Unai Galfarsoro

• Doctor of Engineering
• MGEP

The vibration of the stator frame due to electromagnetic forces is one of the main noise and vibration sources of electric machines. In some applications, due to the wide variety of working conditions, design optimizations are not enough, and the control of the machine is needed to reduce vibrations. Therefore, this work presents a reduced mod...

Eccentricity is an inevitable fault in electric motors and hence its diagnosis is an important topic. Thus, the influence of static and dynamic eccentricities on the harmonics of the frequency spectra of the unbalanced magnetic pull is analyzed. In this study, dimensional tolerances of the rotor and the stator are also considered. All parts have di...

The ropes of an elevator transmit the vibrations from the motor to the elevator car, and consequently have a great influence on comfort. Therefore, it is of major interest to analyse the dynamic behaviour of these elements, in order to know the mechanical properties of them. These ropes are composed of metallic wires and covered by a polymeric mate...

The noise of Heating, Ventilating and Air Conditioning (HVAC) systems is an important aspect to take into account when the comfort of the users is compromised. For instance, passengers in trains perceive this noise, which influences the perception of the quality of the travel. Therefore, solutions to attenuate that noise need to be proposed and app...

There are several fault types that may arise in electric motors decreasing both reliability and comfort. Eccentricity is one of the main faults, and therefore, tools are needed to detect the motors that do not fulfil the quality requirements. This paper proposes a methodology based on a novel experimental test bench to assess both static and dynami...

Brake - Clutches exhibit in several cases undesirable high frequency noise phenomena. The nature of this noise it is assumed to be similar to the squeal produced in transports. In the state of the art hundreds of references can be found in order to study and solve squeal problems in different ways of transport like auto motion, railways or plain...

Drill wears dictates the tool replacement in drilling. An effort is made in this paper to determine this geometric wear criterion through online monitoring. For this purpose, vibration, force, torque and temperature signals were monitored over a period of time for a drilling operation and these signals were analyzed in time and frequency domains to...

Nowadays the use of coaches as ground collective transport is generalizing in society and besides, its use is encouraged by all public institutions. Users of this type of vehicles request that they are comfortable, even more in long trips. Therefore, decreasing noise and vibrations inside the coach is a essential requirement to obtain a good qualit...