Noise Measurement Services provides acoustical consultancy services in the assessment, management and control of environmental and workplace noise. Our site-specific reports present sound level measurements recorded and analysed, discuss the noise criteria to be achieved, identify noise mitigation measures and recommends options to achieve the required design criteria. Noise management plans can be developed for industrial activities where different levels of compliance may be required over time.
Projects undertaken requiring noise monitoring and assessment include:
Noise monitoring, modelling and assessment are key parts of every report to illustrate immediate and long-term effects of noise on the development. NMS staff are fully trained to gather relevant information about the site, the effect of noise on the development and how the development may affect its neighbours.
Reporting includes, building construction assessment to the Building Code of Australia and the requirements of ‘Queensland Development Code Mandatory Part 4.4 – Buildings in Transport Noise Corridors’. The Code provides requirements for new houses, townhouses, units, hotel and motels as well as renovations for residences near main roads.
A typical noise monitoring program provides continuous monitoring of sound levels and is ideally suited to short- or long-term monitoring. Data is processed using software to obtain results over daily, weekly, monthly and even annual periods together with numerical tables, time history and spectrograms of Leq and Ln.
The Sound Level Meter is used as a measurement front-end receiving, for example, the Leq and 1/3rd octave data every second. Reports are typically produced as 10 min, 1 hour, 1 day, 1 week or 1-month updates that can be published to a website and/or emailed to designated recipients.
Monitoring of noise is achieved with a range of instruments including:
Remote telemetry Larson Davis systems are employed as necessary for long-term monitoring and have in-built calibration and solar power. Audio recording is standard with the Larson Davis 831. Noise Tutor and DNA analysis programs are available for logging and reporting data.
Occupational noise and vibration assessments are undertaken with Cirrus dosebadges for noise and the Norsonic NOR-136 6-channel vibration meter for hand-arm and whole-body vibration.
The NoiseLab Professional 4 sound recording and analysis program from Delta provides computer-based sound recording for sound measurement, tonality and sound quality analysis.
Studio Six Digital sound recording apps and hardware are available for use with Apple smartphones and tablets. Typical applications are in environmental and personal sound exposure, spectrum analysis and speaker systems applications.
Building code certification is undertaken with Class 1 sound level meters and a Norsonic tapping machine.
Our site-specific report discusses noise criteria to be achieved, identifies noise mitigation measures and recommends options to achieve required design criteria.
NMS applies standard prediction techniques under ISO9613-2, CONCAWE and BS5228 Parts 1 and 2, for assessment of noise to relevant noise management legislation, guidelines and codes of practice. Prediction calculations are undertaken with PEN3D, SoundPLAN, and standard analysis protocols.
The predictions are based on ‘most-likely’ placement of plant and equipment to give a representative assessment for different plant and activities operating in different locations and for varying times of day or night. Both single point and noise contour calculations are used to determine the noise level at noise sensitive premises.
Noise contours show the range of noise levels in the locality due to the operation of the mine and plant. Refinement may be made this model through collection of reliable sound power level data, modelling for variable source locations, topographic (barrier) effects and meteorological conditions. Night-time levels can be higher due to atmospheric conditions of temperature inversion, so detailed weather data would be of great assistance in modelling different weather based scenarios.