A construction quality problem detection method based on frequency response function

Abstract

The invention discloses a detection method for a construction quality problem based on frequency response functions, and relates to the technical field of mechanical vibration. The detection method comprises the steps of determining a to-be-detected area which possibly has a construction quality problem on an object to be evaluated; applying the same excitation on the object to be evaluated and aqualified construction object so as to enable the object to be evaluated and the qualified construction object to vibrate, respectively obtaining vibration frequency response functions of an originalpoint and at least one cross point, and calculating a band root mean square of the ratio of the vibration frequency response functions of the original point and each cross point, wherein each cross point is connected with the original point on which the excitation acts through the to-be-detected area; and judging the object to be evaluated to have a construction quality problem if the difference of the band root mean squares of the objet to be evaluated and the qualified construction object is greater than a set threshold. The detection method effectively reduces human factor influences brought about by excitation and data analysis applied by different operators, enables the analysis result to be high in repeatability and consistency, is simple in data analysis and can be used for judgingsmall construction quality problems.

Description

technical field [0001] The invention relates to the technical field of mechanical vibration, in particular to a method for detecting construction quality problems based on a frequency response function. Background technique [0002] In the process of ship construction, it is necessary to detect and identify certain construction quality problems of the ship structure itself and its surface (such as welding defect inspection, composite material pasting quality inspection, and structural connection strength inspection, etc.). At present, the detection of construction quality problems mostly relies on methods such as hearing and visual inspection, or vibration and noise detection with the help of instruments and equipment. When using the vibration and noise detection method, the frequency response function (Frequency Response Function, FRF) curve of the external excitation is first obtained at the position where there is a construction quality problem, but then when the data is ...

AI Technical Summary

Problems solved by technology

In the above-mentioned conventional vibration and noise detection methods, not only the test results are affected by human factors brought about by the incentives imposed by different operators, but also the data processing method relies too much on the engineering experience of the data analysts

Therefore, it is generally believed that the error of conventional testing and data analysis methods is about 1dB, and in some cases it can reach 2dB. As a result, conventional vibration and noise detection methods can only identify large construction quality problems, but are not enough for subtle construction quality problems Sensitive, it is difficult to judge whether it is measurement and analysis errors or construction quality problems, which makes the consistency of analysis results poor, the evaluation conclusions on construction quality problems are not uniform, and the engineering application value is low

Images