| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress generation of radiation noise by reducing vertical vibration of a surge tank-integrated type intake manifold. SOLUTION: ACIS actuator 2 on which the surge tank-integrated intake manifold 1 is assumed as a mass and a connection part (in an embodiment, a mounting member 20 or the like) of the ACIS actuator 2 to the surge tank-integrated type intake manifold 1 is assumed as a spring. Rigidity (spring constant) of the actuator connection part is adjusted taking the mass of the ACIS actuator 2 into account to make resonance frequency of a vibration system (dynamic damper) comprising the mass and the spring match resonance frequency of the surge tank-integrated type intake manifold. Consequently, resonance vibration level of the surge tank-integrated type intake manifold 1 can be reduced by using the ACIS actuator as a dynamic damper without newly providing a separate single function dynamic damper. COPYRIGHT: (C)2008,JPO&INPIT
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