A low frequency mass tuning vibration damping device and its adjustment method
A mass-tuning and vibration-damping device technology, applied to bridge parts, bridges, buildings, etc., can solve the problems of difficult to design shock absorbers, low vertical controlled vibration modal frequency, and large static deformation of cylindrical helical compression springs and other issues to achieve the effect of convenient adjustment
Active Publication Date: 2015-08-19
中铁桥研科技有限公司 +2
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Problems solved by technology
For long-span bridges, the frequencies corresponding to the main vertically controlled vibration modes are relatively low. According to the above-mentioned conventional design methods, due to the large static deformation of the cylindrical helical compression springs, the clearance in the steel box girder structure is limited. Under the circumstances, it is difficult to design a shock absorber that meets the requirements
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0031] like figure 1 and figure 2 As shown, a low frequency mass tuning vibration damping device includes a support 1, a rotating shaft 2, a worm gear mechanism 3, a lever 6, a frequency adjustment spring 7, a damper 8, a mass block 9 and at least one pair of spring mechanisms, the The rotating shaft 2 is erected on the support 1, and the rotating shaft 2 is vertically connected to a lever 6 through a bearing, and the lever 6 can rotate around the rotating shaft 2. One end of the lever 6 is provided with a mass 9, the center of gravity of the mass 9 is on the axis of the lever 6, the position of the mass 9 on the lever 6 is adjustable, and the frequency adjustment spring 7 and the damper 8 are respectively The lever 6 and the support 1 are connected, and both are arranged between the spring mechanism and the mass block 9 . Each pair of spr...
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The invention provides a low-frequency mass tuning and vibration-damping device and a regulating method for the same, and relates to the field of vibration control on large-span bridge structures. A rotating shaft rack is arranged on a support; a rotating shaft is perpendicularly connected with a lever through a bearing; a mass block is arranged at one end of the lever; a frequency regulating spring and a damper are respectively connected with the lever and the support; each pair of spring mechanisms is sleeved on the rotating shaft and is symmetrically arranged on two sides of the lever; the turning direction of a far-end flat spiral spring of each spring mechanism is the same with that of a near-end flat spiral spring of the spring mechanism; the far-end flat spiral spring and the near-end flat spiral spring of each spring mechanism are parallel to each other; and a worm gear and worm mechanism is arranged at one end of the rotating shaft. The worm gear and worm mechanism rotates, and the position of the frequency regulating spring is changed, so that the frequency of the low-frequency mass tuning and vibration-damping device is a set value. By using the low-frequency mass tuning and vibration-damping device and the regulating method for the same, vibration control on a large-span bridge with low controlled frequency can be realized.
Description
technical field [0001] The invention relates to the field of vibration control of long-span bridge structures, in particular to a low-frequency mass-tuned vibration damping device and an adjustment method thereof. Background technique [0002] With the continuous construction of cross-sea bridges in my country, long-span bridges with steel box girder structures are prone to vortex-induced vibrations at low wind speeds. Due to its high frequency and large amplitude, it is enough to affect driving safety. Therefore, it is of great practical significance to limit the vibration amplitude of vortex-induced vibration to an acceptable range or avoid vortex-induced vibration. [0003] At present, the commonly used vibration damping device is to adjust the frequency of the device itself to make it resonate with the main structure, and transfer most of the vibration of the main structure to the vibration of the mass block of the tuned mass damper. At the same time, through the energy ...
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IPC IPC(8): E01D19/00
Inventor 汪正兴王波田启贤童智洋柴小鹏王翔尹红刘鹏飞荆国强伊建军王艳芬张华兵李裕生
Owner 中铁桥研科技有限公司