Tilting-pad journal bearings are widely used in industry to support rotating shafts due their high dynamic performance. The operating limits of these mainly represented by the maximum permissible temperature lined materials pads and minimum thickness oil-film under which mixed lubrication can occur. current trend bearing development sees adoption innovative production pads, that provide higher ...

Compartmentalization of Ca(2+) between dendritic spines and shafts is governed by diffusion barriers and a range of Ca(2+) extrusion mechanisms. The distinct contribution of different Ca(2+) clearance systems to Ca(2+) compartmentalization in dendritic spines versus shafts remains elusive. We applied a combination of ultrastructural and functional imaging methods to assess the subcellular distr...

Wear resistance of dynamic system components is a major challenge in aeronautics. According the usage aircraft, off-centred loads can appear on shafts when rotating bodies are unbalanced. In literature, most wear studies applied to plain bearing consider static centred contact area. This article presents study submitted order look for better mastering service life their severe aeronautic condit...

This paper presents analytical and numerical studies on the active assignment of poles to a planetary gear system for vibration control in order avoid resonance. involves feeding back displacement velocity add stiffness damping, respectively. A rotating frame reference has been adopted describe dynamics over broad range rotational speed. As an illustration, closed loop were assigned translation...

The diagnosis of cracks in rotating shafts using non-destructive techniques provides a route for avoiding catastrophic failure of these common components. This study measured the dynamic response of a full-scale rotating shaft with three different crack depths. A novel non-destructive system is developed and described. The system uses vertical vibration of the system measured over time and char...

Structural faults, such as unbalance, misalignment and looseness, etc., often occur in the shafts of rotating machinery. These faults may cause serious machine accidents and lead to great production losses. This paper proposes an intelligent method for diagnosing structural faults of rotating machinery using ant colony optimization (ACO) and relative ratio symptom parameters (RRSPs) in order to...

Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and ax...

Two methods for estimating the mechanical parameters of a rotating drive system that can be treated as a resonant 3-inertia system, are proposed. The accuracy of the estimation results is sufficient in order to design a state controller, which damps both resonances actively. Synopsis The mechanics of rotating drive systems normally consist of several inertias, which are joined together by elast...

A finite element based method is presented for evaluation of linearized dynamic equations of flexible mechanisms about a nominal trajectory. The coefficient matrices of the linearized equations of motion are evaluated as explicit analytical expressions involving mixed sets of generalized co-ordinates of the mechanism with rigid links and deformation mode co-ordinates that characterize deformati...