Tahsin Doguer

APL GmbH · Engineering

From the perspective of legislative requirements on combustion engines in regards to exhaust emissions, CO2-efficiency as well as higher specific loads from downsizing measures, friction reduction is especially important. Wear can over time affect the performance of components which for instance is likely to have a negative effect on the emission r...

The simulation of small, local faults on arbitrary bearing components was presented in previous papers by the authors, in which a self-written multi-body-simulation-program for rolling element bearings with transient contact algorithm was used. Such faults can appear in vehicle wheel bearings in the form of pitting or false brinelling. In the simul...

The analysis of vibration signals is a major technique for monitoring the condition of machine components. A focus of this paper is given to the early detection of very small bearing damages like false brinelling faults, which occur in the presence of a small relative motion between the rollers and raceways during non-rotation times. This leads to...

In condition monitoring of rotating machinery vibration analysis is commonly used for fault detection. Often bearing faults appear as wear, indentation and spalling, which result from foreign particles, overload, inadequate lubrication or vibration while metal to metal contact. For the life time estimation of the bearing the early detection of faul...

The main focus of this paper is given to the detection of different fault types in the inner or outer race of roller bearing. The first group covers faults with an extension beyond the spacing between two rolling elements. In these cases some of the classical methods like envelop techniques could fail. We show that the vibration structure generated...

Im diesem Beitrag werden Ansätze skizziert, wie sich Mehrkörperdynamikprogramme (MKS), die bisher in erster Linie zur Vorausberechnung von dynamischen Systemen in der konstruktiven Auslegungsphase zum Einsatz kamen, auch für Zwecke der theoretischen Betrachtung von Diagnoseprobleme genutzt werden können. MKS Systeme erlauben heute neben der Verbind...

Classical roller bearing faults detection methods may fail if the shaft speed of the rotor is very high. Laboratory centrifuges or high speed pumps with rotational speeds higher than 20000 rpm typical devices where such problem could occur. Features derived from the signal structure of typical single faults in the outer or inner race (envelop techn...

Simulation of small, local faults on arbitrary bearing components was presented in previous papers, in which a self written multi-body-simulation-program for rolling element bearings with transient contact algorithm was used. Such faults can appear in vehicle wheel bearings in form of pitting or false brinelling. In the simulation the bearing compo...

Rolling element bearings are vital to many rotating machines. The main aspect in condition monitoring of rotating machinery is fault detection. Early detection of faults is essential for the life time estimation. Vibrational signals contain the response information of a bearing due to the fact that they are directly related to contact forces, which...