Publication Search

Penelitian ini bertujuan untuk mengkaji dampak penutupan perlintasan kereta api Alastuo terhadap peningkatan volume kendaraan dan intensitas kebisingan di kawasan Fly Over Bangetayu, Kota Semarang. Fenomena ini mencerminkan tantangan tata kelola lalu lintas urban akibat perubahan infrastruktur transportasi. Dengan menggunakan pendekatan kualitatif deskriptif, studi ini dilakukan melalui metode studi kasus di lokasi terdampak. Data dikumpulkan melalui wawancara semi-terstruktur, observasi partisipatif, dokumentasi visual, serta pengukuran intensitas kebisingan menggunakan sound level meter pada sembilan titik waktu berbeda selama tiga hari pengamatan. Partisipan meliputi warga sekitar, pengguna jalan, dan petugas lalu lintas. Hasil analisis tematik menunjukkan adanya korelasi positif antara peningkatan volume kendaraan dan intensitas kebisingan, dengan nilai puncak kebisingan mencapai 93,6 dB pada sore hari. Temuan ini menegaskan bahwa perubahan rute akibat intervensi kebijakan infrastruktur dapat menyebabkan beban akustik yang signifikan di jalur alternatif. Penelitian ini memberikan kontribusi pada pemahaman tentang relasi spasial antara kebijakan lalu lintas dan degradasi lingkungan akustik. Implikasi teoretis mengarah pada integrasi studi kebisingan dalam perencanaan transportasi berkelanjutan, sementara implikasi praktis mencakup kebutuhan akan pengaturan lalu lintas yang adaptif serta mitigasi kebisingan melalui vegetasi, jalur alternatif, dan edukasi berkendara. Penelitian lanjutan disarankan melibatkan pendekatan interdisipliner untuk mengevaluasi dampak kebisingan terhadap kesehatan masyarakat secara langsung.

An exhaust pipe is a tubular device used to channel combustion gases from a vehicle’s engine into the environment. In addition to this primary function, the exhaust also serves to reduce the noise level produced by engine combustion. The component of the exhaust system that significantly affects torque, brake mean effective pressure (BMEP), and noise level is the silencer. This study aims to compare the torque, BMEP, and noise levels produced by variations in the length and construction dimensions of elliptical filter designs in the silencer. The silencers used in this research have lengths of 280 mm, 300 mm, and 260 mm, with short ellipse filter diameters of 25 mm and long ellipse filter diameters of 30 mm, 40 mm, and 50 mm. The research employs an experimental quantitative method, and the data were analyzed using one-way Analysis of Variance (ANOVA). The experiment was conducted in a Mechanical Engineering workshop using a Yamaha R15 V3 155cc injection motorcycle (2021), a Super Dyno 50L dyno test, and a sound level meter, from February to April 2024. The engine speeds tested were 1500, 2500, 3500, 4500, 5500, and 6500 rpm. The results show that the variation of ellipse dimensions 25 mm × 50 mm × 260 mm produced a maximum torque of 12.77 N·m at 4500 rpm, a maximum BMEP of 1021 kPa at 4500 rpm, and a noise level of 80.3 dB. The variation 25 mm × 40 mm × 300 mm produced a maximum torque of 12.88 N·m, a BMEP of 1042 kPa, and a noise level of 75.60 dB, while the variation 25 mm × 30 mm × 280 mm produced a maximum torque of 12.67 N·m, a BMEP of 1013 kPa, and a noise level of 75.63 dB.

Noise is a physical hazard in the work environment that caan reduce hearing loss, especially in the rubber processing industry. The research aims to describe the noise level and control efforts in the production area of PT. Karet XYZ Palembang City in 2025. This study uses a descriptive design with a cross-sectional approach.  Data were collected through direct noise level measurements using sound level meters at wet and dry production areas by taking 8 measurements and questionnaires on 75 selected purposive sampling workers.  Data analysis was carried out univariately. It shows that most of the measurement points have a noise level above the threshold value of 85 dBA in accordance with the Regulation of the Minister of Health of the Republic of Indonesia Number 70 of 2016. The highest values were recorded in the Hummer Mill engine (89,76 dBA) and the Cooling Tunnel (89,70 dBA). All respondents were exposed to noise for ≥8 hours/day. Noise control has been carried out with administrative techniques and the use of personal protective equipment (PPE) but has not been fully effective from the complaints of 7 workers regarding suboptimal protection. The noise level at PT. Karet XYZ and duration of exposure exceeding threshold values that increase the risk to workers health. It is necessary to increase the effectiveness of noise control with a technical, administrative approach and monitoring the optimal use of personal protective equipment (PPE).

