Dynamics Analysis of Unbalanced Motorized Spindles Supported on Ball Bearings

Liu, Junfeng; Lai, Tao; Chen, Xiaoan

doi:10.1155/2016/2787524

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…They used this dynamic model to show that the vibrations are proportional to the mass of the unbalance. Liu et al (2016) [22] presented an improved dynamic model for unbalanced high-speed motorized spindles, and obtained the sensitivities of the motorized spindles.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling of Motorized Spindle System with Unbalanced Mass and Spindle Inclination

Gu,

Xie,

Liu

et al. 2023

Applied Sciences

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The high-speed motorized spindle has been wildly used in the field of aerospace processing, due to its advantages such as high speed, high precision, and high efficiency. CNC machine tools used for processing aerospace products require high machining accuracy, and once the spindle fails, it will seriously affect the quality of product processing. Thus, it is important to study the faults of the spindle, especially the faults caused by subtle errors. In this work, a dynamic model of a spindle with unbalanced mass fault and spindle inclination fault is established, and the natural frequencies and mode shapes of the motorized spindle are calculated by using the whole transfer matrix method (WTMM). The deflections of the spindle initial end in the different situations are discussed when the two faults happen independently. The results show that the spindle end deflection of the same fault has different sensitivity at different speeds. At the third order of natural frequencies, the deflection of a motorized spindle is greatest regardless of the fault that occurs. Although the motorized spindle rotates at the same speed, different faults could cause different mode shapes. At the lower speed, when the unbalanced mass fault happens, the mode shape is in an arched shape, and while the spindle inclination fault happens, the mode shape is in a concave shape.

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Section: Introductionmentioning

confidence: 99%

Dynamic Modeling of Motorized Spindle System with Unbalanced Mass and Spindle Inclination

Gu,

Xie,

Liu

et al. 2023

Applied Sciences

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show abstract

“…In recent years, the vibration and fault dynamics of rotors similar to motorized spindle have always been a research hotspot in the field of rotor vibration, and a large number of scholars have carried out in-depth research. Liu proposed an improved dynamic model for unbalanced highspeed motorized spindle considering the internal clearance and air magnetic field energy [1]. Shi studied the orbitspinning behaviors of the outer ring in a full ceramic ball bearing-steel pedestal system in wide temperature ranges [2,3].…”

Section: Introductionmentioning

confidence: 99%

Study on the Unbalanced Fault Dynamic Characteristics of Eccentric Motorized Spindle considering the Effect of Magnetic Pull

Wang

et al. 2021

Shock and Vibration

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Unbalanced fault is the most common fault of high-speed motorized spindle, which is the main factor affecting the machining accuracy of high-speed spindle. Due to the unbalanced magnetic pull produced by the air gap eccentricity of the stator and rotor, the unbalanced vibration of the motorized spindle will be further aggravated. In order to explore the dynamic behavior and motion law of the unbalanced fault motorized spindle under the eccentric state, a dynamic model of the unbalanced fault of the high-speed motorized spindle considering the unbalanced magnetic pull was established. Taking the eccentric motorized spindle customized by the research group as the research object, the dynamic model is established, simulated, and analyzed, and the response change law of motorized spindle under the effect of different speed, unbalance, and air gap is obtained. The simulation results show that the unbalanced magnetic pull caused by static eccentricity will increase the unbalanced vibration of motorized spindle, and the unbalanced vibration will also increase with the increase of static eccentricity. The vibration caused by unbalanced magnetic pull does not increase with the increase of rotating speed. In frequency-domain analysis, when there is unbalanced magnetic pull, the peak appears at 0 Hz, and the amplitude of fundamental frequency vibration will increase with the increase of eccentricity. The experimental results show that the greater the eccentricity is, the greater the unbalance vibration of the motorized spindle is. The experimental results are consistent with the simulation results, which further verify the accuracy of the model. The research results lay a theoretical basis for fault analysis and diagnosis of coupling fault motorized spindle.

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“…Werner [14] employed the electromagnetic model with an electromagnetic moment to calculate radial and angular electromagnetic stiffnesses, the mass moment of inertia, and the gyroscopic effect of the rotor, but magnetic radical force is not considered. Liu et al [15] proposed a model including Hertz contact force and unbalanced electromagnetic force to study the dynamic properties of the spindle system. e studies [16][17][18] developed Maxwell stress tensor nonlinear harmonic methods and evaluated the vibration influence caused by UMP (Unbalanced Magnetic Pull).…”

Section: Introductionmentioning

confidence: 99%

Research on Vibration Characteristics of a Ceramic Spindle Based on the Reverse Magnetic Effect

Zhang

Wang

Shi

et al. 2019

Shock and Vibration

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The electromagnetic radial force about a ceramic spindle affects the spindle dynamic, which determines the quality of processing. Using a Timoshenko beam unit to build the dynamic model for the ceramic spindle, the dynamic characteristic of an angular contact ball bearing is analyzed using a nonlinear bearing model. The electromagnetic magnetization model was established based on Maxwell’s theory to calculate electromagnetic magnetic density and radial force. The influence about the reverse magnetic field characteristic of the ceramic rotating shaft and dynamic stiffness of the contact ball bearing on the dynamic phenomena of the spindle is analyzed, which is verified by experiments. The results show that the magnetic effect produced by the reverse magnetic of ceramic rotation shaft has a great influence on the electromagnetic radial force. Compared with the paramagnetic effect of the metal shaft, the dynamic characteristics of the spindle can be significantly improved. Considering the coupling relationship between the radial force of the magnetic field and the bearing contact force, dynamic stiffness, and other factors, the accuracy of the model simulation is highly consistent with the test results. In particular, the ceramic spindle model has been successful in predicting with high accuracy and is suitable for multiple extreme working conditions. The parameters, such as initial eccentricity of the rotor, bearing preload, and rotating speed, can be adjusted to restrain the vibration of spindle. The ceramic spindle model provides a theoretical basis for the dynamics development of a high-speed spindle.

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Dynamics Analysis of Unbalanced Motorized Spindles Supported on Ball Bearings

Cited by 3 publications

References 24 publications

Dynamic Modeling of Motorized Spindle System with Unbalanced Mass and Spindle Inclination

Dynamic Modeling of Motorized Spindle System with Unbalanced Mass and Spindle Inclination

Study on the Unbalanced Fault Dynamic Characteristics of Eccentric Motorized Spindle considering the Effect of Magnetic Pull

Research on Vibration Characteristics of a Ceramic Spindle Based on the Reverse Magnetic Effect

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