The Influence of Hydrothermal Aging on the Dynamic Friction Model of Rubber Seals

Wu, Jian; Luo, Hang; Li, Haohao; Su, Benlong; Wang, Youshan; Li, Zhe

doi:10.3390/polym12010102

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…In practical applications, Yao et al 19 used the LuGre model and Li et al 20 used a modified continuous LuGre model to modify the adaptive control performance of hydraulic actuators. Wu et al 21 further modified the friction-velocity model by considering the hydrothermal aging effect.…”

Section: F I G U R Ementioning

confidence: 99%

Identification of system parameters of a large‐scale dynamic multiaxial testing facility

Lin,

Yu,

Lin

et al. 2024

Earthq Engng Struct Dyn

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Large‐scale multiaxial testing facilities mainly serve to experimentally examine the horizontal behavior of full‐scale critical structural members, such as columns and seismic isolation bearings, on which a large vertical compression load is exerted as they simultaneously undergo horizontal deformation. The system friction and inertia force play an important role in obtaining sufficiently reliable test results, and it is not easy to comprehensively grasp all the issues involved. To understand the system friction and inertia force of the Bi‐Axial Dynamic Testing System (BATS) at the National Center for Research on Earthquake Engineering Tainan laboratory and to avoid complexity caused by specimens as much as possible, a lubricated flat sliding bearing is chosen as the specimen to be tested under horizontal triangular and sinusoidal reversed loading together with a constant vertical compression load. When no specimens are installed, that is, without vertical compression loading, the system friction of BATS generated by the various sliding surfaces can be identified and mathematically characterized using the horizontal triangular reversed loading test results; then, the effective mass of BATS can be estimated using the horizontal sinusoidal reversal loading test results to solve the inertia force problem. When applying a vertical compression load, it is assumed that the system friction of BATS and the shear force of the specimen are simply related to the applied total normal force (or vertical compression load) and horizontal excitation rate. An iteration methodology is proposed to identify and mathematically describe the dependency of the friction performance of BATS and the specimen on total normal forces (or vertical compression loads) and horizontal excitation rates by iterating the horizontal triangular and sinusoidal reversed loading test results. Finally, a lead‐rubber bearing and a direct force measurement system are connected in series such that the measurement system precludes the system friction and inertia force and a series of tests are conducted. The reliability of the proposed mathematical model for BATS and the feasibility of the proposed direct force measurement strategy are further demonstrated by comparing the calibrated force response with the directly measured response.

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Section: F I G U R Ementioning

confidence: 99%

Identification of system parameters of a large‐scale dynamic multiaxial testing facility

Lin,

Yu,

Lin

et al. 2024

Earthq Engng Struct Dyn

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“…The contact parameters of the ANN input are derived from a positive pressure (Hunt–Crossley) model and a friction (LuGre) model, which are caused by the load and driving torque qw of walking wheel and describe the influence of relative contact indentation, normal velocity and tangential velocity on the contact force. These contact models appear to be the most accepted in the scientific community being the most widely used, and here we list the Hunt–Crossley 25–27 and LuGre 28–30 formulas (1) and (2) only where Fn is the normal contact force, K is the contact-stiffness parameter, χ=3(1-cr)K/2crδ·0 is the hysteresis damping factor which is intended for use in a contact between softer materials that have a smaller coefficient of restitution cr, and more elastic contacts with higher values of energy dissipation. These types of contact properties can be found in wheel-cable coupling; δ·0 is the initial relative contact velocity in the normal direction.…”

Section: Contact Estimatormentioning

confidence: 99%

Rigid–flexible coupling dynamics with contact estimator for robot/PTL system

Zheng

Jiang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part K:

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In order to enhance sampling efficiency and security when robot maintains power transmission line (PTL), this article develops a new approach for the rigid-flexible coupling dynamics of robot/PTL system, which decouples the large system into two small systems and solves them separately by estimating the contact force. The robot is modelled as a system of rigid bodies by screw theory, while the PTL system is modelled using absolute node coordinate formulation (ANCF). The integration of screw theory, ANCF and contact estimator trained by artificial neural network has not been accomplished before in the literature. The main contribution of this paper is to achieve this integration with the goal of developing a new and general approach for the nonlinear dynamic analysis of the interaction of the rigid maintenance robot with flexible PTL cable. A simplified two-dimensional example is used to compute the effect of the robot/PTL interaction under different operating conditions to have an understanding of the coupling approach between the two systems. A more detailed three-dimensional model was developed, and the results obtained validate the utility and effectiveness of our approach.

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“…Efficiently reducing the friction and wear of dynamic rubber seals can greatly prevent leakage, maintain gas pressure, and exclude dirt, thereby benefiting to energy conservation and environmental protection [1][2][3]. Considerable methods have been devoted to optimize the friction performance of dynamic rubber seals.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the tribological performance of DLC-coated NBR rubber: The role of hydrogen in films

Chun

Zhang

et al. 2021

Friction

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Diamond-like carbon (DLC) films directly deposited on rubber substrate is undoubtedly one optimal option to improve the tribological properties due to its ultralow friction, high-hardness as well as good chemical compatibility with rubber. Investigating the relationship between film structure and tribological performance is vital for protecting rubber. In this study it was demonstrated that the etching effect induced by hydrogen incorporation played positive roles in reducing surface roughness of DLC films. In addition, the water contact angle (CA) of DLC-coated nitrile butadiene rubber (NBR) was sensitive to the surface energy and sp2 carbon clustering of DLC films. Most importantly, the optimum tribological performance was obtained at the 29 at% H-containing DLC film coated on NBR, which mainly depended on the following key factors: (1) the DLC film with appropriate roughness matched the counterpart surface; (2) the contact area and surface energy controlled interface adhesive force; (3) the microstructure of DLC films impacted load-bearing capacity; and (4) the generation of graphitic phase acted as a solid lubricant. This understanding may draw inspiration for the fabrication of DLC films on rubber to achieve low friction coefficient.

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The Influence of Hydrothermal Aging on the Dynamic Friction Model of Rubber Seals

Cited by 6 publications

References 20 publications

Identification of system parameters of a large‐scale dynamic multiaxial testing facility

Identification of system parameters of a large‐scale dynamic multiaxial testing facility

Rigid–flexible coupling dynamics with contact estimator for robot/PTL system

Optimizing the tribological performance of DLC-coated NBR rubber: The role of hydrogen in films

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