Active control of moving noise source - effect of off-axis source position

Jingnan Guo, Jie Pan, M. Hodgson

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    An optimally arranged multiple-channel active-control system is known to be able to create a large quiet zone in free space for a stationary primary noise source. When the primary noise source moves, the active control of the noise becomes much more difficult, as the primary noise field changes with time in space. In this case, the controller of the control system must respond fast enough to compensate for the change; much research has been focused on this issue. In this paper, it is shown that a moving source also causes difficulties from an acoustical perspective. A moving source not only changes continuously the strengths and phases of the sound field in the space, but also changes the wavefront of the primary sound field continuously. It is known that the efficiency of active noise control is determined mainly by the wavefront matching between the primary and control fields. To keep the control system effective in the case of a moving source, the wavefront of the control field needs to change, in order to continuously match the primary-wavefront change, This paper shows that there are limitations to the control-wavefront change. An optimally pre-arranged, multiple-channel control system is not able to construct a matching wavefront when the primary source moves outside a certain range. In other words, the control system is still able to create a large quiet zone only when the primary source moves within a range around the central axis of the control system. Both the location and the size of the quiet zone change with the location of the primary source. (C) 2002 Elsevier Science Ltd.
    Original languageEnglish
    Pages (from-to)457-475
    JournalJournal of Sound and Vibration
    Volume251
    Issue number3
    DOIs
    Publication statusPublished - 2002

    Fingerprint

    active control
    Wavefronts
    Control systems
    Acoustic fields
    Active noise control
    sound fields
    Controllers
    controllers
    causes

    Cite this

    @article{d291dba8f9a748648b5eacd5777c39b5,
    title = "Active control of moving noise source - effect of off-axis source position",
    abstract = "An optimally arranged multiple-channel active-control system is known to be able to create a large quiet zone in free space for a stationary primary noise source. When the primary noise source moves, the active control of the noise becomes much more difficult, as the primary noise field changes with time in space. In this case, the controller of the control system must respond fast enough to compensate for the change; much research has been focused on this issue. In this paper, it is shown that a moving source also causes difficulties from an acoustical perspective. A moving source not only changes continuously the strengths and phases of the sound field in the space, but also changes the wavefront of the primary sound field continuously. It is known that the efficiency of active noise control is determined mainly by the wavefront matching between the primary and control fields. To keep the control system effective in the case of a moving source, the wavefront of the control field needs to change, in order to continuously match the primary-wavefront change, This paper shows that there are limitations to the control-wavefront change. An optimally pre-arranged, multiple-channel control system is not able to construct a matching wavefront when the primary source moves outside a certain range. In other words, the control system is still able to create a large quiet zone only when the primary source moves within a range around the central axis of the control system. Both the location and the size of the quiet zone change with the location of the primary source. (C) 2002 Elsevier Science Ltd.",
    author = "Jingnan Guo and Jie Pan and M. Hodgson",
    year = "2002",
    doi = "10.1006/jsvi.2001.3994",
    language = "English",
    volume = "251",
    pages = "457--475",
    journal = "Journal Sound and Vibration",
    issn = "0022-460X",
    publisher = "Academic Press",
    number = "3",

    }

    Active control of moving noise source - effect of off-axis source position. / Guo, Jingnan; Pan, Jie; Hodgson, M.

    In: Journal of Sound and Vibration, Vol. 251, No. 3, 2002, p. 457-475.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Active control of moving noise source - effect of off-axis source position

    AU - Guo, Jingnan

    AU - Pan, Jie

    AU - Hodgson, M.

    PY - 2002

    Y1 - 2002

    N2 - An optimally arranged multiple-channel active-control system is known to be able to create a large quiet zone in free space for a stationary primary noise source. When the primary noise source moves, the active control of the noise becomes much more difficult, as the primary noise field changes with time in space. In this case, the controller of the control system must respond fast enough to compensate for the change; much research has been focused on this issue. In this paper, it is shown that a moving source also causes difficulties from an acoustical perspective. A moving source not only changes continuously the strengths and phases of the sound field in the space, but also changes the wavefront of the primary sound field continuously. It is known that the efficiency of active noise control is determined mainly by the wavefront matching between the primary and control fields. To keep the control system effective in the case of a moving source, the wavefront of the control field needs to change, in order to continuously match the primary-wavefront change, This paper shows that there are limitations to the control-wavefront change. An optimally pre-arranged, multiple-channel control system is not able to construct a matching wavefront when the primary source moves outside a certain range. In other words, the control system is still able to create a large quiet zone only when the primary source moves within a range around the central axis of the control system. Both the location and the size of the quiet zone change with the location of the primary source. (C) 2002 Elsevier Science Ltd.

    AB - An optimally arranged multiple-channel active-control system is known to be able to create a large quiet zone in free space for a stationary primary noise source. When the primary noise source moves, the active control of the noise becomes much more difficult, as the primary noise field changes with time in space. In this case, the controller of the control system must respond fast enough to compensate for the change; much research has been focused on this issue. In this paper, it is shown that a moving source also causes difficulties from an acoustical perspective. A moving source not only changes continuously the strengths and phases of the sound field in the space, but also changes the wavefront of the primary sound field continuously. It is known that the efficiency of active noise control is determined mainly by the wavefront matching between the primary and control fields. To keep the control system effective in the case of a moving source, the wavefront of the control field needs to change, in order to continuously match the primary-wavefront change, This paper shows that there are limitations to the control-wavefront change. An optimally pre-arranged, multiple-channel control system is not able to construct a matching wavefront when the primary source moves outside a certain range. In other words, the control system is still able to create a large quiet zone only when the primary source moves within a range around the central axis of the control system. Both the location and the size of the quiet zone change with the location of the primary source. (C) 2002 Elsevier Science Ltd.

    U2 - 10.1006/jsvi.2001.3994

    DO - 10.1006/jsvi.2001.3994

    M3 - Article

    VL - 251

    SP - 457

    EP - 475

    JO - Journal Sound and Vibration

    JF - Journal Sound and Vibration

    SN - 0022-460X

    IS - 3

    ER -