In this paper two different visco-elastic suspensions active system with pneumatic cylinder, and semi-active system with piezoceramics, are presented. The active suspension controls the vibration in mediumamplitude range and low frequency excitation. The semi-active suppression system controls the vibration in the audio frequency range and small amplitudes. The main aim of proposed solutions is to decrease the amplitude of vibration in resonance of conventional, passive suspensions. Both systems are worked out, especially for the better protection of the human body against harmful sounds and vibrations. By means of the active pneumatic actuator presented in the paper it is possible to improve vibro-isolating properties of suspension system in the frequency range of 0-5 Hz. For higher frequency range, vibro-properties of both seats (passive and active) are nearly the same. Applying the active pneumatic system decreases the rms acceleration of vibro-isolating body by about 40 % in comparison with passive one. At the same time, the rms relative displacement of suspension with the use of an active actuator is reduced by about 15 %. The presented connecting of multi-loops control strategy and pneumatic driving improves the vibro-isolation systems significantly. Such a solution is proposed especially for suspensions, which often work at medium amplitudes and low frequency range. The damping system with piezoceramics allows to influence the mechanical system in an audio frequency range. For the piezo vibration control it was possible to improve significantly the damping performance involving the semi-active impedance shunt. Although there exist many limitations concerning the negative capacitance circuit hardware, its efficiency is very promising. Additionally, the complexity of the negative capacitance circuit is neglible in comparison with the pure active solutions. The limitations apply mainly to the voltage and the current safe operational area, which is covered by an operational amplifier. In the tested system, the power supply requirements for the negative impedance converter observed during the measurements did not exceed significantly the requirements covered by its idle statethe energy dissipated in the internal electronics of the operational amplifier.


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    Titel :

    Active control of vibration in small and medium amplitude range of elements in automotive systems


    Weitere Titelangaben:

    Aktive Schwingungsregelung für Automobilsysteme im Bereich kleiner und mittlerer Amplituden


    Beteiligte:


    Erscheinungsdatum :

    2009


    Format / Umfang :

    8 Seiten, 5 Bilder, 18 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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