scholarly journals Thermo-mechanical behavior analysis of motorized spindle based on a coupled model

2018 ◽  
Vol 10 (1) ◽  
pp. 168781401774714 ◽  
Author(s):  
Junfeng Liu ◽  
Peng Zhang
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Dynamic Properties ◽  
Dynamic Test ◽  
Coupled Model ◽  
Solution Procedure ◽  
Motorized Spindle ◽  
Proposed Model ◽  
Motorized Spindles ◽  
Rotor Dynamic

This article presents a thermo-mechanical coupled dynamic model for high-speed motorized spindles. The proposed model includes an angular ball bearing model, a thermal model, and a rotor dynamic model. The coupling relationship among these submodels is analyzed, and a solution procedure for the integrated model is designed. Based on the proposed model and solution procedure, the dynamic behaviors of the spindle system and the effects of the thermal displacement of the system on the behaviors are quantificationally discussed. Finally, an integrated dynamic test is carried out on a D62D24A-type motorized spindle, and the good agreement between the mathematical results and the experimental data indicates that the proposed model is capable of accurately predicting the dynamic properties of motorized spindles, and the accuracy of the model is improved when considering the thermo-mechanical coupled factor. The conclusions are useful for the dynamic design and the thermal compensation control of high-speed motorized spindles.

An integrated model for high-speed motorized spindles – Dynamic behaviors

2013 ◽  
Vol 227 (11) ◽  
pp. 2467-2478 ◽  
Author(s):  
Xiao-an Chen ◽  
Jun-feng Liu ◽  
Ye He ◽  
Peng Zhang ◽  
Wen-tao Shan
Keyword(s):  
Dynamic Model ◽  
Heat Generation ◽  
Thermal Model ◽  
High Speed ◽  
High Efficiency ◽  
Solution Procedure ◽  
Integrated Model ◽  
Dynamic Behaviors ◽  
Dynamic Performances ◽  
Motorized Spindles

With increasing popularity in high-speed machining due to its high efficiency, there is a vital need for more accurate prediction of dynamic behaviors for high-speed motorized spindles. The spindle units integrate tools with built-in motors hence a comprehensive model is required to include the multi-physics coupling property. This article presents an integrated model which consists of four coupled sub-models: state, shaft, bearing, and thermal model. Using the variational principle, a state model for the motor-spindle system is generated, which can describe the running state of the spindle, and provide electrical parameters to study the motor heat generation for thermal model and the unbalanced magnetic force for shaft dynamic model. The thermal model is coupled with the bearing and shaft dynamic model through bearing heat generation and thermal displacement. Thus, the entire model becomes an integrated electro-thermo-mechanical dynamic model. The proposed integrated model is investigated by a solution procedure and validated experimentally, and it shows that the model is capable of accurately predicting the dynamic behaviors of motorized spindles. The coupling relationship among the electrical, thermal, and mechanical behaviors of the system becomes clear from the simulation and experimental results, and some feasible methods to improve the dynamic performances of the system are obtained.

scholarly journals Dynamics Analysis of Unbalanced Motorized Spindles Supported on Ball Bearings

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Junfeng Liu ◽  
Tao Lai ◽  
Xiaoan Chen
Keyword(s):  
High Speed ◽  
Magnetic Force ◽  
Numerical Solutions ◽  
Dynamic Properties ◽  
Lyapunov Stability Theory ◽  
Force Model ◽  
Proposed Model ◽  
Dynamic Operating ◽  
Motorized Spindles ◽  
Good Agreement

This paper presents an improved dynamic model for unbalanced high speed motorized spindles. The proposed model includes a Hertz contact force model which takes into the internal clearance and an unbalanced electromagnetic force model based on the energy of the air magnetic field. The nonlinear characteristic of the model is analysed by Lyapunov stability theory and numerical analysis to study the dynamic properties of the spindle system. Finally, a dynamic operating test is carried out on a DX100A-24000/20-type motorized spindle. The good agreement between the numerical solutions and the experimental data indicates that the proposed model is capable of accurately predicting the dynamic properties of motorized spindles. The influence of the unbalanced magnetic force on the system is studied, and the sensitivities of the system parameters to the critical speed of the system are obtained. These conclusions are useful for the dynamic design of high speed motorized spindles.

Thermal Characters of the Air-Cooled High Speed Motorized Spindle for Wood-Working Machine

2013 ◽  
Vol 579-580 ◽  
pp. 568-572
Author(s):  
Da Guo Ma ◽  
Xin Bo Jiang
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Heat Dissipation ◽  
Element Model ◽  
Structure Design ◽  
Air Cooling ◽  
Heat Sources ◽  
Motorized Spindle ◽  
Dissipation Structure ◽  
Motorized Spindles

The structure and composition of the air-cooled high speed motorized spindle for wood-working machine and some features relative to the metal cutting motorized spindle are introduced briefly. Then the main heat sources and heat dissipation mechanism of the air-cooled motorized spindle are thoroughly analyzed, finite element model of the air-cooled motorized spindle is built, the motorized spindles temperature distribution under thermal steady state and the influence of speed are analyzed. The results show that air cooling relative to the water or oil cooling has many advantages and reasonable heat dissipation structure design of air-cooled motorized spindle could meet the requirements of the high-speed motorized spindle for wood-working machine.

