Nadirah Darus

University of Technology Malaysia

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Zaiton Haron

University of Technology Malaysia

Khairulzan Yahya

University of Technology Malaysia

Zanariah Jahya

University of Technology Malaysia

Nordiana Mashros

University of Technology Malaysia

A. Kassim

University of Technology Malaysia

Muhammad Azril Hezmi

University of Technology Malaysia

Mohd Hanifi Othman

Tun Hussein Onn University of Malaysia

Noor Suhaida Galip

University of Technology Malaysia

Ming Han Lim

Universiti Tunku Abdul Rahman

Herni Halim

Universiti Sains Malaysia

Cooperative Institutions

University of Technology Malaysia

Tun Hussein Onn University of Malaysia

Universiti Sains Malaysia

Newcastle University Medicine Malaysia

Malaysia University of Science and Technology

Universiti Teknologi MARA

University of Kuala Lumpur

Universiti Malaysia Pahang Al-Sultan Abdullah

National University of Malaysia

University of Liverpool

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A PRELIMINARY STUDY OF OCCUPATIONAL NOISE EXPOSURE AMONG LEAF BLOWER AND GRASS CUTTER WORKERS IN PUBLIC UNIVERSITY

Jurnal Teknologi (2015)

Zaiton Haron Nadirah Darus Ming Han Lim Zanariah Jahya Mohamad Fauzi Abdul Hamid

Many occupational noise exposure studies have been conducted in various occupational sectors. However, in Malaysia, there are limited numbers of study on grass cutter workers and there is no study on leaf blower workers. Thus, this preliminary study was conducted to assess both occupational noise exposure among leaf blower and grass cutter workers by measuring occupational noise exposure, determining sound power level of the machines and conducting interview session. A total of 20 workers were selected from a public university as study subjects. Noise dosimeter and sound level meter were used to measure the occupational noise exposure and sound pressure level of all machines in determining their sound power levels respectively. Most of the workers were exposed to daily noise dose and time-weighted average (TWA) noise level which exceed the permissible limits. All machines recorded a high sound power level and several workers showed prevalence symptoms of hearing loss. This preliminary study revealed that most of the workers are exposed to excessive occupational noise exposure and at high risk of acquiring noise-induced hearing loss (NIHL).

Sound level meter

Sound exposure

10.11113/jt.v77.6412

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Citations (4)

The Importance of Acoustic Quality in Classroom

Jurnal Teknologi (2014)

Sogol Sarlati Zaiton Haron Khairulzan Yahya Nadirah Darus N. Dimon

An effective learning process in a classroom with good speech intelligibility requires good acoustic quality. Low acoustic quality may cause frequent speech repetition and consequently leads to several emotional disorders among the students. The purpose of this study is to improve the acoustic quality of the classroom for a better learning process. Two classrooms at Faculty of Civil Engineering, Universiti Teknologi Malaysia have been selected for this study. Reverberation time is the most important factor in acoustics, which was determined using theoretical calculations and simulations. A Dass-21 of self-report questionnaires was used to measure the levels of depression, anxiety, and stress among the students. The results showed that reverberation times of the classrooms were more than 1 second and 34% of the students have suffered from severe and extreme anxiety. The acoustic quality can be improved through the replacement of a painted concrete wall with high sound absorption material made of kenaf fiber in order to ensure reverberation time does not exceed the limit.

Sound Quality

10.11113/jt.v70.3581

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Citations (16)

A case study of acoustic efficiency of existing noise barrier in reducing road traffic noise in school area

IOP Conference Series Earth and Environmental Science (2019)

Zaiton Haron Juliza Jamaludin Nadirah Darus Khairulzan Yahya Zanariah Jahya

The study investigates the effectiveness of existing noise wall barrier installed in a school for shielding noise from heavy traffic. The objectives of this study are to investigate the effect of this barrier on the characteristic of traffic noise spectra, and evaluate its efficiency on broadband noise insertion loss and low frequency noise attenuation. The barrier is of absorptive type with slightly aging condition where small holes and cracks in some places are spotted in both surfaces of wall. The barrier is made of panels of fibre cement mortar infill with absorbent materials with the height is 4m x 0.25m thickness x 132 m length with the distance of the barrier to the highway as main noise source is 17 m. Investigation of the efficiency of barrier started with the determining of noise frequency spectra near the barrier at 0.5m in front of barrier, and 0.5 m and 6m behind the barrier, all at five points along the barrier length. The efficiency of barrier was determined by its insertion loss of broadband noise and attenuation of low frequency in the range 20 to 200 Hz. The results showed that barrier changed the characteristic of traffic noise spectrum. It was found that barrier efficiently achieved insertion loss of 5 dBA or above if the receiver was at distance more than 3.5m behind the wall. At 6m meter behind wall, although the barrier was considered effective but it was failed in reducing the sound pressure level below the World Health Organisation (WHO) permissible limit for school area and attenuating the low frequency noise sufficiently. These results highlighted that the barrier unable to combat the noise disturbance in school playing field area.

