Periodical impulse component is one of typical fault characteristics in vibration signals from rotating machinery. However, this component is very small in the early stage of the fault and masked by various noises such as gear meshing components modulated by shaft frequency, which make it difficult to extract accurately for fault detection. The adaptive line enhancer (ALE) is an effective techn...

A comprehensive benchmarking study has been carried out to determine the influence of mesh formulation and chip separation methods on reliability accuracy finite element modelling large diameter drilling operations. The Coupled Eulerian–Lagrangian updated-Lagrangian (with deletion) formulations available in ABAQUS/Explicit, together with re-meshing) DEFORM 3D are compared by simulating through-...

Creating an appropriate mesh is one of demanding tasks of many global illumination algorithms. Discontinuity meshing proved to diminish artifacts caused by other meshing strategies. Since naive discontinuity meshing would produce a great amount of geometric computations, accelerating techniques are usually involved. In this paper, we present results obtained with help of k-discrete orientation ...

The tooth surface 3d modification technology is the most effective method to realize reduction of vibration and noise gear system (GS) by comprehensively considering profile axial modification. Moreover, nonlinear factors such as backlash bearing clearance will make motion GS have complex variability. Therefore, we combine with contact performance dynamic characteristics optimize meshing herrin...

Gear box dynamics is characterised by a periodically changing stiffness. In real gear systems, a backlash also exists that can lead to a loss in contact between the teeth. Due to this loss of contact the gear has piecewise linear stiffness characteristics, and the gears can vibrate regularly and chaotically. In this paper we examine the effect of tooth shape imperfections and defects. Using sta...

Abstract. The 3K planetary gear system is a basic transmission structure with many advantages over the 2K-H system. However, vibration characteristics will be more complicated due to increase of central gears meshing each planet simultaneously. In this paper, lumped-parameter model for 3K-II set was developed simulate dynamic response. time-varying stiffness pair different tooth root crack faul...

Abstract. The dynamic load-sharing characteristics of aircraft face gear dual-power split transmission system (FGDPSTS) are taken as the research object. Considering factors time-varying meshing stiffness, comprehensive error, backlash, support clearance, spline torsional and model was constructed based on lumped-parameter method. loaded tooth contact analysis (LTCA) simulation method used to c...