parameters considering a three dimensional model to simulate in a realistic way the turning process on machine tool. This paper is dedicated to the study of the self-excited vibrations incidence on various major mechanics characteristics of the system workpiece / tool / material. The efforts (forces
Bisu, Claudiu-Florinel +4 more
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Operating mechanism and optimization of dynamic absorber for a system with negative damping
Nihon Kikai Gakkai ronbunshu, 2016 The self-excited vibration, such as galloping, dry friction induced vibration and so on, often occurs in many mechanical systems and structures. For several years, the effectiveness of a dynamic absorber for self-excited vibration has been known. However,
Tomoyuki TANIGUCHI, Takahiro KONDOU
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Simplified prediction of stability limit for oil film bearing rotor systems
Nihon Kikai Gakkai ronbunshu, 2020 Oil film bearings are often used in large rotating machinery because they have large load capacity and damping coefficients. They, however, generate fluid forces and cause unstable vibrations such as oil whirl and oil whip at high rotational speed ...
Yasuhisa SEKIGUCHI +3 more
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On the influence of the lamella's elasticity on self‐excited vibrations in gearboxes [PDF]
PAMM, 2016 AbstractEek noise in a gearbox of a vehicle drivetrain is a phenomenon, which can arise while shifting between gears and which is not accepted by customers. Beneath audible squeaking, it can cause damage of mechanical components. There is a wide range of possible reasons for the occurrence of this effect, which strongly depends on properties of the ...
Jehle, Georg, Fidlin, Alexander
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Self-Excited Vibration Analysis for the Feed Support System in FAST
International Journal of Advanced Robotic Systems, 2014 China is currently building the largest single dish radio telescope in the world, which is called the Five-hundred meter Aperture Spherical radio Telescope (FAST). The feed support system in the FAST is composed of a cable-driven parallel manipulator, an
Xiaoqiang Tang +3 more
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Study on the Different Effects of Power and Trailer Wheelsets on Wheel Polygonal Wear
Shock and Vibration, 2020 The wheels of power and trailer wheelset show different polygonal characteristics since their structures are obviously different. Therefore, the frictional self-excited vibration models of wheelset-track systems are established based on the viewpoint of ...
X. N. Zhao +3 more
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Journal of Low Frequency Noise, Vibration and Active ControlBy the analytical method, this paper investigates the mode-coupling friction-induced instability and the resulting stick-slip self-excited vibration of the marine stern water-lubricated rubber bearing-shaft system.
Chuang Wu +4 more
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Vietnam Journal of Mechanics, 2009 The paper presents an extended averaged equation approach to the investigation of nonlinear vibration problems. The proposed method is applied to some free/self excited oscillator, nonlinear free and forced oscillations of a suspension system with two ...
Nguyen Dong Anh +2 more
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Actuating mechanism and design of a cylindrical traveling wave ultrasonic motor using cantilever type composite transducer. [PDF]
PLoS ONE, 2010 BACKGROUND: Ultrasonic motors (USM) are based on the concept of driving the rotor by a mechanical vibration excited on the stator via piezoelectric effect.
Yingxiang Liu +3 more
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