Electric locomotives of trains and trams are usually equipped with HVAC (heating, ventilation, and air conditioning) units that are placed on top of the locomotive's roof. These units are used to air-condition the driver's cab of the train or tram and consist of two heat exchangers, a compressor, a condenser fan, and a ventilation fan. These components cause vibrations and noise, often at an annoying level, both on the inside and on the outside of the locomotive. To estimate the potential of active vibration reduction approaches, additional control forces are applied to the compressor by means of an electrodynamic shaker. The aim of the control algorithm is to generate a suitable signal to eliminate the vibrations of the compressor by minimizing the error signal measured by the accelerometer. Since the compressor is powered by an asynchronous machine in a fully enclosed casing, the engine speed is not available as a reference signal for a feed forward system. Therefore, a feedback configuration for the control system was chosen. The control configuration described is able to significantly decrease the vibrations of the compressor.


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    Title :

    Active vibration control applied to a tram HVAC unit


    Contributors:


    Publication date :

    2007


    Size :

    2 Seiten, 5 Bilder, 5 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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