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

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zhan Wang ◽  
Wenzhi He ◽  
Siyuan Du ◽  
Zhe Yuan
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Air Gap ◽  
Fault Analysis ◽  
Experimental Results ◽  
Machining Accuracy ◽  
Motorized Spindle ◽  
Unbalanced Magnetic Pull ◽  
Static Eccentricity ◽  
Simulation Results

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.

A System to Measure the Response of a High-Speed Rotor to a Sudden Imbalance

1981 ◽  
Author(s):  
R. J. Trippett
Keyword(s):  
High Speed ◽  
Dynamic Test ◽  
Data Acquisition System ◽  
Squeeze Film ◽  
Sudden Increase ◽  
Test Rig ◽  
Dynamic Data ◽  
Squeeze Film Damper ◽  
Rotor Dynamic ◽  
Dynamic Data Acquisition

A unique rotor dynamic data acquisition system is described to control the gathering and display of rotor displacement data measured at rotor speeds up to 70 000 r/min. The first published results measured with this system are demonstrated with plots of measured transient shaft motion after a sudden increase in shaft imbalance at speeds up to 44 500 r/min. The displacements of the rotor in the forms of Lissajous plots with and without a squeeze film damper are presented at four axial shaft locations below and above the shafts critical speeds. The blade-loss, dynamic test rig is also described.

SIMPLIFIED DYNAMIC MODEL FOR HIGH-SPEED CHECKWEIGHER

2013 ◽  
Vol 24 ◽  
pp. 1360036 ◽  
Author(s):  
YUJI YAMAKAWA ◽  
TAKANORI YAMAZAKI
Keyword(s):  
Dynamic Model ◽  
Measurement System ◽  
High Speed ◽  
Mass Measurement ◽  
Conveyor Belt ◽  
Open Loop ◽  
Model Parameters ◽  
Proposed Model ◽  
Control Scheme ◽  
Mass Damper

In this paper, we concern with the dynamic behaviors of a high speed mass measurement system with conveyor belt (a checkweigher). The goal of this paper is to construct a simple model of the measurement system so as to duplicate a response of the system. The checkweigher with electromagnetic force compensation can be approximated by the combined spring-mass-damper systems as the physical model, and the equation of motion is derived. The model parameters (a damping coefficient and a spring constant) can be obtained from the experimental data for open-loop system. Finally, the validity of the proposed model can be confirmed by comparison of the simulation results with the realistic responses. The simple dynamic model obtained offers practical and useful information to examine control scheme.

DESIGN OPTIMIZATION OF MOTORIZED SPINDLE BEARING LOCATIONS BASED ON DYNAMIC MODEL AND GENETIC ALGORITHM

2017 ◽  
Vol 41 (5) ◽  
pp. 787-803 ◽  
Author(s):  
Denghui Li ◽  
Hongrui Cao ◽  
Songtao Xi ◽  
Xiaoman Linand ◽  
Xuefeng Chen
Keyword(s):  
Genetic Algorithm ◽  
Design Optimization ◽  
Dynamic Model ◽  
Timoshenko Beam ◽  
Optimization Method ◽  
Beam Model ◽  
Timoshenko Beam Model ◽  
Motorized Spindle ◽  
Spindle Bearing ◽  
Motorized Spindles

In this paper, an optimization method based on dynamic model and genetic algorithm is proposed for the design of motorized spindle bearing locations. Firstly, the dynamic model of motorized spindles is developed based on the Timoshenko beam model and Jones’ quasi-static bearing model. Then, the developed dynamic model is validated with the hammer response test on a motorized grinding spindle system. Finally, the design optimization method is proposed by combining the dynamic model with genetic algorithm. In order to obtain higher rigidity, the optimal locations of bearings on the spindle are calculated with the genetic algorithm. The results show that the first mode natural frequency (FMNF) of the system increases by 12.38% than the original value after optimization.

scholarly journals Nonlinear Dynamic Modelling of Two-Point and Symmetrically Supported Pipeline Brackets with Elastic-Porous Metal Rubber Damper

Symmetry ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1479
Author(s):  
Xue ◽  
Ruan ◽  
Li ◽  
Bai ◽  
Xiao
Keyword(s):  
Dynamic Model ◽  
Nonlinear Dynamic ◽  
Dynamic Properties ◽  
Dynamic Test ◽  
Dynamic Modelling ◽  
Porous Metal ◽  
Nonlinear Damping ◽  
Pipeline System ◽  
Metal Rubber ◽  
Pipeline Vibration

This paper aims to investigate the nonlinear dynamic properties of a two-point and symmetrically supported pipeline bracket system coated with the damping element using an elastic-porous metal rubber. The dynamic model of the studied two-point and symmetric pipeline system was established based on impulse response matrix for accurate and reliable description on its nonlinear behaviours, e.g., energy dissipation and loss factor. The experimental verification of the developed model was performed by means of dynamic test as well as the analyses of nonlinear damping characteristics. The experimental results show a good agreement with the prediction results obtained from the proposed dynamic model. This work provides an alternative method to investigate the dynamics of pipeline vibration system equipped with a damping structure.

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