Roadway noise

10.1088/1755-1315/220/1/012046

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Citations (6)

Traffic Noise Assessment at Residential Areas in Skudai, Johor

E3S Web of Conferences (2018)

Faridah Sulaiman Nadirah Darus Nordiana Mashros Zaiton Haron Khairulzan Yahya

Vehicles passing by on roadways in residential areas may produce unpleasant traffic noise that affects the residents. This paper presents the traffic noise assessment of three selected residential areas located in Skudai, Johor. The objectives of this study are to evaluate traffic characteristics at selected residential areas, determine related noise indices, and assess impact of traffic noise. Traffic characteristics such as daily traffic volume and vehicle speed were evaluated using automatic traffic counter (ATC). Meanwhile, noise indices like equivalent continuous sound pressure level (L Aeq ), noise level exceeded 10% (L 10 ) and 90% (L 90 ) of measurement time were determined using sound level meter (SLM). Besides that, traffic noise index (T NI ) and noise pollution level (L NP ) were calculated based on the measured noise indices. The results showed an increase in noise level of 60 to 70 dBA maximum due to increase in traffic volume. There was also a significant change in noise level of more than 70 dBA even though average vehicle speed did not vary significantly. Nevertheless, L Aeq , T NI , and L NP values for all sites during daytime were lower than the maximum recommended levels. Thus, residents in the three studied areas were not affected in terms of quality of life and health.

Sound level meter

10.1051/e3sconf/20183402024

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Citations (5)

AIP conference proceedings (2023)

A. A. M. A. Ba-Hutair Abdul Rahim Abdul Hamid A. U. Bah Z. M. Hatem N. Abba

Personality type

10.1063/5.0133076

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Acoustic performance of pineapple leaf fibres bonded with natural rubber latex as a sound absorber

AIP conference proceedings (2023)

Tuan Nurul Farazila Tuan Mat Kahirulzan Yahya Zaiton Haron Nadirah Darus I H Redzuan

10.1063/5.0178488

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Acoustic characteristics of composite board from pineapple leaf fibers and rubber latex

AIP conference proceedings (2023)

A. Kassim Khairulzan Yahya Zaiton Haron Nadirah Darus Tuan Nur Farazila Tuan Mat

10.1063/5.0178463

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Acoustical Performance of Palm Oil Clinker Sand Sound Absorber

IOP Conference Series Materials Science and Engineering (2020)

Zaiton Haron Khairulzan Yahya Noor Suhaida Galip Mohamed Zakaria Zanariah Jahya

Abstract This paper presents the results of a study in which the performance of palm oil clinker (POC) sandas an alternative acoustic material for controlling noise problems was investigated. The specimens were prepared using the basic mortar mixture of cement-to-river sand ratio of 1:4. The five mixtures used in the study containedPOC sand at the amounts of 0%, 25%, 50%, 75% and 100% of the total weight of the sand. Hardened mortar properties of density and compressive strength as well asacousticperformance were measured. The results show that the specimens containing POC sand gave an average noise reduction coefficient of 0.30, which is larger than the corresponding value of 0.25 for the specimens withriver sand only. The combination of 50% POC and 50%river sand achieved the highest sound absorption coefficient of 0.5 at 315 Hz and 0.4 at 1000Hz. It was also found that although POC sand reduced the compressive strength of specimens, the values obtained was still within the strength limit of non-load bearing structures. The findings suggest that POC sand has the potential to be used in the construction of non-structural wall in reducing the noise pollution.

Noise reduction coefficient

10.1088/1757-899x/884/1/012034

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Citations (2)

Disparities in Generated Noise Between Predictions and Measurements from Construction Sites

Springer eBooks (2015)

Zaiton Haron Nadirah Darus Khairulzan Yahya

10.1007/978-981-287-505-1_46

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Exterior Noise Due to Interaction of Tire-Thermoplastic Transverse Rumble Strips

MATEC Web of Conferences (2017)

Zaiton Haron Mohd Hanifi Othman Khairulzan Yahya ‪Mohd Rosli Hainin Kamarudin Ambak

Transverse rumble strips (TRS) are a common choice to reduce vehicle speed and increase driver alertness on roadways. However, there is a potential trade-off using them on rural roadway due to the noise problem created when vehicles go over the strips. The present study investigated the noise level, spectral analysis and the possible noise generation mechanism when the TRS hit by a vehicle. Ten-raised-rumbler (RR) and three-layer-overlapped (TLO) were selected in this study as they have received complaints from the public. Results showed that RR generated relatively higher noise and impulse at low speed, and increased sound level in each octave band. Based on these results, RR may irritate human ears even when the vehicle travels at low speed. It was found that RR increased all noise generation mechanism of tire-pavement interaction whilst for the TLO increased structural resonance, sidewall and surface texture vibration.

Rumble

STRIPS

10.1051/matecconf/201710307016

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