Abstract:At the Institute of Machine Elements, Gears, and Transmission (MEGT, University of Kaiserslautern) a spherical roller bearing has been modeled in an multi body system (MBS) environment. The use of the commercial MBS (multi-body system) software (MSC ADAMS) allows the development of user-written subroutines for contact recognition and the calculation of contact forces. Those subroutines can help understanding the principles of friction phenomena inside spherical roller bearings, while the measurement of those e… Show more
“…Adams and self-written user routines. These simulation models have been verified experimentally through several research works [18][19][20][21][22]. Figure 2 gives an overview of the model structure of rolling Fig.…”
Section: Modeling Setup For Wear Simulationmentioning
Cage not only separates the rolling elements but play an essential role of lubricant supplier in solid lubricated rolling bearings, thereby lubricating the rolling contacts. In such bearings, whose service life can be significantly extended by targeted cage wear, a better understanding and a reliable prediction of the wear is necessary in order to achieve a further increase in the service life. In order to predict wear and eventually their life-time is a complex phenomenon as it involves several transfer processes taking place in the rolling and sliding contacts. The lifespan of such bearings can be determined by performing numerous lifetime experiments. Global lifetime model for solid-lubricated rolling bearings does not exist so far like a conventional bearing life model. Therefore, a dynamic simulation strategy based on Adams multibody simulation environment to predict and model wear at cage pocket interface have been proposed. An incremental wear simulation approach based on Fleischer wear law is introduced. Uniform global wear of the cage pocket depending on the recalculation of cage geometry and converted frictional energy for each wear increment is calculated. Simulation results show good accordance with the experimental results. The importance and suitability of such a wear simulation approach will be enunciated in this paper.
“…Adams and self-written user routines. These simulation models have been verified experimentally through several research works [18][19][20][21][22]. Figure 2 gives an overview of the model structure of rolling Fig.…”
Section: Modeling Setup For Wear Simulationmentioning
Cage not only separates the rolling elements but play an essential role of lubricant supplier in solid lubricated rolling bearings, thereby lubricating the rolling contacts. In such bearings, whose service life can be significantly extended by targeted cage wear, a better understanding and a reliable prediction of the wear is necessary in order to achieve a further increase in the service life. In order to predict wear and eventually their life-time is a complex phenomenon as it involves several transfer processes taking place in the rolling and sliding contacts. The lifespan of such bearings can be determined by performing numerous lifetime experiments. Global lifetime model for solid-lubricated rolling bearings does not exist so far like a conventional bearing life model. Therefore, a dynamic simulation strategy based on Adams multibody simulation environment to predict and model wear at cage pocket interface have been proposed. An incremental wear simulation approach based on Fleischer wear law is introduced. Uniform global wear of the cage pocket depending on the recalculation of cage geometry and converted frictional energy for each wear increment is calculated. Simulation results show good accordance with the experimental results. The importance and suitability of such a wear simulation approach will be enunciated in this paper.
“…In equations (13) to (15), D rightÀiÀloaded , D rightÀi , ini , s , rightÀiÀtot , ; rightÀi , d aÀmis , d rÀmis , P d , d iX , and d iY denote the loaded and initial distances between the ith roller and the inner ring, initial contact angle, SAC angle, the total contact angle and position angle of the right-row ith roller, the axial component and radial component of the centroidal misalignment, the radial clearance, the axial and radial elastic deformations, respectively. It is noted that the parameters s , d aÀmis , d rÀmis , and ; i are variables, which value or direction is changing with the ith roller rolling.…”
Section: Force Analysis Of Single Rollermentioning
confidence: 99%
“…With the simulation technique developing, it was practical to establish an SRB model by commercial software. 13 Figure 1.Schematic diagram of a spherical roller bearing.…”
Section: Introductionmentioning
confidence: 99%
“…With the simulation technique developing, it was practical to establish an SRB model by commercial software. 13 In this paper, the misalignments between the inner and outer rings (misalignments for short) are mainly classified into two types, namely angular misalignment and centroidal misalignment, as shown in Figure 2 Although SRBs inherent self-aligning ability can automatically balance the angular misalignment to a certain degree, it is lack of thorough theoretical foundation. Besides, these two kinds of misalignments can both considerably change SRBs characteristics.…”
This research presents a theoretical model to analyze the mechanical performance of spherical roller bearings, taking account of the angular and centroidal misalignments between the inner and outer rings. The angular misalignment can be improved by spherical roller bearings self-aligning feature to a certain degree. The interpolation method is used to determine the self-aligning contact angles of the different rollers. The centroidal misalignment is described by the angular and distance deviations. Non-Hertzian contact theory is applied to model and calculate the rollers load-distribution and total contact angles as well as the displacement of the inner ring. The loads of the rollers with the misalignments features and the external loads are included in the equilibrium equations, which is solved by Newton-Raphson method. This research shows spherical roller bearings self-aligning ability can balance the additional bending moment caused by the angular misalignment, which is at the cost of reducing its carrying capacity. But this carrying capacity will be improved to a certain degree by a proper axial load. It also illustrates that any kinds of centroidal misalignments are harmful for the service life of bearings. But the location of the misalignments can be roughly inferred by the external loads and the displacement of the inner ring, which is helpful for spherical roller bearings fault diagnose and elimination.
“…Benson and Hallquist [11] presented a contact algorithm in FEM and showed how to calculate the contact force included the friction. Fiedler et al [12] used a user written subroutine for contact recognition. Zhao et al [13] gave finite element formations and iteration processes for static and dynamic contact problems.…”
Friction is present in most mechanical systems. The aim of this paper is to analyse friction between a pneumatic cylinder and its piston seal using the finite element method (FEM
Keywords
Friction, finite element method (FEM), pneumatic cylinder, hyperelastic material model
IntroductionFor industrial automation speed and reliability with simple construction and effortless maintenance are the most wanted properties. These demands can be ensured by pneumatic actuators. These devices transform pneumatic energy into linear motion. This paper examines a double acting pneumatic cylinder (Fig. 1). The compressed air enters into the tube and moves the piston in both extend and retract strokes. The pressure p 2 on the piston imparted by the air creates the driving force F. The double acting cylinders are used when the driving force is important in both directions. The seals in cylinders are o-rings or membranes. Studying the factors affecting the piston motion are important for the control. Friction has a high priority, because this nonlinear factor causes the difficulty of the exact location / velocity control.
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