A free fall shaft shock excitation device

Abstract

The invention discloses a free fall shaft impact excitation device, which comprises a main portal frame, an excitation mass block, an excitation hammer head and a lifting part; the main portal frame spans above the rail to be tested, and the rail includes Steel rails on both sides; the beam of the main gantry is provided with a guide shaft extending vertically to the direction of the steel rail below, the excitation mass is slidably connected to the guide column, and the vibration excitation on the left and right sides The mass blocks are fixedly connected by a horizontal axis; the vibration-exciting hammerhead is arranged at the bottom of the vibration-exciting mass block, and the height of the vibration-exciting hammerhead can be adjusted in the vertical direction; one end of the lifting part is connected to the The cross beam of the main mast is connected, and the other end is connected with the cross shaft. After adopting the above structure, the vibration-exciting hammer head can simultaneously excite the rails on both sides, and when there is a height difference between the rails on both sides, the synchronization of the vibration can be ensured by adjusting the height of the vibration-exciting hammer head.

Description

technical field [0001] The invention relates to a vibration excitation device for testing the dynamic characteristics and damping performance of a track structure. More specifically, it relates to a free fall shaft shock excitation device. Background technique [0002] With the speed-up of my country's railways and the development of urban rail transit, more and more new track structures have been put into practical use. In order to master the dynamic characteristics of the new track structure and new track components, it is one of the very important means to test the track dynamic characteristics and vibration damping performance in the laboratory. [0003] The existing laboratory track dynamic vibration excitation equipment can be divided into three categories: (1) frequency sweep excitation equipment based on a single excitation frequency; The wheel set implements double-track impact excitation. The disadvantage of the first type of equipment is that the excitation fre...

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Problems solved by technology

The disadvantage of the first type of equipment is that the excitation frequency is single and discontinuous. If it is necessary to understand the dynamic characteristics of the track structure in all frequency bands of interest, the test workload is huge, and it is easy to miss some key frequency data. Moreover, this type of equipment mainly focuses on Low-frequency excitation is powerless for medium and high-frequency excitation; the disadvantage of the second type of equipment is that the excitation load is small, and it can only excite a single rail, and cannot fully detect the dynamic characteristics of the track structure as a whole; the third The disadvantage of this kind of equipment is that the excitation force cannot be directly tested, and the excitation mass is single, and the excitation force can only be changed by adjusting the drop height. In addition, the time synchronization of the double-track excitation is poor

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