Noise pollution

About: Noise pollution is a research topic. Over the lifetime, 4455 publications have been published within this topic receiving 67192 citations.

NASA Glenn's Contributions to Aircraft Engine Noise Research

Abstract: This report reviews all engine noise research conducted at the NASA Glenn Research Center over the past 70 years. This report includes a historical perspective of the Center and the facilities used to conduct the research. Major noise research programs are highlighted to show their impact on industry and on the development of aircraft noise reduction technology. Noise reduction trends are discussed, and future aircraft concepts are presented. Since the 1960s, research results show that the average perceived noise level has been reduced by about 20 decibels (dB). Studies also show that, depending on the size of the airport, the aircraft fleet mix, and the actual growth in air travel, another 15 to 17 dB reduction will be required to achieve NASA's long-term goal of providing technologies to limit objectionable noise to the boundaries of an average airport.

The life of a New York City noise sensor network

Abstract: Noise pollution is one of the topmost quality of life issues for urban residents in the United States. Continued exposure to high levels of noise has proven effects on health, including acute effects such as sleep disruption, and long-term effects such as hypertension, heart disease, and hearing loss. To investigate and ultimately aid in the mitigation of urban noise, a network of 55 sensor nodes has been deployed across New York City for over two years, collecting sound pressure level (SPL) and audio data. This network has cumulatively amassed over 75 years of calibrated, high-resolution SPL measurements and 35 years of audio data. In addition, high frequency telemetry data has been collected that provides an indication of a sensors' health. This telemetry data was analyzed over an 18 month period across 31 of the sensors. It has been used to develop a prototype model for pre-failure detection which has the ability to identify sensors in a prefail state 69.1% of the time. The entire network infrastructure is outlined, including the operation of the sensors, followed by an analysis of its data yield and the development of the fault detection approach and the future system integration plans for this.

The Effects of Noise Pollution and Hearing of Metal Workers in Arak

Abstract: Background: Noise exposure and subsequent hearing loss are important problems in metal industry. The aim of this study was to determine the prevalence of noise induced hearing loss (NIHL) and other risk factors associated with industrial noise exposure among metal workers in a metal factory in Arak. Materials and Methods: In this cross-sectional study, 743 metal workers who were exposed to noise were involved. The environment noise was measured using both sound level meter according to standards presented by national association of occupational health of Iran and ACGIH and ANSI. Audiometry was used to assess the hearing loss in each worker according to ISO-85 standard. Results: Of 1191 station points that sound pressure level was measured there, 224 points (18%) were above the permissible level of 85 dB. In 967 points (82%), sound pressure level was in precaution range (65

Crew noise exposure on board ships and comparative study of applicable standards

Abstract: In recent years, transport activities have radically increased due to globalisation, growth in wealth and freedom of movement. The shipping industry has responded to increased needs by providing flexible operations using new types of ships, equipped with novel technologies, materials and propulsion systems. Furthermore, services have been extended to new geographical areas including locations in and around populated cities. Naturally such services, in addition to the benefits, create various types of problems including noise pollution. This issue has been addressed at the European as well as the IMO (International Maritime Organization) level with the introduction of new/revised standards and limitations on noise. These statutory standards are also applicable to ships for the well-being of crew, commuters, as well as residents living around ship passageways and harbours. This paper focuses on the welfare and performance of seagoing crew working in various locations in the ships. Noise measurements carried...