The productivity and capacity release of hot-strip rolling is severely limited by pendular vibration. Previous studies on mill vibration have investigated the influence of rolling parameters on vertical vibration; however, the influence of dynamic stiffness compensation factors on vertical vibration has not yet been considered owing to the …

Considering other dynamic excitations including mesh stiffness, contact pressure angle, center distance, unbalance force caused by static and dynamic eccentricity, an advanced iterative numerical ...

2. FOUNDATION OF BALL MILL WITH GMD There are a number of Ball mills in operation around the world with diameter up to 8 m. Aspect ratio L/D varies for ball mills, L/D >1, typically 1.5 to 2.5 ...

Angular contact ball bearings are predominantly used for guiding high speed rotors such as machining spindles. For an accurate modeling, dynamic effects have to be considered, most notably in the bearings model. The paper is based on a dynamic model of angular contact ball bearings. Different kinematic hypotheses are discussed. A new …

According to the stiffness calculation formula, the dynamic stiffness value of the tested bearing under the current working condition can be obtained. Since the actual working conditions of the bearing are different, the dynamic stiffness of the 60TAC120B angular contact ball bearing under different working conditions is obtained …

In addition, based on the stiffness matrix calculation of ball bearing, Cao and Altintas [33,34] presented a theoretical model for the dynamic characteristics prediction and optimization design for the high-speed spindle system, then the model was further developed by taking account of the different preload mechanisms of ball bearing [35 ...

Bearing stiffness, as one of the most important service characteristics for ball bearing, plays a crucial role in the bearing design and rotor dynamic analysis. To rapidly and accurately calculate the …

This paper presents a novel mechanical and dynamic model considering runout to develop stability analysis suitable in five-axis ball end milling with low radial …

The stiffness models of angular contact ball bearings mainly include the quasi-static theoretical model, 18 the dynamic stiffness models, 19 and comprehensive …

TABLE2 Data used in the ball mill experiment Mill diameter 25.4 cm Mill length 29.2 cm Mill speed 70% of critical Lifter bar height (8) 0.32 cm Number of balls 109 Total ball weight 30.5 kg Average ball weight 0.28 kg Limestone hold-up 3.3 kg Energy consumed 78 J/revolution SIMULATION OF CHARGE MOTION IN BALL MILLS.

Finally, the dynamic stiffness and vibration model of angular contact ball bearing including the thermal-solid coupling effect is obtained, which is employed to realize the theoretical analysis of ...

The stiffness matrix of angular contact ball bearings is calculated by using the analytical approach in which the summation of ball-race lends is replaced by an integration.

The stiffness of the rolling bearing has a great influence on the dynamic characteristics of motorized spindle. In order to obtain the stiffness of angular contact ball bearing under oil-jet ...

The radial stiffness of rolling bearings is the basis for analyzing the dynamic performance of bearing-rotor systems. The changes of rolling element position may cause continuous change of radial ...

Ball screw feed drive system has become a key part of CNC machine tools owning to its advantages of high positioning accuracy and transmission efficiency, long operating life, and less internal ...

Radiation noise (RN) is an important parameter for representing the characteristics of a bearing. By simplifying a ball bearing as a mass–spring–damping system, the differential equations for the vibration of an angular contact ceramic ball bearing (ACCBB) are established from the view of energy conservation considering …

ABSTRACT Space mechanisms use preloaded ball bearings in order to withstand the severe vibrations during launch. The launch strength requires the calculation of the …

Dougdag et al [83] developed a simplified model of a nonlinear stiffness ball bearing in both static and dynamic modes in order to define the introduction of defects characteristics in to ...

INTRODUCTION. Designing a machine capable of performing its task efficiently, reducing the use of energy, sizing it appropriately and considerably reducing the dynamic stress resulting from the impact to avoid fatigue failures, represents an important challenge (Ocampo et al., 2015).The structural integrity of a mill can be rapidly degraded due to …

The dynamic support stiffness (DSS) of assembled bearings in high-speed motorized spindles (HSMSs) is the main factor affecting the rotor's operating stiffness which, in turn, directly affects the machining accuracy of HSMSs. This paper establishes a thermo-mechanical coupled quasi-static model of the DSS of assembled bearings, …

Analysis of dynamic stiffness characteristics of RAMB for MSMP. Figure 1 shows the magnetically suspended molecular pump model, mainly composed of a single rotor shaft, two RAMBs, an axial active ...

The elastic deformation of rolling mill elements during the rolling process is important. By knowing the displacement of rolls, the optimum gap between the work rolls can be calculated. In present research, a vibration model with two degrees of freedom is proposed for a cold sheet rolling mill and the stiffness parameters of different mill …

Reading Time: 6 minutes The last article published on KOT's Blog covered concepts such as: ODS, accelerometry, modal analysis and ressonance. Introduction The need for mills in various mining processes is evident to professionals in the field of work, especially for grinding systems. This article will present one of Kot's successful cases, …

Abstract and Figures Ball mills are widely used in mining, agriculture, and cement industries. There is little information on the design of such equipment from a …

In this study, based on ball–raceway Hertz point contact theory, mathematical models of the static and dynamic stiffnesses of angular contact ball bearings are …

To obtain the dynamic stiffness, the test strategy for dynamic stiffness of the angular con-tact ball bearings is introduced. The experimental results show that the …

Bearing stiffness, as one of the most important service characteristics for ball bearing, plays a crucial role in the bearing design and rotor dynamic analysis. To …

The calculation results provide a reference for the improvement of the ball mill foundation. ... is the stiffness of the system, ... T. Study on Charge Dynamic Behaviour of Ball Mills.

Download scientific diagram | Stiffness and Damping Parameters for Piles. from publication: Coal Mill Foundation – A Finite Element Approach for Study of Dynamic Analysis | Dynamic Analysis and ...

The stiffness of the rolling bearing has a great influence on the dynamic characteristics of motorized spindle. In order to obtain the stiffness of angular contact ball bearing under oil-jet lubrication, the theoretical calculation model and …