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网页Critical speed (n k) is the rotational speed at which acting dynamic forces cause a machine component (e. g. shaft, rotor) to vibrate at its natural frequency (also referred to as intrinsic frequency, fi) and can even result in resonant vibrations throughout the entire machine 网页7.2.4.1 Critical speed map. A critical speed map is a graph representing the effect of the stiffness of the rotor support on the critical speed of the rotor, where the bearings on both 网页The critical speed is the minimum speed that an object must have at the top position of a vertical circular path in order to remain in circular motion. The centripetal force acting on 网页2015年11月27日 The effects of such vibrations is to increase the shear stress and hence total stress levels carried by the crankshaft in service, when other stresses such as 网页2021年9月21日 The critical speed is the angular velocity that excites the natural frequency of the rotating objects like rotors, shaftsetc., resulting in severe vibration of the shaft in 网页2011年2月2日 The findings of this study suggest that critical speed-related increases in stroke rate are an indirect consequence of increased force production in the power phase 网页2022年5月1日 Another reason to evaluate piping and foundation designs with the pump as a total system. The first critical speed for the Starship Enterprise NCC 1701-D is well 网页2023年2月6日 An object is said to reach critical speed when the speed of its rotation corresponds to one of its natural frequencies. This type of speed is studied in a branch of 网页大量翻译例句关于"speed critical" 英中词典以及8百万条中文译文例句搜索。Provision of backbone communications services, including Internet, private leased lines, 网页In order to investigate the influence law of chip formation process affected by grinding speed,the single-grain tests are carried out on the difficult to cut materials superalloy 网页7.2.4.1 Critical speed map. A critical speed map is a graph representing the effect of the stiffness of the rotor support on the critical speed of the rotor, where the bearings on both sides of the rotor have equal stiffness. On a critical speed map, the abscissa denotes the stiffness of the bearing, while the ordinate is the critical speed of 网页The critical speed is the minimum speed that an object must have at the top position of a vertical circular path in order to remain in circular motion. The centripetal force acting on an object is proportional to the square of the linear velocity. The formula for the critical speed of an object is v c = g r. 网页2021年9月21日 The critical speed is the angular velocity that excites the natural frequency of the rotating objects like rotors, shaftsetc., resulting in severe vibration of the shaft in the transverse direction. Critical speed is also known as the whirling speed of the shaft. 网页2012年11月24日 A uniform axially moving beam travels between two supports separated by distance l with the transport time-dependent speed Γ(T). Timoshenko theory. When the effects of rotary inertia and shear deformation are considered, the bending vibrations can be described by the transverse displacement of the mid-plane V(X,T) and its slope φ(X,T).T 网页2015年11月27日 The effects of such vibrations is to increase the shear stress and hence total stress levels carried by the crankshaft in service, when other stresses such as bending and combustion loads are present. The critical speed of a shaft occurs when the shaft rotational speed is at or close to resonant conditions. In this condition the torsional 网页2022年7月26日 The critical speed N c of a shaft is simply. Where m = the mass of the shaft assumed concentrated at single point . k is the stiffness of the shaft to traverse vibrations. For a horizontal shaft this can be expressed as. Where y = the static deflection at the location of the concentrated mass. Symbols. m = Mass (kg) N c = critical speed (rev/s 网页2023年2月6日 An object is said to reach critical speed when the speed of its rotation corresponds to one of its natural frequencies. This type of speed is studied in a branch of physics known as rotordynamics, which deals with rotational, or angular, motion. A rotating object, such as a propeller or a centrifugal pump, must often pass through one or more of 网页2011年2月2日 The findings of this study suggest that critical speed-related increases in stroke rate are an indirect consequence of increased force production in the power phase of the stroke, and that bilateral asymmetry is both intensity- and stroke-phase dependent. Abstract The main aim of this study was to determine the absolute temporal relationship 网页2020年8月6日 to note that the majority of present methods for calculating critical speeds are based upon finding the natural lateral frequencies of undamped motion. From this simple model it is seen that the normal unbalanced rotor doesn' t vibrate in a plane but revolves or precesses to form an orbit. Case I11 Secondary Critical Speed (Effect of Gravity) 网页Despite the positive effect of the misalignment on the critical speed of the rotor supported by the journal bearing,it reduces the bearing’s designed load-carrying capacity, which corresponds to a predefined level of minimum film thickness that will be negatively affected by the presence of misalignment. In such a case, a well-designed 网页2021年3月9日 Any critical speed—first, second, or higher—may be calculated with equal ease. Effect of a Planetary Gearbox on the Dynamics of a Rotor System. GT2018. Harmonic Analysis of the High Speed Direct Coupled SCO2 Turbo-Generator. GTINDIA2021. Turbulent Flow Between Two Discs Contra-Rotating at Differential 网页2015年11月1日 Furthermore, the anisotropy, damping, temperature and gyroscopic effect should be considered for the influence on the critical speed of the rotor-shaft assembly in the future work. 5 Acknowledgments This work was supported by the National Major Project for the Development and Application of Scientific Instrument Equipment of China under grant 网页2021年9月21日 The critical speed is the angular velocity that excites the natural frequency of the rotating objects like rotors, shaftsetc., resulting in severe vibration of the shaft in the transverse direction. Critical speed is also known as the whirling speed of the shaft. 网页2022年3月12日 Turbochargers have been widely used in various base conditions, such as horizontal, vertical, or inclined. The prediction of the dynamics is of utmost importance to inclined turbocharger designers. In this , the effect of weight on the critical speed of an inclined turbocharger rotor coupled with floating ring bearings is investigated. The 网页2020年7月15日 Critical speed is defined as the operating speed, at which the excitation frequency of rotating sys- And due to the coupling effect, the critical speeds of a dual rotor system are usually classified as critical speeds excited by 网页2012年11月24日 A uniform axially moving beam travels between two supports separated by distance l with the transport time-dependent speed Γ(T). Timoshenko theory. When the effects of rotary inertia and shear deformation are considered, the bending vibrations can be described by the transverse displacement of the mid-plane V(X,T) and its slope φ(X,T).T 网页2023年2月6日 An object is said to reach critical speed when the speed of its rotation corresponds to one of its natural frequencies. This type of speed is studied in a branch of physics known as rotordynamics, which deals with rotational, or angular, motion. A rotating object, such as a propeller or a centrifugal pump, must often pass through one or more of 网页2020年4月10日 Figure 2. Lateral Critical Speed Map for No Seal Effects. Principal horizontal and vertical bearing stiffnesses for minimum and maximum bearing clearances are superimposed. The dry rotor undamped natural frequencies as predicted by the critical speed map for the first, second, and third modes were 1710, 6650, and 8830 cpm, 网页2022年8月16日 A critical speed map can provide a great deal of insight on the potential behavior of a rotor-bearing system without requiring a lot of model detail. Let’s explore how the CSM can be a helpful design tool by 网页Despite the positive effect of the misalignment on the critical speed of the rotor supported by the journal bearing,it reduces the bearing’s designed load-carrying capacity, which corresponds to a predefined level of minimum film thickness that will be negatively affected by the presence of misalignment. In such a case, a well-designed
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