A review on empirical mode decomposition in fault diagnosis of rotating machinery

This note presents a modification of the integrated friction model structure proposed by Swevers et al. (2000), called the Leuven model. The Leuven model structure allows accurate modeling both in the presliding and the sliding regimes without the use of a switching function. The model incorporates a hysteresis function with nonlocal memory and arbitrary transition curves. This note presents two modifications of the Leuven model. A first modification overcomes a recently detected shortcoming of the original Leuven model: a discontinuity in the friction force which occurs during certain transitions in presliding. A second modification, using the general Maxwell slip model to implement the hysteresis force, eliminates the problem of stack overflow, which can occur with the implementation of the hysteresis force.

Technical Note: modification of the Leuven integrated friction model structure

Experimental investigation and neural network prediction of brakes and clutch material frictional behaviour considering the sliding acceleration influence

A study of the dynamic characteristics of a wire rope vibration isolation system constructed with helical isolators is presented. Emphasis is placed on the analytical modeling of damping mechanisms in the system. An experimental investigation is described in which the static stiffness curve, hysteresis curves, phase trajectories, and frequency response curves were obtained. A semi-empirical model having nonlinear stiffness, nth-power velocity damping, and variable Coulomb friction damping is developed and results are compared to experimental data. Conclusions about dynamic phenomena in the wire rope system are made based on the experimental and semi-empirical results.

Damping phenomena in a wire rope vibration isolation system

The impact of fretting wear on structural dynamics: Experiment and Simulation

Application of EMD method to friction signal processing

In this paper, based on experimental results, a new non-reversible friction model is proposed. The model has the capability to include both hysteresis in the presliding regime and velocity hysteresis (frictional memory effect or frictional lag) in the sliding regime. In this model, a differential function, which varies between −1 and +1 and has the characters of the Bouc–Wen model, is used to take the place of a sign function. This solution smoothes the transition from presliding to sliding and the hysteresis in the presliding regime can be described. In the sliding regime, this model has the form of a combination of a general velocity-dependent model with another acceleration-dependent part. This form allows a good description of velocity hysteresis in the sliding regime. The parameter identification procedure for this new model is also presented in this paper. The simulation results show the practicability and accuracy of the model in describing friction force both in the presliding and the sliding regimes.

Non-reversible friction modeling and identification

In the design and manufacture of elevator systems, the slide guide in elevators moves in contact against the guide rail. This kind of surface contact exhibits a highly non-linear hysteretic friction behaviour, which hampers the riding quality of the elevator systems to a great extent. First, this paper presents an experimental investigation on this type of phenomenon through the measurement of contact friction force between the interface of the slide guide and the rail under different combinations of input parameters. The experiment clearly shows various types of fric- tional behaviour, including presliding/gross-sliding regimes, the transition behaviour between them, friction overshoot, time lag, velocity (weakening and strengthening) dependence, etc. In addition, it is found that for different materials in contact, lubrication conditions and friction duration have strong impacts on the evaluation of their friction characteristics. Based on the observations of this test, an improved friction model derived from the Bouc-Wen model is then proposed and compared with other friction models. The Bouc-Wen model is improved by adding elements considering the velocity dependence and friction overshoot. The numerical simula- tions show that the proposed model can capture the behaviour found in the experiments, agrees with the experimental data reasonably well, and may be used for the dynamical analysis of the elevator systems.

A new friction model for the slide guide in elevator systems: Experimental and theoretical investigations

This paper proposed a new dynamical friction model structure which allows accurate modeling both in sliding and presliding regimes. Transition between these two regimes is accomplished without a switching function. In the presliding regime, the model has the characters of a Bouc–Wen model, so it can adapt to various hysteretic behaviors. While in the gross-sliding regime, the model is equivalent to a general velocity-dependent friction model. Therefore, the dynamical characters of friction force in this regime, such as negative friction-velocity slope, can be described also. Furthermore, the transition between these two regimes is not abrupt, but smooth, and needs no extra function. The application of this model is demonstrated by describing experimentally obtained friction force for a guide–rail system. Numerical simulation results for a vibration system with friction show the practicability of the model to predict dynamic characteristics such as hysteretic behavior in presliding, velocity-dependent behavior in sliding, and stick-slip behavior.

a New Dynamical Friction Model

The slide guide in an elevator moves in contact against the guide rail. This kind of surface contact exhibits a highly non-linear hysteretic friction behaviour which hampers greatly the riding quality of the elevator system. This paper presents an experimental investigation on this type of phenomenon through measuring the contact friction force between the interface of the slide guide and the rail under different combination of input parameters. The experiment shows frictional behaviours including pre-sliding/gross-sliding regimes, transition behaviour between them, time lag, and velocity (weakening and strengthening) dependence. In addition, it is found that different materials in contact, lubrications and friction duration have strong impacts on evaluation of the friction characteristics. The observations in the test provide an insight into relationships between different friction behaviours and can be used to validate the appropriate theoretical friction models.

https://iopscience.iop.org/article/10.1088/1742-6596/96/1/012074/pdf

Xingang Zhang

Papers

Application of EMD method to friction signal processing

Non-reversible friction modeling and identification

A new friction model for the slide guide in elevator systems: Experimental and theoretical investigations

a New Dynamical Friction Model

Effect of friction on the slide guide in an elevator system