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Subjective Evaluation of Environment Noise in Classrooms
YANG Qing-lei
   2012, 32 (2): 88-90.   DOI: 10.3969/j.issn.1006-1355-2012.02.021
Abstract （1396）            Save
With the development of collegiate ecosystem campus, quality of acoustic environment in teaching area is extensively concerned. Taking a campus of a university in Qingdao as an example, the noise characters in the teaching area were analyzed, and some representative teaching areas were selected according to the characteristics of noise source distribution. Through the noise monitoring in the teaching areas, student’s questionnaire investigation of noises in classrooms, and the analysis of the information of student’s subjective response by means of fuzzy mathematics, the noise threshold based on comfort sense in the teaching areas were determined. Finally, according to the characteristics of noise source distribution and the noise threshold, some measures for improving acoustic environment in the teaching areas of campus were proposed.
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《Study on Noise Suppressing Performance of Constrained Layer Damping Structure》
YANG Qing;WANG Xin;ZHANG Wenwei;Zhu Jie
   2010, 30 (4): 150-152.   DOI: 10.3969/j.issn.1006-1355.2010.04.038
Abstract （1971）            Save
Constrained layer damping, as one type of the surface damping methods, is usually applied to solve the vibration and noise problems of metal plate structures. The loss factor and storage modulus of the damping material are usually used to evaluate the damping performance of the material. But this method can not be employed to evaluate the vibration and noise control performance of the constrained layer damping effectively and directly. In this paper, a new method is introduced to solve this problem. In this method, sinusoidal scanning is adopted and the vibration of a simply supported beam is excited by the quasiwhite noise random vibration. Through the analysis of the response, the vibration and noise control effect of the constrained layer damping is expressed.
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