Abstract
A new test method based on sound signals for natural frequencies of steel components was proposed in this paper. The proposed method is a non-contact measurement method which does not need to install any sensors and therefore generates no measurement errors. The method consists of three steps. First, a steel component is placed in suspension state, and the sound signals of this component are collected under artificial excitation by a recording device such as a mobile phone. Second, the collected sound signals are analyzed by the periodogram method to obtain the power spectral density curves. Finally, the first few natural frequencies of the steel component are readily obtained through the power spectral density curves. An I-steel beam was tested in the experiment to verify the proposed method. The first three natural frequencies of this beam can be successfully obtained by the proposed method. For comparison, the values of the first three natural frequencies of this beam were also analyzed by numerical simulations and the traditional modal test method using the acceleration sensors. It has been found that the results obtained by the proposed method only have slight deviations compared with the values obtained by the simulation and the modal test method. Compared with the traditional modal test methods, the proposed method is more economical, fast, and precise to obtain the natural frequencies of steel components. It may be a promising testing method for the natural frequencies of steel components.
Highlights
The natural frequency is the most commonly used parameter of the engineering structure, which can reflect the comprehensive physical properties of the structural system.[1,2] For example, the natural frequency can reflect the damage state of structural components
This paper is organized as follows: The following section presents the theoretical analysis of the natural frequencies of the steel components, which is followed by a section that illustrates the proposed natural frequency test method by using the sound signals
When the distance of sound signal acquisition expanded to 0.3 m from the test component, as shown in Figure 2(b) (D 1⁄4 0.3 m), the power spectral density (PSD) curve depicted in Figure 4(b) could still be clearly located at the peaks for the first three-order natural frequencies of the test component
Summary
The natural frequency is the most commonly used parameter of the engineering structure, which can reflect the comprehensive physical properties of the structural system.[1,2] For example, the natural frequency can reflect the damage state of structural components. This, a new natural frequency test method based on sound signals of steel components is proposed in this paper. This paper is organized as follows: The following section presents the theoretical analysis of the natural frequencies of the steel components, which is followed by a section that illustrates the proposed natural frequency test method by using the sound signals.
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