The Noise Control Engineering Journal (NCEJ) 

Vol. 73, Issue 2, 2025 – Just released  Noise Control Engineering Journal – Institute of Noise Control Engineering  Here are two examples selected from the 10 papers in this issue. 

Experimental study on the influence of hole parameters on vibration response of spur gear pair with damping particles 

Thi Thanh Hai-Tran1, Trong-Thuan Luu1a 

₁ School of Mechanical Engineering, Hanoi University of Science and Technology https://doi.org/10.3397/1/377310 

CONCLUSION 

This study experimentally investigated the influence of the geometrical parametric of the technology hole, which contains the damping particles, on the radial vibration of the system gearbox. The experimental apparatus was set up with several groups of spur gear pairs, where the hole dimension, position, and quantity were modified to evaluate the radial vibration response of the gearbox system. 

According to the experimental analysis in the examples, the hole’s diameter, the radius of the hole center, and the hole number significantly impact the radial acceleration RMS value. The vibrating response can 

be improved in comparison with the impact of the original design by 71.58% in case of changing the hole diameter, 67.37% in case of changing the radius of the hole center, and 73.87% in case of changing the hole number. However, the optimal value for these parameters should be further analyzed along with other parameters, such as the filling rate and the rotational speed. 

Test method for evaluating the NIOSH Noise Mapper application in a hemi-anechoic chamber 

Lincan Yan₁, Jonathan Hrica₂, Yousef Elmashae₂, David Yantek₂ 

₁ Pittsburgh Mining Research Division, National Institute of Occupational Safety and Health Division of Office of Mine Safety and Health Research (NIOSH), ₂ Pittsburgh Mining Research Division, National Institute of Occupational Safety and Health (NIOSH) https://doi.org/10.3397/1/37739

Conclusions 

In conclusion, the NIOSH Noise Mapper Application shows promise as a tool for assessing noise exposure and preventing occupational hearing loss. Further validation studies in diverse workplace settings with a wide variety of sound fields and user evaluations are warranted to fully evaluate the app’s effectiveness and usability in practical occupational safety and health applications.