Method and system for testing dynamic stiffness

Abstract

The invention relates to the field of traffic rails and specifically relates to a method and a system for testing dynamic stiffness. The method for testing the dynamic stiffness includes that a force in a preset frequency range is applied to a rail in preset time to enable the rail to produce vibration; force signals and vibratory acceleration signals are real-timely acquired according to a preset sampling frequency; data of the force F, time corresponding to the force F, data of an acceleration a and time corresponding to the acceleration a are recorded according to preset time intervals, the acquired force signals and the acquired acceleration signals; a corresponding relation of a displacement X and the frequency f is obtained according to the corresponding relation of the data of the acceleration a and the time corresponding to the acceleration a; the corresponding relation of the displacement X and the time t is obtained; and the corresponding relation of the dynamic stiffness Z and the frequency f is obtained according to the corresponding relations and the corresponding relation of the dynamic stiffness, the displacement and the force, and namely, wide frequency dynamic stiffness is obtained. By means of the method and the system for testing the dynamic stiffness, the wide frequency dynamic stiffness of the rail can be tested.

Description

technical field [0001] The invention relates to the field of traffic tracks, in particular to a method and system for testing dynamic stiffness. Background technique [0002] As an important part of the railway line, the track is an integral engineering structure, generally composed of steel rails, sleepers, fasteners and ballast beds. As a very important means of transportation in modern society, its safety is closely related to people's lives. The safety evaluation index of track mainly includes static stiffness and dynamic stiffness. [0003] Track dynamic stiffness is an important parameter used to characterize the relationship between the excited vibration force of the rail surface and the deformation after the excited vibration force under dynamic conditions, that is, the ability to resist alternating loads, and its value represents the structural dynamic characteristics of the track . It is numerically equal to the alternating force required for unit amplitude, tha...

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Problems solved by technology

[0006] Since the fatigue machine can only apply force at a certain fixed frequency, the obtained dynamic stiffness is also the dynamic stiffness at a ce

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