Frequency-adjustable single-degree-of-freedom pitching motion test system

Abstract

The invention relates to a single-degree-of-freedom pitching motion test system with adjustable frequency. The single-degree-of-freedom pitching motion test system comprises a supporting frame, a rotating platform and a rotating bearing, wherein the supporting frame comprises a first upper frame and a vertical supporting piece which are fixedly connected, the rotating platform comprises a second upper frame and a hanging plate which are fixedly connected, a rotating shaft is sleeved with the middle of the first upper frame, and the top end of the hanging plate is fixed to the rotating shaft and swings along with rotation of the rotating shaft; the two side edges, parallel to the rotating shaft, of the first upper frame and the second upper frame are connected through a plurality of symmetrically-arranged springs. By changing the number and rigidity of the springs and/or the mass of the rotating platform, the rotating rigidity, rotational inertia and natural vibration frequency of the rotating platform can be adjusted. The test system has a rotational degree of freedom, the rotational inertia and the natural vibration frequency of the rotating platform can be conveniently and quickly adjusted so as to adapt to the frequency requirement of the test on the structure, and the test system is easy to install and maintain.

Description

technical field [0001] The invention belongs to the technical field of dynamic testing of civil engineering structures, in particular to a frequency-adjustable single-degree-of-freedom pitching motion testing system. Background technique [0002] With the development of construction technology, structural vibration control has become an important research topic in civil engineering. Modern bridges are designed as long-span, lightweight, flexible, and slender structures with low inherent damping, so they exhibit high dynamic response sensitivity to wind loads. In order to ensure the safety of the bridge structure, appropriate structural control devices are required to suppress the pitching motion of the bridge caused by wind loads. At the same time, some offshore structures, such as offshore floating wind turbines (Floating Wind Turbines, FWTs), also need to conduct corresponding research on pitching vibration control. FWTs are characterized by tall and slender towers, long...

AI Technical Summary

Problems solved by technology

In order to realize the simulation of structural pitching motion, the existing test device platform often requires large-scale, heavy and complex instruments and equipment, and requires precise instrument debugging and operation. The test cost is high and the preparation period is long.

Images