Noise & Vibration
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The consideration of Noise & Vibrations related impacts is very important in Environmental Impact Assessment. It is important to focus on what are the primary sources of generation of noise as well as vibrations, while conducting the study for Impact on the Noise & Vibrations environment close to the project site. For Every project, Noise Predictive analysis is conducted from the data collected for the list of equipment and machinery for that respective project and quantitative impact is predicted for each of the noise monitoring locations. Mitigations are then suggested by the team of experts available at Kadam Environmental Consultants for reducing the noise levels for respective machinery/equipment.

Noise & Vibrations Lab – Tools & Instruments available at Kadam Consultants

  • Sound Pressure Level meter (Multiple)
  • Integrating Sound Pressure Level meter (Multiple)
  • Sound Plan Essential 3.0
  • Sound FFT Analyzer with CM-120 Precision measurement microphone
  • Vibrations Meter
  • Vibrations FFT Analyzer
  • Custom made ground vibrations prediction modules for blast noise (Mining Projects)

Noise predictive analysis – Sound Plan

Our Noise & Vibrations Laboratory is equipped with Sound propagation predictive analysis software – ‘Sound Plan’. Noise Modelling predictive analysis is done for every EIA project using the Software tool called “Sound Plan” which predicts the Noise Map generated due to the sources present at the project site, and predicts the Noise Levels at various receiver points due to the sources present at the project site.

To analyze the Noise Map of the project site, first, the geometrically coordinated Google Earth images of the Project site were imported into the software. Various Sources of noise were added with their approximate Sound Pressure Levels, and the “Receiver points” were added at various locations where Noise Monitoring was conducted.

“Sound Plan” generates the Noise Map with colored pattern isoplates, which indicate whether or not the SPL in that particular region is above the limits mentioned by CPCB or not. If the Limit for Sound Pressure Level indicated by CPCB for that particular area is 75 dB during the day, and if the predicted SPL is below that, the Noise Map will show Green color for that area. But if the SPL is above the “user set” allowable limit, the same will be shown in Red color depending upon the Difference between then Predicted SPL and the Allowable SPL, and the “Conflict” in SPL is mentioned in the table if any conflict is predicted.

Noise maps generated for a couple of projects completed in the past, are provided below for reference:

FFT Analysis

A Sound Pressure Level meter measures only the noise level at a particular time at that location, without providing any information about what are the contributions of the individual frequencies in the overall noise level measured. FFT Analyzer provides information about the contribution of each of the frequency in human audible range.

FFT Analysis is usually done only in critical applications while practically reducing the noise levels of machinery. In EIA related application, FFT Analysis can provide us the important data regarding the very loud sources of noise which may have impact for up to 1 kilometer distance in the surrounding environment, such as Blasting noise at Mining projects, or Boiler safety valve blow off noise etc.

In such cases, if the Baseline Noise data is higher than the the allowable CPCB limits for sound pressure levels in those respective areas, then it becomes critical to analyze if the primary reason for increase in noise levels in the surrounding areas is because of the noise sources related to the project, or due to some localized sources of noise such as Vehicular movement or traffic noise which is not related to the project site under consideration.

As the type of source changes, its frequency spectrum also changes as shown in the example noted below:

  • Blasting Noise – measured at 100 meters distance from blast site, measured at Kothariya Bauxite mines.
  • Mechanized Mining – FFT Spectrum noted at 50 meters distance for Nandana 1 Bauxite mines while earth moving machinery (Excavators, Tractors etc.) along with some diesel engine driven Water removal pumps.

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