The bearing vibration signal is a rich dynamic symptom of wear, and the rolling presents chaotic characteristics. Input output variables can be constructed through phase space reconstruction, imported into prediction model for prediction. accuracy extreme learning machine (ELM) model, Kriging RBF are compared, results show that ELM has higher accuracy, so chaos used to predict future time serie...

The influence of the dynamic wear model considering tooth contact flash temperature on characteristics a gear-bearing system is studied. Firstly, meshing stiffness model, based theory, established. Then, changing surface and in process gear analyzed. Next, initial calculated Archard Finally, effects wear, friction factors, damping ratio response are results show that with increase fractal dimen...

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The Inverse Frobenius-Perron problem (IFPP) concerns the creation of discrete chaotic mappings with arbitrary invariant densities. In this note, we present a new and elegant solution to the IFPP, based on positive matrix theory. Our method allows chaotic maps with arbitrary piecewise-constant invariant densities, and with arbitrary mixing properties, to be synthesized.

I review the local theory of mixing, which focuses on infinitesimal blobs of scalar being advected and stretched by a random velocity field. An advantage of this theory is that it provides elegant analytical results. A disadvantage is that it is highly idealised. Nevertheless, it provides insight into the mechanism of chaotic mixing and the effect of random fluctuations on the rate of decay of ...

The extent of chaos and the suppressory role of Coulomb repulsion in the chaotic dynamics associated with nonsteady finite-amplitude electroconvection is revisited in the context of dynamical systems. Specifically, it is theoretically demonstrated that the threshold value of the charge density taming the heteroclinic chaos associated with laminar chaotic mixing depends on the sinusoidal perturb...

vibration generated by vehicles during road transport has an important impact on agricultural products' damage process, particularly in the case of fruits and vegetables. modulus of elasticity is one of the most conspicuous mechanical properties of fruits, the variation in which can be described as one of the most affecting damage criteria during transportation. this research was conducted...

Instability in intact condition occurs when a ship’s motion changes periodically with time i.e. frequency of will match free- roll or multiples. In case damage stability, the instability due to flood water sloshing, series vibration occur along free surface effect, which metacentric height ship. Mathieu's effect is linear theory behind instability. Probabilistic stability analysis performed cas...

the purpose of this study was to assess exposure to hand-arm vibration in tiller users, forty users of tiller in northeastern provinces of iran were examined to measure hand-arm vibration parameters such as root mean square acceleration (rms), total equivalent acceleration, vibration dose value (vdv) and crest factor in three directions (x, y, and z) and various operating modes for comparing th...