Noise is unwanted sound. It has a physical and social problem with several undesirable effects:
- Cause hearing loss.
- Causes annoyance resulting in sleep disturbance, stress, tension, loss of performance.
- Interferes with activities such as speech communication.
Noise is measured in units called decibels (dB). Noise of less than 75 decibels, even after a lengthy exposure, is unlikely to cause hearing loss. However extended or repeated exposure to noise at or above 85 decibels (approximately the level of a vacuum cleaner) can cause hearing loss. In Western Australia 85 dB(A) is legally the maximum acceptable exposure level at the workplace.
Noise can be controlled in following three catalogues:
- Sources;
- Noise propagation path; and
- Receivers.
In general, noise control measures can be applied to any and all of the above three aspects. The most cost effective treatment in a given situation depends on the particulars of the system. In some systems, it is easiest to attack the source. Where this is not possible or feasible, attention shifts to blocking or attenuating the path of noise transmission. In some situations, the only feasible solution might be to remove the receiver (people) or force them to wear hearing protectors.
In general, it is most effective (least costly) to implement noise control in the design stage. To immunize noise emissions and compliance with regulations, it is necessary during the design stage to have:
- Proper analysis or modeling;
- Experimental studies if necessary; and
- Engage with qualified acoustic consultants.
Acoustic Engineering Solutions (AES) provides a wide range of noise testing and control services including sound power and intensity measurements in accordance with relevant Regulations, Australian and International Standards. AES has experience in analysis, prediction, testing and control of noises. Our services include but not limited to:
- Noise testing/monitoring
- Commissioning testing
- Vehicle noise tests
- Noise data analysis
- Onsite event noise monitoring
- Sound power measurement
- Sound intensity measurement
- Noise source identification
- Ground-borne vibration measurement
Sound power and intensity measurements are very challenging. Apart from the instrumentation requirements, the operator must be experienced in the measurement techniques and has the experimental and analytical skills to minimise the measurement errors.
Sound power and intensity measurements are one of the AES strengths. Our consultants have extensive research and consulting experience in the measurement techniques, experimental and analytical skills for different types of equipment. We have many-year site measurement experience in using different engineering methods and have developed a method for measuring sound power levels of driving trucks.
For more information, please contact:
enquiries@acousticengsolutions.com.au
Or visit AES website:
www.acousticengsolutions.com.au