| 摘要 |
A dynamic damper device of a front roof rail in a vehicle is provided to increase weight of a damper mass by measuring characteristic frequency of a vehicle body with an acceleration sensor when the traveling vehicle bumps. A dynamic damper device of a front roof rail(10) in a vehicle comprises a housing(11), a spring passage(14), a variable damper mass(15). The housing, which is attached to the front roof rail, contains steel powders(13). The spring passage communicates with the housing with a predetermined strength. The variable damper mass communicates with the spring passage, and attracts the steel powders to increase weight of the damper mass. The variable damper mass includes a damper mass, an electromagnet(16), and a controller(18). The damper mass, which is hollow, is communicated with the spring passage. The electromagnet is installed inside the damper mass. The controller transmits control signals to the electromagnet. An acceleration sensor(17) is connected to the controller to detect vibration of the vehicle body. The controller transmits the control signals, corresponding to vibration signals output by the acceleration sensor, to the electromagnet.
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