Techniques for Short-Term Predictions of Atmospheric Noise Levels

1973 ◽  
Vol EMC-15 (1) ◽  
pp. 7-11
Author(s):  
P. Joglekar
Keyword(s):  
Noise Levels ◽  
Short Term ◽  
Atmospheric Noise

Combined effects of short-term noise exposure and hygrothermal conditions on indoor environmental perceptions

2017 ◽  
Vol 27 (8) ◽  
pp. 1119-1133 ◽  
Author(s):  
Wonyoung Yang ◽  
Hyeun Jun Moon ◽  
Myung-Jun Kim
Keyword(s):  
Gender Differences ◽  
Noise Exposure ◽  
Thermal Conditions ◽  
Combined Effects ◽  
Environmental Perceptions ◽  
Noise Levels ◽  
Short Term ◽  
Fan Noise ◽  
Subjective Assessments ◽  
Different Types

Realistic thermal conditions with various humidity levels have been considered to examine the combined effects of noise and thermal conditions on indoor environmental perceptions. Subjective assessments of temperature, humidity and psychoacoustics were conducted with 26 subjects under combined environments of seven thermal conditions (18℃: RH 30, 60%, 24℃: RH 27, 43, 65%, 30℃: RH 30, 60%), two noise types (fan and babble noises) and five noise levels (45, 50, 55, 60 and 65 dBA). Three-minute moderate noise exposure did not affect temperature or humidity sensations. However, the temperature and humidity levels affected loudness, annoyance and acoustic preferences when noise was presented as babble. Fan noise perceptions were found to be independent of thermal conditions. Gender differences were clearly found in terms of thermal and psychoacoustic perceptions. Men were more sensitive to hot sensations than women, and women were more sensitive to arid sensations than men. Women were more sensitive to noise levels than men. Gender differences were also found in terms of different types of noise. Men were found to be significantly less sensitive to fan noise than women. Even though psychoacoustic parameters were affected by indoor thermal conditions, thermal parameters were not affected by short-term moderate noise. The combined effect of various types of noise and temperature is still unclear, and this will be considered in a future larger cohort study.

scholarly journals Impact of Aircraft Noise on Communities Near Belgrade Airport

2021 ◽  
Vol 33 (3) ◽  
pp. 323-335
Author(s):  
Emir Ganić ◽  
Jurica Ivošević ◽  
Bojana Mirković
Keyword(s):  
Background Noise ◽  
Aircraft Noise ◽  
Current Noise ◽  
Noise Levels ◽  
Short Term ◽  
Noise Abatement ◽  
Compatibility Analysis ◽  
Noise Measurements ◽  
Continuous Noise ◽  
The Impact

The aim of this research was to examine the impact of aircraft noise on communities near the Belgrade Airport by conducting short-term noise measurements. Apart from the noise abatement procedure published in the Aeronautical Information Publication for Belgrade Airport, there are still neither publicly available reports of the actual efforts made towards the aircraft noise reduction nor the description of the current noise situation. In order to estimate the current noise situation, eighteen aircraft overflight noise measurements were taken in two settlements in specific sound-sensitive community areas around the Belgrade Airport. The results showed that level differences between background noise and aircraft overflights were higher than 10 dB for each measurement and could be considered significant. Furthermore, preliminary compatibility analysis with acoustic zoning was performed. Average daily noise levels were estimated from these short-term measurements and were compared to legal noise limits for different acoustic zones. The results indicate that in some cases noise levels exceed the legal threshold, which should encourage land use planners to include the issue of Belgrade acoustic zoning on the agenda, but also prompt Belgrade Airport to implement continuous noise and flight tracks monitoring.

scholarly journals A biomimetic accelerometer inspired by the cricket's clavate hair

2014 ◽  
Vol 11 (97) ◽  
pp. 20140438 ◽  
Author(s):  
H. Droogendijk ◽  
M. J. de Boer ◽  
R. G. P. Sanders ◽  
G. J. M. Krijnen
Keyword(s):  
Resonance Frequency ◽  
Microelectromechanical Systems ◽  
Dynamic Range ◽  
Detection Threshold ◽  
Gravitational Acceleration ◽  
Noise Levels ◽  
Short Term ◽  
Directional Response ◽  
System A ◽  
Short Term Adaptation

