Low-frequency mass tuning and vibration-damping device and regulating method for same

Abstract

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 ...

AI Technical Summary

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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