Free wheel load drop vibration excitation device

Abstract

The invention discloses a free wheel load drop vibration excitation device, including a main portal, vibration excitation mass blocks, vibration excitation hammers and a hoisting component, wherein the main portal is spanned over a rail to be tested, and the rail includes steel rails on left and right sides; a guide shaft vertically extending to the steel rail direction on the lower side is arranged on a cross beam of the main portal, the vibration excitation mass block is connected with a guide pillar in a sliding manner, and the vibration excitation mass blocks on the left and right sides are fixedly connected by a cross shaft; the vibration excitation hammers are arranged at the bottoms of the vibration excitation mass blocks, and the heights of the vibration excitation hammers are adjustable in vertical direction; one end of the hoisting component is connected with the cross beam of the main portal while the other end is connected with the cross shaft. After adopting the above structure, the vibration excitation hammers can perform vibration excitation on the steel rails on the two sides synchronously, and when the steel rails on the two sides have a height difference, the synchronism of vibration excitation can be ensured by adjusting the heights of the vibration excitation hammers.

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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