Crickets use so-called clavate hairs to sense (gravitational) acceleration to obtain information on their orientation. Inspired by this clavate hair system, a one-axis biomimetic accelerometer has been developed and fabricated using surface micromachining and SU-8 lithography. An analytical model is presented for the design of the accelerometer, and guidelines are derived to reduce responsivity due to flow-induced contributions to the accelerometer's output. Measurements show that this microelectromechanical systems (MEMS) hair-based accelerometer has a resonance frequency of 320 Hz, a detection threshold of 0.10 ms −2 and a dynamic range of more than 35 dB. The accelerometer exhibits a clear directional response to external accelerations and a low responsivity to airflow. Further, the accelerometer's physical limits with respect to noise levels are addressed and the possibility for short-term adaptation of the sensor to the environment is discussed.

The plasma cyclic-AMP response to noise in humans and rats—short-term exposure to various noise levels

1988 ◽  
Vol 127 (3) ◽  
pp. 431-439 ◽  
Author(s):  
M. Iwamoto ◽  
H. Dodo ◽  
F. Ishii ◽  
J. Yoneda ◽  
S. Yamazaki ◽  
...  
Keyword(s):  
Cyclic Amp ◽  
Noise Levels ◽  
Short Term ◽  
Short Term Exposure

Work-Related Determinants of Voice Complaints Among School Workers: An Eleven-Month Follow-Up Study

2016 ◽  
Vol 25 (4) ◽  
pp. 590-597 ◽  
Author(s):  
Lady Catherine Cantor Cutiva ◽  
Alex Burdorf
Keyword(s):  
Longitudinal Study ◽  
Odds Ratio ◽  
Physical Work ◽  
Noise Levels ◽  
Short Term ◽  
Related Factors ◽  
High Noise ◽  
Work Related ◽  
Acoustic Conditions

Purpose We determined the natural course of voice complaints among school workers and established the risk factors associated with incidence and chronic voice complaints. Method We conducted a longitudinal study with an 11-month follow-up among 682 school workers. Participants filled out a questionnaire on individual and work-related conditions and the nature and severity of voice complaints. All participants who provided baseline data were contacted in the 11-month follow-up, if they were still working in the school. Short-term environmental measurements of physical work-related factors were conducted during visits at the workplaces. Logistic regression analysis was used to determine associations between work-related factors and voice complaints. Results We found a high occurrence of chronic voice complaints, a low recovery of 22%, and an annual incidence of 44%. A self-reported high noise level at the workplace was associated with the incidence of voice complaints (odds ratio = 2.45). Self-reported poor acoustics in the classroom was associated with chronic voice complaints (odds ratio = 1.76). Conclusions This unique longitudinal study among school workers presented some indications that self-reported high noise levels may contribute to the incidence of voice complaints, whereas self-reported poor acoustic conditions may be an important associated factor of chronic voice complaints.

scholarly journals Assessment of Noise and Associated Health Impacts at Selected Secondary Schools in Ibadan, Nigeria

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
Godson R. E. E. Ana ◽  
Derek G. Shendell ◽  
G. E. Brown ◽  
M. K. C. Sridhar
Keyword(s):  
Cross Sectional Study ◽  
Sound Level ◽  
Initial Assessment ◽  
Traffic Density ◽  
Noise Levels ◽  
Short Term ◽  
Cross Sectional ◽  
School Day ◽  
Physical Attributes ◽  
Ibadan Nigeria

Background. Most schools in Ibadan, Nigeria, are located near major roads (mobile line sources). We conducted an initial assessment of noise levels and adverse noise-related health and learning effects.Methods. For this descriptive, cross-sectional study, four schools were selected randomly from eight participating in overall project. We administered 200 questionnaires, 50 per school, assessing health and learning-related outcomes. Noise levels (A-weighted decibels, dBA) were measured with calibrated sound level meters. Traffic density was assessed for school with the highest measured dBA. Observational checklists assessed noise control parameters and building physical attributes.Results. Short-term, cross-sectional school-day noise levels ranged 68.3–84.7 dBA. Over 60% of respondents reported that vehicular traffic was major source of noise, and over 70% complained being disturbed by noise. Three schools reported tiredness, and one school lack of concentration, as the most prevalent noise-related health problems.Conclusion. Secondary school occupants in Ibadan, Nigeria were potentially affected by exposure to noise from mobile line sources.

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