scholarly journals Performance transmission loss and the ‘‘high low’’ rating method for predicting and measuring sound resistance of walls, ceilings, and floors

1993 ◽  
Vol 93 (4) ◽  
pp. 2342-2342
Author(s):  
Tom Paige
Keyword(s):  
Transmission Loss ◽  
Rating Method

Modern Approaches to the Teaching of Risk Scienceat a University

2020 ◽  
Vol 17 (5) ◽  
pp. 94-110
Author(s):  
V. V. Gamukin
Keyword(s):  
Rating Scale ◽  
Human Life ◽  
Risk Identification ◽  
Individual Risk ◽  
Professional Activities ◽  
Basic Competencies ◽  
Internal Rating ◽  
Rating Method ◽  
Intuitive Method ◽  
Numeric Rating

Purpose. Disclosure of the peculiarities of the organization of modern training of university students with a risky perception of reality in order to form basic competencies for future professional activities.Methods. As part of the study, the following were used: the systematization method, the structural analysis method and the numeric rating method.Results. The peculiarities of riskology training in the construction of an individual educational route are determined, in which the possibility of students independently choosing disciplines to realize their own interests in various fields of knowledge is used. Methods of obtaining risk identification skills from trainees are formulated. It is determined that using the intuitive method of risk formalization is the most accessible and expeditious way to remember the possibility of risks. The need to develop a sustainable habit of assessing risks in the future and in fact is justified. This skill is successfully developed using a numeric rating method. The need to develop an internal rating scale for each student is justified, which is useful for making decisions. Disclosed is a method of assimilating risk analysis skills in dynamics. This allows you to identify the development of forecast estimates in comparison with the fact for each individual risk and compile several risks.Conclusion. An educational experiment on the introduction of the Riskology discipline for students ofTyumenStateUniversity suggests that they have successfully overcome the stage of high risk of perception of reality that arose during the COVID-19 pandemic. The acquired knowledge and practical skills will ensure a similar perception of other events in their lives and professional activities. It is necessary to fully expand such practices and find an opportunity to supplement educational programs in universities, regardless of their orientation, with disciplines that directly reveal the nature of risk in human life and give them the ability to manage them.

Effect of leakage and blockage on the acoustic behavior of particle filters

2019 ◽  
Vol 67 (6) ◽  
pp. 483-492
Author(s):  
Seonghyeon Baek ◽  
Iljae Lee
Keyword(s):  
Transfer Matrix ◽  
Particle Filters ◽  
Acoustic Analysis ◽  
Transmission Loss ◽  
One Dimensional ◽  
Filter System ◽  
The Difference ◽  
The One ◽  
Analytical Approaches ◽  
Good Agreement

The effects of leakage and blockage on the acoustic performance of particle filters have been examined by using one-dimensional acoustic analysis and experimental methods. First, the transfer matrix of a filter system connected to inlet and outlet pipes with conical sections is measured using a two-load method. Then, the transfer matrix of a particle filter only is extracted from the experiments by applying inverse matrices of the conical sections. In the analytical approaches, the one-dimensional acoustic model for the leakage between the filter and the housing is developed. The predicted transmission loss shows a good agreement with the experimental results. Compared to the baseline, the leakage between the filter and housing increases transmission loss at a certain frequency and its harmonics. In addition, the transmission loss for the system with a partially blocked filter is measured. The blockage of the filter also increases the transmission loss at higher frequencies. For the simplicity of experiments to identify the leakage and blockage, the reflection coefficients at the inlet of the filter system have been measured using two different downstream conditions: open pipe and highly absorptive terminations. The experiments show that with highly absorptive terminations, it is easier to see the difference between the baseline and the defects.

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