The purpose of this study was to analyze the relationship between noise levels and work stress among employees at Karunia Kasih Hospital. This study used a cross-sectional design with a population consisting of all employees in the Front Office, Polyclinic Nurses, and Specialist Doctors. The study sample consisted of 80 respondents selected using total sampling technique. Noise levels were measured using a Sound Level Meter, while work-related stress was assessed using a questionnaire. Data analysis was conducted using the chi-square test with a significance level of α = 0.05. The measurement results indicated that 80% of the work areas had noise levels exceeding the NAB 65 dBA threshold. The Outpatient Corridor area had the highest noise level (83 dBA). A total of 65% of workers experienced moderate to severe work-related stress. There was a significant relationship between noise levels and work-related stress (p-value = 0.001). Age (p-value = 0.024) and length of service (p-value = 0.037) also showed a significant relationship with work-related stress. There is a significant relationship between noise levels and work-related stress among workers at Karunia Kasih Hospital. Efforts to control noise levels and comprehensive stress management programs are needed to protect worker health.

Automatic transmission motorcycles, especially those with 110cc engines, are increasingly in demand by the public because of their practicality. The performance of this motorcycle is greatly influenced by the transmission system, especially the Drive pulley and Roller components. The correct setting of the Drive pulley angle and Roller mass can improve engine performance and reduce noise, thus supporting driving comfort. This study aims to analyze the effect of variations in the Drive pulley angle and Roller mass on engine performance, in terms of power (HP), torque (Nm), and noise level (dB) at several engine speeds. The variations tested include the Drive pulley angle of 13.5°–14° and the Roller mass of 13–15 grams, with testing at 5000, 6000, 7000, and 8000 RPM. The test results show that the combination of the angle and Roller mass affects engine performance. At 5000 RPM, the combination of the 14° angle and 15 gram Roller produces the highest power, torque, and noise. At 6000 RPM, the combination of 13.8° and 13 grams produces a maximum power of 6.86 HP and 8.15 Nm of torque, with a noise of 97.40 dB. While at 7000–8000 RPM, the combination of 13.5° and 15 grams provides the best performance with 7.10 HP and 6.30 Nm of torque, accompanied by a noise of 104.17 dB. In general, increasing the angle and mass of the Roller increases performance, but is followed by an increase in noise.

Noise generated by Diesel Power Plants (PLTD) is a significant environmental problem, especially in urban areas and settlements adjacent to power plant facilities. This study analyzes the noise level around the Fakfak Cotton Plant and its impact on the local community. This study uses a combination of methods, including noise level measurements using a Sound Level Meter (SLM), field observations, interviews with the community, and a SWOT analysis to evaluate the strengths, weaknesses, opportunities, and threats in noise mitigation. The measurement results show that the noise level generated exceeds the threshold of 55 dBA set by the Decree of the Minister of Environment Number 48 of 1996 for residential areas. This condition has a negative impact on the comfort, health, and social interaction of the community around the PLTD location, causing sleep disturbances, stress, and decreased quality of life. The SWOT analysis shows that although the PLTD has advantages in terms of sustainable operations and professional workers, the main weaknesses lie in the lack of soundproofing and the absence of regular noise evaluations. However, there is a great opportunity in the application of noise mitigation technologies, such as the installation of soundproofing, the use of acoustic walls, and planting vegetation as a sound barrier. In addition, collaboration with local governments and increasing environmental awareness can help manage noise impacts more effectively. The main threats identified include potential social conflicts with surrounding communities, negative health impacts, and changes in environmental policies that can affect PLTD operations. With the right mitigation strategies, such as the application of soundproofing technologies, improved communication with the community, and better integration of environmental policies, the environment around PLTDs can become more comfortable and conducive for the community. This study emphasizes the importance of regulatory and technology-based approaches in managing noise in urban environments, as well as the need for sustainable mitigation measures to maintain the well-being of communities around PLTDs..

Currently, the need for office buildings in the city of Surabaya is increasing along with the development of the economy in the city of Surabaya. PT X plans to contribute to meeting these needs, namely by building an office building in the city of Surabaya. This research was designed to calculate and determine the estimated magnitude of the impact of noise levels resulting from PT X's operational activities. Based on the calculation of the estimated magnitude of the impact, it is known that the noise level at the activity location without any activity is 52.4 dB(A) with a medium environmental quality value category (scale 3) and with operational activities producing a noise level of 67.64 dB(A). with the environmental quality value category being very bad (scale 1), so that the difference in environmental quality value between the noise level with activities and the noise level without activities is 2 (Medium Negative). Meanwhile, the noise level in settlements around the activity location without any activity is 47.8 dB(A) with a medium environmental quality value category (scale 4) and with operational activities producing a noise level of 54.66 dB(A) with the category The environmental quality value is medium (scale 3), so the difference in environmental quality value between the noise level with activities and the noise level without activities is 1 (Small Negative).